Optic neuropathy and retinopathy in closantel toxicosis of sheep and goats     

PA GILL  RW COOK  JG BOULTON  WR KELLY  B VANSELOW  LA REDDACLIFF 《Australian veterinary journal》1999,77(4):259-261

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增产菌对高寒地区燕麦产草量的增产效应     

邹华  贾德志 《草业科学》1999,16(4):14-16

采用增产菌拌种,喷施２种方法的二因素随机区组设计,对燕麦草的增产效应进行了研究,研究结果,增产菌对燕麦的增产效果显著（Ｐ〈０．０１）,最佳拌种量３００ｇ／ｈｍ＾２,最佳喷施量为３００ｋｇ／ｈｍ＾２拌种和喷施增产菌对燕麦的增产效果是相互独立的,拌种与喷施的交互作用不显著（Ｐ〉０．０５）,两者的增产效应是可加效应,最佳处理组合为３００ｇ／ｈｍ＾２拌种量＋３００ｇ／ｈｍ＾２喷施量。  相似文献   

人工模拟飞播牧草对治理“黑土滩”型退化草地的效果调查   总被引：4，自引：1，他引：3  

拉元林  梁珠英 《青海草业》2000,(4)

采用路线定点抽样方法 ,对人工模拟飞播治理“黑土滩”进行了调查 ,结果表明 ,飞播后平均每公顷鲜草产量 991 2 .6kg,比播前提高了 1 1 .5 5倍 ;植被盖度达 70 %～ 80 % ;草群结构改变 ,一些已消失了的优良牧草相继出现 ,不食毒杂草大幅度下降 ,治理效果良好。  相似文献   

基于地统计学和GIS的喀斯特烟田土壤肥力综合评价——以贵州省毕节地区为例   总被引：1，自引：1，他引：1  

腊贵晓  刘国顺  曹杰  李祖良  翟欣 《河南农业科学》2012,41(4):63-68

以贵州省典型的喀斯特地区———毕节地区为研究区域,利用地统计学和GIS相结合的方法,对烟田土壤肥力进行综合评价。在确定评价因子隶属函数和权重的基础上,建立土壤肥力综合评价指标(IFI)。通过对土壤肥力综合评价指标进行半方差函数分析和普通克里格法(Kriging)最优内插,绘制了毕节地区烟田土壤肥力综合评价指标的空间分布图。描述性统计结果表明,毕节地区烟田土壤肥力综合评价指标值为0.35～0.92,变异系数为14.25%。半方差函数分析表明,毕节地区烟田土壤肥力综合评价指数的最适模型是指数模型;块基比为30%,表明具有中度空间相关性;烟田土壤肥力综合评价指数在空间分布上总体呈从内到外递减的趋势,其中以0.63～0.72和0.72～0.92范围内的面积较大,分别占到总面积的68.20%和20.63%。由此表明,该研究区域大部分土壤肥力状况良好。  相似文献   

Effect of feeding frequency and feeding time on growth of Penaeus vannamei (Boone)   总被引：2，自引：0，他引：2  

L. ROBERTSON  A. L. LA WRENCE  F. L. CASTILLE 《Aquaculture Research》1993,24(1):1-6

Abstract. An intensive growth trial conducted In pens in an earthen pond indicated that growth of Penaeus vannamei (Boone) increased with feeding frequency and suggested that day feedings produce greater growth than night feedings. The differences in growth due to feeding frequency were significant, instantaneous growth rates (IGR) increasing from 1·62% to 1·66% to 1·71%/day as the number of feedings increased from one to two to four per 24 h. Comparison of the IGR of shrimp fed at night (1·64%/day) to that of shrimp fed during the day (1·68%/day) suggested ( P = 0·0633) that growth was greater for shrimp given day feedings than for shrimp given night feedings. Survival of shrimp was not significantly different due to feeding frequency or due to time of feeding and averaged 74·7 ± 6·1%. Results indicate that P. vannamei cultured under conditions similar to those tested should be fed a minimum of four times daily and suggest that feeding during the day is at least as good as and may be preferable to feeding at night.  相似文献   

放线菌Act1对连作西瓜枯萎病的防治效果   总被引：1，自引：0，他引：1  

李欢  刘建辉  冯宁宁  薛泉宏 《北方园艺》2012,(15):144-147

为了探索放线菌制剂Act1对连作西瓜枯萎病的防治效果及其对西瓜根际微生物含量的影响,采用大棚小区田间试验,以不接种放线菌制剂Act1为对照,以播种期接种和定植期接种为处理,研究不同处理对西瓜生长、枯萎病发生及其根域微生态的影响。结果表明:接种放线菌制剂的处理均能显著降低连作西瓜枯萎病的发生率,其中育苗期接种防效最显著,达到52.17%;育苗期接种放线菌制剂Act1显著促进了植株的生长;并增加了西瓜根区细菌和放线菌的数量,降低了真菌的数量且A/F、A/B、B/F与对照相比分别增加了1.38～5.5、1.53～5.25、1.29～1.75倍。接种放线菌制剂Act1的处理均能显著防治连作西瓜枯萎病的发生并改善根际微生物的组成。  相似文献   

不同季节牧草钙磷含量对放牧绵羊血清骨钙素的影响     

魏炳栋  张力  周学辉  苗小林  喇红青  张庆和  晁生玉  张炳玉 《甘肃农业大学学报》2005,40(4):452-456

研究了不同季节牧草钙磷含量对放牧绵羊血清骨钙素、碱性磷酸酶、血清钙、无机磷、血清钙磷比和血清钙磷乘积的影响。结果表明:这些血清指标随季节变化明显,血清骨钙素夏季含量为(2.009±0.888)ng/mL,极显著的低于冬春季(3.974±1.281)ng/mL和秋季(3.279±1.365)ng/mL的含量(P<0.05)。从相关分析中看出,骨钙素与AKP、血钙、无机磷、血钙/磷和血钙磷乘积呈正相关,相关系数分别为0.047、0.546、0.035、0.394、0.489。与牧草钙、磷和钙磷比呈负相关,尤其与牧草钙的相关系数达-0.657(P<0.01)。利用逐步回归的方法得出的骨钙素与牧草钙、血清钙的多元回归方程为:骨钙素=1.813-2.358牧草钙+0.945血清钙(P<0.05)。认为血清骨钙素可以作为反映放牧绵羊钙磷盈缺状况的灵敏指标。  相似文献   

Mechanical wounding induces the formation of extensive coated membranes in giant algal cells     

O'neil RM  LA Claire JW 《Science (New York, N.Y.)》1984,225(4659):331-333

Mechanically wounding giant cells of Boergesenia forbesii induces the formation of bristle-coated, plasma-membrane invaginations (coated pits) and coated vesicles, easily providing a plentiful source of coated membranes in a clean cellular system unencumbered by other tissues. Contractions evoked by wounding partition the cytoplasm into hundreds of spherical protoplasts with approximately 40 percent less total plasma-membrane surface area than the original cell. Ferritin labeling and the appearance of numerous large coated pits and vesicles at the peak period of contraction indicate that these organelles play a role in extensive endocytosis of the plasma membrane.  相似文献   

Functional and Rheological Properties of Amaranth Albumins Extracted From Two Mexican Varieties     

Silva-Sánchez C  González-Castañeda J  de León-Rodríguez A  Barba de la Rosa AP 《Plant foods for human nutrition (Dordrecht, Netherlands)》2004,59(4):169-174

The functional and rheological properties of amaranth albumins isolates extracted from two new Mexican varieties were determined. Functional properties tested were protein solubility, foaming, water and oil absorption capacities, emulsifying activity, and emulsion stability. The maximum solubility values for both amaranth albumins were found above pH 6 and values were compared to the solubility of egg albumins. Albumins from amaranth showed excellent foaming capacity and foaming stability at pH 5, suggesting that this protein could be used as whipping agents as egg albumins, also the water and oil absorption capacities reached their maximum values at acidic pH, suggesting that amaranth albumins could be appropriate in preparation of acidic foods. The rheological test based on farinograms and alveograms showed that wheat flour supplemented with 1% amaranth albumins improves the dough properties due to higher mixing stability and the bread had better crumb characteristics. In addition of the known high nutritional values of amaranth albumins, our results indicate the high potential for use of these proteins as an ingredient in food preparations.  相似文献   

葡萄卷叶病毒外壳蛋白基因的克隆、序列分析及其在大肠杆菌中的表达   总被引：1，自引：0，他引：1  

张玉满  李云  腊平 《植物病理学报》2000,30(3):232-236

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