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Shneior Lifson
Shneior Lifson ( he, שניאור ליפסון; 18 March 1914, in Tel Aviv – 22 January 2001, in Rehovot), was an Israeli chemical physicist, scientific director of the Weizmann Institute of Science, a founder of the Open University of Israel, and laureate of the 1969 Israel Prize in the life sciences. Lifson is best known for his consistent force field method, one of the major theories behind 3-D computer modeling of large molecules. In 2013, two scientists who early in their career had worked under his guidance at the Weizmann Institute – Arieh Warshel, who was his Ph.D. student, and Michael Levitt – won the Nobel Prize in Chemistry. That research focused on the development and applications of the consistent force field method to molecular dynamics of proteins. Early years Lifson was born in Tel Aviv in 1914, into a family of Russian immigrants. While studying at the Herzliya Hebrew High School, he became active in the Hashomer Hatzair youth movement. In 1932, afte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Israel
Israel (; he, יִשְׂרָאֵל, ; ar, إِسْرَائِيل, ), officially the State of Israel ( he, מְדִינַת יִשְׂרָאֵל, label=none, translit=Medīnat Yīsrāʾēl; ), is a country in Western Asia. It is situated on the southeastern shore of the Mediterranean Sea and the northern shore of the Red Sea, and shares borders with Lebanon to the north, Syria to the northeast, Jordan to the east, and Egypt to the southwest. Israel also is bordered by the Palestinian territories of the West Bank and the Gaza Strip to the east and west, respectively. Tel Aviv is the economic and technological center of the country, while its seat of government is in its proclaimed capital of Jerusalem, although Israeli sovereignty over East Jerusalem is unrecognized internationally. The land held by present-day Israel witnessed some of the earliest human occupations outside Africa and was among the earliest known sites of agriculture. It was inhabited by the Canaanites ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kibbutz
A kibbutz ( he, קִבּוּץ / , lit. "gathering, clustering"; plural: kibbutzim / ) is an intentional community in Israel that was traditionally based on agriculture. The first kibbutz, established in 1909, was Degania. Today, farming has been partly supplanted by other economic branches, including industrial plants and high-tech enterprises. Kibbutzim began as utopian communities, a combination of socialism and Zionism. In recent decades, some kibbutzim have been privatized and changes have been made in the communal lifestyle. A member of a kibbutz is called a ''kibbutznik'' ( he, קִבּוּצְנִיק / ; plural ''kibbutznikim'' or ''kibbutzniks''). In 2010, there were 270 kibbutzim in Israel with population of 126,000. Their factories and farms account for 9% of Israel's industrial output, worth US$8 billion, and 40% of its agricultural output, worth over US$1.7 billion. Some kibbutzim had also developed substantial high-tech and military industries. For example ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Macromolecules
A macromolecule is a very large molecule important to biophysical processes, such as a protein or nucleic acid. It is composed of thousands of covalently bonded atoms. Many macromolecules are polymers of smaller molecules called monomers. The most common macromolecules in biochemistry are biopolymers (nucleic acids, proteins, and carbohydrates) and large non-polymeric molecules such as lipids, nanogels and macrocycles. Synthetic fibers and experimental materials such as carbon nanotubes are also examples of macromolecules. Definition The term ''macromolecule'' (''macro-'' + ''molecule'') was coined by Nobel laureate Hermann Staudinger in the 1920s, although his first relevant publication on this field only mentions ''high molecular compounds'' (in excess of 1,000 atoms). At that time the term ''polymer'', as introduced by Berzelius in 1832, had a different meaning from that of today: it simply was another form of isomerism for example with benzene and acetylene and had little ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polyelectrolyte
Polyelectrolytes are polymers whose repeating units bear an electrolyte group. Ion#Anions and cations, Polycations and polyanions are polyelectrolytes. These groups dissociation (chemistry), dissociate in aqueous solutions (water), making the polymers charge (physics), charged. Polyelectrolyte properties are thus similar to both electrolytes (salts) and polymers (high molecular weight compounds) and are sometimes called polysalts. Like salts, their solutions are electrically conductive. Like polymers, their solutions are often viscosity, viscous. Charged molecular chains, commonly present in soft matter systems, play a fundamental role in determining structure, stability and the interactions of various molecular assemblies. Theoretical approaches to describing their statistical properties differ profoundly from those of their electrically neutral counterparts, while technological and industrial fields exploit their unique properties. Many biological molecules are polyelectrolytes. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polymers
A polymer (; Greek '' poly-'', "many" + ''-mer'', "part") is a substance or material consisting of very large molecules called macromolecules, composed of many repeating subunits. Due to their broad spectrum of properties, both synthetic and natural polymers play essential and ubiquitous roles in everyday life. Polymers range from familiar synthetic plastics such as polystyrene to natural biopolymers such as DNA and proteins that are fundamental to biological structure and function. Polymers, both natural and synthetic, are created via polymerization of many small molecules, known as monomers. Their consequently large molecular mass, relative to small molecule compounds, produces unique physical properties including toughness, high elasticity, viscoelasticity, and a tendency to form amorphous and semicrystalline structures rather than crystals. The term "polymer" derives from the Greek word πολύς (''polus'', meaning "many, much") and μέρος (''meros'', meani ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aharon Katzir
Aharon Katzir (Aharon Katzir-Katchalsky) (September 15, 1914 – May 30, 1972) was an Israeli pioneer in the study of the electrochemistry of biopolymers. Biography Born 1914 in Łódź, Poland, he moved to Mandatory Palestine in 1925, where he taught at the Hebrew University in Jerusalem. There, he adopted his Hebrew surname ''Katzir''. He was a faculty member at the Weizmann Institute of Sciences, Rehovot, Israel as well as at the department of medical physics and biophysics at UC Berkeley, California. He was murdered in a terrorist attack at Ben Gurion International Airport in 1972 in which 26 people were killed and 80 injured. His younger brother, Ephraim Katzir, became the President of Israel in 1973. Awards and commemoration * In 1961, Katzir was awarded the Israel Prize, in life sciences, together with his pupil, Ora Kedem. * The State of Israel issued a postage stamp in memory of Katzir. * The Katchalsky crater on the Moon is named after him. * A series of Hebrew lectur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Israel Defense Forces
The Israel Defense Forces (IDF; he, צְבָא הַהֲגָנָה לְיִשְׂרָאֵל , ), alternatively referred to by the Hebrew-language acronym (), is the national military of the Israel, State of Israel. It consists of three service branches: the Israeli Ground Forces, the Israeli Air Force, and the Israeli Navy. It is the sole military wing of the Israeli security forces, Israeli security apparatus, and has no civilian jurisdiction within Israel. The IDF is headed by the Chief of the General Staff (Israel), Chief of the General Staff, who is subordinate to the Ministry of Defense (Israel), Israeli Defense Minister. On the orders of David Ben-Gurion, the IDF was formed on 26 May 1948 and began to operate as a Conscription in Israel, conscript military, drawing its initial recruits from the already-existing paramilitaries of the Yishuv—namely Haganah, the Irgun, and Lehi (militant group), Lehi. Since its formation shortly after the Israeli Declaration of Independen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1948 Arab–Israeli War
The 1948 (or First) Arab–Israeli War was the second and final stage of the 1948 Palestine war. It formally began following the end of the British Mandate for Palestine at midnight on 14 May 1948; the Israeli Declaration of Independence had been issued earlier that day, and a military coalition of Arab states entered the territory of British Palestine in the morning of 15 May. The day after the 29 November 1947 adoption of the United Nations Partition Plan for Palestine – which planned to divide Palestine into an Arab state, a Jewish state, and the Special International Regime encompassing the cities of Jerusalem and Bethlehem – an ambush of two buses carrying Jews took place in an incident regarded as the first in the civil war which broke out after the UN decision. The violence had certain continuities with the past, the Fajja bus attack being a direct response to a Lehi massacre on 19 November of five members of an Arab family, suspected of being British informan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mishmar HaEmek
Mishmar HaEmek ( he, מִשְׁמַר הָעֵמֶק, . "Guard of the Valley") is a kibbutz in northern Israel. Located in the western Jezreel Valley, it falls under the jurisdiction of the Megiddo Regional Council. Mishmar HaEmek is one of the few kibbutzim that have not undergone privatization and still follow the traditional collectivist and socialist kibbutz model. In , it had a population of . At least six former members of the Knesset hail from Mishmar HaEmek. The area was acquired by the Jewish community as part of the Sursock Purchase. The kibbutz was established in 1926 by members of the HaShomer HaTzair ("The Young Guard") movement, who mostly came from Europe to Mandatory Palestine during the Third Aliyah. It was the first Jewish settlement in the southern part of the Jezreel Valley, built as part of Jewish National Fund efforts to settle the valley. It quickly became a center of HaShomer HaTzair, especially after the Kibbutz Arzi chose to build their first region ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mathematics
Mathematics is an area of knowledge that includes the topics of numbers, formulas and related structures, shapes and the spaces in which they are contained, and quantities and their changes. These topics are represented in modern mathematics with the major subdisciplines of number theory, algebra, geometry, and analysis, respectively. There is no general consensus among mathematicians about a common definition for their academic discipline. Most mathematical activity involves the discovery of properties of abstract objects and the use of pure reason to prove them. These objects consist of either abstractions from nature orin modern mathematicsentities that are stipulated to have certain properties, called axioms. A ''proof'' consists of a succession of applications of deductive rules to already established results. These results include previously proved theorems, axioms, andin case of abstraction from naturesome basic properties that are considered true starting points of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Physics
Physics is the natural science that studies matter, its fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force. "Physical science is that department of knowledge which relates to the order of nature, or, in other words, to the regular succession of events." Physics is one of the most fundamental scientific disciplines, with its main goal being to understand how the universe behaves. "Physics is one of the most fundamental of the sciences. Scientists of all disciplines use the ideas of physics, including chemists who study the structure of molecules, paleontologists who try to reconstruct how dinosaurs walked, and climatologists who study how human activities affect the atmosphere and oceans. Physics is also the foundation of all engineering and technology. No engineer could design a flat-screen TV, an interplanetary spacecraft, or even a better mousetrap without first understanding the basic laws of physic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
