超声处理鸡蛋壳对废水中磷吸附的影响

为探索鸡蛋壳对废水中磷的去除性能,考察鸡蛋壳用量、pH、初始磷浓度以及超声震荡功率对鸡蛋壳吸附磷性能的影响,同时,对鸡蛋壳吸附过程进行动力学研究。结果表明：鸡蛋壳用量为1．3 g,pH为2,初始磷浓度为24μg／mL,超声震荡功率为100 W 时,对磷的吸附率可达95．54％。其动力学过程遵循Morris 扩散模型。     

Studies on the green liver in cultured red sea bream fed low level and non-fish meal diets: Relationship between hepatic taurine and biliverdin levels

SUMMARY: The aim of this study was to investigate the cause of green liver in red sea bream fed substitute protein diets. Red sea bream Pagrus major was given either of the following diets for 28 weeks: (1) control diet (50% fish meal), (2) low level fish meal diet (15% fish meal), and (3) non-fish meal diet (0% fish meal). The green liver was observed in all groups tested, but the incidence was much higher in the experimental diet groups. The feeding of substitute protein diets reduced plasma triglyceride and cholesterol levels. However, there was no significant difference in plasma hepatic enzyme activities and plasma bile salts concentration among the treatments. Fish fed the substitute protein diets showed low hepatic taurine levels with an appearance of a biliverdin in the liver. Moreover, the proportion of ditaurobilirubin to total biliary bile pigments was significantly lower in fish fed the substitute protein diets. These data indicate that feeding of substitute protein diets did not induce any cholestatic hepatobiliary obstructions and that the low hepatic taurine level was one of the probable factors responsible for the occurrence of green liver in red sea bream fed substitute protein diets.     

蛋鸡日粮中添加苜蓿叶粉对蛋品质的影响研究

选用罗曼粉成年蛋鸡,分成3个处理,处理1喂以基础日粮,作为对照组;处理2和处理3中分别添加5%、7%的苜蓿叶粉,作为试验组。对试验数据采用t检验进行分析。试验结果表明,饲粮中添加不同水平的苜蓿草粉对蛋黄颜色有极显著促进的作用(P<0.01),对蛋的品质及蛋壳品质无显著影响(P>0.05),但添加7%的苜蓿草叶粉时对蛋壳颜色有明显的加深(P<0.01)。     

积极推进招标代理制度发展和规范招标代理机构

工程建设招标和货物采购招标已成为我国招标业的两大主要领域。本文从多方面对如何推进招标代理制度及发展和规范招标代理机构进行了详细论述。     

云南天然橡胶“走出去”与“替代种植”结合的模式——以云橡公司老挝琅南塔省南塔县梭都村替代搬迁种植务工示范项目为例

着重介绍云橡投资有限公司实施天然橡胶“走出去”与“替代种植”结合的发展模式,在此基础上研究和总结了模式实施的特点,为进一步的深化发展提供理论支持。     

单色绿光环境对孵化中种蛋蛋壳理化特性的影响

蛋壳是鸡胚发育过程中与外界环境进行气体和热量交换的重要媒介,其结构、形态等因素均为影响鸡胚发育的重要因素。单色绿光照射可缩短种蛋孵化时间,促进出雏、提高种蛋孵化率。有鉴于此,该研究针对单色绿光调控孵化过程中的种蛋蛋壳色度、蛋壳结构、色素含量及元素含量等因素进行监测,从种蛋蛋壳特性变化的角度探究单色绿光在种蛋孵化过程中促进雏鸡出雏的机制。结果表明,与传统黑暗孵化环境相比较,孵化过程单色绿光形成的光环境促使蛋壳对孵化环境产生适应性响应,蛋壳表面亮度显著降低（P<0.01）,抑制了蛋壳中绿色色素-胆绿素的分解（P<0.01）。且单色绿光有助于鸡胚吸收利用蛋壳中的Ca元素,显著促进孵化过程中蛋壳表面孔隙面积的风化增大（P<0.000 1）,提高蛋壳的通透性及散热效果,利于出雏期间雏鸡出壳,有助于促进出雏并降低孵化死亡率。该研究阐析了单色绿光孵化过程中种蛋蛋壳特性的变化,为单色绿光促进种蛋出雏及其在孵化产业的应用奠定了一定的理论基础。     

Effects of Substitute Media on Development of Potted Cyclamen percicum Mill.

Five kinds of agricultural castoffs, such as sawdust and powder of coconut coir, were used as growing media to substitute the peat moss for potted Cyclamen percicum. It showed that most of the substitute media could fit for the growth of the root system without disturbing the spatial development of the root. The root activities of the plants in substitute media were all higher or not significantly lower than that in the contrast peat moss （PM）. The substitute media might not make adverse effects on the biosynthesis of chlorophyll of C. percicum leaves, and the nutrient components contained in the substitute media itself was none of the content of mineral elements in the leaves. The morphological indexes of C. percicum plants growing in the substitute media except in the powder of coconut coir （PCC） were all better than those in the contrast PM. The synthetically evaluation index of the plant showed that the sawdust, the powder of maize core, the powder of soybean stalk, the powder of peanut hull could take place the peat moss totally in C. percicum industrialization cultivation.     

鸡蛋壳直接中和制取乳酸钙的工艺

该文利用鸡蛋壳制取乳酸钙。采用直接中和法,将经过预处理的蛋壳粉碎至一定细度,加入乳酸进行中和反应制取乳酸钙。试验过程中对直接中和反应过程中各影响因素进行了研究探讨,筛选出最佳中和反应条件。并采用了三元线性回归正交试验对试验结果进行了显著性分析。试验结果表明,加入蛋壳粉10 g、乳酸18.5 mL、蒸馏水100 mL,在中和反应温度35℃、反应时间2 h的条件下,制取乳酸钙的产率可达79.23%,质量分数达到86.93%。通过这种方法制取乳酸钙,既充分挖掘了鸡蛋壳中潜在的利用价值,又解决了蛋壳造成的环境污染问题。     

孕酮处理对蛋鸡蛋壳钙化过程中CaBP-d28k基因表达的影响

实验旨在研究孕酮对蛋鸡CaBP-d28k基因表达的影响。对产蛋高峰期蛋鸡进行孕酮和孕酮受体拮抗剂(RU-486)处理,利用实时荧光定量PCR技术(QRT-PCR),测定在蛋壳形成过程中输卵管子宫部钙结合蛋白(CaBP-d28k)、孕酮受体(PGR)的表达量;同时对血液中钙离子和孕酮浓度变化进行测定。结果表明:孕酮处理后,血液中钙离子浓度显著降低(P<0.05),输卵管子宫部CaBP-d28k表达量也显著降低(P<0.05);孕酮受体拮抗剂处理后,血液中钙离子浓度显著升高(P<0.05),输卵管子宫部CaBP-d28k表达量极显著升高(P<0.01)。结果提示,在蛋壳钙化过程中,孕酮对CaBP-d28k表达和钙离子转运起负调控作用。     

固始鹅蛋壳质量性状分析

试验旨在分析固始鹅的蛋壳质量性状，为品种资源普查提供素材。在农户散放饲养的鹅中随机收集56枚鹅蛋，对鹅蛋的蛋壳重占总蛋重的比例和不同部位蛋壳厚度进行测定。结果表明，蛋壳重占总蛋重的比例平均为12.32%；平均蛋壳厚度为0.517 mm，大多数鹅蛋的蛋壳锐端厚度比钝端和中间高。