Cell ultrastructure

A method of assessing the toxicity of implants has been proposed based on the effects on cell ultrastructure in organ cultures, on cell surface characteristics, and cell population doubling times. The effects have been correlated with hemorrhage, fibrosis, and necrosis, respectively (103). Poly-e-caprolactone was stated to give minimal tissue reaction and could not be scored in these tests. 

Because disrupted tissue preparations were unsatisfactory, attempts were made to work either with more organized systems such as tissue slices (liver-Krebs) or to identify and isolate the intracellular organelles involved in the reactions. Cytochemical procedures were developed in the 1930s and 1940s to locate sites of reaction in situ in cells (Chapter 9). Examination of cell ultrastructure became possible when the electron microscope was introduced after 1945. Techniques for the isolation of cell organelles, notably mitochondria, were developed about this time (Chapter 9). 

Electron micrographs of cell ultrastructure become available. 

Quennedey A. (1998) Insect epidermal gland cells ultrastructure and morphogenesis. In Microscopic Anatomy of Invertebrates, Volume 11A Insecta, pp. 177-207. 

Staubli W, Hess R. 1975. Lipoprotein formation mthe liver cell. Ultrastructural and functional aspects relevant to hypolipidemic action. In Kritchersky D, ed. Handbook of experimental pathology, VoL 41. Hypolipidemic/agents. Berlin Springer-Verlag, 229-289. 

The dominant component of the aqueous compartments in a cell is water, a fraction of which exhibits properties that are known to differ rather markedly from those of pure water. However, the exact proportion of differently structured water is not yet clear. Although the implications of such differences for metabolism and cell ultrastructure remain to be determined, they are likely to be profound. Shown in Figure 1 is a cartoon of Clegg s (1984) proposed ordering of water in the immediate surroundings of the microtrabecular lattice (MTL) of a cell. 

Effect of Brassinosteroids on Protein Synthesis and Plant-Cell Ultrastructure under Stress... 

Brassinosteroids (BSs) represent a new group of plant hormones that possess a broad spectrum of physiological activities (1,2). A most Intriguing property of BSs Is their capacity to Increase stress resistance In plants, but the mechanism of such an antistress activity still remains unknown (1). As cell stress resistance Is usually associated with stress protein synthesis (3 4) our aim was to study the BS effect on protein synthesis and ultrastructure of wheat leaf cells at normal temperature and under heat shock conditions. We have also studied the Influence of BSs on mesophyll cell ultrastructure under saline stress. 

KULAEVA ET AL. Effect on Protein Synthesis and Cell Ultrastructure... 

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