局部通风对奶牛体表温度和呼吸频率的影响

通过对泌乳牛舍局部通风散热效果的研究,对散栏式奶牛舍夏季防暑降温措施的使用效果进行评价,并为其改善提供参考,以减少夏季高温对奶牛生产性能的影响,为奶牛养殖企业生产效益的提高提供保障。结果表明,气温对奶牛的体表温度和呼吸频率均有显著的影响(P0.05);当气温为30℃时,局部通风显著降低奶牛的体表温度(P0.05),但其对奶牛的呼吸频率无显著影响(P0.05)。     

山核桃壳酸解制备木糖工艺与动力学

研究了反应时间、温度及盐酸浓度对山核桃壳酸解制备木糖的影响.建立了山核桃壳酸解制备木糖的动力学模型,并通过实验验证了该模型.实验得最佳酸解制备木糖工艺参数为:反应温度363.15 K,盐酸浓度1.2 mol/L,反应时间5h.在实验范围内,得到山核桃壳酸解生成木糖的表观活化能为70.91 kJ/mol,反应速率常数k1与反应温度T、盐酸浓度C的关系为Ink1=21.454 0-8.529 0/T-5.063 21nC.     

山核桃外壳单宁提取的工艺条件研究

用有机溶剂法从山核桃外壳中提取单宁,不同的溶剂,不同的温度,不同的提取时间,不同的固液比会影响单宁的提取率,本文采用L9（43）正交实验,锌离子络合滴定法测定提取液中的单宁含量,实验结果表明提取溶剂为水,浸提时间为12 h,温度为50℃,溶剂与溶质比为6∶1为最佳提取工艺。     

Study on Heredity Rules of Cyclamen persicum Colors

INTRODUCTION Cyclamen persicum is a kind of bulbous flower with colorful and peculiar figures, blooming during Christmas and Chinese New Year. It has become one of the most important potted flowers in the domestic and international markets (Kang Lifang 2002). At present there are more than 10 kinds of colors for main C. persicum varieties. But there is a lack of understanding on heredity rules of C. persicum and its breeding technique in China, the seeds of C. persicum for potted flow…     

非洲大蜗牛螺壳标准样品的研制

本文通过非洲大蜗牛的采集,鉴定,饲养,螺壳制作,样品检验,定值等多个环节,梳理了该样品的制作环节。最终制备的标准样品均匀性和稳定性均达到了国家标准样品的技术要求,可用于非洲大蜗牛的标准质控品。该产品有利于检测质量控制、能力验证、文字标准的执行,也有利于结果的溯源,同时达到全国鉴定一致的作用。     

Shrimp shell as a potential sorbent for removal of arsenic from aqueous solution

This study examined the ability of shrimp shell to remove arsenic (As) from aqueous solutions. The shells of two species of shrimp, black tiger shrimp Penaeus monodon and white shrimp Litopenaeus vannamei, were chosen to be the sorbents. Laboratory exposure experiments estimated uptake and depuration rate constants (i.e., k ₁ and k ₂) as well as the bioconcentration factors (BCF) of the shells of the two shrimps. A first-order one-compartment model was presented to describe the uptake kinetics of As in shrimp shell. The resulting k ₁, k ₂, and BCF values of black tiger shrimp were 0.034–1.722 ml/g/day, 0.007–0.345 g/g/day, and 5.08 ± 1.56 ml/g, while those for white shrimp were 0.053–0.523 ml/g/day, 0.011–0.237 g/g/day, and 3.95 ± 1.88 ml/g, respectively. The sorption capacities of black tiger shrimp shell and white shrimp shell were 1.08 × 10⁻⁴–6.66 × 10⁻³ and 1.04 × 10⁻⁴–3.26 × 10⁻³ mmol/g, respectively. The sorption capacity of shrimp shell increased with the initial As concentration in water. Shrimp shell, as a waste material, could be potentially used for the removal of As from an aqueous medium. Although the As-removal capacity of shrimp shell was lower than those of natural and chemical sorbents, using shrimp shells as sorbents is less expensive and could increase the additional value of shrimp products.     

基于不同颜色山楂花MYB家族的挖掘与比较分析

为了研究MYB转录因子家族对山楂花色的影响,明确MYB转录因子在花色芽变品种中的表达情况,采用MYB蛋白质理化性质分析、motif结构预测、基因进化树分析以及基因表达量分析等方法对转录组数据进行深度挖掘.结果表明,共筛选出73个MYB转录因子,其中35个1R-MYB成员、36个2R-MYB成员、2个3R-MYB成员.1...     

杨木单板染色工艺与表面材色的关系

试材为I-214杨木单板,以染料酸性大红GR和活性艳蓝KN-R为染化试剂,选取染液质量分数、染色温度、浸染时间为考察工艺因子,进行单板染色试验。通过多光源分光测色计测定染色单板的表面材色,用CIE(1976)L*a*b*Diagram对其进行颜色表征。结果表明:染色单板表面材色与着色度的变化与染液质量分数、染色温度、浸染时间的关系不同,高温下染色时染液质量分数增大,着色度(ΔE*ab)提高;染色时间延长,着色度有所增加或无明显变化;染色温度对表面染色影响较小。酸性染料和活性染料染色的单板材色变化幅度接近。     

养殖青蛤生长发育规律的探讨

本文分析了养殖青蛤的体重和壳长的生长发育规律并利用多项式拟合了养殖青蛤壳长和体重的生长发育曲线,同时用幂函数阐明了体重和壳长的关系。     

湖北梁子湖四种螺的形态与壳强度初步研究

测定了湖北梁子湖的铜锈环棱螺（Bellamya aeruginosa）、长角涵螺（Alocinma longicornis）、中华沼螺（Parafossarulus sinensis）和耳萝卜螺（Radix auricularia）的壳形态性状和壳强度。四种螺类壳形态可量性状之间以及壳形态可量性状与壳强度之间均呈显著的正相关,且存在明显的种间差异。还探讨了螺类形态和壳强度与反捕食功能的关系。