نتایج جستجو برای: i19 c23
تعداد نتایج: 975 فیلتر نتایج به سال:
Steroidal sapogenins bearing a good leaving group at C23 undergo a completely stereospecific rearrangement under a variety of conditions via a mechanism involving neighboring-group participation by the acetal oxygen atom in the departure of the nucleofuge from C23. The reactions of equatorial (23S)-23-bromo- or (23S)-23-tosyloxyspirostanes with either the alpha (25R) or beta (25S) oriented 25-m...
A transcriptional attenuation mechanism regulates expression of the bacterial tnaCAB operon. This mechanism requires ribosomal arrest induced by the regulatory nascent TnaC peptide in response to free L-tryptophan (L-Trp). In this study we demonstrate, using genetic and biochemical analyses, that in Escherichia coli, TnaC residue I19 and 23S rRNA nucleotide A2058 are essential for the ribosome'...
Among terrestrial orchids, and particularly among the subtribe Orchidinae, flies are underrepresented as pollinators. The European Neotinea ustulata, which developed specialized pollination by tachinid flies, is known to produce high relative concentrations of floral cuticular alkenes (Z)-11-tricosene (Z)-11-pentacosene (referred (Z)-11-C23/C25enes), seem be uncommon orchid flowers. If evolutio...
has extensive and well-developed Golgi apparatus. This is particularly important in the application of C23/11 as a fusion partner in human monoclonal antibody production. The electron micrograph studies also confirmed this excentric nucleation pattern. lrnmunohistochemical analysis of the paraproteins secreted by C23/11 showed that both K and 1 chains were present. Some reports have shown that ...
To determine whether red blood cell-mediated microinjection of antibodies can be used to study nuclear protein localization and function, we microinjected antibodies that have been shown to react specifically with nucleolar acidic phosphoprotein C23 into Walker 256 cells. The intracellular distribution of microinjected anti-C23 antibodies and preimmune immunoglobulins were determined by immunof...
We prove that the maximal singular fibres of elliptic K3 surfaces have type I19 and I∗ 14 unless the characteristic of the ground field is 2. In characteristic 2, the maximal singular fibres are I18 and I ∗ 13. The paper supplements work of Shioda in [9] and [10]. MSC (2000): 11G25, 14J27, 14J28.
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