CONJUGATION, DIVISION, AND ENCYSTMENT IN PLEUROTRICHA LANCEOLATA

Relationship of encapsulation and encystment in Azotobacter.

0. Wyss, M. Neumann, and M. Socolofsky (J. Biophys. Biochem. Cytol. 10:555, 1961) have shown by electron micrographs of ultrathin sections that the mature cyst of Azotobacter vinelandii strain 12837 can be divided into three main structural entities: the exine or cyst coat, the outermost laminated structure; the intine, a rather homogeneous layer, which, upon artificial rupture, appears to have...

Role in Alcohol Catabolism and Encystment

388 Encystment of Dysentery Ameb

I t has been stated in the literature that the vegetative form of the dysentery ameba dies within a few hours outside of its host and forms no cyst. In a study made in 1917, the author has observed, however, that the large vegetative ameba of dysentery is transformed into a smaller vegetative form, and that occasionally it develops in vitro a tetranuclear cyst. Proliferation takes place in feca...

Acanthamoeba polyphaga mimivirus prevents amoebal encystment-mediating serine proteinase expression and circumvents cell encystment.

Acanthamoeba is a genus of free-living amoebas distributed worldwide. Few studies have explored the interactions between these protozoa and their infecting giant virus, Acanthamoeba polyphaga mimivirus (APMV). Here we show that, once the amoebal encystment is triggered, trophozoites become significantly resistant to APMV. Otherwise, upon infection, APMV is able to interfere with the expression ...

GENES CONTROLLING CONJUGATION AND MITOTIC CELL DIVISION IN YEAST SACCHAROMYCES CEREVISIAE by

New mutations were isolated that affect nuclear fusion during conjugation in the yeast Saccharomyces cerevisiae. These mutations, called kem (Kar enhancing Mutation), enhance the nuclear fusion defect of the karl-l mutation. In crosses of karl-l strains, 10 15% of zygotes undergo nuclear fusion forming stable diploids whereas 85 90% of zygotes fail to have nuclei fused. The nuclear fusion defec...