山东白头鹎的一些生态观察

据记载白头鹎Pycnontus sinensis的分布区,北至山东南部郯城(东经118°17′—118°40′、北纬34°251—34°57′)……。1984—1988年作者在山东省泰山(东经117°5′—117°24′、北纬36°5′—36°75′)、徂徕山(东经117°16′—117°20′、北纬36°02′—36°07′)的连续观察和冬季采到的标本,得知此鸟在上述两地为留鸟。常在海拔500米以下的低山一带活动,多停落在树的     

中国地衣两新记录

<正>Hebei Province lies in 36°04′-42°40′N and 113°27′-119°50′ E,covering an area of 187,700km2.The hilly area and plateau represent 57% of the total area.The lichen flora of this province is still inadequately known,and only 82 species     

胶东海岸的沙生植被

胶东半岛位于山东省东部,地处黄、渤海之滨,陆地海岸线全长1668.58km,占山东省陆地海岸线总长的一半以上。海岸地理位置约当北纬36°15′42″—38°24′00″,东经119°33′00″—122°42′18″之间,属暖温带生     

黑龙江省又发现一个新的丹顶鹤繁殖地

哈拉海湿地位于松嫩平原西北端,黑龙江省龙江县西北部,123°12′～123°35′Ｅ,47°36′～47°40′Ｎ。总面积为24000ｈｍ2。区内湖泡遍布,最大一个湖泡面积近2000ｈｍ2。沼泽类型主要为芦苇沼泽,面积超过10000ｈｍ2。区内无任何居民点,每年只有少数渔民在此捕鱼。因此,本...     

奥陶纪三叶虫Omeipsis zhenxiongensis Luo,1974的新材料

对滇东镇雄羊场桃子崖(北纬27°36′53″, 东经104°37′42″)和芒部刘家沟(北纬27°36′22″, 东经104°52′30″)早奥陶世晚期湄潭组下部所产Omeipsis zhenxiongensis Luo, 1974新材料作了研究,得以揭示Omeipsis Kobayashi, 1951的完整形态特征.该属除尾部具有一长一短两对边缘刺外,其头鞍向前逐渐扩张并发育有粗壮前刺.Renhuaia Yin in Yin and Li, 1978应为Omeipsis的晚出异名,因为两者头盖并无显著差异.     

陇西山自然保护区考察记

陇西山自然保护区位干福建省将乐县西南部,界于东经117°13′—117°21′、北纬26°30′——26°36′之间,地处武夷山脉向东延伸的支脉,总面积约为63.5平方公里。区内平均海拔约800米,主峰十字坳海拔1620米。这里属于亚热带季风性气候,境内多山,云雾多,湿度大,植物种类丰富,区系成分复杂。1988年划为省级自然保护区,1991年中国科     

“蓝田人”年代的古地磁学研究

世界闻名的“蓝田人”的时代,过去根据地层、古生物、地貌以及化石本身形态特征,一般估计为前五十万年左右。 1976年我们用古地磁方法对含“蓝田人”化石地层的年代进行了研究。研究结果:陈家窝猿人下颌骨化石的年代为前65万年左右。公王岭猿人头盖骨化石的年代在前75—80万年之间。正极性期的极位置在北纬76°24′,东经39°42′。信任角a为7°36′。负极性相的极位置在北纬84°18′,西经49°30′。信任角a为14°。     

攀枝花苏铁

1971年,四川省林科所和飞播林场进行植被考查时,发现大片自然苏铁林,地理座标是东经101°33′30″～101°35′38″,北纬26°36′58″～26°38′33″。分布总面积约300多公顷,约12万株,集中在攀枝花市巴关河民政、平江一带,海拔1100～1500m的石灰岩山地、稀树草丛地带,定名为攀枝花苏铁(Cycas Panzhihuaensis)。     

香港陆生脊椎动物简介

香港陆生脊椎动物简介徐延恭李迪强（中国科学院动物研究所北京１０００８０）香港（２２°９′－２２°３７′Ｎ,１１３°５２′－１１４°３０′Ｅ）由大陆的一角、九龙半岛及其邻近的岛屿组成,陆地总面积达１０７８ｋｍ２。它曾是覆盖着茂密常绿林和半常绿林的世外桃...     

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%。     

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.