Origin of the Sinai-Negev erg, Egypt and Israel: mineralogical and geochemical evidence for the importance of the Nile and sea level history

The Sinai-Negev erg occupies an area of 13,000 km2 in the deserts of Egypt and Israel. Aeolian sand of this erg has been proposed to be derived from the Nile Delta, but empirical data supporting this view are lacking. An alternative source sediment is sand from the large Wadi El Arish drainage system in central and northern Sinai. Mineralogy of the Negev and Sinai dunes shows that they are high in quartz, with much smaller amounts of K-feldspar and plagioclase. Both Nile Delta sands and Sinai wadi sands, upstream of the dunes, also have high amounts of quartz relative to K-feldspar and plagioclase. However, Sinai wadi sands have abundant calcite, whereas Nile Delta sands have little or no calcite. Overall, the mineralogical data suggest that the dunes are derived dominantly from the Nile Delta, with Sinai wadi sands being a minor contributor. Geochemical data that proxy for both the light mineral fraction (SiO2/10-Al2O3 + Na2O + K2O-CaO) and heavy mineral fraction (Fe2O3-MgO-TiO2) also indicate a dominant Nile Delta source for the dunes. Thus, we report here the first empirical evidence that the Sinai-Negev dunes are derived dominantly from the Nile Delta. Linkage of the Sinai-Negev erg to the Nile Delta as a source is consistent with the distribution of OSL ages of Negev dunes in recent studies. Stratigraphic studies show that during the Last Glacial period, when dune incursions in the Sinai-Negev erg began, what is now the Nile Delta area was characterized by a broad, sandy, minimally vegetated plain, with seasonally dry anastomosing channels. Such conditions were ideal for providing a ready source of sand for aeolian transport under what were probably much stronger glacial-age winds. With the post-glacial rise in sea level, the Nile River began to aggrade. Post-glacial sedimentation has been dominated by fine-grained silts and clays. Thus, sea level, along with favorable climatic conditions, emerges as a major influence on the timing of dune activity in the Sinai-Negev erg, through its control on the supply of sand from the Nile Delta. The mineralogy of the Sinai-Negev dunes is also consistent with a proposed hypothesis that these sediments are an important source of loess in Israel

Orally Administrated Cinnamon Extract Reduces β-Amyloid Oligomerization and Corrects Cognitive Impairment in Alzheimer's Disease Animal Models

An increasing body of evidence indicates that accumulation of soluble oligomeric assemblies of β-amyloid polypeptide (Aβ) play a key role in Alzheimer's disease (AD) pathology. Specifically, 56 kDa oligomeric species were shown to be correlated with impaired cognitive function in AD model mice. Several reports have documented the inhibition of Aβ plaque formation by compounds from natural sources. Yet, evidence for the ability of common edible elements to modulate Aβ oligomerization remains an unmet challenge. Here we identify a natural substance, based on cinnamon extract (CEppt), which markedly inhibits the formation of toxic Aβ oligomers and prevents the toxicity of Aβ on neuronal PC12 cells. When administered to an AD fly model, CEppt rectified their reduced longevity, fully recovered their locomotion defects and totally abolished tetrameric species of Aβ in their brain. Furthermore, oral administration of CEppt to an aggressive AD transgenic mice model led to marked decrease in 56 kDa Aβ oligomers, reduction of plaques and improvement in cognitive behavior. Our results present a novel prophylactic approach for inhibition of toxic oligomeric Aβ species formation in AD through the utilization of a compound that is currently in use in human diet

[Memoirs] : [1922-1996].

The memoirs were written in 1996. Childhood recollections of growing up in Stanislawow. Early awareness of antisemitism and the constant dangers of pogroms. Antisemitism at school and numerus clausus for Jews entering universities. Dan Porat's family were rather wealthy, since his father owned a freight shipping business. His oldest sister Etka went to Vienna to study medicine. During the World recession his father lost his business. The family moved to the shtetl of Kuty due to their financial difficulties, while his father tried to establish himself anew in Vienna. Multi-lingual environment of the shtetl. Detailled acount of his Jewish education and Mishnah studies in the cheder. Difficulties in obtaining an exit visa to join their father in Vienna. Arrival in Vienna in 1934 as illeagal immigrants. Presence of antisemitism and hostility towards Eastern Jews (Ostjuden). Dan was enrolled in the Chajes Gymnasium, the first Jewish high school in Vienna. Language and cultural differences. At age 12 Dan started a part-time job as a bookkeeper to contribute to the family income. Recollections of his Bar Mitzwah celebration. Political turmoil and growing presence of the illeagal Nazi movement. Detailled account of the Anschluss in 1938 and the frequent rounding-up of Jews in the streets of Vienna. Life in National Socialist Vienna and increasing anti-Jewish regulations. Recollections of Kristallnacht. Dan's father was arrested and never heard of again. Dan was involved in the Zionist movement and prepared for his emigration to Palestine. In 1939 he managed to get his papers and left for Palestine. Life in the kibbutz. Due to his Hebrew knowledge he adapted easier to the new environment. Dan joined the Haganah movement and volunteered as an enigineer in the British army. Fights against the Germans in Africa and Italy. Traces of German atrocities.After the end of war he learned about the fate of his family, who perished in the Holocaust. Dan rejoined the Haganah after war. He got married to his wife Frieda in 1946. Continuation of his studies. Birth of his son Uri. Declaration of the State of Israel in 1948. Volunteering in the War of Independence. Scholarship to study physics at Manchester University in England. Birth of his daughters Ruthi and Naomi in England. Move to USA to work as nuclear physicist at Harvard and MIT. Position as physicist at Stanford for 26 years.The physicist Dan Porat was born as the youngest child of three in Stanislawow, Poland in 1922. His family moved to Vienna in 1934. Dan emigrated to Palestine in 1939 and volunteered in the British army during World War II. After the war he received a scholarship to study physics in England. Dan Porat was offered a position at Harvard University and moved to the United States. He obtained a position at Stanford University and lives with his family in California.Synopsis in fileAustrian Heritage CollectionSee also Dan Porat Collection (AR 11532)Trumpeldor, YossefStanislawow (Stanislau)HarvardKutyManchesterRomeStanfordTarnow (ghetto)Tel AvivItalyUnited StatesChajes GymnasiumChassidismChildhoodDepressionEast European JewryEducation, Jewish, 1918-1933Education, primary and secondary, 1918-1933Education, higher, after 1945Emigration and immigration, after 1945, Great BritainEmigration and immigration, after 1945, USAGhettosGreat Britain, history, 1945-Harvard UniversityHolidays, JewishJews, liturgy and ritualCollective settlements--IsraelMilitary service, World War IIPalestine, history, 1933-1945Poland, history, 1918-1939Stanford UniversityTerroris

Introduction to microcomputers and microprocessors

Index Bibliografi hlm. 98xi, 108 hlm. :il. ;23 cm