走进红松洼

正红松洼国家级自然保护区位于河北省围场满族蒙古族自治县境内,地理坐标为北纬42°10′~42°2 0′,东经117°18′~117°35′。保护区北与内蒙古克什克腾旗接壤,西与河北省塞罕坝机械林场交界,南部与东部范围包括了围场县的姜家店乡、山湾子乡和三义永乡。历史上,红松洼保护区所在的坝上草甸是大清国皇家狩猎     

改造农田小生境,增加天敌,抑制病虫

湖北省郧阳地区位于东经109°50′—111°50′,北纬31°30′—33°25′之间,处在世界陆地动物古北界与东洋界混合地带的西沿中部,利于这两界的天敌昆虫交互来往和生息繁衍。该地区又是我国东部平原西部山区过渡阶梯的典型地段,西北和西南山岭高竣重叠,海拔2,500米以上的山峰有7座,最高的达3,054米,阻挡了北来的冷空气。全年大风日数在10天以内,大风强度一般为5—7级,是湖北省大风日数最少、强度最弱的地区之一。风小既便于南下北上的天敢昆虫落脚     

赣南翼手类初步调查

赣南地区包括江西省抚州地区、吉安地区和赣州地区,约介于北纬24°29′—28°43′、东经113°46′—117°20′,面积约9万平方公里。东邻福建,西接湖南,南毗广东,北与本省九江和宜春地区相连;三面环山,地貌南向北逐渐低平形成中部的盆地。境内以低山、丘陵为主。亚热带季风气候显著。 为了对江西省翼手类区系有较完整的了解,我们在《兽类学报》第7卷第1期上发表《赣北翼手类调查》之后,自1985—1986年底,先后在吉安、泰和、遂川、宁冈、井岗山、永丰、赣州、瑞金、会昌、安远、寻乌、龙南、崇义、抚州、资溪、南丰、南城、宜黄和广昌等19个市、县进行翼手类调查。采集     

牯牛降自然保护区

牯牛降风景优美,景观独特,集“奇松、怪石、云海、佛光、飞瀑”五绝于一身。它位于安徽南部徽州地区的石台县与祁门县的交界之处,介于东经117°20′至117°37′,北纬30°00′至30°14′之间,其东能见黄山隐隐,北可望长江悠悠,是安徽大地上一颗神秘而璀灿的绿色明珠。 牯牛降,古代也曾称“黄山”或“西黄山”,     

甘肃陇东雉科鸟类数量变动及其保护的建议

陇东位于甘肃省东部,地处东经105°21′－108°40′、北纬34°50′－37°10′,辖12个县市,总面积3．45万km2。东起子午岭,西接六盘山,北连羊圈山,四周高而中间低,故有“陇东盆地”之称。这里的雉科鸟类已知有5属5种。我们于1984－1985年和1994－1995年对其中4种雉鹑的数     

黄海近岸海域短吻红舌鳎夏季产卵场的空间分布及其年际变化

根据2014年夏季、2016年夏季与2017年夏季3个航次的黄海近岸海域产卵场调查数据,采用服从Tweedie分布的广义加性模型(GAM),对黄海近岸海域短吻红舌鳎产卵场的空间分布及其年际变化进行了研究。结果表明: 短吻红舌鳎的产卵场主要分布在海州湾(34°00′—35°18′ N,119°30′—121°30′ E)、苏北浅滩(32°18′—34°00′ N,120°18′—122°00′ E)海域范围内,而山东半岛南部海域(34°42′—36°48′ N,119°30′—122°00′ E)鱼卵数量较少。短吻红舌鳎产卵场的空间分布与经纬度、水深及海水表层温度均显著相关,与海水表层盐度、表层叶绿素a相关性不显著;其最适水深、海水表层温度、海水表层盐度、表层叶绿素a浓度范围分别为15～26 m、29～32 ℃、22～25和0.10～3 mg·m^-3。短吻红舌鳎产卵场的空间分布及其影响因子存在一定的年际变化,总体上其产卵场分布较为稳定,但表层温度较高的年份可能存在北移的趋势。     

新疆库鲁克塔格南坡帕尔岗塔格群的叠层石

一、前言库鲁克塔格为东天山南支,自穹塔格沿塔里木盆地东北缘延至库尔勒西,地理座标位于东经85°—91°,北纬40°40′—41°20′之间。此区交通方便,居民点稀少。(插图1) 库鲁克塔格地区青白口系是否存在,一直是引人注目的地质问题。笔者于1976年和     

封面说明

正封面图片由中国科学院新疆生态与地理研究所彭庆文硕士2019年6月拍摄于新疆维吾尔自治区巴音郭楞蒙古自治州境内的开都河流域(82°58′—87°65′ E,41°62′—43°51′ N)上游区。开都河发源于天山中部,河流流向自东向西,径流以冰川融雪、地下水补给、降水3种来水方式为主,是塔里木河流域的重要源流之一,也是开都河流域水源涵养和水土保持的重要生态区域。开都河流域面积约为47.8×10~3 km~2,流域内开都河全长560 km。     

赣西北官山自然保护区鱼类资源研究

九岭山是位于江西省西北部东（北）-西（南）走向的一个相对独立的山脉,与赣、鄂边境的幕阜山平行,共同组成了长江中游赣、鄂、湘三省之间的“生态孤岛”——屹立于鄱阳湖平原、江汉平原和洞庭湖平原等三大平原之间的“孤岛”,这个“孤岛”对长江中游生物多样性保护具有极为重要的意义。     

庐山自然保护区及其自然资源特点

庐山自然保护区,于1981年1月1日经江西省人民政府批准建立。是以亚热带森林生态系统及自然历史遗迹为主要保护对象的综合性自然保护区。 1 地理位置庐山自然保护区位于江西省北部九江市南部,东南临鄱阳湖,西北滨长江。地理座标在东经115°51′～116°07′,北纬29°30′～29°41′。包括庐山管理局全     

Recent advances in the study of Kaposi's sarcoma-associated herpesvirus replication and pathogenesis

It has now been over twenty years since a novel herpesviral genome was identified in Kaposi's sarcoma biopsies. Since then, the cumulative research effort by molecular biologists, virologists, clinicians, and epidemiologists alike has led to the extensive characterization of this tumor virus, Kaposi's sarcoma-associated herpesvirus(KSHV; also known as human herpesvirus 8(HHV-8)), and its associated diseases. Here we review the current knowledge of KSHV biology and pathogenesis, with a particular emphasis on new and exciting advances in the field of epigenetics. We also discuss the development and practicality of various cell culture and animal model systems to study KSHV replication and pathogenesis.     

The structure, reproduction and taxonomy of Vidalia and Osmundaria (Rhodophyta, Rhodomelaceae)

Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera.     

New or rare chromosome counts in Artemisia L. (Asteraceae, Anthemideae) and related genera from Kazakhstan

Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted.     

肝癌中HBV和HCV基因和抗原的分布及意义

采用原位分子杂交方法检测HCV RNA及HBV X基因;采用免疫组织化学方法研究HCV核心抗原,非结构区C33c抗原及HBxAg在肝细胞肝癌中的定位及分布.结果表明(1)HCV RNA、HBV X基因在肝细胞肝癌组织检出率分别为40%(55/136)和82%(112/136).HCV RNA定位于癌细胞的胞浆内,阳性细胞呈散在、灶状及弥漫分布三种形式;HBV X基因在肝癌细胞中的分布呈胞浆型、核型及核浆型,阳性细胞也呈上述三种分布形式;(2)HCV C33c抗原、核心抗原在肝细胞肝癌中的阳性率为81%(133/164)及86%(141/164).C33c抗原定位于癌细胞及肝细胞的胞浆内;核心抗原既定位于癌细胞核中,又可定位于胞浆中.C33c抗原阳性细胞以灶状分布为主;而核心抗原阳性细     

Selection with two alleles and complete dominance

For a plant selection model with frequency-independent viabilities, fertilities and selfing rates, it is shown that apart from global fixation, for certain parameter combinations a protected polymorphism and facultative fixation (either allele may become fixed according to initial frequencies) may both occur. Facultative fixation requires different selling rates for the dominant and recessive type. Protection of the polymorphism requires resource allocation for male and female function. In this connection the problem of purely genetically caused population extinction is discussed.
For general frequency dependence and regular segregation, the chances for establishment of a completely recessive gene are compared to those of a completely dominant gene. It is proven that the process of establishment of the recessive gene, despite a fitness advantage, may be considerably endangered by drift effects if random mating prevails. The recessive gene may reach the same effectivity in establishment as a dominant gene, only if the recessive homozygote mates exclusively with its own type during the period of establishment.