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DTSTART:19450814T190000
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END:VTIMEZONE
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20241029T153047Z
DESCRIPTION:Jacob Williams - defense:LOSC in Translation: Or\, The Localiz
 ed Orbital Scaling Correction for Materials in Periodic Boundary Conditio
 ns\n\nAbstract:Density functional theory (DFT) is a powerful\, practical\
 , and widespread method for computing quantum-mechanical properties of mo
 lecules and materials. It has been used in thousands of scientific studie
 s\, and its foundational papers are among the most cited of all time. How
 ever\, DFT suffers systematic flaws including delocalization error\, whic
 h causes (among other inaccuracies) substantially underestimated band gap
 s. The localized orbital scaling correction (LOSC) is a particularly prom
 ising method to correct delocalization error in DFT calculations. LOSC's 
 ability to correct both total energy and orbital energies gives it the po
 tential to correct delocalization error in both molecules and materials w
 ith the same theory. Previous work in the Yang group has established its 
 success for molecules.\n\nIn this work\, we extend LOSC to semiconducting
  and insulating materials. We introduce dually localized Wannier function
 s\, which are localized in space while retaining spectral (energy) inform
 ation. Correcting delocalization error in materials requires calculating 
 electronic screening\, which we compute in three ways: attenuating the Co
 ulomb repulsion\, a method we call sLOSC\; with accurate\, system-depende
 nt linear response (lrLOSC)\; and with orbital-free linear response (olLO
 SC). All three methods predict better band gaps than DFT alone\; lrLOSC i
 s particularly accurate\, with a mean absolute error of 0.29 eV on our te
 st set. Both lrLOSC and olLOSC also correct delocalization error in molec
 ules.\n\nFinally\, we investigate the possibility that molecular vibratio
 ns transmit information about olfactant molecules to smell receptors. We 
 perform computational infrared spectroscopy on the human olfactory recept
 or OR51E2 bound to propionate (C2H5COO- ). Comparing vibrational energy f
 luctuations due to the thermal environment to the changes induced by subs
 tituting hydrogen isotopes in propionate\, we find that only high-frequen
 cy vibrational modes are likely to be distinguishable.\n\n10/30/24\n1:00p
 m \nFFSC 3232
DURATION:PT1H
DTSTAMP:20241029T154354Z
DTSTART;TZID=America/New_York:20241030T130000
LAST-MODIFIED:20241029T154354Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Jacob Williams- Defense: LOSC in Translation: Or\, The Localized O
 rbital Scaling Correction for Materials in Periodic Boundary Conditions
UID:CAL-8a000483-92c3adf6-0192-d8e6a642-00003683demobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-STUDENT-CONTACT;X-BEDEWORK-PARAM-EMAIL=chem-office@duke.edu:Che
 m Office
X-BEDEWORK-SPEAKER:Jacob Williams
X-BEDEWORK-IMAGE-X1:0
X-BEDEWORK-IMAGE-Y1:15
X-BEDEWORK-IMAGE-X2:530
X-BEDEWORK-IMAGE-Y2:368.3333333333333
X-BEDEWORK-IMAGE-CROP-WIDTH:530
X-BEDEWORK-IMAGE-CROP-HEIGHT:353.3333333333333
X-BEDEWORK-IMAGE-ALT-TEXT:Jacob Williams
X-BEDEWORK-SUBMITTEDBY:lao26 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
X-BEDEWORK-IMAGE:/public/Images/Jacob Williams_20241029032834PM.jpg
X-BEDEWORK-THUMB-IMAGE:/public/Images/Jacob Williams_20241029032834PM-thum
 b.png
END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20241030T173725Z
DESCRIPTION:Understanding the interactions between light and matter is cri
 tical for developing systems for sensing\, photovoltaics and harvesting s
 olar energy\, as these systems rely on absorbing light\, and converting i
 t to energy or information. Developing a practical understanding of light
 -matter interactions requires knowledge of photoexcitation\, the process 
 of absorbing light\, and charge transfer reactions\, the process of charg
 e moving through a material. Materials with highly tunable electronic str
 uctures are of particular interest for developing devices based on light-
 matter interactions\, as the way these materials absorb light\, and trans
 fer charge can be rigorously controlled. However\, the mechanisms of char
 ge transfer and photoexcitation can vary wildly from material to material
 \, especially in those with tunable electronic properties. Therefore\, id
 entifying the mechanisms of photoexcitation and charge transfer in system
 s with rigorously controlled electronic properties is critical for the de
 velopment of new technologies based on light-matter interactions. This di
 ssertation investigates the mechanisms by which light and charge move thr
 ough well-defined nanohybrid superstructures with highly tunable electron
 ic structures based on semiconducting polymers and both metallic and semi
 conducting single-walled carbon nanotubes (SWNTs) with homogeneous electr
 onic structures. First\, exploring noncovalent interactions which can mod
 ulate the E-k dispersion near the Fermi level of a low-dimensional nanosc
 ale conductor\, showing that low energy band gaps may be opened in metall
 ic carbon nanotubes through polymer wrapping of the SWNT surface at fixed
  helical periodicity. Employing ultrafast pump-probe transient absorption
  spectroscopy\, this work then characterized the nature of (i) interactio
 ns between excitons and charges which enable multiple types of charge tra
 nsfer reactions in polymer-wrapped SWNT superstructures and (ii) the driv
 ing force dependence of newly uncovered charge transfer reactions involvi
 ng SWNT excitons. These investigations discerned that because SWNT excito
 ns have substantial excited-state reduction (1E−/*) and excited-state oxi
 dation (1E*/+) potentials\, they can drive additional charge transfer rea
 ctions involving initially prepared CS states under experimental conditio
 ns where excess excitons are present\, and further\, these reactions exhi
 bit complex relationships between driving force and rate dependent on the
  distance between charge carriers.
DURATION:PT1H
DTSTAMP:20241030T173725Z
DTSTART;TZID=America/New_York:20241104T130000
LAST-MODIFIED:20241030T173725Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Jamie Alatis - Defense: Mechanisms of Charge Transfer Reactions in
  Rylene-Based Polymer-Wrapped Single-Walled Carbon Nanotube Superstructur
 es
UID:CAL-8a000483-92c3adf6-0192-de80f468-000069c9demobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-SPEAKER:Jamie Alatis
X-BEDEWORK-STUDENT-CONTACT;X-BEDEWORK-PARAM-EMAIL=chem-office@duke.edu:Che
 m Office
X-BEDEWORK-IMAGE-X1:0
X-BEDEWORK-IMAGE-Y1:0
X-BEDEWORK-IMAGE-X2:557
X-BEDEWORK-IMAGE-Y2:371.3333333333333
X-BEDEWORK-IMAGE-CROP-WIDTH:557
X-BEDEWORK-IMAGE-CROP-HEIGHT:371.3333333333333
X-BEDEWORK-IMAGE-ALT-TEXT:Jamie Alatis
X-BEDEWORK-SUBMITTEDBY:lao26 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
X-BEDEWORK-IMAGE:/public/Images/Jamie Alatis_20241030053725PM.jpg
X-BEDEWORK-THUMB-IMAGE:/public/Images/Jamie Alatis_20241030053725PM-thumb.
 png
END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20241030T180236Z
DESCRIPTION:Anti-infectives are critical tools for the treatment of infect
 ious diseases\, but the use of anti-infectives drives resistance. Despite
  this\, few new anti-infectives are entering into therapeutic use\, meani
 ng that anti-infective resistance is outpacing development. The developme
 nt of new anti-infectives is necessary to address this. Antibiotics and a
 ntifungals are of special interest\, owing to the broad emergence of anti
 biotic resistance and the limited tools available for antifungal treatmen
 ts. To combat resistance\, we developed a new class of antifungals target
 ing calcineurin\, a phosphatase enzyme responsible for fungal stress resp
 onse and survival in human infections. Though the inhibition of calcineur
 in is potently fungicidal\, calcineurin has been precluded as an antifung
 al target due to conservation of calcineurin in humans\, where calcineuri
 n is responsible for immune activation. There are\, however\, structural 
 differences between human and fungal calcineurin that may be exploited to
  design calcineurin inhibitors that maintain antifungal activity while ab
 olishing immunosuppression. Modification of FK520\, a natural product tha
 t inhibits both human and fungal calcineurin\, may enable selective antif
 ungal activity. This work details the synthesis of a series of derivative
 s of FK520 with antifungal activity and reduced immunosuppressive activit
 y and identified C22 and C32 modified compounds that maintain antifungal 
 activity against Candida albicans and Cryptococcus neoformans in vitro wh
 ile reducing in vivo immunosuppression. In doing so\, this work advances 
 the development of calcineurin as a target for antifungal development. \n
 Gram-negative bacterial infections are especially difficult to treat owin
 g to their outer membrane\, which limits the permeation of antibiotics in
 to the cell. The anchor of the lipopolysaccharide layer of the outer memb
 rane is produced by the Raetz pathway\; the phosphatase enzyme LpxH of th
 e Raetz pathway is of particular interest for antibiotic development as i
 ts inhibition both disrupts the bacterial outer membrane and leads to the
  accumulation of toxic glucosamines\, a dual mechanism of bactericidal ac
 tivity. This work details the development\, optimization\, characterizati
 on\, and biological evaluation of a series of LpxH inhibitors\, focusing 
 on four areas of improvement and has led to the development of LpxH inhib
 itors with in vitro activity against Klebsiella pneumoniae and Escherichi
 a coli and sub-nanomolar inhibition of LpxH.
DURATION:PT1H
DTSTAMP:20241104T165556Z
DTSTART;TZID=America/New_York:20241108T140000
LAST-MODIFIED:20241104T165556Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Austin Dome: Defense- Development of Anti-Infectives Targeting Bac
 terial LpxH or Fungal FKBP12-Calcineurin
UID:CAL-8a000483-92c3adf6-0192-de98033a-00006a8bdemobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-STUDENT-CONTACT;X-BEDEWORK-PARAM-EMAIL=chem-office@duke.edu:Che
 m Office
X-BEDEWORK-SPEAKER:Austin Dome
X-BEDEWORK-IMAGE-X1:0
X-BEDEWORK-IMAGE-Y1:13
X-BEDEWORK-IMAGE-X2:530
X-BEDEWORK-IMAGE-Y2:366.3333333333333
X-BEDEWORK-IMAGE-CROP-WIDTH:530
X-BEDEWORK-IMAGE-CROP-HEIGHT:353.3333333333333
X-BEDEWORK-IMAGE-ALT-TEXT:Austin Dome
X-BEDEWORK-SUBMITTEDBY:lao26 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
X-BEDEWORK-IMAGE:/public/Images/patrick dome_20241030060237PM.jpg
X-BEDEWORK-THUMB-IMAGE:/public/Images/patrick dome_20241030060237PM-thumb.
 png
END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20241106T205318Z
DESCRIPTION:"Manipulating Spin States\, Spin Transmission\, and Charge Tra
 nsfer Using Optical and Electrical Fields"\n\nSpin manipulation is fundam
 ental for molecular spintronics and many quantum devices\, and provides n
 ew opportunities for computation\, communication\, and sensing. Manipulat
 ing spins with methodologies other than modulation of an external magneti
 c field provides opportunities for further device miniaturization\, with 
 applied optical and electrical fields offering possible approaches. For s
 pintronic and quantum applications\, molecules feature advantages includi
 ng the possibility to highly polarize spins at room temperature\, and fac
 ile mass production at high fidelity.\nThis dissertation focuses on manip
 ulating electron spin and charge distributions in molecules using optical
  and electrical fields. Key research accomplishments include: (i) a spect
 roscopical and computational investigation of the impact from expansive c
 onjugation on the excited-state dynamical properties of stable radicals\;
  (ii) the design and synthesis of chiral low-resistance molecular wires w
 ith a tripodal anchoring ligand that enforces an ideal orthogonal molecul
 ar organization and optimally dense packing of self-assembled monolayers 
 (SAMs) formed on metal and semiconductor surfaces\, and studying the gene
 ration and propagation of spin-polarized currents enabled by the chiralit
 y-induced spin selectivity (CISS) effect\; and (iii) determining the driv
 ing force dependence of ultrafast intramolecular proton-coupled electron 
 transfer (PCET) and establishing new mechanistic insights for such reacti
 ons. Spin state generation\, spin transmission\, and electron transfer in
 duced by optical and electrical fields were interrogated on a wide range 
 of molecular systems. Structure-function relationships revealed by this d
 issertation will facilitate molecular designs with exceptional optical\, 
 electrical\, and magnetic properties for electronic\, spintronic\, and QI
 S applications.
DURATION:PT1H
DTSTAMP:20241114T164854Z
DTSTART;TZID=America/New_York:20241115T140000
LAST-MODIFIED:20241114T164854Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Jiaqi Zhu- defense: "Manipulating Spin States\, Spin Transmission\
 , and Charge Transfer Using Optical and Electrical Fields"
UID:CAL-8a000483-92c3adf6-0193-0340cd9d-00004243demobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-STUDENT-CONTACT;X-BEDEWORK-PARAM-EMAIL=chem-office@duke.edu:Che
 m Office
X-BEDEWORK-SPEAKER:Jiaqi Zhu
X-BEDEWORK-IMAGE-X1:0
X-BEDEWORK-IMAGE-Y1:0
X-BEDEWORK-IMAGE-X2:1622
X-BEDEWORK-IMAGE-Y2:1081.3333333333333
X-BEDEWORK-IMAGE-CROP-WIDTH:1622
X-BEDEWORK-IMAGE-CROP-HEIGHT:1081.3333333333333
X-BEDEWORK-IMAGE-ALT-TEXT:Jiaqi Zhu
X-BEDEWORK-SUBMITTEDBY:lao26 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
X-BEDEWORK-IMAGE:/public/Images/Jiaqi Zhu_20241106085318PM.png
X-BEDEWORK-THUMB-IMAGE:/public/Images/Jiaqi Zhu_20241106085318PM-thumb.png
 
END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20241115T161829Z
DESCRIPTION:"Interrogating the Small Molecule Modulation of Viral RNA Seco
 ndary Structures"\nRNA viruses have been the cause of viral outbreaks\, e
 pidemics and pandemics worldwide. However\, many viruses do not have spec
 ific antiviral treatments. As such\, there is an imperative need for the 
 development of viral therapeutics. The recent advances in our understandi
 ng of RNA have shown that RNA plays a critical role in various disease st
 ates and has properties that make it an attractive potential therapeutic 
 target. One property of interest is the structure-function relationship o
 f RNA\, where the structure and dynamics of viral RNA has been found to s
 ignificantly impact biological function. Small molecules can potentially 
 be used to modulate the biological function of viral RNA by exploiting it
 s structure-function relationship. However\, the impact small molecules h
 ave on functional\, viral RNA secondary structures has been underexplored
 . \n	RNA viruses contain a variety of different RNA secondary structures 
 that have been found to have biological function. Therefore\, we used the
  functional RNA secondary structures found in different RNA viruses and t
 wo different methods\, Förster energy transfer resonance (FRET) and fluor
 escence indicator displacement (FID)\, to investigate small molecule bind
 ing to viral RNA secondary structures and the impact small molecules have
  on their dynamics. High-throughput screening was used to identify small 
 molecules that bind to or induced conformational change in viral RNA targ
 ets containing the bulge and three-way junction structural motif. Additio
 nally\, computational analysis was used to determine the cheminformatic p
 roperties that were important for the interaction. The computational anal
 ysis revealed that cheminformatic properties such as surface area and the
  number of hydrogen bond donors were important for binding to viral RNA t
 argets with different RNA secondary structures\, and for prompting confor
 mational changes in viral RNA switches. The findings from this work furth
 ered our understanding of viral RNA secondary structures and has the pote
 ntial to aid in the development of novel antiviral treatments.
DURATION:PT1H
DTSTAMP:20241115T161829Z
DTSTART;TZID=America/New_York:20241118T130000
LAST-MODIFIED:20241115T161829Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Antonia Bruce: Defense- "Interrogating the Small Molecule Modulati
 on of Viral RNA Secondary Structures"
UID:CAL-8a000483-92c3adf6-0193-309e6fa0-00003aaddemobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-SPEAKER:Antonia Bruce
X-BEDEWORK-STUDENT-CONTACT;X-BEDEWORK-PARAM-EMAIL=chem-office@duke.edu:Che
 m Office
X-BEDEWORK-SUBMITTEDBY:lao26 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20241107T185413Z
DESCRIPTION:Characterization of Mouse Model of Aging  and Alzheimer's Dise
 ase using Protein Stability Measurements\n\nA recently developed suite of
  mass spectrometry-based proteomic methods allows for the large-scale eva
 luation of protein folding stability. These techniques employ chemical or
  thermal denaturation approaches (such as SPROX and TPP) as well as prote
 olysis strategies (including DARTS\, LiP\, and PP) to assess protein stab
 ility. While these methods have been proven effective for protein target 
 discovery\, there is still limited understanding of the relative strength
 s and weaknesses of each technique when it comes to characterizing biolog
 ical phenotypes. Therefore\, in this dissertation\, it first presents a c
 omparative study of SPROX\, TPP\, and LiP in characterizing different phe
 notypes to fully evaluate these techniques.  These methods were then be u
 sed to explores the development and progression of AD in the mouse model.
  Both female and male mouse models were used to explore the similarities 
 and differences in AD progression across genders.  The ultimate goal of t
 his work is to identify novel disease biomarkers and potential drug targe
 ts\, as well as elucidating molecular mechanisms underlying stability cha
 nge.
DURATION:PT1H
DTSTAMP:20241107T185413Z
DTSTART;TZID=America/New_York:20241119T130000
LAST-MODIFIED:20241107T185413Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Yun Tang- defense: "Characterization of Mouse Model of Aging  and 
 Alzheimer’s Disease using Protein Stability Measurements
UID:CAL-8a000483-92c3adf6-0193-07fa2490-000057e8demobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-SPEAKER:Yun Tang
X-BEDEWORK-STUDENT-CONTACT;X-BEDEWORK-PARAM-EMAIL=chem-office@duke.edu:Che
 m Office
X-BEDEWORK-IMAGE-X1:0
X-BEDEWORK-IMAGE-Y1:867
X-BEDEWORK-IMAGE-X2:3063
X-BEDEWORK-IMAGE-Y2:2909
X-BEDEWORK-IMAGE-CROP-WIDTH:3063
X-BEDEWORK-IMAGE-CROP-HEIGHT:2042
X-BEDEWORK-IMAGE-ALT-TEXT:Yun Tang
X-BEDEWORK-SUBMITTEDBY:lao26 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
X-BEDEWORK-IMAGE:/public/Images/Yun Tang_20241107065413PM.jpg
X-BEDEWORK-THUMB-IMAGE:/public/Images/Yun Tang_20241107065413PM-thumb.png
END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20250318T174003Z
DESCRIPTION:Gabriella Krisanic of Becker Lab will sit their prelim at 3:00
  pm in FFSC 3232
DURATION:PT1H30M
DTSTAMP:20250318T184954Z
DTSTART;TZID=America/New_York:20250319T150000
LAST-MODIFIED:20250318T184954Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Prelim Exam: Gabriella Krisanic
UID:CAL-8a000483-92c3adf6-0195-aa8b15d6-0000444ddemobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-STUDENT-CONTACT;X-BEDEWORK-PARAM-EMAIL=chem-office@duke.edu:Che
 mistry Office
X-BEDEWORK-SUBMITTEDBY:bsg25 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20250318T174003Z
DESCRIPTION:Yang Shen of Yang Lab will sit their prelim at 2:00 pm in FFSC
  3232
DURATION:PT1H30M
DTSTAMP:20250318T180436Z
DTSTART;TZID=America/New_York:20250324T093000
LAST-MODIFIED:20250318T180436Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Prelim Exam: Yang Shen
UID:CAL-8a000483-92c3adf6-0195-aa6dca83-00003d7fdemobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-STUDENT-CONTACT;X-BEDEWORK-PARAM-EMAIL=chem-office@duke.edu:Che
 mistry Office
X-BEDEWORK-SUBMITTEDBY:bsg25 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20250318T174003Z
DESCRIPTION:Natalie Labbe of Fitzgerald Lab will sit their prelim at 9:00 
 am in FFSC 3232.
DURATION:PT1H30M
DTSTAMP:20250318T185510Z
DTSTART;TZID=America/New_York:20250326T090000
LAST-MODIFIED:20250318T185510Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Prelim Exam: Natalie Labbe
UID:CAL-8a000483-92c3adf6-0195-aa9c1427-000049fademobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-STUDENT-CONTACT;X-BEDEWORK-PARAM-EMAIL=chem-office@duke.edu:Che
 mistry Office
X-BEDEWORK-SUBMITTEDBY:bsg25 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20250310T162152Z
DESCRIPTION:"Plasmonic Catalysis: Is There a Limit in the Total Light Enha
 ncement?"
DURATION:PT1H
DTSTAMP:20250310T162152Z
DTSTART;TZID=America/New_York:20250328T140000
LAST-MODIFIED:20250310T162152Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Chemistry Defense: Dora Geng
UID:CAL-8a000483-92c3adf6-0195-80dcde32-00001156demobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-SPEAKER:Dora Geng
X-BEDEWORK-STUDENT-CONTACT;X-BEDEWORK-PARAM-EMAIL=lynn.oneill@duke.edu:Lyn
 n O'Neill- DGSA
X-BEDEWORK-IMAGE-X1:0
X-BEDEWORK-IMAGE-Y1:256
X-BEDEWORK-IMAGE-X2:2000
X-BEDEWORK-IMAGE-Y2:1589.3333333333333
X-BEDEWORK-IMAGE-CROP-WIDTH:2000
X-BEDEWORK-IMAGE-CROP-HEIGHT:1333.3333333333333
X-BEDEWORK-IMAGE-ALT-TEXT:Dora Geng
X-BEDEWORK-SUBMITTEDBY:lao26 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
X-BEDEWORK-IMAGE:/public/Images/DG_20250310042152PM.jpg
X-BEDEWORK-THUMB-IMAGE:/public/Images/DG_20250310042152PM-thumb.png
END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20250318T174003Z
DESCRIPTION:Conner Soderstedt of Moreno-Hernandez Lab will sit their preli
 m at 1:30 pm in FFSC 3232
DURATION:PT1H30M
DTSTAMP:20250318T192628Z
DTSTART;TZID=America/New_York:20250404T133000
LAST-MODIFIED:20250318T192628Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Prelim Exam: Conner Soderstedt
UID:CAL-8a000483-92c3adf6-0195-aab8bf2d-0000512fdemobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-STUDENT-CONTACT;X-BEDEWORK-PARAM-EMAIL=chem-office@duke.edu:Che
 mistry Office
X-BEDEWORK-SUBMITTEDBY:bsg25 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20250318T174003Z
DESCRIPTION:Mackenzie Smith of Franz Lab will sit their prelim at 9:00 am 
 in FFSC 3232
DURATION:PT1H30M
DTSTAMP:20250318T180550Z
DTSTART;TZID=America/New_York:20250409T090000
LAST-MODIFIED:20250318T180550Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Prelim Exam: Mackenzie Smith
UID:CAL-8a000483-92c3adf6-0195-aa6eebef-00003de1demobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-STUDENT-CONTACT;X-BEDEWORK-PARAM-EMAIL=chem-office@duke.edu:Che
 mistry Office
X-BEDEWORK-SUBMITTEDBY:bsg25 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20250318T174003Z
DESCRIPTION:Gaini Ibrasheva of Derbyshire Lab will sit their prelim at 1:3
 0 pm in FFSC 3232
DURATION:PT1H30M
DTSTAMP:20250318T184250Z
DTSTART;TZID=America/New_York:20250409T133000
LAST-MODIFIED:20250318T184250Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Prelim Exam: Gaini Ibrasheva
UID:CAL-8a000483-92c3adf6-0195-aa90ca68-00004754demobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-STUDENT-CONTACT;X-BEDEWORK-PARAM-EMAIL=chem-office@duke.edu:Che
 mistry Office
X-BEDEWORK-SUBMITTEDBY:bsg25 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20250318T174003Z
DESCRIPTION:Sarah Seay of Franz Lab will sit their prelim at 2:00 pm in FF
 SC 3232.
DURATION:PT1H30M
DTSTAMP:20250318T190341Z
DTSTART;TZID=America/New_York:20250410T140000
LAST-MODIFIED:20250318T190341Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Prelim Exam: Sarah Seay
UID:CAL-8a000483-92c3adf6-0195-aaa1368f-00004abcdemobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-STUDENT-CONTACT;X-BEDEWORK-PARAM-EMAIL=chem-office@duke.edu:Che
 mistry Office
X-BEDEWORK-SUBMITTEDBY:bsg25 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20250318T174003Z
DESCRIPTION:Anthony Mack of Craig Lab will sit their prelim at 3:30 am in 
 FFSC 3232.
DURATION:PT1H30M
DTSTAMP:20250326T194759Z
DTSTART;TZID=America/New_York:20250430T153000
LAST-MODIFIED:20250326T194759Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Prelim Exam: Anthony Mack
UID:CAL-8a000483-92c3adf6-0195-d3ff4ec9-00001455demobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-STUDENT-CONTACT;X-BEDEWORK-PARAM-EMAIL=chem-office@duke.edu:Che
 mistry Office
X-BEDEWORK-SUBMITTEDBY:bsg25 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20250318T174003Z
DESCRIPTION:Hoseong Ryu of Hong Lab will sit their prelim at 9:00 am in FF
 SC 3232.
DURATION:PT1H30M
DTSTAMP:20250326T194909Z
DTSTART;TZID=America/New_York:20250507T090000
LAST-MODIFIED:20250326T194909Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Prelim Exam: Hoseong Ryu
UID:CAL-8a000483-92c3adf6-0195-d400627d-000014b7demobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-STUDENT-CONTACT;X-BEDEWORK-PARAM-EMAIL=chem-office@duke.edu:Che
 mistry Office
X-BEDEWORK-SUBMITTEDBY:bsg25 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20250516T150343Z
DESCRIPTION:Grace Yao\n\nNetwork Toughening Strategies: Interplay of Mecha
 nophore Reactivity\, Polymer Chemistry and Network Topology\n\nWhen polym
 er materials fracture\, chemical bonds break\, revealing a unique molecul
 ar perspective on network fracture mechanism. This view highlights critic
 al molecular details of network fracture - such as strand extension and b
 ond scission - that extend beyond conventional macroscopic engineering ap
 proaches. This dissertation aims to establish correlations between the mi
 croscopic force-coupled reactivity and the macroscopic mechanical propert
 ies of polymer networks. Advancements in polymer mechanochemistry have en
 abled the mechanical studies of delicate mechanophores in single chain po
 lymers through pulsed ultrasound and single molecule force spectroscopy. 
 By strategically incorporating these mechanochemically labile units as cr
 osslinks in side-crosslinked networks\, their mechanochemical reactivity 
 has been shown to dictate crack propagation pathways and consequently enh
 ance materials toughness. This dissertation primarily explores three dist
 inct crosslinking strategies for toughening polymer networks: metal-ligan
 d crosslinking\, facile carbosilane analogs and remendable Diels-Alder ad
 ducts. Our findings demonstrate that mechanically weak linkers can effect
 ively reinforce polymer materials across various polymeric systems. We ch
 aracterized the mechanochemical reactivities of these crosslinking candid
 ates and demonstrated their effectiveness in strengthening bulk materials
 . Furthermore\, we examined the interplay between covalent reactivity and
  polymer intermolecular interactions\, in the context of two effects: ent
 anglements and viscous dissipation. These insights provide a framework fo
 r designing more resilient polymer materials with tailored mechanical pro
 perties.
DURATION:PT1H
DTSTAMP:20250616T162154Z
DTSTART;TZID=America/New_York:20250618T130000
LAST-MODIFIED:20250616T162154Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Defense: Grace Yao- Network Toughening Strategies: Interplay of Me
 chanophore Reactivity\, Polymer Chemistry and Network Topology
UID:CAL-8a00048b-968cb292-0196-d99f64f7-00004298demobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-SPEAKER:Grace Yao
X-BEDEWORK-IMAGE-X1:0
X-BEDEWORK-IMAGE-Y1:16
X-BEDEWORK-IMAGE-X2:530
X-BEDEWORK-IMAGE-Y2:369.3333333333333
X-BEDEWORK-IMAGE-CROP-WIDTH:530
X-BEDEWORK-IMAGE-CROP-HEIGHT:353.3333333333333
X-BEDEWORK-IMAGE-ALT-TEXT:GY
X-BEDEWORK-SUBMITTEDBY:lao26 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
X-BEDEWORK-IMAGE:/public/Images/GY_20250516030343PM.jpg
X-BEDEWORK-THUMB-IMAGE:/public/Images/GY_20250516030343PM-thumb.png
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Research
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20250701T125947Z
DESCRIPTION:As chemistry moves further into the realm of ultrafast and com
 plex molecular processes\, understanding how quantum effects drive chemic
 al reactions such as electron and energy transfer becomes increasingly im
 portant. In my dissertation\, I develop and apply new computational metho
 ds that make it possible to simulate quantum dynamics in realistic chemic
 al systems\, including their interactions with complex environments. By a
 dvancing numerical tools such as tensor network algorithms\, path integra
 l (pathway) resummation\, and quantum master equation\, my work enables a
 ccurate modeling of quantum coherence\, entanglement\, and environmental 
 influences in both small molecules and large assemblies. I demonstrate th
 ese methods through applications like simulating electron and energy tran
 sfer in multi-acceptor systems\, which are important in materials science
 \, catalysis\, and biological systems. The results reveal how quantum eff
 ects and molecular structure can combine to enhance or control chemical p
 rocesses. These computational advances bring theory and experiment closer
  together\, providing chemists with new ways to predict\, interpret\, and
  design complex chemical systems.
DURATION:PT1H
DTSTAMP:20250709T171517Z
DTSTART;TZID=America/New_York:20250709T140000
LAST-MODIFIED:20250709T171517Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Defense: Hanggai Nuomin-Numerical Methods for Quantum Dynamics and
  their Applications in Chemistry
UID:CAL-8a00ec8b-979413b9-0197-c612763f-00000973demobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Research:/user/public-user/T
 opics/Research
X-BEDEWORK-IMAGE-X1:0
X-BEDEWORK-IMAGE-Y1:352
X-BEDEWORK-IMAGE-X2:873
X-BEDEWORK-IMAGE-Y2:934
X-BEDEWORK-IMAGE-CROP-WIDTH:873
X-BEDEWORK-IMAGE-CROP-HEIGHT:582
X-BEDEWORK-IMAGE-ALT-TEXT:HN
X-BEDEWORK-SUBMITTEDBY:bsg25 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
X-BEDEWORK-IMAGE:/public/Images/hanggai-3-1_20250701125947PM.png
X-BEDEWORK-THUMB-IMAGE:/public/Images/hanggai-3-1_20250701125947PM-thumb.p
 ng
END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Research
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20250707T153021Z
DESCRIPTION:Non-precious metal nitrides for efficient electrochemical wate
 r splitting\n\nGrowing global energy demands coupled with the detrimental
  environmental impacts of fossil fuel combustion highlight an urgent need
  to develop sustainable energy technologies. Electrochemical water splitt
 ing stands as a promising approach to convert renewable energy sources to
  hydrogen\, a clean and carbon free energy carrier\, for applications and
  energy transportation. However\, the process requires efficient\, durabl
 e\, and cost-effective electrocatalysts that are still being developed. N
 on-precious metal nitrides have recently garnered significant attention d
 ue to their excellent catalytic properties\, low cost\, and high stabilit
 y. This thesis focuses on several important aspects related to this catal
 yst family. Chapter 1 discusses recent advancements and fundamental metho
 dologies in electrocatalyst research relevant to water splitting applicat
 ions. Chapter 2 describes the system involving the development of nitrida
 ted NiMoO₄ nanoneedles as a catalyst for the hydrogen evolution reaction 
 (HER). The optimized material shows strong HER performance in alkaline so
 lution\, with low overpotentials\, favorable Tafel slopes\, and stable lo
 ng-term operation. Notably\, the catalyst reaches a high current density 
 of 350 mA/cm² at an overpotential of only -10 mV\, showing its potential 
 for practical hydrogen production. Chapter 3 focuses on Co₃Mo₃N nanoparti
 cles used as a photo-thermal electrocatalyst for the oxygen evolution rea
 ction (OER) and its improved performance under both light and heat. Elect
 rochemical testing shows that Co₃Mo₃N catalyst has a significant photo-th
 ermal enhancement in OER. For example\, under 2 watts of blue light\, it 
 achieves a 150% increase in current density at an overpotential of 0.34 V
 . The outstanding effect of photo-thermal enhancement of the catalyst ind
 icates its potential in light-assisted water-splitting technologies. Over
 all\, this research supports the development of affordable\, high-perform
 ance catalytic materials for clean energy applications.
DURATION:PT1H
DTSTAMP:20250707T154020Z
DTSTART;TZID=America/New_York:20250711T100000
LAST-MODIFIED:20250707T154020Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Chemistry Defense: Yufeng Chen: Non-precious metal nitrides for ef
 ficient electrochemical water splitting
UID:CAL-8a00ec8b-979413b9-0197-e58274ee-00003cf5demobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Research:/user/public-user/T
 opics/Research
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-STUDENT-CONTACT;X-BEDEWORK-PARAM-EMAIL=chem-office@duke.edu:che
 m admin office
X-BEDEWORK-SPEAKER:Yufeng Chen
X-BEDEWORK-IMAGE-X1:415
X-BEDEWORK-IMAGE-Y1:44
X-BEDEWORK-IMAGE-X2:1572
X-BEDEWORK-IMAGE-Y2:815.3333333333334
X-BEDEWORK-IMAGE-CROP-WIDTH:1157
X-BEDEWORK-IMAGE-CROP-HEIGHT:771.3333333333334
X-BEDEWORK-IMAGE-ALT-TEXT:Y. Chen
X-BEDEWORK-SUBMITTEDBY:lao26 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
X-BEDEWORK-IMAGE:/public/Images/Y. C._20250707034021PM.png
X-BEDEWORK-THUMB-IMAGE:/public/Images/Y. C._20250707034021PM-thumb.png
END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Research
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20250620T190613Z
DESCRIPTION:Structure-function relations and kinetic principles underlying
  multiscale electron transfer in biology\n\nElectron transfer (ET) underl
 ies fundamental biological processes such as respiration\, photosynthesis
 \, redox catalysis\, and cellular signaling. This work investigates the s
 tructure-function relations and kinetic principles governing efficient an
 d controlled ET across multiscales in biological systems. Two major resea
 rch directions are explored: free energy transduction by nanoscale molecu
 lar machines and long-range extracellular ET in protein-based nanowires. 
 The first research direction focuses on understanding free energy transdu
 ction in electron bifurcation (EB)\, a mechanism that couples exergonic a
 nd endergonic ET reactions. We found that many-particle correlations are 
 essential to accurately describe EB\, and\, more broadly\, any process in
 volving free energy transduction. To better represent biological conditio
 ns such as spatial confinement and limited redox carrier pools\, we devel
 oped an open many-particle system model that treats redox pools as finite
  narrow-band reservoirs. Using this framework\, we identified that invert
 ed redox potentials at the bifurcating site reduces slippage in the pre-s
 teady-state regime. The second direction examines electron transport thro
 ugh bacterial nanowires\, which enable extracellular ET by forming conduc
 tive protein filaments. These nanowires exhibit anti-Arrhenius behavior\,
  with conductivity decreasing as temperature increases\, a phenomenon inc
 onsistent with conventional thermally activated hopping mechanisms. Our s
 imulations show that electrostatic effects on the ET parameters alone can
 not account for the anti-Arrhenius behavior. Instead\, the physical origi
 n of anti-Arrhenius transport lies in other factors\, pointing to a more 
 complex structural or dynamical basis for the observed temperature depend
 ence. Together\, these studies provide new insights into how biological E
 T systems achieve efficiency and control\, emphasizing the role of physic
 al constraints\, correlations\, and structural dynamics.
DURATION:PT1H
DTSTAMP:20250620T190839Z
DTSTART;TZID=America/New_York:20250711T140000
LAST-MODIFIED:20250620T190839Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Defense: Kiriko. Terai: Structure-function relations and kinetic p
 rinciples underlying multiscale electron transfer in biology
UID:CAL-8a00f286-97700737-0197-8ebbfcfe-00004402demobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Research:/user/public-user/T
 opics/Research
X-BEDEWORK-STUDENT-CONTACT;X-BEDEWORK-PARAM-EMAIL=chem-office@duke.edu:Che
 mistry Office Admin
X-BEDEWORK-SUBMITTEDBY:lao26 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
X-BEDEWORK-IMAGE-X1:286
X-BEDEWORK-IMAGE-Y1:0
X-BEDEWORK-IMAGE-X2:1763.5
X-BEDEWORK-IMAGE-Y2:985
X-BEDEWORK-IMAGE-CROP-WIDTH:1477.5
X-BEDEWORK-IMAGE-CROP-HEIGHT:985
X-BEDEWORK-IMAGE-ALT-TEXT:KT
X-BEDEWORK-IMAGE:/public/Images/ilcjknfn_20250620070839PM.png
X-BEDEWORK-THUMB-IMAGE:/public/Images/ilcjknfn_20250620070839PM-thumb.png
END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Research
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=8a028ad1-899cba17-0189-d5f761f7-0000488a:O'Neill\, 
 Lynn
CREATED:20250711T154540Z
DESCRIPTION:Anharmonic lattice dynamics underlie many key material propert
 ies\, including thermal transport\, ferroelectricity\, and structural pha
 se transitions. Understanding the couplings between phonons\, electrons\,
  and other microscopic degrees of freedom is essential for the design of 
 next-generation energy materials. This research combines inelastic neutro
 n and X-ray scattering with first-principles simulations to explore phono
 n anharmonicity and its role in energy transport across two representativ
 e systems: elemental bismuth and halide perovskites.\n\nIn bismuth\, we i
 nvestigate the strong temperature-dependent phonon softening and broadeni
 ng driven by anharmonic interactions and electron-phonon coupling. Using 
 inelastic neutron scattering and anharmonic phonon calculations\, we quan
 tify the acoustic phonon energy shifts and lifetimes\, revealing the micr
 oscopic origin of temperature dependence of lattice thermal conductivity 
 and energy dissipation processes.\n\nIn parallel\, we study inorganic and
  hybrid halide perovskites\, including CsSnBr3\, CsPbBr3\, Cs2AgBiBr6\, a
 nd MAPbI3\, which exhibit ultra-soft lattice dynamics and complex structu
 ral phase transitions. Diffuse scattering and phonon measurements uncover
  low-energy soft modes and domain formation linked to octahedral rotation
 s and molecular dynamics. Our results show how anharmonic lattice behavio
 r governs their thermal and optoelectronic properties\, offering insights
  into long carrier lifetimes and low thermal conductivity.\n\nTogether\, 
 these studies demonstrate how experimental and computational tools can jo
 intly reveal the fundamental role of anharmonic phonons in controlling th
 e behavior of quantum and energy-relevant materials.
DURATION:PT2H
DTSTAMP:20250711T154540Z
DTSTART;TZID=America/New_York:20250716T140000
LAST-MODIFIED:20250711T154540Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Defense:Chengjie Mao- Phase transitions\, structural fluctuations 
 and temperature dependent thermal conductivities of energy materials from
  phonon anharmonicty
UID:CAL-8a00ec8b-979413b9-0197-fa29eac2-0000426cdemobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Research:/user/public-user/T
 opics/Research
X-BEDEWORK-IMAGE-X1:179
X-BEDEWORK-IMAGE-Y1:16
X-BEDEWORK-IMAGE-X2:1771
X-BEDEWORK-IMAGE-Y2:1077.3333333333333
X-BEDEWORK-IMAGE-CROP-WIDTH:1592
X-BEDEWORK-IMAGE-CROP-HEIGHT:1061.3333333333333
X-BEDEWORK-IMAGE-ALT-TEXT:CM
X-BEDEWORK-SUBMITTEDBY:bsg25 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
X-BEDEWORK-IMAGE:/public/Images/Admin Office Slides  (3)_20250711034428PM.
 png
X-BEDEWORK-THUMB-IMAGE:/public/Images/Admin Office Slides  (3)_20250711034
 428PM-thumb.png
END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20250923T135748Z
DESCRIPTION:Total Synthesis and Biological Evaluation of 4α\,9α\,10α-Trihy
 droxyguaia-11(13)en-12\,6α-olide \n\nNatural products remain central to t
 herapeutic discovery\, with nearly two-thirds of approved small-molecule 
 drugs derived from or inspired by natural scaffolds. Beyond drug discover
 y\, they have served as valuable chemical probes\, enabling the mapping o
 f biological pathways with precision. Their evolutionary refinement often
  confers remarkable target selectivity\, making them both excellent drug 
 leads and indispensable research tools. Among bioactive motifs\, the α-ex
 o-methylene-γ-butyrolactone (AMGBL) unit is especially notable as an elec
 trophilic handle\, frequently associated with potent anticancer activity.
 \nThis dissertation reports the total synthesis and biological evaluation
  of 4α\,9α\,10α-trihydroxyguaia-11(13)en-12\,6α-olide (1)\, a guaianolide
 -type sesquiterpene lactone containing an AMGBL moiety. Originally isolat
 ed from Anvillea garcinii\, compound 1 was reported to possess potent ant
 ifungal activity. Inspired by its translational potential\, total synthes
 is of compound 1 was pursued to provide a reliable and efficient route en
 abling access to derivatives and chemical probes. A modular synthetic str
 ategy was adopted to assemble the guaianolide 5\,7\,5-tricyclic core to e
 nable downstream structure-activity relationship studies\, with two compl
 ementary routes that differed in the stage of tertiary hydroxyl installat
 ion. Ultimately\, completion of the synthesis provided access to compound
  1 and allowed assignment of its absolute configuration by X-ray crystall
 ography of a key intermediate.\nBiological studies revealed that syntheti
 c 1 lacked antifungal activity against Candida albicans. However\, high-t
 hroughput screening using Profiling Relative Inhibition Simultaneously in
  Mixtures (PRISM) platform revealed promising anticancer activities\, inc
 luding potent inhibition of BT12 atypical teratoid/rhabdoid tumor cells a
 nd broader activity across multiple cancer models.\nTogether\, these stud
 ies present a robust route to the guaianolide scaffold\, establish its pr
 eviously unassigned absolute stereochemistry\, and reveal the anticancer 
 activity of 1. The results identify this scaffold as a promising entry po
 int for the development of ATRT-directed therapeutics and provide a found
 ation for future structure-activity and mechanistic investigations.
DURATION:PT1H
DTSTAMP:20250923T135748Z
DTSTART;TZID=America/New_York:20251006T140000
LAST-MODIFIED:20250923T135748Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Chemistry Defense: Hyejin Lee- Total Synthesis and Biological Eval
 uation of 4α\,9α\,10α-Trihydroxyguaia-11(13)en-12\,6α-olide
UID:CAL-8a00ec8b-979413b9-0199-76ddc1b3-00003f9cdemobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-SPEAKER:Hyejin Lee
X-BEDEWORK-STUDENT-CONTACT;X-BEDEWORK-PARAM-EMAIL=chem-office@duke.edu:Che
 m Admin Office
X-BEDEWORK-IMAGE-X1:0
X-BEDEWORK-IMAGE-Y1:76
X-BEDEWORK-IMAGE-X2:615
X-BEDEWORK-IMAGE-Y2:486
X-BEDEWORK-IMAGE-CROP-WIDTH:615
X-BEDEWORK-IMAGE-CROP-HEIGHT:410
X-BEDEWORK-IMAGE-ALT-TEXT:H.Lee
X-BEDEWORK-SUBMITTEDBY:lao26 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
X-BEDEWORK-IMAGE:/public/Images/Hyejin Lee 2_20250923015748PM.png
X-BEDEWORK-THUMB-IMAGE:/public/Images/Hyejin Lee 2_20250923015748PM-thumb.
 png
END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20251022T155154Z
DESCRIPTION:Development of DART (Drugs Acutely Restricted by Tethering) Pr
 obes for Targeting Opioid Receptors and Voltage-Gated Sodium Channels\n\n
 \n\nThe brain\, comprising billions of neurons and glial cells\, forms in
 tricate networks that coordinate diverse functions such as movement\, emo
 tion\, and memory through sophisticated communication systems. Assigning 
 functions to specific neuronal cell types is essential for understanding 
 underlying mechanisms but remains challenging with currently available to
 ols. The DART (Drugs Acutely Restricted by Tethering) system is a newly d
 eveloped approach that predominate over existing methods by uniquely enab
 ling spatiotemporal modulation of endogenous proteins with cell-type spec
 ificity. DART employs HaloTag protein (HTP)\, a self-labeling enzyme\, to
  achieve specificity through restricted expression in defined cell types.
  Its versatility has been demonstrated\, for example\, in delineating AMP
 AR-mediated motor control pathways in Parkinsonian mice. Building on this
  foundation\, the present work extends DART to opioid receptors (ORs) and
  voltage-gated sodium channels (Navs)\, both of which mediate essential f
 unctions but remain incompletely understood.\n\nThis dissertation focuses
  on developing DART probes targeting OR subtypes and Navs to define their
  specific roles\, such as pain processing and reward regulation for ORs\,
  and excitability and pathological states such as epilepsy for Navs. Guid
 ed by X-ray crystal structures and docking studies\, we successfully deve
 loped subtype-selective OR-DART probes: naltrexone2DART.2 for μ-OR\, nalt
 rindole3DART.2 for δ-OR\, and benzamideDART.2 for κ-OR. In parallel\, we 
 generated potent Nav-DART probes\, JHNav2DART.2 and JHNav3DART.2\, which 
 effectively suppressed neuronal firing through cell-specific Navs modulat
 ion in cultured hippocampal neurons.\n\nWe anticipate that these newly de
 veloped probes\, efficient and subtype-selective OR-DART probes and poten
 t Nav-DART probes\, will serve as powerful tools for uncovering target-sp
 ecific neuronal functions that shape behavior via cell-specific modulatio
 n. Ultimately\, we expect that applying these probes within the DART plat
 form will expand and advance knowledge of the cell-specific roles of ORs 
 and Navs in both normal physiology and neurological disease.
DURATION:PT1H
DTSTAMP:20251022T155154Z
DTSTART;TZID=America/New_York:20251104T090000
LAST-MODIFIED:20251022T155154Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Chemistry Defense: Yunju Oh: Development of DART (Drugs Acutely Re
 stricted by Tethering) Probes for Targeting Opioid Receptors and Voltage-
 Gated Sodium Channels
UID:CAL-8a00ec8b-979413b9-019a-0c9ea541-0000373ademobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-SPEAKER:Yunju Oh
X-BEDEWORK-STUDENT-CONTACT;X-BEDEWORK-PARAM-EMAIL=chem-office@duke.edu:Che
 m Admin Office
X-BEDEWORK-IMAGE-X1:0
X-BEDEWORK-IMAGE-Y1:174
X-BEDEWORK-IMAGE-X2:1281
X-BEDEWORK-IMAGE-Y2:1028
X-BEDEWORK-IMAGE-CROP-WIDTH:1281
X-BEDEWORK-IMAGE-CROP-HEIGHT:854
X-BEDEWORK-IMAGE-ALT-TEXT:YO
X-BEDEWORK-SUBMITTEDBY:lao26 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
X-BEDEWORK-IMAGE:/public/Images/YO_20251022035154PM.jpg
X-BEDEWORK-THUMB-IMAGE:/public/Images/YO_20251022035154PM-thumb.png
END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20251007T140543Z
DESCRIPTION:Addressing the Key Challenges of Light Penetration and Charge 
 Separation for Plasmonic Catalysis\n\nResearch into high temperature phot
 ocatalysis has revealed advantages to using light to augment or replace t
 hermal energy for the synthesis of feedstock chemicals. However\, poor pe
 netration of light into a typical powder catalyst bed poses a challenge f
 or efficient high temperature photo-driven heterogenous catalysis. To add
 ress this issue\, we present a 3D porous optical diffuser loaded with pla
 smonic Rh nanoparticles enabling volumetric illumination of the nanoparti
 cle catalysts. This monolithic plasmonic Rh/SiO2 structure exhibits drama
 tically increased response to light compared to powdered catalyst. The br
 oad illumination gradient can be tuned by augmenting the loading scheme c
 reating a more homogenous optical environment. Replacing the sharp transi
 tion from intensely illuminated surface to dark subsurface improves the s
 electivity of the CO2 reduction reaction from 68% to 97% while achieving 
 greater efficiency. A sacrificial template composed of fused zinc oxide t
 etrapods enhances porosity\, improving mass transport over conventional a
 erogel supported catalysts. Serendipitously\, the ZnO scaffolding impleme
 nted to improve mass flow also provides easier nanoparticle loading as we
 ll as the potential for more facile adjustments to the aerogel's surface 
 chemistry. This approach to supported photocatalyst design provides excep
 tional flexibility for tuning the balance between optical properties\, ma
 ss flow considerations\, available metal surface area\, at a cost to ther
 mal transport.  A second challenge facing plasmonic catalysis is the shor
 t charge separated lifetime of hot carriers produced by plasmon dephasing
 \, typically on the order of femtoseconds. The latter portion of this dis
 sertation explores the introduction of a type-II junction to the supporti
 ng structure to further separate carriers\, prolonging excited lifetimes.
 
DURATION:PT1H
DTSTAMP:20251007T140543Z
DTSTART;TZID=America/New_York:20251111T110000
LAST-MODIFIED:20251007T140543Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Chemistry Defense: Joey Offen: Addressing the Key Challenges of Li
 ght Penetration and Charge Separation for Plasmonic Catalysis
UID:CAL-8a00ec8b-979413b9-0199-befe0c53-0000715ddemobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-SPEAKER:Joey Offen
X-BEDEWORK-STUDENT-CONTACT;X-BEDEWORK-PARAM-EMAIL=chem-office@duke.edu:Che
 m Admin Office
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X-BEDEWORK-IMAGE-ALT-TEXT:JO
X-BEDEWORK-SUBMITTEDBY:lao26 for Chemistry (agrp_ArtsandSciences_Chemistry
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END:VEVENT
BEGIN:VEVENT

CATEGORIES:Natural Sciences
CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20260116T185313Z
DESCRIPTION:Copper-Catalyzed Electrophilic Amination of O-Acyl-N-Hydroxyam
 ines with Alkenes for the Synthesis of  Allylic Amines and Vicinal Diamin
 es\n\nNitrogen atoms are ubiquitous in bioactive organic molecules where 
 they are key contributors to molecular recognition\, making the synthesis
  of nitrogen-containing molecules an important task in organic chemistry.
  Alkylamines are a privileged class of nitrogenous molecules common in ph
 armaceuticals. To improve the efficiency with which these important molec
 ules can be synthesized\, the development of catalytic methodology for C(
 sp3)-N bond construction is ongoing. One approach is the electrophilic am
 ination of alkenes and other SOMOphiles to achieve multi-component cascad
 e reactions. However\, this strategy as well as other amination reactions
  frequently rely on specialized nitrogen sources lacking structural diver
 sity.\n\nThe Wang laboratory has developed a copper-catalyzed platform fo
 r electrophilic amination using O-acyl-N-hydroxyamines as convenient prec
 ursors to diverse alkylamino groups. This thesis describes the developmen
 t of methods for the synthesis of allylic amines and vicinal diamines usi
 ng this platform.\n\nThe allylic amination reaction provides a method for
  the synthesis of tertiary N-alkyl allylamines from variously substituted
  alkenes. A sulfonic acid is used to enhance the electrophilicity of the 
 radical aminating species while the π-bond is selectively transposed with
  selective elimination of β-hydrogen. Investigation of mechanism for this
  catalytic process revealed the presence of radical intermediates\, an el
 ectronic influence on the desaturation step\, and an absence of kinetic i
 sotope effect in C-H cleavage. These findings support a turnover-limiting
  step that precedes desaturation of the radical intermediate and favors a
 n oxidative elimination mechanism of C-H cleavage.\n\nVicinal diamine syn
 thesis is accomplished by a copper-catalyzed three-component reaction of 
 vinylarene\, O-acyl-N-hydroxyamine\, and alkylamine·BF3 complex. This rea
 ction identifies trifluoroborate complexes as an effective means to overc
 ome the challenges associated with nucleophilic amines in transition meta
 l catalysis and obtain regioselective synthesis. In the presence of a chi
 ral catalyst\, unprecedented enantioselective benzylic amination by alkyl
 amino groups is achieved. Preliminary reaction conditions yield up to 60%
  diamine product and 85% enantiomeric excess (e.e.).
DURATION:PT1H
DTSTAMP:20260116T185313Z
DTSTART;TZID=America/New_York:20260203T100000
LAST-MODIFIED:20260116T185313Z
LOCATION;X-BEDEWORK-UID=18832e99-2b52a4d8-012b-5382144d-00000090:French Fa
 mily Science Center 3232
STATUS:CONFIRMED
SUMMARY:Chemistry Defense: EJ McLaren: Copper-Catalyzed Electrophilic Amin
 ation of O-Acyl-N-Hydroxyamines with Alkenes for the Synthesis of  Allyli
 c Amines and Vicinal Diamines
UID:CAL-8a00eca5-9af98aae-019b-c8278f67-0000054ddemobedework@mysite.edu
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 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Natural Sciences:/user/publi
 c-user/Topics/Natural Sciences
X-BEDEWORK-SPEAKER:EJ McLaren
X-BEDEWORK-STUDENT-CONTACT;X-BEDEWORK-PARAM-EMAIL=chem-office@duke.edu:Che
 m Admin Office
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X-BEDEWORK-IMAGE-CROP-HEIGHT:1080
X-BEDEWORK-IMAGE-ALT-TEXT:EJ
X-BEDEWORK-SUBMITTEDBY:lao26 for Chemistry (agrp_ArtsandSciences_Chemistry
 )
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END:VCALENDAR