帽儿山虚拟林相的构建

应用帽称山林场1999年的遥感调查结果建立了DEM（Digital Elevation Model）、优势树种的分布图以及虚拟林相。其目的在于建立一种信息载体，将森林资源信息更形象、直观、动态地反映给使用者，使其既有亲临其境的感觉又能方便、快捷地查询各种信息。帽儿山虚拟林相建立的结果表明，森林资源信息也可以在微型计算机上表达和处理。     

关于兔科中亚科划分的若干建议

兔形目(Lagomorpha)按传统分类习惯被划分为兔类(Harcs)、穴兔类(Rabbits)和鼠兔类(Pikas)三大类群,已得到国际公认。但是,兔类实际上仅是一个属——兔属(Lepus)。按过去的分类系统,划归在兔亚科(Lcporinae)中,丝毫体现不出兔类在兔形目中作为三大类群之一的分类地位。然而,若结合生态与形态一并研究,则发现兔类与穴兔类初生的幼兔形态与生态明显有异:兔类终生在地面生活,初生的幼兔全身具毛,眼睁开,不久便能走路;为避天敌,需迅速奔跑,后腿变长,而奔跑中需氧多,后鼻孔变宽(翼内窝的宽度大)。穴兔类产仔在地下洞穴中,初生幼兔没毛,闭着眼,不会走动;避天敌主要靠迅速钻洞,奔跑慢,后鼻孔窄。它们生态与形态差异如此之大,在相似性大,而差异性小的野兔来说,应作为演化中新变所产生的新征。兔属可独立成亚科,称兔亚科为宜。穴兔类中,古兔亚科(Palacolaginae)自成独立亚科;其余的穴兔类应另立一新亚科,为穴兔亚科(Rabbitinae, nom. nov.)。     

玉米不同基因型的抗旱性鉴定及遗传分析

研究结果表明,武105的抗旱性最强;水分胁迫对植物产量性状、形态发育指标及生理性状的影响随着基因型及胁迫强度的不同而不同,单株籽粒产量对水分亏缺的反应最为敏感;抗旱系数、Eberhat-Russell稳定性参数(bi)及变异系数均能对供试材料的抗旱性做出客观地评价;从直观指标看,叶片窄长,雌雄发育协调,植棘体内水分含量及叶绿素含量高的基因型较抗旱;抗旱自交系在缺水条件下,一般配合力效应有所堤高,不抗旱自交系有所下降;抗旱自交系抗旱系数的一般配合力效应高,严重水分胁迫条件下抗旱系数的遗传主要受加性效应控制;控制产量与控制抗旱性的基因或基因系列不同,二者可独立进行选择.     

河西冷凉山区甜菜制种高产栽培技术

根据笔者多年来在武威市中部冷凉山区进行甜菜制种的实践经验 ,从选择地块 ,整地施肥 ,适时栽植、合理密植 ,提高覆膜质量 ,查苗放苗 ,打主薹 ,花序摘尖 ,人工辅助授粉 ,根外追肥 ,适时灌溉 ,适期收获 ,脱粒、晾晒等方面介绍了甜菜制种高产栽培技术     

天然松树脂的研究进展

 松树脂被广泛用于医药、香料等领域。我国早在20世纪50年代就已成为世界首要松香生产国之一。综述报道了世界上各种松树脂的组成、结构及用途。     

7种淡水鱼肌肉和内脏脂肪酸组成的分析

对鲢鱼（Hypephthalmichtys molitrix)、鲤鱼（Cyprinus carpio)、草鱼（Ctenopharyngodon idellus)、青鱼（Mylopharyngodon piceus)、鲫鱼（Carassius cuvieri)、黑鱼（Channa striata)和鳊鱼（Megalobrama amblycephale)7种淡水鱼肌肉和内脏中脂肪酸的组成进行了分析，结果表明，鲢鱼肌肉和内脏中脂肪酸组成与其他淡水鱼相比有较大差异。鲢鱼肌肉和内脏中含有较高的EPA（icosapentaenoic acid：二十碳五烯酸）和DHA（docosahexaenoci acid:二十二碳六烯酸），多不饱和脂肪酸的比例达到了54％以上，其中n-3(ω－3）与n-6（ω－6）脂肪酸的比值分别为1．7（内脏）和1．9（肌肉），而其他内种淡水鱼的EPA和DHA含量较低。     

Suppressive effect of the ethanolic extract of adlay bran on cytochrome P-450 enzymes in rat liver and lungs

Adlay ( Coix lachryma-jobi L. var. ma-yuen Stapf) is a grass crop and is reported to protect against various diseases such as cancer. To investigate the effect of the ethanolic extract of adlay bran (ABE) on drug-metabolizing enzymes and glutathione-related antioxidant enzymes in rats, three groups of eight male Sprague-Dawley rats each were fed a control diet or a diet containing 5 or 10% ABE for 4 weeks. Significant decreases in microsomal cytochrome P-450 (CYP) 1A1-catalyzed ethoxyresorufin O-deethylation, CYP2C-catalyzed diclofenac 4-hydroxylation, CYP2D-catalyzed dextromethorphan O-demethylation, and CYP3A-catalyzed testosterone 6β-hydroxylation in the liver and CYP1A1-catalyzed ethoxyresorufin O-deethylation in the lungs of rats fed ABE were observed. Immunoblot analyses also showed decreases of CYP1A1, 1A2, 2C6, 2C11, 2D1, 2E1, 3A1, and 3A2 in the liver and CYP1A1 in the lungs. Furthermore, rats fed the 10% ABE diet had a higher glutathione content and glutathione peroxidase, glutathione reductase, and glutathione S-transferase activities in the lungs, but such an increase was not noted in the liver. Inhibition of various CYP-catalyzed enzyme reactions by ABE in rat and human liver microsomes had also been shown. The results of this study indicate that ABE feeding may suppress CYP enzyme activities and CYP protein expression in the liver and lungs of rats. Moreover, the increase of the antioxidant potential by ABE is tissue-specific.     

Sinapine detection in radish taproot using surface desorption atmospheric pressure chemical ionization mass spectrometry

Plant research and natural product detection are of sustainable interests. Benefited by direct detection with no sample preparation, sinapine, a bioactive chemical usually found in various seeds of Brassica plants, has been unambiguously detected in radish taproot (Raphanus sativus) tissue using a liquid-assisted surface desorption atmospheric pressure chemical ionization mass spectrometry (DAPCI-MS). A methanol aqueous solution (1:1) was nebulized by a nitrogen sheath gas toward the corona discharge, resulting in charged ambient small droplets, which affected the radish tissue for desorption/ionization of analytes on the tissue surface. Thus, sinapine was directly detected and identified by tandem DAPCI-MS experiments without sample pretreatment. The typical relative standard deviation (RSD) of this method for sinapine detection was 5-8% for six measurements (S/N=3). The dynamic response range was 10(-12)-10(-7) g/cm2 for sinapine on the radish skin surface. The discovery of sinapine in radish taproot was validated by using HPLC-UV methods. The data demonstrated that DAPCI assisted by solvent enhanced the overall efficiency of the desorption/ionization process, enabling sensitive detection of bioactive compounds in plant tissue.     

高压气动比例减压阀设计与仿真

提出一种高压气动比例减压阀,该阀由比例电磁铁控制的二位三通型滑阀式先导阀和活塞提升式主阀组成,通过压力传感器和控制器构成闭环电反馈控制,最高工作压力为31.5 MPa。该阀虽然存在少量先导耗气,但保证了压力调整的快速性和稳定性,克服了先导泄漏对减压阀的影响,避免了先导阀意外结冰的发生。在介绍结构及工作原理的基础上分析了该减压阀的特点,利用AMESim建立了考虑气源压力和负载流量波动的仿真模型。仿真结果表明:该阀在气源压力缓慢下降且负载流量大范围波动的情况下能实现稳定的压力输出,在不改变控制参数的前提下,当气源压力为31.5 MPa时输出压力可在1~30 MPa范围内稳定;先导阀预开口形式对压力精度影响较小,但应避免正开口以减少气体浪费;先导阀环形间隙高度控制在10μm左右较为合适。     

鸡粪厌氧发酵沼液混凝处理投药量预测

对某养鸡场沼气工程全混式发酵罐出水沼液混凝投药量预测模型进行了研究.采用回归分析法确定了混凝剂最优投加量的模型参数;通过回归正交试验研究了助凝剂最优投加量影响因素,建立了助凝剂最优投加量预测模型;通过中试试验,对所得投药量模型进行了验证.结果表明,混凝处理沼液混凝剂最优投加量模型为A=0.000 06C1.41;助凝剂最优投加量模型为B=0.000 148CN -0.014 2C -0.277N+ 26.7,原水CODcr及搅拌强度是影响助凝剂PAM投加量的重要因素;经统计检验及中试试验验证,表明所建预测模型准确可靠.