施肥对不同品种麦田CO2通量的影响

为探讨施肥对小麦田间CO2释放量的影响,本研究设计以4个不同施肥水平为主处理,以3个不同年代的主栽品种碧玛1号、烟农15号、山农11号为研究对象,采用封闭式静态暗箱技术,应用LI-6400型便携式光合仪(美国)在作物生长期测定土壤CO2释放量和光合速率。同时测定了环境影响因素土壤温度和水分等。研究结果表明,施肥有利于增加土壤CO2释放量,且中氮处理水平释放量最多;土壤温度和水分对土壤CO2释放量有一定的影响,土温越高,水分越大,CO2释放越多;麦田CO2交换量与小麦根系活性呈正相关。     

植物开花光周期反应的分子调控机制

植物开花时间受到日照长短季节性变化的调节,拟南芥和水稻中与光周期反应相关基因的分离,使人们得以认识植物开花光周期反应的分子调控机制。植物感知日照长短的变化主要由CONSTANS(CO)基因的表达所控制。CO能够将光信号与生物钟信号整合,调节开花基因FLOWERING LOCUS T(FT)的表达,并最终控制植物的开花时间。本文对这一研究的最新进展进行了综述。     

不同水分,温度条件下CO2浓度对大米品质的影响

试验选用当年新收获的稻谷加工成的水分为１３．９％、１４．７％和１６．０％的大米，在２３℃和３３℃的恒温室中，将７种不同浓度的ＣＯ２经减压调湿后通入粮堆。定期取样，测定大米的脂肪酸、水溶酸、还原糖、非还原糖、粘度和过氧化物酶活性的变化。试验结果表明：１３．９％水分的大米在２３℃下储藏，各种浓度ＣＯ２对大部分品质指标影响不显著，ＣＯ２的保质作用不明显；１４．７％水分的大米在２３℃储藏，ＣＯ２对个别品质     

Antioxidant,anti-amylase and anti-glycation potential of brans of some Sri Lankan traditional and improved rice (Oryza sativa L.) varieties

Brans of 23 traditional and 12 improved (both red and white) rice varieties in Sri Lanka were screened for anti-amylase and anti-glycation activities in vitro. Varieties which showed the highest inhibitory activities at screening were further investigated for anti-glucosidase and glycation reversing as anti-diabetic properties. The same varieties were studied for selected antioxidant properties. Significantly high anti-amylase and anti-glycation activities were observed for bran extracts of red varieties compared to white varieties at screening. Traditional red rice varieties, Masuran, Sudu Heeneti, Dik Wee and Goda Heeneti, exhibited significant and dose dependent anti-amylase, anti-glycation and glycation reversing activities. These varieties also showed marked antioxidant properties. It is concluded that brans of Sri Lankan traditional red rice varieties Masuran, Sudu Heeneti, Dik Wee and Goda Heeneti may be potential food supplements for diabetes.     

rep-PCR法对稻瘟病菌有性后代随机群体的评价

构建稻瘟病菌有性后代随机群体是研究目的基因遗传特点，乃至克隆目的基因的重要基础，但是在建立有性后代随机群体时，可能会有无性后代污染。采用先分离单个子囊，待其长成菌落并产生分生孢子后，再分离单个萌发的分生孢子的方法构建稻瘟病菌有性后代随机群体。利用基于重复DNA序列Pot2的rep-PCR方法对分离得到的有性后代进行DNA指纹分析，并评价构建的稻瘟病菌有性后代群体的质量。结果表明，构建的有性后代随机群体共包含176个后代。每个后代个体的DNA指纹图谱均与两亲本的DNA指纹图谱不一致；有性后代之间的DNA指纹图谱也彼此不一样，说明得到的有性后代个体都是由子囊孢子萌发形成的，且分离自不同的子囊。GUY11的rep-PCR扩增片段中的5个特异性片段的分离比例也都符合1:1的期望值，是按单个位点标记分离的，与已知的结果相吻合，说明有性后代随机群体的质量较高，不存在偏离现象，是一个较为理想的群体。同时，研究结果还得出基于Pot2的rep-PCR方法可以用来快速评价稻瘟病菌有性后代群体的质量。     

Performance Analysis of MIPv4 Regional Registration Combined with Low Latency Handoffs

The mechanism of MIPv4 regional registration and the low latency handoff protocols are introduced. Ways and procedure of pre-registration handoff and post-registration handoff are discussed also. The authors analyze the performance of the low latency handoff protocols combined with low latency handoffs over a wireless access based on IEEE 802. 11 standard in a tree-like network topology. The performance of pre-registration and post-registration scheme is given by simulation.     

Effect of H2O2 in the Bioremediation of Petroleum Hydrocarbon Pollutant

The high efficient strain was separated and filtrated from the soil contaminated by petroleum hydrocarbon. The authors, we focus on the effect of H2 O2 in the bioremediation of petroleum hydrocarbon pollutant. The results show that the optimal concentration of H2O2was 200 mg/L at one time. At the lag phase of the strain, H2O2 was added in per eight hour, and at logarithmic phase, H2O2 was added in per two hour. Biodegradation rate of petroleum hydrocarbon was increased from 38. 1% to 83. 1%. The bioremediation of petroleum hydrocarbon pollutant is remarkably by double effects of deep oxidation and oxygen supply of H2O2.     

Pinning Theory of Fermi Energy and Surface State Measurement of ZnSnO3 Gas Sensitive Material

In order to research the state of energy bands and gain and loss of electrons on the surface of ZnSnO_(3),it is put forward that Pinning theory of Fermi energy is applied to development of gas sensitive materials.The relative position between surface state and conduction band on surface of zinc tin complex oxide(ZnSnO_(3)) gas sensitive material has been investigated by utilizing oxidation redox couple,FeCl_(2)/ FeCl_(3),which have high surface state.Fermi energy is pinned at about 0.2 eV below conduction band E_(cs)on the surface of ZnSnO_(3).It has been determined that additives doping ratio,addition concentration and working atmosphere have no effect on this value.Therefore,pinning theory of Fermi energy has been verified by using this method.