饲粮营养水平对猪背最长肌IMF含量及部分相关因子的影响

试验选用84头体重接近10 kg的杜洛克×长白×大约克三元杂交(DLY)阉公猪,随机分成2组,每组6个重复,每个重复7头猪。研究在NRC(1998)标(准对照组)和荣昌猪饲养标(准试验组)2种饲粮条件下,营养水平对DLY生长肥育期血液胰岛素、背最长肌IMFc、AMPI、R含量及ACC mRNA表达量的影响。结果表明:①荣昌猪饲养标准下,各阶段试验组背最长肌肌内脂肪含量均高于对照组,50kg时达到了显著水平(P<0.05)。②试验组背最长肌cAMP水平50kg时低于对照组(P<0.01);IR含量80kg时显著低于对照组(P<0.05)。     

吴钰琳尾巨桉废料的白背毛木耳栽培技术

通过专业调查,发现尾巨桉是栽培白背毛木耳的好原料之一,据此介绍尾巨桉栽培白背毛木耳的菌种、生产工艺流程、栽培关键技术。分析认为：利用尾巨桉锯末、边角料种植白背毛木耳,既开辟了桉树新用途,又改善了工厂卫生环境;而种植白背毛木耳的废料,又可用作育苗轻型基质、有机肥等,是循环经济的一种好的利用模式。     

在玻碳电极上用伏安法测定吡虫啉的含量

对吡虫啉在玻碳电极上的电化学行为及其测定进行了研究。在 0 2mol·L-1的NH3 NH4Cl底液中 ,用方波伏安法检测吡虫啉 ,在 - 1 2 4V (vs.Ag/AgCl)处观察到一灵敏的还原峰 ,该还原峰的峰电流与吡虫啉的浓度在 6 72× 10 -6～1 6 8× 10 -4mol·L-1呈良好的线性关系。对 1 38× 10 -5mol·L-1的吡虫啉溶液进行 6次平行实验 ,相对标准偏差为 2 36 %。实验结果表明 ,吡虫啉在玻碳电极上有吸附性质。     

连续性循环式活性污泥法在土霉素类制药废水处理中的应用

采用微电解法对土霉素类废水进行预处理 ,再经连续性循环式活性污泥处理土霉素类高浓度有机废水 ,进水的CODcr浓度在 5 30 0mg·L-1以下时 ,经过系统的处理处理后 ,CODcr降解率达 97.6 %.出水的各种指标达到了国家规定的排放标准 .     

聚L-半胱氨酸/DNA-HRP混合自组装膜修饰的过氧化氢传感器的研究

采用循环伏安法在铂电极表面聚合L-半胱氨酸制得修饰电极,再利用DNA与蛋白质的特异性结合,将小牛胸腺DNA与辣根过氧化物酶依次滴加到聚L-Cys／Pt电极表面,制备得到DNA-HRP／L-Cys／pt电极,实验证实该电极对过氧化氢具有响应快、灵敏度高、线性范围宽、稳定性好的性能,且具有良好的选择性,线性范围为1.2×10^-6～9．0×10^-3mol·L^-1,检出限：8．0×10^-7mol·L^-1.     

棉花花青素能量耗散过程维持光合机构稳定性分析

【目的】研究棉花花青素能量耗散过程维持光合机构稳定性。【方法】选取花青素含量差异较大的棉花为材料,测定花青素含量、光合色素含量、气体交换参数、叶绿素荧光参数、NDH介导的环式电子流活性、ATP合成酶活性、玉米黄质的合成速率等。【结果】随花青素含量升高,吸光能力逐渐增强,而净光合速率逐渐减弱,将面临较多的过剩激发能;NDH介导的环式电子流活性均逐渐增强,并且环式电子调控的ATP合成也逐渐增强;相对于无花青素的棉花,花青素存在的条件下,叶黄素循环的热耗散明显较弱,并且随花青素含量的增多,叶黄素循环的过程逐渐减弱,可能花青素的耗散能力逐渐增强。【结论】花青素能够作为一种光保护机制起到耗散过剩光能有效保护PSI和PSII。     

The role of cAMP in regulating the β-adrenergic response of rainbow trout (Oncorhynchus mykiss) red blood cells

The -adrenergic response of teleost red blood cells (RBCs) enables the fish to maintain or even enhance the oxygen affinity of haemoglobin during various stress situations. The role of CAMP in the pronounced -adrenergic response of hypoxic rainbow trout RBCs was studied. Rainbow trout RBCs were incubated with three different -agonists (noradrenaline, adrenaline and isoproterenol, 10^–9 - 10^–4 M) at two oxygen tensions (P_{O 2}, 155 and 8 mmHg), and thereafter cAMP accumulation and cellular water content were measured.The cAMP concentration of non-stimulated trout RBCs was ca. 1200 nmol/kg dw. Of the three -agonists used, isoproterenol was the most effective in formation of cAMP, followed by noradrenaline and adrenaline. Oxygen tension affected the accumulation of cAMP in two ways. At physiological catecholamine levels (1–100 nM) there was either no difference between normoxic and hypoxic cells or a slight increase in the normoxic ones. At high catecholamine concentrations the accumulation of cAMP was greater in the hypoxic than in the normoxic cells. Oxygen tension also affected the magnitude of cell swelling but had no effect on the catecholamine concentrations causing half-maximal swelling (EC₅₀-values). The results indicate that, at physiological catecholamine levels, the -adrenergic response of rainbow trout RBCs is mainly regulated on the level of the Na⁺/H⁺ exchange.     

Cyclic Creep Constitutive Model of Magnesium Alloy at High Temperature

With high strength-to-weight ratio and excellent technological properties, Magnesium Alloy plays a more and more important role in automotive industry. But the inferior high temperature creep resistance limited its application to power components such as engine and transmission cases. In order to investigate the cyclic creep behavior of Magnesium Alloy at high temperature, creep tests of plate specimens AM50 were conducted. Through the analysis about the microstructure and defects of AM50, an isotropic and scalar damage parameter was introduced into an existing creep constitutive model. Furthermore, a Fortran code based on numerical algorithm was developed to simulate plasticity, cyclic creep, and recovery phenomenon observed. Comparisons between calculated results and experimental data show good agreement.