Diaziquone [AZQ, 2,5-bis(carboethoxyamino)-3,6-diaziridinyl-1,4-benzoquinone] has been investigated for its toxicity toward Chinese hamster ovary cells AA8-4 under both aerobic and hypoxic conditions. Under acute (1-5 h) exposures to 2.5-10 microM AZQ in alpha-medium plus 10% fetal calf serum, AZQ showed an approximately linear concentration x time dependency for cell killing which was 3-4 time...

In this article, polyphosphate-accumulating organisms (PAOs) from a lab-scale continuous-flow two-sludge system was isolated and identified, the different phosphorus accumulation characteristics of the isolates under anoxic and aerobic conditions were investigated. Two kinds of PAOs were both found in the anoxic zones of the two-sludge system, one of them utilized only oxygen as electron accept...

" The nature and etiology of leukemia are unknown " (1). Some authors (2, 3, 4, 5, 6, 7, 8) are in favor of classifying the leukemias as malignant neoplasms of the blood-forming organs, because of the formation of leukocytes in unaccustomed organs, the new growth of leukemic tissue, and the flooding of the blood stream with abnormal primitive cells. Others (9) prefer to consider leukemia as a t...

Partial nitrification was reported to be technically feasible and economically favorable, especially for wastewaterwith high ammonium concentration or low C/N ratio. In this study, the effect of dissolved oxygen (DO)and influent ratio of chemical oxygen demand to nitrogen (COD/N) ratio on biological nitrogen removal fromsynthetic wastewater was investigated. Experiments were c...

background anaerobic-inducible promoters are alternatives of chemical-inducible promoters for expression of recombinant proteins especially in conditions where chemical induction is not possible or anaerobic conditions are preferable. the nirb promoter is the promoter of the first gene of nir operon in escherichia coli, which encodes nadh-dependent nitrite reductase. this promoter is naturally ...

Dehydrogenation of (partially) saturated heterocycles provides an important route to heteroaromatic compounds. A heterogeneous cobalt oxide catalyst, previously employed for aerobic oxidation of alcohols and amines, is shown to be effective for aerobic dehydrogenation of various 1,2,3,4-tetrahydroquinolines to the corresponding quinolines. The reactions proceed in good yields under mild conditi...