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兴安盟山杏灌木草原的排序王晓江,章中,刘永军,章海波（内蒙古林业科学研究院,呼和浩特０１００１０）ＯｒｄｉｎａｔｉｏｎｏｆＰｒｕｎｕｓｓｉｂｉｒｉｃａＳｈｒｕｂ－ＳｔｅｐｐｅｓｉｎＸｉｎｇａｎＬｅａｇｕｅ,ＩｎｎｅｒＭｏｎｇｏｌｉａ￥ＷａｎｇＸｉａｏｊｉａｎｇ;ＺｈａｎｇＺｏｎｇ;ＬｉｕＹｏｎｇｊｕｎ;ＺｈａｎｇＨａｉｂｏ（ＩｎｎｅｒＭｏｎｇｏｌｉａＡｃａｄｅｍｙｏｆＦｏｒｅｓｔｒｙＳｃｉｅｎｃｅｓ,Ｈｕｈｈｏｔ０１００１０）．Ｃｈｉ－ｎｅｓｅＪｏｕｒｎａｌｏｆＥｃｏｌｏｇｙ,１９９３,１２（１）：２９－３２。ＴｈｅＰｒｕｎｕｓｓｉｂｉｒｉｃａｓｈｒｕｂ－ｓｔｅｐｐｅｓｉｎＸｉｎｇａｎＬｅａｇｕｅｏｆＩｎｎｅｒＭｏｎｇｏｌｉａａｒｅｓｔｕｄｉｅｄｕｓｉｎｇａｎｕｍｂｅｒｏｆｏｒ－ｄｉｎａｔｉｏｎｍｅｔｈｏｄｓ,ｉｎｃｌｕｄｉｎｇｐｏｌａｒｏｒｄｉｎａｔｉｏｎ（ＰＯ）,ｐｒｉｎｃｉｐａｌｃｏｍｐｏｎｅｎｔａｎａｌｙｓｉｓ（ＰＣＡ）ｏｒｄｉｎａｔｉｏｎａｎｄｃｏｒｒｅｓｐｏｎｄｅｎｃｅａｎａｌｙｓｉｓ（ＣＯＡ）ｏｒｄｉｎａｔｉｏｎ,２２ｐｏｌｔｓｏｆＰｒｕｎｕｓｓｉｂｉｒｉｃａｓｈｒｕｂ－ｓｔｅｐｐｅｓａｒｅｃ     

集约高产过程中土壤有机质动态初探

集约高产过程中土壤有机质动态初探崔玉亭,韩纯儒（北京农业大学,１０００９４）ＤｙｎａｍｉｃｓｏｆＳｏｉｌＯｒｇａｎｉｃＭａｔｔｅｒ（ＳＯＭ）ｉｎｔｈｅＰｒｏｃｅｓｓｏｆＡｇｒｉｃｕｌｔｕｒａｌＩｎｔｅｎｓｉｆｉｃａｔｉｏｎ￥．ＣｕｉＹｕｔｉｎｇ;ＨａｎＣｈｕｎｒｕ（ＢｅｉｊｉｎｇＡｇｒｉｃｕｌｔｕｒａｌＵｎｉｖｅｒｓｉｔｙ,１０００９４）．ＣｈｉｎｅｓｅＪｏｕｒｎａｌｏｆＥｃｏｌｏｇｙ,１９９３,１２（２）：３７—３８．Ｉｎｔｈｉｓｐａｐｅｒ,ｔｈｅｂａｌａｎｃｅｏｆｓｏｉｌｏｒｇａｎｉｃｍａｔｔｅｒ（ＳＯＭ）ｉｎｔｈｅｐｒｏｃｅｓｓｏｆａｇｒｉｃｕｌｔｕｒａｌｉｎｔｅｎｓｉｆｉｃａｔｉｏｎｉｎＣｈａｎｇｚｈｏｕｒｅｇｉｏｎｉｓｓｔｕｄｉｅｄａｎｄａｍｅｄｉｕｍ－ａｎｄｌｏｎｇ－ｔｅｒｍｐｒｅｄｉｃｔｉｏｎｏｆｉｔｓｄｙｎａｍｉｃｓｉｓｍａｄｅ。Ｔｈｅｒｅ－ｓｕｌｔｓｓｈｏｗｔｈａｔｄｕｒｉｎｇｔｈｉｓｐｒｏｃｅｓｓ,ｔｈｅｂａｌａｎｃｅｏｆＳＯＭｉｓｇｅｔｔｉｎｇｂｅｔｔｅｒ,ａｎｄａｆｔｅｒａｍｅｄｉｕｍｏｒｌｏｎｇｐｅ－ｒｉｏｄ（ｅ．ｇ,１０—２０ｙｅａｔｓ）,ｔｈｅＳＯＭｃｏｎｔｅｎｔｃａｎｇｅｔｔ     

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.