河南济源晚石炭世太原组的一种复体四射珊瑚

Ａｃｒｏｃｙａｔｈｕｓ是一类块状体或丛状体的四射珊瑚，在北美分布于下石炭统，我国见于上石炭统，但丛状体的在我国系首次发现。在连续切片上，可见两个生长阶段，其繁殖方式有侧芽繁殖和边缘泡沫板内繁殖，系统分类上另置独立的科级分类。根据形态分析，该珊瑚栖息在动水，能量略高及食料丰富的浅水环境。当前标本为一新种：Ａ．ｊｉｙｕａｎｅｎｓｉｓｓｐ．ｎｏｖ．。     

Paleoecology of Sphenothallus on an Upper Ordovician hardground

A hardground from the Upper Ordovician Dillsboro Formation near Dillsboro, Indiana, U.S.A., preserves an assemblage of encrusting and boring fossils on both top and bottom surfaces. The slab is inferred to have been an undercut ledge, and the dominant fossils of the assemblage, holdfasts of the tube-building worm Sphenothallus and trepostome bryozoans, are prevalent on both sides. The clumping of Sphenothallus holdfasts has been statistically demonstrated using a nearest-neighbor technique. Sphenothallus has also been shown to withstand overgrowth in interactions with bryozoans.     

Late Famennian gastropoda from south-west England

The gastropod fauna of the Upper Devonian Baggy and Pilton formations in south‐west England is revised and includes some 30 taxa. The topmost part of the Upper Famennian succession in Devon is represented by clastic near‐shore and shallow shelf sediments, indicating a short‐term transgressive phase (‘Strunian Transgression’). The sequence yields a highly diverse fauna dominated by brachiopods and ostracodes, locally supplemented by crinoids, bryozoans, trilobites and molluscs. The taxa ‘Patellostium’britannicum sp. nov., Angyomphalus (Angyomphalus) junius sp. nov. and Dictyotomaria eurocapillaria sp. nov. are erected; a junior homonym is replaced by Macrochilina? piltonensis nom. nov. The gastropod fauna displays an independent character, where latest Devonian faunal elements overlap with Late Palaeozoic taxa expressing a transition similar to that of the bivalves, brachiopods, echinoderms and corals, without a sharp faunal break at the Devonian/Carboniferous boundary. Apart from the Caenogastropoda, all subclasses of gastropods are represented. Members of the bellerophontoids, pleurotomarioids and loxonematoids are most abundant, followed by murchisonioids, naticimorphs, euomphalomorphs and platyceratoids. The various gastropod groups represent different ecological demands and trophic categories, and together with the accompanying fauna indicate that nearly all habitats and niches were occupied in the shallow South Laurussian Shelf.     

灰色多目标局势决策在晋西北植树造林中的应用

采用灰色多目标局势决策方法确定了晋西北地区不同土地类型上的最佳造林树种．在梁峁坡地、阴沟坡地、阳沟坡地和河滩地上的最佳造林树种分别是柠条、油松、刺槐和杨树     

孤峰组最底部的牙形刺动物群

在孤峰组底部发现了包括Ｍｅｓｏｇｏｎｄｏｌｅｌｌａ ｎａｎｋｉｎｇｅｎｓｉｓ在内的牙形刺动物群。Ｇｏｎｄｏｌｅｌｌａ ｓｅｒｒａｔａ Ｃｌａｒｋ ｅｔ Ｅｔｈｉｎｇｔｏｎ,１９６２是Ｍｅｓｏｇｏｎｄｏｌｅｌｌａ ｎａｎｋｉｎｇｅｎｓｉｓ（Ｊｉｎ,１９６０）的同义名,Ｍｅｓｏｇｏｎｄｏｌｅｌｌａ ｎａｎｋｉｎｇｅｎｓｉｓ已被北美学者推荐为瓜达洛坪统底界的标志化石。因Ｍｅｓｏｇｏｎｄｏｌｅｌｌａ ｎａ     

Analytical treatment of pattern formation in the Gierer-Meinhardt model of morphogenesis

Summary We first perform a linear stability analysis of the Gierer-Meinhardt model to determine the critical parameters where the homogeneous distribution of activator and inhibitor concentrations becomes unstable. There are two kinds of instabilities, namely, one leading to spatial patterns and another one leading to temporal oscillations. Focussing our attention on spatial pattern formation we solve the corresponding nonlinear equations by means of our previously introduced method of generalized Ginzburg-Landau equations. We explicitly consider the two-dimensional case and find both rolls and hexagon-like structures. The impact of different boundary conditions on the resulting patterns is also discussed. The occurrence of the new patterns has all the features of nonequilibrium phase transitions.     

Ultrastructural changes in muscle mitochondria in situ,including the apparent development of internal septa,associated with the uptake and release of calcium

Treatment of mammalian muscle with the divalent cation ionophore A23187 causes the release of Ca2+ from the sarcoplasmic reticulum and allows the ultrastructural changes of the mitochondria during Ca2+-uptake to be demonstrated in situ. Electron micrographs reveal that the mitochondria swell dramatically during uptake, before contracting again when the accumulated Ca2+ is released once more into the cytoplasm. When maximally swollen, the mitochondria are apparently subdivided and internal "septa" are formed. The ultrastructural details concerning these internal membranous structures are shown in detail and their significance is discussed.     

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.     

山西朔县种子植物区系及其生态经济意义

朔县(现朔州市朔城区)植物种属相对丰富,具有维管束植物938种,隶属于420属,105科。其植物区系主要起源于古北大陆;种子植物属的地理成分复杂多样,以温带成分占绝对优势,具有典型的温带草原性质;与相邻地区植物区系的比较分析表明,联系最为密切的是蒙古草原植物区系,其次是黄土高原植物区系。该县植物资源利用应采取的对策是:既要合理开发利用,又要加强物种的保护。