Showing papers by "University of Constantine the Philosopher published in 2007"
TL;DR: The main and most used mineral is Kaolin this article, which is a soft, lightweight, often chalk-like sedimentary rock that has an earthy od. It is white, greyish-white, or slightly colored.
Abstract: Building ceramics are gained by fi ring natural clays which contains various materials. The main and the most used mineral is kaolin. Kaolin is a soft, lightweight, often chalk-like sedimentary rock that has an earthy odor. Besides kaolinite, kaolin usually contains quartz and mica and also, less frequently, feldspar, illite, montmorillonite, ilmenite, anastase, haematite, bauxite, zircon, rutile, kyanite, silliminate, graphite, attapulgite, and halloysite. Kaolinite, the main constituent of kaolin, is formed by rock weathering. It is white, greyish-white, or slightly colored. Kaolinite is formed mainly by decomposition of feldspars (potassium feldspars), granite, and aluminium silicates. The process of kaolin formation is called kaolinization. Kaolinite is a hydrous aluminium silicate. It has a stable chemical structure and good physical properties for ceramic production. It is plastic, during drying phase the shrinkage is low, and its melting point is 1750 °C. After fi ring it has a white color [1 – 5]. 2. Structure of kaolinite
96 citations
TL;DR: The results show that mammary gland specific over-expression mWAP-hFVIII gene construct does not affect reproductive traits of transgenic rabbit males.
24 citations
TL;DR: It was shown that no considerable impact on the general health was found in transgenic rabbits and selected physiological parameters of 3- to 4-month-old transgenic rabbit from F3 generation carrying human factor VIII gene (hFVIII) showed no significant differences.
Abstract: Summary
The aim of our study was to compare the hFVIII mRNA expression in different organs, pathological changes and selected haematological and biochemical blood parameters between transgenic and non-transgenic rabbits from F3 generation. Selected physiological parameters of 3- to 4-month-old transgenic rabbits from F3 generation carrying human factor VIII gene (hFVIII) were analysed and compared with those of non-transgenic ones. Before slaughtering, the blood for haematological and biochemical analysis was taken from the central ear artery. Pathological and histological examination of vital organs and RT-PCR analysis of several tissue organs of transgenic and non-transgenic animals were performed after slaughtering. Except for the mammary gland tissue, slight hfVIII mRNA expression in the spleen, lung and brain and none expression in the liver, kidney, skeletal muscle and heart of rabbits were recorded. pathological examination of vital organs showed some pathological changes in both transgenic and non-transgenic rabbits which were confirmed by histological qualitative evaluations. Statistically significant lower values of blood haemoglobin in blood of transgenic (11.86 ± 0.86) animals compared with non-transgenic (12.41 ± 1.02, P < 0.05) ones and lower parameters of HCT (39.22 ± 2.44 versus 40.89 ± 2.26, P < 0.01) in blood of transgenic rabbits were observed. Parameters of WBC, RBC and PLT showed no significant differences between the analysed groups. All biochemical serum parameters of transgenic rabbits were higher in comparison with non-transgenic ones. Significant differences were found in the concentration of the urea, AST and GMT between transgenic and non-transgenic animals (P < 0.001) and in the total protein content, the difference was significant at P < 0.05. In conclusion, our results showed that no considerable impact on the general health was found in transgenic rabbits.
16 citations
TL;DR: The results show that although there is a significant somatic distinction between menarcheal and nonmenarchyal girls, it is not able to unambiguously state that menarchesal girls are more psychosexually developed.
Abstract: This study reports on the relation between somatic and psychosexual development in 911 urban girls age 8 to 17 years. Subjects were examined by anthropometric and questionnaire methods. We compared the variability of somatic proportions and indexes in two groups of girls at the same age, but with different levels of maturation (menarcheal vs nonmenarcheal). We also assessed their attitudes and knowledge in spheres of sexuality, partners, and matrimonial relationships. We observed that menarcheal girls differed significantly for several anthropometrical values (body weight, sitting height, gluteal circumference, arm circumference) for some age groups, and we recorded significant differences in values of some indexes (Quetelet-Bouchard, Pignet-Vervaek, BMI). The psychosexual development of the girls was assessed by the questionnaire method. The girls were asked to explain various terms. The main aim of our questionnaire was to detect the existence of a relationship between somatic and psychosexual development, whether knowledge of menarcheal girls is more advanced than knowledge of nonmenarcheal girls. Our results show that although there is a significant somatic distinction between menarcheal and nonmenarcheal girls, we are not able to unambiguously state that menarcheal girls are more psychosexually developed.