小型富氧器的研制

用改性甲基硅橡胶膜制成了富氧组件。当膜两侧的压力比为0.26或集气管的绝对压力为20cmHg时,其富氧性能:流量0.80—1.40升/分,富氧空气的氧气含量27.7—33.5%。由组件制成了7组件富氧器,这个富氧器在实验室进行了操作,其操作条件,膜两侧压力比(P_L/P_H)对富氧空气流量及富氧空气中氧含量或分离系数有巨大的影响。

固态高聚物状态方程的研究

本文从理论上导出了一个新的三参数固态高聚物的状态方程p=(B_o/4.98)[(V_o/V)~(7.14)-(V_o/V)~(2.16)+(T/T_o)] 在不发生转变的温度区域内,它适用于描述固态高聚物的压强-体积-温度关系.方程形式简单,物理参数的意义较明确.

Cytoglobosins A-G, Cytochalasans from a Marine-Derived Endophytic Fungus, Chaetomium globosum QEN-14

Financial support from the Ministry of Science and Technology of China (2010CB833802 and 2007AA09Z446) and from the National Science Foundation of China (30910103914) is gratefully acknowledged.

AiC1qDC-1, a novel gC1q-domain-containing protein from bay scallop Argopecten irradians with fungi agglutinating activity

The globular C1q-domain-containing (C1qDC) proteins are a family of versatile pattern recognition receptors via their globular C1q (gC1q) domain to bind various ligands including several PAMPs on pathogens. In this study, a new gC1q-domain-containing protein (AiC1qDC-1) gene was cloned from Argopecten irradians by rapid amplification of cDNA ends (RACE) approaches and expressed sequence tag (EST) analysis. The full-length cDNA of AiC1qDC-1 was composed of 733 bp, encoding a signal peptide of 19 residues and a typical gC1q domain of 137 residues containing all eight invariant amino acids in human C1qDC proteins and seven aromatic residues essential for effective packing of the hydrophobic core of AiC1qDC-1. The gC1q domain of AiC1qDC-1, which possessed the typical 10-stranded beta-sandwich fold with a jelly-roll topology common to all C1q family members, showed high homology not only to those of Cl qDC proteins in mollusk but also to those of C1qDC proteins in human. The AiC1qDC-1 transcripts were mainly detected in the tissue of hepatopancreas and also marginally detectable in adductor, heart, mantle, gill and hemocytes by fluorescent quantitative real-time PCR. In the microbial challenge experiment, there was a significant up-regulation in the relative expression level of AiC1qDC-1 in hepatopancreas and hemocytes of the scallops challenged by fungi Pichia pastoris GS115, Gram-positive bacteria Micrococcus luteus and Gram-negative bacteria Listonella anguillarum. The recombinant AiC1qDC-1 (rAiC1qDC-1) protein displayed no obvious agglutination against M. luteus and L. anguillarum, but it aggregated P. pastoris remarkably. This agglutination could be inhibited by D-mannose and PGN but not by LPS, glucan or D-galactose. These results indicated that AiC1qDC-1 functioned as a pattern recognition receptor in the immune defense of scallops against pathogens and provided clues for illuminating the evolution of the complement classical pathway. (C) 2010 Elsevier Ltd. All rights reserved.

Dissolved oxygen and O-2 flux across the water-air interface of the Changjiang Estuary in May 2003

The field observation of this study was carried out in the Changjiang Estuary from May 19 to 26,2003, just a few days before the Three Gorges Dam began to store water. A total of 29 stations, including 2 anchor stations, were distributed through almost the whole salinity gradient Based on the data gained from these stations, the biogeochemical characteristics of dissolved oxygen (DO) were examined. Spatial distribution of DO concentrations showed the pattern that it increased in a downriver direction. DO concentration generally varied within a narrow range of 733-8.10 mg l(-1) in the freshwater region and the west part of the mixed water region, and after that it increased rapidly. In vertical direction, the differences in DO concentrations between surface and 2 m above the bottom were big at the stations with water depths exceeding 20 m; DO concentration up to 14.88 mg l(-1) was recorded at the sea surface, while at 2 m above the bottom its concentration was only about 4 mg l(-1). The fluctuation in DO concentrations was small during a period of 48 h in the mixed water region and 2 m above the bottom of the seawater region; while it was large during the same period in the seawater region for surface and 5 m below the surface layer, and a maximum variation from 8.77 to 12.66 mg l(-1) in 4 h was recorded. Oxygen fluxes also showed a marked spatio-temporal variation. As a whole, the freshwater region and mixed water region were an oxygen sink while the seawater region was a source. Relationships between dissolved oxygen and some biogeochemical parameters which could markedly influence its spatio-temporal distribution were discussed in this paper. (C) 2008 Elsevier B.V. All rights reserved.

青海高寒草甸土壤放线菌区系研究

2001～2002年从海北高寒草甸生态系统采集土样,用不同方法从中分离放线菌300余株,根据其形态和分类特征,分别归入小单孢菌属(Micromonospora)、诺卡氏菌属(Nocardia)、糖多孢菌属(Saccharopolyspora)、原小单孢菌属(Promicromonospora)和链霉菌属(Streptomyces),并将链霉菌归入7个类群.同时对230株中温菌和110株低温菌的部分酶活性及其对真菌和细菌的拮抗性进行了测定,发现链霉菌不仅具有许多酶活性,而且对真菌和细菌有拮抗性.

青藏高原不同海拔矮蒿草抗氧化系统的比较

对生长在青藏高原不同海拔自然生境下的多年生典型抗寒植物－矮蒿草（Kobresia humilis）的抗氧化系统进行了比较研究。结果表明，矮蒿草的叶组织中，非酶抗氧化系统物质脯氨酸（Pro）和抗坏血酸（AsA），随着海拔升高具有明显的增加趋势。在抗氧化酶系统中，过氧化物酶（POD）和过氧化氢酶（CAT）活性均随海拔的升高，而明显增强。但叶中的超氧化物歧化酶（SOD），随着海拔的升高，其活性有下降趋势，三者变化趋势并不一致。高海拔矮蒿草的植株与低海拔的植株相比，叶细胞内的膜脂过氧化加剧，丙二醛（MDA）含量明显增。细胞可溶性蛋白也随海拔升高显著增加。根中的抗氧化系统变化与叶中的有所不同。根中AsA含量随海拔而显著升高，且较叶中的增加明显，但Pro含量则有所减少。根中的CAT和POD活性变化与叶中的变化趋势基本一致，且随海拔高度的增加，根中的CAT活性较叶中的变化更为明显。而根中的SOD活性变化不如叶中明显，MDA含量随海拔增高，其变化趋势比叶中的小。可见，青藏高原典型抗寒植物矮蒿草体内的两类抗氧化系统，在不同海拔条件下可能存在互补协同的调节作用，这可能是矮蒿草适应或抵抗高原极端高寒低温和强UV－B辐射等环境胁迫的重要生理机制之一。

滇西上芒岗红色粘土型金矿常量元素地球化学

西上芒岗红色粘土剖面中常量元素的垂向分布研究表明，K20、 03、Al203在剖面中的变化一致，呈双 峰曲线变化，即在坡积带稍有富集、在残积带明显富集；而SiOz与铁、铝等在剖面中的变化相反。红色粘土与 矿区地层和矿化蚀变岩的常量元素对比分析表明了红色粘土可能来源于地层和矿化蚀变岩。常量元素之间 的相关性以及常量元素与金的相关性分析表明K20、F 03、Al203在红色粘土中为共生元素；金的富集主要受红 色粘土中褐铁矿和伊利石的吸附影响。红土化参数分析说明了红色粘土剖面经历两次红土化作用，残积带相 对于其它带经受过较强的红土化作用，但整个红色粘土剖面遭受的红土化作用不强，红土化程度低。仅处于粘 土化阶段。