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The Estimation of Soil Trace Elements Distribution and Soil-Plant-Animal Continuum in Relation to Trace Elements Status of Sheep in Huangcheng Area of Qilian Mountain Grassland,China 下载免费PDF全文
WANG Hui LIU Yong-ming QI Zhi-ming WANG Sheng-yi LIU Shi-xiang LI Xia WANG Hai-jun WANG Xiao-li XIA Xin-chao ZHU Xin-qiang 《农业科学学报》2014,13(1):140-147
The purpose of the present study was to survey contents of trace elements of Cu, Mn, Fe, and Zn in the surface layer (0-20 cm) in the soil, pasture and serum of sheep in Huangcheng area of Qilian mountain grassland, China. Also the soil-plant-animal continuum was analyzed. Soil (n=300), pasture (n=60), and blood serum samples from sheep (n=480) were collected from Huangcheng area of Qilian mountain grassland, China. The contents of trace element in the samples were analyzed by atomic absorption spectrophotometer after digestion. The soil trace elements density distribution shows a ladder-like pattern distribution. Equations developed in the present study for prediction of Fe (R2=0.943) and Zn (R2=0.882) had significant R2 values. 相似文献
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为了研究六茜素注射液的安全性,进行了六茜素注射液的亚慢性毒性试验。试验每天给大白鼠灌服六茜素注射液80、160、320 mg/kg,对各组大白鼠的体重变化、脏器系数、血液生理生化指标及心脏、肝脏、脾脏、肾脏、胸腺等脏器病理变化进行了测定和分析。结果表明,试验组大白鼠的各脏器无明显肉眼可见剖检病变;试验组大白鼠的各脏器系数与对照组差异不显著(P>0.05);320 mg/kg剂量组大白鼠的肝脏和肾脏器官出现轻微的病理变化。结果说明,六茜素注射液毒性低,可以安全用于动物。 相似文献
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为了评价常山提取物的安全性,对其进行了小白鼠的急性毒性试验。预试验初步确定用药剂量,正式试验取60只昆明种小白鼠,灌胃给药后,连续观察7 d,记录小白鼠的急性毒性反应,并通过改良寇氏法计算常山提取物对小白鼠的半数致死量(LD50)及LD50的95%可信限。结果表明,给药组部分小白鼠出现中毒反应并死亡,剖检主要脏器未见病理变化,测得LD50为18.16 g/kg体重,LD50的95%可信限为15.35~21.49 g/kg体重。试验结果初步提示,常山提取物的毒性很低,临床用药安全可靠。 相似文献