沼泽绿牛蛙的核型研究

本对沼泽绿牛蛙的染色体核型进行了研究。结果证明了沼泽绿牛蛙的核以式为Ｋ（２ｎ）＝２６＝１６ｍ＋１０ｓｍ有５对大型不染色体和８对小型染色体,可以分成Ａ、Ｂ、Ｃ组,雌雄性个体间没有性染色体的分化。在第７号染色体短臂上出现次缢痕。     

黄斑星天牛产卵刻槽的空间分布格局及抽样技术

黄斑星天牛是新疆伊犁部分地区杨树、柳树、榆树等树种的主要蛀干性害虫.通过判断空间分布型聚集度的5项指标,并利用Iwao M*-m回归分析法、Taylor幂法则对黄斑星天牛产卵刻槽的空间分布型和抽样技术进行了研究,研究结果表明黄斑星天牛的产卵刻槽在柳树上呈聚集分布,Iwao M*-m回归方程M*=5.24+1.03m(r=0.998 2),利用回归方程中的两个参数值α、β,计算在不同允许误差下(0.1,0.2,0.3)的抽样数公式N0.1=239 7.16/m+11.52,N0.2=599.29/m+2.88,N0.3=266.35/m+1.28,计算了黄斑星天牛产卵刻槽在不同密度下的最适抽样数,并制作了序贯抽样分析表,对在生产实践中根据人力、物力确定调查样本数、制定防治指标都有一定的借鉴意义.     

Arteriovenous anastomoses in the juxtamedullary cortex of human kidney

Summary In the juxtamedullary cortex of normal human kidney the existence of arteriovenous anastomotic channels is demonstrated by means of microscopic observation. A clear arteriovenous anastomosis occurring at the level of an afferent arteriole is also presented.     

Condensation reactions of formyl- and acetyl-ferrocene

Riassunto Si riferisce sulla applicazione delle reazioni di Reformatskii e di Wittig al formil- e all'acetil-ferrocene per preparare i corrispondenti acidi ferrocenilacrilici. Viene anche descritta la condensazione del formilferrocene col nitrometano.     

Mutations in TTC19 cause mitochondrial complex III deficiency and neurological impairment in humans and flies

Although mutations in CYTB (cytochrome b) or BCS1L have been reported in isolated defects of mitochondrial respiratory chain complex III (cIII), most cIII-defective individuals remain genetically undefined. We identified a homozygous nonsense mutation in the gene encoding tetratricopeptide 19 (TTC19) in individuals from two families affected by progressive encephalopathy associated with profound cIII deficiency and accumulation of cIII-specific assembly intermediates. We later found a second homozygous nonsense mutation in a fourth affected individual. We demonstrated that TTC19 is embedded in the inner mitochondrial membrane as part of two high-molecular-weight complexes, one of which coincides with cIII. We then showed a physical interaction between TTC19 and cIII by coimmunoprecipitation. We also investigated a Drosophila melanogaster knockout model for TTC19 that showed low fertility, adult-onset locomotor impairment and bang sensitivity, associated with cIII deficiency. TTC19 is a putative cIII assembly factor whose disruption is associated with severe neurological abnormalities in humans and flies.     

水柏枝属植物的化学成分及生物活性研究进展

水柏枝属(Myricaria)植物全世界有13种,是重要的生态保护、药用和饲用植物.本文对该属植物的化学成分及药理进行综述,并对该属植物的研究提出展望.     

超声波有机溶剂法提取樱桃李籽油的工艺研究

采用超声波辅助法提取樱桃李籽油.通过单因素试验和正交试验考察了提取温度、提取时间、料液比、提取液配比对樱桃李籽油得率的影响.结果表明,各因素对樱桃李籽油得率的影响大小依次为：液料比＞提取时间＞提取温度＞提取液配比;樱桃李籽油的较佳提取工艺条件为提取液配比60%、料液比12mL·g-1、提取时间15min、提取温度50℃,在该条件下樱桃李籽油得率45.52%,所得油脂澄清、透明,呈黄色.     

Al对HP40合金高温力学性能的影响

通过中频感应炉熔炼制备出铝质量分数分别为5%、7.5%、10%的HP40合金,在900℃下测试各合金的高温拉伸性能,并在扫描电镜下观察各合金的断口形貌.结果表明:随着Al质量分数的增加,合金的高温屈服强度、抗拉强度均先升高后降低,合金的延伸率先降低后增加.铝质量分数为5%的HP40合金具有最佳的高温力学性能,其900℃下的屈服强度为125MPa,抗拉强度为132MPa,延伸率为12%.     

Al对HP40合金室温力学性能的影响

采用中频感应炉熔炼的方法制取样件.用光学显微镜分析在HP40合金中加入质量分数为5%～10%的Al元素时,各质量分数所对应的相组成和显微组织,研究在HP40合金中加入不同质量分数的Al对合金室温力学性能的影响以及合金力学性能与显微组织的关系.结果发现,加Al元素的HP40合金抗拉强度和屈服强度均随Al质量分数的增加而先升高后降低;合金的硬度随Al质量分数的增加而显著提高;合金的延伸率在Al质量分数为5%时,与未加Al的HP40合金一样未降低,而后随着Al质量分数的增加而降低.随着Al质量分数的增加,由于金属间化合物(Ni,Fe)Al的析出,合金的组织也发生了明显的变化,组织由网状结构变为枝状结构和羽毛状结构.