Showing papers on "Flagellate published in 1975"

Studies on the rumen flagellate Neocallimastix frontalis.

Abstract: The vast increase in the population density of the rumen flagellate Neocallimastix frontalis shortly after the host animal has commenced eating is caused by stimulation of a reproductive body on a vegetative phase of the organism to differentiate and liberate the flagellates. The stimulant is a component of the host's diet. The vegetative stage of N. frontalis bears a strong morphological resemblance to that of certain species of aquatic phycomycete fungi, and consists of a reproductive body borne on a single, much branched rhizoid. The flagellates liberated in vivo within 15 to 45 min of feeding lose their motility within 1 h and develop into the vegetative phase, thus producing a rapid decrease in population density of the flagellates. Conditions for maximum flagellate production are similar to those ocfnring in the rumen: pH 6.5, 39 °C, absence of O2, presence of CO2. Differentiation of the reproductive body is inhibited by compounds affecting membrane structure and function, but not by inhibitors of protein synthesis. The organism was cultured in vitro in an undefined medium in the absence of bacteria or other flagellates.

The winter dark survival of an algal flagellate — Cryptomonas erosa (Skuja): With 5 figures and 1 table in the text

Abstract: The physiological ecology of a freshwater nannoplankter Cryptomonas erosa (Skuja) was investigated in the light and dark in batch culture. Low temperatures significantly reduced cell division rates...

Observations on a trypanosomatid flagellate in a flea, Peromyscopsylla silvatica spectabilis.

Abstract: The method of attachment of a trypanosomatid parasite to the cuticular epithelium of the hindgut of a flea Peromyscopsylla silvatica spectabilis by a desmosome-like structure is described ; the flagella are modified and have enlarged intraflagellar areas which occupy the whole surface area of the gut, including clefts and folds of the epithelium. Unusual features of the parasite itself include a very much reduced flagellar pocket and pellicular microtubules which are made up of doublets and triplets. The problems of differentiation and characterisation of monogenetic insect flagellates are discussed in the light of these findings.

Some aspects of the initiation of protein synthesis in Crithidia fasciculata and Tetrahymena pyriformis

Abstract: 1. 1. The growth of the ciliate, Tetrahymena pyriformis, is inhibited by a number of dipeptides in the presence of suboptimal concentrations of folate. 2. 2. Its growth is also sensitive to chloramphenicol and does not occur in the absence of folate. The reverse is true of the kinetoplastid flagellate, Crithidia fasciculata. 3. 3. It is suggested that the initiation of protein synthesis in the kinetoplast-mitochondrion does not require a formylated species of aminoacyl-tRNA or that the proteins of the organelle may be cytoplasmic in origin.