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אוקטובר 01, 2009
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Date:27ראשוןדצמבר 2009הרצאה
"Luminescent Solar Concentrators with efficiency exceeding 10%"
More information שעה 11:00 - 11:00מיקום בניין משפחת זוסמןמרצה Dr. Carmel Rotschild
Electrical Engineering Department, MIT, Massachusetts Institute of Technology.מארגן המחלקה למדעי כדור הארץ וכוכבי הלכתצרו קשר -
Date:27ראשוןדצמבר 2009הרצאה
Phylogenetic Tree Reconstruction with Insertions and Deletions
More information שעה 11:00 - 11:00מיקום בניין יעקב זיסקינדמרצה Avinatan Hassidim
M.I.T.מארגן הפקולטה למתמטיקה ומדעי המחשב -
Date:27ראשוןדצמבר 2009הרצאה
Continuum models for membrane dynamics
More information שעה 11:00 - 11:00מיקום בניין פרלמן למדעי הכימיהמרצה Prof. Frank Brown
Department of Chemistry and Biochemistry Department of Physics University of California Santa Barbara, CA, USAמארגן המחלקה לכימיה מולקולרית ולמדע חומריםצרו קשר תקציר Show full text abstract about Simulation of biomembranes and model membrane systems over l...» Simulation of biomembranes and model membrane systems over length and time scales relevant to cellular biology is not currently feasible with Molecular Dynamics or related atomically-detailed methods. Barring an unforeseen revolution in the computer industry, this situation will not change for several decades. Two aspects of membrane dynamics will be discussed: out-of-plane membrane undulations and in-plane flow/diffusion in inhomogeneous membrane systems. Both problems are treated within the context of continuum models, which allow access to length and time scales up to and beyond the micron and second regimes, using simple numerical methods. A number of effects relevant to the motion of integral membrane proteins as well as the dynamics of phase separation and domain fluctuations in multi-component lipid bilayers will be presented. -
Date:27ראשוןדצמבר 2009הרצאה
Equilibrium Configurations of Synchronous Binaries and Applications to the Kuiper Belt
More information שעה 12:30 - 14:00מיקום בניין הפיזיקה ע"ש עדנה וק.ב. וייסמןמרצה O. Gnat
Caltechמארגן מרכז לאסטרופיזיקה עש נלה וליאון בנוזיוצרו קשר תקציר Show full text abstract about The equilibrium configurations of rotating fluid masses is a...» The equilibrium configurations of rotating fluid masses is a classical problem first studied by Newton in the context of the figure of the Earth. Equilibrium configurations for synchronous, uniform, binary systems were computed by Roche, under the assumption that the resulting configurations are ellipsoids orbiting in a Keplerian orbit. In modern astrophysical research these classical Roche ellipsoidal solutions are used in the study of a wide range of contact binaries, including binaries in the Kuiper belt. In this talk, I will describe the classical analytical approximations, and I will then present exact numerical computations of the equilibrium configurations of synchronous binaries, self-consistently taking into account the tidal and rotational deformations of both components, and relaxing the assumptions of ellipsoidal configurations and Keplerian rotation. The numerical models
result in non-ellipsoidal configurations in non-Keplerian orbits, but indicate that the analytical ellipsoids are, in most cases, a fair approximation. I will show the light curves resulting from the numerically computed equilibrium configurations, and compare these light curves with those computed using the
Roche approximations. Finally, I will demonstrate how these models can be
used to infer the physical properties of observed Kuiper Belt binaries by fitting the observed light curve of QG298. -
Date:27ראשוןדצמבר 2009הרצאה
"Functional SDF-1 Secretion from Bone Marrow Stromal Cells is a Cell Contact-Dependent Event Mediated by Cx43 and Cx45 Gap-Junctions via Calcium and cAMP signaling"
More information שעה 13:30 - 13:30מיקום בניין וולפסון למחקר ביולוגימרצה Amir Schajnovitz
Tzvee Lapidot's labמארגן המחלקה לאימונולוגיה מערכתיתצרו קשר -
Date:27ראשוןדצמבר 2009הרצאה
Exponential Logarithmic Series
More information שעה 16:00 - 16:00מיקום בניין יעקב זיסקינדמרצה Salma Kuhlmann
University of Konstanzמארגן הפקולטה למתמטיקה ומדעי המחשב -
Date:28שנידצמבר 2009סימפוזיונים
The Amazing Ribosome
More information שעה 09:30 - 09:30מיקום אודיטוריום מיכאל סלעמרצה 2009 Nobel Prize in Chemistry Laureate, Prof. Ada Yonath
Dept. of Structural Biology, WISמארגן הפקולטה לכימיהצרו קשר -
Date:28שנידצמבר 2009הרצאה
Phylogenomics and Darwin's Coral-of-Life in Light of Horizontal Gene Transfer
More information שעה 11:00 - 12:00מיקום בניין ארתור ורושל בלפר למחקר ביורפואימרצה Professor J. Peter Gogarten
University of Connecticutדף בית צרו קשר תקציר Show full text abstract about Comparative genomics has provided many new insights into mic...» Comparative genomics has provided many new insights into microbial evolution. One of the surprises was the extent of horizontal gene transfer. In some respects gene transfer made understanding life’s history more difficult –phylogeny can no longer be described as a single steadily furcating tree-; however, the study of horizontal gene transfer also illustrates how new metabolic pathways are created, and in many instances transferred genes turned out to be excellent markers for cladistic classification. The seminar will discuss and illustrate Darwin's proposal to rename the Tree-of Life into the Coral-of-Life, the role of gene transfer from now extinct lineages, and the application of population genetic principles to higher taxonomic units. -
Date:28שנידצמבר 2009הרצאה
The wildfire problem of the United States: people, houses, and lightning
More information שעה 11:00 - 11:00מיקום בניין משפחת זוסמןמרצה Avi Bar Massada
Postdoctoral Research Associate Department of Forest and Wildlife Ecology University of Wisconsinמארגן המחלקה למדעי כדור הארץ וכוכבי הלכתצרו קשר -
Date:28שנידצמבר 2009הרצאה
Controlling fate, motility and directed migration of germ cells in zebrafish
More information שעה 13:00 - 13:00מיקום בניין ארתור ורושל בלפר למחקר ביורפואימרצה Dr. Erez Raz
Institute of Cell Biology, ZMBE, Munster, Germanyצרו קשר -
Date:28שנידצמבר 2009הרצאה
Correlation functions of spin chains
More information שעה 14:15 - 14:15מיקום בניין הפיזיקה ע"ש עדנה וק.ב. וייסמןמרצה F. Goehmann, Univ of Wuppertal מארגן המחלקה לפיזיקה של מערכות מורכבותצרו קשר תקציר Show full text abstract about I describe the results of a long term project on the calcul...» I describe the results of a long term project on the
calculation and clarification of the mathematical structure of the
correlation functions of integrable systems. Our main model system
in this context is the XXZ spin chain which includes several interesting
relativistic and non-relativistic 1+1d quantum field theories as scaling
limits and also appears as a model for highly anisotropic magnetic
materials in solid state physics. Recently, it was established that
the static correlation functions of the XXZ-chain all factorize
(T. Miwa, M. Jimbo and F. Smirnov, arXiv:0811.0439) under rather general
conditions. This means that all correlation functions can be expressed
in terms of the one-point function and a special neighbour two-point
function (which may be understood as a kind of Wick theorem for an
interacting system). Those functions admit an efficient description
by means of linear and non-linear integral equation (H. Boos and F.
G\"ohmann, arXiv:0903.5043) which, in turn allows us to calculate
short-range correlation functions for the spin chain, say, at finite
temperature, in the thermodynamic limit with arbitrary numerical
precision (e.g. C. Trippe, F. G\"ohmann and A. Kl\"umper arXiv:0908.2232
and arXiv:0912.1739).
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Date:28שנידצמבר 2009הרצאה
Relations in algebraic complexity
More information שעה 14:30 - 14:30מיקום בניין יעקב זיסקינדמרצה Amir Yehudayoff
Institute for Advanced Studyמארגן הפקולטה למתמטיקה ומדעי המחשב -
Date:28שנידצמבר 2009הרצאה
Dr. Chaim Weizmann's Annual Memorial Lecture
More information שעה 20:00 - 22:00מרצה Prof. Avishai Margalit
Prof. Avishai Margalit is awarded the 2007 EMET Prize for his original and influential contribution in the fields of political thought, ethics and the philosophy of religion, and for his works dealing with the complex moral and political issues of this day and age. All these have made him one of the most important philosophers in Israel and abroad.מארגן יד חיים וייצמןצרו קשר -
Date:28שנידצמבר 2009אירועי תרבות
The Israel Ballet-"Sleeping Beauty"
More information שעה 20:30 - 20:30צרו קשר -
Date:29שלישידצמבר 2009הרצאה
Visualizing molecular processes within a bacterium
More information שעה 10:00 - 10:00מיקום בניין וולפסון למחקר ביולוגימרצה Dr. Sigal Ben-Yehuda
Microbiology and Molecular Genetics Faculty of Medicine, Hebrew Universityמארגן המחלקה למדעים ביומולקולרייםצרו קשר -
Date:29שלישידצמבר 2009הרצאה
Qualitative properties of second-order quasi-linear elliptic and parabolic equations
More information שעה 10:00 - 10:00מיקום Room 229 (Pekeris Room)מרצה Prof. Vitali Liskevich
Swansea Universityמארגן הפקולטה למתמטיקה ומדעי המחשב -
Date:29שלישידצמבר 2009הרצאה
"Stormwater harvesting & recycling filtration & Biofiltration systems for aquifer recharge in Israel"
More information שעה 11:00 - 12:00מיקום בניין אולמן למדעי החייםמרצה Dr. Yaron Zinger
Facility for Advancing Water Biofiltration (FAWB) Institute for Susatainable Water Resources Dept. of Civil Engineering Monash University, Victoria, Australiaמארגן המחלקה למדעי הצמח והסביבהצרו קשר -
Date:29שלישידצמבר 2009הרצאה
"Metallic nano-clusters on oxide substrate as model catalyst"
More information שעה 11:00 - 11:00כותרת Organic Chemistry - Departmenal Seminarמיקום בניין הלן ומילטון קימלמןמרצה Dr. Elad Gross
The Institute of Chemistry The Hebrew University of Jerusalemמארגן המחלקה לכימיה מולקולרית ולמדע חומריםצרו קשר -
Date:29שלישידצמבר 2009הרצאה
New Insights in MAPK signaling in living cells
More information שעה 12:15 - 12:15מיקום בניין וולפסון למחקר ביולוגימרצה Cellina Cohen-Saidon מארגן המחלקה לביולוגיה מולקולרית של התאצרו קשר תקציר Show full text abstract about Cells can respond to various stimulations by changing the lo...» Cells can respond to various stimulations by changing the localization of signaling proteins. One can imagine this as a computation, in which the dynamics of the signaling molecules in the cell represent the input signals. Using live-imaging of individual living cells, we follow the dynamic nuclear accumulation of the ERK2 protein of the MAPK signal transduction pathway upon stimulation with epidermal growth factor (EGF). We show that part of this computation of the response has a feature named fold-change response. The flow of information is further processed by yet unknown cellular mechanisms in a fold-change manner, suggesting that the ERK2 system compensates for natural biological noise despite large variation in nuclear basal levels.
Theoretical studies indicate that the fold-change response can be explained by one of the most common network motifs in topological networks, the incoherent feed-forward loop (I1-FFL). The fold-response feature of the I1-FFL applies to the entire shape of the response, including its amplitude and duration. Fold-response can help buffer cell-to-cell variation in the level of regulatory proteins, and help overcome noise in the signal. This provides a view of this signaling pathway at the individual cell level and suggests that fold rather than absolute changes in nuclear level characterize the response of this pathway.
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Date:29שלישידצמבר 2009הרצאה
PKMzeta and the core molecular mechanism of long-term memory storage and erasure
More information שעה 12:30 - 12:30מיקום בניין יעקב זיסקינדמרצה Prof. Todd Sacktor
SUNY Downstate Medical Center, Brooklyn, NYמארגן המחלקה למדעי המוחצרו קשר תקציר Show full text abstract about How long-term memories are stored as physical traces in the ...» How long-term memories are stored as physical traces in the brain is a fundamental question in neuroscience. Most molecular work on LTP, a widely studied physiological model of memory, has focused on the early signaling events regulating new protein synthesis that mediates initial LTP induction. But what are the newly synthesized proteins that function in LTP maintenance, how do they sustain synaptic potentiation, and do they store long-term memory? Recent studies have identified a brain-specific, autonomously active, atypical PKC isoform, PKMzeta, that is central to the mechanism maintaining the late phase of LTP. In behavioral experiments, the persistent activity of PKMzeta maintains spatial memories in hippocampus, fear-motivated memories in amygdala, and, in work performed in the Dudai lab, elementary associative memories in neocortex. This is because 1-day to several month-old memories appear to be rapidly erased after local intracranial PKMzeta inhibition. PKMzeta, a persistently active enzyme, is thus the first identified molecular component of the long-term memory trace.