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法尔根氏核酸反应法(Feulgen reaction)是—种试验细胞核中含有胸腺核酸(Thymo-nucleic acid)的方法。这个方法现在已经广泛地应用到生物科学的领域里;不少种类动植物的细胞核,可以经过这个反应显出鲜艳的紫红色,在原生动物中,有人采用这个方法来研究草履虫和(?)体虫(Trypanosoma)的核分裂。原生动物在休眠状态的包壳时期和孢子时期,在细胞质的表面,形成了一层很坚固的包壳,有了这层包壳,在制作标本时,能阻挡染料的透入,所以一般的染色法,不能把包壳里面的结构染上颜色。如果应用法尔根氏核酸反应,就能透过包壳,把壳内的细胞核,照样起着反应,现出它的结构。像草履虫一类的包壳,疟原虫一类的胶孢子虫(寄生在鱼类肌肉内的原生动物,致鱼类在体外的患处形成肿瘤)的孢子,就能应用这种方法。但变形虫一类的原生动物,则不起反应,就不能显出核的结构了.
The Feargen reaction is a method of testing for the presence of Thymo-nucleic acid in the nucleus. This method is now widely used in the field of biological science; many species of animal and plant nuclei, through this reaction shows bright purple, in protozoa, some people use this method to study Paramecium and (?) Mitosis of Trypanosoma. Protozoa in the dormant period of the shell and spore period, in the cytoplasm surface, forming a very strong layer of cladding, with this layer of cladding, in the production of specimens, can block the penetration of dye, so the general Dyeing method, can not color the structure inside the cladding. If you use the Faergen nucleic acid reaction, it will be able to penetrate the envelope, the shell nucleus, still play a reaction, showing its structure. Such as paramecium shell, Plasmodium spp. (Protozoan parasites in fish muscle, causing fish in the affected area to form a tumor) spores, you can use this method. However, protozoa such as amoeba, can not react, it can not show the structure of the nuclear.