As newly developed inorganic materials, semiconductor nanocrystals (NCs), or quantum dots (QDs), have received considerable attention because of their unique nano-related properties including high quantum yield, simultaneous excitation with multiple fluorescence colors, and electrochemical properties. This review presents a general description of the electrochemical properties of QDs with their...

The alkyl fluorophosphonate grou,p of composunds has attracted much attention recently, and its most active member, di-isopropyl fluorophosphonate, has now been the subject of some published work. The substance has the formula given below. It is a clear colourless liquid, purified by redistillation, slightly soluble in water, but readily soluble in organic solvents. Aqueous solutions are unstab...

A xenobiotic can be defined as any chemical or other substance that is not normally found in the ecosystems or that is present at concentrations harmful to all biological organisms. This general definition could be applied to anthropogenic and naturally occurring constituents. Organic contaminants can include pesticides, solvents and petroleum products. Inorganic xenobiotics include heavy metal...

The term ‘Enzyme’ came from the Greek word ‘Enzymos’ means ‘In the cells or Ferments’. These are naturally available, high molecular weight proteins, capable of catalyzing chemical reaction of biological process and therefore popular as ‘Biocatalyst’. Enzymes are soluble organic substance, produced by living organisms whose different amino acids form long poly peptide chains (-HN-R-CONH-R-CO-)n...

gastric juice or mineral acids }11to a proteid and another substance which gives :io proteid reaction. This contains all the iodine (about 14 %) and is known as iodo-thyrin. Very little is known about its chemistry beyond that it is not a proteid, and that it contains all the iodine in organic combination. The iodine found in iodo-thyrin must certainly be derived from the food, but the mere tra...

Dissolved organic carbon (DOC) and total dissolved nitrogen (TDN) are generally considered important active biogeochemical pools of total carbon and nitrogen. Many studies have documented the contributions of soil fauna to litter decomposition, but the effects of the soil fauna on labile substances (i.e., DOC and TDN) in litter during early decomposition are not completely clear. Therefore, a f...

Modelling the cloud condensation nucleus activity of organic acids Z. Varga, G. Kiss, and H.-C. Hansson Department of Earth and Environmental Sciences at University of Pannonia, Egyetem u. 10, 8200 Veszprém, Hungary Air Chemistry Group of the Hungarian Academy of Sciences, University of Pannonia, P.O. Box 158, 8201 Veszprém, Hungary Institute of Applied Environmental Research, Stockholm Univers...

The present study evaluated 105 clients who were assessed for substance-related problems and a history of domestic violence. A brief survey on family violence examined whether clients were adult victims, childhood victims, and/or perpetrators of physical violence. Results indicated that 37% of the sample reported that they experienced a family history of physical violence. A total of 22% report...

We studied the urinary excretion of organic acids by normal human subjects in an ambulant normal population, chosen without conscious bias. Quantitative ranges and frequency distribution patterns of excretion are reported, as a basis on which to compare results obtained for patients whose clinical condition suggests that their excretion values may be abnormal. The quantitative valuse we observe...