نتایج جستجو برای: chemicals
تعداد نتایج: 44495 فیلتر نتایج به سال:
PURPOSE OF REVIEW Epigenetics investigates heritable changes in gene expression occurring without changes in DNA sequence. Several epigenetic mechanisms, including DNA methylation, histone modifications, and microRNA expression, can change genome function under exogenous influence. Here, we review current evidence indicating that epigenetic alterations mediate toxicity from environmental chemic...
The design and development of greener processes that are safe and friendly is an irreversible trend that is driven by sustainable and economic issues. The use of Biocatalysis as part of a manufacturing process fits well in this trend as enzymes are themselves biodegradable, require mild conditions to work and are highly specific and well suited to carry out complex reactions in a simple way. Th...
Fuel cells are receiving widespread attention as an alternate source for clean energy, and one of the most important developments are proton-exchange membrane fuel cells (PEMFC) which operate using hydrogen at low temperatures. In the U.S., there is a considerable effort underway to develop H2 as the preferred fuel due to the potential for decreasing our dependence on imported oil, and the envi...
‘Contamination’ is a comparative term. In Britain at least, contaminants are trace substances; in the context of food they are distinguished from additives by whether or not there is an intention that the substances should be present when the food is consumed or prepared for consumption. Contaminants may be of natural or of technological origin: and technological contaminants may be direct or i...
Endocrine disruptor compounds are exogenous agents able to interfere with a gland function, exerting their action across different functional passages, from the synthesis to the metabolism and binding to receptors of the hormone produced. Several issues, such as different levels and time of exposure and different action across different ages as well as gender, make the study of endocrine disrup...
Synthesis gas, that consists largely of carbon monoxide, carbon dioxide and hydrogen, has been used in a process to make the commodity chemical, 2-hydroxybutyric acid. This news report discusses a proposal to alter regulations of materials and products involved in using synthetic biology to make chemicals. Genetic engineering can be complex and time consuming. This research paper describes an a...
The idea that xenobiotic chemicals could inappropriately modlate the endocrine system thereby causing detrimental effects n wildlife and humans was first proposed 20 years ago at the atershed Wingspread Conference [1,2]. These endocrine disruptng chemicals (EDCs) have long been controversial, with a great eal of discussion raging in the scientific literature. Much of this ontroversy has centere...
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