芒果象甲研究进展(鞘翅目:象虫科)

本文对芒果象属 (SternochetusPierce,1 91 7)的种类、分布、生物学特性、生长季节的防治和采收后的处理等问题进行了总结 ,并对我国进行芒果象的检疫问题提出了建议。     

景谷芒果老果园更新改造的试验研究

本试验旨在针对１个早衰低产、行将淘汰的芒果老果园进行几种更新改造模式的探索性试验,以为景谷全县现存数万株芒果老果树的更新复壮作出示范和提供科学依据。自１９９１年采果后,对此１０ｈｍ＾２２０６４株的老果园分别采取轻度更新、隔行更新、强度更新与轻度修剪４种模式,并使命以其它农艺措施（定期防治病虫害、坡改台、增施肥料）加强管理。在原有大芒果树仅保留１１００株的情况下,１９９３年全园总产量达４４３６０ｋｇ     

紫花芒果后熟过程中主要类胡萝卜素含量的变化

紫花芒果后熟过程中主要类胡萝卜素含量的变化周玉蝉,唐友林,谭兴杰（中国科学院华南植物研究所广州５１０６５０）关键词：总类胡萝卜素;α－胡萝卜素;β－胡萝卜素;叶黄素;芒果芒果以富含维生素Ａ原——卜胡萝卜素而著称,而果实中类胡萝卜素含量的变化与芒果后熟...     

可食植物涂料对芒果后熟软化及采用病害的影响

“紫花”芒果采用后可食植物油,蜡、淀粉、碎粉处理,结果表明,向日葵油,竹柏油和霍霍巴蜡处理有推迟果实后熟软化和降低果实失重率的作用,显著减少炭疽病的发生,淀粉处理果实和对照果实后软化速度没有明显差异,但木薯淀粉和云苓碎粉处理果实,炭疽病严重程度明显减轻。除向日葵油之外,所用的各种涂料处理均有增加芒果蒂腐病发生的不良影响,向日葵油,竹柏油的霍霍巴蜡处理后９￣１２天,果肉略带不快异味。     

打孔注药法防治芒果壮铗普瘿蚊试验

芒果壮铗普瘿蚊（Procontarinia robustaLi,Bu＆Zhang）是新发现的危害厦门市园林绿化主要树种芒果的一种新害虫。该虫主要危害叶片,在芒果叶面上隆起形成虫瘿,严重影响城市园林绿化景观。在厦门芒果主要种植在城市主干道、公园、小区、机关单位和学校等地方,该树种树形高大,喷雾法用药量大,操作困难且对空气造成污染。选用几种具有内吸、上下输导作用的药剂（10％吡虫啉可湿性粉剂、16％虫线清、蚧诛净等）在树干基部打孔注药,发现芽前注药明显优于芽后注药。处理后虫口减退率都在90％以上,能较好地控制芒果壮铗普瘿蚊的虫口密度。     

几个芒果品种的胚性及多胚苗遗传分析

通过目测,筛选出芒果多胚种子,观察其多胚形态;将多胚种子培育成多胚苗,观察其生长发育状况;取多胚苗和母树叶片进行体细胞染色体数目鉴定及同工酶的分析.结果表明,多胚类群的品种中有单胚现象出现,土芒、吕宋、象牙单胚出现的频率分别为1.04%、3.85%和5.44%;土芒和象牙胚数出现的范围分别为2-6和2-8.多胚种子子叶形态和胚轴的着生位置各异.种子多胚的萌发率、成活率及多胚苗的生长状况均与多胚种子的胚数、子叶发育大小等因素相关.多胚苗体细胞染色体数目是2n=40,未发现染色体的数目变异.POD同工酶分析表明,同一种子的多胚苗间酶谱上存在着差异.     

Recent advances in the study of Kaposi's sarcoma-associated herpesvirus replication and pathogenesis

It has now been over twenty years since a novel herpesviral genome was identified in Kaposi's sarcoma biopsies. Since then, the cumulative research effort by molecular biologists, virologists, clinicians, and epidemiologists alike has led to the extensive characterization of this tumor virus, Kaposi's sarcoma-associated herpesvirus(KSHV; also known as human herpesvirus 8(HHV-8)), and its associated diseases. Here we review the current knowledge of KSHV biology and pathogenesis, with a particular emphasis on new and exciting advances in the field of epigenetics. We also discuss the development and practicality of various cell culture and animal model systems to study KSHV replication and pathogenesis.     

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.     

Synthesis and antimicrobial studies of hydrazone derivatives of 4-[3-(2,4-difluorophenyl)-4-formyl-1H-pyrazol-1-yl]benzoic acid and 4-[3-(3,4-difluorophenyl)-4-formyl-1H-pyrazol-1-yl]benzoic acid

Microbial resistance to antibiotics is an unresolved global concern, which needs urgent and coordinated action. One of the guidelines of the Centers for Disease Control and Preventions (CDC) to combat antibiotic resistance is the development of new antibiotics to treat drug-resistant bacteria. In our effort to find new antibiotics, we report the synthesis and antimicrobial studies of 30 new pyrazole derivatives. These novel molecules have been synthesized by using readily available starting materials and benign reaction conditions. Some of these molecules have shown activity with MIC values as low as 0.78?µg/mL against four bacterial strains; Staphylococcus aureus, methicillin-resistant S. aureus, Bacillus subtilis, and Acinetobacter baumannii. Furthermore, active molecules are non-toxic to mammalian cell line.