DNA synthesis has traditionally been beyond the home enthusiast or small amateur groups. Most DNA synthesis these days involves the phosphoramidite method. [17] This involves a number of hard to acquire and often toxic chemicals. Some work has been done to reduce the burden of expense of these special chemicals and increase throughput by printing lots of different DNA sequences on one surface o...

Halloysite nanotubes (HNTs) are a naturally-occurring aluminosilicate whose dimensions measure microns in length and tens of nanometers in diameter. Bonding defects between the alumina and silica lead to net negative and positive charges on the exterior and interior lumen, respectively. HNTs have been shown to enhance the material properties of polymer matrices and enable the sustained release ...

Inorganic ions, coenzymes, amino acids, and saccharides could co-exist with toxic environmental chemicals, such as polycyclic aromatic hydrocarbons (PAHs), in the cell. The presence of these co-existing chemicals can modulate the toxicity of the PAHs. One of the genotoxic effects by PAHs is light-induced cleavage, or photocleavage, of DNA. The effect of inorganic ions I-, Na+, Ca2+, Mg2+, Fe3+,...

Hidden liabilities arise when companies don't know or don't disclose the chemicals in their products and supply chains—omissions that can create uncertainty for investors. A new tool gives companies a way to talk about their performance in toxic chemicals management.

Skin diseases are a major occupational health issue in tannery workers because of workrelated exposure to various toxic chemicals used tanning process.

0001 When technological advances in the 1930s provided the means to synthesize chemicals from petroleum and natural gas, the petrochemical industry ramped up production of diverse species of novel compounds without testing their safety. By 1940, a billion pounds of synthetic petrochemicals were produced each year. Of the more than 38 million chemicals reported in the scientifi c literature, 80,...

A biosensor electrode system with unique configuration and a thin layer of immobilized yeast cells, set on the surface of an amperometric oxygen membrane electrode, was developed for rapid screening of toxic chemicals in a variety of pollution and process control applications. Measurement is based on the instantaneous detection of changes in oxygen respiratory activity of biofilm of yeast cells...

Persistent organic pollutants (POPs) have spread throughout the global environment to threaten human health and damage ecosystems, with evidence of POPs contamination in wildlife, human blood, and breast milk documented worldwide. Based on data from the US Food and Drug Administration, this article provides a brief overview of POPs residues in common foods in the United States food supply. The ...

Microbes in marine biofilms aggregated into clusters and increased the production of extracellular polymeric substances (EPS), by over 100% in some cases, when the seawater media containing toxic metals and chemicals, such as Cd(II), Cu(II), Pb(II), Zn(II), AI(III), Cr(III), glutaraldehyde, and phenol. The formation of microbial cluster and the increased production of EPS, which contained 84-92...

Schafer and Kegley bring up the important issue of excessive chemicals exposure of children. However, they do not consider in depth the "cumulative and simultaneous exposures faced by children, (.) moving beyond the chemical-by-chemical approach of the past", as quoted from the US Environmental Protection Agency national agenda to protect children from environmental health threats. Existing evi...