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1990 76 : 1704 - 1709
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The oocyte (maternal) nucleolus is essential for early embryonic development and embryos originating from enucleolated oocytes arrest at the 2-cell stage. The reason for this is unclear. Surprisingly, RNA polymerase I activity in nucleolus-less mouse embryos, as manifested by pre-rRNA synthesis, and pre-rRNA processing are not affected, indicating an unusual role of the nucleolus. We report her...
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The authentication requirements of computing systems and network protocols vary greatly with their intended use, accessibility, and their network connectivity. This document describes a spectrum of authentication technologies and provides suggestions to protocol developers on what kinds of authentication might be suitable for some kinds of protocols and applications used in the Internet. It is ...
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WD1704+481 is a visual binary in which both components are white dwarfs. We present spectra of the Hα line of both stars which show that one component (WD1704+481.2 = Sanduleak B = GR577) is a close binary with two white dwarf components. Thus, WD1704+481 is the first known triple degenerate star. From radial velocity measurements of the close binary we find an orbital period of 0.1448d, a mass...
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distance, in noninfected organs. infected B cells influence T cells located at draining the site of inoculation, and the Murine AIDS is initiated in the lymph nodes
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ژورنال
عنوان ژورنال: Synthesis
سال: 2004
ISSN: 0039-7881,1437-210X
DOI: 10.1055/s-2004-836986