牙鲆Lhx1基因的克隆和表达分析

<i>Lhx1i>基因对于哺乳动物卵巢缪勒氏管的形成具有重要作用, 但鱼类中的报道仅限于其在体轴和肾脏形成中的作用, 尚未见到其与性别及性腺发育相关的报道。本研究克隆获得了牙鲆(<i>Paralichthys olivaceusi>)<i>Lhx1ai>和<i>Lhx1bi>开放阅读框(ORF)序列, 长度分别为1224 bp 和1206 bp (GenBank 注册号为:JX999940、JX999941), 同源序列比较显示牙鲆<i>Lhx1ai>和<i>Lhx1bi>基因均具有两个LIM 及一个HOX 结构域, 符合<i>Lhx1i>进化保守性。这两个基因在牙鲆雌、雄成鱼各组织RT-PCR 差异表达谱不尽相同, <i>Lhx1ai>在精巢中弱表达, 卵巢中不表达, 在其他组织中雌、雄表达谱差异不大, 都只在脑和眼组织有弱表达;而<i>Lhx1bi>的表达在性腺中相对较高, 且卵巢的表达量高于精巢。进一步检测牙鲆<i>Lhx1ai>和<i>Lhx1bi>在雌、雄性腺发育各期的表达谱, 发现这两个基因表达集中于Ⅲ、Ⅳ期性腺, <i>Lhx1ai>在精巢中弱表达, <i>Lhx1bi>卵巢中的表达明显高于精巢, 而在Ⅰ、ⅡII、Ⅴ期性腺几乎均不表达。由此推断牙鲆<i>Lhx1ai> 和<i>Lhx1bi>均为性别相关基因, 但在两性性腺发育中的作用可能各有不同。     

电子政务空间辅助决策系统中数据库性能的优化

Oracle9i数据库系统是一个大型而复杂的运行系统,其运行效率对系统性能至关重要。本文从数据库结构、SQL语句和内存分配等三个方面对Oracle9i数据库性能的优化做了阐述,提出了一些原则和方法。     

Interspecies care and aging in a gorilla 2.0 world

Two key figures analyzed in Donna Haraway’s monograph, Primate Visions: Gender Race and Nature in The World of Modern Science (1989) warrant further analysis in the emerging cyber politics of environmental conservation. These figures are Koko, a female lowland gorilla born in the San Francisco Zoo and her companion Dr. Francine (Penny) Patterson, a developmental psychologist who taught Koko how to communicate with a modified form of American Sign Language (ASL). Nine years after Haraway’s initial analysis, Koko and Patterson became early examples of conservation-related Web 2.0 engagement with their unprecedented inter-species America Online chat room encounter with 7811 member participants. Today, Koko has a Twitter account (@kokotweets), a Facebook page, a YouTube channel and a website where users watch videos of Koko celebrating birthdays and donate to ‘distant’ conservation projects. One project site is a gorilla reserve in Cameroon and another is a former pineapple plantation turned private nature preserve in Maui, Hawai’i. Inspired by recent analytical work in animal geographies and feminist political ecology, this article explores complex landscapes of caring, aging and conservation in a time of proliferating social media engagement from colonized sites of enduring privilege. The article argues that new media adds layers of violence, disciplinary techniques and co-dependence to the aging bodies, caring practices and landscapes that Koko, Patterson and others inhabit in California and in the proposed physical spaces of a repurposed pineapple field in Maui.     

可地浸层间氧化带型砂岩铀矿自然电位异常计算

理论和实践表明，在可地浸层间氧化带型砂岩型矿床上可观察到明显的自然电位异常。其起因不同于电子导电体形成的氧化还原电场，而在于发生在层间氧化带中一些非平衡现象之间相互影响所产生的混合电位。根据其自然极化原理，建立了等效数学模型，并对几种常见矿体形态的自然电位异常进行了模拟计算，并分析了曲线特征。最后，讨论了自然电位异常地形校正方法，并给出了几种常见地形条件下自然电位模拟曲线。     

神府矿区活鸡兔矿井烧变岩水害防治工程研究

活鸡免矿井是神木北部矿区首批建设的现代化煤矿之一，于2000年12月投产，生产原煤800万t/a。由于该矿井范围内煤层上部（垂距21-30m）赋存有10.97km^2烧变岩裂隙含水层，其静储量高达130万m^3，单孔涌水量可达2000m^3/d，对煤矿的安全开采构成了巨大威胁。同时，烧变岩裂隙水双是可供矿区开发利用的宝贵水资源，为消除水害隐患及合理利用地下水资源，采用了钻孔泄水方式将烧变岩裂隙水引入矿区供水系统，既保证了矿井的安全生产，又取得了巨大的经济效益与环境效益。     

Beyond environmental impact: articulating the “intangibles” in a resource conflict

Environmental planning is an arena of policy making in which formal public deliberation is among the most extensive. At the same time, environmental disputes can also be among the most resistant to resolution, often becoming entangled in issues that some describe as “intangible”. The discourse is largely structured by regulatory frameworks, such as environmental impact assessment laws and procedures, which focus primarily on operational rights (what one can or cannot do where and when) and tangible impacts on the physical or natural environment. A comparative case study of mariculture in Hawai‘i reveals that a large measure of public concerns focused on collective choice rights (who has a right to make which decisions on behalf of whom) and the more intangible impacts to the social or cultural environment. These concerns are often nested in a historic context that has implications for the social processes that they create. The findings from this study imply a need for more structured or systematic ways to deliberate issues of collective choice rights alongside operational rights within the larger process of environmental planning.     

热液铀矿床中的红化问题

按红化与铀矿化形成的先后关系,将热液铀矿床(特别是碱交代型铀矿床)中的红化划分出三种成因类型:原生红化、同生红化和后生红化。其中后生红化又分为次生红化和表生红化。讨论了红化不同成因类型的可能形成机理:空洞效应导致原生红化;铁—铀氧化还原作用导致同生红化;辐射作用导致次生红化;O_2对Fe~(2+)的氧化作用导致表生红化。作出了在成矿热液所处的物理化学条件下铁—铀氧化还原反应的pH—Eh图和pH—PUO_2图。肯定了在成矿热液所处的物化条件下铁—铀反应的可能性。原生红化与矿化关系不大,它作为开放式碱交代的标志之一:同生红化与矿化关系密切;次生的红化可作为构成找矿标志的一个因素;表生红化意义不大。     

广东博罗县小金河植物区系研究

本区计有野生维管束植物１７２科、５３２属、９７８种（包括变种、变型）。发现２新种，１新变种和３个广东新记录种。本区系的表征科为山茶科、壳斗科、桑科、芸香科、紫金牛科、樟科等，这些科大都是热带－亚热带分布式的，代表了本区系的性质。在属的地理成分中，本区以热带成分１７３属（占总数的３５．２％）和热带－亚热带成分１６９属（占总数的３４．４％）为主，说明了本区系具有由亚热带向热带过渡的南亚热带特征。本区与     

Tsunami Warnings: Understanding in Hawai‘i

The devastating southeast Asian tsunami of December 26, 2004 has brought home the destructive consequences of coastal hazards in an absence of effective warning systems. Since the 1946 tsunami that destroyed much of Hilo, Hawai‘i, a network of pole mounted sirens has been used to provide an early public alert of future tsunamis. However, studies in the 1960s showed that understanding of the meaning of siren soundings was very low and that ambiguity in understanding had contributed to fatalities in the 1960 tsunami that again destroyed much of Hilo. The Hawaiian public has since been exposed to monthly tests of the sirens for more than 25 years and descriptions of the system have been widely published in telephone books for at least 45 years. However, currently there remains some uncertainty in the level of public understanding of the sirens and their implications for behavioral response. Here, we show from recent surveys of Hawai‘i residents that awareness of the siren tests and test frequency is high, but these factors do not equate with increased understanding of the meaning of the siren, which remains disturbingly low (13%). Furthermore, the length of time people have lived in Hawai‘i is not correlated systematically with understanding of the meaning of the sirens. An additional issue is that warning times for tsunamis generated locally in Hawai‘i will be of the order of minutes to tens of minutes and limit the immediate utility of the sirens. Natural warning signs of such tsunamis may provide the earliest warning to residents. Analysis of a survey subgroup from Hilo suggests that awareness of natural signs is only moderate, and a majority may expect notification <i>viai> alerts provided by official sources. We conclude that a major change is needed in tsunami education, even in Hawai‘i, to increase public understanding of, and effective response to, both future official alerts and natural warning signs of future tsunamis.     

IKONOS影像生产1：10000地理信息产品的研究

简要介绍了IKONOS卫星遥感影像适用于地理信息产品生产的特点，然后通过试验生产，并与传统的航片相比较，详细分析了利用IKONOS影像作为数据源生产1：10000基础信息产品在精度、生产流程、工作效率、生产周期、外业工作量和价格等方面的情况。