广西猫街自然保护区两栖动物资源调查及保护

2003年3~7月,对广西猫街自然保护区的两栖动物资源进行了调查。结果表明:该保护区有两栖动物16种,隶属12属6科2目;动物地理区划属东洋界华南区闽广沿海亚区滇桂山地丘陵省,区系组成以华中区与华南区共有种为主;生态类型以流水型和陆栖静水型种类占优势;保护区和同样地处桂西的大王岭自然保护区、岑王老山自然保护区的两栖动物群落相似系数较高,而与桂北地区的桂林漓江风景名胜区和桂南地区的挂榜山的相似系数最小。根据资源现状提出了保护对策。     

再论山东半岛和辽东半岛植物区系在区划中的地位

通过对山东半岛植物小区、辽东半岛植物小区、鲁中南低山丘陵植物小区和属于华北山地亚地区的北太行山_恒山植物小区属的相似性系数以及属的分布区类型的UPGMA分析, 结果表明 :山东半岛植物小区和鲁中南低山丘陵植物小区的相似性程度高, 关系近, 而辽东半岛植物小区与北太行山_恒山植物小区的相似性程度高, 关系近, 所以把山东半岛植物小区和辽东半岛植物小区划入同一个植物区系亚地区是不合理的, 建议把辽东半岛植物小区划归到华北山地亚地区, 原辽东、山东丘陵植物亚地区改名为山东丘陵植物亚地区。     

浅析荔波县五棓资源优势与利用

一、自然概况荔波县隶属黔南布依族苗族自治州,位于贵州南部(东经107°37′～108°18′,北纬26°7′～25°38′),东南、西南与广西环江、南丹县相邻,西北、东北与独山,三都、榕江、从江县毗邻。总面积3651038亩。地处黔桂台地斜向广西丘陵倾斜地带,地貌类型为亚热带岩溶化山系,其间与沙页岩形成的常态地貌由北向南呈条状分布,构成山地、丘陵,山间盆地、河谷盆地等。地形总趋势是北高南低,最高海拔1468米,最低300米。其间河谷起伏较大,纵横交错,地形破碎。土质以薄层黄色石灰土、石卡拉黄色石灰土、中厚层硅铝质黄壤、硅     

云南省思茅市蝴蝶拾零

思茅市位于我国云南省南部 ,西双版纳州以北 ,地处云贵高原南缘、横断山脉南段向南延伸形成的中山峡谷和盆地丘陵地带 ,地势北高南低 ,山峰海拔在 130 0～180 0 m之间 ,盆地、丘陵海拔在 80 0～ 130 0 m之间 ,澜沧江从思茅市西部流过。思茅市地处北回归线以南 ,气候类型属于南亚热带山地季风气候 ,年均气温约 18℃ ,年降雨量 10 0 0～2 0 0 0 mm。 5～ 9月为雨季 ,炎热多雨 ;10月至次年 4月为旱季 ,温暖干燥。思茅市地处南亚热带—北热带过渡地区 ,当地植被可以划分为思茅松林、常绿阔叶林、季雨林、混交林、竹林和灌草丛等 6种类型 ,常见高…     

广西黑熊资源调查及保护对策

2007-2008年采用样带法实地调查和分布区社会调查对广西的黑熊(Selenarctos thibetanus)资源进行调查.结果表明,广西的黑熊资源仅分布在桂北、桂西北和桂西南的部分山地林区,数量在112～157只左右,分布区面积约为5 629 km2.栖息地的丧失以及破碎化和大量的捕杀是野生黑熊资源长期生存的最大...     

基于地貌类型的中国东海大陆海岸带景观动态分析

基于东海地貌信息数据和6期景观数据,研究1990—2015年东海大陆海岸带地貌类型与景观动态变化特征,分析各地貌类型下景观格局时空分布规律。结果表明:(1)东海海岸带以丘陵地貌为主,其次是小起伏山地、平原、台地和中起伏山地。景观类型林地占主导,其次为耕地和建设用地。(2)平原、台地和丘陵地貌景观变化以耕地转为建设用地为主,小和中起伏山地则以草地转林地为主。(3)不同地貌单元下的景观变化剧烈程度依次为:平原台地丘陵小起伏山地中起伏山地,2005—2015年景观变化叠合度小于1990—2005年,景观变化剧烈程度下降。(4)地貌类型对景观分维数和稳定性指数影响差异较大,平原上水域分维数值最大,台地和丘陵耕地分维数最大,小起伏山地未利用地分维数最大,中起伏山地建设用地分维数最大,稳定性指数相反。耕地在海拔较低的地貌类型中趋于稳定,林地和草地多分布在海拔较高丘陵和山地,水域和建设用地在平原地区分维数最大,稳定性更强。     

不同立地条件‘凌丰’葡萄产量和品质调查分析

本文以‘凌丰’葡萄为试材,调查其在桂中、桂东南中试栽培点不同立地条件下的产量和果实品质。结果表明,在土壤肥力较好的桂东南中试点栽培,葡萄产量较高,果实品质较好;在土壤较瘠薄的桂中中试点栽培,土壤条件仅影响葡萄的长势与产量,而对葡萄品质影响不明显。由此提出在南方湿热地区栽培‘凌丰’葡萄的优质高产配套技术措施。     

广西栲树林分类的研究

以栲树为主的常绿阔叶林,在广西广泛分布于东部中亚热带地区海拔700 m以下红、黄壤丘陵山地,而且是这个区域最有代表性的地带性群落类型;在南亚热带和北热带山地也有小片分布。本文描述了广西常见的13个群丛,扼要地阐述了它们的地理分布、生境特点和种类组成。所有这些材料可作为其保护和科学管理的基础。     

广西栲树林分类的研究

以栲树为主的常绿阔叶林,在广西广泛分布于东部中亚热带地区海拔700 m以下红、黄壤丘陵山地,而且是这个区域最有代表性的地带性群落类型;在南亚热带和北热带山地也有小片分布。本文描述了广西常见的13个群丛,扼要地阐述了它们的地理分布、生境特点和种类组成。所有这些材料可作为其保护和科学管理的基础。     

广西栲树林分类的研究

以栲树为主的常绿阔叶林,在广西广泛分布于东部中亚热带地区海拔700 m以下红、黄壤丘陵山地,而且是这个区域最有代表性的地带性群落类型;在南亚热带和北热带山地也有小片分布。本文描述了广西常见的13个群丛,扼要地阐述了它们的地理分布、生境特点和种类组成。所有这些材料可作为其保护和科学管理的基础。     

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.     

Entwicklungsgeschichte und Ultrastruktur von Pollenkitt und Exine bei nahe verwandten entomophilen und anemophilen Angiospermensippen derAlismataceae,Liliaceae, Juncaceae,Cyperaceae, Poaceae undAraceae

Some closely related members of the monocotyledonous familiesAlismataceae, Liliaceae, Juncaceae, Cyperaceae, Poaceae andAraceae with variable modes of pollination (insect- and wind-pollination) were studied in relation to the ultrastructure of pollenkitt and exine (amount, consistency and distribution of pollenkitt on the surface of pollen grains). The character syndromes of pollen cementing in entomophilous, anemophilous and intermediate (ambophilous or amphiphilous) monocotyledons are the same in principal as in dicotyledons. Comparing present with former results one can summarize: 1) The pollenkitt is always produced in the same manner by the anther tapetum in all angiosperm sub-classes. 2) The variable stickiness of entomophilous and anemophilous pollen always depends on the particular distribution and consistency of the pollenkitt, but not its amount on the pollen surface. 3) The mostly dry and powdery pollen of anemophilous plants always contains a variable amount of inactive pollenkitt in its exine cavities. 4) A step-by step change of the pollen cementing syndrome can be observed from entomophily towards anemophily. 5) From the omnipresence of pollenkitt in all wind-pollinated angiosperms studied one can conclude that the ancestors of anemophilous angiosperms probably have been zoophilous (i.e. entomophilous) throughout.

     

Identification and Characterization of the First Equine Parainfluenza Virus 5

正Dear Editor,Parainfluenza virus 5 (PIV5), known as canine parainfluenza virus in the veterinary field, is a negative-sense,nonsegmented, single-stranded RNA virus belonging to the Paramyxoviridae family (Chen 2018). The virus was first reported in primary monkey kidney cells in 1954 (Hsiung1972), then it has been frequently discovered in various