辽宁营口藏山洞穴地点试掘报告

本文报道了藏洞穴地点试掘的结果。试掘地点的地层可分上、下两组：上组属晚更新统,下组属中更新统,大体与金牛山Ｃ地点下组的时代相当。在这一组中,发现了一些零星的用火遗迹和石制品。     

A novel repetitive sequence associated with the centromeric regions of Arabidopsis thaliana chromosomes

 The middle repetitive fraction of the Arabidopsis genome has been relatively poorly characterized. We describe here a novel repetitive sequence cloned in the plasmid mi167, and present in ∼90 copies in the genome of Arabidopsis thaliana ecotype Columbia. Hybridization analysis to physically mapped YAC clones representing Arabidopsis chromosome 4 revealed four mi167-hybridizing loci, all clustered near the centromere. No other loci were detected on YAC clones covering chromosome 4. In situ hybridisation experiments to Arabidopsis chromosome spreads showed that mi167-hybridizing sequences are clustered at the centromeric heterochromatin of all five chromosomes; on two chromosomes the hybridization appeared to be localised on one arm. Additional mi167-hybridizing loci were detected, one of which was adjacent to a non-centromeric, heterochromatic region. This work supports the idea that the majority of middle repetitive DNA in the Arabidopsis genome is clustered. It also adds to our understanding of the organization of the centromere of Arabidopsis chromosome 4. Received: 19 February 1996 / Accepted: 30 June 1996     

中老年心血管疾病患者肠道菌群的初步分析

本文对２４例心血管疾病中老年患者的肠道菌群进行了初步调查。结果表明四类菌群数均值（ＬＯＧ１０￣Ｎ／克湿便）,按从多到少的顺序分别是：双歧杆菌１０．２２±１．０６,类杆菌１０．１９±１．０９,肠球菌８．７５±０．７３,肠杆菌科８．６３±０．８７。并概要讨论了这些数据的意义。     

陕西蓝田锡水洞啮齿动物群的性质与时代

锡水洞啮齿动物化石共6科19属25种.其中大部分为东洋界种类,因此具有强烈的南方色彩;喜湿热的现生啮齿类占绝对优势,它反映了一个气候相对湿热的时期,表明锡水洞遗址当时具有亚热带森林环境.该啮齿动物群的时代为中更新世;它既可与南方歌乐山期各动物群直接对比,又可与北方周口店第一地点动物群对比,因此在研究南北动物群对比上具有重要意义;它的时代比公王岭动物群的晚,比陈家窝动物群的可能也稍晚.     

四川自贡大山铺的龟化石

四川自贡大山铺富产中侏罗世的龟类。这批化石,除个别几件已有记述外,其余更多保存在自贡恐龙博物馆的标本均未报道。本文除对它们进行系统记述外,并综观我国迄今已知中侏罗世的龟类,建立一新科,成渝龟科(Chengyuchclyidae fam.nov.),解决了我国这一时期龟类长期未定的归科问题。     

ON ALLOPTOX (LAGOMORPHA, OCHOTONIDAE)FROM THE MIDDLE MIOCENE OF TONGXIN, NINGXIA HUI AUTONOMOUS REGION, CHINA

<正> Rather abundant sample of Alloptox, including skulls, maxillae, mandibles and isolated teeth, was collected from the middle Miocene of Tongxin County, Ningxia Hui Autonomous Region during the two field seasons in 1985 and 1986, when reconnaissance and geological mapping of the middle Miocene in this region were conducted by a joint party of the Institute of Vertebrate Paleontology and Paleoanthropology, Academia Sinica (IVPP) and the Bureau of Geology, Ningxia Hui Autonomous Region. The specimens came from 18 localities pertaining to 9 levels in a sequence of middle Miocene fluviatile sediments with a thickness of ca. 200m. Except for the specimens assigned to Alloptox sp. from locality Taoziliang, all are recognized as Alloptox gobiensis. The present paper deals with only their dental morphology which is probably phylogenetically significant. Altogether 327 specimens of Alloptox gobiensis and 27 specimens of Alloptox sp. have been described. The text figures are drawn by the authors and Mrs. Yang Mingwan. All teeth are presented as left ones, the abbreviatd word "inv" is used under the figures of right teeth. All specimens are stored in IVPP under the inventory number V8822-V8839. The authors are much obliged to Prof. Qiu Zhanxiang for reading and correcting the English version of this paper.     

云南盘溪地区节甲类鱼化石

本文记述了采自云南盘溪地区一节甲类鱼化石.作者1982年曾根据在该地区采获的少数骨片定为 Dunkleosteus yunnanensis.通过对原标本和新材料的仔细观察以及与有关属种对比,认为原定的 Dunkleosteus yunnanensis 应为 Eastmanosteus yunnanensis.     

Increased density of fluorescent adrenergic fibers around the middle cerebral arteries of stroke-prone spontaneously hypertensive rats

The distribution of fluorescent adrenergic nerve fibers in the proximal portion (horizontal segment, Hs) and the three distal portions (major branches) of the middle cerebral arteries (MCA) was examined in stroke-prone spontaneously hypertensive rats (SHRSP) aged 10, 30, 60, 90, and 180 days, by the glyoxylic acid method. The results were compared with those in agematched normotensive Wistar Kyoto (WKY) rats. While the distribution pattern of fluorescent nerve fibers in the proximal portion of WKY rats changed from a straight linear arrangement at 10 and 30 days of age to a network-like arrangement after 60 days, those from SHRSP showed a constant meshwork pattern throughout the entire examination period. In the distal portions of the MCA of both SHRSP and WKY rats at all ages examined, fluorescent nerve fibers formed a coarse network. The distribution densities of adrenergic nerve fibers in the proximal and distal portions of the MCA of SHRSP were significantly higher (P<0.01 and 0.05) than those of WKY rats at all ages examined, except in the proximal portion at 90 and 180 days of age. The difference in nerve fiber density between SHRSP and WKY rats reached a peak at 30 days of age in both proximal and distal portions, and then gradually decreased with age. The present study suggests that sympathetic hyperinnervation is an important factor in the development of hypertension, and is involved in its maintenance in SHRSP.     

云南武定中泥盆世骨鳞鱼目一新种

本文记述的是采自云南武定中泥盆统地层中的一个总鳍类、骨鳞鱼目(Osteolepiformes Jarvik 1942)、骨鳞鱼科(Osteolepididae Cope 1889)的瑟索鱼属(Thursius)化石新种——武定瑟索鱼(Thursius wudingensis sp. nov.).对骨鳞鱼化石的记述在国内尚属首次.本文除了对化石新种进行描述和分类之外,还对武定瑟索鱼的生物地理意义以及它与杨氏鱼的关系作了尝试性的探讨.     

Growth and yield of young Quercus ilex coppice stands in the Tafferte forest (Morocco)

The coppice method is the silvicultural system commonly applied to Quercus ilex (holm oak) forests for the production of firewood and charcoal. Although the holm oak is the species that covers the largest area in Morocco (1400 000 hectares), little is known about its growth and yield. The objective of this study is to quantify the stand growth and yield of young coppice holm oak stands in the Tafferete forest in the eastern part of the Middle Atlas (Morocco).Equations relating dominant height to age, and basal area, volume, and number of trees to dominant height were developed and used to derive young holm oak coppice yield estimates.The growth and yield information developed in this study may have a greater utility in defining cultural measures that should be applied in the early stage of holm-oak coppice stands.