| effects of americium-241 and humic substances on photobacterium phosphoreum: bioluminescence and diffuse reflectance ftir spectroscopic studies. | the integral bioluminescence (bl) intensity of live photobacterium phosphoreum cells (strain 1883 ibso), sampled at the stationary growth stage (20 h), was monitored for further 300 h in the absence (control) and presence of (241)am (an α-emitting radionuclide of a high specific activity) in the growth medium. the activity concentration of (241)am was 2 kbq l(-1); [(241)am]=6.5×10(-11) m. parallel experiments were also performed with water-soluble humic substances (hs, 2.5 mg l(-1); containing o ... | 2013 | 22795580 |
| model of hormesis and its toxicity mechanism based on quorum sensing: a case study on the toxicity of sulfonamides to photobacterium phosphoreum. | during the past two decades, the phenomenon of hormesis has gained increasing recognition in environmental and toxicological communities. however, the mechanistic understanding of hormesis, to date, is extremely limited. herein is proposed a novel parametric model with a mechanistic basis and two model-based parameters for hormesis that was successfully applied to the hormetic dose-response observed in the chronic toxicity of sulfonamides on photobacterium phosphoreum. on the basis of the method ... | 2012 | 22715968 |
| 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 |
| 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 |