浮动弯角藻有性生殖和生殖生态

在浮动弯角藻卵配生殖中发现两种特殊的形态发生;糖原孢囊里形成一个长椭圆形薄膜和原初细胞由复大孢子变形产生。在有性细胞大小范内常发生分段生殖和由此产生两次细胞复大现象。在低温(12℃)低光(1000 1x)和22.5‰盐度条件下,该藻呈最适的性化效应。     

UV和HPLC测定草问荆总黄酮及山柰素含量

UV测定草问荆中总黄酮的含量,检测波长508 nm.HPLC测定草问荆中山柰素的含量,色谱柱为Hyper-sil C18柱(4.6 mm×250 mm,5μm);流动相为甲醇-0.4%磷酸溶液(56∶44);检测波长365 nm;流速1.0 mL.min-1;柱温为室温.结果显示,芦丁在0.01~0.06 mg/mL范围内线性关系良好,线性方程A=11.475C+0.009 6(r=0.998 9),平均回收率为101.87%,RSD为1.57%;山柰素的进样量在0.057~1.140μg范围内呈良好的线性关系,回归方程为Y=4 636.2X-47 562(r=0.999 9),平均回收率为99.03%,RSD=1.60%.本方法简单灵敏,准确可靠,重复性好,适用于草问荆中总黄酮及山柰素的含量测定.     

Life History of Western Ghats endemic and threatened Anuran – Matheran leaping frog, (Indirana leithii) with notes on its feeding preferences

The species Indirana leithii (Anura: Ranixalidae) is endemic to the northern Western Ghats of India and is distributed between latitudes 16°N and 21°N in this region. The tadpoles of this species have been previously studied for their morphology and feeding behaviour; however, their natural history is still not completely understood. In the current study, we provide information about the mating behaviour, egg laying and metamorphosis of the species. We observed that the species possesses reproductive mode number 19 as these frogs lay eggs inside the natural cavities of vertical rock surfaces near streams and waterfalls and their tadpoles are adapted for adhering to the wet rock surface, where they feed on algae (including diatoms) growing in seepage on the rocks. Interestingly, there is no audible calling or territory guarding involved during the courtship behaviour. This has been observed for the first time in any Indian anuran. We also provide data on food preferences of adults and tadpoles.     

硅藻短缝藻属（EunotiaHer．）的若干波缘变种的研究

报导了近年来对硅藻短缝藻属（ＥｕｎｏｔｉａＥｈｒ．）若干波缘变种的研究成果，对容易混淆的４个波缘变种：篦形短缝藻波缘变种、单峰短缝藻热带变种、巨大短缝藻波练变种及月齿短缝藻伸长变种进行形态学及分类学的比较研究，并就短缝藻属（ＥｕｎｏｔｉａＥｈｒ．）的一些问题提出讨论意见。     

南海珠江口伶仃洋浅层沉积硅藻的研究

在珠江口和南中国海伶仃洋的六个岩芯中,发现线纹小环藻组群(CyclotelIa striata complex)在各地层中均有分布,其数量由下层到上层呈递减的趋势。对各采集点样品进行多样性指数分析和聚类分析的结果表明,埋深为316—326cm处沉积硅藻的多样性指数最大,为2.09,111—125cm处最小,为0.36;在所有采样点中,有四对采样点相近程度大,环境条件应较为相近。