Biological effects and chemical characterization of Iris schachtii Markgr. extracts: A new source of bioactive constituents

2018 ◽  
Vol 112 ◽  
pp. 448-457 ◽  
Author(s):  
Andrei Mocan ◽  
Gokhan Zengin ◽  
Adriano Mollica ◽  
Ahmet Uysal ◽  
Erdogan Gunes ◽  
...  
Keyword(s):  
Biological Effects ◽  
Chemical Characterization ◽  
Bioactive Constituents

Chemical characterization of organic microcontaminant sources and biological effects in riverine sediments impacted by urban sewage and pulp mill discharges

Chemosphere ◽  
2013 ◽  
Vol 90 (2) ◽  
pp. 611-619 ◽  
Author(s):  
S. Chamorro ◽  
V. Hernández ◽  
V. Matamoros ◽  
C. Domínguez ◽  
J. Becerra ◽  
...  
Keyword(s):  
Biological Effects ◽  
Chemical Characterization ◽  
Pulp Mill ◽  
Urban Sewage ◽  
Riverine Sediments

Isolation and chemical characterization of agelaiatoxin8 (AvTx8) from Agelaia vicina wasp venom and its biological effects on GABA neurotransmission

2017 ◽  
Vol 31 (10) ◽  
pp. e21941 ◽  
Author(s):  
Andrea B. Pizzo ◽  
Renê O. Beleboni ◽  
Ruither O. Gomes Carolino ◽  
Luciana de Oliveira ◽  
Antonio Miranda ◽  
...  
Keyword(s):  
Biological Effects ◽  
Chemical Characterization ◽  
Wasp Venom ◽  
Gaba Neurotransmission

Chemical characterization of main bioactive constituents in Paeonia ostii seed meal and GC‐MS analysis of seed oil

2019 ◽  
Vol 44 (1) ◽  
Author(s):  
Xiao Tian ◽  
Sen Guo ◽  
Shanshan Zhang ◽  
Peisheng Li ◽  
Tianyi Wang ◽  
...  
Keyword(s):  
Seed Oil ◽  
Chemical Characterization ◽  
Seed Meal ◽  
Bioactive Constituents ◽  
Ms Analysis

scholarly journals Mediation of Elicitin Activity on Tobacco Is Assumed by Elicitin-Sterol Complexes

2001 ◽  
Vol 12 (9) ◽  
pp. 2825-2834 ◽  
Author(s):  
Hanan Osman ◽  
Sébastien Vauthrin ◽  
Vladimir Mikes ◽  
Marie-Louise Milat ◽  
Franck Panabières ◽  
...  
Keyword(s):  
Binding Sites ◽  
Defense Mechanisms ◽  
Specific Binding ◽  
Biological Effects ◽  
Chemical Characterization ◽  
Site Directed Mutagenesis ◽  
Specific Binding Sites ◽  
Biological Responses ◽  
Kinetics Of

Elicitins secreted by phytopathogenic Phytophthoraspp. are proteinaceous elicitors of plant defense mechanisms and were demonstrated to load, carry, and transfer sterols between membranes. The link between elicitor and sterol-loading properties was assessed with the use of site-directed mutagenesis of the 47 and 87 cryptogein tyrosine residues, postulated to be involved in sterol binding. Mutated cryptogeins were tested for their ability to load sterols, bind to plasma membrane putative receptors, and trigger biological responses. For each mutated elicitin, the chemical characterization of the corresponding complexes with stigmasterol (1:1 stoichiometry) demonstrated their full functionality. However, these proteins were strongly altered in their sterol-loading efficiency, specific binding to high-affinity sites, and activities on tobacco cells. Ligand replacement experiments strongly suggest that the formation of a sterol-elicitin complex is a requisite step before elicitins fasten to specific binding sites. This was confirmed with the use of two sterol-preloaded elicitins. Both more rapidly displaced labeled cryptogein from its specific binding sites than the unloaded proteins. Moreover, the binding kinetics of elicitins are related to their biological effects, which constitutes the first evidence that binding sites could be the biological receptors. The first event involved in elicitin-mediated cell responses is proposed to be the protein loading with a sterol molecule.

Chemical characterization of the main bioactive constituents from fruits of Ziziphus jujuba

2016 ◽  
Vol 7 (6) ◽  
pp. 2870-2877 ◽  
Author(s):  
Lu Bai ◽  
Hai Zhang ◽  
Qingchao Liu ◽  
Yong Zhao ◽  
Xueqin Cui ◽  
...  
Keyword(s):  
Chemical Characterization ◽  
Bioactive Constituents ◽  
History Of ◽  
Ziziphus Jujuba

The fruit of Ziziphus jujuba Mill., also called hongzao in Chinese, has a long history of cultivation in China.

Olfactory and Chemical Characterization of Indoor Air-Towards a Psychophysical Model for Air Quality

1981 ◽  
Author(s):  
Birgitta Berglund ◽  
Ulf Berglund ◽  
Thomas Lindvall ◽  
Helene Nicander-Bredberg
Keyword(s):  
Air Quality ◽  
Indoor Air ◽  
Chemical Characterization

PURIFICATION AND PARTIAL CHEMICAL CHARACTERIZATION OF SHEEP NEUROPHYSIN

1973 ◽  
Vol 74 (2) ◽  
pp. 226-236 ◽  
Author(s):  
Michel Chrétien ◽  
Claude Gilardeau
Keyword(s):  
Amino Acid ◽  
Polyacrylamide Gel Electrophoresis ◽  
Chemical Characterization ◽  
Terminal Amino Acid ◽  
Amino Acid Determination ◽  
Pituitary Glands ◽  
Terminal Amino ◽  
Partial Chemical ◽  
Acid Determination

ABSTRACT A protein isolated from ovine pituitary glands has been purified, and its homogeneity assessed by NH2- and COOH-terminal amino acid determination, ultracentrifugation studies, and polyacrylamide gel electrophoresis after carboxymethylation. Its chemical and immunochemical properties are closely similar to those of beef and pork neurophysins, less similar to those of human neurophysins. It contains no tryptophan (like other neurophysins) or histidine (like all except bovine neurophysin-I and human neurophysins). It has alanine at the NH2-terminus and valine at the COOH-terminus. Its amino acid composition is similar to, but not identical with those of porcine and bovine neurophysins.

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