微波法水提取沙棘叶中黄酮的研究

以水为介质，对沙棘叶进行微波处理提取黄酮，其提取效果与常规水浸提法比较表明，微波提取效率大大提高.微波水提取黄酮的最佳工艺条件为：微波功率360W，提取时间3min，沙棘叶粉与水的质量比为1：30，提取率为1．21％．     

含硫席夫碱及其锰配合物的合成与生物活性

合成了2-乙酰基吡嗪单缩二氨基硫脲、2-乙酰基吡嗪缩二氨基硫脲缩5-氯水杨醛及其锰配合物,用IR、UV、元素分析等多种手段对它们进行了表征,并测试了它们对金黄色葡萄球菌、枯草芽孢杆菌、苏云金芽孢杆菌、大肠杆菌和铜绿假单孢菌的抑制情况．     

ENSO循环与行星位置的相互关系Ⅱ:行星视赤经与赤道东太平洋海温的联系

 利用通用天文软件SKYMap Pro Version 8提供的大行星冲日资料和计算得到的各大行星视赤经资料,分析了行星相对位置与ENSO之间的相互关系,结果发现两者之间存在明显联系,主要有:三大行星(火、木、土)在3月冲日,有利于在当年发生EL-Nino事件,且火星和木星对应的事件持续时间都较长,特别是木星3月冲日与1990s以后的2次EL-Nino群发期有很好的对应,与土星对应的事件持续较短.火星和木星在8月冲日有利于次年发生EL-Nino现象,土星则不明显.火星和木星在9月冲日容易在当年发生LA-Nina现象,而土星在9月冲日的头一年易发生EL-Nino,次年易发生LA-Nina.对行星的视赤经与赤道太平洋海温关键区之间相互关联的非偶然性检验表明,只有木星和土星存在相关区.木星视赤经相对于Nino 4海温距平大于0的概率呈现偏心结构,并存在2个奇对称区域;土星的对应区相对比较均匀,存在3个偶对称区域,且彼此相差60°,在空间上构成六角型结构.     

海参内脏酶解制备海参肽工艺

以蛋白水解度和酶解液中海参肽相对分子质量的分布作为指标,考察不同蛋白酶的酶解效果,筛选水解海参内脏的最适合蛋白酶,并通过单因素实验和正交实验优化酶解工艺.实验结果表明:胰蛋白酶的水解效果最佳,可用于水解海参内脏制备海参肽;在底物质量分数为1.0%,加酶量为0.375 1 mkat·g^-1,pH值为8.0,酶解温度为37 ℃,水解时间为5 h的最优酶解条件下,海参内脏的水解度可达到48.90%,酶解液中的多肽(2 000~5 000 u)质量分数为52.68%,寡肽(含氨基酸)(≤2 000 u)质量分数为47.25%.     

ENSO事件对云南短期气侯影响的研究

利用云南1951～1997年逐月降水和气温资料和全于1951～1997年月平均海温资料,统计了云南降水和气温对赤道东太平洋海表温度变化的响应,结果表明：云南降水和气温与赤道东太平洋海温的异常有着密切的关系。     

氧同位素：追踪陆架海沿岸水团变化的良好标志

对于陆架海而言除了冰体积效应,温度效应外,还有由于大陆淡水注入引起的,使δ＾１８Ｏ值负向偏移的效应,而且在低海平面时期,当沿岸水团盛行时,这种效应起主导作用。笔者将这种效应从广州的盐度效应中分离出来,称为陆架海的负值效应。     

Linkage between the Asian-Pacific Oscillation and the sea surface temperature in the North Pacific

The linkage between the Asian-Pacific Oscillation (APO) and the sea surface temperature (SST) in the North Pacific during the summertime (June-August) is preliminarily investigated through an analysis of observed data.It is found that APO is significantly and positively correlated to the North Pacific SST,with the correlation coefficient being 0.58 on the interannual timescale during the period 1954-2003,which suggests that a strong (weak) APO corresponds to high (low) SST in the North Pacific.Their in-phas...     

Notable diversity in hemoglobin expression patterns among species of the deep-sea clam, <Emphasis Type="Italic">Calyptogena</Emphasis>

The deep-sea clams Calyptogena nautilei and C. tsubasa, which live in the cold-seep area at a depth of 3570 m in the Nankai Trough, Japan, have abundant hemoglobins (Hbs) in erythrocytes, similar to other Calyptogena species. We determined the cDNA-derived amino acid sequences of Hbs from two Calyptogena species. C. tsubasa was found to contain two dimeric Hbs, Hb I consisting of 145 amino acid residues and Hb II with 137 residues, similar to known Hbs from C. soyoae and C. kaikoi. Sequence identity was over 90% among the orthologous chains of Calyptogena Hbs. On the other hand, surprisingly, C. nautilei contained two monomeric Hbs, Hb III containing 141 residues and Hb IV with 134 residues. In addition, Hbs III and IV showed only 33–42% sequence identity with Hbs I and II from other Calyptogena species. The distal (E7) histidine, one of the functionally important residues of the heme protein, is replaced by glutamine in all Hb chains of Calyptogena species. A phylogenetic analysis indicated that C. nautilei Hb III is closer to Hb I from other Calyptogena species. We suppose that a Hb gene was duplicated at least three times in an immediate ancestor of Calyptogena and, presumably depending on physiological conditions different Hb sets are being expressed: dimeric Hbs I and II in C. soyoae, C. kaikoi and C. tsubasa, and monomeric Hbs III and IV in C. nautilei. Received 13 May 2003; received after revision 5 June 2003; accepted 12 June 2003     

超长电磁波遥测技术在渤海深部油气勘探中的应用

根据渤海西岸和渤海中部两口探井的探测和对比实验分析,利用超长电磁波遥测技术可以根据已知探井的探测对比分析预测新探井的岩性界面,协助井位的选址和设计。另外,利用超长电磁波的探测技术可以从剖面和平面上对远景区进行普查性探测,编制远景区的构造图。根据塘沽-大连探测的超长电磁波频谱曲线剖面对比分析,证实引起渤海中部重磁异常高的地质体可能是基性超基性岩体。渤海中部地区的岩浆活动为本区的有机物成熟提供了热机制,因此,渤海中部地区可能是渤海深层天然气的勘探远景区。     

北极研究，从梦想走向辉煌

走向南极和北极,是多少代中国人的两大梦想。1984年,中国第一次南极考察,将走向南极的梦想变成现实,并延续成长达28年的美丽画卷。然而,虽然北极距离中国更近,但走向北极的梦想实现起来要困难得多,北极科学考察的起步整整晚了11年。今天中国的北极研究与南极研究一样,正在走向辉煌。