外源GA3对小黑麦籽粒灌浆特性及产量的影响

小黑麦籽粒不饱满是制约其应用开发的主要因素。为了解决这个问题,本试验以小黑麦东农8809和东农95-6654为试验材料,研究外源赤霉素(GA3)作用下小黑麦籽粒干物质、灌浆速率及产量的变化,并探讨开花期喷洒外源赤霉素对小黑麦籽粒灌浆特性及产量的影响。结果表明,开花期适量赤霉素处理能提高小黑麦籽粒灌浆速率,加速籽粒灌浆进程,促进干物质向籽粒中运转,进而提高粒重及产量。20 mg·L-1赤霉素喷施调控效果最好。     

Preparation and characterization of iptycene polymer/SWCNT nanocomposites

To enhance the strength while retaining the ductility of triptycene polyester, triptycene polyester/SWCNT nanocomposites were prepared. First, two different types of triptycene polyesters containing triptycenes that differ in size were synthesized and their mechanical and thermal characteristics were studied. Thermal analysis showed that the polyester containing the larger triptycene posed as a bigger hindrance factor to polymer chain-packing, resulting in lower crystallinity. Although the presence of triptycene interfered the packing of polymer chains, the increased size and amount of triptycene enhanced the thermal stability of the polymer. For the smaller sized triptycene-polyester/SWCNT composites, higher SWCNT content increased the stiffness and strength of the composite, but at the expense of the ductility. The increase in SWCNT content in the larger-sized triptycene polyester/SWCNT composites somewhat decreased the stiffness as well as the ductility of the polymer.     

大豆叶片可溶性糖代谢动态变化与相关酶活性的研究

选用6个大豆品种,研究了大豆叶片可溶性糖代谢的动态变化,并检测了相关代谢酶的活性,结果表明:不同大豆品种叶片可溶性糖含量变化规律较为一致,呈单峰曲线变化,峰值出现在开花期,秣食豆叶片可溶性糖含量显著高于栽培大豆,栽培大豆间没有表现出明显的差异性。蔗糖合成酶分解方向的活性显著大于合成方向的酶活性,说明在大豆蔗糖合成酶代谢中分解方向是主要的,蔗糖合成酶分解方向与叶片蔗糖含量间具有负相关性,其中绥农14达到了极显著负相关水平。蔗糖磷酸合成酶与蔗糖含量间表现为正相关性,其中丰收10达到显著正相关水平,蔗糖磷酸合成酶催化蔗糖合成的过程是不可逆的,说明在大豆叶片中蔗糖磷酸合成酶是合成蔗糖的关键控制性酶。     

基于数值模拟的湖北省风能资源储量估算

选择2006年作为湖北省区域风能资源代表年,利用中尺度气象模式MM5和小尺度诊断模式CALMET组成的风能资源评估模式系统,模拟了代表年湖北省1 km水平分辨率下各高度层的风向风速,并以此为基础分析得到各风能资源参数,利用湖北省4座测风塔实测资料对模拟结果进行验证。给出了湖北省风能资源分布图,并对风能资源丰富地区进行了分区。结合GIS技术估算出湖北省50 m高度层风功率密度≥250 w/m2的面积为1 664.16 km2,风能资源储量为332.8万kW。最后给出了湖北省风能资源开发利用的建议。     

我国大型活动中有机食品供给现状及前景分析

对我国大型国际性活动中有机食品的供给现状和消费前景进行了分析,为我国有机食品产业的发展提供了全新的发展思路和理论参考。     

硒对花椰菜幼苗叶绿素、脯氨酸及丙二醛含量的影响

应用土培盆栽方式,研究了不同土壤硒浓度对花椰菜幼苗期叶绿素、脯氨酸和丙二醛含量的影响。结果表明:在补硒浓度0～24mg·kg-1范围内,叶绿素含量随着土壤硒浓度的升高而增加;在补硒浓度0～32mg·kg-1内,脯氨酸含量随土壤硒含量的升高而增加;在补硒浓度为16～32mg·kg-1时,可明显降低丙二醛的含量,大于32mg·kg-1后,其含量显著升高。     

香菇中7种微量元素含量的调查与分析

 采用电感耦合等离子体质谱仪(ICP MS)法测定了浙江省10个县(市、区)香菇中Cu,Fe,Zn,Cr,Ni,Se和Mn等7种微量元素的含量,并进行统计分析,7种元素含量均符合正态或对数正态分布。其背景值分别是Zn 86029 mg·kg-1, Fe 53845 mg·kg-1,Mn 22159 mg·kg-1,Cu 10912 mg·kg-1, Se 00473 mg·kg-1, Cr 00056 mg·kg-1,Ni 0 mg·kg-1。结果表明: 7种微量元素含量存在区域差异和总体正相关性;与一般蔬菜相比,Zn含量是其3～5倍,Cu含量是其1～2倍,Mn和Se含量相当;Ni和Cr的含量远低于国家食品安全标准。     

不同时期追施氯化钾对莴笋产量和品质的影响

为了研究不同时期追施氯化钾对莴笋产量和品质的影响,为生产高产优质叶菜提供科学依据,采用田间小区试验研究不同时期追施氯化钾对莴笋产量和品质的影响。结果表明,不同时期追施钾肥均较基施钾肥(CK2)处理降低莴笋产量,随着莴笋生长时期的变化追施钾肥,莴笋产量逐渐降低,且随追施钾肥时期后移莴笋产量降幅逐渐增大。不同时期追施钾肥对莴笋叶维生素C和氨基酸含量影响表现不一。莴笋可溶性糖含量以基施钾肥(CK2)处理最高。而不同时期追施氯化钾可降低莴笋硝酸盐含量,系氯抑制土壤NO3--N的形成和根系吸收。不同时期追施钾肥对莴笋叶全氮含量影响不大,莴笋茎全氮含量以基施钾肥(CK2)处理最高;莴笋叶和茎全磷和全钾含量均以基施钾肥(CK2)处理最高,基施氯化钾有利于提高莴笋全氮、磷、钾含量。莴笋全氯含量随莴笋生长时期追施钾肥后移而升高。     

Chitosan: An Update on Potential Biomedical and Pharmaceutical Applications

Chitosan is a natural polycationic linear polysaccharide derived from chitin. The low solubility of chitosan in neutral and alkaline solution limits its application. Nevertheless, chemical modification into composites or hydrogels brings to it new functional properties for different applications. Chitosans are recognized as versatile biomaterials because of their non-toxicity, low allergenicity, biocompatibility and biodegradability. This review presents the recent research, trends and prospects in chitosan. Some special pharmaceutical and biomedical applications are also highlighted.     

Marine Peptides: Bioactivities and Applications

Peptides are important bioactive natural products which are present in many marine species. These marine peptides have high potential nutraceutical and medicinal values because of their broad spectra of bioactivities. Their antimicrobial, antiviral, antitumor, antioxidative, cardioprotective (antihypertensive, antiatherosclerotic and anticoagulant), immunomodulatory, analgesic, anxiolytic anti-diabetic, appetite suppressing and neuroprotective activities have attracted the attention of the pharmaceutical industry, which attempts to design them for use in the treatment or prevention of various diseases. Some marine peptides or their derivatives have high commercial values and had reached the pharmaceutical and nutraceutical markets. A large number of them are already in different phases of the clinical and preclinical pipeline. This review highlights the recent research in marine peptides and the trends and prospects for the future, with special emphasis on nutraceutical and pharmaceutical development into marketed products.