中国寻螨属一新种记述(蜱螨亚纲:长须螨科)

寻螨属Zetzellia在中国曾报道了两种:苹果寻螨Z.mail(Ewing)和北京寻螨Z.beijing Wang and Xu1987.本文描述了寻螨属一新种,庐山寻螨Z.lushanensis sp.nov.模式标本保存于江西大学生物系.文内测量单位为μm。     

Yeast thioredoxin genes

Based on the conserved protein sequence of thioredoxins from yeast and other organisms, two primers were synthesized for polymerase chain reaction of yeast genomic DNA. A 34-base pair (bp) sequence around the active site of yeast thioredoxin was obtained from the polymerase chain reaction product. This specific sequence was used as a probe in Southern blot analysis of total yeast genomic DNA digested with various restriction enzymes. Under conditions of high stringency, more than one DNA species hybridized with the probe, suggesting that more than one gene encodes yeast genomic library. Two Sau3A1 fragments, 825 and 2045 bp, respectively, from two different clones were cloned into pUC13. Sequence analysis of these fragments gave two different open reading frames without introns. The 825-bp Sau3A1 fragment encodes a 103-amino acid residue protein named thioredoxin I. The 2045-bp Sau3A1 fragment contains a sequence encoding thioredoxin II which has 102 amino acid residues. This is the first report of the cloning and sequencing of eukaryotic thioredoxin genes from any source. Both yeast thioredoxins contain a dithiol active site sequence, Cys-Gly-Pro-Cys. Thioredoxins I and II show 78% amino acid sequence identity. They display more amino acid sequence similarity with mammalian thioredoxin than with Escherichia coli and plant chloroplast thioredoxins.     

A NEW GENUS OF CAPRINI (BOVIDAE, ARTIODACTYLA) FROM UPPER PLIOCENE OF YUSHE, SHANSI

<正> In the present paper a new caprine, Sinocapra minor gen. et sp. nov. is erected on the basis of several horn cores. The type specimen was collected by the Sino-American Palaeontology Expedition from the Upper Pliocene, Mazegou Formation, of Yunzhu Subbasin, Yushe Basin, Shansi province in 1988. All the other ones referred to the new genus were described and identified by Teilhard de Chardin and Trassaert (1938, p. 53, fig. 46) as Antilope gen. et sp. indet. They also came from Zhaozhuang, Yunzhu Subbasin and it is likely that they might be gathered from the same Formation as the type specimen judging by the yellow sandy clay filling into the horn cores. Magnetostratigraphic studies by Prof. N. Opdyke of the Yunzhu Subbasin indicates that this stratigraphic interval only includes the Gauss one, approximately 3.4 to 2.47 Ma. Accounts of the biostratigraphy and dating of Yunzhu Subbasin are giyen by Dr. R. H. Tedford and Dr. Z. Qiu in another paper.     

四川省自贡市幼儿园3至5岁儿童乙型肝炎病毒感染情况及影响因素

为了解四川省自贡地区3～5岁幼儿乙型肝炎病毒(HBV)感染情况,并探索与感染有关的因素,1985年调查了1167名幼儿,其HBV总感染率为41.13％,HBsAg阳性率12.68％。幼儿的HBV感染与母亲HBsAg阳性密切相关。共检查母亲409例,38例HBsAg阳性,其幼儿HBsAg阳性率为50％(19/38),HBsAg阴性的母亲371例,其幼儿HBsAg阳性率9.97％(37/371),来自HBsAg阳性母亲的阳性子女占33.3％(19/56)。1986年随访HBV易感幼儿448例,HBV年感染率为12.95％(58/448),HBsAg年阳转率3.79％。HBV年感染率与原幼儿班级HBsAg阳性率的高低有关。     

为害黄芪种子的广肩种子小蜂属四新种(膜翅目:广肩小蜂科)

据我们在北京和内蒙古等地多年研究表明,黄芪的植食性种子小蜂包括广肩小蜂科Bruchophagus属5种和金小蜂科Habrocytus属1种,为多种混合群体。我们通过大量标本的形态比较以及交配行为的观察,结合其生物学特性研究以及应用扫描电镜对其并胸腹节花纹的超微结构观察,鉴定出黄芪种子里有5种广肩种子小蜂,即黄芪种子小蜂Bruchophagus huonchi Liao et Fan及本文的4新种。     

中国角胫象属（鞘翅目：象虫科）

角胫象属Shirahoshizo Morimoto,1962隶属象虫科隐喙象亚科,模式种为Cryptorhynchus rufescens Roelofs.本属昆虫多寄生于松属植物,有些是我国重要林业害虫,如马尾松角胫象Shiraho shizo flavonotatus(Voss),其成虫侵入衰弱的黄山松和堆积的马尾松原木,和其它钻蛀性害虫一起,造成严重危害,据浙江亚热带林研所赵锦年先     

显微高速摄影技术及其在血液微流变学研究中的应用

本文选用金黄地鼠的微血管,利用显微高速摄影技术,放大微观流场和血细胞,连续地“冻结”短瞬间的变化状态,把物理图象呈现在胶片上,经图像分析和数据处理,从定性及定量方面研究血液微流变学,为生命科学和医学研究提供了又一种新的方法。     

Southeast Asian Mitochondrial DNA Analysis Reveals Genetic Continuity of Ancient Mongoloid Migrations

Human mitochondrial DNAs (mtDNAs) from 153 independent samples encompassing seven Asian populations were surveyed for sequence variation using the polymerase chain reaction (PCR), restriction endonuclease analysis and oligonucleotide hybridization. All Asian populations were found to share two ancient AluI/DdeI polymorphisms at nps 10394 and 10397 and to be genetically similar indicating that they share a common ancestry. The greatest mtDNA diversity and the highest frequency of mtDNAs with HpaI/HincII morph 1 were observed in the Vietnamese suggesting a Southern Mongoloid origin of Asians. Remnants of the founding populations of Papua New Guinea (PNG) were found in Malaysia, and a marked frequency cline for the COII/tRNA(Lys) intergenic deletion was observed along coastal Asia. Phylogenetic analysis indicates that both insertion and deletion mutations in the COII/tRNA(Lys) region have occurred more than once.     

Bionics and Structural Biology： A Novel Approach for Bio-energy Production

Cellular metabolism is a very complex process. The biochemical pathways are fundamental structures of biology. These pathways possess a number of regeneration steps which facilitate energy shuttling on a massive scale. This facilitates the biochemical pathways to sustain the energy currency of the cells. This concept has been mimicked using electronic circuit components and it has been used to increase the efficiency of bio-energy generation. Six of the carbohydrate biochemical pathways have been chosen in which glycolysis is the principle pathway. All the six pathways are interrelated and coordinated in a complex manner. Mimic circuits have been designed for all the six biochemical pathways. The components of the metabolic pathways such as enzymes, cofactors etc., are substituted by appropriate electronic circuit components. Enzymes are related to the gain of transistors by the bond dissociation energies of enzyme-substrate molecules under consideration. Cofactors and coenzymes are represented by switches and capacitors respectively. Resistors are used for proper orientation of the circuits. The energy obtained from the current methods employed for the decomposition of organic matter is used to trigger the mimic circuits. A similar energy shuttle is observed in the mimic circuits and the percentage rise for each cycle of circuit functioning is found to be 78.90. The theoretical calculations have been made using a sample of domestic waste weighing 1.182 kg. The calculations arrived at finally speak of the efficiency of the novel methodology employed.