Variation in Sensitivity of Aquatic Species to Toxicants: Practical Consequences for Effect Assessment of Chemical Substances

2000 ◽  
Vol 25 (4) ◽  
pp. 415-423 ◽  
Author(s):  
Manon A. Vaal ◽  
Cees J. Van Leeuwen ◽  
Janneke A. Hoekstra ◽  
Joop L. M. Hermens
Keyword(s):  
Aquatic Species ◽  
Chemical Substances ◽  
Effect Assessment

scholarly journals The ever-expanding limits of enzyme catalysis and biodegradation: polyaromatic, polychlorinated, polyfluorinated, and polymeric compounds

2020 ◽  
Vol 477 (15) ◽  
pp. 2875-2891
Author(s):  
Lawrence P. Wackett ◽  
Serina L. Robinson
Keyword(s):  
Enzyme Catalysis ◽  
Functional Group ◽  
Polyaromatic Hydrocarbons ◽  
Aquatic Species ◽  
Major Focus ◽  
Chemical Substances ◽  
Polyfluorinated Compounds ◽  
Living Things ◽  
Polymeric Compounds ◽  
Enzyme Reactivity

Biodegradation is simply the metabolism of anthropogenic, or otherwise unwanted, chemicals in our environment, typically by microorganisms. The metabolism of compounds commonly found in living things is limited to several thousand metabolites whereas ∼100 million chemical substances have been devised by chemical synthesis, and ∼100 000 are used commercially. Since most of those compounds are not natively found in living things, and some are toxic or carcinogenic, the question arises as to whether there is some organism somewhere with the enzymes that can biodegrade them. Repeatedly, anthropogenic chemicals have been denoted ‘non-biodegradable,’ only to find they are reactive with one or more enzyme(s). Enzyme reactivity has been organized into categories of functional group transformations. The discovery of new functional group transformations has continually expanded our knowledge of enzymes and biodegradation. This expansion of new-chemical biodegradation is driven by the evolution and spread of newly evolved enzymes. This review describes the biodegradation of widespread commercial chemicals with a focus on four classes: polyaromatic, polychlorinated, polyfluorinated, and polymeric compounds. Polyaromatic hydrocarbons include some of the most carcinogenic compounds known. Polychlorinated compounds include polychlorinated biphenyls (PCBs) and many pesticides of the twentieth century. Polyfluorinated compounds are a major focus of bioremediation efforts today. Polymers are clogging landfills, killing aquatic species in the oceans and increasingly found in our bodies. All of these classes of compounds, each thought at one time to be non-biodegradable, have been shown to react with natural enzymes. The known limits of enzyme catalysis, and hence biodegradation, are continuing to expand.

Evaluation of anti-pyretic activity of Dracaena sanderiana by Brewer’s yeast method

2020 ◽  
Vol 9 (2) ◽  
pp. 32-34
Author(s):  
Pavani C H
Keyword(s):  
Herbal Remedies ◽  
Standard Drug ◽  
Chemical Substances ◽  
Beneficial Effects ◽  
Potential Value ◽  
Plant Effects ◽  
Therapeutic Properties ◽  
Dracaena Sanderiana ◽  
Anti Inflammatory ◽  
Inflammatory Action

These medicinal plants are used to develop a therapy for the disease. To improve the science, investigate the scientific proof and activities validation, therefore the use of various herbal remedies for their pain-relieving and anti-inflammatory action in these current days. includes influence, anti-inflammatory, anti effect, analgesia, effects and some beneficial effects on the GI system. show the potential value of pain relief, cancer prevention and weight loss. According to these plant effects, consider that this present study was mainly based on to investigate and likely to reduce the fever caused by the outdoor and indoor. potential of is evidenced in leave studies. The medicinal plant produces a variety of chemical substances which shows significant therapeutic properties with the standard drug paracetamol.

A study on the variation of chemical substances in flue-cured tobaccos with different oil proportions

2014 ◽  
Vol 39 (5) ◽  
pp. 453-457
Author(s):  
Ke-su WEI ◽  
Yong-gao TU ◽  
Ze-min SONG ◽  
Wei-chang GAO ◽  
Yi CHEN
Keyword(s):  
Chemical Substances

scholarly journals Exosome-derived noncoding RNAs in gastric cancer: functions and clinical applications

2021 ◽  
Vol 20 (1) ◽  
Author(s):  
Xiao-Huan Tang ◽  
Ting Guo ◽  
Xiang-Yu Gao ◽  
Xiao-Long Wu ◽  
Xiao-Fang Xing ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Noncoding Rnas ◽  
Tumour Microenvironment ◽  
Clinical Applications ◽  
Biological Molecules ◽  
Biological Functions ◽  
Membrane Structures ◽  
Chemical Substances ◽  
Expression Levels ◽  
The Stability

AbstractExosomes are a subpopulation of the tumour microenvironment (TME) that transmit various biological molecules to promote intercellular communication. Exosomes are derived from nearly all types of cells and exist in all body fluids. Noncoding RNAs (ncRNAs) are among the most abundant contents in exosomes, and some ncRNAs with biological functions are specifically packaged into exosomes. Recent studies have revealed that exosome-derived ncRNAs play crucial roles in the tumorigenesis, progression and drug resistance of gastric cancer (GC). In addition, regulating the expression levels of exosomal ncRNAs can promote or suppress GC progression. Moreover, the membrane structures of exosomes protect ncRNAs from degradation by enzymes and other chemical substances, significantly increasing the stability of exosomal ncRNAs. Specific hallmarks within exosomes that can be used for exosome identification, and specific contents can be used to determine their origin. Therefore, exosomal ncRNAs are suitable for use as diagnostic and prognostic biomarkers or therapeutic targets. Regulating the biogenesis of exosomes and the expression levels of exosomal ncRNAs may represent a new way to block or eradicate GC. In this review, we summarized the origins and characteristics of exosomes and analysed the association between exosomal ncRNAs and GC development.

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