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A 21-day laboratory incubation experiment was conducted to investigate the impact of pesticides (insecticide, herbicide, fungicide)
on paddy field soil health under controlled moisture (flooded soil) and temperature (25°C) environment. The electron transport
system (ETS)/Dehydrogenase activity showed negative correlation with pesticides concentrations, decreased with increase of
pesticide concentration. The higher doses (5 to 10 times field rates) of pesticides significantly inhibited ETS activity,
while lower rates failed to produce any significant reducing effect on the control. The toxicity of pesticides in decreasing
the ETS activity was in the order: insecticide > fungicide > herbicide, irrespective of their rates of application. The pesticides
increased the soil phenol content, which increased with increasing concentration of agrochemicals. The pesticide application
did not produce any significant change in soil protein content. The response of biomass phospholipid content was nearly similar
to that of ETS activity. The phospholipid content decreased with the addition of pesticides in the order insecticide > fungicide
> herbicide and the toxicity was in the order: 10 FR (field rate) > 5 FR > 1.0 FR > 0.5 FR > control.
Project (No. G1999011809) supported by the National Key Basic Research Foundation (973) of China
Ph. D. student at Zhejiang University, from Ministry of Agriculture (Punjab), Government of Pakistan 相似文献
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Ramesh Chandra Manisha Tiwari Ritu Aneja Sujata K. Dass Archana Sharma 《Indian journal of clinical biochemistry : IJCB》2000,15(2):148-154
We investigated the effect of cholesterol and the metalloporphyrins cobalt mesoporphyrin (CoMP) and chromium protoporphyrin
(CrPP) on phospholipase A2 (PLA2) activity and the consequent hepatic mitochondrial stability as well as on lipid concentrations. Our studies revealed that
on administration of cholesterol, CrPP, CoMP as well as simultaneous adminstration of cholesterol and CrPP, there was an inhibition
of PLA2 activity. These moieties may therefore, be agents for preventing destabilisation of the mitochondrial membrane and the consequent
pathological conditions which may arise due to membrane lysis. Our results revealed that cholesterol administration increased
phospholipid concentration, albeit by modest amounts. Although the independent administration of metalloporphyrins led only
to minor elevations in phospholipid concentration, the simultaneous administration of cholesterol and CrPP generated a steep
elevation in the concentration of total phospholipid. Since cholesterol inhibits PLA2 activity it has the potential of being therapeutic agent for preventing the pathological conditions which may arise due to
membrane lysis. 相似文献
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观察了烟雾吸入后大鼠细胞内、外肺表面活性物质（ＰＳ）含量的变化及可能机理．分别检测了正常对照及烟雾致伤大鼠伤后２、６、１２和２４ｈ的动脉血气、肺水量、血浆内皮素－１（ＥＴ－１）含量、支气管肺泡灌洗液（ＢＡＬＦ）和肺匀浆总磷脂（ＴＰＬ）含量、肺组织内板层体（ＬＢ）表达及肺泡Ⅱ型上皮细胞内ＬＢ平均数等．结果发现：动物伤后出现急性呼吸衰竭和严重肺水肿;血浆ＥＴ－１和ＢＡＬＦ中ＴＰＬ进行性升高,二者相关显著;肺组织和全肺ＴＰＬ显著降低,ＬＢ表达及ＬＢ平均数明显减少,且与肺组织ＴＰＬ的变化明显相关．提示烟雾吸入伤早期肺泡腔中细胞外ＰＳ增加,ＥＴ－１在介导ＰＳ持续分泌中可能有重要作用;细胞内及全肺ＰＳ减少,除分泌亢进外,可能还有合成障碍和（或）降解增加 相似文献
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Ranjana Singh Sumita Sharma Raj K. Singh Germaine Cornelissen 《Indian journal of clinical biochemistry : IJCB》2016,31(2):215-223
The circadian rhythm of human circulating lipid components was studied under nearnormal tropical conditions in 162 healthy volunteers (103 males and 59 females; 7 to 75 years of age). They followed a diurnal activity from about 06:00 to about 22:00 and nocturnal rest. These volunteers were divided into four groups: Group A (7–20 years), Group B (21–40 years), Group C (41–60 years) and Group D (61–75 years), comprising 42, 60, 35 and 25 participants, respectively. A marked circadian rhythm was demonstrated for each studied variable in each group by population-mean cosinor analysis (almost invariably p < 0.001). Furthermore, circadian rhythm characteristics were compared among the 4 groups by parameter tests and regressed as a function of age, separately for males and females. A second-order polynomial characterized the MESOR of HDL cholesterol, phospholipids and total lipids, as well as the 24-h amplitude of total cholesterol and phospholipids. The 24-h amplitude of total lipids decreased linearly with age. The 24-h acrophase of the oldest age group (Group D) was advanced in the case of total cholesterol, HDL cholesterol, and total lipids, whereas that of phospholipids was delayed. Mapping the circadian rhythm (an important component of the broader time structure or chronome, which includes a. o., trends with age and extra-circadian components) of lipid components is needed to explore their role in the aging process in health. 相似文献
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