猴头菌不同生长发育期粗蛋白、粗多糖含量及水溶性粗多糖体外免疫活性

测定猴头菌(Hericium erinaceus)华中猴头菌株不同生长发育期子实体中的粗蛋白、粗多糖和水溶性粗多糖中β-葡聚糖含量,并研究不同生长发育期子实体粗多糖体外刺激巨噬细胞产生NO的活性变化规律.结果表明,供试菌株不同生长发育期子实体的粗蛋白、粗多糖和β-葡聚糖含量以及粗多糖体外刺激巨噬细胞产生NO的活性均存在显著或极显著差异,随着生长发育的进行,猴头菌子实体中粗蛋白含量总体上呈下降的趋势(小菌剌期比前一时期有所增加),而多糖含量则总体呈上升趋势(小菌刺期比后一时期高),β-葡聚糖含量呈先快速上升后平稳的趋势;分裂期粗多糖在浓度500 μg/mL时对RAW264.7释放NO的促进作用较强.     

共建海淀农业图书馆积极为"三农"服务

介绍了中国农业大学和海淀区政府共同创建的海淀农业图书馆及创造一年多来为“三农”服务所作的贡献。     

制浆生物技术的研究与工业应用

综述了制浆工业中生物技术研究的发展简史，务类酶制剂在制浆工业中的研究与应用概况，着重介绍了当前制浆生物技术研究热点这一的木聚糖酶的研究与应用。同时简介了制浆生物技术的研究进展。     

杨木材性对单板胶合的影响及胶合工艺

本文以组坯结构,涂胶量和热压条件等为单板胶合的相关因子进行６种杨木单板胶合的正交试验,研究了胶合工艺的适应性和较优的工艺条件。结果表明：由于选用的杨树组系,产地等不同,树种间的材性差异较大,所以难以找出一个通用的胶合工艺条件;在所试验的６个品系杨树中大部分以采用热压单位压力０．５￣０．８ＭＰａ,热压时间４０ｓ／ｍｍ、涂胶量２８０￣３４０ｇ／ｍ＾２,脲醛胶填料（面粉）加量１５份的调胶配比及等厚单板组     

DIFFERENTIAL RESPONSES OF YIELD AND SELECTED NUTRITIONAL COMPOSITIONS TO DROUGHT STRESS IN SUMMER MAIZE GRAINS

Water is a key factor influencing the yield and quality of crops. Thus, a field simulative study was carried out from 2002 to 2003 in order to assess yield and nutritional composition changes in maize (Zea mays L.) grains at three different soil moisture levels: full-watered (FW), moderately stressed (MS), and severely stressed (SS). Our data indicated that SS treatment significantly increased nitrogen (N), calcium (Ca), magnesium (Mg), copper (Cu), and zinc (Zn) contents in maize grains by 11.9%, 27.8%, 11.1%, 18.4%, and 32.9%, respectively, when compared to FW. However, significant decreases (P < 0.05) in starch, phosphorus (P), and potassium (K) contents and yields in maize grains, about 27.9%, 16.5%, 16.7%, and 375.2%, respectively, were seen at SS treatment as compared to those in the FW treatment. In contrast, crude fat content had a different pattern in response to drought stress as compared to most nutritional compositions in maize grains. It generally followed the series MS > FW > SS. These results suggested that although some nutritional compositions in maize grains were positively affected by drought stress, the yields decreased significantly.     

水力自动溢流堰在自动调控渠系中的应用

分析了渠系自动化的发展现状，介绍了水力自动溢流堰及其恒定水位的工作原理，并根据该装置良好的恒定水位性能，研究其在渠系自动化流量调控的应用条件和实现方法，其中对在取水口处应用和渠道中的联合运用两种方法作了进一步探讨。在渠道自动化上游控制中，能有条件地取代常用的水力自动闸门，可以实现真正恒定水位的目的，使得渠系自动调控方法简便，精度高。     

黑龙江省小麦育种状况分析及研发对策

“七五”至“十五”期间（1986~2005年）黑龙江省共审定推广了90个小麦新品种,其中中熟和晚熟品种占到64.4%。单产由1986年的1808kg/hm2提高到2005年的3167 kg/hm2,单产提高1.75倍。产量增加的主要原因是千粒重增加;品质也有不同程度的改进,主要表现在沉降值提高上。在小麦育种上采用了新技术,并取得了很好的育种效果。育种品种数量虽多,但突破性品种较少。根据存在问题,提出了4条研发建议。     

不同稳定剂对樱桃番茄果汁稳定性的影响

为了减少樱桃番茄果汁在加工贮藏过程中的分层现象,提高其稳定性,改善其品质,达到使樱桃番茄果汁长期稳定的目的,采用单因素试验和正交试验研究了琼脂、海藻酸钠、卡拉胶、食用明胶、羧甲基纤维素钠(CMC-Na)、黄原胶等6种常见的稳定剂对樱桃番茄果汁的稳定效果。结果表明,单一稳定剂对樱桃番茄果汁的稳定效果依次是:黄原胶琼脂CMC-Na海藻酸钠卡拉胶食用明胶;正交试验结果表明,0.03%的黄原胶,0.03%的琼脂,0.1%的CMC-Na组成的复合稳定剂对樱桃番茄果汁的稳定性最好。使用该复合稳定剂生产的樱桃番茄果汁,黏度适当、果肉颗粒分散均匀、口感协调,具有较高的稳定性。     

Influence of calcined alum on the hydration and hardening performance of anhydrite

The influence of calcined alum on the hydration process, the structure and intensity of hardened anhydrite, the degree of solution supersaturation, and other properties are investigated by determining setting time, hydration rate and hydration temperature increases in combination with analyzing the microstructure and intensity of hardened paste. The alum action mechanism also is revealed. The results indicate that calcined alum is a highly active excitant for anhydrite. Calcined alum can reduce setting time, increase the hydration process and intensity of anhydrite, and refine crystals. Calcined alum improves the hydration and solution performance of anhydrite and sulfate radical concentration. This subsequently raises the degree of dihydrate gypsum supersaturation. Anhydrite hydration and solution, and the spontaneous homogeneous nucleation and growth of dihydrate gypsum crystals are all accelerated.     

滩涂土壤电磁感应仪与方差四叉树法采样布局研究

将电磁感应仪EM38和方差四叉树法VQT相结合,以EM38测量的土壤表观电导率作为土壤盐分的辅助变量,以表观电导率的空间分布为先验信息,利用VQT法对苏北滩涂围垦地土壤盐分的优化采样布局进行了设计、验证与精度评价。结果表明,VQT法设计的采样方案经Kriging插值形成的空间分布图与原始图件极其相似,但两者的样点数目相差近1/2。相同的样本数目,VQT法获取的空间分布图与原始图件的相似度高于网格采样法;同样的成图精度,VQT法需要的样本数量小于网格采样法;在允许最大偏差指数为10%的条件下,VQT法采样效率比网格法提高17.3%。该方法具有可根据局部部位变异大小进行密集或稀疏采样的优势,EM38和VQT法的结合运用为滩涂区降低采样成本、提高采样效率提供了有效手段与理论依据。