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ספטמבר 12, 2011
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Date:19שלישייוני 2012הרצאה
MECHANICS AT THE NANO SCALE
More information שעה 10:30 - 12:00מיקום Neve Shalomמרצה RON LIFSHITZ
RAYMOND AND BEVERLY SACKLER SCHOOL OF PHYSICS AND ASTRONOMY TEL AVIV UNIVERSITYמארגן המחלקה לפיזיקה של חלקיקים ואסטרופיזיקהצרו קשר תקציר Show full text abstract about Vigorous research in nanoscience and nanotechnology is expec...» Vigorous research in nanoscience and nanotechnology is expected to lead to exciting new applications, but considering that the first person to envision science at the nano scale was one of the greatest theoretical physicists of the last century, one should wonder whether we can expect to see any new physics emerging from this activity as well. I will attempt to answer this question by reviewing some exciting developments in the field of nanomechanics, emphasizing my particular interests, ranging from classical nonlinear dynamics, through mesoscopic physics of phonons, to the ultimate limit of QEM (quantum electromechanics). -
Date:19שלישייוני 2012הרצאה
Asymmetric Grow-Up Equations and their Non-Compact Global Attractors
More information שעה 11:00 - 11:00מיקום בניין יעקב זיסקינדמרצה Nitsan Ben Gal
מארגן הפקולטה למתמטיקה ומדעי המחשבצרו קשר -
Date:19שלישייוני 2012הרצאה
"Selenocysteine as a tool to study protein chemistry"
More information שעה 11:00 - 11:00כותרת Organic Chemistry - Departmental Seminarמיקום בניין הלן ומילטון קימלמןמרצה Dr. Norman Metanis
Laboratory of Organic Chemistry, ETH Zürich, Switzerlandמארגן המחלקה לכימיה מולקולרית ולמדע חומריםצרו קשר תקציר Show full text abstract about Abstract. Selenocysteine is the 21st encoded amino acid, ...» Abstract.
Selenocysteine is the 21st encoded amino acid, found in several selenoproteins, most of which are redox selenoenzymes. Its resemblance to cysteine enabled its use for protein chemical synthesis and mechanistic studies. As they belong to the same group of elements in the periodic table, sulfur and selenium share many features including similar size, electronegativity and major oxidation states. However they differ in other properties, for example, selenium compounds are easier to oxidize and show greater electrophilic character. The selenium atom is also more polarizable than sulfur, so selenols are softer nucleophiles than thiols. Because selenols are substantially more acidic (ΔpKa ~3), selenocysteine is ionized at physiological pH, further enhancing its reactivity relative to cysteine. These properties make selenocysteine a valuable building block for constructing peptides and proteins with novel properties and as a tool for protein synthesis and folding studies. For example, native chemical ligation at selenocysteine followed by selective deselenization will enable chemical synthesis of proteins without protecting groups on cysteine residues. Additionally, targeted insertion of a non-native diselenide cross-link into a cysteine-rich protein can be exploited to direct the early stages of oxidative folding so as to avoid accumulation of unproductive intermediates that limit folding efficiency. This novel strategy could facilitate the production of many difficult-to-fold peptides and proteins. Results from
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Date:19שלישייוני 2012סימפוזיונים
What are Majoranas and where to find them at the Weiz-mann Institute
More information שעה 11:15 - 12:30מיקום בניין הפיזיקה ע"ש עדנה וק.ב. וייסמןמרצה Prof. Yuval Oreg
Weizmann Institute of Scienceמארגן הפקולטה לפיזיקהצרו קשר תקציר Show full text abstract about Topological quantum computation provides an elegant way arou...» Topological quantum computation provides an elegant way around decoherence, as one encodes quantum information in a nonlocal fashion that the environment finds difficult to corrupt. Zero energy Majorana Fermion states (Majorans for
short) emerges as a key concept for a realization of nonlocal encoding. In this talk we will discuss what are Majoranas? What makes them nonlocal? and how one may create and manipulate them. We will discuss recipes for driving semiconduct-ing wires into a topological phase supporting Majoranas at the wires ends, and re-cent experimental observations at the Weizmann institute. Theoretically, in this setting Majoarans can be transported, created, and fused by applying locally tuna-ble gates to the wire. More importantly, we will show that networks of such wires allow braiding of Majoranas exhibiting non-Abelian statistics. -
Date:19שלישייוני 2012הרצאה
"How biomass is born: understanding cellulose synthesis for second generation Biofuels"
More information שעה 11:15 - 11:15מיקום בניין אולמן למדעי החייםמרצה Dr. Nadav Sorek
Energy Biosciences Institute, University of California, Berkeley, USAמארגן המחלקה למדעי הצמח והסביבהצרו קשר -
Date:19שלישייוני 2012הרצאה
TBA
More information שעה 12:00 - 13:30מיקום Neve Shalomמרצה MATAN FIELD
WEIZMANN INSTITUTE OF SCIENCEמארגן המחלקה לפיזיקה של חלקיקים ואסטרופיזיקהצרו קשר -
Date:19שלישייוני 2012הרצאה
New solutions to the "solved" problem of how sodium channels control cortical neuronal excitability
More information שעה 12:30 - 12:30מיקום אולם הרצאות ע"ש גרהרד שמידטמרצה Prof. Mike Gutnick
Veterinary Medicine, Faculty of Agriculture, Hebrew University of Jerusalemמארגן המחלקה למדעי המוחצרו קשר תקציר Show full text abstract about 60 years ago, Hodgkin and Huxley published their seminal pap...» 60 years ago, Hodgkin and Huxley published their seminal papers which described the kinetics of voltage-gated ionic currents in the squid giant axon and used these measurements to produce the fundamental model of action potential generation. Their findings have become the basis for our understanding of neuronal excitability and information processing and are central to computational models of neuronal function. However, it turns out that the precise activation and inactivation characteristics of voltage-gated sodium channels in the CNS can vary widely, not only depending on the brain region, cell type and molecular subunit, but also as a function of the location of channels within the neuron and their relationship to the local membrane cytoskeleton. These differences in current properties can have a profound functional impact. I will discuss our data on transient and persistent sodium currents in the various compartments of the cortical pyramidal neuron, collected in brain slices using whole-cell current and on-cell single channel recordings and imaging of sodium-sensitive fluorescent dyes. -
Date:19שלישייוני 2012אירועי תרבות
כיצד בונים תזמורת?
More information שעה 17:30 - 17:30כותרת תזמורת סימפונט רעננהמיקום אודיטוריום מיכאל סלעצרו קשר -
Date:19שלישייוני 2012הרצאה
קפה מדע
More information שעה 19:30 - 21:00מיקום מכון דוידסון לחינוך מדעימארגן יחידת שוהם במכון דוידסוןדף בית צרו קשר -
Date:20רביעייוני 2012הרצאה
Kinetic Luminosity of Quasar Outflows and its Implications to AGN Feedback: HST/COS Observations
More information שעה 11:15 - 11:15מיקום בניין הפיזיקה ע"ש עדנה וק.ב. וייסמןמרצה Nahum Arav, Virginia Tech מארגן מרכז לאסטרופיסיקה עש נלה וליאון בנוזיוצרו קשר תקציר Show full text abstract about Sub-relativistic outflows are seen as blueshifted absorption...» Sub-relativistic outflows are seen as blueshifted absorption
troughs in the spectra of roughly one third of all quasars. I will
describe a recent breakthrough, enabled by HST/COS observations, that
yield the mass flux and kinetic luminosity for the majority of
these outflows. The derived values suggest that quasar
absorption outflows have a profound effect on the host galaxy.
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Date:20רביעייוני 2012הרצאה
Polycomb and chromosome architecture in fly development
More information שעה 11:30 - 11:30מיקום בניין ארתור ורושל בלפר למחקר ביורפואימרצה Dr. Giacomo Cavalli
Institute of Human Genetics, CNRS, Franceמארגן המחלקה לאימונולוגיה מערכתיתדף בית צרו קשר -
Date:20רביעייוני 2012הרצאה
POPULAR LECTURES - IN HEBREW
More information שעה 12:00 - 12:00מיקום אולם ע"ש דולפי ולולה אבנרמרצה Prof. Atan Gross צרו קשר -
Date:20רביעייוני 2012אירועי תרבות
מנחה מוזיקלית
More information שעה 12:30 - 13:30כותרת פניני אופרהמיקום אודיטוריום מיכאל סלעצרו קשר -
Date:21חמישייוני 2012הרצאה
שחרור כספי גמל ופיצויים - מדענים
More information שעה 09:00 - 13:00מיקום מועדון סן מרטין; בית הארחה על-שם הרמן מאיר. בית צרפתמארגן אגף משאבי אנושצרו קשר -
Date:21חמישייוני 2012הרצאה
Role of SHIP in Cancer, Mucosal Inflammation and Stem Cells
More information שעה 11:00 - 11:00מיקום בניין וולפסון למחקר ביולוגימרצה Prof. William G. Kerr (PhD)
Upstate Medical University Biochemistry and Molecular Biologyמארגן המחלקה לאימונולוגיה מערכתיתצרו קשר -
Date:21חמישייוני 2012הרצאה
Biological robustness and the role of microRNAs
More information שעה 13:00 - 13:00מיקום בניין ארתור ורושל בלפר למחקר ביורפואימרצה Dr. Richard Carthew
Northwestern University, Evanston, USAצרו קשר -
Date:21חמישייוני 2012הרצאה
Brain-to-brain coupling:a mechanism for creating and sharing a social world
More information שעה 14:30 - 14:30מיקום בניין לחקר המוח על-שם נלה וליאון בנוזיומרצה Prof. Uri Hasson
Dept of Psychology, Princeton Universityמארגן המחלקה למדעי המוחצרו קשר תקציר Show full text abstract about Cognition materializes in an interpersonal space. The emerge...» Cognition materializes in an interpersonal space. The emergence of complex behaviors requires the coordination of actions among individuals according to a shared set of rules. Despite the central role of other individuals in shaping our minds, experiments typically isolate human or animal subjects from their natural environment by placing them in a sealed quiet room where interactions occur solely with a computer screen. In everyday life, however, we spend most of our time interacting with other individuals. In the talk I will argue in favor of a shift from a single-brain to a multi-brain frame of reference. I will present a series of studies aimed at characterizing the brain-to-brain coupling during real life social interaction. The data suggest that in many cases the neural processes in one brain are coupled to the neural processes in another brain via the transmission of a signal through the environment. The brain-to-brain neural coupling exposes a shared neural substrate that exhibits temporally aligned response patterns across communicators. The recording of the neural responses from two brains opens a new window into the neural basis of interpersonal communication, and may be used to assess verbal and non-verbal forms of interaction in both human and other model systems.
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Date:21חמישייוני 2012הרצאה
Life Science Lecture
More information שעה 15:00 - 16:30כותרת Plant Immunity Strategiesמיקום אולם ע"ש דולפי ולולה אבנרמרצה Prof. Robert Fluhr
Department of Plant Sciences Weizmann Institute of Scienceצרו קשר -
Date:24ראשוןיוני 2012הרצאה
Identifying a new player in the regulation of mTOR and autophagy
More information שעה 13:00 - 13:00מיקום בניין ארתור ורושל בלפר למחקר ביורפואימרצה Yaara Ber
Adi Kimchi's group, Dept. of Molecular Genetics, WISמארגן המחלקה לגנטיקה מולקולריתצרו קשר -
Date:24ראשוןיוני 2012הרצאה
"Stochastic Time-Dependent Current-DFT: a functional theory of open quantum systems"
More information שעה 14:00 - 14:00מיקום בניין פרלמן למדעי הכימיהמרצה Prof. Massimiliano di Ventra
Department of Physics University of California, San Diegoמארגן המחלקה לכימיה מולקולרית ולמדע חומריםצרו קשר תקציר Show full text abstract about ”Standard” density-functional methods ...»
”Standard” density-functional methods can only deal with Hamiltonian dynamics, and not with open quantum systems, namely systems dynamically coupled to baths/reservoirs. There is, however, a large class of physics problems where one needs to consider this interaction explicitly. These include energy relaxation and dephasing due to an environment, non-radiative decay, quantum measurement theory, etc. In order to address these issues, we have introduced a new theory we have named Stochastic TD-CDFT [1,2] and extended it to the correlated motion of electrons and ions [3,4]. I will describe this theory in detail, its range of applicability, and show some applications with and without ionic motion, in particular those related to energy transport in nanoscale systems [5,6].
[1] M. Di Ventra and R. D'Agosta, Stochastic Time-Dependent Current-Density-Functional Theory, Phys. Rev. Lett. 98, 226403 (2007).
[2] R. D’Agosta and M. Di Ventra, Stochastic Time-Dependent Current-Density-Functional Theory: a functional theory of open quantum systems, 78, 165105 (2008).
[3] H. Appel and M. Di Ventra, Stochastic Quantum Molecular Dynamics, Phys. Rev. B 80, 212303 (2009).
[4] H. Appel and M. Di Ventra, Stochastic quantum molecular dynamics for finite and extended systems, Chem. Phys. 381, 27 (2011).
[5] Y. Dubi, M. Di Ventra, Thermoelectric effects in nanoscale junctions, Nano Lett. 9, 97 (2009).
[6] Y. Dubi and M. Di Ventra Energy flow and thermoelectricity in atomic and molecular junctions, Reviews of Modern Physics 83, 131 (2011).