辽宁辽阳晚寒武世崮山组树形笔石

笔石发现于辽宁辽阳兰家晚寒武世崮山组 Drepanura 带,他们为 Dendrograptus liaoyangensis sp. nov., Dendrograptus liaoyangensis latus subsp. nov., Callograptus lanjiaensis sp. nov., Callograptus sp. A, Callograptus sp. B.,这是我国已知最低层位的笔石.     

广东南雄盆地上湖组介形类动物群及白垩-第三系界线

南雄盆地上湖组介形类可划分为2个性质不同的动物群及4个化石带:下部为 Porpocypris 动物群,是以中生代属种为主,中、新生代属种混生的过渡性动物群,时代为晚白垩世最晚期;上部为 Cypris 动物群,以 Cypris 属占优势, Sinocypris 属开始出现, Cypridea 等古老属种绝灭为主要特征,时代为早—中古新世.根据介形类演化发展阶段和白垩纪末生物绝灭事件,南雄盆地白垩系与第三系的界线应划在 Porpocypris 与 Cypris 动物群之间,即上湖组坪岭段与下惠段之间.     

黑龙江绥滨地区晚侏罗世东荣组的沟鞭藻类

本文对黑龙江绥滨86-11孔的沟鞭藻类进行了初步研究,共描述化石10属16种(包括2新种,6未定种);其中不少是在我国首次描述的。这些化石分成两个组合,其优势分子分别为Gonyaulacysta jurassica和Amphorula delicata。根据组合内各分子的时代分布,两化石组合的时代分别为Late Oxfordian—Early Kimmeridgian和Portlandian期,并对其产出层位东荣组的时代作了讨论,认为属于晚侏罗世。     

Permeability Increase Induced by Escherichia coli Hemolysin A in Human Macrophages is Due to the Formation of Ionic Pores: A Patch Clamp Characterization

Escherichia coli hemolysin is known to cause hemolysis of red blood cells by forming hydrophilic pores in their cell membrane. Hemolysin-induced pores have been directly visualized in model systems such as planar lipid membranes and unilamellar vesicles. However this hemolysin, like all the members of a related family of toxins called Repeat Toxins, is a potent leukotoxin. To investigate whether the formation of channels is involved also in its leukotoxic activity, we used patch-clamped human macrophages as targets. Indeed, when exposed to the hemolysin, these cells developed additional pores into their membrane. Such exogenous pores had properties very different from the endogenous channels already present in the cell membrane (primarily K⁺ channels), but very similar to the pores formed by the toxin in purely lipidic model membranes. Observed properties were: large single channel conductance, cation over anion selectivity but weak discrimination among different cations, quasilinear current-voltage characteristic and the existence of a flickering pre-open state of small conductance. The selectivity properties of the toxin channels appearing in phospholipid vesicles were also investigated, using a specially adapted polarization/depolarization assay, and were found to be completely consistent with that of the current fluctuations observed in excised macrophage patches. Received: 14 August 1995/Revised: 2 October 1995     

Hyolith guts in the Cambrian of northern Australia -turning hyolithomorphs upside down

A single specimen of the early Middle Cambrian (Ordian) orthothecimorph hyolith Gudugu-wan hardmani with preserved gut filling has been discovered in the Montejinni Limestone, Wiso Basin, northern Australia. This represents only the eighth such occurrence worldwide. The specimen is unique among orthothecimorphs in retaining the gut filling in combination with the external mould of the operculum and invites revision of the accepted soft-part recon struction in this group, whereby the opercular lateral processes are now recognized to be ventral. Thus orthothecimorph conchs, if horizontal in life, would have been oriented ventral side down, while hyolithomorphs adopted the reverse orientation: horizontal, ventral side up.     

Hydraulic sorting of microbiota in calciturbidites— A dinantian case study from the rheinische schiefergebirge,Germany

Summary A calciturbidite bed from the lower part of the Kieselkalk Formation (late cd II) at Wallau, eastern Rheinisches Schiefergebirge, displays ideal grading of reworked calcareous shallow-water microbiota, ranging from plurimillimetric agglutinated foraminifers and fragments of calcareous algae (Koninckopora sp.) to plurimicronic calcispheres, radiolarians and sponge spicules. Microbiota derived from all levels of the platform. Correspondingly, several carbonate microfacies types could be discerned. The early diagenetic micrite base of the turbidite preserved the anoxic basinal facies. The turbidite bed belongs to Foraminiferal Zone 15 (V3bα), theAlbaillella cartalla Zone (radiolarian chronology), and is the Lower and part of the Uppertexanus Zone (standard conodont zonation). From the few published data on foraminifers, the Kieselkalk is thought to range from Mid Viséan V2b to Late Viséan V3b gamma.     

河南叶县下寒武统辛集组单板类和腹足类化石的研究

本文描述和讨论了河南叶县杨寺庄下寒武统辛集组单板类１３种,腹足类２种,未定类１种。其中包括２新属６新种：Ｒｅｐｅｎｏｃｏｎｕｓ ｘｉｎｊｉｅｎｓｉｓ ｇｅｎ．ｎｏｖ．,Ｓｃｅｎｅｌｌａ ｐｙｃｎａ ｓｐ．ｎｏｖ．,Ｓｅｃｕｒｉｃｏｎｕｓ ｖｕｌｇａｒｉｓ ｓｐ．ｎｏｖ．,Ｏｂｔｕｓｏｃｎｕｓ ｇｒｏｓｓｉｃｏｓｔｕｓ ｓｐ．ｎｏｖ．,Ｉｇｏｒｅｌｌｉｎａ ｐｒｏｂｏｓｃｉｓ ｓｐ．ｎｏｖ．,Ｇａｌ     

山西棉区寄生在棉蚜体上的一种足绒螨（真螨目：绒螨科）

经鉴定,山西棉区寄生在棉蚜(Aphis gossypii Glover)体上有两种缄螨。除已报道的无视异绒螨(Allothrombium ignolum Willmann)外,尚有另一种足绒螨(Podothrombium sp.)本文对Podothrombium sp.的幼螨形态进行了描述;对该螨的背、腹毛数和须肢跗节毛数与足绒螨属已知的幼螨种类比较结果,它们之间存在着一定的差别。     

Eviostachya hoegii Stockmans在中国五通组的首次发现

首次描述了Eviostachya hoegii Stockmans的营养部分,通过大量标本的观察,修订了前人有关其生殖部分和解剖部分的描述,并对其生殖部分进行了复原.同意Emberger(1968)的观点,将其归于Eviostachyrales中.     

再论假裸枝叠层石科*

内蒙古桌子山地区中奥陶统公乌素组遗迹化石十分丰富.本文共鉴定、描述14个遗迹属、17个遗迹种,其中1新遗迹属——Biscopulatichnus、4新遗种和6未定种.并根据不同遗迹属在不同层位中的相对丰度,建立了4个遗迹组合,自下而上的顺序是:1. Taenidium-Phycodes 组合;2. Volkichnium 组合;3. Helminthopsis 组合;4. Granularia-Circulichnus 组合,大致相当于 Seilacher (1967) 的 Zoophycos 遗迹相,反映出公乌素组沉积期,水体较深且宁静、缺氧、有机质含量高,推测应为大陆斜坡环境.