含铍含氟硫化铋精矿氯化浸出液中铋、铍、铁物种研究

柿竹园含铍含氟铋精矿成分十分复杂，其氯化浸出液中铋、铍、铁等分别与配位体Ｃｌ－，Ｆ－，ＳＯ２－４形成配合物，物种多达４０余种．因此，弄清这些物种的分配和行为，对于该精矿的冶金过程机理及工艺研究都具有重要意义．本文根据同时平衡原理和电中性原理，建立铋、铍、铁及氯浓度平衡和电荷平衡方程，然后用电子计算机联解，求得了各物种分配，并从理论上分析了几种主要元素在干馏过程中的行为，用以指导干馏工艺研究，实验结果与分析结果彼此符合较好．从而使Ｂｉ－Ｂｅ，Ｂｉ－Ｆｅ分离工艺难题得以解决．     

云南瘤蚱属一新种(蚱科:刺翼蚱亚科)

在整理采自云南省蚱科的标本中,发现有瘤蚱属(Thoradonta Hancock)一新种,现报道如下。模式标本保存于陕西师范大学生物系蝗虫研究室。澜沧瘤蚱 Thoradonta lancangensis,新种雌性:体小型,体上密具颗粒和瘤突。头短,头顶的宽度大于一个复眼宽的1.6倍,中隆线在前缘处略突出,侧面观略微突出于复眼之前,颜面隆起侧观呈波状,在一对单眼之间     

Isoforms of soluble alpha-tubulin in oocytes and brain of the frog (genus Rana): changes during oocyte maturation

Rana oocytes have previously been shown to contain much more soluble tubulin than does the brain, suggesting different assembly and disassembly dynamics of frog oocyte tubulin compared to that in brain. By using centrifugation, SDS-PAGE, two-dimensional gel electrophoresis and Western blots, probed with anti-α-tubulin monoclonal antibodies, polymorphic α-tubulins (isoforms) were compared in brains and follicle-enclosed oocytes of northern (Rana pipiens) and southern (R. berlandieri) frogs. Oocyte tubulin in both species had isoforms with greater ranges of isoelectric point (pI) than those of brain tubulins; in particular, the oocyte tubulin pIs ranged further into the acidic region of the isoelectric-focusing gels than corresponding brain tubulin. This difference may, in part, be responsible for the previously reported assembly differences between oocyte tubulin (undetectable assembly) and brain tubulin (high assembly). Isoforms of α-tubulin with relat ively acidic pI were more abundant in northern frog brain and oocyte soluble extracts than in analogous extracts from southern frogs. Furthermore, additional acidic α-tubulin isoforms were found in progesterone-treated oocytes (i.e., eggs), indicating increased heterogeneity of acidic a-tubulin isoforms during oocyte meiotic maturation. Among northern frog oocyte soluble components fractionated on Superose-6b columns, tubulin complexes with apparent molecular mass of about 1800 kDa were found to contain acidic α-tubulin isoforms while the putative oligomeric tubulins with an apparent molecular mass of about 250 kDa contained an additional relatively basic α-tubulin isoform. The acidic α-tubulin isoforms, therefore, are proposed to be associated with cold-adaptable cells of brain and oocytes, and may also be involved in stabilization of large soluble tubulin complexes in oocytes of the northern frog. Received 1 October 2002; accepted 9 October 2002 RID="*" ID="*"Corresponding author.     

La_(1-x)Sr_xCo_(1-x)B_xO_3(B=Fe,Ni,Cr)催化CO氧化活性及其表面氧研究

研究了 L a1-x Srx Co1-x Bx O3 (B=Fe,Ni,Cr)复合氧化物催化剂催化 CO氧化活性 ,并通过氧的程序升温热脱附 (TPD)研究了该类催化剂的表面氧 ,结合活性与表面氧随 x的变化规律讨论了表面活性氧种     

污水灌溉对农田土壤动物群落结构的影响

通过对济南北郊污水灌溉土壤动物群落的调查发现,土壤动物群落的结构和种群分布形式受到土壤污染的影响：土壤动物的群落结构衰退,多样性和均匀度下降,垂直分布出现逆分布型。     

广西河池地区蝗虫调查

记录广西河池地区蝗虫类５１种,分属于３总科１１科,其中有１总科２科１６种为河池地区第１次记载,并有１新种,龙江柯蚱。新种的模式标本保存于陕西师范大学动物研究所。     

在线大气汞分析仪的开发及应用

作者基于金汞齐 冷原子荧光光谱法,自行开发用于分析环境空气中气态总汞（TGM）的在线监测仪器。该仪器操作时以净化后的环境空气作为载气,无需氩气或氮气。经测试：当采样流量为1L/min,采样时间为10min时,检测限能达到0.2ng/m³;0.1ng汞蒸气连续测定结果表明其相对标准偏差<1.4%;工作曲线线性良好,r=0.9995。运用该仪器,在北京大学对TGM进行了为期3周的连续观测,得到TGM平均浓度为7.8ng/m³。     

气相爆轰波与空气冲击波在斜劈上Mach反射的特征参数比较

以传统的烟迹技术记录胞格结构,证实了气相爆轰波 在管道中与斜劈要互作用发生Mach反射,得到了系统的实验结果,在此基础上详细地分析了爆轰波反射后流场的特征参数（三波咪这线与楔面的夹角X与斜劈楔角X与斜劈楔角及气体初压P0的关系等）,并与空气冲击波在斜劈上Mach反射后流场的特征参数进行了比较,初步探讨了参数偏差的原因,这一研究有助于比较深入,全面地了解爆轰波的前导冲击波和横波在Mach反射中所起的作用。     

小鲵科Hynobiidae同物异名及有效种问题的研究

对有属两栖小鲵科Hynobiidae山溪鲵属,巴鲵属,小鲵属分类研究中的同物异名,以及属称和种数订正中的一些分类学问题进行了探讨,无唇褶山溪鲵B. cochranae不是北方山溪鲵Batrachuperus tibetanus的同物异名,巴鲵属是一个有效属称,义乌小鲵Hynobirs yiwuensis应为中国小鲵H.chinensis的同物异名,黄斑拟小鲵Pseudohynobius flavomaculatus可以暂定为秦巴北鲵Ranadon tsinoaensis的同物异名,黑爪异鲵Xenobius melanonychus是滞有效种有待确定。     

甲腹茧蜂属二新种记述（膜翅目：茧蜂科：甲腹茧蜂亚科）

记述了采自陕西的甲腹茧蜂属（Chelonus Jurine1801)二新种：1．大齿甲腹茧蜂Chelonus majusdentatus sp.nov.,与Ch.Subannulatus Abd,相似,但通过以下特征可以区分：触角28节;颊短于复眼纵径这半;径脉第一段与第二段相等,小脉从第一盘室基部1／3外发出;后足股节长为宽的4倍;产卵器长,伸出腹腔外,2．巨斑甲腹茧蜂Chelonus grandipunctatus sp.nov.,与Ch,obscuratus H-Sch1838相似,但有以下不同;颜面具有中纵脊;颊短于复眼纵径之半,上颊窄于复眼横径;腹部黄斑大、矩形;足的基节、转节、股节基部、后胫节端部均为红黄色,模式标本保存在陕西师范大学生命科学学院。