溶菌酶对鸡全蛋液乳酸菌发酵性能的影响   总被引：1，自引：0，他引：1  

董开发  佘世望 《江西农业大学学报》1996,18(3):264-269

研究以保加利亚乳相菌和嗜的热链球菌作为发酵剂。笔首先测定了鸡全蛋液中的溶菌酶活力，然后研究了溶菌酶对试验用乳酸菌发酵性能的影响，不同杀攻方法对鸡全蛋液中溶菌酶失活率及鸡全蛋液乳酸菌发酵性能的影响。  相似文献   

豌豆潜叶蝇的空间分布型及应用研究   总被引：1，自引：0，他引：1  

张京社  李捷 《山西农业大学学报(自然科学版)》1993,13(3):192-194

应用离散性指标对豌豆潜叶蝇在采种大白菜田的分布进行了研究,结果表明:幼虫、蛹和种群均为聚集分布.聚集均数(λ)值分析表明:聚集的原因主要是由昆虫行为引起的。豌豆潜叶蝇种群的理论抽样数公式为:N=1681.25/x+0.3075.  相似文献   

贵州甘蔗新品种（系）引种试验初报     

龚德勇  周正邦  易代勇  刘凡值  谢惠珏 《勤云标准版测试》2004,(5)

以桂糖11号为对照,引进桂糖系列(桂糖16、17、18、19、桂辐97/18),新台糖系列(ROC22、25、26),云蔗系列(云蔗89/07、89/157、89/351)以及福农91/4710、闽糖86/2121、粤农91/854、粤糖93/159共15个新品种(系)在贵州省贞丰县白层蔗区进行了适应性观察和对比试验。新植年结果表明,供试品种(系)能较好地适应试验区的自然气候和土壤条件,基本表现了各自的生产特性和产量水平,其中有桂糖16、桂糖19、桂辐97/18、云蔗(89/07、89/157、89/351)、ROC22、ROC25、ROC26、闽糖86/2121共10个甘蔗品种(系)的蔗茎产量和产糖量分别超过对照种产蔗量108.89t/hm2和产糖量14.96t/hm2的产量水平,其余5个参试品种材料的蔗茎产量和产糖量比对照种较低,各品种(系)的抗逆性、宿根性等还在进一步研究中,仅供参考。  相似文献   

福建省农林作物白蚁种类及其区系探讨     

佘春仁  潘蓉英  范国成 《福建农林大学学报(自然科学版)》1996,(2)

对福建省农林作物白蚁种类进行全面的普查，得知共有４科１６属５４种，其中的２６种为福建省的特有种．将所搜集的５４种白蚁的地理分布、寄主植物、海拔高度等的不同情况，并参照有关白蚁区系划分的意见，对福建省农林作物白蚁的区系作一概括的探讨．为今后福建的白蚁研究，提供有益的资料  相似文献   

Clonal production and organization of inhibitory interneurons in the neocortex     

Brown KN  Chen S  Han Z  Lu CH  Tan X  Zhang XJ  Ding L  Lopez-Cruz A  Saur D  Anderson SA  Huang K  Shi SH 《Science (New York, N.Y.)》2011,334(6055):480-486

The neocortex contains excitatory neurons and inhibitory interneurons. Clones of neocortical excitatory neurons originating from the same progenitor cell are spatially organized and contribute to the formation of functional microcircuits. In contrast, relatively little is known about the production and organization of neocortical inhibitory interneurons. We found that neocortical inhibitory interneurons were produced as spatially organized clonal units in the developing ventral telencephalon. Furthermore, clonally related interneurons did not randomly disperse but formed spatially isolated clusters in the neocortex. Individual clonal clusters consisting of interneurons expressing the same or distinct neurochemical markers exhibited clear vertical or horizontal organization. These results suggest that the lineage relationship plays a pivotal role in the organization of inhibitory interneurons in the neocortex.  相似文献   

黄土高原典型植被覆盖下SPAC系统水量平衡模拟   总被引：2，自引：0，他引：2  

佘冬立  邵明安  俞双恩 《农业机械学报》2011,42(5):73-78

应用土壤-水-大气-植物整合模型(SWAP),在野外观测试验基础上对坡耕地(豆地)、长芒草地和苜蓿草地土壤-植被-大气系统中的水循环进行了数值模拟.结果表明,土壤水分和储水量模拟结果与实测值具有很好的一致性;长芒草地水分收支基本平衡,苜蓿草地的水分支出是坡耕地(豆地)的1.38倍,其中苜蓿的蒸腾耗水量是坡耕地(豆地)的3.88倍,这是引起苜蓿草地群落过度消耗土壤储水而呈现负补偿的主要原因.农地退耕还林还草后会增加SPAC系统水分支出,如果植被群落耗水过大很可能使土壤干化.  相似文献   

3-甲基-4-硝基酚对雄性小鼠生殖毒性的研究     

岳卓  佘锐萍  朱金凤  常玲玲  于品 《中国动物检疫》2011,28(6):50-52

目的探讨3-甲基-4-硝基酚(PNMC)对雄性小鼠的生殖毒性作用。方法 20只小鼠随机分成阴性对照组和PNMC组(分0.9、9和90mg/kg·bw组),经口灌胃染毒30天,观察睾丸和精子的形态变化。结果染毒组小鼠各剂量睾丸生精细胞发生坏死,曲细精管腔内出现细胞团,精子细胞分化异常,形成均质红染颗粒,睾丸曲细精管生精上皮/直径比值在90mg/kg组明显高于对照组;染毒组小鼠精子畸形率明显高于对照组(P<0.05),并且随着染毒浓度的增加,畸形率有增加的趋势。结论 3-甲基-4-硝基酚不仅可以引起生精细胞坏死和抑制精子形成,还可以诱导精子畸变,从而对生殖系统造成损伤。  相似文献   

大棚土壤盐分累积特征与调控措施研究   总被引：23，自引：5，他引：23  

李刚  张乃明  毛昆明  史静  佘丽娜 《农业工程学报》2004,20(3):44-47

通过对昆明地区不同年限的大棚土壤的管理现状调查分析及采集次生盐渍化严重的土壤做调控盐分的盆栽模拟试验，研究了保护地大棚土壤次生盐渍化的形成特征以及土壤调理剂对大棚土壤盐分的调控效果，结果表明：随着大棚年限的增长，耕层土壤的盐分在增加，盐分组成以Ca²⁺和NO^-₃为主，0～60 cm土层的盐分剖面由露地的直筒型向倒锥形发展，由泥炭、沸石、锯末等改良材料组合成的土壤调理剂控盐效果显著，耕层土壤全盐含量降幅在19％～32％之间。  相似文献   

Effect of weaning on small intestinal structure and function in the piglet.   总被引：5，自引：0，他引：5  

Xianhong Gu  Defa Li  Ruiping She 《Archives of Animal Nutrition》2002,56(4):275-286

Fifty-four piglets were selected from 12 litters weaned at 17 (Treatment 1), 21 (Treatment 2), 28 (Treatment 3) and 35 (Treatment 4) days old, respectively, to determine the effect of weaning age on small intestinal villus morphology, immunology and histochemistry. From proximal duodenum, proximal jejunum, distal jejunum and middle ileum, intestinal samples with three replicates (piglets) in each treatment were taken at 18, 22, 28 and 36; 22, 28, 36 and 43; 28, 36, 43, and 50; and 18, 22, 28, 36, 43 and 50 d of age in Treatment 1, 2, 3 and 4, respectively. This was equivalent to 12 h, 3 d, 1 week, 2 week postweaning in Treatment 1; 12 h, 1 week, 2 week, 3 week postweaning in Treatment 2 and 3, and all the same age in Treatment 4 as in Treatment 1, 2, 3, respectively. The results showed that villous height of duodenum and proximal jejunum decreased significantly in Treatment 1 and 3. Crypt depth in the duodenum, proximal jejunum and ileum also decreased significantly in Treatment 1. Date had significant effect on villous height of the duodenum, distal jejunum and ileum with the shortest on day 29 and crypt depth of all positions increased with piglet age except the crypt depth in proximal jejunum decreased on day 50. Weaning age and day of age had significant effects on intraepithelial lymphocyte (IEL) number and goblet cell (GC) number at all positions of small intestinal mucosa in piglets. The number of IEL at all segments of small intestinal mucosa in Treatment 3 increased significantly compared to those in other treatments, but IEL number at all locations of small intestinal mucosa in Treatment 2 decreased significantly compared to those in other treatments. The number of GC in small intestinal mucosa increased significantly in early-weaned (< day 21) piglets. It appears that providing fluid milk replacer for a few days postweaning could dramatically reduce the negative impact of weaning on villous morphology and digestive and absorptive function, especially in pigs weaned prior to 3 week of age. Finally, as weaning age was reduced, GC had a greater role in intestinal duct protection.  相似文献   

山羊痘苗对羊口疮的交叉免疫试验   总被引：1，自引：0，他引：1  

吴润  余世红 《甘肃农业大学学报》1992,27(4):350-353

在天祝种羊场对羔羊、怀孕母羊共2,189只,用山羊痘苗进行了羊口疮(Orf)交叉免疫试验。通过观察发病率和攻毒试验来确定免疫效果。山羊痘苗一次免疫组羔羊可抵抗1个MID/0.05ml的Orf病毒攻击,三次免疫组羔羊可抵抗10个MID/0.05ml的病毒攻击。山羊痘苗免疫组羔羊发病率比同期平均发病率可降低50％。对临产前一个月的怀孕母羊用山羊痘苗免疫,可保护所产羔羊在哺乳期不发生本病。  相似文献