对二氯苯对湿地土壤细菌群落多样性的影响     

徐文品  丁成  杨春生  朱光灿  杨唐仪 《湖北农业科学》2012,51(18):4134-4137

利用聚合酶链式反应-变性梯度凝胶电泳(PCR-DGGE)考查了对二氯苯胁迫对湿地土壤细菌群落多样性的影响.通过不同培养时间(4、18和45 d)和不同培养浓度(120、240、360和600 mg/kg)对二氯苯污染下湿地土壤细菌群落基因组的变性梯度凝胶电泳(DGGE)多样性分析.结果表明,各处理下的土壤细菌群落多样性在不同处理时间有明显差异.培养初期对二氯苯对土壤细菌群落抑制作用非常显著,土壤细菌中某些群落的生长受到抑制;不同处理在处理后期差异很小.在土壤培养初期,含对二氯苯240mg/kg的培养基上出现一条新增条带,为对照和低浓度对二氯苯土壤所没有,说明土壤中存在对二氯苯生长优势菌.  相似文献   

滚杠式红枣分级机的试验方法     

贾首星  郑炫  马铖  张景  代亚猛 《现代农业科技》2012,(19):180+185

总结了测试红枣分级机性能的试验方法,以期为方便准确地测试红枣分级机的各项性能提供参考。  相似文献   

高职物业管理专业建设思考     

耿城 《信阳农业高等专科学校学报》2012,22(4)

随着建筑物科技含量的提高和居住理念变化,物业服务理念也不断更新,这一系列的变化对物业管理专业人才的培养提出了新的要求。  相似文献   

栽培基质对烟草育苗温室网纹甜瓜农艺性状及产质量的影响     

高仁吉  周诚  罗静  邹勇  柯油松  谢俊喜  陈建军  王维 《广东农业科学》2012,39(21):61-63

为解决我国烟草育苗温室闲置期较长而利用率较低的问题,进行了不同栽培基质对烟草育苗温室网纹甜瓜农艺性状及其产质量的影响研究。结果表明:烟草育苗基质∶红沙=2∶1(基质M)上的甜瓜植株长势好于香菇渣∶红沙=2∶1(基质N),基质M上的甜瓜果实结瓜位显著低于基质N,植株最大叶面积、干鲜重显著大于基质N;美灵甜瓜果实中可溶性固形物、蔗糖、总糖、可溶性蛋白均显著高于美琪,但美琪果肉厚度、单果重、座果率、均价及产值均显著高于美灵。综合分析认为,当前栽培条件下,南雄烟区烟草育苗温室大棚网纹甜瓜生产中宜采用甜瓜品种美琪,栽培基质选择烟草育苗基质∶红沙=2∶1。  相似文献   

云斑尖塘鳢遗传多样性的ISSR分析     

姚俊伟  许爱娱  潘淦  龙程 《广东农业科学》2012,39(22):169-172

利用简单序列重复区间(ISSR)分子标记技术,对广东广州和海南三亚2个地区云斑尖塘鳢群体的遗传多样性进行分析。采用加拿大哥伦比亚大学设计的ISSR引物,经过筛选后采用4条引物对云斑尖塘鳢的两个群体各12条进行ISSR分析,扩增出31个位点,两个群体的多态位点比例为83.87%,Shannon信息指数0.4591,群体间遗传距离为0.1350,遗传分化系数0.1493,基因流2.8499,说明云斑尖塘鳢群体间分化主要受到群体内部的变异的影响,而不是遗传漂变,广州地区的云斑尖塘鳢群体遗传多样性优于三亚群体。UPGMA聚类分析结果表明,云斑尖塘鳢没有群体间界限。  相似文献   

Removal Efficiency and Influence Factors of Bromide in Water by MIEX     

CHEN Wei  CAO Zhe  LIU Cheng  WANG Man 《保鲜与加工》2012,(3):133-137

Jar tests were used to study the removal efficiency and influence factors caused by common anions and organic compounds of bromide in water by a new magnetic ion exchange resin (MIEX). The results show that MIEX can remove bromide in pure water effectively. The removal rates of bromide by MIEX are all over 90% when the equilibrium time of ion exchange reaction between MIEX and bromide is 5 min and 3 min and the dosage is 10 mL/L and 20 mL/L, respectively. Even containing other common negatively charged matter which has inhibitory effect to some extent, the removal rates reach 50%. Anionic content and the selectivity of MIEX are the main influence factors to reduce bromide in water by MIEX. The existence of organic compounds decreases the removal rate of bromide in water by MIEX, which is approximately 70%. There are differences between anions and organic compounds in removal processes by MIEX. The equilibrium time of ion exchange reaction removing anions is about 5 min, while it takes over 20 min to remove organic compounds measured with UV 254 and DOC, respectively by MIEX with the dosage of 10 mL/L.  相似文献   

An Novel Assessment Tool for Evaluating Systematical Energy Consumption and Environmental Impact during Road Construction*     

Wang Hai  Chen Dezhen  Cheng Ling  Shi Huishen  Zheng Hang 《保鲜与加工》2012,(Z1):251-257

New software for quantifying the systematical energy consumption, resources consumption and waste disposal information in road construction has been set up and was named as SEE-at-GRC (Systematical energy and environmental assessment tool for Green road construction). With help of this tool, the quantified contributions of recycling waste materials or modified materials in road construction as well as process improvement etc. on environmental impact can be evaluated by showing savings on energy consumption and resource consumption quantitatively; at the same time waste disposal capacity and environmental impacts were also provided. Two examples were given to shown the output of the software. Those results are useful for guiding the utilization of recycled waste materials, as well as for developing new technology process and advanced materials in road construction. Based on Visual Basic (VB) language and MSSQL database, SEE-at-GRC has provided a full set of evaluation methodology on energy saving, emission reduction and process optimization for guiding green road construction developing.  相似文献   

Design of wireless inductive power receiver circuit in artificial subretinal chip     

WANG Xing  PENG Cheng Lin  LIU Tao  WANG Rui  LI Ru Zhang  ZHENG Xiao Lin  HOU Wen sheng 《保鲜与加工》2012,(4):40-45

A scheme of inductive wireless receiver circuit is put forward, according to special requirement of inductive wireless power supply in artificial subretinal prosthesis circuit. The proposed receiver circuit can be divided into CMOS rectifier, regulator and self-biasing circuit. The CMOS rectifier is used to provide power supply for regulator and self-biasing circuit. The self-biasing circuit furnishes the regulator with bias voltage and bias current which is independent from power supply. The proposed receiver circuit is designed by Cadence tool and Chartered 0.35 μm CMOS device model, and oscillator in artificial subretinal chip is used as the proposed receiver circuit’s load. The results show that the proposed receiver circuit can provide load capacity of 3.3 V and >1 mA,with a layout size of 62 μm×195 μm.  相似文献   

QRS complexes detection using quadratic b-spline wavelet transform algorithm     

ZHANG Si jie  WANG Zhen xing  ZHANG Jian  ZENG Xiao ping  PENG Cheng ling  GUO Xing ming 《保鲜与加工》2012,(4):88-93

Aiming at the low accuracy and low adaptability of wave detection, a QRS complexes detection algorithm is proposed based on quadratic b-spline wavelet, while combined with binary search algorithm and arc approximating curve algorithm. The signal is decomposed with quadratic b-spline wavelet through Mallat algorithm and the R wave is detected by adjusting the threshold with binary search and modulus maximumizing. The T wave and P wave are detected by using arc approximating curve algorithm based on the least square. This algorithm is certified with the ECG signals from MIT-BIH database and is demonstrated that the algorithm enhanced the adaptability of R wave detection and improved the accuracy of T wave and P wave detection. The simulation experiment shows that the improved algorithm can effectively improve the automatic detection capabilities of ECG signals.  相似文献   

氨基酸肥料对大豆叶片光合作用与产量的影响   总被引：11，自引：0，他引：11  

段春慧  申明  张治平  张诚  孙连城  阮书存  汪良驹 《南京农业大学学报》2012,35(4):15-20

以泗洪县和兴化市两地区主栽的大豆品种‘高丰1号’和‘大豆王’为材料,研究了喷施氨基酸肥料对植株叶片光合特性、农艺性状、产量与品质的影响。结果表明:喷施氨基酸肥料能够显著提高大豆叶片SPAD值、净光合速率(Pn)、PSⅡ反应中心最大量子效率(φPo)和捕获的激子将电子传递到QA-以远其他电子受体的概率(ψo),减少PSⅡ反应中心吸收光能用于热耗散的量子比率(φDo)。其中泗洪‘高丰1号’的φPo值增加9.5%,兴化‘大豆王’的ψo值增加23%。氨基酸肥料处理还显著增加产量,‘高丰1号’的百粒质量增加10%,单株产量增加39%,每m2产量增加64%;‘大豆王’的百粒质量增加8.6%,单株产量增加22.6%,每m2产量增加22%。并且,氨基酸肥料处理提高了豆粒维生素C、可溶性糖、游离氨基酸以及蛋白质含量。  相似文献