花粉多糖注射剂质量标准中几个项目测定

根据中国药典对注射剂的要求,对花粉多糖的蛋白质、鞣质、树脂、草酸盐、炽灼残渣、钾离子、砷盐、重金属含量进行测定,均符合规定,达到质量标准。     

辽宁省水产品中孔雀石绿含量的现状

孔雀石绿(Malachite green),别名碱性绿、盐基块绿、孔雀绿,生物染色剂、染料,商品名有草酸盐和氯化锌两种规格,以前渔业上用的常为前者.     

犬膀胱结石的手术治疗

膀胱结石是犬尿结石中最为常见的一种,指在膀胱中存在无机或有机盐类结晶的凝结物,可刺激膀胱黏膜引起出血、炎症等。本病多见于老     

常见兔饲料中的有毒成分

１胰蛋白酶抑制因子这类物质在生化结构上是由氨基酸残基组成的多肽，它们在胃内不被破坏，进入小肠后与胰蛋白酶结合形成复合物，使胰蛋白酶失去活性。这种复合物在小肠中不会被分解，进入大肠后可被微生物降解，或者经粪便排出体外。因此，胰蛋白酶抑制因子不仅阻碍蛋白质消化，而且会使兔体丧失部分蛋白质（胰蛋白酶本身是一种必需氨基酸含量较高的兔体蛋白）。在家兔的常用饲料中，大豆的胰蛋白酶抑制因子含量特别高（可达１０．７μg／g）。因此，家兔长时间饲喂生大豆可发生胰腺代偿性肿大和蛋白质消化不良现象，以生长兔最为明显，成…     

寒冬喂牛抓七点

1、切短水洗 将整条的粗饲料切短为8～10cm，减少牛因咀嚼粗料的能量消耗，从而增加牛的热能储备和休息时间。粗料（特别是稻草）中草酸盐和硅的含量较高，是导致牛发生尿道结石的主要因素，因此，粗料在喂牛前应进行水洗，降低粗料中草酸盐和硅的含量，从而降低牛尿的酸碱度。     

常见兔饲料中的有毒成分

在一些家兔常用饲料中不同程度地含有某些有毒成分.这些物质,有的阻碍营养物质的消化和吸收,有的则干扰兔体的正常代谢.饲料毒物的毒性不仅取决于本身毒力,则且很大程度上还取决于它在饲料中的含量.当饲料含毒物质低于中毒临界水平时可安全饲用,不会引起不良后果;相反,高于临界水平的则会危害家兔的健康,甚至可造成中毒和死亡.因此,了解饲料有毒成分的性质和含量是很重要的.     

草酸检测方法的研究进展

简要介绍国内外各种介质中的草酸及其盐类的检测方法,并对其进行了比较,对酶法检测进行了专门的分析报道,对各种方法的应用前景进行了展望。     

建昌马肾脏疾病与草酸盐中毒症

肾病是一种变质性肾损伤,主要特征是皮质部肾小管细胞混浊肿胀、脂肪变性和坏死,肾脏常常肿大,切面外翻.由于肾小球通透性增大或肾小管细胞浆外溢,在肾小管中形成透明管型[1].     

Bio—Mobilization of Potassium from Clay Minerals：II.By ectmycorrhizal Fungi

Ectomycorrhizal ungi,including Cenococcum geophilum SIV( Cg SIV),and Pisolithus tinctorius 2144(Pt 2144),441(Pt 441) and XC1(Pt XC1),were cultured in Pachlewski liquid medium with H2KPO4,KCl-saturated vermiculite and mica as K sources,respectively,to investigate the mechanism of K absorption and mobilization by the fungi,FUngal growth rate,K absoprtion and mobilization varied significantly among the fungal species,Faster growth and greater K accumulation in Pt XC1 than Pt 2144,Pt 441 and Cg siv were observed.Ectomycorrhizal fungi depressed HCl-soluble K in minerals after successive extractions by water and NH4OAc.Ratio of the total amount of K,including water-,NH4OAc-and HCl-soluble K,lost from substrates to the K accumulated in fungal colonies was less than 60%.These reveal that the ectomycorrhizal fungi could utilize K in Interlayer and structural pools,which are usually unavailable for plants in short period.Large differences in the depletion of K in interlayer and structural pools by fungi were observed at fungal harvest.Taking into account the nutrient absorption by ectomycorrhizal fungi in symbionts and the direct contact between hyphae and soils,the fungi species colonized on the root surfaces seemed to be related to the effectiveness of mycorrhizas to utilize K in soils.Ectomycorrhizal fungi differed in the efflux of protons and oxalate.Pt XC1 was observed to have greatest ability to effuse protons and oxalate among the fungi adopted in the experiment.Furthermore,the higther the concentrations of protons and oxalate in the liquid culture solutions,the larger the depletion of K in interlayer and structural pools in minerals by fungi,Protons could replace interlayer K and chelation of oxalate with Fe and Al in crystal lattice could cause weathering of clay minerals.So,protons and oxalate produced by ectomycorrhizal fungi might play an important role in K mobilization in these two pools.     

黄河三角洲耕地变化及其驱动力的卫星遥感分析

Taking Kenli County in the Yellow River Delta, China, as the study area and using digital satellite remote sensing techniques, cultivated land use changes and their corresponding driving forces were explored in this study. An interactive interpretation and a manual modification procedure were carried out to acquire cultivated land information. An overlay method based on classification results and a visual change detection method which was supported by land use maps were employed to detect the cultivated land changes. Based on the changes that were revealed and a spatial analysis between cultivated land use and related natural and socio-economic factors, the driving forces for cultivated land use changes in the study area were determined. The results showed a decrease in cultivated land in Kenli County of 5321.8 ha from 1987 to 1998, i.e., an average annual decrement of 483.8 ha, which occurred mainly in the central paddy field region and the northeast dry land region. Adverse human activities, soil salinization and water deficiencies were the driving forces that caused these cultivated land use changes.