钱学森的草产业理论与社会主义新牧区建设

根据钱学森提出的知识密集型草产业理论,结合我国草原的发展现状,提出社会主义新牧区建设的关键就是要充分利用草产业将生物链变为效益链和就业链。强调发展草产业是建设社会主义新牧区的重要途径。     

Design,synthesis and biological evaluation of novel 4,5-dihydro-[1,2,4]triazolo[4,3-f]pteridine derivatives as potential BRD4 inhibitors

Recently, diverse kinase inhibitors were reported having interaction with BRD4. It provided a strategy for developing a new structural framework for the next-generation BRD4-selective inhibitors. Starting from PLK1 kinase inhibitor BI-2536, we designed 18 compounds by modifying dihydropteridine core. Compound 23 showed potent BRD4 inhibitory activities with IC₅₀ of 79 nM and no inhibitory activities for PLK1. Cell antiproliferation assay was performed and potent inhibitory activity against MV4;11 with IC₅₀ of 1.53 μM. Cell apoptosis and western blotting indicated compound 23 induced apoptosis by down-regulating c-Myc. These novel selective BRD4 inhibitors provided new lead compounds for further drug development.     

Cryptogams on decaying wood in old-growth forests of southern coastal British Columbia

Abstract. We studied the floristic composition of lignicolous cryptogams (i.e. bryophytes and lichens inhabiting decaying wood) in the old-growth coniferous forests of southern coastal British Columbia. The composition of the cryptogams was related to forest communities (described by vegetation units using forest floor cryptogams and vascular plants) and regional climates (described by biogeoclimatic zones). The study is based on a total of 247 sample plots, each of 0.04 ha in size. The plots were located in three different biogeoclimatic zones and were classified into 12 alliances and four orders in a previous study. We used indicator species analysis to determine cryptogam indicator species for each vegetation unit and biogeoclimatic zone, and used similarity analysis and multi-variate analyses (discriminant analysis and detrended correspondence analysis) to detect differences in the floristic composition of the cryptogams among sample plots, vegetation units, and biogeoclimatic zones. Most of the cryptogams in this study had a narrow distribution, and only < 5% of the species were present across all the vegetation units and biogeoclimatic zones. The overall means of Jaccard coefficients between two sample plots from the same vegetation unit (alliance or order) or biogeoclimatic zone were significantly higher (P < 0.05) than those from different vegetation units or biogeoclimatic zones. The difference in the mean Jaccard coefficients within- and between-units was highest for zones. The results of detrended correspondence analysis and discriminant analysis suggest that the composition of lignicolous cryptogams changes with the change in the floristic composition of forest floor vegetation. When the first axes of detrended correspondence analysis were compared, the Pearson's correlation coefficients between the first axes of lignicolous cryptogams and forest floor vascular plants and between the first axes of lignicolous cryptogams and forest floor cryptogams were 0.78 and 0.87, respectively. The degree of correspondence in the composition of lignicolous cryptogams and forest floor vegetation increased from alliance to order to biogeoclimatic zone. This trend suggests that the floristic composition of lignicolous cryptogams is influenced at the community level mainly by edaphic conditions and at the regional level by climatic conditions.     

云南梅花草属一新种

多年生草本,高8-22cm,细弱。根状茎近圆柱形,径1.5-2.5mm,下部具多数纤维状根。     

辽宁千山植物区系与邻近几个区系的比较研究

用植物属、种的相似性系数以及属的分布区类型百分比进行聚类分析,对辽宁千山植物区系与邻近的长白山、五台山、小五台山、泰山、徂徕山、昆嵛山、庐山植物区系进行了比较研究。结果表明,千山植物区系与小五台山、五台山植物区系的关系比与昆嵛山、泰山、徂徕山植物区系的关系近,与长白山植物区系的关系较远,与庐山植物区系的关系最远。经分析认为将千山植物区系划入华北植物区系是合理的,但把辽东半岛和山东半岛划为同一植物亚地区是不合理的;支持鲁法军等人把辽东半岛植物小区划归华北山地植物亚地区的处理意见。     

中国苹果属(Malus Miller)植物两新变种

发现苹果属西蜀海棠的一个新变种-光果西蜀海棠,以全株尤其果实光滑无毛区别于原变种;及苹果属另一新变种-裸柱丽江山荆子,以花柱下部合生处光滑无毛区别于原变种。     

云南异颖草一新变种

本变种和原变种的区别在于:秆高30-50cm,具4-6节,叶舌长1-2mm,顶端齿裂,叶片长2-10cm,宽2-4mm,圆锥花序稍疏松,长8-15cm,宽1.5-3cm,分枝每节1-5枚簇生,小穗长2.5mm,绿紫色,第二颖长2.3mm,外稃长2.4-2.5mm,内稃长约为外稃的2/3。