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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Ou-Yang, Hui-Ling Kong, Xiang-Zhen Lavoie, Michel He, Wei Qin, Ning He, Qi-Shuang Yang, Bin Wang, Rong Xu, Fu-Liu |
| Description | Country affiliation: China Author Affiliation: Ou-Yang HL ( MOE Laboratory for Earth Surface Process, College of Urban & Environmental Sciences, Peking University, Beijing, China.) |
| Abstract | The toxic effects of cadmium (Cd) on the green alga Chlorella vulgaris were investigated by following the response to Cd of various toxicity endpoints (cell growth, cell size, photochemical efficiency of PSII in the light or Φ(PSII), maximal photochemical efficiency or Fv/Fm, chlorophyll a fluorescence, esterase activity, and cell viability). These toxicity endpoints were studied in laboratory batch cultures of C. vulgaris over a long-term 96-h exposure to different Cd concentrations using flow cytometry and pulse amplitude modulated fluorometry. The sequence of sensitivity of these toxicity endpoints was: cell yield >> Φ(PSII) ≈ esterase activity > Fv/Fm > chlorophyll a fluorescence ≈ cell viability. It is shown that cell apoptosis or cell death only accounted for a minor part of the reduction in cell yield even at very high algistatic free Cd²âº concentrations, and other mechanisms such as blocked cell divisions are major contributors to cell yield inhibition. Furthermore, cadmium may affect both the electron donors and acceptors of the electron transport chain at high free Cd²âº concentration. Finally, the resistance of cells to cell death was size-dependent; medium-sized cells had the highest toxicity threshold. The present study brings new insights into the toxicity mechanisms of Cd in C. vulgaris and provides a detailed comparison of the sensitivity of various Cd toxicity endpoints. |
| File Format | HTM / HTML |
| ISSN | 07307268 |
| Issue Number | 12 |
| Volume Number | 32 |
| e-ISSN | 15528618 |
| Journal | Environmental Toxicology and Chemistry |
| Language | English |
| Publisher | Wiley |
| Publisher Date | 2013-12-01 |
| Publisher Place | United States |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Water Pollutants, Chemical Cadmium Chlorophyll Research Support, Non-u.s. Gov't Toxicity Cell Survival Discipline Environmental Health Cytology Fluorescence Discipline Toxicology Esterases Chlorella Vulgaris Metabolism Drug Effects Journal Article Discipline Chemistry Photosynthesis |
| Content Type | Text |
| Resource Type | Article |
| Subject | Environmental Chemistry Health, Toxicology and Mutagenesis |
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