Morphological relationship between intercalated duct and pancreatic islet in streptozotocin and/or camostat mesilate administrations in the chicken

Present electron microscopical and immunocytochemistrical studies elucidated some morphological relationship between intercalated duct (ICD) and pancreatic islet cells in the chicken in streptozotocin (STZ) and/or camostat mesilate (CM) administrations. Twenty-one chickens were set into four experimental groups: (1) control group, (2) STZ administration group, (3) CM administration group, and (4) STZ + CM administration group. Cytoplasms of ICD cells stained more strongly with eosin in STZ administration group than other groups, and electron-dense materials and intercalated processes between ICD and islet cells were also increasing in time dependence in STZ administration. Number of pancreatic islet in STZ + CM co-administration was about 3.1 times larger than other groups. Many small sized cells were detected at surrounding area of ICD and they incorporated 5-bromo-2'-deoxyuridine better than other experimental groups. Present morphological data suggested that ICD cells might support some tolerances of pancreatic endocrine cells against toxic substances and also involve in regeneration of new pancreatic islet cells in STZ + CM co-administration.     

内蒙古白绒山羊初级毛囊的无血清培养基培养

本实验对内蒙古白绒山羊初级毛囊的分离方法和体外无血清培养条件进行了研究.结果表明(1)改良毛囊机械分离法优于常规毛囊机械分离法;(2)对内蒙古白绒山羊初级毛囊培养,Williams E培养基显著优于DMEM/Fl2培养基,37℃显著优于31℃.基本建立内蒙古绒山羊初级毛囊37℃,Williams E培养基体外无血清培养模型.     

羊乳腺上皮细胞的形态观察

用组织块培养法获得山羊乳腺细胞原代培养物,并根据山羊乳腺成纤维细胞与上皮细胞对胰蛋白酶的敏感性不同将二者分离纯化。对细胞形态进行光镜观察发现:纯化的山羊乳腺上皮细胞传代至第15代时其生长仍正常。山羊乳腺上皮细胞含不同的细胞类型,大多数上皮细胞呈短梭形或多角形,呈蜂窝状;部分细胞呈圆饼状,体积较大;部分细胞呈长形。纯化的乳腺上皮细胞增殖可形成圆顶型结构,呈乳头状,称之为乳球体。     

钙源及水平对肉仔鸡体内电解质平衡及血脂水平的影响

本文旨在研究采用不同钙源及水平的日粮对肉仔鸡体内电解质平衡及血脂水平的影响.试验采用二因素有重复完全交叉区组设计,选用144只健康AA肉仔鸡,随机分成4处理,每个处理6个重复,每个重复6只.饲粮采用2种钙源(碳酸钙、氯化钙)、2个钙水平(0.90%、1.15%),试验期28 d.结果表明:①与碳酸钙相比,日粮中氯化钙可降低血清Na++K+-Cl-水平(P<0.05)、提高Cl-水平(P<0.05),降低腹脂率(P<0.05)和血脂水平.②高水平钙可提高血清Ca2+水平(P<0.05).降低腹脂率和血脂水平(P<0.05).③钙源和水平互作对各指标均无显著影响(P>0.05).总之,日粮选用1.15%氯化钙虽对电解质平衡产生了一些影响,但可以较好地降低腹脂率和血脂水平.     

生物入侵机理研究进展

综述生物入侵机理的生态学研究、生理学研究、分子生物学研究,并展望今后的研究方向。     

基于岩心图像压缩的编辑器设计

岩心图像数据量很大,不便存储和传输,需要进行压缩。岩心图像编辑器采用标准的JPEG压缩方法,需要对编辑器进行设计。编辑器结构分为编码过程和解码过程,其功能包括FDCT(正向离散余弦变换)和IDCT(DCT逆变换)、量化和反量化、DC编解码和AC系数排序、熵编码和熵解码。可实现岩心图像的无损压缩。     

冷应激对肉仔鸡生长性能、免疫及抗氧化功能的影响

冷应激可导致肉鸡生长缓慢、发病及死亡率高等,制约着养鸡业的发展.本文综述了冷应激对内仔鸡生长性能、免疫和抗氧化功能的影响.     

Leaf photosynthesis is enhanced in normal oil maize pollinated by high oil maize hybrids

The grain yield of normal oil maize (Zea mays L.) might increase when pollinated by high oil maize (HOM) hybrids because of heterosis. To testify that the grain yield increase might be a result of improved photosynthetic rate and related traits, the normal oil maize (NOM) hybrid, Nongda108, was cross-pollinated by three HOM hybrids, HOM202, HOM115 and HOM4515 (for short as ND108pHOM202, ND108pHOM115 and ND108pHOM4515). We found that the ND108pHOM202 and ND108pHOM115 exhibited higher net photosynthetic rate (P_n), accompanied by larger stomatal conductance (g_s) and transpiration rate (E). Moreover, delayed leaf senescence was observed in their leaves, including larger leaf area index (LAI) and higher Chl content and Chl a/b ratio. Apart from higher phosphoenolpyruvate carboxylase (PEPCase) activity, the soluble proteins were also higher in the two cross-pollinations. The higher leaf photosynthesis could explain the grain increase in ND108pHOM202 and ND108pHOM115. However, ND108pHOM4515 exhibited a decreased photosynthetic characteristic and yield performance. Significantly positive relation between grain yield and biomass (r² = 0.96, P < 0.05), P_n and biomass (r² = 0.74, P < 0.05) also suggested that the yield increase in the two cross-pollination treatments was generally owing to the higher photosynthetic rate and related photosynthetic traits.