کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8850610 | 1618762 | 2018 | 37 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Phytotoxic activity of diclofenac: Evaluation using a model green alga Chlamydomonas reinhardtii with atrazine as a reference substance
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کلمات کلیدی
COX-1Ψ0TR0/RCMDAOJIPFv/F0ET0/RCDI0/RCPS IIHSMCECsEQSEC50OECAPXCOX-2CATRCMNSAIDABS/RC - ABS / RCDMSO - DMSOPS I - PS منROS - ROSatrazine - آترازینContaminants of Emerging Concern - آلاینده های ناگهانیEuropean Union - اتحادیه اروپاOxygen evolving complex - اکسیژن تکامل یافته پیچیده استOxidative stress - تنش اکسیداتیوNon-steroidal anti-inflammatory drugs - داروهای ضد التهابی غیر استروئیدیDiclofenac - دیکلوفناکDimethylsulfoxide - دیمتیل سولفواکسیدcyclooxygenase 1 - سیکلوکوکسیژناز 1cyclooxygenase 2 - سیکلوکوکسیژناز 2Performance índex - عملکرد شاخصphotosystem I - عکس سیستم منPhotosystem II - فتوسیستم 2Phytotoxicity - فیتوتوکسیتیک malondialdehyde - مالون دی آلدهیدreaction center - مرکز واکنشhalf maximal effective concentration - نیمه حداکثر غلظت موثرascorbate peroxidase - پراکسیداز آسکورباتیCatalase - کاتالازChlamydomonas - کلامیدوموناسReactive oxygen species - گونههای فعال اکسیژن
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم محیط زیست
شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Human activities have caused increasing inputs of pharmaceuticals to the environment and diclofenac (DF) is one of the most commonly detected in freshwater systems. The aim of this study was to determine the impact of DF on a freshwater green alga as a non-target organism. For DF toxicity evaluation, its effects on a model organism Chlamydomonas reinhardtii were compared with effects caused by the herbicide atrazine (AT). EC50 values were about 135â¯mg/L for DF and 78â¯mg/L for AT, respectively. Both toxicants enhanced H2O2 production by the cells (144% and 178% of control for AT and DF, respectively) and stimulated catalase activity (â200% of control). Activity of ascorbate peroxidase was elevated in AT-cells but not in DF-treated cells. DF did not influence dark respiration of the cells, whereas AT inhibited this process by about 50% compared to the control. Both toxicants caused photosynthesis inhibition. Analysis of parameters of chlorophyll a fluorescence in vivo showed diminishment of a performance index (PI) in both DF- and AT-treated cells (â50% of control), but the reasons for the changes detected were different. AT diminished the efficiency of electron transport between PS II and PS I without significant inhibition of PS II or PS I reaction centers (RCs). In contrast to AT, DF seemed to influence directly PS II RCs. The fraction of active PS II RCs was lowered in DF-treated cells, but energy flux per active RC increased. Our study indicates that DF phytotoxicity results mainly from photosynthesis inhibition due to “silencing” of a fraction of PS II RCs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 209, October 2018, Pages 989-997
Journal: Chemosphere - Volume 209, October 2018, Pages 989-997
نویسندگان
Monika Majewska, Darya Harshkova, Monika GuÅciora, Anna Aksmann,