井冈山毛竹病斑表面可培养真菌的分离及多样性研究

为了解毛竹表面病害可培养真菌的多样性,采用组织分离法对井冈山毛竹病斑表面真菌进行了分离,并对其ITS-r DNA序列进行系统发育分析,同时研究了其多样性.结果表明:所分离的30株真菌可归属于12个属,以链孢霉属Fusarium(占比20.00%)、交链孢属Alternaria(占比13.33%)和赤霉属Gibberella(占比10.00%)为优势类群,多样性指数的计算反映出所获得的毛竹表面真菌菌群具有不同的丰富度及均匀度.     

丹参酮IIA与雷洛昔芬联合用药对大鼠前列腺增生防治作用的实验研究

良性前列腺增生(BPH)是引起老年男性排尿障碍的常见疾病.本研究在雌雄激素诱导大鼠前列腺增生模型基础上,探究丹参酮IIA与雷洛昔芬联合用药对大鼠前列腺增生的防治作用.结果表明,与模型组相比,丹参酮IIA与雷洛昔芬联合用药显著抑制大鼠前列腺体积增大,降低前列腺指数,同时减少前列腺上皮和间质细胞中雄激素受体(AR)和雌激素受体α(ERα)的表达;与单独用药组相比,联合用药的治疗作用显著优于单独用药.提示,在大鼠前列腺上皮和间质细胞中,丹参酮IIA与雷洛昔芬联合用药可能通过同时降低细胞中AR和ERα表达抑制细胞增殖.     

平顶山市白龟湖湿地沉积物有机污染状况及来源解析

以平顶山白龟湖湿地公园为研究对象,在研究区域布设了10个采样点,共采集29个沉积物样品,对其有机碳(TOC)、有机氮(TON)的含量进行测定和评价,同时对有机物来源进行简单分析.结果表明,沉积物中TOC含量变化范围为0.005 17%~9.602%,平均2.733%,TON含量变化范围0.014 50%~0.276 1%,平均0.101 0%,总体来说,沉积物中TOC含量随着沉积深度的增加而减小,TON含量随土深的增加而减小,C/N为6.9~75.4,平均值为24.8,沉积物中有机污染主要来源为外部来源.     

Analysis of one million base pairs of Neanderthal DNA

Neanderthals are the extinct hominid group most closely related to contemporary humans, so their genome offers a unique opportunity to identify genetic changes specific to anatomically fully modern humans. We have identified a 38,000-year-old Neanderthal fossil that is exceptionally free of contamination from modern human DNA. Direct high-throughput sequencing of a DNA extract from this fossil has thus far yielded over one million base pairs of hominoid nuclear DNA sequences. Comparison with the human and chimpanzee genomes reveals that modern human and Neanderthal DNA sequences diverged on average about 500,000 years ago. Existing technology and fossil resources are now sufficient to initiate a Neanderthal genome-sequencing effort.     

利用黑曲霉和酵母共发酵秸秆产乙醇的研究

利用黑曲霉降解秸秆的效果,黑曲霉和酵母共发酵条件的优化以及在最优条件下产乙醇的效果.从秸秆腐殖质土中筛选出9株黑曲霉,并用刚果红鉴别培养基筛选出水解圈比较大的两株菌,从pH、温度、发酵时间对两株菌进行产纤维素酶的优化,并将黑曲霉和酵母在最适条件下共发酵生产乙醇.最后得出pH=5,温度为32℃,发酵时间为72h时酶活最高,液体发酵在上述适宜条件下降解秸秆72h后接种酵母进行共发酵24h,生产出乙醇,质量比是3%.     

地理信息服务领域的实体自动化识别

针对地理信息服务领域(Geographic Information Services,GIServices)在实体自动识别方面存在缺乏语料、多种实体嵌套、语义稀疏等问题,本文设计了一套地理信息服务文献实体标注规范,构建了地理信息服务领域的语料;在传统实体识别模型BiLSTM-CRF的基础上,引入了BERT(Bidire...     

Bi—Sr—Ca—Cu—O系超导电性的探讨

用固态反应法制备不含稀土元类的BiSrCaCu_2Oy陶瓷高温超导体。该系统可能存在多个高温超导相,不同工艺可改变各超导相成份;150K附近可能有一更高温超导相。     

稻壳糟蛋白饲料的研究

本文报道利用热带假丝酵母(Candida tropicalis 2.637)以固体糟为底物,在发酵料中加入锌终浓度15ppm、钼20ppm,稀土元素0.1％,尿素2％时,30℃培养48小时后,粗蛋白含量由本底20.93％提高到36.21％。     

软件过程领域本体的构造

针对目前软件过程领域知识缺乏明确统一的表示、不同组织构造的过程模型缺少互操作性而难以共享和重用的情况,划分并描述了软件过程的顶层本体;在此基础上,对其中包含的任务描述、过程模型和过程实施与改进三个核心本体分别进行了展开和细化,给出了涉及到的关键概念的形式化定义.传统的本体系统并不适宜描述动态过程,因此使用谓词逻辑定义了过程本体中概念间的基本关系,以此来表示和描述软件过程模型的“柔性”和动态知识,使不同的参与者易于交流而达成共识,为构造可共享、易重用的过程模型元模型提供坚实、统一的基础.     

Charging Station Planning for Plug-In Electric Vehicles

A novel model for the charging station planning problem of plug-in electric vehicles is proposed in this paper considering the users’ daily travel. With the objective of minimizing the total cost, including the charging stations’ cost (including installing cost and management cost) and the users’ cost (including station access cost and charging cost), the proposed model simultaneously handles the problems where to locate the charging stations and how many chargers to be established in each charging station. Considering that different users may have different perception of station access cost and charging cost, two cases (i.e., homogeneous users and heterogeneous users) are typically investigated. The impacts of different discount rates, operating period of the charging stations, number of electric vehicles and number of charging stations on the location of the charging station are also studied. The simulation results not only show that it is very important to locate the charging stations according to the traveling behavior of users, but also verify the validity of the proposed model.