一种灰树花菌丝体多糖GF4F1的结构特征及其抗肿瘤活性

以灰树花发酵菌丝体为原料,经过提取分离纯化得到1种水溶性多糖GF4F1,经高碘酸氧化、Smith降解、甲基化、红外光谱（IR）以及核磁共振波谱（NMR）等分析表明,该多糖是1种β-1, 3／1,6-葡聚糖,且小鼠体内实验结果表明其具有良好的抗肿瘤活性。在1mg／kg时,对小鼠抑制率为67.3％。     

Cloning and characterization of glyceraldehyde-3-phosphate dehydrogenase encoding gene inGracilaria/Gracilariopsis lemaneiformis

Glyceraldehyde-3-phosphate dehydrogenase （GAPDH） plays important roles in various cellular processes. A cytosolic GAPDH encoding gene （gpd） of Gracilaria/Gracilariopsis lemaneiformis was cloned and characterized. Deduced amino acid sequence of the enzyme of G. lemaneiformis had high homology with those of seven red algae. The 5＇-untranslated regions of the GAPDHs encoding genes of these red algae varied greatly. GAPDHs of these red algae shared the highly conserved glyceraldehyde 3-phosphate dehydrogenase active site ASCTTNCL. However, such active site of Cyanidium caldarium was different from those of the other six algae at the last two residues （CL to LF）, thus the spatial structure of its GAPDH active center may be different from those of the other six. Phylogenetic analysis indicated that GAPDH of G. lemaneiformis might have undergone an evolution similar to those of Porphyra yezoensis, Chondrus crispus, and Gracilaria verrucosa. C. caldarium had a closer evolutionary relationship with Cyanidioschyzon merolae than with Cyanidium sp. Virtual Northern blot analysis revealed that gpd of G. lemaneiformis expressed constitutively, which suggested that it might be house-keeping and could be adapted as an inner control in gene expression analysis of G. lemaneiformis.     

Evolution of a Long-lived Sunspot Group and Its Associated Solar-terrestrial Events

A long-lived sunspot group (AR 9604) on the south hemisphere that lasted five solar rotations and produced some strong bursts is analyzed. The focus is on its evolving features. Its whole life was successfully maintained by four Emerging Flux Regions (EFRs). Apart from the one that lasted only a short time and did not produce any bursts, the other three EFRs have the following common features: (1) A positive writhe of magnetic flux tubes and a twist of the field lines of the same sign, indicating kink instability. (2) A clockwise rotation and a high tilt because the writhe was right-handed. (3) A compact ““island δ““ structure of the sunspot group indicating concentrated kink instability. Since magnetic reconnection easily occurs at the kinked point of a very kink-unstable flux tube, these features should be the inducement of the strong bursts.     

Study on respiratory electron transport system （ETS） of phytoplankton in Taiwan Strait and Xiamen Harbour

Phytoplankton respiratory electron transport system (P-ETS) activities were studied in two cruises in Taiwan Strait (Aug. 1997 and Feb. -Mar.1998) and two cruises in Xiamen Harbour (Oct., 1997 and Apr.,1998). Results showed that P-ETS activity in the surface water of southern Yaiwan Strait in summer was homogeneous [mean value of 0.106 μ102/(L.h)], inhomogeneous in northern Yaiwan Strait in winter. Variation of P-ETS activity in middle part of the Strait was not obvious between summer and winter. Mean P-ETS activity of Xiamen Harbour in autumn was 0.255 μ102/(L.h) with a little higher value in Jiulong River estuary areas. In spring, P-ETS activity was more homogeneously distributed and the mean value was 1.076 μ102/(L.h). P-ETS activity in spring was obviously higher than in autumn in Xiamen Harbour. Vertical distribution of P-ETS in Taiwan Strait was homogeneous at some stations in winter and in summer. An obvious daily variation of P-ETS activity was recorded at Stn 9837, high at midnight and low in the early morning. Significant correlation between P-ETS activity and Chl-a was observed. Results also showed that the ratio of estimated respiratory rate to photosynthetic rate varied seasonally, high in winter (0.41) and low in summer (0.12).     

藻类聚磷的特殊作用

本文介绍实验室中进行的螺旋藻聚磷作用试验,用微机数据采集系统作精确记录.其结果表明藻类在对数生长期通过两种途径进行聚磷作用.其一是改变环境的pH值、离子平衡系统和氧化还原电位促进磷酸盐形成并沉淀;其二是藻细胞的吸附和吸收富集磷.这些为生物成矿学说提供了有价值的新证据.     

巨野矿区煤自燃特性及动力学研究

针对巨野矿区3号煤层自然发火严重的现状,选择巨野矿区3上和3下两煤层煤样,采用煤的物性参数测试、热重分析、傅里叶红外光谱测试等实验方法,进行巨野矿区3煤层的自燃特性及动力学参数实验研究。结果表明,巨野矿区煤属于Ⅱ类自燃煤,煤的孔隙主要以大孔和中孔为主;煤在失水失重与吸氧增重阶段的活化能分别为94.49~123.61 kJ/mol和231.50~241.08 kJ/mol;煤分子中含有大量的羟基、甲基、亚甲基等活性官能团,这些活性官能团是导致巨野矿区煤自燃的关键化学结构。      

存贮对海洋微藻活性和脂肪酸分布影响的综述

在饲养许多水生动物时，微藻常常用来作为幼虫饵料，因此培养鲜活做藻就显得十分重要。由于环境条件的不利或其它生物体的污染，而导致微藻培养的失败，常常引起培养的幼虫在发育到商品规格前就食物链中断。如能够提供给孵化场以优质的存贮微藻，对于水产养殖研究和商业孵化场都有十分重要的意义。目前X国学者都已将注意力集中到选择微藻及其存贮技术的研究中（其中保存方法如：冻干存贮、在液态氮中存贮和冷冻浓缩存贮等）。用于海洋动物幼虫和幼年期培养的微藻，其营养价值是和多种不饱和脂肪酸计UI；A）的含量有关的。因此存贮方法必须…