نتایج جستجو برای: unsaturated

تعداد نتایج: 16499  

Journal: :Organic & biomolecular chemistry 2010
Shunichi Kusumi Sainan Wang Tatsuya Watanabe Kaname Sasaki Daisuke Takahashi Kazunobu Toshima

2,3-Unsaturated-4-keto glycosyl acetates were found to exhibit low reactivity under several glycosylation conditions. Chemoselective glycosylations were effectively performed using 2,3-unsaturated glycosyl and 2,3-dideoxy glycosyl acetates as armed glycosyl donors, and 2,3-unsaturated-4-keto glycosyl acetates as disarmed glycosyl donors.

Journal: :The Journal of biological chemistry 2014
Yusuke Nakamichi Bunzo Mikami Kousaku Murata Wataru Hashimoto

Extracellular matrix molecules such as glycosaminoglycans (GAGs) are typical targets for some pathogenic bacteria, which allow adherence to host cells. Bacterial polysaccharide lyases depolymerize GAGs in β-elimination reactions, and the resulting unsaturated disaccharides are subsequently degraded to constituent monosaccharides by unsaturated glucuronyl hydrolases (UGLs). UGL substrates are cl...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1976
T Y Chang P R Vagelos

An unsaturated fatty acid-requiring mutant derived from Chinese hamster ovary (CHO) cells has been isolated and characterized. This mutant grows normally when oleate or other unsaturated fatty acids are supplemented in the growth medium. Unlike the wild-type CHO cells, growth stops when medium is deprived of unsaturated fatty acid. Whole cell pulse experiments with [14C]acetate or [14C]stearate...

2005
F. FELLOWS

1. The fatty acid composition of the ole-i and ole-i petite mutants of Saccharomyces cerevisiae was manipulated by growing the organism in the presence of defined supplements ofTween 80 or by allowing cells that had first been grown in the presence ofTween 80 to deplete their unsaturated fatty acids by subsequent growth in the absence of Tween 80. 2. The transition temperature ofArrhenius plots...

2014
Consolacion Y Ragasa Vincent Antonio Ng Jea Hun Park Dong Woo Kim Kimberly Cornelio Chien-Chang Shen

Chemical investigation of the dichloromethane extract of the leaves of Artocarpus altilis yielded βsitosterol (1), unsaturated triglycerides (2), squalene (3), polyprenol (4), lutein (5) and unsaturated fatty acids. The structures of 1-5 were identified by comparison of their 1 H and/or 13 C NMR data with those reported in the literature. Chemical investigation of the dichloromethane extract of...

2017
Anastassia Matviitsuk Mark D Greenhalgh Diego-Javier Barrios Antúnez Alexandra M Z Slawin Andrew D Smith

A new general concept for α,β-unsaturated acyl ammonium catalysis is reported that uses p-nitrophenoxide release from an α,β-unsaturated p-nitrophenyl ester substrate to facilitate catalyst turnover. This method was used for the enantioselective isothiourea-catalyzed Michael addition of nitroalkanes to α,β-unsaturated p-nitrophenyl esters in generally good yield and with excellent enantioselect...

Journal: :Blood 1984
D E MacIntyre R L Hoover M Smith M Steer C Lynch M J Karnovsky E W Salzman

The uptake of free fatty acids has previously been shown to affect the capping of lymphocytes, and there is evidence that different types of fatty acids may partition into separate lipid domains in cell surface membranes. In studies of gel-filtered human platelets, we found that cis-unsaturated fatty acids (1-35 microM) inhibited platelet shape change, aggregation, and secretion of 5-hydroxytry...

Journal: :Journal of the Japan Society of Colour Material 1959

Journal: :British medical journal 1982
K J Sheppard D A Bradbury J M Davies D R Ryrie

Ten (9.3%) of 107 patients with hepatocellular carcinoma had considerably increased serum unsaturated vitamin B12 binding capacity. All 10 were young (mean 12 years), had no serum alpha-fetoprotein, and no underlying cirrhosis; all had a longer survival compared with patients without increased serum unsaturated vitamin B12 binding capacity in the study. Seven of the 10 patients had fibrolamella...

2008
Yoichiro Kuninobu Yuta Nishina Atsushi Kawata Makoto Shouho Kazuhiko Takai

Rhenium complex, [ReBr(CO)3(thf)]2-catalyzed reactions between aromatic imines and either acetylenes or α,β-unsaturated carbonyl compounds gave indene derivatives in good to excellent yields. These reactions proceed via C–H bond activation, insertion of acetylenes or α,β-unsaturated carbonyl compounds, intramolecular nucleophilic cyclization, and reductive elimination. Indene derivatives were a...

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