莫桑比克罗非鱼孵卵期间口腔粘膜变化的研究

用组织学、组织化学和酶技术,对雌性莫桑比克罗非鱼在孵卵前后口腔粘膜的组织结构、抗菌酶的比活力变化进行初步研究。结果表明:在口腔粘膜的上皮中,杯状细胞是一个重要的结构,它随着雌鱼的生理状态的改变而变化。雄鱼、雌鱼和孵卵期的雌鱼口腔粘膜上皮中的杯状细胞数量上的差别显著。孵卵期的雌鱼口腔粘膜类似于哺乳动物的子宫粘膜也是受性激素影响的靶器官。该种鱼的口腔粘膜中存在着两种抗菌酶;蛋白质水解酶和壳多糖酶。孵卵前后,这两种酶的比活力分别提高1.4—2.03倍。说明孵卵时,口腔粘膜为使卵及仔鱼健康的发育,增强了抗菌能力。研究结果证明:抗菌力的增加与口腔粘膜中的杯状细胞的大量增生有着密切的关系。     

Zircon LA-ICP-MS U-Pb age, Ce^4＋/Ce^3＋ ratios and the geochemical features of the Machangqing complex associated with copper deposit

1IntroductionQuite a number of porphyry copper deposits havebeen found in the Cenozoic alkali-intrusions along theJinshajiang-Ailaoshan-Red River fault zone,whichconstitute the Cenozoic ore belt in China.The Cenozo-ic alkali-intrusive rocks are similar in…     

冀西北东坪金矿床含金石英脉石英流体包裹体Rb-Sr等时线及其地质意义

用石英流体包裹体Ｒｂ－Ｓｒ等时线法测得产于碱性岩体中具有超大型潜力的东坪金矿床含金石英脉的年龄为（１０３±８）Ｍａ，远晚于赋矿岩体的就位时间（元古宙），显示了成岩与成矿是两期不同构造运动的产物，两者之间没有直接的成因联系。８７Ｓｒ／８６Ｓｒ示踪结果显示成矿物质主要来源于赋矿碱性岩体。研究结果认为，东坪金矿是后期与大气降水热液有关的改造成矿作用的产物。     

Isotopic Characteristics and Key Factors Favoring the Formation of Fuwan Super-large Silver Deposit in Guangdong Province

Rb-Sr isochron age of fluid inclusions in quartz from the Fuwan super-large silver deposit is 68 - 6 Ma, the silver deposit is characterized by high μ values (10.67 - 10.95 ), which are much higher than those of the ore-hosted Paleozoic strata and are close to those of ores hosted in the Proterozoic metamorphic basement in western Guangdong Province. Based on the Pb isotopic characteristics, coupled with much high background silver contents (200-1000ng/g) in the Proterozoic basement and relatively low silver contents in the Paleozoic strata in the region of the Sanshui Basin, it is concluded that the ore-forming material of the super-large silver deposit came mainly from the old basement. The super-large silver deposit related genetically to the intense volcanic activities during the Upper Cretaceous to Eogene. The formation of the Fuwan super-large silver deposit is controlled by the following favorable geological conditions : ( 1 ) The intersection of deep faults and contemporaneous faults at the margin of the Sanshui Basin led to the formation of an excellent structure as passageway for ore fluids; (2) The special ore-hosted rock association forms a ore gathering-trap structure that favors the precipitation of ore; (3) The silver-rich old basement, multi-stage mineralization and multi-episode volcanic activities which constitute a geothermal convection system.     

Growth mechanisms and geochemistry of carbonate concretions from the Cambrian Wheeler Formation (Utah,USA)

Carbonate concretions provide unique records of ancient biogeochemical processes in marine sediments. Typically, they form in organic‐rich mudstones, where a significant fraction of the bicarbonate required for carbonate precipitation is supplied from the decomposition of organic matter in the sediments. As a result, carbonates that comprise concretions are usually characterized by broad ranges in δ¹³C and include values that are significantly depleted relative to seawater. This article reports results from a physical, petrographic and geochemical analysis of 238 concretions from the Wheeler Formation (Cambrian Series 3), Utah, USA, which are unusual in several respects. Most prominently, they formed in organic‐poor mudstones (total organic carbon = 0·1 to 0·5%) and are characterized by a narrow range of δ¹³C that onlaps the range of contemporaneous seawater values. Subtle centre to edge trends in δ¹³C demonstrate that concretion precipitation was initiated by local chemical gradients set up by microbial activity in the sediments, but was sustained during growth by a large pool of inorganic bicarbonate probably derived from alkaline bottom waters. The large inorganic pool appears to have been important in facilitating rapid precipitation of the concretion matrix, which occurred via both displacive and replacive carbonate precipitation during early diagenesis. Stable isotope data from cogenetic pyrite (δ³⁴S) and silica (δ¹⁸O) phases provide insight into the evolution of biogeochemical processes during concretion growth, and suggest that concretions were formed almost entirely during sulphate reduction, with only minor modification thereafter. Concretions of the Wheeler Formation appear to represent an end‐member system of concretion formation in which rapid growth was promoted by ions supplied from sea‐water. As such, they offer insight into the spectrum of processes that may influence the growth of carbonate concretions in marine sediments.     

CHIMEHERB中的有效成分对表皮细胞培养生长的影响

为观实CHIMEHERB有效成分,对新生小白鼠和人包皮外板的表皮细胞的生长影响,本文对7个实验浓度13次实验,112组592个组织块进行了组织培养的资料分析和机理的初步探讨,结果说明CHIMEHERB对表皮细胞无任何毒副作用,能100％的促进表皮细胞的生长.其相对生长率:小白鼠组为142.73％,人包皮外板组为440.58％,实验结果与临床应用效果一致.     

汇聚板块边缘岩浆中金属和氯的地球化学性质研究

总结了铜(Cu)、金(Au)、铼(Re)和氯(Cl)在汇聚板块边缘岩浆中的性质。在岛弧型的火山岩岩浆演化的早期,Cu、Au和Re均表现为中度不相容元素,含量随SiO2含量的增加而增加。在SiO2质量分数为58%时,多数岛弧型火山岩中Au、Cu的含量会突然大幅度下降。这一变化与铁和钛的变化是耦合的,铁和钛均由不相容元素变为相容元素,显示钛磁铁矿开始结晶了。进一步的研究表明,钛磁铁矿的结晶使硫酸根被还原为氢硫酸根,后者与Au、Cu形成氢硫酸根络合物,被萃取到流体相中,从而形成成矿流体。这一过程可以很好地解释Au、Cu矿床广泛分布于汇聚板块边缘的现象。与Au、Cu相反,Re的含量在SiO2质量分数为60%时才开始下降,而且是缓慢下降。这是因为Re通常比Au、Cu更亲石。此外,Re还具有强烈的挥发性。氯在东Manus岩浆中表现为高度不相容的特点。氯的性质主要受压力、初始水含量和岩浆演化分异程度的控制。计算结果显示,由于MORB和OIB含水量低,分异演化程度低,氯在上述岩浆中表现为高度不相容的特点。相比之下,氯在岛弧岩浆中的性质就复杂得多。随着水含量和岩浆房深度的不同,氯的性质可以从相容变到高度不相容。     

积云中去滴谱形成的数值模拟研究(一)——盐核谱和浓度的作用

本文利用一维非定常积云数值模式,详细地考虑云的微物理过程,模拟了积云发展前期云的宏微观结构,研究了盐核谱和浓度对积云中云滴谱形成的影响。结果表明,本模式模拟的云中上升气流和含水量等宏观特征与观测结果基本上一致,云滴谱分布和大云滴浓度以及它们随高度分布的特征等也与观测相符。在积云顶部附近还模拟出双峰云滴谱。结果还指出,大陆性积云云滴谱和海洋性积云云滴谱之间的差异,主要是由于两地空气中盐核总浓度不同所致,而不是由于巨核多少的缘故。     

张家口水泉沟碱性杂岩体单颗粒锆石^207Pb／^206Pb年龄分析

用单颗粒锆石铅蒸发－沉积法分析张家口地区赋金水泉沟碱性杂岩体形成时代,保持封闭体系３颗锆石的＾２０７Ｐｂ／＾２０６Ｐｂ值表面年龄在１６０７－１６６７Ｍａ之间,与锆石Ｕ－Ｐｂ法上交点年龄（１７１８±６５）Ｍａ基本一致,水泉沟碱性杂岩体是１６－１７亿前形成的。     

Coral recruitment to the reefs of Eilat, Red Sea: temporal and spatial variation, and possible effects of anthropogenic disturbances

The accelerating deterioration of the coral reefs of Eilat has raised debate over the exact causes and how they affect the reefs. The hypothesis of the present study was that a low recruitment rate of reef-building coral species may play an important role in the decline of the Eilat reefs. Our goal was to assess spatial and temporal recruitment patterns in Eilat, focusing on examining the possible impact of human activities. The results of coral recruitment to 10 series of ceramic tiles on metal racks, revealed very low overall recruitment relative to other geographical regions. In addition, we found that recruitment rates and recruit survival were lowest at sites closest to the major eutrophication sources in Eilat. The low recruitment rates may be chronically too low to compensate for the elevated coral mortality rates of recent years. The significant differences between the present study and a similar study carried out during the same period using a different method, emphasize the crucial need for a standardized method for recruitment assessment in coral reefs worldwide.