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February 21, 2016
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Date:11TuesdayFebruary 2020Lecture
A common neuronal mechanism underlying free and creative behavior in the human brain
More information Time 12:30 - 12:30Location Gerhard M.J. Schmidt Lecture HallLecturer Prof. Rafael Malach
Dept of Neurobiology, WISOrganizer Department of Brain SciencesContact Abstract Show full text abstract about Free behavior is likely the most fundamental and essential a...» Free behavior is likely the most fundamental and essential aspect of human life. It underlies our unique ability to self-generate actions and come up with creative and original solutions. Yet, the brain mechanism that drives such free and creative behaviors remains unknown. In my talk I will present experimental findings supporting the hypothesis that ultra-slow spontaneous (resting state) activity fluctuations are a central and ubiquitous mechanism underlying all types of free behavior. Traces of slow resting state fluctuations can account for the intriguing observation that free behaviors of all types- from generating names to free recall of visual images- are invariably preceded by a wave of slow (1-4 seconds) activity buildup. This buildup can be observed in BOLD-fMRI, intracranial recording of single neurons and more recently, in the massive hippocampal bursts called Sharp Wave Ripples. Could the similar slow dynamics of the spontaneous fluctuations and the anticipatory buildup preceding free behaviors be a mere coincidence? Crucially, I will present evidence that individual differences in the waveforms of spontaneous fluctuations measured during are significantly correlated to the shape of the buildup wave anticipating free and creative events. The critical role of spontaneous activity fluctuations in generating creative decisions is reminiscent of the use of stochastic noise in optimizing solutions in network models.
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Date:12WednesdayFebruary 2020Lecture
Developmental Club Series 2019-20
More information Time 10:00 - 10:00Title Visualizing neural activity: from intracellular signaling to whole-brain network From whole-brain landscape to millisecond dynamicsLocation Arthur and Rochelle Belfer Building for Biomedical ResearchLecturer Dr. Takashi Kawashima Organizer Department of Molecular GeneticsContact -
Date:12WednesdayFebruary 2020Lecture
Exciton and trions in Van der Waals materials and their dynamics under different non-uniform strain configurations
More information Time 11:00 - 12:00Location Gerhard M.J. Schmidt Lecture HallLecturer Dr. Moshe Harats
Faculty of Physics, Freie University BerlinOrganizer Department of Molecular Chemistry and Materials ScienceContact Abstract Show full text abstract about Abstract: In recent years, Van der Waals (2D) materials, ha...» Abstract:
In recent years, Van der Waals (2D) materials, have attracted increasing attention due to their distinctive physical properties. As layered materials, they have been considered for flexible electronics as they can sustain strain higher than 10% without breaking down, although they are only 1-3 atom thick. Their superior mechanical properties led to a renewed interest in the mechanics of thin membranes linked to condensed matter physics. In this talk we will show how we can apply non-uniform strain to a suspended Van der Waals material (WS2) and alter the dynamics of excitons and trions. Surprisingly, we find that as we increase the non-uniformity of the strain, we are able to convert the excitons into trions with almost 100% efficiency without any electrostatic gating. Our results explain inconsistencies in previous experiments and pave the way towards new types of optoelectronic devices.
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Date:12WednesdayFebruary 2020Lecture
Optics, Vision, and Evolution, after Mitchell Feigenbaum 1944-2019
More information Time 11:00 - 11:00Location Edna and K.B. Weissman Building of Physical SciencesLecturer Jean-Pierre Eckmann
University of Geneva, MathematicsOrganizer Clore Center for Biological PhysicsContact Abstract Show full text abstract about Many people are aware of Feigenbaum's astonishing disco...» Many people are aware of Feigenbaum's astonishing discovery of the universality of period doubling, and the constant delta=4.66920 which carries his name.
In the last 13 years of his life Feigenbaum worked on other subjects, and he wrote the manuscript (in TeX) of a book whose title is "Reflections on a Tube".
This is closely related to his life-long interest in optics and aspects of vision. It deals with the optics of images reflected in a cylindrical mirror (usually called anamorphic pictures). He shows that the eye does not interpret ray-tracing, but caustics. But there are two caustics, and therefore, the viewer can actually see two different images. The visual system will often prefer one over the other. The question is the "which" and "why"? Starting from this discovery, Feigenbaum derived other aspects of this observation, dealing with the vision of fish, the "broken" pencil in water, or aspects of the floor of swimming pools. All these examples show two possible images. His study tells me how a simple study in classical optics can lead to interesting questions in perception and the visual system.
I will give an overview of this project. As I discussed with him, over those 13 years, many aspects of his work, I have edited his manuscript so it can be published as a book which should appear in a forseeable future.
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Date:12WednesdayFebruary 2020Lecture
Special Guest Seminar with Prof. Detlef Wiegel
More information Time 11:30 - 12:30Title “Epistasis; the spice of life (and evolution): Lessons from the plant immune system”Location Nella and Leon Benoziyo Building for Biological SciencesLecturer Prof. Detlef Wiegel
Executive Director, Max Plank Institute for Developmental BiologyOrganizer Department of Molecular GeneticsContact -
Date:12WednesdayFebruary 2020Lecture
Locomotion by shape control in nature and technology
More information Time 15:00 - 15:00Location Edna and K.B. Weissman Building of Physical SciencesLecturer Antonio DeSimone Organizer Clore Center for Biological PhysicsContact -
Date:13ThursdayFebruary 2020Lecture
Evolutionary genetics of microbe-plant symbioses: lessons from “Rhizobium leguminosarum – Vavilovia formosa
More information Time 09:15 - 09:15Location Nella and Leon Benoziyo Building for Biological SciencesLecturer Prof. Nikolai A. Provorov
Doctor of Biological Sciences, Director of All-Russia Research Institute for Agricultural Microbiology, Saint-Petersburg, RussiaOrganizer Department of Plant and Environmental SciencesContact -
Date:13ThursdayFebruary 2020Lecture
Interrelations between plant root exudation, tolerance to stresses and response to rhizobacteria
More information Time 09:45 - 09:45Location Nella and Leon Benoziyo Building for Biological SciencesLecturer Prof. Andrey A. Belimov
Doctor of Biological Sciences, Head of the Laboratory of Rhizospheric Microflora. All-Russia Research Institute for Agricultural Microbiology, Saint-Petersburg, RussiaOrganizer Department of Plant and Environmental SciencesContact -
Date:13ThursdayFebruary 2020Lecture
Seminar for thesis defense - Karen Fridman Talmon
More information Time 10:00 - 11:00Title “Functional analysis of RPTPs Lar and PTP69D and their contribution for the formation of postsynaptic sites at the neuromuscular junction”Location Arthur and Rochelle Belfer Building for Biomedical ResearchLecturer Karen Fridman Talmon Organizer Department of Molecular GeneticsContact -
Date:13ThursdayFebruary 2020Lecture
M.Sc thesis defense: "The origin of anharmonic atomic motion in halide perovskite crystals"
More information Time 10:00 - 11:00Location Perlman Chemical Sciences BuildingOrganizer Department of Molecular Chemistry and Materials ScienceContact Abstract Show full text abstract about Halide perovskites (ABX3) attracted much of attention in the...» Halide perovskites (ABX3) attracted much of attention in the last years due to their excellent photovoltaic activity. They are unique in the sense that they exhibit long carrier lifetime despite having many apparent structural defects. Recent studies in our group concluded that this unique behavior is due to strong coupling between the electronic band structure and the strongly anharmonic motion of the atoms within the crystal. Therefore, it is imperative to understand the source of anharmonic atomic motion in this class of materials. Studies have indicated the B-cation lone pair to be a possible source for strong anharmonic behavior in the perovskite crystals. In order to understand the anharmonic behavior and its origin, I investigated a series of perovskites with different lone pair stereoactivity. Using low frequency Raman spectroscopy, I quantified the level of anharmonicity and determined the influence of the B-cation lone pair on the structural dynamics.
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Date:13ThursdayFebruary 2020Colloquia
Highly magnified gravitationally lensed stars as a probe to the nature of dark matter
More information Time 11:15 - 12:30Location Edna and K.B. Weissman Building of Physical SciencesLecturer Jordi Miralda-Escude
Universitat de BarcelonaOrganizer Faculty of PhysicsContact Abstract Show full text abstract about Dark matter continues to pose one of the most important ques...» Dark matter continues to pose one of the most important questions in modern cosmology. Gravitationally lensed multiple images of galaxies, quasars and stars provide several opportunities for testing the clumpiness of dark matter on small scales due to, for example, compact objects, axion mini-clusters and waves, or subhalos orbiting on galactic or cluster dark matter halos. The idea of using highly magnified stars by lensing clusters to probe this small-scale granularity in the dark matter will be discussed.
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Date:13ThursdayFebruary 2020Lecture
What can the femur tell us about human behavior and health?
More information Time 11:30 - 12:30Location Nella and Leon Benoziyo Building for Biological SciencesLecturer Samuel Francis
Department of Anatomy and Anthropology, Sackler Faculty of Medicine, Tel Aviv UniversityOrganizer Academic Educational ResearchContact Abstract Show full text abstract about Physical anthropologists have long used skeletal remains to ...» Physical anthropologists have long used skeletal remains to recreate the lifestyles of past populations; thus, the understanding of long bones and their properties is a central challenge in the field. Though the femur and thigh muscles have the potential to give insight into a wide array of characteristics due to their size and central role in movement, the association between thigh muscle force and femoral bone morphology is unclear. Using medical CT images, the aim of this study was to reveal the associations between the cross-sectional area (a surrogate for muscle force) of the thigh muscles and the cross-sectional geometry of the femoral bone. This study will have implications for anthropological research, providing better information for inferring physical load from skeletal remains. -
Date:13ThursdayFebruary 2020Lecture
Prof. Ehud Ahissar - What is, actually, science?
More information Time 12:00 - 12:00Title What is, actually, science?Location Dolfi and Lola Ebner AuditoriumLecturer Prof. Ehud Ahissar Organizer Communications and Spokesperson DepartmentHomepage Contact -
Date:13ThursdayFebruary 2020Lecture
“What can covalent inhibitors do for YOU?"
More information Time 14:00 - 15:00Location Max and Lillian Candiotty BuildingLecturer Prof. Nir London Organizer Department of Immunology and Regenerative BiologyContact -
Date:13ThursdayFebruary 2020Lecture
Pelletron meeting - by invitation only
More information Time 16:00 - 17:30Contact -
Date:16SundayFebruary 2020Lecture
Departmental Seminar by Sagie Brodsky & Noa Novershtern
More information Time 13:00 - 13:00Location Arthur and Rochelle Belfer Building for Biomedical ResearchOrganizer Department of Molecular GeneticsContact -
Date:16SundayFebruary 2020Lecture
Shaping liquid droplets and elastic membranes
More information Time 13:15 - 13:15Location Edna and K.B. Weissman Building of Physical SciencesLecturer Zvonimir Dogic
UCSBOrganizer Clore Center for Biological PhysicsContact Abstract Show full text abstract about We describe two self-assembly pathways observed in micron-th...» We describe two self-assembly pathways observed in micron-thick colloidal membranes that spontaneously assemble in mixtures of monodisperse colloidal rods and non-adsorbing polymer. In a first example, we study mechanisms by which membrane-embedded 2D liquid droplets acquire unusual non-spherical shapes, suggesting that the interfacial edge domain has spontaneous non-zero edge curvature. These experimental observations can be explained by a simple geometric argument which predicts that the edge curvature towards shorter rod domains softens the resistance of the edge to twist. In a second example, we study the 3D structure of membranes composed of miscible rod-like molecules of differing lengths. Above a critical concentration of shorter rods flat 2D membranes become unstable and assume a bewildering variety of different shapes and topologies. Simple arguments suggest that doping colloidal membranes with miscible shorter rods tunes the membrane’s Gaussian modulus, which in turn destabilizes flat 2D membranes. -
Date:17MondayFebruary 2020Conference
IPS20
More information Time 08:00 - 08:00Location Michael Sela AuditoriumChairperson Gilad PerezOrganizer Faculty of Physics -
Date:17MondayFebruary 2020Colloquia
2D Polymers: Synthesis in Single Crystals and on Water
More information Time 11:00 - 12:15Location Gerhard M.J. Schmidt Lecture HallOrganizer Faculty of ChemistryContact -
Date:18TuesdayFebruary 2020Lecture
To be announced-Reserved
More information Time 10:00 - 10:30Location Nella and Leon Benoziyo Building for Biological SciencesOrganizer Department of Biomolecular SciencesContact