Biomedical subjects

J Malínská

Publications and source records attributed to J Malínská.

At least 19 recordsLinked to original sources

PubMed2000

Ultrastructure of synapses in the supraoptic nucleus of the cat after induced hypothermia.

Ultrastructure of axosomatic (AS) and axodendritic (AD) synapses in the supraoptic nucleus (NSO) was investigated in a group of normothermic cats and compared with another group of cats after short-term induced hypothermia. Quantitative analysis demonstrated a significant decrease of number of AS synapses, smaller size of AD synaptic knobs, shorter length of the synaptic contact and an increase of the active zone. Evaluation of the shape of the synaptic cleft demonstrated an increase of both positive (P) and negative (N) types in hypothermic animals. The observed morphological changes can be ascribed to the decreased synaptic activity in a greater part of the synaptic population and to the increased activity in a smaller portion of synapses.

Animals↗

PubMed1999

An ultrastructural study of the biostimulative effect of He-Ne laser radiation on the early postnatal differentiation of the rat submandibular gland.

Submandibular gland of the rat during the first week of postnatal development was used for the study of the ultrastructural changes after the He-Ne laser radiation. In the experimental group we observed an increase of the dark cells with greater quantity of the granular endoplasmic reticulum and an increased number of specific secretory granules. These changes show positive biostimulative effect of He-Ne laser radiation on the morphologic differentiation of the submandibular gland of the rat in the early postnatal period.

Aging↗

PubMed1992

The nucleus raphe magnus of the cat. I. Quantitative analysis of neurons.

According to the shape of the perikarya six different types of the neurons in the nucleus raphe magnus of the cat were classified: spherical, oval, fusiform, pyramidal, piriform and stellate. According to size small, medium, large and giant cells were described. The spherical neurons are small and the most uniform in the shape and the stellate perikarya are the most variable in the shape and size.

Animals↗

PubMed1992

The nucleus raphe magnus of the cat. II. Quantitative analysis of axosomatic synapses.

Quantitative analysis of axosomatic synapses in the nucleus raphe magnus of the cat showed great variations in their number, shape and size. There exist some relations between the size of perikarya and the number and size of the synaptic knobs. In the small neurons the number and size of synapses was smaller than in the large neurons, but there exist some exception from this rule. The observed morphological differences can be ascribed to different functional significance of various neurons.

Animals↗

PubMed1991

Cytoarchitectonics of some cortical areas of the feline neocortex (a quantitative study in semithin sections).

This paper presents quantitative analysis of the size of neurons in individual architectonic layers of the neocortex of the cat. In semithin sections the area, perimeter and maximal diameter of the perikarya and their nuclei were measured. Eight different cortical areas were evaluated, including the motor cortex (anterior and lateral sigmoid gyrus), the sensory cortex (coronal gyrus and anterior ectosylvian gyrus), the association cortex (lateral gyrus), the auditory cortex (medial and posterior ectosylvian gyrus) and the visual cortex (occipital gyrus). The obtained quantitative data are summarized in tables.

Animals↗

PubMed1989

Quantitative analysis of synapses in the molecular layer of the cerebellum of the cat (a Golgi and electron microscopic study).

Three investigated parts (superficial, medial and deep) of the cerebellar molecular layer in cat show differences in size, number and shape of the synaptic knobs. In the superficial part the synapses are smaller and more numerous than in the deep part. The proportions between the positive and negative type of synapses changes as well, the latter being more frequent in the deep part. The differences are interpreted by different pattern of dendritic trees of neurons (Purkynĕ, stellate and basket cells) present in this layer, whose arrangement was investigated in Golgi preparations.

Animals↗

PubMed1988