PROTEINS FROM Spirulina platensis BIOMASS

The accumulation dynamics of total protein, its fractional composition, and the molecular forms of key oxidoreductases were studied during cultivation ofSpirulina platensisbiomass.     

几种水体污染因子对钝顶螺旋藻生长的影响

为确定不同污染因子对钝顶螺旋藻（Spirulina platensis）生长的影响,对五种主要水体污染因子Hg^2 、Cr^6 、Pb^2 、酸雨、苯酚各取5个质量浓度梯度处理钝顶螺旋藻,使其在人工控制的环境下生长,每天测定培养液的光密度OD560,溶氧量DO和pH值以分析其生长情况,结果表明：钝顶螺旋藻对Hg^2 最敏感,对Cr^6 ,Pb^2 和苯酚的敏感性稍低,对酸性环境有较强的抵抗力。     

培养方法对钝顶螺旋藻生长的影响

比较两种培养方法：静置培养（每天定时摇动4次）和摇瓶培养（往复式摇床）对钝顶螺旋藻生长的影响。实验结果表明：遥瓶培养能加速藻的生长,生长周期缩短,生长速度、生物量、叶绿素a含量均高于静置培养,摇瓶培养能维持合适的溶解氧。摇瓶培养装置易于构建,混合效果良好,不易使螺旋藻丝断裂,还可使生物量提高约22．0％。     

Chemical composition and selenium distribution in selenium enriched Spirulina platensis biomass

Conditions for cultivating selenium enriched Spirulina platensis were developed. The protein, carbohydrate, lipids, and pigments were determined. The organic selenium and its distribution were analyzed. Published in Khimiya Prirodnykh Soedinenii, No. 6, pp. 519–522, November–December, 2006.     

原子吸收光谱法测定螺旋藻中铅和镉

采用干法灰化硝酸浸出盐分，火焰原子吸收法测定螺旋藻中Pb和Cd，试验了样品前处理方法和背景干扰消除方法。方法的相对标准偏差Pb为10．7％；Cd为9．9％。回收率在92％-ll0％之间。     

铋膜电极微分电位溶出法测定螺旋藻中铅的研究

建立了镀铋膜电极替代镀汞膜电极微分电位溶出分析(DPSA)测定铅的方法,考查了同位镀铋膜测定铅的条件.结果表明,铅可在镀铋膜电极上产生灵敏的微分电位溶出峰,并据此建立了螺旋藻中铅的同位镀铋微分电位溶出法.     

Cloning,Sequencing and Phylogenetic Study of rbcL Gene from Cyanobacteria Arthrospira and Spirulina

Large subunit gene of rubisco (rbcL) of cyanobacteria Arthrospiraplatensis FACHB341, A. platensis FACHB439, A. maxima OUQDSM and Spirulina sp. FACHB440 is cloned, sequenced and characterized. Results show that GC content of the gene in strain Spirulina sp. FACHB440 is higher than that in the others. The alignments based on deduced amino acid sequences indicate that Spirulina sp. FACHB440 is different from that in other three samples of Arthrospira, though they have the same conserved functional sites (95, 98, 121, 124, 221, 257). The nucleotide sequence similarity among the three strains of the genus of Arthrospira (96.5 - 99.6% ) is higher than that between Arthrospira and Spindina (78.1 - 78.5 % ). By comparison of the corresponding sequence of other cyanobacteria, a phylogenetic tree with two clusters is constructed. A. platensis FACHB341, A. maxima OUQDSM and A.platensis FACHB439 form the monophyletic linage, which is fully supported by bootstrap values (1000), while Spirulina sp. FACHB440 and Anabaena sp. PCC7120 cluster in another linage with the bootstrapvalue of 909.     

氢化物发生原子荧光光谱法测定螺旋藻中无机硒和有机硒

螺旋藻试样经硝酸、高氯酸消解,原子荧光光谱法测定总硒含量;用水浸提螺旋藻试样,经环己烷萃取后,水相采用硝酸、高氯酸消解后,原子荧光光谱法测定无机硒含量,间接测定螺旋藻中有机硒含量。总硒测定精密度在1.05%—2.10%之间,加标回收率在96.6%—102.3%之间;无机硒的浸提率在95.1%—100.7%之间,测定精密度在2.37%—3.70%之间,加标回收率在93.6%—98.4%之间,检出限为0.47mg/kg,满足螺旋藻中有机硒含量的测定。     

钝顶螺旋藻DNA中G,C的质量分数的测定

用Zarrouk培养基培养钝顶螺旋藻NS－90020，从中提取DNA，然后在加热条件下，使其DNA变性，跟踪DNA的变性过程中的增色效应，得到螺旋的熔解温度（Tm)，根据经验公式（C＋C）％＝2．44*（Tm-69.3)可以算出螺旋藻体内G，C百分质量分数，作为进一步研究螺旋藻的遗传特性及育种的基础。     

螺旋藻培养条件响应面法优化的研究

设计了用于螺旋藻培养的新型气升式光生物反应器，并用响应曲面法对其培养条件进行优化。实验选取影响螺旋藻生长的4个关键因子即光照强度、通气量、培养时间和接种量，并对其最佳水平范围进行研究，建立了以藻体干重为响应值的二次多项式方程。实验结果表明，4个因子对藻体生长的影响大小依次为光照强度、培养时间、装液量、通气量；对方程解逆矩阵可知，当光照强度、通气量、培养时闻和接种量分别达最佳水平44001x、212．2L／h、8．8d和7．2L时，DW最大值为1．277g／L。