青海曲麻莱-治多地区巴颜喀拉山群(上三叠统)遗迹化石

首次对青海南部曲麻莱-治多地区巴颜喀拉山群上部(上三叠统)遗迹化石进行了系统采集,共采获遗迹化石33属54种。据遗迹化石的形态、习性、水深等环境成因特征,可划分为两类组合:一类以Cosmorhaphe,Helminthopsis,Helminthoida,Megagrapton,Paleodictyon等为主,产生于浊流事件前;另一类以Chondrites,Neo-nereites,Palaeophycus,Phycosiphon,Planolites,Zoophycos等为主,产生于浊流事件后,两者均为半深海-深海Nereites遗迹相的典型代表,反映晚三叠世研究区应为浊流沉积发育的复理石相沉积。     

快速城市化生态系统服务格局分析与空间管控——以厦门市为例

快速城市化对生态系统服务产生消极影响，科学识别二者的空间规律并进行管控对国土空间资源可持续开发意义重大。基于土地利用、遥感影像、POI等多源数据，借助ArcGIS、InVEST平台分析厦门市六类生态系统服务的空间分布及权衡协同格局，并引入人工神经网络算法与土地利用程度指数模型定量识别城市化空间格局，通过决策矩阵提出空间管控策略。结果表明：①厦门生态系统服务分布在"陆-海"方向上分异显著，岛外地区综合生态系统服务指数总量占全域的91.78%，其中同安区的总量和均值都处于首位；②生态系统服务之间以协同作用为主，在全局关系中生境质量与雨涝调蓄以及与温度调节的协同水平最高，在局部空间关系中水源涵养与雨涝调蓄的协同水平最高，休闲游憩服务与其他服务的权衡效应最强；③翔安区开发潜力最大，同安区过度城市化问题突出，市域未开发单元中生境质量、水源涵养和雨涝调蓄服务较强，建成单元仅在休闲游憩服务具有优势；④叠加空间细分单元的城市化与生态系统服务特征，得到厦门市生态管控分区和决策矩阵，提出四类单元八种情景的具体管控策略。     

A Robust Noninvasive Approach to Study Gut Microbiota Structure of Amphibian Tadpoles by Feces

The 16S rDNA amplicon high-throughput sequencing technique provides a robust and inexpensive approach to detect the gut microbiota of amphibians. Since different experimental protocols generate technical biases in drawing the gut microbiota profiles, the integrative analysis of gut microbiota produced by different studies must be performed with circumspection. In this study, we compared the efficacy of two DNA extraction methods(i.e., a phenol-chloroform method and TIANamp Stool DNA Kit) in describing intestinal and fecal bacterial communities of transplanted Asiatic toad(Bufo gargarizans) tadpoles. In terms of the DNA extraction quality(i.e., DNA purity and yield rate) and the consistency in between fecal and intestinal microbiota structures(i.e., α and β diversity indices), the phenol-chloroform method was more robust than this commercial stool kit in profiling gut microbiota of tadpoles with feces.     

具有非局部边界和局部化源抛物方程组解的全局存在与爆破性

这篇文章研究了局部化源和非局部边界条件的抛物方程组,讨论了局部源和非局部边界条件对于解局部存在,全局存在和全局爆破的影响,给出了局部存在,全局存在和全局爆破的充分条件.     

Replacement of bacteriopheophytin in reaction centers from Rhodobacter sphaeroides RS601 with plant pheophytin

In the presence of acetone and an excess of exogenous plant pheophytins,bacteriopheophytins in the reaction centers from Rhodobacter sphaeroides RS601 were replaced by pheophytins at sites HA and HB,when incubated at 43.5℃ for more than 15 min.The substitution of bacteriopheophytins in the reaction centers was 50% and 71% with incubation of 15 and 60 min,respectively.In the absorption spectra of pheophytin-replaced reaction centers (Phe RCs),bands assigned to the transition moments QX (537 nm) and QY (758 nm) of bacteriopheophytin disappeared,and three distinct bands assigned to the transition moments QX (509/542 nm) and QY (674 nm) of pheophytin appeared instead.Compared to that of the control reaction centers,the photochemical activities of Phe RCs are 78% and 71% of control,with the incubation time of 15 and 60 min.Differences might exist between the redox properties of Phe RC and of native reaction centers,but the substitution is significant,and the new system is available for further studies.     

人肺组织特性区域差异的实验方法初探

对非肺病因死亡的病人在24小时内解剖而得的人肺各叶进行了研究,以了解人肺组织弹性的区域性差异。人肺矩形薄片试件在二维试验机上进行试验。结果表明:在一定肺容量下,右上叶弹性模量为最大,依次为左上叶,右下叶,左下叶和右中叶。从增量模量观点看、人肺呈现相当大的区域差异。