Physiological Characteristics of Nitzschia hantzschia in Response to Nitrobenzene Stress

This study was conducted to investigate the effects of different mass concentrations of nitrobeneze on the growth, soluble sugar content, soluble protein content, chlorophyll a content and algal cell conductivity of Nitzschia hantzschia. The results showed that as the concentration of nitrobenzene increased, the growth of N. hantzschia was inhibited, and the algal culture liquids gradually changed from dark yellow to light yellow after 5 d of treatment;the soluble sugar content increased after 2 d;and the soluble protein content of the 100 mg/L nitrobenzene treatment group was 89.1% of the control group on day 1, which was the lowest value, and then showed a gradual upward trend. The low-mass concentration of nitrobenzene promoted the chlorophyll a content of algal cells, the medium and high mass concentrations had an inhibitory effect, and the chlorophyll a content of the 50 mg/L treatment gradually recovered after 3 d. The electrical conductivity of algal cells gradually increased with the increase of the mass concentration of nitrobenzene. The electrical conductivity gradually recovered after 3 d of the low mass concentration treatment, while the high mass concentration harmed the algae cells, causing N. hantzschia to gradually die.

菱板藻属(硅藻门)中国新纪录种

报道采自新疆及内蒙古地区的菱板藻属(硅藻门)中国新纪录植物7种,分别为丰富菱板藻(Hantzschia abundans Lange-Bertalot)、喜碱菱板藻(H.alkaliphilaLange-Bertalot)、巴克豪森菱板藻(H.barckhausenii Lange-Bertalot&Metzeltin)、较长菱板藻(H.longa Lange-Bertalot)、仿密集菱板藻(H.paracompacta Lange-Bertalot)、美丽菱板藻(H.spectabilis(Ehrenberg)Hustedt)和近活跃菱板藻(H.subvivacior Lange-Bertalot)。对其分类学特征进行了详细的描述,并给出了光镜或扫描电镜照片以及生境特征等,为该属种类的世界地理分布提供新资料。

水中典型致臭藻类培养浓度与吸光度、浊度关系探讨

颤藻（Oscillatoria Vauch.）和硅藻（Hantzschia amphioxys）是常见的导致地表水体臭味的藻类,本文分别对颤藻和硅藻培养液的吸光特性等进行了研究。经过光谱扫描发现,颤藻和硅藻在紫外区均无明显吸收峰;颤藻液在可见光区波长为420、440、625和675nm处有吸收峰,硅藻液在420和675nm处有吸收峰,颤藻液的吸光特性优于硅藻。研究发现,在一定浓度范围内,培养液中藻浓度与吸光度均成正比;本文同时探讨了培养液中藻浓度与浊度的关系,两者为线性关系;研究结果表明吸光度或浊度可准确反映培养过程中的藻浓度。