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You searched for +publisher:"Freie Universität Berlin" +contributor:("Apl.-Prof. Dr. H. Bragulla"). Showing records 1 – 2 of 2 total matches.

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Freie Universität Berlin

1. Lange, Sascia. an immuno-histochemical, lectin-histochemical and morphometric study.

Degree: 2006, Freie Universität Berlin

A multitude of studies support the view that the chick embryo - developing within the egg - is endowed with a high tolerance for oxygen deficiency conditions. This tolerance results from the various adaptive abilities of the embryonic organism. Complementing the physiologic studies of DECKER (2002) and DZIALOWSKI (2002), the present morphologic study rendered new insights into the effect of incubation under reduced environmental oxygen content on the development of the embryonic heart, particularly regarding its cellular and structural components. While developing from a mesoderm-derived tube-like organ to a four-chambered organ, the embryonic heart complying with the growing embryo s needs - displays an increased contractive force as well as alterations in function and effectiveness. A like-wise increased efficiency of the heart is potentially needed under reduced environmental oxygen content and requires qualitative alterations of the cardiac cells, such as differences in the degree of differentiation. It might also induce quantitative alterations within the contracting syncytic cardiomyocytes, i.e. proliferation. The morphometric examination of this study showed that quantitative alterations prevailed within the adaptive mechanisms of the heart. The chick embryos incubated under reduced environmental oxygen content displayed an increase of the mean value cell count regarding three different locations within the heart (left ventricle, interventricular septum, and right ventricle) compared to the respective localisations within the control group. Although these results were only significant for the interventricular septum, they indicate that the reduced environmental oxygen content indeed effects the structural development and differentiation of the embryonic myocardium. This adaptive mechanism results presumably from a reactive hyperplasia of the cells, as well as from an increased mitotic myocardiac activity during a sensitive phase of the chick embryo between the sixth and twelfths day of incubation, respectively. This adaptive potential - like other parameters described in the literature - is detected only temporary, during a distinct developmental stage. The hearts of older chicks shortly before hatching of both, test and control groups, displayed nearly identical mean value cell counts within the selected localisations of the myocardium. Thus, the detected altered morphologic parameter within the test group was balanced towards the end of the prenatal development. The immuno- and lectin-histochemical examination of the hearts - carried out in order to document qualitative adaptations, and differences in the degree of myocardiac differentiation within the working myocard of the chick embryo, respectively - displayed no differences between the test groups. However, age-related reactivity patterns of different antibodies and lectins were detected in the embryonic chick heart. Thus, the immuno-histochemical characterisation displayed differences between the differentiation of the myocardiocytes and the… Advisors/Committee Members: n (gender), apl. Prof. Dr. H. Bragulla (firstReferee), Univ.-Prof. Dr. H. Tönhardt (furtherReferee), PD Dr. B. Tschentke (furtherReferee).

Subjects/Keywords: EMBRYOS; HEART; MYOCARDIUM; MORPHOGENESIS; HYPOXIA; 600 Technik, Medizin, angewandte Wissenschaften::630 Landwirtschaft::630 Landwirtschaft und verwandte Bereiche

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APA (6th Edition):

Lange, S. (2006). an immuno-histochemical, lectin-histochemical and morphometric study. (Thesis). Freie Universität Berlin. Retrieved from http://dx.doi.org/10.17169/refubium-8994

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Lange, Sascia. “an immuno-histochemical, lectin-histochemical and morphometric study.” 2006. Thesis, Freie Universität Berlin. Accessed August 12, 2020. http://dx.doi.org/10.17169/refubium-8994.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Lange, Sascia. “an immuno-histochemical, lectin-histochemical and morphometric study.” 2006. Web. 12 Aug 2020.

Vancouver:

Lange S. an immuno-histochemical, lectin-histochemical and morphometric study. [Internet] [Thesis]. Freie Universität Berlin; 2006. [cited 2020 Aug 12]. Available from: http://dx.doi.org/10.17169/refubium-8994.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lange S. an immuno-histochemical, lectin-histochemical and morphometric study. [Thesis]. Freie Universität Berlin; 2006. Available from: http://dx.doi.org/10.17169/refubium-8994

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Freie Universität Berlin

2. Pütz, Angela Charlotte. Monitoring of seasonal influences, the effect of housing conditions and domestication on the horn quality of the equine hoof.

Degree: 2007, Freie Universität Berlin

In a yearlong field trial the effects of season, housing conditions, nutrition and domestication on the horn quality of the equine hoof were studied. The trial included twenty horses of two different housing systems with clinically asserted good and poor hoof horn quality. The sampling of hoof clippings and measurement of the hoof shape took place at regular intervals in line with the farriery. Furthermore, blood samples, hoof photos and samples of feedstuff were taken on three occasions. Laboratory analysis included physical material examination (water content and horn hardness), light- and scanning electron microscopy, analysis of the fatty acid content of hoof horn and feedstuff via gas chromatography as well as determination of the mineral and trace element status in the blood. In addition, a scoring for an objective assessment of the hoof horn quality was designed. Also the rate of horn production and changes in body weight were determined. Thus, the diversity of the methods employed in the study allowed to judge the interactions of the various factors affecting the horn quality. During the investigation period minor variations of the hoof shape were detected. In comparison with the Przewalski horse (SCHNITKER, 2004) these changes could not be associated with a certain season as they were a result of farriery. Compared to the Przewalski horses the hooves displayed an obtused angle. As described for the Przewalski horse (SCHNITKER, 2004) the rate of horn production was clearly reduced in winter in both stables. Seasonal changes in the water content of the hoof horn and horn hardness were also asserted and these were related to the housing system. In open stable housing the horses possessed the highest horn hardness in summer whereas the least hardness was measured in winter. On the other hand the water content was highest in wintertime. In contrast such seasonal changes could not be observed in indoor housing. Concerning the architecture of the hoof horn no seasonal changes were seen by means of light- and scanning electron microscopy. The architecture of the tubular as well as the lamellar horn was constant within the entire investigation period. An increased incidence of macroscopic and microscopic cracks in the hoof horn was detected in summer. Those cracks appeared frequently in association with a low humidity of the environment and brittle horn. Break-outs at the weight-bearing margin appeared more often in summer than in winter. Physiological horn rings were observed all year round, primarily in the hooves of horses and ponies in open stable housing. These horn rings were more dinstictive in summertime. Using gas chromatography slight seasonal changes in the fatty acid composition in hoof horn and feedstuff were detected. In feedstuff predominantly unsaturated fatty acids were found, whereas in hoof horn near the weight-bearing margin saturated fatty acids dominated. The total concentration of fatty acids in feedstuff and hoof horn declined simultaneously, but a difference in the fatty acid composition… Advisors/Committee Members: n (gender), Apl.-Prof. Dr. H. Bragulla (firstReferee), Univ.-Prof. Dr. K.-D. Budras (furtherReferee), Univ.-Prof. Dr. W.B. Hertsch (furtherReferee).

Subjects/Keywords: horses; equine hooves; horn quality; seasonality of horn quality; domestication; water content; horn hardness; fatty acids; minerals; trace elements; shape of hoof capsule; 600 Technik, Medizin, angewandte Wissenschaften::630 Landwirtschaft::630 Landwirtschaft und verwandte Bereiche

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Pütz, A. C. (2007). Monitoring of seasonal influences, the effect of housing conditions and domestication on the horn quality of the equine hoof. (Thesis). Freie Universität Berlin. Retrieved from https://refubium.fu-berlin.de/handle/fub188/10554

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Pütz, Angela Charlotte. “Monitoring of seasonal influences, the effect of housing conditions and domestication on the horn quality of the equine hoof.” 2007. Thesis, Freie Universität Berlin. Accessed August 12, 2020. https://refubium.fu-berlin.de/handle/fub188/10554.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Pütz, Angela Charlotte. “Monitoring of seasonal influences, the effect of housing conditions and domestication on the horn quality of the equine hoof.” 2007. Web. 12 Aug 2020.

Vancouver:

Pütz AC. Monitoring of seasonal influences, the effect of housing conditions and domestication on the horn quality of the equine hoof. [Internet] [Thesis]. Freie Universität Berlin; 2007. [cited 2020 Aug 12]. Available from: https://refubium.fu-berlin.de/handle/fub188/10554.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Pütz AC. Monitoring of seasonal influences, the effect of housing conditions and domestication on the horn quality of the equine hoof. [Thesis]. Freie Universität Berlin; 2007. Available from: https://refubium.fu-berlin.de/handle/fub188/10554

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.