Simultaneous determination of six isoflavonoids in commercial Radix Astragali by HPLC-UV

A HPLC-UV method for the quantification of six major isoflavonoids, calycosin 7-O-beta-D-glucoside (1), formononetin 7-O-beta-D-glucoside (2), (6alphaR, 11alphaR) 3-hydroxy-9,10-dimethoxypterocarpan-3-O-beta-D-glucoside (3), 7,2'-dihydroxy-3',4'-dimethoxyisoflavan-7-O-beta-D-glucoside (4), calycosin (5) and formononetin (6), in Radix Astragali (Huangqi) was developed and validated. The method was proven to be sensitive, specific, accurate and precise, as well as effective and easy.     

沙蒿、油蒿空间构件及固沙机制研究

油蒿和沙蒿同属菊科、蒿属的沙生半灌木，抗旱性强，生态幅宽，在沙区人工植被中可天然更新，是我国干旱沙区优良的固沙植物种。由于油蒿能够进行光合的部件远多于沙蒿且相对沙蒿能够更好地利用空间资源，在相同的时间内油蒿经光合沉积的生物量远大于沙蒿。受个体空间结构、生物量分配模式及种群整体特征的共同影响，在生存环境相同的情况下油蒿的个体及种群固沙效益要比沙蒿高。     

不同类型昆虫粉对肉鸡生长性能、血液生化指标及肠道发酵的影响

本研究旨在评估昆虫粉对肉鸡生长性能、血液生化指标及肠道发酵的影响。试验将432只1日龄商品肉鸡分为3组,每组6个重复,每个重复24只。各组肉鸡分别饲喂基础日粮（对照组）、基础日粮+0.5%黄粉虫粉（黄粉虫组）和基础日粮+0.5%水虻粉（水虻组）,饲养试验为期4周。结果：对照组15～28?d肉鸡料重比较黄粉虫和水虻组分别显著提高8.10%和4.13%（P＜0.05）,对照组1～28?d肉鸡料重比较黄粉虫组显著提高5.35%（P＜0.05）。黄粉虫和水虻粉组肉鸡血清白蛋白和磷浓度显著高于对照组（P＜0.05）,但胆固醇浓度显著降低（P＜0.05）。黄粉虫组肉鸡血清GOT活性显著低于对照组和水虻粉组（P＜0.05）。水虻粉组血清MDA浓度显著低于黄粉虫组（P＜0.05）,但血清SOD活性表现最高（P＜0.05）。对照组肉鸡盲肠α-葡萄糖苷酶和β-半乳糖酶活性显著高于水虻粉组（P＜0.05）,而β-葡萄糖苷酶活性显著高于黄粉虫组（P＜0.05）。对照组盲肠内容物乙酸、丙酸和挥发性脂肪酸总量浓度显著高于处理组（P＜0.05）。结论：1～28?d肉鸡日粮中补充0.5%黄粉虫可以改善饲料效率,降低血清胆固醇浓度,而0.5%水虻粉可以提高肉鸡血清抗氧化功能。 [关键词]昆虫粉|肉鸡|生长性能|血液生化|肠道发酵     

试论山区林业发展在生态省建设中的作用

从山区林业生产实践出发,阐述了山区林业在生态省建设中的地位和作用,分析了山区林业可持续发展的制约因素,提出了抓山区林业可持续发展,促生态省建设的对策.     

基于GIS技术的三明市森林资源动态规律研究

以森林经理学为理论基础,以地理信息系统作为系统管理平台,以三明市森林资源调查数据、数字地图为信息来源,借助相关数学分析方法,对森林资源1996—2005年期间的动态规律进行研究。结果表明:三明市林业用地面积基本保持稳中有升格局;森林覆盖率虽有起伏,但基本稳定在76.8%的较高水平上;人工林的面积呈增长趋势;天然林面积逐年减少;活立木蓄积量1996年后呈持续上升趋势。该项目研究为制定三明市林业的可持续发展方针提供科学决策依据,对于进一步促使森林资源管理信息化有一定的技术基础和应用价值。     

Microstructure and Properties of the Dacromet Coating for 20 Steel

The Dacromet technology,which is a potential surface treatment method,has achieved extensive application in automobile industry.The Dacromet coating is prepared through dipping & curing process,and the microstructure and anticorrosion performance of zinc,aluminum galvanized specimens are comparatively investigated.The results shows that the zinc,aluminum,chromium distributed evenly and Zn/Al flakes overlapped and embedded in amorphous chromium binder in Dacromet coating which anticorrosion is superior to hot dip galvanized but slightly inferior to hot dip aluminum coating with lowered adhesion,its adhesive ability to matrix is weaker than that of aluminum coating.     

Data Storage Technology of Furniture Product

This paper introduces the storage technology of ADO. Then the authors take the Furniture Computer Aided Design Software 3.0(FCADS3.0) as an example, and analyzes the design course and the data storage technology of furniture product. Then anew method is presented for data storage technology of furniture product. Thisa kind of way makes it true that data are saved during the products are being designed. Furthermore, it provides the technology support for design and manufacture of furniture and others. The experimental results testify that the approach is feasible.     

Memory Accessing Mechanism of X86 Computer System In Protected Mode

Protecting mode is on importmant working method of X86_based computer system,which provides the hardware support for multi_task and multi_process operation system on X86 platform. During the low_level development of X86_based computer system,it is very important to understand the working method of memory that is a main part of computer system. This paper discusses the data structure and hardware component of X86_based computer system which support the two mechanism of accessing memory:segmenting and paging,as well as the process of converting logical address to linear address and mapping virtual address to physical address. Througn segmenting and paging mechanism,we can realize the independent address space for every process in multi_process system,as well as the measure for protecting the system memory which can prevent the system breakup caused by illegal memory access.     

圆环病毒攻击下日粮中生物素的添加水平及其对仔猪部分免疫指标及生产性能的影响

本试验旨在确定猪圆环病毒2型(PCV2)攻击下,玉米-豆粕型日粮中生物素的适宜添加水平及其对仔猪部分免疫指标及生产性能的影响.将28日龄断奶、PCV2抗体检测阴性的(杜×长×大)三元杂交仔猪54头,平均分成6个处理,每个处理9个重复,每个重复1头猪.试验第1天试验猪全部口鼻接种PCV2,分别饲喂添加了0、0.10、0.20、0.30、0.40和0.50 mg/kg生物素的日粮,试验期35 d.结果显示:(1)添加0.50 mg/kg生物素时,仔猪35 d的日增重、料重比显著高于0 mg/kg生物素添加组(P<0.05);(2)日粮中添加0.30～0.50 mg/kg生物素,试验第21天和第35天,仔猪血清IgG水平显著高于0～0.20 mg/kg添加组(P<0.05);(3)添加0.30 mg/kg生物素,可以提高试验后期仔猪血清IFN-γ水平;(4)35 d日增重、料重比,以及接种后21和35 d仔猪血清IgG水平与生物素添加量分别呈2次及3次曲线回归.由结果得出,PCV2攻击下,日粮中添加0.30～0.50 mg/kg的生物素,对提高仔猪生产性能,提高IgG及后期IFN-γ水平有良好效果.