动物鲜味受体的研究进展及其基因表达调控

动物的鲜味受体包括代谢型谷氨酸受体(m GluR)和味觉受体异源二聚体(T1R1/T1R3),是C型G蛋白偶联受体,N末端捕蝇草模块(VFT)区域可与鲜味配体结合,识别鲜味。本文主要论述了鲜味受体的研究进展、鲜味识别转导机制及鲜味受体基因的表达调控等,以期为相关研究提供参考。     

木/竹基复合材料在机电产品包装的应用

我国机电产品的包装大量使用实木材料,面临着资源紧张和成本高昂等问题。通过分析机电产品包装材料的结构形式和承载要求,讨论重组木/竹复合材料在包装行业应用的可行性,从政策、成本和性能等方面,总结新型重组木/竹复合材料替代实木材料用于机电产品包装的优势及发展前景。     

水果黄瓜新品种京研迷你5 号的选育

京研迷你5 号为保护地水果黄瓜一代杂种。其母本为从欧洲水果黄瓜品种中经8 代自交选择
获得的高配合力自交系M118。父本为（日本黄瓜自交系J5× 欧洲迷你黄瓜自交系EU11）×EU11 经8 代
自交选择获得的高配合力自交系EUJ4。该品种生长势强，为全雌系。瓜长15～19 cm，单瓜质量90～110 g，
果面光滑，无刺瘤，品质好，产量高。耐低温弱光，耐热。抗霜霉病、白粉病等主要病害。长季节栽培每
667 m ² 产量可达9 600 kg。适于全国各地保护地种植。     

A comparison between X‐ray fluorescence and dissolution methods employing lithium metaborate fusion for elemental analysis of soil clays

Abstract

A method employing fusion of soil clay samples with lithium metaborate (1:5 ratio) in a furnace at 1050°C for 1 hr. subsequent dissolution of the fused sample in 4% HNO₃. and elemental analysis for Si, Al, Fe, Ca, Mg, K, and Ti by atomic absorption spectrometry was compared with the X‐ray fluorescence (XRF) fused disc technique for analysis. Duplicated analyses were performed on 15 clay samples from soils of the southern U.S and three API reference samples. The mean total percent recovery by this method was excellent (100.14 ± 2.85). Elemental oxide quantities in terms of SiO₂. Al₂O₃, Fe₂O₃, MgO, CaO and K₂O determined by atomic absorption/flame emission (AA/FE) spectroscopy were in good agreement with values measured by x‐ray fluorescence (XRF) on the same subsamples (r = 0.89^* to 0.98^**). but somewhat more variable on subsamples seperated from different pretreatments (r = 0.70^* to 0.97^** ). The method, which has also been tested on 36 additional clay samples from a variety of Kentucky soils with total percent recoveries ranging from 96.5 ‐ 103.5%. demonstrated no bias due to mineralogy with respect to mixed, montmorillonitic. and siliceous classes. This technique presents numerous advantages over other elemental analysis techniques utilizing fusion, dissolution, or XRF spectroscopy with respect to time, effort and cost. With the introduction of inductively‐coupled plasma (ICP) emission spectroscopy. efficiency can be additionally improved.     

Sulfur content of plant material: A comparison of methods of oxidation prior to determination

Abstract

Procedures for S determination involving digestion of plant material with HNO₃/HClO₄ mixtures gave lower values than those using oxygen flask combustion. Tests on a range of S compounds showed that the HNO₃/HClO₄ procedure underestimated S present in methionine, cysteine and glutathione but S in sulfate and the glucosinolate, sinigrin, was not underestimated.

Low recoveries using HNO₃/HClO₄ digestion procedures can be due both to incomplete oxidation of certain compounds and to gaseous losses during the vigorous boiling stage of digestion.     

一维Theta-神经元网络中细胞耦合作用时间对细胞放电行为的影响

通过对一维Theta-神经元网络中细胞耦合作用时间的讨论,得到较长时间的耦合作用时间会使网络中单放电行波变为多放电行波,并通过数值模拟对理论加以验证.     

西瓜新品种爱能5 号的选育

爱能5 号母本系湘蜜西瓜F₁ 自交12 代得到的稳定单系XM12，父本系西农8 号F1 自交10代得到的稳定单系XL10。植株生长势强，分枝力强，易坐果。果实椭圆形，果皮黑色，单瓜质量4 ～7kg，果皮厚1.1 cm 左右，瓤红色，肉质细脆，汁多味甜，中心可溶性固形物含量10% 左右。全生育期93d（天）左右，中熟，雌花开放～果实成熟约需32 d（天）。高抗枯萎病，抗疫病和炭疽病，适宜在湖南省及其周边地区种植。     

纳米CuI催化偶联反应合成二苯醚类农药中间体

二苯醚是一种重要的农药中间体,通过W/O微乳法,制备出形貌均一的球状纳米CuI,并应用于催化C-O交叉偶联反应中,在温和的反应条件下,合成了具有优良产率的二苯醚类化合物,该方法可在今后的农药合成中应用。     

基于CAD/CAM的型芯数控自动编程加工与研究

应用SolidWorks的曲面和实体设计的优势对汽车泵体上壳压铸模型芯进行设计;应用MasterCAM对汽车泵体上壳压铸模型芯进行数控自动编程与加工,比较、分析MasterCAM和SolidWorks设计功能的优越性,提高了复杂型芯的设计、制造及开发效率。