天然气计量系统的技术改造

真武天然气集中处理站采用CWD-430双波管差压式计量装置计量天然气流量,存在结构复杂、计量准确度低等问题。通过引进SWP流量积算仪及高级孔板阀,实施生产工艺技术改造,实现了流量、压力等参数的自动采集,天然气计量准确度符合生产与外输要求,提高了企业的自动化管理水平。     

Excel软件在罐容计量中的应用

利用罐容计量油品容量时,通常需要通过内插计算来求得对应的容积值,以确定罐中油品的体积量。使用Excel软件可以实现内插计算的自动化,即用Excel软件制作一个罐容计算表,并将罐容表值存入计算表中,只要输入油高即可得出对应的容积值,迅速而准确。     

坡耕地马铃薯套玉米不同种植模式的效益比较

采用大区比较法,在坡度27.左右的坡耕地上进行马铃薯套玉米不同种植模式的效益比较试验.结果表明:与顺坡聚垄种植相比,横坡聚垄配置地埂植物绿肥种植的马铃薯增产2 253.6 kg/hm2,玉米增产657.0 kg/hm2.马铃薯和玉米的复合产量增加2 910.6 kg/hm2,纯收入增加1 887.78元/hm2;而且,横坡聚垄配置地埂植物绿肥种植能有效减轻土壤水分和养分的流失,提高坡耕地产出率.     

马铃薯花药培养再生植株的诱导与鉴定

文章采用讷16、克新13、克新17、克新18、花525和波C共6个马铃薯品种为试验材料,研究了不同的基因型、不同浓度的植物生长调节剂和蔗糖对马铃薯花药培养的影响,并对马铃薯花药再生植株进行了细胞学、形态学和农艺性状的观察与鉴定。结果表明,基因型中波C和讷16具有较强的再生能力;MS+NAA0.5 mg.L-1+2,4-D0.5mg·L-1+KT0.5 mg·L-1适合愈伤组织的形成;分化培养基为MS+NAA0.2 mg·L-1+6-BA2.0 mg.L-1+ZT1.0 mg·L-1;蔗糖浓度为6%时愈伤组织的诱导率最高;移栽的双单倍体植株在生长势、叶色、薯型等性状与对照相比存在差异。     

水杨酸对甘薯抗薯瘟病和抗氧化酶系统的影响

研究不同水杨酸(SA)浓度对甘薯抗薯瘟病和抗氧化酶的诱导效果.结果表明:甘薯接种薯瘟菌前3 d喷施不同浓度SA,1-7 mmol.L-1SA均可诱导甘薯对薯瘟病的抗性,其最适浓度为5 mmol.L-1;SA提高叶片中抗氧化酶超氧化物歧化酶(SOD)和过氧化氢酶(CAT)活性,降低过氧化物酶(POD)活性和丙二醛(MDA)含量,使过氧化氢(H2O2)累积减少.可见在薯瘟病菌浸染下,SA能够降低膜脂过氧化作用,可诱导甘薯对薯瘟病产生抗性.     

橘小实蝇个体食量测定

橘小实蝇在有选择取食的情况下更倾向于倒挂取食,在无选择性取食的情况下位置对取食无影响(P>0.05).橘小实蝇对染料的排空试验结果表明,甲酚红和荧光素钠在4 h内即可到达后肠,通过染料J-管技术测得橘小实蝇取食量在2 h内就能达到最大,所以在测定橘小实蝇食量时饲喂时间以2 h为宜.染料J-管技术测定结果表明:3日龄和6日龄雌雄橘小实蝇2 h内个体食量分别为(4.0412±0.3348)、(3.4409±0.1132)、(5.6543±0.2852)、(4.6808±0.2654)g.     

连作对设施黄瓜产量和品质及土壤酶活性的影响

【目的】揭示黄瓜产生连作障碍的机理,为设施蔬菜的可持续发展和减轻连作障碍提供参考依据。【方法】在日光温室内进行田间试验,以露地玉米地土壤为对照,研究不同连作年限(4,5,8和12年)下黄瓜产量和品质及土壤酶活性的变化。【结果】随着黄瓜连作年限的增加,黄瓜产量、可溶性固形物和维生素C含量均下降,硝酸盐含量上升,土壤呼吸强度降低,土壤脲酶活性、蔗糖酶活性、碱性磷酸酶活性均呈先上升后降低的趋势;随着黄瓜生长季节的变化,土壤脲酶活性呈先上升后降低再升高的趋势,土壤蔗糖酶活性、碱性磷酸酶活性和土壤呼吸强度均呈先上升后降低的趋势。【结论】随着连作年限的延长,设施黄瓜的产量和品质均下降,土壤脲酶、蔗糖酶和碱性磷酸酶活性均呈先升高后降低的趋势。     

高梁组织培养研究进展

随着植物基因工程的发展,高粱的遗传转化已由理论研究转向应用研究,而高粱组织培养是遗传转化中的一个基础而重要的环节。论述了近年来高粱组织培养及植株再生方面的研究进展。     

Quercetin Promotes Auxin Transport in Arabidopsis thaliana

Study on the role of quercentin in polar auxin transportation. Arabidopsis was cultured on medium supplemented with quercetin to observe the growth of hypocotyls, 14C-IAA transport assays were conducted to measure the auxin transport activity. The results showed that Arabidopsis mutant auxl which had been deficient in auxin influx transportion obviously recovered the ability after cultured on the medium with quercetin. The polar auxin transport was promoted by the addition of quercetin. These results indicated that quereetin could promote polar auxin transport in vivo.     

Effects of Nitrogen Forms on Carbon and Nitrogen Accumulation in Tomato Seedling

Utilization of organic nitrogen （N） is an important aspect of plant N assimilation and has potential application in sustainable agriculture. The aim of this study was to investigate the plant growth, C and N accumulation in leaves and roots of tomato seedlings in response to inorganic （NH4^＋-N, NO3^-N） and organic nitrogen （Gly-N）. Different forms of nitrogen （NH4^＋-N, NO3^--N, Gly-N） were supplied to two tomato cultivars （Shenfen 918 and Huying 932） using a hydroponics system. The plant dry biomass, chlorophyll content, root activity, total carbon and nitrogen content in roots and leaves, and total N absorption, etc. were assayed during the cultivation. Our results showed that no significant differences in plant height, dry biomass, and total N content were found within the first 16 d among three treatments; however, significant differences in treatments on 24 d and 32 d were observed, and the order was NO3^--N 〉 Gly-N 〉 NH4^＋-N. Significant differences were also observed between the two tomato cultivars. Chlorophyll contents in the two cultivars were significantly increased by the Gly-N treatment, and root activity showed a significant decrease in NHa^＋-N treatment. Tomato leaf total carbon content was slightly affected by different N forms; however, total carbon in root and total nitrogen in root and leaf were promoted significantly by inorganic and organic N. Among the applied N forms, the increasing effects of the NH4^＋-N treatment were larger than that of the Gly-N. In a word, different N resources resulted in different physiological effects in tomatoes. Organic nitrogen （e.g., Gly-N） can be a proper resource of plant N nutrition. Tomatoes of different genotypes had different responses under organic nitrogen （e.g., Gly-N） supplies.