浅议我国现今丁辛醇的生产技术及其发展

丁辛醇是重要的基本有机化工原料。用丁醇生产的各种醚类、胺类可分别用作乳胶漆、织物加工粘合剂、农药和橡胶加工及皮革处理剂等。用丁醇生产的邻苯二甲酸二丁酯和脂肪族二元酸酯类增塑剂,广泛用于各种塑料和橡胶制品的生产。丁醇是生产丁醛、丁酸、丁胺和醋酸丁酯等有机化合物的原料,可用作树脂、油漆、粘接剂的溶剂及选矿用消泡剂,也可用做油脂、药物(如抗菌素、激素和维生素)和香料的萃取剂及醇酸树脂涂料的添加剂。辛醇主要用于制     

绝缘栅场效应管MOSFET在全固态中波发射机中的运用

MOSFET是全固态机,全面替代电子管中波发射机的关键技术中主要元件之一。本文从MOSFET的特点、运用原因检测、维修等方面进行了详细的专门介绍。给出了维修实例,总结出了一些维护经验。     

南瓜炒鸡丁

主料:鸡腿肉500克,南瓜250克,青椒1个。辅料:生粉少许,食盐、料酒适量,鸡精少许。做法:1.将鸡肉、南瓜、青椒洗净,切丁。2.鸡丁加入适量料酒、食盐、生粉,拌匀后腌制片刻。3.锅中倒适量油,油热下鸡丁,翻炒至颜色发白盛出。4.南瓜丁入锅,余油翻炒至稍软,加入     

2011年普通高等学校招生全国统一考试(广东卷)——理科综合

一、单选题1.小陈在观察成熟叶肉细胞的亚显微结构照片后得出如下结论,不正确的是()A.叶绿体和线粒体都有双层膜B.核糖体附着在高尔基体上C.内质网膜与核膜相连D.液泡是最大的细胞器2.艾弗里和同事用R型和S型肺炎双球菌进行实验,结果如下表.     

水杨酸铁的流变相合成和红外光谱

用流变相反应法合成了水杨酸铁配合物，对样品在4000—400cm^-1。范围内的主要红外光谱吸收峰进行了归属，通过元素分析、TG和IR确定该配合物的组成为Fe(HSal)3．3H2O(HSal=O-OHC6H4CO2)。     

键性成分与无机含氧酸盐的热稳定性

本提出有效电负性的概念，从微观结构分析无机含氧酸盐的热稳定性，对同系列不同盐的分解温度高低顺序提供了一个与实际情况较为相符的半定量依据。     

苯乙烯分散聚合反应制备均一粒径PS微球

在乙醇/水混合溶液介质中,以偶氮二异丁腈为引发剂,用分散聚合方法制备了聚苯乙烯微球.研究了引发剂浓度、反应温度和单体浓度变化对PS微球粒径的影响,实验结果表明引发剂浓度增大、反应温度升高、单体浓度增大都会使导致PS微球粒径增大及粒径分布加宽.     

让宝宝爱上蔬菜

鲜蔬果味小炒原料:黄瓜100克,胡萝卜1根,鸡蛋2个,葡萄干20克,西瓜丁、桃丁、精盐、橄榄油适量。制作过程:1.将黄瓜、胡萝卜洗净,去皮,切成丁。鸡蛋打入碗中,搅散。葡萄干洗净。2.炒锅放少许油,烧热,倒入鸡蛋液,炒熟后弄成碎块,盛出。     

Effects of osmotic stress on antioxidant enzymes activities in leaf discs of P<Subscript>SAG12</Subscript>-<Emphasis Type="Italic">IPT</Emphasis> modified gerbera

Leaf senescence is often caused by water deficit and the chimeric gene PSA612-1PT is an auto-regulated gene delaying leaf senescence. Using in vitro leaf discs culture system, the changes of contents of chlorophylls, carotenoids, soluble protein and thiobarbituric acid reactive substance （TBARS） and antioxidant enzymes activities were investigated during leaf senescence of PSA612-1PT modified gerbera induced by osmotic stress compared with the control plant （wild type）. Leaf discs were incubated in 20%, 40% （w/v） polyethylene glycol （PEG） 6 000 nutrient solution for 20 h under continuous light [ 130 μmol/（m^2·s）]. The results showed that the contents of chlorophylls, carotenoids and soluble protein were decreased by osmotic stress with the decrease being more pronounced at 40% PEG, but that, at the same PEG concentration the decrease in the transgenic plants was significantly lower than that in the control plant. The activities of superoxide dismutase （SOD）, catalases （CAT）, ascorbate peroxidase （APX）, guaiacol peroxidase （GPX） and dehydroascorbate reductase （DHAR） were stimulated by PEG treatment. However, the increases were higher in PSA612-IPT transgenic plants than in the control plants, particularly at 40% PEG treatment. Lipid peroxidation （TBARS content） was increased by PEG treatment with the increase being much lower in transgenic plant than in the control plant. It could be concluded that the increases in the activities ofantioxidant enzymes including SOD, CAT, APX, GPX and DHAR were responsible for the delay of leaf senescence induced by osmotic stress.