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  • Date:19שניאפריל 2021

    Uncovering the Boundaries of Olfactory Perception

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    שעה
    15:00 - 16:00
    מרצה
    Aharon Ravia (PhD Thesis Defense)
    Prof. Noam Sobel Lab, Dept of Neurobiology Prof. David Harel Lab, Dept of Computer Science and Applied Mathematics WIS
    מארגן
    המחלקה לנוירוביולוגיה
    צרו קשר
    פרטים נוספיםShow full text description of Zoom link to join: https://weizmann.zoom.us/j/93360836031?pw...»
    Zoom link to join: https://weizmann.zoom.us/j/93360836031?pwd=dDZEdTQ1QUkxUVVONVErVm9CcUJWQT09

    Meeting ID: 933 6083 6031
    Password: 591230
    תקצירShow full text abstract about The question of how to measure a smell has troubled scientis...»
    The question of how to measure a smell has troubled scientists for over a century. It was none other than Alexander Graham Bell that raised the challenge: "we have very many different kinds of smells, all the way from the odor of violets and roses up to asafoetida. But until you can measure their likenesses and differences you can have no science of odor”. Such a measure of smell can be naturally derived from a model of olfactory perceptual quality space, and several such models have recently been put forth. These typically rely on finding mathematical rules that link odorant structure to aspects of odor perception.
    Here, I collected 49,788 perceptual odor estimates from 199 participants, and built such a model, finalizing a physicochemical measure of smell. This measure, expressed in radians, predicts real-world odorant pairwise perceptual similarity from odorant structure alone. Using this measure, I met Bell's challenge by accurately predicting the perceptual similarity of rose, violet and asafoetida, from their physicochemical structure. Next, based on thousands of comparisons, I identified a cutoff in this measure, below 0.05 radians, where discrimination between pairs of mixtures becomes highly challenging. To assess the usefulness of this measure, I investigated whether it can be used to create olfactory metamers, namely non-overlapping molecular compositions that share a common percept. Characterizing the link between physical structure and ensuing perception in vision and audition, and the creation of perceptual entities such as metamers, was important towards understanding their underlying dimensionality, brain mechanisms, and towards their ultimate digitization. I suggest that olfactory metamers can similarly aid these goals in olfaction.

    Zoom link to join: https://weizmann.zoom.us/j/93360836031?pwd=dDZEdTQ1QUkxUVVONVErVm9CcUJWQT09



    Meeting ID: 933 6083 6031
    Password: 591230
    הרצאה
  • Date:20שלישיאפריל 2021

    ILASOL 2021 Conference

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    שעה
    כל היום
    מיקום
    בניין ארתור ורושל בלפר למחקר ביורפואי
    Botnar Auditorium
    מארגן
    המחלקה לגנטיקה מולקולרית
    צרו קשר
    הרצאה
  • Date:20שלישיאפריל 2021

    The hydrological paradox - why the whole is less than the sum of its parts?

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    שעה
    כל היום
    מיקום
    https://weizmann.zoom.us/j/7621438333?pwd=c0lpdlQzYSthellXWG9rZnM0ZDRFZz09
    מרצה
    Erwin Zehe
    KIT
    מארגן
    המחלקה למדעי כדור הארץ וכוכבי הלכת
    צרו קשר
    תקצירShow full text abstract about Hydrological systems are inherently non-linear and exhibit a...»
    Hydrological systems are inherently non-linear and exhibit an enormous structural and functional heterogeneity. Strikingly, we can nevertheless successfully simulate stream flow generation and the water balance of river catchments with rather simple models that are largely incompatible with the frequently reported subscale process heterogeneity and non-linearity. Here we argue that subscale structural heterogeneity and randomness must not prevent the emergence of functional simplicity. On the contrary, we found simplicity to emerge at rather small scales, reflecting self-organization in hydrological functioning not despite but due to subscale small-scale heterogeneity and the dissipative nature of hydrological process. While we acknowledge that hydrological landscapes are heterogeneous, they are by no means a random product. Catchments exhibit a considerable spatial organisation, which manifests through structured patterns of topography, soil, vegetation, self-similar surface and subsurface drainage networks and most prominently through ubiquitous preferential flow phenomena. While this organized “catchment from” does strongly determine present storage, cycling and release of water, energy and chemical species, this catchment form has in turn been shaped by of water, energy, and nutrients of the past. Is this “co-evolution” just chance or manifested self-organization? This question has been inspiring many scientists to search for thermodynamic principles that link form and function in the Earth system. Here we will present evidence that a thermodynamic and information theoretic perspective opens up new avenues for (i) diagnosing and explaining self-organization in hydrological dynamics, (i) upscaling of constituting relations and (i) using thermodynamic optimality for hydrological predictions.
    הרצאה
  • Date:20שלישיאפריל 2021

    Clathrin-mediated endocytosis: From the textbook model toward understanding the biological diversity of the process

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    שעה
    10:00 - 11:00
    מיקום
    בניין לביוכימיה על שם נלה וליאון בנוזיו
    מרצה
    Prof. Marko Kaksonen
    Department of Biochemistry at the University of Geneva
    מארגן
    המחלקה למדעים ביומולקולריים
    צרו קשר
    תקצירShow full text abstract about Zoom LInk: https://weizmann.zoom.us/j/95881429481?pwd=Vkxw...»
    Zoom LInk:
    https://weizmann.zoom.us/j/95881429481?pwd=VkxwUmg1Z2ErZmhpZDJqMTZwellGZz09
    הרצאה
  • Date:20שלישיאפריל 2021

    New insights on continuous attractor neural networks

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    שעה
    12:30
    מרצה
    Prof. Yoram Burak
    Racah Institute of Physics and Edmond and Lily Safra Center for Brain Sciences The Hebrew University of Jerusalem
    מארגן
    המחלקה לנוירוביולוגיה
    צרו קשר
    פרטים נוספיםShow full text description of Zoom link to join- https://weizmann.zoom.us/j/96608033618?p...»
    Zoom link to join-
    https://weizmann.zoom.us/j/96608033618?pwd=SEdJUkR2ZzRBZ3laUUdGbWR1VFJTdz09

    Meeting ID: 966 0803 3618
    Password: 564068

    Host: Dr. Rita Schmidt rita.schmidt@weizmann.ac.il tel: 9070
    תקצירShow full text abstract about One of the most fundamental concepts in theoretical neurosci...»
    One of the most fundamental concepts in theoretical neuroscience is that of an attractor neural network, in which recurrent synaptic connectivity constraints the joint activity of neurons into a highly restricted repertoire of population activity patterns. In continuous attractor networks, these activity patterns span a continuous, low-dimensional manifold. I will survey two recent works from my group that are related to this concept. The first work is concerned with fixational eye drifts, a form of eye motion that occurs between saccades and is characterized by smooth, yet random, diffusive-like motion. This motion is tiny compared to saccadic eye motion, yet it is highly consequential for high-acuity vision. Even though fixational drift has been identified at least as early as the 19th century, its mechanistic origins have remained completely unknown. We hypothesize that the main drive for fixational drifts arises in diffusive motion along a line-attractor memory network - the oculomotor network, which is responsible for maintaining a fixed activation of the ocular muscles between saccades. I will present evidence in support of this hypothesis, coming from electrophysiology in monkeys and from theoretical modeling. The second work is concerned with the ability of a single recurrent neural network to express activity patterns that span multiple yet distinct continuous manifolds, a question that has been of interest in the context of spatial coding, across multiple environments, in area CA3 of the hippocampus.


    Zoom link to join-
    https://weizmann.zoom.us/j/96608033618?pwd=SEdJUkR2ZzRBZ3laUUdGbWR1VFJTdz09

    Meeting ID: 966 0803 3618
    Password: 564068
    Host: Dr. Rita Schmidt rita.schmidt@weizmann.ac.il tel: 9070
    הרצאה
  • Date:20שלישיאפריל 2021

    From light-harvesting to assembly: Modularity and heterogeneity in photosynthetic antenna systems

    More information
    שעה
    15:00 - 16:00
    כותרת
    Guest Seminar via Zoom
    מיקום
    https://weizmann.zoom.us/j/99097904761?pwd=MitYaVJjL0Y4OFU3NWRVeCtDNkkyZz09 Password 247214
    מרצה
    Dr. Hila Toporik
    School of Molecular Sciences/The Biodesign Institute, The Center for Applied Structural Discovery, Arizona State University
    מארגן
    המחלקה למדעי הצמח והסביבה
    צרו קשר
    פרטים נוספיםShow full text description of Host: Prof. Asaph Aharoni...»
    Host: Prof. Asaph Aharoni
    הרצאה
  • Date:22חמישיאפריל 2021

    Atmospheric Dynamics on Jupiter: New Results from the Juno Mission

    More information
    שעה
    11:15 - 12:30
    מיקום
    https://weizmann.zoom.us/j/94477142638?pwd=aWNlZGVzNmdJdnJVZVNZUi9sZ0VBZz09
    מרצה
    Yohai Kaspi
    WIS
    מארגן
    הפקולטה לפיסיקה
    צרו קשר
    תקצירShow full text abstract about NASA's Juno Mission is now completing its 5 year nomina...»
    NASA's Juno Mission is now completing its 5 year nominal mission around Jupiter, orbiting the planet in an eccentric polar-orbit every 53 days. One of the prime mission objectives is better understanding the atmospheric dynamics through gravitational, microwave, infrared and magnetic measurements. In this talk, we will focus on three new results explaining different aspects of the dynamics on Jupiter. First, infrared imaging data revealed that Jupiter’s poles are surrounded by 5 cyclones around the North Pole and 8 cyclones around the South Pole. We explain the location, size and stability of these circumpolar cyclones based on vorticity dynamics. Second, using microwave data, revealing Jupiter’s deep ammonia abundance structure, we show that Jupiter has 8 meridional circulation cells in each hemisphere. These cells resemble in their governing physics Earth's midlatitude Ferrel cells, and relate to the observed red and white belts and zones at Jupiter’s cloud-level. Finally, using Juno’s gravity measurements we constrain the depth of Jupiter’s east-west jet-streams, and the depth (mass) of the most iconic vortex in the Solar system — Jupiter’s Great Red Spot. Overall, this unique multiple instrument dataset allows now explaining the governing physics of several outstanding aspects of Jupiter’s internal and atmospheric dynamics. We will also compare the dynamics to those of Saturn, generalizing some of the this new understanding.
    סימפוזיונים
  • Date:22חמישיאפריל 2021

    Therapeutic Exploitation of Metabolic Vulnerabilities of Cancer

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    שעה
    14:00 - 15:00
    מרצה
    Prof. Eyal Gottlieb
    Ruth and Bruce Rappaport Faculty of Medicine, Technion – Israel Institute of Technology
    מארגן
    המכון לחקר הטיפול בסרטן עש דואק
    Cancer Research Club
    צרו קשר
    פרטים נוספיםShow full text description of https://weizmann.zoom.us/j/5065402023?pwd=a3Z6KzRCU0xJaUFoM2...»
    https://weizmann.zoom.us/j/5065402023?pwd=a3Z6KzRCU0xJaUFoM2Y5emZwZm1oZz09
    הרצאה
  • Date:25ראשוןאפריל 2021

    Seminar for Thesis defense of Gat Krieger

    More information
    שעה
    13:30 - 14:30
    כותרת
    Evolution of gene regulation in yeast through changes in transcription factor binding and gene expression
    מיקום
    https://weizmann.zoom.us/j/93751101380?pwd=QWJRQzVSZXVOWitiRWdJU1ZMSlFSQT09
    מרצה
    Gat Krieger
    מארגן
    המחלקה לגנטיקה מולקולרית
    צרו קשר
    הרצאה
  • Date:26שניאפריל 2021

    Physics-guided machine-learning parameterizations of subgrid processes for climate modeling

    More information
    שעה
    14:00
    מיקום
    https://weizmann.zoom.us/j/7621438333?pwd=c0lpdlQzYSthellXWG9rZnM0ZDRFZz09
    מרצה
    Janni Yuval
    Earth, Atmospheric and Planetary Sciences MIT school of Science
    מארגן
    המחלקה למדעי כדור הארץ וכוכבי הלכת
    צרו קשר
    תקצירShow full text abstract about Global climate models represent small-scale processes, such ...»
    Global climate models represent small-scale processes, such as clouds and convection, using subgrid models known as parameterizations. Traditional parameterizations are usually based on simplified physical models, and inaccuracies in these parameterizations are a main cause for the large uncertainty in climate projections. One alternative to traditional parameterizations is to use machine learning to learn new parameterizations which are data driven. However, machine-learning parameterizations might violate physical principles and often lead to instabilities when coupled to an atmospheric model. I will show how machine learning algorithms, such as neural networks and random forests, can be used to learn new parameterizations from the output of a three-dimensional high-resolution atmospheric model, while obeying physical constraints such as energy conservation. Implementing these parameterizations in the atmospheric model at coarse resolution leads to stable simulations that replicate the climate of the high-resolution simulation, and capture important statistics such as precipitation extremes. I will also discuss how machine-learning parameterizations can give further insights into the parameterization problem. Specifically, I will show that failures of machine-learning parameterizations can be used to better understand the relationship between large-scale fields and subgrid processes.
    הרצאה
  • Date:27שלישיאפריל 2021

    To be announced

    More information
    שעה
    10:00 - 11:00
    מיקום
    בניין לביוכימיה על שם נלה וליאון בנוזיו
    Cafeteria
    מרצה
    Oshrat Galibov Levi
    Dept. of Biomolecular Sciences-WIS
    מארגן
    המחלקה למדעים ביומולקולריים
    צרו קשר
    תקצירShow full text abstract about Zoom LInk: https://weizmann.zoom.us/j/95881429481?pwd=Vkxw...»
    Zoom LInk:
    https://weizmann.zoom.us/j/95881429481?pwd=VkxwUmg1Z2ErZmhpZDJqMTZwellGZz09
    הרצאה
  • Date:27שלישיאפריל 2021

    Deposition of Gypsum Deltas at the Holocene Dead Sea by outsalting and paleoclimatic insights

    More information
    שעה
    10:00 - 11:00
    מיקום
    https://weizmann.zoom.us/j/7621438333?pwd=c0lpdlQzYSthellXWG9rZnM0ZDRFZz09
    מרצה
    Nurit Weber
    Department of Earth and Planetary Sciences Weizmann Institute of Sciences
    מארגן
    המחלקה למדעי כדור הארץ וכוכבי הלכת
    צרו קשר
    תקצירShow full text abstract about The rapid retreat of the Dead Sea during the past decades le...»
    The rapid retreat of the Dead Sea during the past decades led the exposure of unique structures of massive gypsum and aragonite crusts: large capes pointing towards the open lake (termed here “gypsum deltas”) and numerous small gypsum mounds scattered on the lake’s exposed shores. Geological field relations, 14C and 34S measurements and thermodynamic calculations provide evidence that the gypsum deltas and the mounds were formed during time-intervals of low lake stands (~420±10 m below mean sea level), when sulfate-rich Ca-chloride brines discharged from the coastal aquifer via saline springs, mixed with the Dead Sea brine and precipitated the gypsum. This mixing process describes a mechanism of “gypsum outsalting”, which is completely different from the conventional view of gypsum as a product of evaporative deposition.
    Condition for enhanced saline springs discharge and “gypsum outsalting” occurred in the mid to late Holocene period (~ 6.6 to 0.6 ka), and were mainly intensive at the latest stages of regional aridity cycles when lake level was still low and the Dead Sea salinity was at its highest. The ages of formation of the gypsum structures coincide with times of North Atlantic cooling events and grand solar minima suggesting a direct impact of the latter on the Dead Sea hydrology and high sensitivity of the regional hydrology (controlling lake level) to global solar-related events. The frequency of appearance of the gypsum structures seems to follow the Hallstat Cycle that approached minimum at ~3000 2000 years ago.
    הרצאה
  • Date:27שלישיאפריל 2021

    Neural correlates of future weight loss reveal a possible role for brain-gastric interactions

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    שעה
    12:30 - 13:30
    מרצה
    Prof. Galia Avidan
    Dept of Psychology Ben Gurion University of the Negev
    מארגן
    המחלקה לנוירוביולוגיה
    צרו קשר
    פרטים נוספיםShow full text description of Zoom link to join: https://weizmann.zoom.us/j/96608033618?p...»
    Zoom link to join:
    https://weizmann.zoom.us/j/96608033618?pwd=SEdJUkR2ZzRBZ3laUUdGbWR1VFJTdz09

    Meeting ID: 966 0803 3618
    Password: 564068

    Host: Dr. Rita Schmidt rita.schmidt@weizmann.ac.il tel: 9070

    תקצירShow full text abstract about Lifestyle dietary interventions are an essential practice in...»
    Lifestyle dietary interventions are an essential practice in treating obesity, hence neural factors that may assist in predicting individual treatment success are of great significance. Here, in a prospective, open-label, three arms study, we examined the correlation between brain resting-state functional connectivity measured at baseline and weight loss following 6 months of lifestyle intervention in 92 overweight participants. We report a robust subnetwork composed mainly of sensory and motor cortical regions, whose edges correlated with future weight loss. This effect was found regardless of intervention group. Importantly, this main finding was further corroborated using a stringent connectivity-based prediction model assessed with cross-validation thus attesting to its robustness. The engagement of senso-motor regions in this subnetwork is consistent with the over-sensitivity to food cues theory of weight regulation. Finally, we tested an additional hypothesis regarding the role of brain-gastric interaction in this subnetwork, considering recent findings of a cortical network synchronized with gastric activity. Accordingly, we found a significant spatial overlap with the subnetwork reported in the present study. Moreover, power in the gastric basal electric frequency within our reported subnetwork negatively correlated with future weight loss. This finding was specific to the weight loss related subnetwork and to the gastric basal frequency. These findings should be further corroborated by combining direct recordings of gastric activity in future studies. Taken together, these intriguing results may have important implications for our understanding of the etiology of obesity and the mechanism of response to dietary intervention as well as to interoceptive perception.
    Zoom link to join:
    https://weizmann.zoom.us/j/96608033618?pwd=SEdJUkR2ZzRBZ3laUUdGbWR1VFJTdz09

    Meeting ID: 966 0803 3618
    Password: 564068

    Host: Dr. Rita Schmidt rita.schmidt@weizmann.ac.il tel: 9070
    הרצאה
  • Date:28רביעיאפריל 2021

    Spotlight on Science Lecture - Travelling The SILC Road: The Non-Coding Path to Nerve Regeneration

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    שעה
    11:00 - 12:00
    כותרת
    https://weizmann.zoom.us/j/99718325744?pwd=QWJVNGw5cTA5SU1Ed1VVZnViZ0lUQT09 Password: 193088
    מיקום
    https://weizmann.zoom.us/j/99718325744?pwd=QWJVNGw5cTA5SU1Ed1VVZnViZ0lUQT09
    מרצה
    Dr. Rotem Ben-Tov-Perry
    Department of Biological Regulation
    מארגן
    המחלקה לתשתיות מחקר מדעי החיים
    צרו קשר
    פרטים נוספיםShow full text description of ZOOM https://weizmann.zoom.us/j/99718325744?pwd=QWJVNGw5c...»
    ZOOM

    https://weizmann.zoom.us/j/99718325744?pwd=QWJVNGw5cTA5SU1Ed1VVZnViZ0lUQT09

    Password: 193088
    תקצירShow full text abstract about Travelling The SILC Road: The Non-Coding Path to Nerve Rege...»
    Travelling The SILC Road:
    The Non-Coding Path to Nerve Regeneration
    הרצאה
  • Date:02ראשוןMay 202103שניMay 2021

    Executive Board and committees meetings 2021

    More information
    שעה
    כל היום
    מיקום
    פלטפורמה דיגיטלית
    צרו קשר
    מועצת המנהלים הבינלאומית
  • Date:03שניMay 2021

    Magnetic control over chemical bonds in atomic-wires and molecular junctions

    More information
    שעה
    11:00 - 12:00
    מיקום
    https://weizmann.zoom.us/j/98063488104?pwd=N3VqTC9sU1A4RHVDZ1dhOGVxbU1iUT09
    מרצה
    Prof. Oren Tal
    Department of Chemical & Biological Physics, WIS
    מארגן
    הפקולטה לכימיה
    צרו קשר
    תקצירShow full text abstract about Controlling the properties of chemical bonds by an external ...»
    Controlling the properties of chemical bonds by an external stimulus is a central goal in chemistry. At the level of individual bonds, such control was achieved using light, current, electrochemical potential and electric field. In my talk, I will show that the size and direction of applied magnetic fields can affect bond stability, interatomic distance, and bond-formation probability. This behavior is demonstrated in a variety of atomic wires and single-molecule junctions. The revealed magneto-structural phenomena show that the influence of magnetic interactions on chemical bonds can be dramatic in nanoscale systems.
    סימפוזיונים
  • Date:03שניMay 2021

    Cooperative Carbon Capture in Metal–Organic Frameworks

    More information
    שעה
    18:00 - 19:00
    כותרת
    SAERI - Sustainability and Energy Research Initiative seminar series
    מיקום
    via zoom
    מרצה
    Prof. Jeffrey R. Long
    Departments of Chemistry and Chemical & Biomolecular Engineering,University of California, Berkeley, USA
    מארגן
    מדרשת פיינברג
    Alternative Sustainable Energy Research Initiative (AERI)
    צרו קשר
    פרטים נוספיםShow full text description of Host: Prof. Ron Milo zoom link: https://weizmann.zoom.us...»

    Host: Prof. Ron Milo
    zoom link: https://weizmann.zoom.us/j/98545366579?pwd=dXNocENmcFF6TDhld1JqS0RMcHRvQT09
    Meeting ID: 985 4536 6579
    Password: 12345
    הרצאה
  • Date:04שלישיMay 202106חמישיMay 2021

    new approaches in virology research

    More information
    שעה
    08:00 - 08:00
    מיקום
    מרכז כנסים על-שם דויד לופאטי
    Kimmel Auditorium
    יושב ראש
    Noam Stern-Ginossar
    צרו קשר
    כנסים
  • Date:04שלישיMay 2021

    To be announced

    More information
    שעה
    12:30
    מרצה
    Ivan E de Araujo
    Mt. Sinai Hospital
    מארגן
    המחלקה לנוירוביולוגיה
    צרו קשר
    פרטים נוספיםShow full text description of Zoom link to join- https://weizmann.zoom.us/j/96608033618?p...»
    Zoom link to join-
    https://weizmann.zoom.us/j/96608033618?pwd=SEdJUkR2ZzRBZ3laUUdGbWR1VFJTdz09

    Meeting ID: 966 0803 3618
    Password: 564068

    Host: Dr. Rita Schmidt rita.schmidt@weizmann.ac.il tel: 9070
    תקצירShow full text abstract about Zoom link to join- https://weizmann.zoom.us/j/96608033618?p...»
    Zoom link to join-
    https://weizmann.zoom.us/j/96608033618?pwd=SEdJUkR2ZzRBZ3laUUdGbWR1VFJTdz09

    Meeting ID: 966 0803 3618
    Password: 564068

    Host: Dr. Rita Schmidt rita.schmidt@weizmann.ac.il tel: 9070

    הרצאה
  • Date:06חמישיMay 2021

    Postdocs' colloquium

    More information
    שעה
    11:15 - 12:30
    מיקום
    https://weizmann.zoom.us/j/94477142638?pwd=aWNlZGVzNmdJdnJVZVNZUi9sZ0VBZz09
    מרצה
    Physics postdoctoral fellows
    מארגן
    הפקולטה לפיסיקה
    צרו קשר
    תקצירShow full text abstract about TBA ...»
    TBA
    סימפוזיונים

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