| photolysis of chlortetracycline in aqueous solution: kinetics, toxicity and products. | the aqueous photodegradation of the widely used antibiotic chlortetracycline (ctc) was investigated under simulated sunlight. the quantum yield of photodegradation increased from 3.3 x 10(-4) to 8.5 x 10(-3) within the ph range of 6.0 to 9.0. the presence of ca2+, fe3+, and no(-3) enhanced the photodegradation of ctc, whereas mg2+, mn2+, and zn2+ inhibited the degradation with the order mn2+ > zn2+ > mg2+ at ph 7.3. the monovalent cations (na+ and k+) had negligible effect on the photolysis of c ... | 2012 | 22655385 |
| quantitative structure-activity relationship for prediction of the toxicity of phenols on photobacterium phosphoreum. | quantitative structure-activity relationships (qsar) is an alternative to experimental toxicity testing and recommended by environmental protection agencies. in this background, an accurate and reliable qsar model of 18 phenols for their toxicity to photobacterium phosphoreum was developed using mechanistically interpretable molecular structural descriptors. the qsar model was developed by stepwise multiple linear regression and the reliability of the model was evaluated by internal and external ... | 2012 | 22562268 |
| influence factors of multicomponent mixtures containing reactive chemicals and their joint effects. | organic chemicals usually coexist as a mixture in the environment, and the mixture toxicity of organic chemicals has received increased attention. however, research regarding the joint effects of reactive chemicals is lacking. in this study, we examined two kinds of reactive chemicals, cyanogenic toxicants and aldehydes and determined their joint effects on photobacterium phosphoreum. three factors were found to influence the joint effects of multicomponent mixtures containing reactive chemicals ... | 2012 | 22503635 |
| detection of heavy metal resistance bioluminescence bacteria using microplate bioassay method. | effects of different heavy metals on vibrio harveyi, v. fischeri, photobacterium phosphoreum and p. leiognathi were examined. checkerboard assay was used for the detection of the natural metal tolerance levels of a large number of marine luminous eubacteria. 57 strains of luminous bacteria were investigated for their natural patterns of heavy metal tolerance. the behaviors of these strains were not homogeneous with respect to all metals tested, even within the strains belonging to the same genus ... | 2012 | 23741856 |
| toxicity-based assessment of the treatment performance of wastewater treatment and reclamation processes. | the reclamation and reuse of wastewater is one of the possible ways to relieve the serious fresh water resource crisis in china. efficient reclamation treatment technologies ensure the safe reuse of reclaimed water. in order to screen out and evaluate technologies appropriate for reclamation treatment, a great deal of efforts have been brought to bear. in the present study, a toxicity-based method including a photobacterium phosphoreum test for acute toxicity and sos/umu test for genotoxicity, a ... | 2012 | 23505863 |
| toxicological investigation of soils with the solid-phase flash assay: comparison with other ecotoxicological tests. | a new direct-contact toxicity test, the solid-phase flash assay, which utilises photobacteria in direct contact with soil particles during the exposure, was evaluated on four soil samples. samples htnt1 and htnt2 originated from former military sites in germany, and were highly contaminated with nitroaromatics (approximately 20g/kg), lead and polycyclic aromatic hydrocarbons. samples lmkw1 and lmkw2, from bioremediation stacks in germany, were mainly contaminated with mineral oils. the solid-pha ... | 2014 | 25419927 |
| immunological relationships of glutamine synthetases from marine and terrestrial enterobacteria. | glutamine synthetase (gs) frombeneckea alginolytica strain 90 was purified to homogeneity as indicated by sodium dodecyl sulface polyacrylamide gel electrophoresis. the purified enzyme was injected into rabbits, and the antiserum, as well as previously prepared antiserum against the gs fromescherichia coli, was used in ouchterlony double diffusion experiments. from the results of these studies, the marine and terrestrial enterobacteria could be separated into five major groups consisting of (i)b ... | 1980 | 27520760 |