狼尾草刨花板制造工艺研究

采用正交实验设计的方法,研究了施胶量、热压温度、热压时间等工艺因素对狼尾草刨花板的静曲强度、弹性模量、内结合强度、吸水厚度膨胀率等性能的影响.研究结果表明:狼尾草应用在刨花板制造中是可行的;其中狼尾草刨花板制造的最佳工艺参数为施胶量13%、热压时间40 s/mm(板厚)、热压温度180℃.     

竞争性抑制酶联反应在量热式农残生物传感器中的试验研究

以量热式农残生物传感器为研究对象,借鉴免疫分析方法,进行竞争性抑制酶联反应在量热式农残生物传感器中的试验研究。结果表明,在甲胺磷浓度为0~0.004 mg.kg-1范围内,甲胺磷含量和放热量之间的线性较好,竞争性抑制酶联反应分析法测农药残留的最低检测限为0.0011 mg.kg-1,每次测定时间为20 min。     

Variation in the immune status of two Australian pig breeds

Objective To investigate the variation in immune competence of two Australian pig breeds.
Design A panel of immune tests were used to assess breed and sire differences in weaner piglets of Large White and Duroc breeds.
Procedure All piglets were immunised against porcine leptospirosis. Blood samples were taken for studies on lymphocyte phenotypes, mitogenic responses of blood cells and serological analysis.
Results Significantly larger blood leucocyte numbers were found in Large White piglets compared with Duroc piglets after vaccinations. No significant difference in concanavalin A induced blood cell proliferation was found between these two breeds before or after vaccinations. Some significant breed variation in blood lymphocyte phenotypes was found. While the age-related changes of lymphocyte phenotypes were similar for the two breeds, the Large White breed had significantly larger numbers of CD2+ and CD4+ cells than the Duroc breed after the two vaccinations. There were also significant sire effects on CD8+ cells within the Large White breed after the first vaccination. No significant breed difference was detectable in serum IgG concentrations but sire differences within each breed before the primary vaccination were found. The serum antibody response to vaccination against leptospirosis was generally small, and showed no variations due to either breed or sire. No gender effects were found during the entire study.
Conclusion The study demonstrated significant differences in some important immune components of the pig breeds studied. This may in turn indicate the variation in their immune competence or disease resistance. However, further investigation into the heritability and correlation with specific immune responses is required.     

不同基因型和营养对山羊生长性能、胴体品质及肉质的影响

【目的】探讨不同基因型和营养物质在改善老挝山羊的生长性能、胴体特征和肉质中的效果。【方法】采用2×2双因素试验,以本地山羊品种Lat为对照,对Lat与越南Bach Thao公山羊的杂交F1（BT×L）进行比较。从每个基因型中选择30头7月龄的成长公山羊并分成两组,其中一组采用传统饲喂方法即自由放牧,另一组采用改良饲喂方法,即放牧并任意采食木薯渣和矿物砖。试验期间测量山羊平均日增重（ADG）,在后期每组选择3只山羊宰杀并测定胴体特性（胴体组成和初分切肉）、肉质（剪切力、肉色、pH、滴水损失率和蒸煮损失率）。【结果】杂交山羊F1的平均日增重（60．02g／头）明显高于本地山羊（38．45g／头）,增幅为56．09％;饲喂补充木薯渣和矿物砖的山羊平均日增重（55．45g／头）则显著高于未添加对照组（43．02g,头）,增幅为28．89％。杂交繁育和饲喂补充物对山羊胴体品质如屠宰率、前肢百分率、后肢百分率及胸肌率没有显著影响,但杂交F1山羊的脖子极显著大于本地山羊,而其腰腹部切口极显著小于本地山羊。在两种不同饲喂管理条件下,Lat和杂交F1山羊的肉质特性没有显著差异。【结论】老挝本地山羊Lat与Bach Thao公山羊杂交及在饲料中补充木薯渣和矿物砖,可提高山羊肉产量且对其肉质无任何负作用。     

豆胶的热反应特性及胶合特性分析

大豆蛋白胶因其可再生、可降解和环保性而受到广泛关注。豆胶的热反应特性和胶合特性研究结果显示:以20℃/min速率升温时,豆胶胶液在157℃时完全固化,在173℃开始降解;胶合板的胶合强度与涂胶量呈线性正相关。按热压温度160℃、热压时间80s/mm、压力1.6MPa、双面涂胶量450g/m2的工艺制备豆胶胶合板,其湿态胶合强度为0.78 MPa,满足GB/T 9846.3-2004《胶合板第3部分:普通胶合板通用技术条件》中Ⅱ类胶合板的要求。     

松香在木材防腐中的应用

从松香降低木材吸湿性、对水基木材防腐剂的固着以及抑木腐菌松香衍生物的制备3个方面讲述了松香在木材防腐中的应用现状.较高浓度的松香乳液处理对提高木材的耐腐性能有一定帮助,较低浓度的松香乳液处理就表现出对易流失的铜盐类防腐剂较好的固定作用.以松香为原料合成的松香胺类、季铵盐等衍生物能够赋予木材较好的耐腐性能,咪唑啉等其它活...