铁布自然保护区梅花鹿食物蕴藏量与负载量的测定

198 7年 2月至 2 0 0 1年 8月 ,对铁布自然保护区 (E1 0 2°5 8′～ 1 0 3°1 1′,N34°0 2′～ 34°1 2′)四川梅花鹿食物蕴藏量与负载量的野外调查结果表明 :四川梅花鹿的食物基地可划分为亚高山灌丛草甸、亚高山森林灌丛草甸、高山灌丛草甸、河谷灌丛草甸 4种类型 ,它们的食物生产力分别为 49 2 0g/m2 、 48 0 9g/m2 、 5 7 66g/m2 和 39 1 3g/m2 (干重 ) ,食物基地的总有效利用面积约为 37 79km2 ,食物理论蕴藏量为 1 989 44t,四川梅花鹿的平均日食量干重约为 3 61kg ,由此测算出保护区对鹿较适宜的理论负载量约为 45 0～ 75 0只 ,最大理论负载量为 1 5 0 0只左右。冬末春初 ( 2～ 4月 )食物的蕴藏量是限制该保护区鹿种群数量的关键因子。影响食物蕴藏量与负载量的因子有干旱、放牧和人类生产活动的干扰     

梧桐科植物在中国的地理分布

对中国梧桐科植物的地理分布进行研究 ,指出中国梧桐科植物的分布区 ,东起台湾的北部 (1 2 2°1 0′E) ,西至西藏的墨脱 (95°3 0′E ,2 9°2 0′N) ,北起河北的东陵和小五台山 (约 40°2 0′N) ,南达西沙群岛的永兴岛(约 1 6°1 0′N)。其分布范围主要在热带、亚热带 ,只有少数种类可分布到温带。主要根据《中国种子植物属的分布区类型》的划分原则 ,把中国梧桐科植物野生各属划分为 1 0个类型。且对中国梧桐科植物一些属的分布格局进行探讨。     

内蒙古巴彦淖尔盟蒙古野驴的数量、分布和保护对策

20 0 0年 7月中旬至 8月上旬 ,大批蒙古野驴从蒙古共和国进入我国内蒙古自治区巴彦淖尔盟乌拉特中旗和乌拉特后旗境内。 2 0 0 0年 9月对该地区蒙古野驴的数量、分布和保护情况等进行了考察 ,发现蒙古野驴主要活动在巴彦淖尔盟乌拉特中旗和乌拉特后旗中蒙边境沿线的梭形狭长地带。蒙古野驴活动区东端最南点在乌拉特中旗敦德乌素嘎查 (42°1 7′N ,1 0 8°3 0′E) ,距边境 2 3km ,西端最南点在乌拉特后旗乌力吉图嘎查以西 (42°0 8′N ,1 0 6°3 6′E) ,距边境 1 2km。活动区中部的南限在北纬 42°0 1′,距正北方边境 44km ,活动区面积约 5 3 80km2 。根据样带法调查计算估计该分布区蒙古野驴总数约在 1 1 40 0头左右。目前蒙古野驴种群在该地区的分布尚未完全稳定。密集的人口 ,有限的食物资源和偷猎是影响蒙古野驴种群在该分布区稳定生存的主要因素     

甘肃白水江国家级自然保护区的蛇类调查

笔者于91～92年7月初步调查了甘肃白水江国家级自然保护区(东经104°17′～105°25′、北纬32°36′～33°15′)的蛇类,采集标本30余号,经鉴定为2科12属18种(包括甘肃新纪录绞花林蛇1种),另有资料记载4属6种,共计2科16属24种,占甘肃蛇类的75%。     

历山保护区山斑鸠的繁殖习性

1997～ 1 999年的 4～ 9月 ,在山西省历山国家级自然保护区对山斑鸠 (Ｓｔｒｅｐｔｏｐｅｌｉａｏｒｉｅｎｔａｌｉｓ)的繁殖习性进行了观察 ,报道如下。1　工作区概况及方法山西历山国家级自然保护区位于中条山东段 ,地处翼城、沁水、阳城、垣曲 4县交界 ,东经 1 1 1°51′～ 1 1 2°3 6′ ,北纬 3 5°1 6′～ 3 5°2 7′ ,总面积 2 4 80 0ｈａ ,主峰历山海拔 2 3 2 1ｍ。本区系石质山地 ,为南缓北陡的单面山。森林繁茂 ,灌木丛生 ,水源充沛。属暖温带季风型大陆性气候 ,夏季炎热多雨 ,冬季寒冷干燥 ,年均温 8～ 1 0℃ ,无霜期 1 80～ 2 0 …     

武陵山区人类与环境的初步研究

武陵山区属湘鄂川黔四省交界的边缘地带,南北长330km,东西宽270km,界于109°05′—111°34′E,27°20′—30°08′N 之间,总面积39831.73km~2。共有33个县(市),476个乡     

湖南莽山自然保护区的水生维管束植物——多样性及其生境特征

莽山自然保护区位于湖南省宜章县境内 (2 4°52′0 0″～ 2 5°0 3′12″N,112°4 3′19″～ 113°0 0′10″E) ,属南岭支脉。作者对该地区水生维管束植物及其生境进行了考察 ,采集到水生沼生维管束植物30科 4 7属 6 7种 ,其中 30种为莽山地区新记录。在比较沼泽和湖泊水生植物群落结构特点的基础上 ,讨论了沼泽作为水生植物重要生境的意义 ,建议对作为珍稀濒危水生植物重要产地的长江以南山地沼泽采取有效的保护措施     

广东阳春鹅凰嶂自然保护区种子植物区系研究

鹅凰嶂自然保护区位于广东省阳春市境内 (1 1 1°2 1′2 9″～ 1 1 1°3 6′0 3″E ,2 1°5 0′3 6″～ 2 1°5 8′40″N) ,为北热带地区。计有维管植物 2 1 0科 75 4属 1 5 80种 (包括亚种与变型 ) ,其中种子植物有 1 72科 681属 1 44 8种。研究分析和讨论了本区主要植被类型、种子植物区系及珍稀濒危植物 ,其种子植物区系特征是 :种类组成比较丰富 ,地理成分复杂 ,联系广泛 ,以热带成分占绝对优势 ,是典型的热带北缘区系性质 ;植被类型以山地雨林为主 ;区系起源古老 ,原始类群丰富 ;特有性比较高 ,珍稀濒危植物明显。建议对一些濒危物种采取有效的保护措施。     

中国叶附生苔类植物的研究(八)——湖北后河自然保护区的叶附生苔类

湖北后河国家级自然保护区发现叶附生苔类 ,共 3科 7属 7种 ,它们分布在 30°5′32″N,110°33′10″E,海拔10 0 0～ 110 0 m之间的河谷常绿阔叶林内。最常见的种为叶生针鳞苔 Rhaphidolejeunea foliicola和尖叶薄鳞苔L eptolejeunea elliptica。这是叶附生苔类在湖北省的首次发现 ,也是目前我国叶附生苔类分布最北的记录。独特的气候条件和保存完好的常绿阔叶林为它提供了良好的生境     

南岳自然保护区爬行动物资源调查

为了调查清楚南岳自然保护区的自然资源概况 ,我们受南岳区政府的委托 ,组织综合考察队于2 0 0 0年 6月至 2 0 0 2年 6月对南岳自然资源进行了考察 ,现将自然保护区的爬行动物资源调查情况报告如下。1　自然概况　　湖南省南岳衡山是一座孤山 ,地处北纬 2 7°2 0′1 0″～ 2 7°1 9′40″,东经 1 1 2°3 4′2 8″～ 1 1 2°45′3 6″,南岳自然保护区总面积为 1 1 991 .6 hm2 ,山体连绵起伏 ,系中同地貌 ,最底海拔 80 m,最高海拔 1 2 89.8m。山脉呈北北东至南南西走向 ,由东北向西倾斜 ,坡度一般为 3 0°～ 40°,南端边缘悬崖地带坡度最大可…     

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     

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.     

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.     

Enterovirus 71 3C proteolytically processes the histone H3 N-terminal tail during infection

Highlights
1. The N-terminal tail of histone H3 is specifically cleaved during EV71 infection.
2. Viral protease 3C is identified as a protease responsible for proteolytically processing the N-terminal H3 tail.
3. Our finding reveals a new epigenetic regulatory mechanism for Enterovirus 71 in virus-host interactions.     

Detection of EBV and HHV6 in the Brain Tissue of Patients with Rasmussen’s Encephalitis

Rasmussen’s encephalitis (RE) is a rare pediatric neurological disorder, and the exact etiology is not clear. Viral infection may be involved in the pathogenesis of RE, but conflicting results have reported. In this study, we evaluated the expression of both Epstein-Barr virus (EBV) and human herpes virus (HHV) 6 antigens in brain sections from 30 patients with RE and 16 control individuals by immunohistochemistry. In the RE group, EBV and HHV6 antigens were detected in 56.7% (17/30) and 50% (15/30) of individuals, respectively. In contrast, no detectable EBV and HHV6 antigen expression was found in brain tissues of the control group. The co-expression of EBV and HHV6 was detected in 20.0% (6/30) of individuals. In particular, a 4-year-old boy had a typical clinical course, including a medical history of viral encephalitis, intractable epilepsy, and hemispheric atrophy. The co-expression of EBV and HHV6 was detected in neurons and astrocytes in the brain tissue, accompanied by a high frequency of CD8⁺ T cells. Our results suggest that EBV and HHV6 infection and the activation of CD8⁺ T cells are involved in the pathogenesis of RE.     

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).     

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.