http://dspace.univ-setif.dz:8888/jspui/handle/123456789/1413 2026-04-15T03:25:21Z http://dspace.univ-setif.dz:8888/jspui/handle/123456789/4913 Titre: Embryonic development intended for third-year Animal Biology and Physiology students. Auteur(s): BENCHIKH, Fatima Résumé: Embryonic development is a meticulously coordinated process in which a single fertilized egg undergoes a series of transformations to form a complex, multicellular organism. This progression involves distinct stages, each governed by specific cellular movements, molecular signaling, and genetic regulation. From the initial fertilization to the formation of tissues and organs, developmental biology provides a detailed map of how life begins and evolves at the earliest stages.The journey starts with the fusion of gametes, where protective envelopes and reserves within the egg play essential roles in ensuring successful fertilization and subsequent development. Following this, the fertilized egg undergoes segmentation, a process where rapid cell division transforms it into a multicellular structure. Key molecular interactions and regulatory mechanisms then guide the process of gastrulation, positioning the three primary germ layers—ectoderm, mesoderm, and endoderm—necessary for forming all tissues and organs. As development proceeds, neurulation leads to the establishment of the neural tube, which becomes the central nervous system. This is followed by organogenesis, where specialized organs form, and morphogenesis, which shapes the embryonic appendages like limbs in birds and mammals. Genetic control mechanisms, such as the expression of Hox genes, regulate these complex processes, ensuring that the developmental plan is executed correctly. 2024-01-01T00:00:00Z http://dspace.univ-setif.dz:8888/jspui/handle/123456789/4787 Titre: التنظيم الهرموني للتكاثر سنة ثالثة ليسانس بيولوجيا وفيسيولوجيا الحيوان Auteur(s): BENCHIKH, Fatima 2018-01-01T00:00:00Z http://dspace.univ-setif.dz:8888/jspui/handle/123456789/4786 Titre: Practical Manual of Hormonal Regulation of Reproduction intended for third-year Animal Biology and Physiology students. Auteur(s): BENCHIKH, Fatima Résumé: Reproduction is a fundamental biological process in all living organisms, essential for species survival. The regulation of reproductive functions in both males and females is complex and finely tuned by various hormones. These hormones orchestrate the growth, development, and function of reproductive tissues, and they ensure successful conception, pregnancy, and birth. In this laboratory course, we will explore the pivotal role that hormones play in regulating reproductive cycles and functions. Through a series of experiments, students will investigate how specific hormones, such as estrogen, progesterone, testosterone, and gonadotropins, contribute to reproductive health and how imbalances in these hormones can lead to reproductive disorders. 2024-01-01T00:00:00Z http://dspace.univ-setif.dz:8888/jspui/handle/123456789/3061 Titre: RÉP ARTITION ET ABONDANCE DE L’ÉRISMA TURE À TÊTE BLANCHE Oxyura leucocephala DANS LES ZONES HUMIDES DU NORD-EST ALGÉRIEN Auteur(s): HALASSI, Ismahan; ELAFRI, Ali; BELHAMRA, Mohamed; HOUHAMDI, Moussa Résumé: Status of the White-headed Duck Oxyura leucocephala in Northeast Algeria. The globally threatened White-headed Duck is one the most rare duck species in the Western Palearctic. Its distribution in Algeria is mainly restricted to the northeastern part of the country and the Hauts-Plateaux. In 2013 and 2014, 694 individuals were counted. The studied sites harboured distinct numbers in winter and in summer of the two years. The p-values (KRUSKAL WALLIS test) were lower than 0.05. The Lake Tonga showed the highest numbers in winter and the Boussedra wetland in summer. The results indicated a stable occurrence in the studied areas without any difference between the two years. The PCA analysis showed a significant correlation between the distribution of this species and three following main factors: vegetation, surface area and water depth at the Boussedra wetland, Lake Tonga and Garaet Hadj-Taher. The lower occurrence in other parts of the studied areas, particularly on the Hauts- Plateaux, is mainly the consequence of drying out process and habitat degradation. Key words: Oxyura leucocephala, Status, Wetlands, Hauts-Plateaux, Algeria (Northeastern). 2019-01-16T00:00:00Z