蓖麻籽蛋白质的粗分离

以蓖麻籽中总蛋白为研究对象,对磷酸盐法提取蓖麻籽中粗蛋白过程进行优化。结果表明,在硫酸氨饱和度为70%时对蓖麻籽中粗蛋白的提取效率最高;利用优化后的磷酸盐法对7个不同发育时期的蓖麻籽中的蛋白质进行粗提取,并利用紫外分析法对所提取的不同生长阶段的蓖麻籽中的粗蛋白进行比较分析,结果发现自植株授粉后到获取蓖麻籽的时间间隔越长蓖麻籽中总蛋白积累量就越高。     

攀西地区烤烟质量评价指标典型相关分析

以四川省主产烟区攀枝花和凉山州2012年的72份红花大金元烤烟样品中部叶为供试材料,应用典型相关分析方法分析了烟叶外观质量、化学成分和评吸质量评价指标间的典型相关性。结果表明：烟叶外观质量、化学成分和评吸质量评价指标间均存在典型相关关系;烟叶质量不同评价指标的相关程度不同,其中烟叶化学成分与评吸质量关系最密切,其次是外观质量和评吸质量。在烟叶质量组间关联上起主要作用的外观质量评价指标是成熟度、身份,化学成分评价指标是总糖、还原糖、总氮,评吸质量评价指标是香气质、香气量、杂气、刺激性、干燥感。     

蒙古族传统储藏类家具装饰图案艺术特征探微

从图案的“文”与“质”两个角度对蒙古族传统储藏类家具装饰图案的艺术特征进行了探索.从图案的外在形式角度对图案的艺术特征进行分析,并对其对称与均衡,统一与变化,对比与调和的特征进行阐述;从图案的内在含义角度对图案的内涵意义特征进行了探究,并对其崇拜情结,尚武精神,吉祥如意愿望的内涵进行了探源.通过对蒙古族传统储藏类家具装饰图案艺术特征的发掘,以期达到更好地服务于民族特色现代家具设计的研究目的.     

科研院所外事管理工作的可持续发展

该文汲取30多年单位外事工作经验,分析了当今科研单位外事工作存在的主要问题,探讨了促进科研院所外事管理工作可持续发展的方法。为新时期寻求科研院所国际交流与合作跨越式发展道路提供了新的借鉴。     

Effects of light intensity and quality on the obligate shade plant Aglaonema commutatum. I. Leaf size and leaf shape

The effect of different light intensities and light qualities were studied on Aglaonema commutatum plants grown in controlled environments. Three light intensities—2.7, 5.4 and 20.0 junolm-2s-1 provided by two light sources (fluorescent and blended-light lamps) were tested on two plant materials of different size. When plants completed their adaptation to low light intensities (2.7 and 5.4 umol m“2s_1) readaptation to high irradiances (20.0 (xmol m-2s_1) was studied. Ten to twelve months were required for a leaf initiated in each light treatment to become fully expanded. The adaptation of this species to low light was far slower than other sun- or shade-plants. Plants grown at 2.7 |xmol m-2s~‘ expanded smaller and thinner leaves, with lower length: width ratio. These responses were affected by the size of the primordia at the beginning of the light treatments. Light quality affected these too but the responses were weak and lacked a defined pattern. The readaptation to high light intensity of plants adapted to 2.7 or 5.4 (xmol m_2s_1 required 6-8 months, after that leaves showed the same sizes and shapes as controls in high irradiance.     

Innovative light management to improve production sustainability,overall quality,and the phenolics composition of nectarine (Prunus persica cv. Stark Red Gold)

Summary

This research was conducted under the framework of the ISAFRUIT Project and aimed to investigate the effects of different light micro-environments on the final overall quality of nectarine fruit production. Experiments were conducted in a commercial orchard of the nectarine (Prunus persica) ‘Stark Red Gold’ during 2006 and 2007. Reflective mulches were laid down in the inter-row spaces in mid-May. Those environmental conditions affected by mulching such as temperature and reflected light were monitored until fruit harvest. Fruit production per tree was enhanced by mulch-treatment in both years, but the differences were statistically significant only in 2006, when the average fruit weight was also enhanced. Nectarines became more ripe in the 2006 season, whereas no differences in the main fruit quality indices were detected in 2007.The concentrations of phenolic compounds in ripe nectarines were positively enhanced in both years. The increase in concentration of overall phenolic compounds (in mg 100 g^?1 fresh weight) was calculated to be approx. 60% in 2006 and 2007, indicating an interesting improvement of the nutraceutical and anti-oxidant potential of nectarines. Experiments were also conducted using UV plus white light irradiation under controlled conditions. The accumulation of phenolic compounds, specifically anthocyanin concentrations, in nectarines previously screened using paper bags were determined at different times after irradiation. The results clearly indicated an inducing effect of UV plus white light irradiation on the synthesis and accumulation of anthocyanins in fruit skin. The consequences for the colour and health potential of nectarines are discussed.     

桑园杀虫剂桑蚕宝对养蚕生产的安全性试验

用8%的桑蚕宝稀释液桑园治虫,调查其对丝茧育和种茧育生产成绩的影响。结果表明:该农药对丝茧育较为安全,对原蚕饲育过程较为安全,但对化蛹和发蛾影响较大。     

Ellagic Acid and Polyhydroxylated Urolithins Are Potent Catalytic Inhibitors of Human Topoisomerase II: An in Vitro Study

Ellagic acid (EA), a natural polyphenol abundant in fruits and common in our diet, is under intense investigation for its chemopreventive activity resulting from multiple effects. EA inhibits topoisomerase II, but the effects on the human enzyme of urolithins, its monolactone metabolites, are not known. Therefore, the action of several synthetic urolithins toward topoisomerases II was evaluated, showing that polyhydroxylated urolithins, EA, and EA-related compounds are potent inhibitors of the α and β isoforms of human topoisomerase II at submicromolar concentrations. Competition tests demonstrate a dose-dependent relationship between ATP and the inhibition of the enzyme. Docking experiments show that the active compounds bind the ATP pocket of the human enzyme, thus supporting the hypothesis that EA and polyhydroxylated urolithins act as ATP-competitive inhibitors of human topoisomerase II.     

缺锌和高锌胁迫下苹果根系有机酸对锌的内稳性的响应

To elucidate the mechanisms of tolerance to zinc (Zn) deficiency and Zn toxicity in the root of apple trees, the apple rootstock Malus hupehensis (Pamp.) Rehd seedlings were selected to study the responses of organic acids to Zn homeostasis in roots under low Zn (0 μmol L-1 ), adequate Zn (as control, 4 μmol L-1 ) and toxic Zn (100 μmol L-1 ) treatments. The differences of Zn concentrations and accumulations in the roots were highest, compared with those in the stems and leaves, when apple seedlings were subjected to low and toxic Zn treatments for 1 d. The concentrations and accumulations of oxalic and malic acids in the roots in the low and toxic Zn treatments increased by 20% to 60% compared with those of the control treatment. Significantly negative correlations were found between the total Zn concentrations and the concentrations of oxalic and malic acids in the roots under 1 d of low Zn treatment. However, contrary correlations were found for the toxic Zn treatment. Meanwhile, the maximum influx rates of Zn 2+ under low and toxic Zn treatments increased by 30% and 20%, respectively, compared with the rate of the control treatment. Both Zn deficiency and Zn toxicity increased the concentrations of organic acids in root after short-time Zn treatment, which could resist Zn stress through balanding Zn homeostasis in M. hupehensis Rehd.