Showing papers by "University of Siena published in 1971"
TL;DR: Electron microscopic studies on the body wall of Tardigrada show the presence of three layers from the outside, (1) a compact acellular cuticle, (2) a one cell-thick epidermis, and (3) an exceedingly thin collagen coat.
45 citations
TL;DR: It is observed that the limiting membrane of the insect spermatozoon is asymmetrical and is a glycoprotein coat occurring in three structural patterns exhibiting progressive structural complexity.
37 citations
TL;DR: The data suggest that the psychiatric population has some defect in the facilitatory mechanisms as the subjects became older and the recovery cycle of normal subjects showed a progressive increase in the facilitation period with the progress of age.
31 citations
01 Jan 1971
TL;DR: By means of scanning electron microscope “en face” examination of aortic intimal surface, two phases are recognizable in the development of experimental cholesterol atherosclerosis in the guinea-pig.
Abstract: By means of scanning electron microscope “en face” examination of aortic intimal surface, two phases are recognizable in the development of experimental cholesterol atherosclerosis in the guinea-pig. During the first phase, after about two months of hypercholesterolic diet, no intimal plaques are to be found, and an amorphous substance (fibrin? — lipoproteins?) is deposited as a diffuse covering of wide areas of the aortic intimal surface along with erythrocytes and platelets. During this first phase, localized “flattenings” of the intimal folds are also evident.
23 citations
TL;DR: The development of characteristic cytoplasmic inclusions from endoplasmic-reticulum (ER) cisternae in nucellar cells of some species of Euphorbia has been studied by electron microscopy.
Abstract: The development of characteristic cytoplasmic inclusions from endoplasmic-reticulum (ER) cisternae in nucellar cells of some species of Euphorbia has been studied by electron microscopy. The formation of these organelles is preceded by the appearance of rough ER cisternae filled with an electron-dense material and forming complicated networks. Vesicular structures are formed which grow rapidly to give electron-dense, spherical dilations. On the outer surface of their limiting membrane numerous ribosomes and often polysomes are present. This membrane can be seen to remain continuous with the membranes of one or more cisternae of the rough ER up to when the dilations have a maximum diameter of 2.5–3 μ. At this time, continuity between the ER cisternae and the spherical dilations ceases. After this the new cell organelles remain unchanged in size, shape, and electron-density until the cell is disintegrated by the growing embryo-sac. The fate of the contents of these organelles is discussed.
14 citations
TL;DR: Plasma levels of thyrotrophin (TSH) were studied by radio‐immunoassay using homologous human TSH in 142 normal pregnant women and in 19 women with pre‐eclampsia and in 11 newborn infants.
14 citations
TL;DR: A series of reagents of aminoacid residues inhibit the activities of tyramine oxidase (MAO) and acetylthiocholinesterase (AchthE) in various tissue fractions from guinea pig terminal ileum.
2 citations
TL;DR: During the course of a systematic analysis of the cardiovascular system in cats and of the effect that NA may have on it, an unexpected effect of papaverine came to light, and its description is presented here and a more detailed analysis will follow.
TL;DR: The time-lag for testosterone action on the sugar transport in the rat levator ani muscle can be explained by the involvement of at least two different and subsequent steps, the earlier one is sensitive to cycloheximide, the later one to denervation.
TL;DR: In this paper, statistical properties of the least square unweighted interpolating polynomials for a class of simple stochastic processes are considered, in particular the covariance kernel of the interpolating process, as well as the correlation matrix of its parameters.
Abstract: Some statistical properties of the least square unweighted interpolating polynomials for a class of simple stochastic processes are considered. In particular, the covariance kernel of the interpolating process is evaluated, as well as the correlation matrix of its parameters. Numerical tables, useful in numerical computations for the equispaced denumerable case, are supplied.