"胶乳法"氯化天然橡胶恒压过滤特性研究

通过恒压过滤实验，用比阻法和可压缩系数法研究了“胶乳法”氯化天然橡胶悬浮液过滤的难易。同时，研究了滤液温度和浓度对过滤速率的影响。     

Efficacy of oral nicotinic acid and choline in the treatment and prevention of fatty liver in dairy cow

Nicotinic acid (N.C.)and choline were given orally to the periparturient cows to treat and prevent fatty liver.Blood parameters of glucose,β-hydroxybutyrate,albumin,total protein,magnesium,aspartate aminotransferase(AST) and non-esterified fatty acid(NEFA) were measured.There were no significant differences between the reated and untreated groups in the plasma concentrations of albumin,total,protein and magnsium.Significant decrease in plasma concentrations of β-hydroxybutyrate,NEFA and AST were observed in the treated cows following administration of N.C.and choline.All the fatty liver cows(100%) treated with N.C.and choline recovered within 5 weeks after calving compared with 71.4%(5/7) of untreated cows recovered.The incident ate of fatty liver postpartum in the cows with N.C.and choline given 2 weeks before calving was 30%(3/10),and the affected cows had a range of mild to moderate fatty liver whilst the incident rate was 50%(5/10)in the untreated cows.which had a range of mild to of severe fatty liver,Meanwhile,the treated cows had a significant higher prodection of milk and shorter intervals from calving to uterine involution,to the first postpartum ovulation and to conception.     

鱼虾的维生素需要量与混合维生素配方

维生素可分两大类：一类是水溶性维生素，包括维生素B1、B2、B6、B12、对氨基苯甲酸、胆碱、叶酸、肌醇、烟酸、泛酸和生物素，一类是脂溶性维生素，包括维生素A、D、E、K。     

氯化亚铜催化的月桂烯氢氯化反应的研究（I）：产物分布和反应机理

研究氯化亚铜催化的月桂烯氢氯化反应的产物分布和反应机理，考察了催化剂和稀释剂对产物分布的影响。结果表明：（１）月桂烯的氢氯化反应生成月桂烯基氯、芳樟基氯、橙花基氯、香叶基氯和α－松油基氯５种单氯化物，产物中３种烯丙基型氯化物的含量约达到９０％；（２）月桂烯的氢氯化反应是通过共轭双键吸附在催化剂表面上，并与吸附的氯化氢形成表面活化络合物进行的，该表面活化络合物经两个共振结构的碳正离子中间体分别生成芳     

电解氯化海水

为了工船和陆上企业部门工艺需要利用海水，海水必需进行初步消毒。     

高产奶牛过瘤胃胆碱营养研究进展

胆碱在单胃和幼龄反刍动物上的应用,国内外有较多的研究报道,已被人们广泛认可。对于成年奶牛,由于其体内能够以蛋氨酸、维生素B12等为原料进行生物合成,因此在生产实践中,奶牛的胆碱营养容易忽视。然而奶牛体内合成的胆碱仅可以满足维持和低泌乳量的需要,对于高产奶牛,尤其是在泌乳早期和高峰期,常表现为能量负平衡,此时对胆碱的需要量很大。若胆碱供应不足会造成奶牛不同程度的肝脂肪浸润,并伴有生产性能和繁殖性能的降低。然而,若直接向奶牛日粮中添加胆碱会被瘤胃微生物降解,因此需要对高产奶牛补充能够通过瘤胃的胆碱。1胆碱的生理作…     

对虾对维生素B1,B6和氯化胆碱的需求

对虾对维生素Ｂ＿１、Ｂ＿６和氯化胆碱的需求福建省水产研究所吴善，蔡清海，洪国裕关于日本对虾对维生素的需求，日本研究人员曾经报道在饵料中补充维生素Ｃ和补充葡萄糖合剂对对虾的生长效果显著，同时，还论证了饵料中维生素Ｃ、环已六醇和氯化胆碱是对虾的正常生长的...