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Date:07TuesdayFebruary 2023Lecture
iSCAR seminar
More information Time 09:00Location Max and Lillian Candiotty Building
AuditoriumLecturer Prof. Hellmut AugustinOrganizer Department of Immunology and Regenerative BiologyContact -
Date:07TuesdayFebruary 2023Lecture
Antimicrobial Peptides against Multidrug-Resistant Biofilm from Cystic Fibrosis Patients
More information Time 10:00 - 11:00Location Nella and Leon Benoziyo Building for Biological Sciences
CafeteriaLecturer Daniel Ben Hur
Dept. of Biomolecular Sciences-WISOrganizer Department of Biomolecular SciencesContact -
Date:07TuesdayFebruary 2023Lecture
From Spin Materials to Electron Transfer Catalysis
More information Time 11:00 - 12:00Location Gerhard M.J. Schmidt Lecture HallLecturer Prof. Swadhin K Mandal
Department of Chemical Sciences, Indian Institute of Science Education and Research, KolkataOrganizer Department of Molecular Chemistry and Materials ScienceContact Abstract Show full text abstract about The major concerns about industrially used catalytic systems...» The major concerns about industrially used catalytic systems today are: i) the high cost of catalysts; ii) the toxicity of heavy transition metals; iii) difficulties in removing trace amounts of toxic-metal residues from the desired product; and, finally, iv) rare transition metal depletion, which does not meet the requirement of sustainable development. Developing environmentally friendly catalysts is an excellent option in this regard. Naturally, the most recent catalyst development trend heralded a new era of metal-free catalysis or catalysts based on earth-abundant, nontoxic, and low-cost metals. This talk will go over our recent advances [1-4] in using small molecules to systematically mimic transition metal-based catalysis. We designed electron transfer catalysis using the smallest polycyclic odd alternant hydrocarbon, phenalenyl (PLY)-based molecules, which was inspired by a completely different field of molecular spin materials [5]. This talk will focus on how to avoid transition metals when performing various cross-coupling catalysis.
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Date:07TuesdayFebruary 2023Lecture
The pyrenoid: a liquid-liquid phase separated CO2 fixing organelle
More information Time 11:30 - 12:30Location Nella and Leon Benoziyo Building for Biological Sciences
AuditoriumLecturer Prof. Luke Mackinder
University of YorkOrganizer Department of Plant and Environmental SciencesContact Details Show full text description of Host: Dr. Assaf Gal...» Host: Dr. Assaf Gal -
Date:07TuesdayFebruary 2023Lecture
Mapping brainstem nuclei structure and connectivity in health and disease
More information Time 12:30 - 13:30Location Gerhard M.J. Schmidt Lecture HallLecturer Dr. Marta Bianciardi
Radiology, Harvard Medical School Martinos Center for Biomedical Imaging, MGHOrganizer Department of Brain SciencesContact Details Show full text description of Host: Dr. Michal Ramot michal.ramot@weizmann.ac.il For ac...» Host: Dr. Michal Ramot michal.ramot@weizmann.ac.il
For accessibility issues contact:naomi.moses@weizmann.ac.ilAbstract Show full text abstract about Brainstem nuclei in humans play a crucial role in vital func...» Brainstem nuclei in humans play a crucial role in vital functions, such as arousal, autonomic homeostasis, sensory and motor relay, nociception, and sleep and have been implicated in a vast array of brain pathologies, including disorders of consciousness, sleep disorders, autonomic disorders, pain, Parkinson’s disease and other motor disorders. Yet, an in vivo delineation of most human brainstem nuclei location and connectivity using conventional imaging has been elusive because of limited sensitivity and contrast for detecting these small regions using standard neuroimaging methods. In this talk, Dr. Bianciardi will present the probabilistic atlas and connectome of 31 brainstem nuclei of the arousal, motor, autonomic and sensory systems developed by her team in healthy living humans using structural, functional and diffusion-based MRI at 7 Tesla. She will also show the translatability of 7 Tesla connectivity results to conventional 3 Tesla imaging. Dr Bianciardi will conclude her seminar by presenting the first translational application of the brainstem nuclei atlas to investigate arousal and motor mechanisms in traumatic coma and premanifest synucleinopathy.
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Date:09ThursdayFebruary 2023Lecture
Seminar for PhD Thesis Defense
More information Time 09:30Title “Mapping functional components of viral infection”Location Arthur and Rochelle Belfer Building for Biomedical Research
Botnar AuditoriumLecturer Yaara FinkelOrganizer Department of Molecular GeneticsContact -
Date:09ThursdayFebruary 2023Lecture
Seminar for thesis defense with Yaara Finkel
More information Time 09:30 - 10:30Title Mapping functional components of viral infectionLocation Arthur and Rochelle Belfer Building for Biomedical Research
Botnar AuditoriumLecturer Yaara FinkelOrganizer Department of Molecular GeneticsContact -
Date:09ThursdayFebruary 2023Lecture
“EPR and low-field DNP with arbitrary waveform excitation”
More information Time 09:30 - 10:30Location Gerhard M.J. Schmidt Lecture HallLecturer Dr Nino Wili
Dpet Chemistry, Aarhus UniversityOrganizer The Helen and Martin Kimmel Institute for Magnetic Resonance ResearchContact Abstract Show full text abstract about Until recently, pulse EPR was based solely on rectangular pu...» Until recently, pulse EPR was based solely on rectangular pulses. This changed with the introduction
of fast arbitrary waveform generators (AWG) that allow for pulse shaping and phase/frequency modulation at microwave frequencies. Early applications of this technology focused mainly on chirp pulses for broadband excitation and inversion within existing pulse sequences.
In this talk, I will focus on Dynamic Nuclear Polarization with modulated pulse sequences in static solids.
The theoretical description shows remarkable similarities with dipolar recoupling sequences in magic angle spinning (MAS) NMR. In dipolar recoupling, the pulse sequence interferes with the time-dependence of interactions due to the sample spinning. A similar phenomenon takes place in pulsed DNP, where the pulses interfere with the rotation in spin space due to the nuclear Zeeman interaction.
After introducing the theoretical background, I will show results at 0.35 T/15 MHz/9.5 GHz. I will then discuss the implications for pulsed DNP at higher magnetic fields. Finally, I show and propose experiments to make use of DNP within the context of pulse EPR, i.e. for detecting hyperfine coupled nuclei in the vicinity of unpaired electrons
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Date:09ThursdayFebruary 2023Lecture
Vision and AI
More information Time 12:15 - 13:15Title The implicit bias of SGD: A Minima stability analysisLocation Jacob Ziskind Building
Room 1Lecturer Tomer Michaeli
TechnionOrganizer Department of Computer Science and Applied Mathematics
SeminarContact Abstract Show full text abstract about One of the puzzling phenomena in deep learning, is that neur...» One of the puzzling phenomena in deep learning, is that neural networks tend to generalize well even when they are highly overparameterized. Recent works linked this behavior with implicit biases of the algorithms used to train networks (like SGD). Here we analyze the implicit bias of SGD from the standpoint of minima stability, focusing on shallow ReLU networks trained with a quadratic loss. Specifically, it is known that SGD can stably converge only to minima that are flat enough w.r.t. its step size. Here we show that this property enforces the predictor function to become smoother as the step size increases, thus significantly regularizing the solution. Furthermore, we analyze the representation power of stable solutions. Particularly, we prove a depth-separation result: There exist functions that cannot be approximated by depth-2 networks corresponding to stable minima, no matter how small the step size is taken to be, but which can be implemented with depth-3 networks corresponding to stable minima. We show how our theoretical findings explain behaviors observed in practical settings.
(Joint works with Rotem Mulayoff, Mor Shpigel Nacson, Greg Ongie, Daniel Soudry).
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Date:09ThursdayFebruary 2023Lecture
Machine Learning and Statistics Seminar
More information Time 12:15 - 13:15Title The implicit bias of SGD: A Minima stability analysisLocation Jacob Ziskind Building
Room 1Lecturer Tomer Michaeli
TechnionOrganizer Department of Computer Science and Applied Mathematics
SeminarContact Abstract Show full text abstract about One of the puzzling phenomena in deep learning, is that neur...» One of the puzzling phenomena in deep learning, is that neural networks tend to generalize well even when they are highly overparameterized. Recent works linked this behavior with implicit biases of the algorithms used to train networks (like SGD). Here we analyze the implicit bias of SGD from the standpoint of minima stability, focusing on shallow ReLU networks trained with a quadratic loss. Specifically, it is known that SGD can stably converge only to minima that are flat enough w.r.t. its step size. Here we show that this property enforces the predictor function to become smoother as the step size increases, thus significantly regularizing the solution. Furthermore, we analyze the representation power of stable solutions. Particularly, we prove a depth-separation result: There exist functions that cannot be approximated by depth-2 networks corresponding to stable minima, no matter how small the step size is taken to be, but which can be implemented with depth-3 networks corresponding to stable minima. We show how our theoretical findings explain behaviors observed in practical settings.
(Joint works with Rotem Mulayoff, Mor Shpigel Nacson, Greg Ongie, Daniel Soudry).
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Date:09ThursdayFebruary 2023Lecture
What can radiocarbon dating tell us about the diagenesis of tooth enamel?
More information Time 13:30Location Room 590, Benoziyo Building for Biological Science, Weizmann Institute of ScienceLecturer Dr. Rachel Wood
Oxford Radiocarbon Accelerator Unit, School of Archaeology, Oxford, UKContact Details Show full text description of Please follow the link or Zoom ID to join remotely. Join Zo...» Please follow the link or Zoom ID to join remotely.
Join Zoom Meeting:
https://weizmann.zoom.us/j/4845901524?pwd=dkYybWIvTXVSaW40YmF2TEVxVFg0UT09
Meeting ID: 484 590 1524
Meeting password: 045940 -
Date:09ThursdayFebruary 2023Lecture
Genetic and Epigenetic Drivers of Melanoma Formation and Progression
More information Time 14:00 - 15:00Location Max and Lillian Candiotty Building
AuditoriumLecturer Marcus Bosenberg, MD, PhD
Anthony N. Brady Professor of Dermatology, Pathology, and Immunobiology Director, Yale Center for Immuno-Oncology Director, Yale SPORE in Skin Cancer Director, Center for Precision Cancer Modeling Co-Leader, Cancer Immunology Program Yale UniversityOrganizer Dwek Institute for Cancer Therapy Research
Cancer Research ClubContact Details Show full text description of Meeting URL: https://weizmann.zoom.us/j/5065402023?pwd=a3Z6K...» Meeting URL: https://weizmann.zoom.us/j/5065402023?pwd=a3Z6KzRCU0xJaUFoM2Y5emZwZm1oZz09
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Date:09ThursdayFebruary 2023Lecture
Some like it hot - the effect of future warming on calcifying organisms
More information Time 14:00 - 15:00Location https://weizmann.zoom.us/j/93009427308?pwd=NjBRVUxvank2cWRzT0U2NXFVMDFjdz09Lecturer Dr. Danna Teitelboim
University of OxfordOrganizer Department of Plant and Environmental SciencesContact Details Show full text description of Host: Dr. David Zeevi...» Host: Dr. David Zeevi -
Date:12SundayFebruary 2023Lecture
“Life at Interfaces- Challenges and Opportunities in the Miniaturization of Bioinspired Robots”
More information Time 11:00 - 12:00Location Perlman Chemical Sciences Building
Room 404Lecturer Dr. Bat-El Pinchasik
School of Mechanical Engineering, Faculty of Engineering, TAUOrganizer Department of Molecular Chemistry and Materials ScienceContact -
Date:12SundayFebruary 2023Lecture
Understanding nutritional impact on bone development and quality
More information Time 15:00 - 16:00Location Arthur and Rochelle Belfer Building for Biomedical Research
Botnar AuditoriumLecturer Prof. Efrat Monsonego Ornan
Institute of Biochemistry and Nutrition The Faculty of Agriculture, Food and Environment The Hebrew University of JerusalemOrganizer Life Sciences
Metabollic Research ForumContact -
Date:13MondayFebruary 202315WednesdayFebruary 2023Conference
New approaches to early embryogenesis & epigenetics
More information Time 08:00 - 08:00Location The David Lopatie Conference CentreChairperson Yonatan StelzerOrganizer The Aharon Katzir-Katchalsky Center , The Helen and Martin Kimmel Institute for Stem Cell ResearchHomepage Contact -
Date:13MondayFebruary 2023Colloquia
TBD
More information Time 11:00 - 12:15Location Gerhard M.J. Schmidt Lecture HallLecturer Prof. Jacob Sagiv
Molecular Chemistry and Materials Science DepartmentOrganizer Faculty of ChemistryHomepage Contact -
Date:14TuesdayFebruary 2023Lecture
Photoinduced regioselective functionalization of arenes at proximal and distal sites
More information Time 11:00 - 12:00Location Gerhard M.J. Schmidt Lecture HallLecturer Prof. Debabrata Maiti
Department of Chemistry & IDP in Climate Studies, IIT BombayOrganizer Department of Molecular Chemistry and Materials ScienceContact Abstract Show full text abstract about Over years’ transition metal-catalyzed C-H activation has pr...» Over years’ transition metal-catalyzed C-H activation has propelled the field of organic synthesis for the construction of structurally complex and diverse molecules in resource-economical fashion. In this context, non-directed C-H activation has gained unprecedented attention for attaining region-specific C-H functionalizations in a step-economic mode. Unlike traditional Fujiwara-Moritani reaction, this approach relies on ligand assistance and thus uses arene as the limiting reagent. However, all existing non-directed C-H functionalizations utilize high thermal energy to induce the functional group which eventually put the regioselectivity at stake. In addition, use of super stoichiometric costly silver salts to regenerate the catalyst produces unwanted metal waste. In aid of developing a more sustainable and environmentally benign approach, we have established a photoredox catalytic system by a merger of palladium/organo-photocatalyst(PC) which forges highly regeiospecific C-H olefination of diverse arenes and heteroarenes. Visible light nullifies the requirement of silver salts and thermal energy in executing “region-resolved” Fujiwara-Moritani reaction.
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Date:14TuesdayFebruary 2023Lecture
Dynamics of adaptive variation generation and maintenance under very prolonged resource exhaustion
More information Time 11:30 - 12:30Location Nella and Leon Benoziyo Building for Biological Sciences
AuditoriumLecturer Prof. Ruth Hershberg
Faculty of Medicine, TechnionOrganizer Department of Plant and Environmental SciencesContact Details Show full text description of Host: Dr. David Zeevi...» Host: Dr. David Zeevi -
Date:15WednesdayFebruary 2023Lecture
Special Guest Seminar
More information Time 11:00 - 12:00Location Max and Lillian Candiotty Building
AuditoriumLecturer Dr. Tomer Itkin
Transcriptional Regulation of Hemato-Vascular Cell Fate PlasticityOrganizer Department of Immunology and Regenerative BiologyContact