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排序方式: 共有100条查询结果,搜索用时 218 毫秒
31.
Nesrine Gdoura Abdelwaheb Abdelmouleh Khansa Chaabouni Fatma Makni Ayadi Fadhel Guermazi Jean-Claude Murat Abdelfattah Elfeki 《Environmental Chemistry Letters》2011,9(2):273-278
Fish, a widely claimed healthy food for humans, could also pose problems to health due to (1) accumulation of pollutants,
especially heavy metals, (2) presence of marine toxins such as tetrodotoxin, ciguatoxin or okadaic acid and (3) metabolic
production of large amount of uric acid which may crystallize in kidney or in articulations. As tuna fish represents a large
part of the traditional food in some countries, the possible impact of its consumption on public health was investigated,
with special attention to biochemical and histological alterations related to the genital function. For that purpose, white
or red muscle from tuna fish was added for 60 days to the diet of male rats, and attention was paid to biochemical and histological
alterations related to the genital function. Feeding rats with white muscle, and much more markedly with red muscle known
to be more metabolically active, resulted in (1) an elevated uric acid level in blood, (2) an increase in lead level in testis,
(3) an atrophy of the genital tract, including testes, epididymis, prostate and seminal vesicles, (4) a lowering of plasma
testosterone level, (5) a decrease in spermatozoids number and motility, (6) an oxidative stress in testes including an increase
in lipids peroxidation level and enhanced superoxide-dismutase, catalase and glutathione-peroxidase activities. We conclude
that consumption of tuna fish meat, especially the dark one, should be reduced. 相似文献
32.
The fate and effect of continuous feeding of increasing doses of 2,4-dichlorophenol (DCP) were investigated. At the beginning of each run, a drop in the efficiency of the system was recorded, after which a steady state was obtained. Continuous feeding of DCP up to a concentration of 50 mg L?1 reduced BOD5 and COD removal rates by 27% and 29%, respectively. Application of shock doses of DCP showed that adaptation increases the capacity of biological systems for removing toxic chemicals. 相似文献
33.
Interactions of zinc and cadmium toxicity in their effects on growth and in antioxidative systems in tomato plants (Solanum lycopersicum) 总被引:1,自引:0,他引:1
The interaction between zinc and cadmium was investigated in tomato plants (Solanum lycopersicum). Ten-day-old seedlings were treated with 10 μmol/L CDC12 associated to different concentrations of ZnC12 (10, 50, 100, and 150 μmol/L). Zn supply clearly reduced Cd accumulation in leaves and simultaneously increased Zn concentration. Cd induced oxidative stress in leaves as indicated by an increase in thiobarbituric acid-reactive substances (TBARS) level and chlorophyll breakdown. Furthermore, compared with control, Cdtreate plants had significantly higher activities of superoxide dismutase (SOD, EC 1.15.1.1), whereas, catalase (CAT, EC 1.111.1.6),ascorbate peroxidase (APX, EC 1.11.1.11), and glutathione reductase (GR, EC 1.6.4.2) activities were significantly suppressed by Cd addition. Zn supplementation, at low level, restored and enhanced the functional activity of these enzymes (SOD, CAT, APX and GR) as compared to Cd-alone-treated plants. The beneficial effect of adequate Zn level on Cd toxicity was confirmed by a significant decrease in TBARS level and restoration of chlorophyll content. However, when Zn was added at high level in combination with Cd there was an accumulation of oxidative stress, which was higher than that for Cd or excess Zn alone treatments. These results suggested that higher Zn concentrations and Cd are synergistic in their effect on plant growth parameters and oxidative stress. 相似文献
34.
Abukhadra Mostafa R. Dardir Fatma M. Shaban Mohamed Ahmed Ezzat A. Soliman Mamdouh F. 《Environmental Chemistry Letters》2018,16(2):665-670
Environmental Chemistry Letters - Biodiesel produced from animal and plant fat oils is sustainable, but there is a need for efficient heterogeneous catalysts for transesterification of crude oils... 相似文献
35.
Interactions of zinc and cadmium toxicity in their effects on growth and in antioxidative systems in tomato plants (Solanum lycopersicum) 总被引:2,自引:0,他引:2
The interaction between zinc and cadmium was investigated in tomato plants (Solanum lycopersicum). Ten-day-old seedlings were
treated with 10 mol/L CdCl2 associated to di erent concentrations of ZnCl2 (10, 50, 100, and 150 mol/L). Zn supply clearly reduced
Cd accumulation in leaves and simultaneously increased Zn concentration. Cd induced oxidative stress in leaves as indicated by an
increase in thiobarbituric acid-reactive substances (TBARS) level and chlorophyll breakdown. Furthermore, compared with control, Cdtreated
plants had significantly higher activities of superoxide dismutase (SOD, EC 1.15.1.1), whereas, catalase (CAT, EC 1.111.1.6),
ascorbate peroxidase (APX, EC 1.11.1.11), and glutathione reductase (GR, EC 1.6.4.2) activities were significantly suppressed by Cd
addition. Zn supplementation, at low level, restored and enhanced the functional activity of these enzymes (SOD, CAT, APX and GR) as
compared to Cd-alone-treated plants. The beneficial e ect of adequate Zn level on Cd toxicity was confirmed by a significant decrease
in TBARS level and restoration of chlorophyll content. However, when Zn was added at high level in combination with Cd there was an
accumulation of oxidative stress, which was higher than that for Cd or excess Zn alone treatments. These results suggested that higher
Zn concentrations and Cd are synergistic in their e ect on plant growth parameters and oxidative stress. 相似文献
36.
Methneni Nosra Anthonissen Roel Van de Maele Jolien Trifa Fatma Verschaeve Luc Mansour Hedi Ben Mertens Birgit 《Environmental science and pollution research international》2020,27(32):40088-40100
Environmental Science and Pollution Research - Due to the complexity and variability of textile wastewater composition, a constant search for new treatment strategies that are efficient,... 相似文献
37.
Khalid Habib Ningthoujam Manikar Sabbir Ansari Tasneem Fatma 《Environmental science and pollution research international》2013,20(2):862-871
Cyanobacterial biofertilizers are affected by paddy field pesticides as nontarget organism. Carbaryl is a carbamate pesticide and is commonly used against rice thrip pest in paddy fields. In the present work, cellular changes caused by exposure of the cyanobacterial biofertilizer namely Calothrix brevissima to carbaryl were studied with special reference to fatty acids, electrolyte leakage, sulfur metabolism, and osmolytes. To study the toxic effect of carbaryl, the test cyanobacterium was exposed to varying concentrations of pesticide (0, 10, 20, 30, and 40 mg L?1) for biochemical analyses. At 40 mg L?1 carbaryl, polyunsaturated fatty acids were reduced by 32 % and membrane leakage was increased by 27 % suggesting that free radical-mediated lipid peroxidation took place. The sulfur-containing metabolites namely cysteine, cystine, and methionine were increased by 79, 64, and 52 %, respectively. The enzymatic and nonenzymatic antioxidants namely glutathione S-transferase, glutathione reductase, reduced glutathione, and oxidized glutathione were increased to 56, 71, 72, and 60 %, respectively. Osmolytes that serve as stress enzyme protectors as well as nonenzymatic free radical scavenger were also increased, indicating their protective nature in context with carbaryl-induced stress. The respective increase in mannitol, trehalose, and glycogen were 158, 98, and 159 %. In C. brevissima, carbaryl-induced membrane leakage was counteracted by increasing enzymatic and nonenzymatic parameters that helped in scavenging free radicals. 相似文献
38.
Rumana Tasmin Yohei Shimasaki Michito Tsuyama Xuchun Qiu Fatma Khalil Nozomu Okino Naotaka Yamada Shinji Fukuda Ik-Joon Kang Yuji Oshima 《Environmental science and pollution research international》2014,21(2):1064-1070
In the actual environment, temperatures fluctuate drastically through season or global warming and are thought to affects risk of pollutants for aquatic biota; however, there is no report about the effect of water temperature on toxicity of widely used herbicide diuron to fresh water microalgae. The present research investigated inhibitory effect of diuron on growth and photosynthetic activity of a green alga Pseudokirchneriella subcapitata at five different temperatures (10, 15, 20, 25, and 30 °C) for 144 h of exposure. As a result, effective diuron concentrations at which a 50 % decrease in algal growth occurred was increased with increasing water temperature ranging from 9.2 to 20.1 μg L–1 for 72 h and 9.4–28.5 μg L–1 for 144 h. The photochemical efficiency of photosystem II (F v/F m ratio) was significantly reduced at all temperatures by diuron exposure at 32 μg L–1 after 72 h. Inhibition rates was significantly increased with decreased water temperature (P?<?0.01). Intracellular H2O2 levels as an indicator of oxidative stress were also decreased with increasing temperature in both control and diuron treatment groups and were about 2.5 times higher in diuron treatment groups than that of controls (P?<?0.01). Our results suggest water temperatures may affect the toxicokinetics of diuron in freshwater and should therefore be considered in environmental risk assessment. 相似文献
39.
Fatma Sahindokuyucu Kocasari Firdevs Mor Mustafa Numan Oguz Fatma Karakas Oguz 《Environmental monitoring and assessment》2013,185(6):4943-4949
The aim of this study was to evaluate the incidence of total aflatoxin (AF), ochratoxin A, T-2 toxin, deoxynivalenol (DON), zearalenone (ZEA), and fumonisin (FB) in dairy cattle, beef cattle, and lamb–calf feeds. A total of 180 dairy cattle, beef cattle, and lamb–calf feeds (60 samples each) were randomly collected from farms, feed mills, and villages in Burdur province, between September 2006 and August 2007. All samples were analyzed by the competitive Enzyme Linked Immuno Sorbent Assay (ELISA). The most frequent mycotoxin detected was total AF, which was found in 108 samples (60 %) in concentrations ranging from 3.82 to 116.83 μg?kg?1, followed by DON that was detected in 87 samples (48.3 %), in concentrations ranging from 18.50 to 500 μg?kg?1. Ochratoxin A (OTA), T-2 toxin, ZEA, and FB were found in 84 (46.7 %), 85 (47.2 %), 57 (31.7 %), and 19 (10.6 %) samples, respectively, in concentrations of 1.01 to 15.85 μg?kg?1 for OTA, 3.85 to 52.36 μg?kg?1 for T-2 toxin, 2.10 to 29.30 μg?kg?1 for ZEA, and 2.69 to 4.96 mg?kg?1 for FB. It was concluded that feed samples in Burdur province were contaminated by mycotoxins, and the levels of total aflatoxin in the samples were considered a risk to animal health. 相似文献
40.
The distribution of fecal coliforms was investigated and determined in Izmir Bay from 1996 to 2005. Izmir Bay severely was polluted from industrial and domestic discharges during decades. In early 2000, a wastewater treatment plant began to treat domestic and industrial wastes. This plant treats the wastes about 80% capacity after 2001. The sampling periods cover before and after treatment plant. Assessment method for determining the number of fecal coliform has evolved membrane filtrations. Maximum surface fecal coliform concentration was 4.9 × 105 cfu 100 ml???1 in 1996–2000 period. Following the opening treatment system, fecal coliform density decreased 2.1 × 104 cfu 100 ml???1 during 2001–2005. A continuous improvement can be sustained in the water quality if direct inflow of untreated wastewater is prevented. 相似文献