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正封面照片为西南林业大学国家高原湿地研究中心陈广磊同学拍摄于玉龙雪山蓝月谷.玉龙雪山(100°4'2″—100°16'30″E、27°3'2″—27°18'57″N)位于云南省丽江市玉龙纳西族自治县,是北半球距赤道最近的现代海洋性冰川,面积455 km~2.玉龙雪山属南温带型高原季风气候区,由于河谷至     

青藏高原特有种黄绿卷毛菇的地理分布与生态环境的相关性

2008—2012年选择了中国青海、西藏、四川等22个地区,首次对青藏高原的特有真菌黄绿卷毛菇(Floccularia luteovirens)进行了全面、系统地调研,包括其地理分布、发生地的气候特征及其发生特征。研究结果表明:黄绿卷毛菇在我国的地理分布范围为纬度范围N 28°93'—37°69'、经度范围E 90°4'—102°1',主要是青藏高原地区;黄绿卷毛菇主要发生在夏秋(6—9月份),发生地的平均气温为6.2—15.9℃,平均相对湿度为41%—74%,年降水量为344—574 mm,年平均蒸发量为1393.8—2441.4mm,湿润系数为0.42—0.78。     

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正封面照片由江西师范大学地理与环境学院张宇婧于2017年8月拍摄."中国最冷小镇"呼中位于黑龙江省西北部大兴安岭地区(51°14'40″—52°25'00″N,122°39'30″—124°21'00″E),被称为"森林腹地,兴安之巅",海拔500～1000 m,四面环山,年平均气温-4.3℃,年均降水量497.7 mm,四季分明,属大陆性季风气候,素有中国偃松之乡、红毛柳之乡、黑木耳之乡的美誉.黑龙江呼中     

内蒙古鸟类新纪录——鸥鸽

<正>2014年12月2日,笔者在内蒙古自治区阿拉善盟额济纳旗进行全国第二次陆生野生动物资源调查期间,于达拉呼布镇东北7 km(101°11'51″E,42°06'38″N,海拔917 m)的农田发现约100只欧鸽Columba oenas正在休息;12月3日距此处北3 km左右的引水渠(101°11'23.96″E,42°06'47.50″N,海拔921 m)发现约150只欧鸽,多数个体在取食、饮水,少数在飞翔。2017年3月21日—5月30日,笔者在达来呼布镇多处(101°0'55.17″E,42°04'18.05″N;101°10'27.28″E,41°59'3.29″N;101°09'54.72″E,     

西双版纳尚勇自然保护区哺乳动物物种多样性

正尚勇自然保护区位于云南省西双版纳勐腊县南部,地理位置21°13'30'–21°24'48'N,101°22'48'–101°37'30'E,为1980年西双版纳自然保护区调整后新增保护区域。总面积31,184 ha,其中核心区面积18,199 ha,缓冲区面积6,736 ha,实验区面积6,249 ha(杨宇明和唐芳林,2008)。过去几十年的人为干扰使得西双版纳热带雨林破碎化程度加剧,哺乳动物多样性呈现逐渐降低的趋势(PuZhang,2001;Li et al,2009)。近年来在     

湖南壶瓶山发现白喉针尾雨燕和乌嘴柳莺

正2013年9月13日,在湖南壶瓶山国家级自然保护区(以下简称壶瓶山保护区)壶瓶山主峰(30°06'53.2″N,110°47'14.7″E,海拔2 099 m),观察到2只白喉针尾雨燕(Hirundapus caudacutus)。2013年9月23日、24日,先后又在顶坪瞭望塔上(30°02'57.6″N,110°31'22.6″E,海拔1832 m)、神景洞碑垭(30°03'34.9″N,110°31'22.6″E,海拔1711 m)共观察到8只白喉针尾雨燕。白喉针尾雨燕在中国主要分布于黑龙江、吉林、辽宁、内蒙古、河北、青海、西藏、四川、贵州、云南以及台湾(赵     

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正图片由山西省农业科学院高粱研究所张福耀研究员于2015年9月9日拍摄于内蒙古自治区赤峰市敖汉旗.敖汉旗位于燕山山脉东段努鲁尔虎山北麓,科尔沁沙地南缘,地处41°42'—43°02'N,119°30'—120°53'E.东临通辽市奈曼旗,西接朝阳市建平县,南与北票市、朝阳县相连,北与赤峰市翁牛特旗隔老哈河相望.敖汉是远近闻名的农业大县,粮食作物主要有玉米、高粱、谷子、水稻、小麦和杂豆,年产量超过6亿kg,是国家商品粮基地和内蒙古自治区产粮十强旗县之一,也是赤峰市境     

云南兽类鼠科一新纪录——南洋鼠

正中国科学院昆明动物研究所哺乳动物生态与进化学科组于2014年9月20日在云南省西双版纳傣族自治州景洪市勐龙镇勐宋村(北纬21°30'00″,东经100°29'24″,海拔1 604 m)附近的常绿阔叶林中使用sherman捕获两号疑似费氏树鼠属标本。通过形态学鉴定结合分子遗传比较,确定这两号标本为南洋鼠(Chiromyscus langbianis)。     

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正封面照片为北京林业大学自然保护区学院卜祥祺同学拍摄于乌兰哈达火山群遗址.乌兰哈达火山群遗址(113°01'—113°32'E,41°26'—41°38'N)位于内蒙古自治区察哈尔右翼后旗乌兰哈达苏木境内,地处蒙古高原南缘,地势高山平原相间,丘陵沟壑交错.该地区位于北半球中纬度地带,     

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正封面图片由中国科学院水利部水土保持研究所樊军研究员和牛小桃拍摄于中国科学院水利部水土保持研究所神木侵蚀与环境试验站.试验站位于六道沟流域(38°46'—38°51'N、110°21'—110°23'E),处于黄土高原水蚀风蚀交错带,土壤侵蚀严重,是典型的生态脆弱区,强烈的水蚀风蚀     

Curcuminoids as inhibitors of thioredoxin reductase: A receptor based pharmacophore study with distance mapping of the active site

Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable potent antiproliferative synthetic drugs.     

A Unique Protease Cleavage Site Predicted in the Spike Protein of the Novel Pneumonia Coronavirus (2019-nCoV) Potentially Related to Viral Transmissibility

正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases     

Comparative morphology of the carpel in the Liliaceae: Hewardieae, Petrosavieae, and Tricyrteae

The young pistils in the melanthioid tribes, Hewardieae, Petrosavieae and Tricyrteae, are uniformly tricarpellate and syncarpous. They lack raphide idioblasts. All are multiovulate, with bitegmic ovules. The Petrosavieae are marked by the presence of septal glands and incomplete syncarpy. Tepals and stamens adhere to the ovary in the Hewardieae and the Petrosavieae but not in the Tricyrteae. Two vascular bundles occur in the stamens of the Hewartlieae and Tricyrtis latifolia. Ventral bundles in the upper part of the ovary of the Hewardieae are continuous with compound septal bundles and placental bundles in the lower part. Putative ventral bundles occur in the alternate position in the Tricyrteae and putative placental bundles in the opposite. position in the Petrosavieae. The dichtomously branched stigma in each carpel of the Tricyrteae is supplied by a bifurcated dorsal bundle.     

鸡传染性法氏囊病病毒研究进展

传染性法氏囊病(Infection bursal disease, IBD)是由鸡传染性法氏囊病毒(Infectious bursal disease virus, IBDV)引起的鸡和火鸡的一种高度接触性传染病,给世界各国的禽养殖业带来了巨大损失.自IBDV发现至今新的变异株不断出现,分子结构的改变导致病毒致病力的改变及宿主对疫苗应答的改变,使得传统的疫苗已不能控制其流行,因此各国学者对其基因组结构和功能进行了广泛深入的研究,并积极研制新型有效的疫苗以达到防治的目的.     

Development of a Novel Reverse Transcription Loop-Mediated Isothermal Amplification Method for Rapid Detection of SARS-CoV-2

In conclusion, the novel visual RT-LAMP assay is a simple, rapid, and sensitive approach for detection of SARS-CoV-2, and it is ready for application in primary care and community hospitals or health care centers, and even patients' own houses in response to the current SARS-CoV-2 epidemic because the assay does not require sophisticated equipment and skilled personnel. Furthermore, it is also ready to be used in fields for screening samples from wild animals and environments to facilitate the identification of potential intermediate hosts that mediate the cross-species transmission of SARS-CoV-2 from bats to humans.     

Perinatal Vertical Transmission of Chikungunya Virus in Ruili,a Town on the Border between China and Myanmar

正Dear Editor,Chikungunya virus (CHIKV), an arbovirus in the family of Togaviridae, genus Alphavirus, is transmitted by the A.aegyptii or A. albopictus mosquito, and causes disease in humans characterized by fever, rash, and arthralgia (Silva and Dermody 2017; Suhrbier 2019). It was first reported in 1953 in Tanzania, and caused only a few outbreaks and sporadic cases in Africa and Asia in last century. However, in the epidemic in 2004, CHIKV acquired mutations that conferred enhanced transmission by the A. albopictus mosquito(Schuffenecker et al. 2006). Since then, it has successively caused outbreaks in Africa, the Indian Ocean, South East Asia, the South America, and Europe (Zeller et al. 2016).