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Biomedical subjects

J Dusek

Publications and source records attributed to J Dusek.

At least 145 records · Page 8Linked to original sources
PubMed1982

[Hereditary drusen of Bruch's membrane. II: Studies of semi-thin sections and electron microscopy results].

Examination of a bulbus from a patient with hereditary drusen of Bruch's membrane revealed gradual development of drusen from fingerlike and fungous projections of the basal membrane of the retinal pigment epithelium culminating in large deposits with a conspicuous radial and laminar arrangement. The granular material which formed the drusen contained cellular debris as well as fragments of the fibrous long-spacing collagen. Cells of the pigment epithelium proliferated as metaplastic glial cells with formation of a new stratum separating the layer of cones and rods from Bruch's membrane. Transmembranous fibrovascular proliferation from the choroid into the periretinal space was not encountered and does not seem to play a decisive role in the pathogenesis of the disease.

Choroid↗
PubMed1981

[The problem of cysto-sarcoma phyllodes (author's transl)].

Problems in the diagnosis and treatment of cysto-sarcoma phyllodes in thirteen women are discussed. This is a rare breast tumour which must be regarded as semi-malignant. Its malignancy consists of its tendency to recurrence and the development of distant metastases. Five patients had one or more recurrences and three patients had metastases which were fatal. Radiological and thermographic diagnosis of small tumours is unreliable. It is not possible to distinguish the benign from the malignant variants. Accurate classification depends on histological examination. The authors consider removal of the glandular tissue or simple mastectomy to be the best form of treatment.

Adolescent↗
PubMed1981

[An analysis of stallion fertility based on the number of matings per heat].

The fertility problems were studied in the herd of the English Thoroughbred horse on the Napajedla stud farm. Breeding records for the period from 1880 to 1972 were used as the starting data. The survey comprised 32 stallions. The relationship between fertility and the number of matings was calculated by the chi 2 quantity. The calculated values are highly variable. However, it is generally seen in most of the stallions that the number of matings per heat (i. e. one or several matings) had no significant influence on the pregnancy of mares and on the fertility values of the stallions. A higher variability among the stallions was found both in fertility and in the number of abortions. The evaluation of pregnancy in mares for the period from 1880 to 1972 indicates that its level was significantly higher before World War I than in the post-war period. The results are interpreted in the discussion.

Abortion, Veterinary↗
PubMed1981

[Evaluation of variability of duration of pregnancy in mares].

In a set of mares of English Thoroughbred horse of the Napajedla stock the gravidity length in the time period from 1880 to 1972 was evaluated. The variability of the gravidity length was evaluated in sets which were put together by combination of two age groups with a division of the studied time period into ten-year stages. Variance and sample means of the gravidity lengths in these sub-groups are significantly different in the period under study. In order to eliminate the action of non-genetic influences qualifying the variability of the gravidity length, and to increase the objectivity of their evaluation it is proposed not to calculate with absolute values of the gravidity length, but on the contrary with transformed values: (xi - x) divided by s which would be computed for corresponding year of the foaling period. Another methodical approach to exclude the variability of the gravidity length depending on seasonal influences was based on the use of correction factors which were determined for individual months of foaling, on the basis of the sinusoid form of the curve of the gravidity length in the course of the calendar year. When observing the influence of the age of sires on the gravidity length, the shortening of the gravidity length in dependence on their higher age has been suggested, however this relation was significant only sporadically. The submitted work is a part of a larger theme referring, to the reproduction of horses.

Age Factors↗
PubMed1980

[Estimation of the heritability coefficient of stud fertility].

The breeding documentation of the English Thoroughbred horse breeding farm at Napajedla was analyzed to study some effects acting upon the fertility of studs and mares and the length of gravidity. The heritability of fertility is the subject of this report. The normality of the distribution of fertility was tested by processing 300 data on fertility at the given significance level sup / Fn(xi) - F(xi) / less than or equal to Dn(a). The value of the supreme D(300) = 0.108 is lower than the critical level for alpha 0.05. The estimation of fertility heritability coefficient indicates that h2 = 0.31; the heritability coefficient is at the boundary of low and medium heritability. The method of half-sib correlation was used for the calculation; 25% genetic similarity is involved in this case. The calculated value is an estimate characterizing the evaluated population. In view of the number of the observed studs, this value is regarded as informative. The problems under study are part of a wider range of problems concerning the evaluation of reproduction in the breeding of the English Thoroughbred Horse.

Animals↗
PubMed1980

[The effect of inbreeding on the manifestations of some physiological traits in the Kladrub Black Horse strain].

Inbreeding was used in the regeneration process in the breeding of the Kladrub Black Horse. Inbreeding rate is realized in practice, as related to the manifestation of the selected characteristics of this unique horse population. The evaluation of the effect of inbreeding on conception rate and fertility did not demonstrate any differences between the group of inbred mares and non-inbred mares. The study was conducted in mares used for breeding for 10 years. The results provide evidence that inbreeding causes no depression in this characteristics in the Kladrub Black Horse which would otherwise be the first physiological function in the reproduction process to be altered as a result of inbreeding. The evaluation of the effect of inbreeding on growth rate by comparing it with the standard growth curves which were characterized by the exponential function y = A (1 -- e-k(t-to)) did not indicate any statistically significant differences in growth dynamics between foals with a zero Fx value and inbred foals. This study was based on the evaluation of growth rate in the basic body traits and weight. It is inferred that inbreeding does not reduce growth dynamics of different body measurements and weight. Similarly, the evaluation of the body dimensions and weight of inbred and non-inbred adults showed no significant differences. Similar results were obtained from the evaluation of the relation between inbreeding and body constitution, character, and temperament. All the correlation coefficients are very low, almost equal to zero.

Animals↗
PubMed1980

[The effect of the age of stallions and mares on their fertility].

The study was based on the documentation of the Napajedla Stud Farm of the English Thoroughbred horse for 1888-1972. Evaluating the effect of the age of stallions on their fertility (leaving aside the variability of the age of their mothers), such an effect was found to be significant only in four out of the 26 studs evaluated. In 65% of the selected stallions, the correlation coefficients were found to be negative, but without statistical significance. However, the objective of the study was to evaluate stallions and mares parallelly as to their age variability and fertility. The relationships of the effect of the age of the stallion and of the mare on fertility were evaluated by different modificatons of the value chi2. The prerequisite for the analyses of the effect of different stallion age at a constant age of mares was the calculation of the global chi2 used jointly for the evaluation of the variable age of stallions and mares. The result are varied and report on the individuality of the effect of stallions, giving no clear basis for generalizing any fertility-decreasing tendency with the higher age of the parents. The problem is analyzed from the physiological viewpoint.

Age Factors↗
PubMed1980

[Fabry's disease].

Case reports on three patients with Fabry's disease. Two of them involved necroptic examination, in one case the authors examined bioptic specimens of a 9-years old boy's skin. The material was processed by light microscopy, by electron microscopy, and by chromatography [in one case]. The two fatal cases showed accumulation of glycolipid mainly in cardiac muscle cells, the cause of heart failure. The authors describe the morphology of granules and give a list of their tinction and histochemical properties.

Adult↗
PubMed1980

[Carcinoma of the seminal vesicles].

It is reported on a case of carcinoma of the seminal vesicle in a 32-year-old man. The tumour was diagnosed after complaints lasting 2 months, was removed by operation and underwent a postoperative irradiation. At present the patient is completely symptom-free and without any local recidivations two years after operation.

Adult↗