Results 201 to 210 of about 101,742 (249)

Synthesis of the C1−C23 Fragment of Spirastrellolide A

Organic Letters, 2008
Synthesis of the C1-C23 fragment in spirastrellolide A is described, featuring a cyclic acetal-tethered RCM for stereoselective constructions of spiroketal, and a 1,3- anti aldol involving methyl ketone enolate and Mukaiyama conditions.
Jin-Haek, Yang, Jia, Liu, Richard P, Hsung   +2 more
exaly   +3 more sources

A C23-type Modification of ThAs2

Nature, 1966
ThAs2 was reported to crystallize in the tetragonal Cu2Sb or C38 type of structure1. In an attempt to synthesize this phase by reacting arsenic with thorium powder at temperatures between 600° and 900° C, a new modification was obtained. This low-temperature form α-ThAs2 is orthorhombic and of the C23 type. Its lattice constants are:
exaly   +2 more sources

Synthesis of the C13-C23 Segment of Tedanolide

Synlett, 2005
AbstractFor Abstract see ChemInform Abstract in Full Text.
Gunnar Ehrlich, Markus Kalesse
openaire   +1 more source

Nucleolin (C23), a physiological substrate for casein kinase II

Biochemical and Biophysical Research Communications, 1988
Nucleolin (C23), a 110 kDa phosphoprotein, which is mainly found in the nucleolus has been shown to be a physiological substrate for casein kinase II (CKII). Nucleolin was identified and characterized by immunodetection using an anti-nucleolin antibody.
Schneider, H R, Issinger, O G
openaire   +3 more sources

Localization of phosphoprotein C23 in nucleoli by immunological methods

Experimental Cell Research, 1981
Abstract Antiserum to a major phosphorylated nucleolar protein. C23 (MW 103000, pI 5.2) from Novikoff hepatoma was produced in rabbits. By immunodiffusion analysis, the antiserum produced precipitin bands and with various crude extracts of nucleoli, but not with extranucleolar or cytosol fractions.
M O, Olson, K, Guetzow, H, Busch
openaire   +2 more sources

Synthesis and Structural Revision of Symbiodinolide C23−C34 Fragment

The Journal of Organic Chemistry, 2009
Stereoselective synthesis of the C23-C34 fragment of symbiodinolide, which possesses the originally proposed stereochemistry, and its diastereomers was achieved in 19 steps from L-aspartic acid, respectively. Comparison of spectroscopic data of the synthetic products with those of the degraded product of symbiodinolide led to a structural revision of ...
Takeshi, Murata, Masayuki, Sano, Hiroyoshi, Takamura, Isao, Kadota, Daisuke, Uemura   +4 more
openaire   +2 more sources

Association of protein C23 with rapidly labeled nucleolar RNA

Biochemistry, 1986
The association of nucleolar phosphoprotein C23 with preribosomal ribonucleoprotein (RNP) particles was examined in Novikoff hepatoma nucleoli. RNA was labeled with [3H]uridine for various times in cell suspensions, and RNP particles were extracted from isolated nucleoli and fractionated by sucrose gradient ultracentrifugation.
A H, Herrera, M O, Olson
openaire   +2 more sources

Chemoenzymatic Synthesis of the C10−C23 Segment of Dictyostatin

Organic Letters, 2006
[reaction: see text] Employing enzymatic desymmetrization and resolution, respectively, the two aldehydes 8 and 20 were prepared. The precursor to aldehyde 8, meso-2,4-dimethylglutaric anhydride 3, could be obtained by base treatment of the diastereomeric mixture. Aldehyde 8 was extended to alkyne 10 by a Marshall reaction introducing four carbon atoms.
Evgeny, Prusov, Hartmut, Röhm, Martin E, Maier   +2 more
openaire   +2 more sources

Synthesis of the C23–C32 fragment of spirangien

Tetrahedron Letters, 2007
Abstract The synthesis of the C23–C32 fragment of spirangien A is reported using Evans’ alkylation, Evans–Metternich aldol reaction and a substrate controlled stereoselective reduction.
Michael Lorenz, Markus Kalesse
openaire   +1 more source

Simulation of multiple ordered phases in C23 n-alkane

The Journal of Chemical Physics, 2011
Normal alkanes display multiple ordered phases, including an orthorhombic crystal (X) and two partially ordered rotator phases (RI and RII). The rotator phase transitions X–RI and RI–RII are of interest because they are weakly first-order, and because experiments suggest that crystalline polyethylene may nucleate via a metastable rotator phase. We have
Nathaniel, Wentzel, Scott T, Milner
openaire   +2 more sources