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תוצאות חיפוש לאירועים

  • Date:26שלישיאוקטובר 2021

    Systematic analysis of contact site proteomes reveals novel players in cellular homeostasis Maya Schuldiner, Weizmann Institute of Science

    More information
    שעה
    10:00 - 11:00
    מיקום
    בניין לביוכימיה על שם נלה וליאון בנוזיו
    Auditorium
    מרצה
    Prof. Maya Schuldiner
    Dept. of Molecular Genetics-WIS
    מארגן
    המחלקה למדעים ביומולקולריים
    צרו קשר
    תקצירShow full text abstract about To communicate and work cooperatively, organelles must come ...»
    To communicate and work cooperatively, organelles must come into close proximity at membrane contact sites to transfer lipids and small metabolites. Despite our increasing understanding of membrane contact sites, many of their molecular components have yet to be identified, making it difficult to investigate their over-arching roles in cellular and organism function. To overcome this limitation, we established a systematic and high throughput microscopy approach to identify contact site resident proteins in the budding yeast Saccharomyces cerevisiae. Using this method, we have identified multiple new contact site proteins. I will share an example of how mechanistic follow-up on such new contact residents is leading to a new understanding of organelle Biology.
    הרצאה
  • Date:26שלישיאוקטובר 2021

    PhD defense seminar by Shir Nevo ( Abramson lab)

    More information
    שעה
    10:00 - 11:00
    כותרת
    Will lecture on: “Thymic tuft cells - molecular and functional characterization.”
    מארגן
    המחלקה לאימונולוגיה
    צרו קשר
    פרטים נוספיםShow full text description of The lecture will take place on Tuesday, October 26th, at 10:...»
    The lecture will take place on Tuesday, October 26th, at 10:00. You are invited to join on Zoom:
    https://weizmann.zoom.us/j/96716327391?pwd=UVFYOUNIQXdia2hSRkNpSWYyL0J1dz09

    הרצאה
  • Date:26שלישיאוקטובר 2021

    Unraveling the microscale mechanisms driving particle degradation in the ocean

    More information
    שעה
    11:30 - 12:30
    מיקום
    https://weizmann.zoom.us/j/96896290817?pwd=WmoxNzZSRFArL3VzNUY3bHRpZFZoQT09 Password: 230371
    מרצה
    Dr. Uria Alcolombri
    Prof. Roman Stocker Lab ETH Zurich
    מארגן
    המחלקה למדעי הצמח והסביבה
    צרו קשר
    פרטים נוספיםShow full text description of Host: Prof. Asaph Aharoni ...»
    Host: Prof. Asaph Aharoni
    תקצירShow full text abstract about The sinking of organic particles in the ocean and their degr...»
    The sinking of organic particles in the ocean and their degradation by marine microorganisms drive one of the most conspicuous carbon fluxes on Earth, the biological pump. Yet, the mechanisms determining the magnitude of the pump remain poorly understood, limiting our ability to predict this carbon flux in future ocean scenarios. Current ocean models assume that the biological pump is governed by the competition between sinking speed and degradation rate, with the two processes independent from one another. In this talk, I will demonstrate that contrary to this paradigm, sinking itself is a primary determinant of the rate at which bacteria enzymatically degrade particles in the ocean. By combining video microscopy and microfluidic experiments to directly observe and quantify bacterial degradation of individual organic particles in flow, I will show that even modest sinking speeds of 8 meters per day enhance degradation rates more than 10-fold. I will further discuss the molecular mechanism behind the sinking-enhanced degradation, as well as possible ways by which bacteria can slow the sinking of particles. Finally, using the results obtained from a mathematical model, I will show that the coupling of sinking and degradation may contribute to determining the magnitude of the vertical carbon flux in the ocean, and will outline major open questions in the field.
    הרצאה
  • Date:26שלישיאוקטובר 2021

    Unraveling the microscale mechanisms driving particle degradation in the ocean

    More information
    שעה
    11:30 - 12:30
    כותרת
    Guest Seminar via zoom
    מיקום
    https://weizmann.zoom.us/j/96896290817?pwd=WmoxNzZSRFArL3VzNUY3bHRpZFZoQT09 Password: 230371
    מרצה
    Dr. Uria Alcolombri
    Prof. Roman Stocker Lab ETH Zurich
    מארגן
    המחלקה למדעי הצמח והסביבה
    צרו קשר
    פרטים נוספיםShow full text description of Host: Prof. Asaph Aharoni ...»
    Host: Prof. Asaph Aharoni
    תקצירShow full text abstract about The sinking of organic particles in the ocean and their degr...»
    The sinking of organic particles in the ocean and their degradation by marine microorganisms drive one of the most conspicuous carbon fluxes on Earth, the biological pump. Yet, the mechanisms determining the magnitude of the pump remain poorly understood, limiting our ability to predict this carbon flux in future ocean scenarios. Current ocean models assume that the biological pump is governed by the competition between sinking speed and degradation rate, with the two processes independent from one another. In this talk, I will demonstrate that contrary to this paradigm, sinking itself is a primary determinant of the rate at which bacteria enzymatically degrade particles in the ocean. By combining video microscopy and microfluidic experiments to directly observe and quantify bacterial degradation of individual organic particles in flow, I will show that even modest sinking speeds of 8 meters per day enhance degradation rates more than 10-fold. I will further discuss the molecular mechanism behind the sinking-enhanced degradation, as well as possible ways by which bacteria can slow the sinking of particles. Finally, using the results obtained from a mathematical model, I will show that the coupling of sinking and degradation may contribute to determining the magnitude of the vertical carbon flux in the ocean, and will outline major open questions in the field.
    הרצאה
  • Date:26שלישיאוקטובר 2021

    Nonoscillatory coding and multiscale representation of very large environments in the bat hippocampus by Tamir Eliav and There is Chemistry in Social Chemistry by Inbal Ravreby

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    שעה
    12:30 - 13:30
    מיקום
    אולם הרצאות ע"ש גרהרד שמידט
    מרצה
    Tamir Eliav, Prof. Nachum Ulanovsky Lab and Inbal Ravreby, Prof. Noam Sobel Lab, Dept of Brain Sciences
    מארגן
    המחלקה למדעי המוח
    צרו קשר
    פרטים נוספיםShow full text description of Student Seminar-Dept of Brain Sciences...»
    Student Seminar-Dept of Brain Sciences
    תקצירShow full text abstract about Nonoscillatory coding and multiscale representation of very ...»
    Nonoscillatory coding and multiscale representation of very large environments in the bat hippocampus

    Abstract: The hippocampus plays a key role in memory and navigation, and forms a cognitive map of the world: hippocampal ‘place cells’ encode the animal’s location by activating whenever the animal passes a particular region in the environment (the neuron’s ‘place field’). Over the last 50 years of hippocampal research, almost all studies have focused on rodents as animal models, using small laboratory experimental setups. In my research, I explored hippocampal representations in a naturalistic settings, in a unique animal model – the bat. My talk will outline two main stories: (i) In rodents, hippocampal activity exhibits ‘theta oscillations’. These oscillations were proposed to support multiple functions, including memory and sequence formation. However, absence of clear theta in bats and humans has questioned these proposals. Surprisingly, we found that in bats hippocampal neurons exhibited nonoscillatory phase-coding. This highlights the importance of phase-coding, but not oscillations per se, for hippocampal function across species – including humans. (ii) Real-world navigation requires spatial representation of very large environments. To investigate this, we wirelessly recorded from hippocampal dorsal CA1 neurons of bats flying in a long tunnel (200 meters). Place cells displayed a multifield multiscale code: Individual neurons exhibited multiple place fields of diverse sizes, ranging from 0.6 to 32 meters, and the fields of the same neuron differed up to 20-fold in size. Theoretical analysis showed that the multiscale code allows representing large environments with much better accuracy than other codes. Thus, by increasing the spatial scale, we uncovered a neural code that is radically different from classical spatial codes. Together, these results highlight the power of the comparative approach, and demonstrate that studying the brain under naturalistic settings and behavior enables discovering new unknown aspects of the neural code.

    There is Chemistry in Social Chemistry
    Abstract: Non-human terrestrial mammals constantly sniff themselves and each-other, and based on this decide who is friend or foe. Humans also constantly sniff themselves and each-other, but the functional significance of this behavior is unknown. Given that humans seek friends who are similar to themselves, we hypothesized that humans may be smelling themselves and others to subconsciously estimate body-odor similarity, and that this may then promote friendship. To test this hypothesis, we recruited non-romantic same-sex friend dyads who had initially bonded instantaneously, or so called click-friends, and harvested their body-odor. In a series of experiments, we then found that objective ratings obtained with an electronic nose, and subjective ratings obtained from independent human smellers, converged to suggest that click-friends smell more similar to each other than random dyads. To then estimate whether this similarity was merely a consequence of friendship, or a driving force of friendship, we recruited complete strangers, smelled them with an electronic nose, and engaged them in non-verbal same-sex dyadic interactions. Remarkably, we observed that dyads who smelled more similar had better dyadic interactions. In other words, we could predict social bonding with an electronic nose. This result implies that body-odor similarity is a causal factor in social interaction, or in other words, there is indeed chemistry in social chemistry.

    הרצאה
  • Date:27רביעיאוקטובר 2021

    Algebraic Geometry and Representation Theory Seminar

    More information
    שעה
    15:00 - 16:00
    כותרת
    On the socles of certain parabolically induced representations of p-adic classical groups
    מיקום
    בניין יעקב זיסקינד
    Room 155
    מרצה
    Hiraku Atobe
    Hokkaido University
    מארגן
    הפקולטה למתמטיקה ומדעי המחשב
    Algebraic Geometry and Representation Theory Seminar
    צרו קשר
    פרטים נוספיםShow full text description of In this talk, we consider representations of p-adic classica...»
    In this talk, we consider representations of p-adic classical groups parabolically induced from
    the products of shifted Speh representations and unitary representations of Arthur type of good parity.
    We describe how to compute the socles (the maximal semisimple subrepresentations) of these representations algorithmically.
    As a consequence, we can determine whether these representations are reducible or not.
    In particular, our results produce many unitary representations.

    תקצירShow full text abstract about In this talk, we consider representations of p-adic classica...»
    In this talk, we consider representations of p-adic classical groups parabolically induced from
    the products of shifted Speh representations and unitary representations of Arthur type of good parity.
    We describe how to compute the socles (the maximal semisimple subrepresentations) of these representations algorithmically.
    As a consequence, we can determine whether these representations are reducible or not.
    In particular, our results produce many unitary representations.


    הרצאה
  • Date:27רביעיאוקטובר 2021

    Superalgebra Theory and Representations Seminar

    More information
    שעה
    19:15 - 20:15
    כותרת
    Minicourse on Duflo-Serganova functors
    מרצה
    Alex Sherman (BGU) and Crystal Hoyt (Bar Ilan University)
    .
    מארגן
    הפקולטה למתמטיקה ומדעי המחשב
    Faculty of Mathematical Sciences Seminar, המחלקה למדעי המחשב ומתמטיקה שימושית
    Faculty of Mathematical Sciences Seminar, המחלקה למתמטיקה
    Faculty of Mathematical Sciences Seminar
    צרו קשר
    פרטים נוספיםShow full text description of ***The mini-course will consist of 3 talks on Wednesdays...»


    ***The mini-course will consist of 3 talks on Wednesdays (Oct. 20th, Oct. 27th, Nov. 3rd), at 19:15 Israel time.
    תקצירShow full text abstract about Given an odd element x in a Lie superalgebra g satisfying [...»
    Given an odd element x in a Lie superalgebra g satisfying [x, x] = 0, we have that x^2 = 0 in the universal enveloping algebra of g, and so for every g-module M, we can define the cohomology DS_x (M) := Ker (x) / Im(x).In fact, DS(M) is a module for the Lie superalgebra g_x := DS_x (g) = Ker ad(x) / Im ad(x), which is a Lie superalgebra of smaller rank than g. For example, if g = gl(m|n) and x is a root vector, then g_x = gl(m − 1|n − 1). Duflo and Serganova defined the functor DS_x from the category of g-modules to the category of g_x-modules which is now called the Duflo–Serganova functor. This minicourse will give an overview of the theory of Duflo–Serganova functors and the recen
    הרצאה
  • Date:28חמישיאוקטובר 2021

    Zoom: “Fast, accessible hyperpolarization for MRI and liquid-state NMR”

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    שעה
    09:30 - 10:30
    מרצה
    Ilai Schwartz
    NVision Imaging Technologies, Ulm
    מארגן
    מכון קלור לדימות וספקטרוסקופיה של תהונה מגנטית בעוצמות גבוהות
    צרו קשר
    פרטים נוספיםShow full text description of . ...»
    .


    תקצירShow full text abstract about Zoom Lecture: Zoom: : https://weizmann.zoom.us/j/9236283...»
    Zoom Lecture:

    Zoom: : https://weizmann.zoom.us/j/92362836861?pwd=Q29EMVcxaXJkSE5QbWxpUEdPdGNQUT09

    Passcode: 526083


    Nuclear spin hyperpolarization provides a promising route to overcome the challenges imposed by the limited sensitivity of nuclear magnetic resonance. Significant progress in the last decades was achieved by the development of new hyperpolarization techniques (e.g. dissolution-DNP). This has resulted in the demonstration of new MRI applications utilizing hyperpolarized 13C nuclei in metabolic probes as well as promising results in hyperpolarized liquid state NMR. However, hyperpolarization for both MRI and liquid state NMR applications is still a challenging endeavor, requiring expensive hardware and imposing limitations on the experimental setup.

    In this talk I will present our latest developments for achieving fast, accessible polarization for both MRI and NMR applications utilizing a variety of polarization techniques: (1) For MRI applications we have demonstrated for the first time that using parahydrogen induced polarization (PHIP), hyperpolarized fumarate and pyruvate can be prepared at clinically relevant concentrations (> 100mM) and hyperpolarization values up to 20% at the time of injection. In a comparative study we show that PHIP based methods can compete and even surpass both polarization and concentration levels of metabolic tracers prepared by DNP but at a fraction of the cost, complexity and preparation time. (2) Leveraging optical polarization, we developed a technique for versatile liquid state NMR hyperpolarization, achieving between 200- and 1730-fold signal enhancement at 1.45T for a range of small molecules. The signal enhancement is induced by using optically polarized pentacene-doped naphthalene crystals as a source of spin polarization. We demonstrate that rapid dissolution of the highly polarized crystal enables transfer of polarization to the target molecules via intermolecular cross relaxation in the liquid state at room temperature. Due to the extremely high magnetization of the naphthalene molecules, the cross relaxation leads to a substantial polarization buildup in the target analytes. Crucially, the polarization transfer is achieved without costly instrumentation and occurs in less than a minute inside the NMR spectrometer
    הרצאה
  • Date:28חמישיאוקטובר 2021

    PhD defense seminar by Daoud Sheban ( Merbl lab and Hanna lab )

    More information
    שעה
    12:00
    כותרת
    Will lecture on: “Deciphering Mechanisms of SUMO-Dependent Chromatin Regulation in Mammalian Early Development.”
    מרצה
    Daoud Sheban
    מארגן
    המחלקה לאימונולוגיה
    צרו קשר
    פרטים נוספיםShow full text description of The lecture will take place on Thursday, October 28th, at 12...»
    The lecture will take place on Thursday, October 28th, at 12:00. You are invited to join on Zoom:
    https://weizmann.zoom.us/j/6224628543?pwd=OTNXNHhzUmxRY1hHczZoT1gyMjcrdz09
    הרצאה
  • Date:31ראשוןאוקטובר 202104חמישינובמבר 2021

    SAAC meeting 2021

    More information
    שעה
    כל היום
    צרו קשר
    מועצת המנהלים הבינלאומית
  • Date:31ראשוןאוקטובר 2021

    Promenades through Nobels' landscapes: From disorder & fluctuations to organization in Earth’s climate and other complex systems

    More information
    שעה
    11:00
    מיקום
    https://weizmann.zoom.us/j/7621438333?pwd=c0lpdlQzYSthellXWG9rZnM0ZDRFZz09
    מרצה
    Michael David Chekroun
    Department of Earth and Planetary Sciences Weizmann Institute of Science
    מארגן
    המחלקה למדעי כדור הארץ וכוכבי הלכת
    צרו קשר
    הרצאה
  • Date:01שנינובמבר 2021

    ISBMB annual meeting on Protein Engineering Design and Evolution, Commemorating the work of Professor Dan Tawfik

    More information
    שעה
    09:00 - 17:30
    מיקום
    The David Lopatie Conference Centre
    צרו קשר
    כנסים
  • Date:02שלישינובמבר 2021

    Special Guest Seminar

    More information
    שעה
    10:00 - 11:00
    כותרת
    Self-organized morphogenesis of a stem-cell derived human neural tu
    מיקום
    https://weizmann.zoom.us/j/91871920099?pwd=Qm1kZzc2emV3cGQyekthNWFCOThWdz09
    מרצה
    Dr. Eyal Karzbrun
    Self-organized morphogenesis of a stem-cell derived human neural tube
    מארגן
    המחלקה לגנטיקה מולקולרית
    צרו קשר
    הרצאה
  • Date:02שלישינובמבר 2021

    Order from Chaos: Chromosome Catastrophes Drive Cancer Evolution

    More information
    שעה
    10:00 - 11:00
    מיקום
    בניין לביוכימיה על שם נלה וליאון בנוזיו
    Auditorium
    מרצה
    Dr. Ofer Shoshani
    Dept. of Biomolecular Sciences
    מארגן
    המחלקה למדעים ביומולקולריים
    צרו קשר
    תקצירShow full text abstract about Chromosomal instability is one of the major hallmarks in can...»
    Chromosomal instability is one of the major hallmarks in cancer driving numerical and structural chromosome aberrations. Cancer cells can use the chaotic background of chromosome instability to generate ordered genomic events leading to accelerated tumor formation or drug resistance. I will show how chromothripsis, the catastrophic shattering of a chromosome and random religation of its pieces, can promote resistance to therapy. Using cancer cells and patient samples, I identified that chromothripsis drives the formation and evolution of extrachromosomal DNA (ecDNA) elements that can amplify genes conferring drug resistance. I will then discuss how transient centrosome amplification can induce a burst of chromosomal instability in vivo. This triggers the formation of random aneuploidies (changes in chromosome numbers) with cancer initiating cells carrying a specific aneuploidy signature leading to accelerated tumorigenesis. This work has uncovered aneuploidy as a direct driver of cancer and enables a better understanding of the involvement of specific aneuploidies in cancer.
    הרצאה
  • Date:02שלישינובמבר 2021

    PhD Thesis Defense seminar by Boaz Negin ( Prof. Asaph Aharoni’s Lab)

    More information
    שעה
    11:30 - 12:30
    כותרת
    PhD Thesis Defense seminar
    מיקום
    בניין לביוכימיה על שם נלה וליאון בנוזיו
    Auditorium
    מרצה
    Boaz Negin
    Prof. Asaph Aharoni’s Lab, Dept. of Plant and Environmental Sciences - WIS
    מארגן
    המחלקה למדעי הצמח והסביבה
    צרו קשר
    פרטים נוספיםShow full text description of Host: Prof. Asaph Aharoni...»
    Host: Prof. Asaph Aharoni
    תקצירShow full text abstract about The sinking of organic particles in the ocean and their degr...»
    The sinking of organic particles in the ocean and their degradation by marine microorganisms drive one of the most conspicuous carbon fluxes on Earth, the biological pump. Yet, the mechanisms determining the magnitude of the pump remain poorly understood, limiting our ability to predict this carbon flux in future ocean scenarios. Current ocean models assume that the biological pump is governed by the competition between sinking speed and degradation rate, with the two processes independent from one another. In this talk, I will demonstrate that contrary to this paradigm, sinking itself is a primary determinant of the rate at which bacteria enzymatically degrade particles in the ocean. By combining video microscopy and microfluidic experiments to directly observe and quantify bacterial degradation of individual organic particles in flow, I will show that even modest sinking speeds of 8 meters per day enhance degradation rates more than 10-fold. I will further discuss the molecular mechanism behind the sinking-enhanced degradation, as well as possible ways by which bacteria can slow the sinking of particles. Finally, using the results obtained from a mathematical model, I will show that the coupling of sinking and degradation may contribute to determining the magnitude of the vertical carbon flux in the ocean, and will outline major open questions in the field.
    הרצאה
  • Date:02שלישינובמבר 2021

    PhD Thesis Defense seminar by Boaz Negin ( Prof. Asaph Aharoni’s Lab)

    More information
    שעה
    11:30 - 12:30
    מיקום
    Benoziyo Bldg. for Biological Sciences Auditorium - Floor 1
    מרצה
    Boaz Negin
    מארגן
    המחלקה למדעי הצמח והסביבה
    צרו קשר
    תקצירShow full text abstract about The sinking of organic particles in the ocean and their degr...»
    The sinking of organic particles in the ocean and their degradation by marine microorganisms drive one of the most conspicuous carbon fluxes on Earth, the biological pump. Yet, the mechanisms determining the magnitude of the pump remain poorly understood, limiting our ability to predict this carbon flux in future ocean scenarios. Current ocean models assume that the biological pump is governed by the competition between sinking speed and degradation rate, with the two processes independent from one another. In this talk, I will demonstrate that contrary to this paradigm, sinking itself is a primary determinant of the rate at which bacteria enzymatically degrade particles in the ocean. By combining video microscopy and microfluidic experiments to directly observe and quantify bacterial degradation of individual organic particles in flow, I will show that even modest sinking speeds of 8 meters per day enhance degradation rates more than 10-fold. I will further discuss the molecular mechanism behind the sinking-enhanced degradation, as well as possible ways by which bacteria can slow the sinking of particles. Finally, using the results obtained from a mathematical model, I will show that the coupling of sinking and degradation may contribute to determining the magnitude of the vertical carbon flux in the ocean, and will outline major open questions in the field.
    הרצאה
  • Date:02שלישינובמבר 2021

    Brain-wide networks underlying behavior - Insights from functional ultrasound imaging

    More information
    שעה
    12:30 - 13:30
    מרצה
    Dr. Emilie Macé
    Max Planck Institute of Neurobiology, Martinsried, Germany
    מארגן
    המחלקה למדעי המוח
    צרו קשר
    פרטים נוספיםShow full text description of Zoom link: https://weizmann.zoom.us/j/95406893197?pwd=REt5L1...»
    Zoom link: https://weizmann.zoom.us/j/95406893197?pwd=REt5L1g3SmprMUhrK3dpUDJVeHlrZz09

    Meeting ID: 954 0689 3197
    Password: 750421

    Host: Dr. Takashi Kawashima takashi.kawashima@weizmann.ac.il tel: 2995
    תקצירShow full text abstract about Functional ultrasound imaging (fUS) is an emerging neuroimag...»
    Functional ultrasound imaging (fUS) is an emerging neuroimaging tool capable of measuring brain-wide vascular signals linked to neuronal activity with a high spatial-temporal resolution (100 µm, 10 Hz) in real-time. This technology is portable, affordable and adaptable to many species, and has already found applications in areas ranging from basic research to the clinic. Focusing on fundamental neuroscience, I will outline some of the recent technical advancements of fUS, such as the capacity to image the entire rodent brain while manipulating specific neuronal circuits with optogenetics. I will exemplify how promising this imaging technique is for shedding new light on the brain-wide circuits underlying behavior, as fUS is one of the few methods that enables imaging of activity deep in the brain of behaving mice.
    Zoom link: https://weizmann.zoom.us/j/95406893197?pwd=REt5L1g3SmprMUhrK3dpUDJVeHlrZz09
    Meeting ID: 954 0689 3197
    Password: 750421

    הרצאה
  • Date:02שלישינובמבר 2021

    Why Chirality Is Essential for Life

    More information
    שעה
    14:00 - 15:00
    מיקום
    אולם הרצאות ע"ש גרהרד שמידט
    מרצה
    Prof. Ron Naaman
    Department of Chemical and Biological Physics Weizmann Institute
    מארגן
    המחלקה לביולוגיה מבנית וכימית
    צרו קשר
    הרצאה
  • Date:03רביעינובמבר 2021

    Superalgebra Theory and Representations Seminar

    More information
    שעה
    19:15 - 20:15
    כותרת
    Minicourse on Duflo-Serganova functors
    מרצה
    Alex Sherman (BGU) and Crystal Hoyt (Bar Ilan University)
    .
    מארגן
    הפקולטה למתמטיקה ומדעי המחשב
    Faculty of Mathematical Sciences Seminar, המחלקה למדעי המחשב ומתמטיקה שימושית
    Faculty of Mathematical Sciences Seminar, המחלקה למתמטיקה
    Faculty of Mathematical Sciences Seminar
    צרו קשר
    פרטים נוספיםShow full text description of ***The mini-course will consist of 3 talks on Wednesdays (Oc...»
    ***The mini-course will consist of 3 talks on Wednesdays (Oct. 20th, Oct. 27th, Nov. 3rd), at 19:15 Israel time.
    תקצירShow full text abstract about Given an odd element x in a Lie superalgebra g satisfying [x...»
    Given an odd element x in a Lie superalgebra g satisfying [x, x] = 0, we have that x^2 = 0 in the universal enveloping algebra of g, and so for every g-module M, we can define the cohomology DS_x (M) := Ker (x) / Im(x).In fact, DS(M) is a module for the Lie superalgebra g_x := DS_x (g) = Ker ad(x) / Im ad(x), which is a Lie superalgebra of smaller rank than g. For example, if g = gl(m|n) and x is a root vector, then g_x = gl(m − 1|n − 1). Duflo and Serganova defined the functor DS_x from the category of g-modules to the category of g_x-modules which is now called the Duflo–Serganova functor. This minicourse will give an overview of the theory of Duflo–Serganova functors and the rece
    הרצאה
  • Date:04חמישינובמבר 2021

    Physics Colloquium

    More information
    שעה
    11:15 - 12:30
    כותרת
    From Quantum Mechanics to Thermodynamics and Back: On Quantum Systems, Baths and Observers
    מיקום
    בניין הפיסיקה ע"ש עדנה וק.ב. וייסמן
    Auditorium
    מרצה
    Gershon Kurizki
    Weizmann Institute of Science
    מארגן
    הפקולטה לפיסיקה
    צרו קשר
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    Thermodynamics requires a system to equilibrate with its thermal environment, alias a bath. However, our results over the years have shown that, surprisingly, nonintrusive observations of a quantum system may heat or cool it, thus preventing the equilibration [1,2]. Recently, we have shown that also the bath state, which is considered immutable in thermodynamics, is dramatically changed by a quantum probe and its observations [3]. These effects stem from the unavoidable entanglement between quantum systems and baths even when they are weakly coupled, thus undermining the tenets of thermodynamics in the quantum domain. Most remarkably, we have recently demonstrated that probe observations can render thermal bath states nearly pure [4]. The implications are far reaching, most prominently the ability to reverse the time arrow of the entire system-bath compound, by causing its quantum coherent oscillation. This raises the question: Is thermodynamics, which rests on the concept of a bath, compatible with quantum mechanics? It may appear necessary to assume that a quantum working medium in a heat machine is dissipated by a bath [5,6]. Yet, most recently, we have shown that heat machines can be perfectly coherent, non-dissipative devices realized by nonlinear interferometers fed by few thermal modes [7], so that baths are redundant. Finally, I will discuss the ability of observers to commute information to work [8] and speculate on the role of observers in physics [9].

    References to our work
    1. Nature 452, 724 (2008).
    2. PRL 105,160401 (2010).
    3. NJP 22, 083035 (2020).
    4. Arxiv 2108.09826 (2021)
    5. Nat. Commun. 9, 165 (2018).
    6. PNAS 115, 9941 (2018); PNAS 114, 12156 (2017).
    7. Arxiv2108.10157 (2021).
    8. PRL 127, 040602 (2021).
    9. G.Kurizki and G. Gordon, “The Quantum Matrix” (Oxford Univ. Press, 2020).
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