1-MCP对番荔枝果实低温保鲜效果的研究

1-MCP(1-甲基环丙烯)是近年来国内外研究比较多的一种乙烯受体抑制剂,它能不可逆地作用于乙烯受体,阻断乙烯的正常结合,抑制其所诱导的与果蔬、切花后熟或衰老相关的一系列生理生化反应[1]。与硫代硫酸银、2,5-降冰片二烯(2,5-NBD)和重氮基环戊二烯(DACP)等乙烯作用抑制剂相比,     

设施果园释放熊蜂授粉试验

设施果树的昆虫授粉，目前多数用蜜蜂授粉，但其活动温度较高，相对缩短了其有效授粉时间，致使达不到理想的坐果率。为此，山东省淄博京鲁生物授粉有限公司筛选了一种专为设施作物授粉的蜂种熊蜂，并进行工厂化生产取得成功。它活动温度低，飞翔能力强，访花次数多，专以花粉为食，不采蜜。为了验证熊蜂在设施果树上的授粉效果，我们在2004年舂小规模试验取得成功的基础上（试验结果已刊登在《北方果树》2004年第6期上），于2005年春进行了大规模对比试验，现将2005年试验结果报告如下。     

GST、6×His融合表达杆状病毒转移载体的构建

将pGEX-3X中由血吸虫（Schistosomajaponicum）编码的26kD谷胱甘肽转移酶基因Sj26和凝血因子Xa凝血酶位点引入到BacPAK8构建了融合表达杆状病毒转移载体BacSj26;将28kD的谷胱甘肽转移酶基因通过PCR突变消除终止密码后,引入BacPAK8构建了融合表达转移载体BacGST28。将P(MFHT)中的6×His序列克隆进BacPAK8,从而构建了6×His融合表达转移载体BacHis。这些融合表达转移载体的构建,为表达产物的一步纯化奠定了基础。     

葡萄糖氧化酶的发酵生产与发酵工艺的研究

葡萄糖氧化酶是酶应用技术领域中一种非常重要的酶,作为国家允许使用的酶制剂之一,它在食品、医药、饲料等行业中得到了广泛应用.该文简要介绍了葡萄糖氧化酶及两种菌种的葡萄糖氧化酶的发酵生产,对发酵工艺的影响进行了探讨,并展望了其在食品工业上的应用前景.     

A Study of the Vertical Vibration of the 4200 Thick Plate Rolling Mills

In this paper,the mill stand and the rolled piece were studied as a system. Based on the disoreted masses and the deformation of bending curve of the roller and roll housing, according to Rayleigh method,the equivalent mass and and the equivalent stiffness of the mode were solved,and set up a multiple degree of freedom vibration dynamic model. And also did theoretical analysis and calculation with an exapmle of the 4200 thick plate rolling mills.     

中草药与卵黄抗体复合添加剂对肉鸡禽流感的保护效果

为研究中草药与卵黄抗体复合添加剂的效用，观察不同配比（1：1．1：08．1：0．5．1：0．2）的中草药与即黄抗体复合添加剂在AA肉公鸡日粮中的应用。试验结果表明．预防禽流感保护率达87．5％～97．5%．使用后在肉鸡体内的毒效期为18～21d．对肉鸡日增重、饲料转化效率有一定促进作用，其中．以1：1配比的应用效果最佳。     

Genetic diversity and structure of Munronia delavayi Franch. (Meliaceae), an endemic species in the dry-hot valley of Jinsha River,south-western China

Munronia delavayi Franch. (Meliaceae) is a vulnerable perennial species that is narrowly distributed and endemic to the dry-hot valley of the middle/lower Jinsha River. However, 12 hydropower stations are currently scheduled to be built in the middle and lower Jinsha River drainage and their distribution overlaps with the range of M. delavayi. The construction of these hydropower stations will cause flooding of the adjacent habitats that support M. delavayi and will change the local ecological environment, which may result in a new and dangerous situation for the survival of this species. Our aim was to evaluate the population structure and propose the most suitable conservation strategy for M. delavayi to support its adaptive potential. In this study, we collected 70 individuals from seven populations that covered most of the geographic range along the Jinsha River and investigated the population diversity, genetic structure and demographic history of this species by analyzing the variations in one mitochondrial marker (18sf-5sr), two non-coding chloroplast DNA regions (trnT-trnL, trnS-trnG), and one nuclear DNA marker (Gs687f-994r). As a result, three mitotypes, nine chlorotypes and six haplotypes with high genetic diversity (H _T = 0.580, 0.774 and 0.740) were detected based on mtDNA, cpDNA and nDNA and a strong genetic structure (F _ST = 0.855 and 0.545) was detected based on cpDNA and nDNA. Our study also indicated that habitat fragmentation and limited gene flow may result in the genetic differentiation of this species and that the population distributed in Qiaojia, Yongshan and Panzhihua should be proactively protected based on the conservation genetic analysis.     

龙须草核型研究

本文首次报道国产龙须草（Eulaliopsis binata）的染色体核型。龙须草的体细胞染色体数目是：2n=40；核型公式2n=go=38m＋2m（sat）。并讨论了龙须草的倍性等核型特点。     

丁酸梭菌在家禽生产中应用的研究进展

丁酸梭菌作为一种益生菌,存在于人和动物的肠道中,不易受到胃酸、消化酶和胆汁酸等因素的影响,不仅可以通过把营养物质降解成丁酸为动物提供营养与能量,而且可以保护肠道健康,促进营养物质的吸收和动物的生长,以及增强免疫功能等,因此丁酸梭菌可以作为饲料添加剂用于畜禽生产。本文对丁酸梭菌对家禽生理、生产性能的影响及其机制进行综述,以便为丁酸梭菌在家禽生产中的应用提供参考。     

南极半岛海洋气候区的土壤 I.风化作用

南极海洋性气候区是南极风化与成土作用相对较强的地区。本文在对本区气候特点进行分析的基础上,明确了冻胀风化是本区最主要的物理风化形式,强烈的现代地貌过程对本区风化与成土过程具有显著影响。阐述了本区内化学风化的主要过程、机制与产物,同时指出生物因素在本区的岩石风化与原始土壤形成过程具有重要意义。