?-Glucosidase genes of naturally occurring and cellulolytic Streptomyces species: characterization of two such genes in Streptomyces lividans

1989 ◽  
Vol 30 (5) ◽  
Author(s):  
Bengt�ke Jaurin ◽  
Micael Granstr�m
Keyword(s):  
Streptomyces Lividans ◽  
Streptomyces Species ◽  
Naturally Occurring

High Resolution Replication of Organoclay Surfaces

1982 ◽  
Vol 40 ◽  
pp. 576-577
Author(s):  
W. W. Barker ◽  
W. E. Rigsby ◽  
V. J. Hurst ◽  
W. J. Humphreys
Keyword(s):  
Clay Mineral ◽  
Organic Molecule ◽  
Organic Molecules ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Naturally Occurring ◽  
Silicate Layers ◽  
Mineral Identification

Experimental clay mineral-organic molecule complexes long have been known and some of them have been extensively studied by X-ray diffraction methods. The organic molecules are adsorbed onto the surfaces of the clay minerals, or intercalated between the silicate layers. Natural organo-clays also are widely recognized but generally have not been well characterized. Widely used techniques for clay mineral identification involve treatment of the sample with H2 O2 or other oxidant to destroy any associated organics. This generally simplifies and intensifies the XRD pattern of the clay residue, but helps little with the characterization of the original organoclay. Adequate techniques for the direct observation of synthetic and naturally occurring organoclays are yet to be developed.

Characterization of clinical, biochemical and adrenal hormonal effects of ATR-101, a selective ACAT1 antagonist, in dogs with naturally-occurring Cushing's syndrome

2016 ◽  
Author(s):  
Stephen Hunt ◽  
Michele Fritz ◽  
William Schall ◽  
Olivier N. Bari ◽  
Rebecca Smedley ◽  
...  
Keyword(s):  
Cushing’S Syndrome ◽  
Cushing's Syndrome ◽  
Hormonal Effects ◽  
Naturally Occurring

Characterization of a carboxylesterase with hyper-thermostability and alkali-stability from Streptomyces lividans TK24

Extremophiles ◽  
2021 ◽  
Author(s):  
Xin Chang ◽  
Shuang Wu ◽  
Jie Chen ◽  
Shengqi Xiong ◽  
Peng Wang ◽  
...  
Keyword(s):  
Streptomyces Lividans ◽  
Alkali Stability

scholarly journals Exploiting the Amazing Diversity of Natural Source-Derived Polysaccharides: Modern Procedures of Isolation, Engineering, and Optimization of Antiviral Activities

Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 136
Author(s):  
Bimalendu Ray ◽  
Martin Schütz ◽  
Shuvam Mukherjee ◽  
Subrata Jana ◽  
Sayani Ray ◽  
...  
Keyword(s):  
Structural Characteristics ◽  
Antiviral Drug ◽  
Natural Source ◽  
Target Interaction ◽  
Charge Densities ◽  
Linkage Pattern ◽  
Naturally Occurring ◽  
Antiviral Activities ◽  
One Step

Naturally occurring polysaccharide sulfates are highly diverse, owning variations in the backbone structure, linkage pattern and stereochemistry, branching diversity, sulfate content and positions of sulfate group(s). These structural characteristics bring about diverse sulfated polymers with dissimilar negative charge densities and structure–activity relationships. Herein, we start with a short discussion of techniques needed for extraction, purification, chemical sulfation, and structural characterization of polysaccharides. Processes of isolation and sulfation of plant-derived polysaccharides are challenging and usually involve two steps. In this context, we describe an integrated extraction-sulfation procedure that produces polysaccharide sulfates from natural products in one step, thereby generating additional pharmacological activities. Finally, we provide examples of the spectrum of natural source-derived polysaccharides possessing specific features of bioactivity, in particular focusing on current aspects of antiviral drug development and drug–target interaction. Thus, the review presents a detailed view on chemically engineered polysaccharides, especially sulfated derivatives, and underlines their promising biomedical perspectives.

scholarly journals Discovery and characterization of naturally occurring potent inhibitors of catechol-O-methyltransferase from herbal medicines

RSC Advances ◽  
2021 ◽  
Vol 11 (17) ◽  
pp. 10385-10392
Author(s):  
Dong-Fang Zhao ◽  
Yu-Fan Fan ◽  
Fang-Yuan Wang ◽  
Fan-Bin Hou ◽  
Frank J. Gonzalez ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Herbal Medicines ◽  
Disease Treatment ◽  
Naturally Occurring

Discovery and characterization of natural human catechol-O-methyltransferase (hCOMT) inhibitors for Parkinson's disease treatment.

Functional and Biochemical Characterization of Immunologically Derived Equine Platelet-Activating Factor

1985 ◽  
Vol 22 (4) ◽  
pp. 375-386 ◽  
Author(s):  
H. C. Wimberly ◽  
D. O. Slauson ◽  
N. R. Neilsen
Keyword(s):  
Functional Activity ◽  
Biochemical Characterization ◽  
Platelet Activating Factor ◽  
Biochemical Properties ◽  
Naturally Occurring ◽  
Rabbit Platelets ◽  
Rapid Reaction ◽  
Specific Challenge

Antigen-specific challenge of equine leukocytes induced the non-lytic release of a platelet-activating factor in vitro. The equine platelet-activating factor stimulated the release of serotonin from equine platelets in a dose-responsive manner, independent of the presence of cyclo-oxygenase pathway inhibitors such as indomethacin. Rabbit platelets were also responsive to equine platelet-activating factor. The release of equine platelet-activating factor was a rapid reaction with near maximal secretion taking place in 30 seconds. Addition of equine platelet-activating factor to washed equine platelets stimulated platelet aggregation which could not be inhibited by the presence of aspirin or indomethacin. Platelets preincubated with equine platelet-activating factor became specifically desensitized to equine platelet-activating factor while remaining responsive to other platelet stimuli such as collagen and epinephrine. The following biochemical properties of equine platelet-activating factor are identical to those properties of 1-0-alkyl-2-acetyl-sn-glyceryl-3-phosphorylcholine (AGEPC): stability upon exposure to air and acid; loss of functional activity after basecatalyzed methanolysis with subsequent acylation that returned all functional activity; and identical relative mobilities on silica gel G plates developed with chloroform:methanol:water (65:35:6, volume/volume). The combined functional and biochemical characteristics of equine platelet-activating factor strongly suggest identity between this naturally occurring, immunologically derived equine factor and AGEPC.

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