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יוני 01, 2018
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Date:16ראשוןדצמבר 2018הרצאה
Soft Matter and Biomaterials Seminar
More information שעה 11:00 - 12:00כותרת Assembly of Supported Lipid Bilayers and the Effect of Nano-Patternsמיקום בניין פרלמן למדעי הכימיהמרצה Dr. Yair Kaufman
Zuckerberg Institute for Water Research, Ben-Gurion University of the Negevמארגן המחלקה לכימיה מולקולרית ולמדע חומריםצרו קשר -
Date:16ראשוןדצמבר 2018הרצאה
Molecular Genetics Departmental Seminars 2018-2019
More information שעה 13:00 - 13:00כותרת A repressor-decay timer for robust temporal patterning of Drosophila neurogenesisמיקום בניין ארתור ורושל בלפר למחקר ביורפואימרצה Inna Averbukh מארגן המחלקה לגנטיקה מולקולריתצרו קשר -
Date:16ראשוןדצמבר 2018הרצאה
Economic Implications of Irrigation-Water Salinity
More information שעה 13:00 - 14:00כותרת SAERI - Sustainability and Energy Research Initiativeמיקום Benoziyo Building for Biological Sciences, room 690Cמרצה Dr. Iddo Kan
Department of Environmental Economics and Management and The Center for Agricultural Economics Research, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalemמארגן בית הספר למחקר - מכון ויצמן למדעצרו קשר -
Date:16ראשוןדצמבר 2018הרצאה
Data-driven study of complex systems: from nonlinear PDEs to crumpled papers
More information שעה 13:00 - 13:00מיקום בניין הפיזיקה ע"ש עדנה וק.ב. וייסמןמרצה Yohai Bar-Sinai, Harvard University מארגן מרכז לפיזיקה ביולוגית עש קלורצרו קשר תקציר Show full text abstract about Data-driven methods, and Machine-Learning in particular, bec...» Data-driven methods, and Machine-Learning in particular, became very popular in many diverse fields due to their unprecedented ability to identify recurring features, causal relations and complex correlation structures. For the same reasons, the application of these methods to the physical sciences has also attracted much attention, though the field is still very much in its infancy. In this talk I will discuss two applications of Machine-Learning to the study of complex systems: First, I will show how data-driven discretization of nonlinear PDEs can produce accurate low-resolution models, effectively providing a coarse-grained equation which accounts for sub-gridscale physics. Second, I will discuss crumpling of thin sheets and how Machine-Learning can be insightful in studying the emergent patterns, by augmenting the dataset with in-silico calculations of a related system - rigid origami. This also suggests a general strategy of applying data-driven methods to experimental systems where data is scarce or expensive. -
Date:16ראשוןדצמבר 2018הרצאה
Remodelling of the vasculature in cardiovascular disease
More information שעה 13:00 - 14:00מיקום בניין ע"ש מקס ולילאן קנדיוטימרצה Prof. Andrew Baker מארגן המחלקה לאימונולוגיה ורגנרציה ביולוגיתצרו קשר -
Date:17שנידצמבר 2018סימפוזיונים
Life Science Colloquium
More information שעה כל היוםכותרת TBDמיקום אולם ע"ש דולפי ולולה אבנרמרצה Prof. Andrew J. Pollard
Dept. of Paediatrics, University of Oxford, UKצרו קשר -
Date:17שנידצמבר 201818שלישידצמבר 2018כנסים
Genealogy and the Sciences
More information שעה 08:00 - 08:00מיקום מרכז כנסים על-שם דויד לופאטייושב ראש Daniel Hanoch Wagnerדף בית -
Date:17שנידצמבר 2018הרצאה
Weizmann – Princeton – CNRS – HIT Plasma Workshop
More information שעה 09:00 - 17:45מיקום בניין הפיזיקה ע"ש עדנה וק.ב. וייסמןמרצה Dimitry Mikichuk
magnetic field structure in a converging magnetized-plasmaמארגן המחלקה לפיזיקה של חלקיקים ואסטרופיזיקהצרו קשר -
Date:17שנידצמבר 2018הרצאה
Halide Exchange in Single Crystal Halide Perovskites
More information שעה 14:00 - 15:00מיקום בניין פרלמן למדעי הכימיהמרצה Aya Osherov מארגן המחלקה לכימיה מולקולרית ולמדע חומריםצרו קשר תקציר Show full text abstract about Halide Perovskites (HaPs) have remarkable electronic and opt...» Halide Perovskites (HaPs) have remarkable electronic and optical characteristics, but much is still unknown regarding the connection between their physical and chemical properties. Cation or anion substitution can change the optical absorption edge, with or without change of structure. In this work I explored the halide exchange reaction in methylammonium lead tri-halides single crystals (SCs) in order to understand the process of exchange and the stability of the product(s). I demonstrate halide exchange in mm-sized SCs, achieved by diffusion. Using the Boltzmann-Matano method and diffusion profiles obtained by electron dispersive spectroscopy it is possible to evaluate the halide diffusion coefficients, which are not constant and depend on the mixture of halides. For all permutations, the change in composition as result of the diffusion, strongly affects the optical and electrical properties and especially the band gap of the semiconducting crystals, as seen in cathodoluminescence measurements in the scanning electron microscope. While these gradients cause a lattice parameter change and may cause a symmetry change, X-ray diffraction measurements show that if the interchanged halide pair is such that their sizes are relatively similar (e.g., and , and but not and ) the resulting material remains surprisingly single crystalline. These findings are valid, no matter which one of the two halides is being exchanged. These results suggest that for these similar-sized halide pairs, this exchange occurs through a solid-state chemical reaction such that the resulting crystal orientation is determined by that of the initial crystal. -
Date:18שלישידצמבר 2018הרצאה
Weizmann – Princeton – CNRS – HIT Plasma Workshop
More information שעה 09:45 - 17:15מיקום בניין הפיזיקה ע"ש עדנה וק.ב. וייסמןמרצה Seth Davidovits
Preventing or exploiting turbulence during plasma compressionמארגן המחלקה לפיזיקה של חלקיקים ואסטרופיזיקהצרו קשר -
Date:18שלישידצמבר 2018הרצאה
Global outbreaks: Interferons as 1st responders
More information שעה 10:00 - 11:00מיקום בניין לביוכימיה על שם נלה וליאון בנוזיומרצה Prof. Eleanor N. Fish
Dept. Immunology, University of Toronto, Canadaמארגן המחלקה למדעים ביומולקולרייםצרו קשר תקציר Show full text abstract about Emerging and re-emerging virus infections pose a threat to g...» Emerging and re-emerging virus infections pose a threat to global health. Viruses mutate to inevitably evade the effects of pathogen-specific antivirals, and the time required to develop a vaccine specific for an outbreak virus leaves populations unprotected for months. Our strategy is to focus on broad spectrum antivirals for diverse acute virus infections: interferons (IFNs)-. IFNs- exert both direct antiviral effects in infected cells and modulate host immune responses to clear virus. Data will be presented providing evidence for the antiviral effects of IFNs-against influenza A viruses H5N1 and pandemic H1N1, the SARS coronavirus and ebola virus, in vitro and in clinical studies during outbreaks. The mechanisms whereby IFNs-exert their antiviral effects and override the inhibitory effects of viruses will be described. -
Date:18שלישידצמבר 2018הרצאה
Who Wants my Half Eaten Artisanal Sandwich?: Food in The Sharing Economy
More information שעה 11:30 - 11:30כותרת UPDATED UPON CHANGE OF LECTURERמיקום בניין לביוכימיה על שם נלה וליאון בנוזיומרצה Tamar Makov
Center for Industrial Ecology, School of Forestry and Environmental Studies, Yale Universityמארגן המחלקה למדעי הצמח והסביבהדף בית צרו קשר תקציר Show full text abstract about It is often claimed that the “sharing economy,” as implement...» It is often claimed that the “sharing economy,” as implemented via networks of mobile apps and users, yields environmental benefits through the efficient redistribution of already-existing assets and resources. Yet, little is known about how these networks actually function and, indeed, whether they deliver on their promises. In this research, we aim to reveal insights into the nature and dynamics of the sharing economy through a deep dive into a real-world food sharing network. Relying on a comprehensive dataset provided by a global peer-to-peer (P2P) food-sharing platform, we analyze roughly 200,000 cases of food sharing to examine the nature and evolution of free sharing networks, and calculate the environmental costs and benefits of food sharing via the platform. Our result shed light on the role the sharing economy can play in addressing sustainability challenges such as food waste. In addition, our findings can help guide the future development of the broad universe of sharing economy platforms toward maximizing environmental and social benefits. -
Date:18שלישידצמבר 2018הרצאה
Functional stability in a dynamic network – the role of inhibition
More information שעה 12:30 - 12:30מיקום בניין לחקר המוח על-שם נלה וליאון בנוזיומרצה Prof. Yonatan Loewenstein
Department of Neurobiology – ELSC Hebrew University of Jerusalemמארגן המחלקה למדעי המוחצרו קשר תקציר Show full text abstract about According to the synaptic trace theory of memory, activity-i...» According to the synaptic trace theory of memory, activity-induced changes in the pattern of synaptic connections underlie the storage of information for long periods. In this framework, the stability of memory critically depends on the stability of the underlying synaptic connections. Surprisingly however, the excitatory synaptic connections, which constitute most of the synapses in the cortex, are highly volatile in the living brain, which poses a fundamental challenge to the synaptic trace theory. We show that in the balanced cortex, patterns of neural activity are primarily determined by the inhibitory connectivity, despite the fact that most synapses and neurons are excitatory. Similarly, we show that the inhibitory network is more effective in storing memory patterns than the excitatory one. As a result, network activity is robust to ongoing volatility of excitatory synapses, as long as this volatility does not disrupt the balance between excitation and inhibition. We thus hypothesize that inhibitory connectivity, rather than excitatory, controls the maintenance and loss of information over long periods of time in the volatile cortex.
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Date:18שלישידצמבר 2018הרצאה
Translational control of cancer and neurological disease via eIF4E
More information שעה 14:00 - 15:00מיקום בניין ארתור ורושל בלפר למחקר ביורפואימרצה Prof. Nahum Sonenberg
Department of Biochemistry McGill University, Montreal CANADAמארגן המחלקה לביולוגיה מבנית וכימיתצרו קשר -
Date:19רביעידצמבר 2018הרצאה
Weizmann – Princeton – CNRS – HIT Plasma Workshop
More information שעה 09:45 - 16:00מיקום בניין הפיזיקה ע"ש עדנה וק.ב. וייסמןמרצה Christine Stollberg
Evolution of the current distribution in a small-scale self-compressing plasmaמארגן המחלקה לפיזיקה של חלקיקים ואסטרופיזיקהצרו קשר -
Date:19רביעידצמבר 2018הרצאה
“Anharmonicity and Electron-Phonon Interaction in Dielectrically-Confined 2D Materials”
More information שעה 14:00 - 15:30מיקום בניין פרלמן למדעי הכימיהמרצה Dr. Matan Menahem
Dept. Materials and Interfacesמארגן המחלקה לכימיה מולקולרית ולמדע חומריםצרו קשר תקציר Show full text abstract about Electron-phonon interaction (EPI) is the influence of struct...» Electron-phonon interaction (EPI) is the influence of structural dynamics on charge-carrier’s band structure, by changes in the potential acting on a charge carrier due to atomic displacements. When the atomic displacements are anharmonic, and the quasi-harmonic approximation is no longer sufficient, the existing theory fails to explain or predict the macroscopic properties of the material. In quantum confined systems with dielectric mismatch between well and barrier, the effect of atomic displacements on the dielectric environment of charge carriers is greater due to dielectric confinement. 2D hybrid halide perovskites (HHPs) are easy to synthesize, easily tunable dielectric confined materials with pronounced optical response, even at room temperature. Recent studies show the effect of anharmonicity on the optical properties of 3D perovskites and strong EPI in 2D HHPs, affected by temperature. I aim to investigate the effect of anharmonicity on the dielectric environment of charge carriers in prototypical dielectric confined 2D HHPs, using various methods of optical spectroscopy. I hypothesize that anharmonicity would decrease the excitonic binding energy and electron-phonon scattering, due to more efficient charge screening and phonon-phonon scattering. -
Date:20חמישידצמבר 2018הרצאה
Imm Special Guest Seminar:Dr. Moshe Biton ,will lecture about "Exploring epithelial-immune cell interactions of mucosal surfaces in health and disease”
More information שעה כל היוםמיקום בניין ע"ש מקס ולילאן קנדיוטימרצה Dr. Moshe Biton
The Klarman Cell Observatory, Broad Institute of Harvard and MIT, Cambridge, MA, USA. Department of Molecular Biology, Massachusetts General Hospital, Boston, MA, USA.מארגן המחלקה לאימונולוגיה מערכתיתצרו קשר -
Date:20חמישידצמבר 2018כנסים
Annual meeting of the ISBMB
More information שעה 08:00 - 17:30מיקום מרכז כנסים על-שם דויד לופאטייושב ראש Yifat Merblדף בית -
Date:20חמישידצמבר 2018הרצאה
Weizmann – Princeton – CNRS – HIT Plasma Workshop
More information שעה 09:45 - 16:00מיקום בניין הפיזיקה ע"ש עדנה וק.ב. וייסמןמרצה Mikhail Mlodok
Stratification effects in magnetized multi-ion plasma” + Discussionמארגן המחלקה לפיזיקה של חלקיקים ואסטרופיזיקהצרו קשר -
Date:20חמישידצמבר 2018הרצאה
Effects of electron spin dynamics on DNP at 7 Tesla
More information שעה 10:00 - 11:00מיקום בניין פרלמן למדעי הכימיהמרצה Dr. Ilya Kaminker
School of Chemistry, The Raymond and Beverly Sackler Faculty of Exact Sciences, TAUמארגן המחלקה לכימיה מולקולרית ולמדע חומריםצרו קשר תקציר Show full text abstract about Dynamic Nuclear Polarization (DNP) is the most widespread an...» Dynamic Nuclear Polarization (DNP) is the most widespread and ubiquitous technique for signal enhancement in Nuclear Magnetic Resonance (NMR). The gain in signal intensity is achieved by polarization transfer from the highly-polarized electron spins to the nuclear spins of interest. The home-build DNP/EPR spectrometer in the laboratory of Prof. Songi Han at UCSB allowed for the first time direct observation of the electron spin dynamics in the course of DNP experiment at NMR-relevant magnetic field (≥ 7 Tesla); measurement of electron relaxation times T1 and T2 and electron-electron spin diffusion rate by Electron-Electron DOuble resonance (ELDOR) under DNP conditions. I will present how the addition of 200 GHz arbitrary pulse shaping extended the ability to manipulate the electron spins in both EPR and DNP experiments. Specifically, up to a factor of five improvement in DNP performance was observed when a train of chirp pulses (chirp-DNP) was substituted for conventional, continuous wave microwave irradiation. The combination of shaped-pulse ELDOR together with DNP profile lineshape analysis allowed us to conclude that the gain in performance in chirp-DNP is due to recruitment of additional electron spins that participate in DNP via cross effect (CE) mechanism as opposed to the indirect CE (iCE) mechanism that dominates in the conventional CW DNP experiments under similar conditions.
In addition to serving as the source of the polarization, the electron spins can have other, sometimes detrimental, effects on the NMR spectra such as shifting the position of the peaks (Paramagnetic Shift) and decreasing resolution by linewidth increase (Paramagnetic relaxation) collectively known as paramagnetic effects (PE). We have recently observed the reversal of PE upon microwave irradiation in DNP experiments at liquid helium temperatures. WE suggest that the the origin of the observed effect stems from the REversal of PRE by electron Spin SaturatION (REPRESSION) effect which was traced to the shortening of the electron phase memory time, Tm, with electron spin bath saturation by microwave irradiation.