共查询到20条相似文献，搜索用时 31 毫秒
1.
2.
镉中毒解毒机理的研究：硒化合物的预防和治疗作用初探 总被引：4，自引：0，他引：4
对大鼠组织胞液(Cytosol)的体外试验结果表明:亚硒酸钠、硒酸钠及硒化钠以明显影响[~(109)Cd]标记的氯化镉在组织胞液中的分布。硒酸钠、亚硒酸钠有较强的封闭金属硫蛋白(MT)与镉结合部位、激活分子量较大的蛋白质,捕获胞液中[~(109)Cd]的作用,还可使已经和MT结合的[~(109)Cd]被剥离,随后,[~(109)Cd]转入分子量较大的蛋白质上;亚硒酸钠还可使[~(109)Cd]转入分子量为32000～35000的蛋白质上。硒化钠仅有较弱的剥离与MT结合的镉,使之转入分子量较大的蛋白质上,但几乎不能阻止镉与MT结合。镉与大、中分子量蛋白质结合力远较它与MT的结合力弱,因而以能有利于镉被排出体外。 相似文献
3.
为研究ｒ－球蛋白制剂对雏鸡法氏囊发育的影响，１４０羽２日龄ＡＡ肉鸡被随机等分为两组。试验组鸡分别在１、２和３周龄期注射血清ｒ－球蛋白，１０ｍｇ／羽。对照组不予注射。然后用透时电镜（ＴＥＭ）观察两组鸡法氏囊的形态结构。结果表明：试验组与对照组相比，２周龄期，法氏囊淋巴滤泡内淋巴细胞数量增加，核内常染色质、胞质内线粒体、溶酶体和糙面内质网均增加。３周龄期，中淋巴细胞比例增加、淋巴细胞分裂较快。４周龄期，淋巴滤泡内“冠区”结构明显，ＩＳＥ分泌功能活跃。提示ｒ－球蛋白制剂可能对雏鸡法氏囊发育和淋巴细胞的增殖与分化有促进作用。本文还对ｒ－球蛋白制剂增强幼禽抗病能力的作用机理进行了探讨。 相似文献
4.
5.
溴氰菊酯对微小牛蜱的敏感度和对雌蜱产卵的影响的研究 总被引：7，自引：0，他引：7
１９９１～１９９２年在福建省研究溴氰菊酯对微小牛蜱各变态期的敏感度和对饱血雌蜱产卵情况的影响。结果表明，幼蜱对溴氰菊酯最敏感，当施用浓度为５ｐｐｍ时，幼蜱平均死亡率为１００％；若蜱其次，死亡率２８．９％；未吸虫成蜱敏感度最低，死亡率仅１０％。据Ｘ２检验，微小牛蜱在不同变态期间对溴氰菊酯的敏感度差异极显著（Ｐ＜０．０１）。饱血雌蜱接触溴氰菊酯１０μｇ／虫后，其产卵前期比对照蜱延长６天，产卵期缩短６天，产卵量减少２１８８粒。 相似文献
6.
7.
8.
9.
通过对河南县高寒草句退化草地封育3年试验表明：轻度退化草地封育3年后的总盖度从78％提高到98％,增加了20个百分点,优良牧草产量增加52．8％,毒杂草产量减少33．1％;中度退化草地封育3年后总盖度从55％提高到79％,增加了24个百分点,优良牧草产量增加96．1％,毒杂草产量减少29．4％;重度退化草地封育3年后总... 相似文献
10.
Everett Aronson DVM Karl H. Kraus DVM Julif Smith DVM 《Veterinary radiology & ultrasound》1991,32(1):2-5
The effect of anesthesia on the radiographic appearance of the coxofemoral joints was evaluated by taking pelvic radiographs of thirty dogs. Each dog was radiographed twice, once under general anesthesia and once without anesthesia. The radiographs were submitted to the Orthopedic Foundation for Animals independently of one another to be evaluated for signs of hip dysplasia. Results suggest there was no statistical difference between the two groups of dogs. Twenty five dogs received the same reading. Three dogs received readings that were worse by one grade while under anesthesia and two dogs received readings that were one grade better while under anesthesia. This study failed to demonstrate any changes due to anesthesia on the radiographic appearance of the coxofemoral joints. Anesthesia may, however, be beneficial for proper positioning and to decrease unnecessary patient, and personnel exposure to radiation. 相似文献
11.
12.
13.
14.
EFFECT OF DISRUPTION OF THE SEBACEOUS LAYER OF THE SHEEP''S SKIN ON THE INCIDENCE OF FLEECE-ROT 总被引：1，自引：0，他引：1
It was postulated that integrity of the sebaceous layer on the skin is important in maintaining resistance to fleece-rot. This hypothesis was tested in an experimenta of a 2 x 2 factorial design in which sebaceous layer disruption and wetting were the 2 treatments. The sebaceous layer was disrupted by applying a light petroleum solvent to the skin of the sheep. Fleece-rot occurred in all sheep (20) that were both wetted and had the sebaceous layer disrupted while 9/19 of those wetted but without the sebaceous layer disrupted developed fleece-rot. The fleece-rot lesions observed were more severe in sheep in the disrupted wetted treatments than in the intact wetted treatment. Interpretation of these differences was complicated by a possible reaction of the skin to the solvent used. The differences were not due to an effect of treatment on fleece wettability. No fleece-rot developed in the sheep not wetted and application of the solvent alone did not induce fleece-rot. 相似文献
15.
16.
17.
18.
19.
C型肉毒梭菌毒素毒饵在天然草地上放置6天内,试鼠高原鼠兔死亡率为90～100％;8～10天逐渐分解为基本无毒。试鼠死亡高峰期为采食毒饵后3～4天,并且5天内已接触过毒素的试鼠不产生明显的耐药性。 相似文献
20.
在回-直肠吻合猪日粮中添加可溶性糖对养分消化率的影响 总被引：4，自引：0，他引：4
为探明回－直肠吻合荷术猪日粮中补加可溶性糖的得失利弊，本文采用4头术后14周的回－直肠吻合猪，研究了在日粮中补加可溶性糖对养分消化率测值的影响，结果为：（1）在试验日粮中添加可溶性糖对于干物质的表观消化率有提高的趋势，但本试验条件差异不显著（P＞0．05）；（2）日粮中添加可溶性糖对氮的消化率和代谢率没有影响（P＞0．05）；（3）在日粮中添加可溶性糖对氨基酸的表观消化率测值没有影响（P＞0．05）。本研究表明在回－直肠吻合猪日粮中添加10％的可溶性糖不仅可以在一定程度上弥补回－直肠吻合荷术猪在能量代谢上的亏损，而且对氨基酸消化率的测值测有影响。 相似文献