نتایج جستجو برای: 1849
تعداد نتایج: 1488 فیلتر نتایج به سال:
Author's abstract Vesico-vaginalfistula (VVF) was a common ailment among American women in the 19th century. Prior to that time, no successful surgery had been developed for the cure of this condition until DrJ Marion Sims perfected a successful surgical technique in 1849. Dr Sims usedfemale slaves as research subjects over a four-year period of experimentation (1845-1849). This paper discusses...
In the course of two trips to Central America (June 1967 and JulyAugust 1976) I had the opportunity of collecting topotypic specimens of Planorbis nicaraguanus Morelet, 1849, anatomically defined in this paper, and of P. yzabalensis Crosse & Fischer, 1879, the identity of the latter with Drepanotrema anatinum (Orbigny, 1835) is confirmed. The following planorbid species were also found: Helisom...
Standard Reference Material (SRM) 1849 Infant/Adult Nutritional Formula has been issued by the National Institute of Standards and Technology (NIST) as a replacement for SRM 1846 Infant Formula, issued in 1996. Extraction characteristics of SRM 1846 have changed over time, as have NIST's analytical capabilities. While certified mass fraction values were provided for five constituents in SRM 184...
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