Effects of chlorine gas exposure on lung haemodynamic and respiratory function in intact and isolated perfused rabbit lungs

AIM:To investigate the effect of high concentration of chlorine gas(Cl₂) exposure on lung haemodynamic and respiratory function in intact and isolated perfused rabbit lungs (IPLs). METHODS:8 intact and 10 IPLs were exposed to Cl₂ at high concentration(50×10^-4)for 20 min, as measured group, 8 additional intact and 9 IPLs, which were similarly treated but not exposed to Cl₂, served as controls. The changes of lung weigh of IPL(△W)、pressure of pulmonary artery(Pa)and venous pressure(Pv)、airway pressure and tidal volume(TV) were continuously measured and recorded simultaneously. RESULTS: In IPL group: While the perfusing blood flow was kept constant (133.3 mL/min), and Pv did not change, following the exposure, the Pa increased slightly, then the lung weight were increased significantly and the TV decreased . Hematocrit of perfusate of EIPL and parameters of lung water increased also. In intact group: Pa increased slightly, respiratory rate accelerated immediately, and TV decreased. CONCLUSION:Although mean Pa increased continuously and slightly in both intact and IPL group following the exposure to high concentration of Cl₂, the primary cause of edema was most likely to alter pulmonary capillary permeability. The respiratory rate accelerated and TV decreased due to exposure to Cl₂ enhanced hypoxia of intact rabbits.     

松节油工业现状与市场

概述了国内外松节油的生产和市场分布现状，并对松节油市场消耗走势进行了分析，提供了历史数据和预测情况。     

Detection of Allelic Variation in Chinese Wheat (Triticum aestivum L.) Germplasm with Drought Tolerance Using SSR Markers

Allelic variation in two domestic wheat landraces, Pingyaobaimai and Mazhamai, two cornerstone breeding materials and their derived cultivars with drought tolerance was detected by SSR (simple sequence repeat) markers. The clustering of 25 accessions showed that the similarity between Pingyaobaimai and Yanda1817, the latter was developed from the former, was 0.71, the highest one of all accessions, but the similarities were very low between these two accessions and other accessions including their derived cultivars. A similar situation was revealed between Mazhamai and its derived cultivars. Pingyaobaimai and its three derived cultivars shared three alleles at loci Xgwm526, Xgwm538 and Xgwm126 on chromosome arms 2BL, 4BL and 5AL, respectively. There were six shared alleles in Mazhamai and its derived cultivars, in order of Xgwm157,Xgwm126, Xgwm212, Xgwm626, Xgwm471 and Xgwm44 on chromosome arms 2DL, 5AL, 5DL, 6BL, 7AS and 7DC, respectively. Only one shared allele was detected between the pedigrees of Pingyaobaimai and Mazhamai. The difference of shared alleles in two cornerstone breeding materials and their derived cultivars revealed the diversity in Chinese wheat germplasm with drought tolerance and the complication in genetic basis of drought tolerance in wheat.     

阿拉善查汗套海滩生态建设区最佳水文地质环境评价研究

干旱沙漠区环境治理，水文地质环境是制约其它因素的关键。地下水位过高引起土壤盐渍化，地下水位过低则引起沙漠化。而正确确定地下水临界深度将成为查汗套海滩生态环境建设的瓶颈。本文提出地下水资源的允许开采量作为解决生态环境建设的重要途径之一，具有很好的资源效益和环境效益。     

玉米优良自交系D黄212的选育研究

以11个国外亲缘白粒玉米中晚熟地方品种或品系为基础群体,人工合成D团综合种选系集团,利用集团选系自D114与黄早4杂交,经10a分离选择,育成D黄212自交系.D黄212唐山夏播生育期88～90 d,一般产量4 500～5 250 kg/hm2,接种鉴定大、小斑病0.5-1级,青枯病株率0～16.5%,矮花叶病株率0,粗缩病0级.用该系选配杂交种15个,表现早熟、高产、抗病,其中已通过审定的品种4个,主要分布于冀、京、津、豫、鲁、辽、吉、蒙、黑、新等省市自治区,累计推广面积100万hm²。     

院校合并后高校图书馆的特点及面临的问题

本文阐述了院校合并后，高校图书馆在馆藏资源、馆藏特色、馆藏文献的范围、信息化程度以及人力资源．流通工作等方面的特点。提出了院校合并后图书馆亟待解决的几个重要问题。     

小美旱杨防护林对林带下土壤盐分均衡的影响

通过测定小美旱杨Populus simonii×(Populus pyramidalis Salix matsudana)‘Poparis’标准木耗水量、树体不同部位储盐质量浓度和标准木生物量,推算12年生小美旱杨全生长期耗水量中总盐分质量浓度以及小美旱杨采伐时可带离的盐分,分析小美旱杨水分代谢过程对林下土壤-潜水系统盐分均衡的影响。结果表明,小美旱杨耗水中所含盐分离子的92%左右进入林下土壤-潜水系统中,其余随采伐被带离,但小美旱杨农田防护林带蒸腾造成的林下积盐在灌区积盐中仅占很小的比例。小美旱杨对营养元素的选择性吸收和对有害离子的拒吸作用,对林下土壤的可溶盐离子组分比例有一定的影响,主要表现是使进入土壤-潜水系统的Ca2 组分比例减小。表9参15     

NE苗木助长剂在苗木培育和杨树造林中的应用

NE苗木助长剂是中国农业大学、吉林大学化学系与佳木斯大学联合研制的可溶性苗木助长剂。经北华大学林学院和红石林业局在东兴苗圃、板庙子林场的苗木培育和造林中应用，取得了良好的结果。     

Genetic Diversity Analysis of Three Newly Discovered Native Chicken Breeds in Yunnan Using mtDNA D-loop Region Sequences

This study was aimed to evaluate the information of their genetic background of Frizzle chicken (FM),Naked-neck chicken (CB) and YN chicken (YN) that were three newly discovered native chicken genetic resources with excellent characteristics,which had been found in Nujiang prefecture and mountainous area of Yunnan province.The variation in a total of 168 individuals sampled from the three chicken populations was assessed using the mitochondrial DNA (mtDNA) D-loop region sequences as genetic marker.The results showed that there were a total of 27 haplotypes were defined in the three native chicken as well as the haplotype diversity of these three chicken were 0.947,0.938 and 0.596,respectively.The nucleotide diversity of these three chicken were 0.01268,0.01434 and 0.00239,respectively.Phylogenetic tree displayed that all 168 individuals distributed in maternal lineage A,B,C,E,F and G.Frizzle chicken contained lineages E,F and G,and Naked-neck chicken contained all 6 lineages,of which the main lineages were E,F and G.YN chicken included lineages E,F and G,and lineage E was the highest percentage in this population.Also,it found that YN chicken was closely related to Gallus gallus murghi,White Plymouth Rock chicken,White Leghorn chicken and New Hampshires chicken,while Naked-neck chicken was closely related to Gallus gallus spadiceus,Gallus gallus jabouillei,Gallus gallus gallus Linnaeus,Indonesian cockfight and Laos chicken.The Frizzle chickens shared more haplotypes with Naked-neck chicken,and the evolutionary relationship between the two species was closer.This study provided a basis for the origin and genetic assessment of three newly discovered Yunnan local chicken breeds.     

Bernstein-Kantorovich算子的迭代布尔和在L∞[0,1]中的逼近性质

利用光滑模讨论了Bernstein-Kantorovich算子的迭代布尔和(×)rKn对L∞[0,1]中函数逼近的等价定理.

Abstract：

Using moduli of smoothness, the equivalent theorems on approximation by the iterated Boolean sums(×)rKn of Bernstein-Kantorovich operators Kn for functions which are defined in the space L∞ [0, 1] are studied.