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ינואר 01, 2016
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Date:13חמישיפברואר 2020הרצאה
Interrelations between plant root exudation, tolerance to stresses and response to rhizobacteria
More information שעה 09:45 - 09:45מיקום בניין לביוכימיה על שם נלה וליאון בנוזיומרצה Prof. Andrey A. Belimov
Doctor of Biological Sciences, Head of the Laboratory of Rhizospheric Microflora. All-Russia Research Institute for Agricultural Microbiology, Saint-Petersburg, Russiaמארגן המחלקה למדעי הצמח והסביבהצרו קשר -
Date:13חמישיפברואר 2020הרצאה
Seminar for thesis defense - Karen Fridman Talmon
More information שעה 10:00 - 11:00כותרת “Functional analysis of RPTPs Lar and PTP69D and their contribution for the formation of postsynaptic sites at the neuromuscular junction”מיקום בניין ארתור ורושל בלפר למחקר ביורפואימרצה Karen Fridman Talmon מארגן המחלקה לגנטיקה מולקולריתצרו קשר -
Date:13חמישיפברואר 2020הרצאה
M.Sc thesis defense: "The origin of anharmonic atomic motion in halide perovskite crystals"
More information שעה 10:00 - 11:00מיקום בניין פרלמן למדעי הכימיהמארגן המחלקה לכימיה מולקולרית ולמדע חומריםצרו קשר תקציר 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:13חמישיפברואר 2020סימפוזיונים
Highly magnified gravitationally lensed stars as a probe to the nature of dark matter
More information שעה 11:15 - 12:30מיקום בניין הפיזיקה ע"ש עדנה וק.ב. וייסמןמרצה Jordi Miralda-Escude
Universitat de Barcelonaמארגן הפקולטה לפיזיקהצרו קשר תקציר 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:13חמישיפברואר 2020הרצאה
What can the femur tell us about human behavior and health?
More information שעה 11:30 - 12:30מיקום בניין לביוכימיה על שם נלה וליאון בנוזיומרצה Samuel Francis
Department of Anatomy and Anthropology, Sackler Faculty of Medicine, Tel Aviv Universityמארגן Academic Educational Researchצרו קשר תקציר 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:13חמישיפברואר 2020הרצאה
פרופ' אהוד אחישר - מה זה, בעצם, מדע?
More information שעה 12:00 - 12:00כותרת מה זה, בעצם, מדע?מיקום אולם ע"ש דולפי ולולה אבנרמרצה Prof. Ehud Ahissar מארגן המחלקה לתקשורת ודוברותדף בית צרו קשר -
Date:13חמישיפברואר 2020הרצאה
“What can covalent inhibitors do for YOU?"
More information שעה 14:00 - 15:00מיקום בניין ע"ש מקס ולילאן קנדיוטימרצה Prof. Nir London מארגן המחלקה לאימונולוגיה ורגנרציה ביולוגיתצרו קשר -
Date:13חמישיפברואר 2020הרצאה
Pelletron meeting - by invitation only
More information שעה 16:00 - 17:30צרו קשר -
Date:16ראשוןפברואר 2020הרצאה
Departmental Seminar by Sagie Brodsky & Noa Novershtern
More information שעה 13:00 - 13:00מיקום בניין ארתור ורושל בלפר למחקר ביורפואימארגן המחלקה לגנטיקה מולקולריתצרו קשר -
Date:16ראשוןפברואר 2020הרצאה
Shaping liquid droplets and elastic membranes
More information שעה 13:15 - 13:15מיקום בניין הפיזיקה ע"ש עדנה וק.ב. וייסמןמרצה Zvonimir Dogic
UCSBמארגן מרכז לפיזיקה ביולוגית עש קלורצרו קשר תקציר 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:17שניפברואר 2020כנסים
IPS20
More information שעה 08:00 - 08:00מיקום אודיטוריום מיכאל סלעיושב ראש Gilad Perezמארגן הפקולטה לפיזיקה -
Date:17שניפברואר 2020סימפוזיונים
2D Polymers: Synthesis in Single Crystals and on Water
More information שעה 11:00 - 12:15מיקום אולם הרצאות ע"ש גרהרד שמידטמארגן הפקולטה לכימיהצרו קשר -
Date:18שלישיפברואר 2020הרצאה
To be announced-Reserved
More information שעה 10:00 - 10:30מיקום בניין לביוכימיה על שם נלה וליאון בנוזיומארגן המחלקה למדעים ביומולקולרייםצרו קשר -
Date:20חמישיפברואר 2020כנסים
Israel Algorithmic Game Theory Day
More information שעה 08:00 - 08:00מיקום מרכז כנסים על-שם דויד לופאטייושב ראש Shahar Dobzinski -
Date:20חמישיפברואר 2020סימפוזיונים
Designing the optimal wave
More information שעה 11:15 - 12:30מיקום בניין הפיזיקה ע"ש עדנה וק.ב. וייסמןמרצה Stefan Rotter מארגן הפקולטה לפיזיקהצרו קשר תקציר Show full text abstract about I will speak about newly emerging approaches for designing w...» I will speak about newly emerging approaches for designing wave fronts that are optimal for various purposes such as for focusing waves on a target, for manipulating small particles with light, or for precision measurements in general. The theoretical concept enabling the optimal solutions for all of these diverse applications turns out to be an operator introduced by Wigner and Smith based on a system’s scattering matrix. I will provide a review of this concept and shall illustrate how experimental access to the Wigner-Smith operator enables wave-front shaping protocols at the optimal level of efficiency.
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Date:20חמישיפברואר 2020הרצאה
Looking into the rocks of Acheulo-Yabrudian Qesem Cave (Israel, 420-200 kya)
More information שעה 11:30 - 12:30מיקום בניין לביוכימיה על שם נלה וליאון בנוזיומרצה Aviad Agam
Scientific Archaeology unit, Weizmann Institute of Scienceמארגן Academic Educational Researchצרו קשר תקציר Show full text abstract about The Acheulo-Yabrudian Cultural Complex (AYCC, ~420,000-200,0...» The Acheulo-Yabrudian Cultural Complex (AYCC, ~420,000-200,000 years ago) is a local Levantine entity, characterized by a set of innovative human cultural and biological adaptations, including the habitual use of fire, technological innovations such as blade and Quina scraper production, and more. Qesem Cave (QC, central Israel) is one of the key sites of the AYCC. I will present the results of two recent studies, exploring the rich lithic assemblages yielded from this important site.
The first combines macroscopic classification of flint artefacts with a geological survey and petrographic and geochemical analyses, aimed at identifying patterns of flint acquisition and use. The results show that local Turonian flint was often brought and used at the cave, while flint from other, non-Turonian origins, was also used in noteworthy proportions, in specific categories, implying selectivity in flint procurement and exploitation through time.
The second study combines Raman spectroscopy and artificial intelligence (AI) to build temperature predictive models, aimed at identifying the temperatures to which flint artefacts were exposed. The results show that blades were heated at lower median temperatures (259℃) compared to flakes (413℃), suggesting the intentional and controlled heat treatment of flint specifically for blade production, more than 300,000 years ago.
Both datasets and their implications will be discussed in a broader perspective. -
Date:23ראשוןפברואר 202024שניפברואר 2020כנסים
Language of Evolution and Evolution of Language
More information שעה 08:00 - 08:00מיקום מרכז כנסים על-שם דויד לופאטייושב ראש Yitzhak Pilpelדף בית -
Date:23ראשוןפברואר 2020הרצאה
Exploring the limits of Earth’s habitability by scientific ocean drilling: The impact of temperature on microbial life and carbon flow in deep sub-seafloor sediments
More information שעה 11:00 - 11:00מיקום בניין משפחת זוסמןמרצה Verena Heuer
National Academy of Science University of Bremenמארגן המחלקה למדעי כדור הארץ וכוכבי הלכתצרו קשר -
Date:23ראשוןפברואר 2020הרצאה
Laser-induced graphene polymer composite membranes as electrically active filters for contaminant removal
More information שעה 11:00 - 12:00מיקום בניין פרלמן למדעי הכימיהמרצה Dr. Christopher J. Arnusch
Department of Desalination and Water Treatment, Zuckerberg Institute for Water Researchמארגן המחלקה לכימיה מולקולרית ולמדע חומריםצרו קשר תקציר Show full text abstract about The control/elimination of microorganisms, viruses and micro...» The control/elimination of microorganisms, viruses and micropollutants is relevant in many water treatment systems. We developed Laser-induced graphene (LIG), a three-dimensional, porous, electrically conductive graphene material generated by irradiation of polymer substrates composites, which have strong antifouling and antimicrobial properties. This method to “laser-print” electrically conductive antifouling graphene coatings on membranes holds promise for advanced water treatment and purification -
Date:23ראשוןפברואר 2020הרצאה
Buckyball Maracas: Fullerene Nanocontainers that Stabilize Unusual Atoms and Clusters Inside
More information שעה 14:00 - 15:00מיקום בניין הלן ומילטון קימלמןמרצה Prof. Luis Echegoyen
President of the American Chemical Society. University of El Paso, TXמארגן המחלקה לכימיה מולקולרית ולמדע חומריםצרו קשר תקציר Show full text abstract about For the past two years we have been involved in the synthesi...» For the past two years we have been involved in the synthesis and characterization of new Uranium-based endohedral fullerenes and have obtained X-Ray crystal structures for several of these compounds. Some are mono-uranium species, U@C2n, while some are di-uranium compounds (see structure at the left), U2@C2n.1 Very recently we isolated two new mono-uranium compounds that violate the Isolated Pentagon Rule (IPR) with a C76 and a C80 cage possessing fused five-membered rings (pentalenes) on their surfaces.2 Still other endohedral structures are much more interesting and totally unanticipated, with formula U2X@C2n, where X= C, O, S or N and 2n= 72, 78 or 80, which reveal interesting metal-cage interactions and totally unprecedented clusters trapped inside. Some of the carbide compounds have been crystallized and the encapsulated U2C cluster (in U=C=U@C80) exhibits unprecedented bonding with totally unanticipated properties (see structure to the right).3
Finally, we have found that bis-porphyrin capsules exhibit exquisitely selective supramolecular binding for several of these uranium-based endohedral fullerene compounds.4
The synthesis, purification and characterization of these interesting endohedral fullerenes will be presented and discussed, along with very recent results about uranium-based endohedrals.
References
1. Zhang, X.; Wang, Y.; Morales-Martínez, R.; Zhong, J.; de Graaf, C.; Rodríguez-Fortea, A.; Poblet, J. M.; Echegoyen, L.; Feng, L.; Chen, N., J. Am. Chem. Soc. 2018, 140 (11), 3907-3915.
2. Cai, W.; Abella, L.; Zhuang, J.; Zhang, X.; Feng, L.; Wang, Y.; Morales-Martínez, R.; Esper, R.; Boero, M.; Metta-Magaña, A.; Rodríguez-Fortea, A.; Poblet, J. M.; Echegoyen, L.; Chen, N., J. Am. Chem. Soc. 2018, 140 (51), 18039-18050.
3. Zhang, X.; Li, W.; Feng, L.; Chen, X.; Hansen, A.; Grimme, S.; Fortier, S.; Sergentu, D.-C.; Duignan, T. J.; Autschbach, J.; Wang, S.; Wang, Y.; Velkos, G.; Popov, A. A.; Aghdassi, N.; Duhm, S.; Li, X.; Li, J.; Echegoyen, L.; Schwarz, W. H. E.; Chen, N., Nature Comm. 2018, 9 (1), 2753.
4. Fuertes-Espinosa, C.; Gómez-Torres, A.; Morales-Martínez, R.; Rodríguez-Fortea, A.; García-Simón, C.; Gándara, F.; Imaz, I.; Juanhuix, J.; Maspoch, D.; Poblet, J. M.; Echegoyen, L.; Ribas, X., Angew. Chem. Int. Ed. 2018, 57 (35), 11294-11299.