[Histologic examination of some hippocampus fields after experimental ischemia].

The examinations of rats hippocampus were made after ischaemia (the rats vertebral and common carotid arteries were closed for 20 minutes). Serial sections of the brains were stained with hematoxylin and eosin. 24 hours after completing the experiment a small number of cells in the field CA1 was damaged.

Histological examinations of the influence of 6-hydroxydopamine (6-OH-DA) upon the ileum of the guinea pig.

Examinations of the influence of 6-OH-DA (6-hydroxydopamine) upon the structure of nerve cells and their axons have been conducted by many authors and in various aspects (1, 2, 8, 10). They have concerned histochemistry, fluorescence and ultrastructure of neurons and have shown that the substance evokes various changes in the perikaryons and axons of adrenergic neurons. The wall of the small intestine is innervated by external autonomyous nerves and fibres of the intramural autonomyous plexuses.

Ultrastructural study of odontoblasts of dental pulp in the cells aging process.

Odontoblasts located in the peripheral layer of the pulp reflect current state of the process connected with the formation of the secondary dentin and thereby they protect teeth from inflammatory processes (1, 3, 4, 6, 10). Odontoblasts are highly specialized cells that can react to the mechanical, thermic and toxic and bacterial traumas (12, 13, 14, 15).

[Morphohistochemical examination of white rat kidneys kept on a diet containing electroenergetic ashes].

Kidneys of the rats kept on a diet containing electroenergetical ashes were examined histochemically. An increase in activity of enzymes in cells of kidney canaliculi in animals which were the longest subject to experiment, were observed.

[Examination of gastric juice in animals fed with fodder containing power plant ashes and loess dusts].

Normal metabolism, regulation of stimulation and checking of electrolyte secretion in the gastric juice depend on the way of feeding and its nutritional ingredients. Feeding experimental animals with fodder containing power plant ashes or loess dusts causes a change in the gastric juice reaction, thus resulting in a different assimilation of elements contained in the fodder. There was shown an increase of some elements content (Mg, Na, Cu, Fe), a decrease in the content of some others (Pb,Zn) in the gastric juice and a positive tendency for blocking by calcium ions of heavy metals contained in the fodder by the mucous membrane of the stomach.

Ultrastructural changes in the parotid serous cells of white male rats after experimental encortone.

Mature male rats received encortone in a dose of 1 mg/kg of body mass for 7 days and 30 days. The following changes were observed in the cells of parotid gland of the experimental animals in comparison with the control: a) after 7 days of encortone treatment increase of secretory cells activity appeared in the intensive production and secretion, b) after 30 days of encortone treatment a decrease in secretion production. Moreover, hyperplasia of serous cells, hyperthropy of cell nuclei, pycnosis of nuclei in some serous cells and hyperplasia of epithelium in some intercalated ducts were observed.

[Study of rat behavior in a feeding experiment].

The examination studied behaviour of rats fed on natritive material containing soil dust or electroenergetic ashes. Food containing the dust or ashes was administered to animals in the amount of 30 g a day for 26 weeks. Body weight was controlled in all animals and their motor activity, motor coordination and cognitive activity were examined.

[Morphometric investigations of rat parotid gland after experimental encortone treatment].

The influence of Encortone treatment in the dose of 1 mg/kg of body mass on the secretory segments of male rat parotid gland was investigated. The changes of section area of cell nuclei, secretory cells, serous acini and changes of the number of cells in the acini were statistically analyzed. The observed changes depended upon the period of Encortone treatment.

[Morphological evaluation and analysis of trace elements in the liver of rats who were fed with feed containing power station ashes].

The experiment was carried out on white Wistar rats. The rats in the experimental groups received fodder containing power station ashes for various periods of time (from 6 to 18 weeks). During the experiment, the body weight of rats was recorded, the amount of trace elements in the liver was estimated, and morphological tests of the liver were carried out.

[Effect of progestagens administered during pregnancy on histochemical reaction in fetal liver].

Fetal liver was examined in rats, whose mothers during pregnancy received Turinal (firm: Chemical Works of Gedeon Richter LTD Budapest, Hungary) in a dosage of 0.5 mg/kg BW in the experimental group I and 1 mg/kg BW in the experimental group II. Reaction to the activity of succinate dehydrogenase, lactic dehydrogenase, acid phosphatase, glucose-6-phosphatase, PAS-reaction (Periodic acid Schiff reaction) and hematoxylin-eosin staining were carried out.

[Effect of diet containing soil dust on morphological examination of liver in experimental rats].

Investigations refer to the influence of fodder containing soil dust as one of the ingredients on morphology of the liver and the weight of experimental animals. Fodder containing soil dust was given to animals for various periods of time, the longest was 18 weeks. The results indicate that the intensity of morphological changes in the liver depends on the time of giving fodder.

[Cytoenzymatic studies on the influence of soil dust on the cornea and conjunctiva of experimental animals].

The studies of the effect of the soil dust on the cornea and the conjunctiva of the experimental animals have been performed. The rats were divided into 3 experimental groups and 1 control group. The animals were given 3 different, selected at random, kinds of soil dust to the conjunctival sac 3 times daily for 7 days.

[Statistical analysis of body and lung mass of animals subjected to a single experimental insufflation of soil dust and electro-energetic ashes].

The studies were performed on 44 white female Wistar rats which were intratracheally administered the suspension of the soil dust and the electro-energetic ashes. The electro-energetic ashes were collected from 6 different local heat and power generating plants while the soil dust from several random places of our country. The statistical analysis of the body and the lung mass of the animals subjected to the single dust and ash insufflation was performed.

[Histological studies and clinical observations of the effect of various types of dust on the organ of vision of small laboratory animals].

For seven days, three times a day, female rats were instilled into their conjunctival sacs suspensions of power plant dusts, soil and clay. Clinically observed were inflammatory changes of the conjunctiva and cyclids margins as well as traumatisation of the corneal and conjunctival epithelia, appearing at different stages on the experiment. Cytoenzymatic examinations indicated disturbances of oxidation and reduction processes, changes in dialysis through physiologic membranes and dissociation of protein synthesis.

[Morphological studies of the rat liver after experimental administration of carbon ashes and coal dust].

The experiments were carried out in Wistar rats which were given intratracheally samples of carbon ashes or soil dust in the form of the respirable fraction. The morphologic changes and the glycogen content in the experimental animals' livers were evaluated. The content of the trace elements was determined in the applied carbon ashes and soil dust by means of the X-rays diffraction method.

[Histochemical studies of rat lungs after the short-term influence of soil dust].

There was examined the biological activity of soil dusts using histochemical methods. Intratracheal administration of dusts used in this study is a common method for testing activity of industrial dusts. The used soil dusts were characterized by high content of free silicon dioxide, 3 times higher than its content in dusts from power stations released in the process of burning coal and approximately to the amount in graphite dust.

[Determining acid phosphatase (AcP[E.C. 3.1.3.2.]) and adenosine triphosphatase (ATPase [E.C. 3.6.1.3.]) activity in the lungs of rats following a single administration of ashes from industrial high-heat facilities].

There was examined pulmonary tissue of white rats, which had been administered intratrachealy a single dose of the respirable fraction of ashes sample from 6 different power stations elektrohasting plants and hasting plants in Poland (0.2 ml suspension; 50 mg of the examined sample in 0.6 cm3 of NaCl solution).

[Soil dust as a factor which changes the histochemical picture of the rat lung].

White Wistar female rats only once were administered intratracheally a suspension of the soil dust in the physiologic saline. The respirable fraction of the soil dust was used for preparing the suspension of the latter. The experiment was carried out in 2 groups of rats.

[The influence of coal ashes and soil dust on the activity of two selected hydrolytic enzymes in the liver of laboratory animals].

The effect of a single intratracheal application of the electroenergetic ashes and the soil dust on the liver cell was studied by means of the histoenzymatic methods for the determination of the activities of chosen hydrolases (AcP, E.C. 3.

[Experimental comparative studies of the reactibility of lung tissue to intratracheally introduced ash produced by power plants].

There was analysed the behaviour of the pulmonary tissue in white Wistar female rats exposed to a single effect of electroenergetic ashes from a few Polish power stations, hasting plants and electrohasting plants. The animals received a single 0.6 ml dose of the ashes in suspension of physiologic fluid intratracheally; 3 and 6 months after the experiment, the animals were decapitated and material for examinations was collected.

[Effect of short-term exposure to ash from electric power plants on histochemical reactions of succinate dehydrogenase and lactate dehydrogenase in the lungs of experimental animals].

Histochemical studies of the activity of succinic dehydrogenase (SDH) and lactic dehydrogenase (LDH) in the pulmonary tissue of experimental animals which were given four coal ashes issued from different thermal-electric power stations: group VII--from the thermal-electric power station Siekierki (Warsaw), group VIII--from Wrocław, group IX--from Leg (Cracow) and group XI--from Lódź, were carried out. In particular ash samples the content of trace elements and free silica was determined. The studies yield the following conclusions: 1.