玉山笔石(Yushanograptus)——江西玉山宁国页岩组中的一个新笔石属

本文所讨论的材料是笔者之一(韩乃仁)于1961年夏在江西玉山李家棚附近的下奥陶统宁国页岩组中采得的(野外号码:F61001),代表一个新属新种,兹取名为“分离玉山笔石”(Yushanograptus separatus gen.et sp.nov.)。玉山笔石的特点是两个原始枝(横索)很长,分枝方式属于稜笔石式(穆恩之,1953,1956)。其尚未分枝的幼年时期,和一些纤细的对笔石,如Didymograptus gracilis T(?)rn-quist,D.congnatus Harris et Thomas 等,非常相似,每一原始枝在生长了11—12个胞管之后才开始正分枝,连续到六级以上。这种原始枝特长的特征,与联笔石(Zygograptus)相似,但分枝的形式不同。联笔石的分枝为枝笔石式,而我们的新属的分枝则为左右相间     

异色瓢虫重名变种在新疆的出现

具有六个红点的典型 axyridis 变种,根据 Dobzhansky(1953)等人的分析,以西伯利亚中部偏西地区为分布中心,向东伸展,但在数量上大量减少,而在西伯利亚以外,则仅仅出现在四川和日本。作者自从在青岛崂山标本中发现重名变种后,又查得在辽宁、河北、     

Colony development and formation in halysitid corals

Lee, D.-J. & Noble, J. P. A. 1990 04 15: Colony development and formation in halysitid corals. Lethaia , Vol. 23. pp. 179–193. Oslo. ISSN 0024–1164.
Modes of colony formation and their relationship with colony morphology, size and substrate characteristics in species of halysitid corals have been studied. Two distinctive modes of colony formation in halysitids are proposed. In the monoplanulate mode. represented by Catenipora snnplex . the colony is developed from a single protocorallite and colony formation is achieved by a combination of asexual increase and intracolony fusions. In contrast, the polyplanulatc mode is demonstrated by C. escharoides . in which the early colony formation is achieved primarily by fusions of many 'incipicnt colonies' of more than a single planulate origin and of different generations. The latter mode has not previously been described in tabulates and has significant implications for coloniality, reproductive and life history characteristics, histo-compatibility and adaptative ecology. The colony size and morphology. and The distribution of halysitid species were primarily determined by the modes of colony formation and the substrate characteristics. Colonies of the monoplanulate mode. when developed on soft substrates, exhibit a small and spherical morphology with isolated distribution patterns, while those developed on hard substrates are tabular and variable in size. depending on the availability of substrate. In colonies of the polyplanulate mode, on the other hand. the size of the colony is largely dependent on The frequency and timing of allograft fusion. They are characteristically found on soft substrates. often as dense mono specific thickets. The mode of colony formation in halysitids is probably species-specific and results in the adaptation to substrates. * Colony development, halysitid corals, Anticosti Island. Gotland .     

Homologies to the tomato endopolygalacturonase gene in the peach genome

Abstract. Peach endopolygalacturonase was isolated from the mesocarp tissue of soft ripe, freestone peach fruit, but was not detectable in mature pre-ripening fruit. It is a basic protein with a M_r of approximately 45000 Da, and cross-reacts with antibody to tomato endopolygalacturonase. Using a cDNA to the tomato enzyme as a probe, a fragment of peach genomic DNA was isolated which encoded about 50% of the peach enzyme. The nucleotide sequence of the fragment was determined and the amino acid sequence of part of the peach endopolygalacturonase peptide derived. Coding regions of the peach gene show extensive homology with related regions of the tomato gene. Introns are dissimilar. Endopolygalacturonase activity occurs in ripe 'freestone'peaches but not in the firmer 'clingstone'varieties. Hybridization studies identified a similar gene fragment in freestone, semi-freestone and clingstone peach varieties.     

白鹇距长与年龄的关系

注意到白鹧雄鸟距长在一定时期内随年龄增长的事实,本文根据相邻2年同一月龄之间有12个月的间隔,距长数据除有较为集中外一定又有组间明显差别的特点,推测估计部分标本之年龄,加上确知年龄的部分标本,共测定89个个体120个距长样本数据,得到距长随年(月)龄增长的关系式:SL=am/1+bm,用此式可以实测距长初步估计野外采集到的白鹇个体的年龄     

反义寡核苷酸片段可抑制鲫鱼视网膜电压依赖性钾离子通道的表达

爪蟾卵母细胞经注射鲫鱼视网总ＲＮＡ后,可表达大量电压依赖性钾离子通道。在此基础上,我们进一步发现,一个特定序列的寡核苷酸能专一地抑制该通道的表达。由于我们设计与合成的该片段与果蝇、小鼠中已克隆的钾通道中编码Ｎ端的一个多肽的ｍＲＮＡ完全互补,因此推测：鲫鱼视网膜中的Ｋ这个区域与其它物种的Ｋ通道有高度同源性,这为克隆该基因和研究它的功能提供了重要资料。     

大鼠肝癌模型CBRH—3的建立及其生物学特性

用ＤＥＮＡ诱发近交系Ｗｉｓｔａｒ大鼠,经三个月后得原发性肝癌,移植于同品系幼鼠,从而建立了 一株染色体众数正常,ＡＥＰ阳性的大鼠移植性肝癌模型,命名为ＣＢＲＨ－３,病理鉴定为肝细胞型肝 癌。至今已传至６０余代,目前生长稳定。     

膜融合的分子机制:线粒体呼吸链不同偶联部位质子泵活性与膜融合程度之间的定量相关性(英文)

我们测定了鼠肝线粒体呼吸链不同偶联部位的质子系活性并通过荧光能量共振转移 法分析了鼠肝线粒体膜与脂质体（二油酰磷脂乙醇胺／心磷脂＝８／２）的膜融合程度。根据测量呼吸链第一段及第二段偶联部位的Ｈ＋／偶联部位的化学计量比值,观察到线粒体呼吸链质子泵的质子（Ｈ＋）泵活性及 Ｈ＋泵出量与膜融合程度呈现线性的定量相关性。这些实验结果进一步支持了我们提出的质子泵诱导膜融合的理论模型（刘树森等,１９８７、１９８９）。     

FT Ⅰ, a novel positive myeloid-lineage-specific transcription regulatory element within the mouse myeloperoxidase gene enhancer, En 1

INTanDUCTI0NMyeloidcelldifferentiati0n,inwhichmultip0tentialprogenitorcellsarec0nvertedint00neofthesixmaturedifferentiatedcells,i.e.,erythr0cytes,platelets(megakary-ocytes),macr0phages,neutr0phils,e0sinophilsandbas0phils,involvestemporalre-gulati0nofexpression0fanumberoflineage-anddifferentiationstage-specificgenes.Understandingthedevel0pmentalspecificationoflineageaJswellasmaturationstageassociatedpatterns0fgeneexpressioninmyel0idcelldifferentiationrequiresanin-sightintothecontrol0findivid…     

乌奴龙胆中五个新的环烯醚萜甙

从藏药乌奴龙胆（ＧｅｎｔｉａｎａｕｒｎｕｌａＳｍｉｔｈ）（龙胆科）的全草中分离到５个新的环烯醚萜甙,命名为乌奴龙胆甙（ｇｅｎｔｉｏｕｍｏｓｉｄｅ）Ａ－Ｅ;它们的结构主要通过光谱分析得以确定。其中,乌奴龙胆Ａ－Ｃ是二聚环烯醚萜甙,而乌奴龙胆甙Ｄ和Ｅ为马钱素型的环烯醚萜甙,所有这些化合物的分子中都具有一个２,３－二羟基苯甲酰基或其衍生物的取代基。