نتایج جستجو برای: since the 1940s
تعداد نتایج: 16055747 فیلتر نتایج به سال:
abstract venlafaxine, 1–[2–(dimethylamino)–1–(4–methoxyphenyl) ethyl]cyclohexanol hydrochloride is a novel non-tricyclic antidepressant. venlafaxine is a second generation antidepressant drug, has a neuropharmacologic profile distinct from that of existing antidepressants including tricyclic compounds, selective serotonin reuptake inhibitors and monoamine oxidase inhibitors. venlafaxine impart...
Stable isotopes are a primary tool for inferring past temperature changes and atmospheric moisture variability from ice cores. A 33m ice core representing the period 1850–2004 was retrieved from the Tanggula Mountains, central Tibetan Plateau (5743ma.s.l.), in August 2005. Annual average stable isotope (dO, dD) values generally increase during the period, while the second-order parameter of deu...
In French Polynesia, the four serotypes of dengue virus (DENV-1 to -4) have caused 14 epidemics since the mid-1940s. From the end of 2016, an increasing number of Pacific Island Countries and Territories have reported DENV-2 outbreaks and in February 2017, DENV-2 infection was detected in French Polynesia in three travellers from Vanuatu. As DENV-2 has not been circulating in French Polynesia s...
The historical pedigree and meaning of ‘‘information’’ has been hotly contested since its scientific definition in the 1940s. Scientists have authored very different explanations for the origins of informational research, the scope of information theory, and the historical significance of its findings. This survey classifies the historical literature into genres, offering a view into the changi...
The history and origins of proficiency testing of clinical laboratories are reviewed. Since the introduction of proficiency testing in the late 1940s, dramatic improvement in laboratory performance has been demonstrated. Nonetheless, the poor performance found two decades earlier was summoned to support the passage of the Clinical Laboratory Improvement Act of 1967 (CLIA '67).
The 1940s marked a turning point in the labor market history of AfricanAmerican women, characterized by sharp declines in agricultural and domestic service employment, a significant rise in formal sector employment, and large wage gains compared to white women. Using a semi-parametric technique, this paper examines the wage gains associated with changes in workers’ productive and personal chara...
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