Thesis (doctoral)--Ethnikon kai Kapodistriakon Panepistēmion Athēnōn, Philosophikē Scholē. / Summary in English. Includes bibliographical references (p. xx-xxviii) and index.

Thesis (doctoral)--Ethnikon kai Kapodistriakon Panepistēmion Athēnōn, Philosophikē Scholē. / Summary in English. Includes bibliographical references (p. xx-xxviii) and index.

Factors influencing testicular gonadotropin receptors and testis responsiveness to luteinizing hormone (LH) stimulation were studied during the seasonal sexual cycle of the adult ram. The normal variation in testis content of gonadotropin receptors was mapped out in relation to changes in (1) testis size, (2) testis responsiveness to LH stimulation and (3) mean serum concentration of LH, follicle stimulating hormone (FSH), testosterone and prolactin (PRL). The increase in gonadotropin receptor numbers during testicular redevelopment was preceded by elevated serum concentrations of PRL and associated with increases in both the frequency of endogenous pulses of LH and the responsiveness of the testis to LH stimulation. When serum PRL concentrations displayed abnormal variations in relation to photoperiod, the normal patterns of change in testis LH receptors and responsiveness to LH stimulation were altered. To determine if the increase in gonadotropin receptors was due to increased frequency of LH pulses up regulating homologous receptors, rams were injected, in the nonbreeding season with small, frequent doses of LH. Testis responsiveness was greatly enhanced but occurred independently of changes in gonadotropin receptor numbers or their binding affinities. To determine if the seasonal rise in serum PRL concentration was influencing gonadotropin receptors, endogenous secretion was suppressed by treatment with 2-bromo-X-ergocryptine (CB154) prior to and during testicular redevelopment. This resulted in delayed testicular redevelopment and reduced numbers of testicular LH receptors. Reduced numbers of LH receptors was associated with reduced responsiveness of the testis to LH stimulation. These results support the hypothesis that the seasonal increase in serum PRL concentration initiates testicular redevelopment by increasing LH receptors. Increases in LH peak frequency enhance responsiveness but this occurs independently of changes in gonadotropin receptors.

No description available.

Thesis (Ph. D.)--University of Adelaide, Dept. of Animal Sciences, 1986. / Includes bibliographical references (leaves 191-207).

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No description available.

No description available.

The purpose of this research was to develop a mobile ad-hoc network for collaborative Unmanned Aerial Vehicles (UAVs) based on a mesh networking standard called IEEE 802.11s. A low-cost, small form-factor, IEEE 802.11a based wireless modem was selected and integrated with the existing flight control system developed at Virginia Commonwealth University (VCU) UAV Laboratory. A self-configurable user-space application on the wireless modem was developed to provide functionality to collaborative algorithms, and to monitor the performance of the wireless network. The RAMS simulator, developed at VCU, was upgraded to support the simulation of advanced networking capabilities by integrating with a simulator called ns-3. The reconfigurability and performance of the IEEE 802.11s mesh network was validated and evaluated by conducting real-world flights. The results show that the IEEE 802.11s is a promising solution for collaborative UAV applications.

Includes bibliographical references (leaves 191-207) / xiv, 207 leaves : ill ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Examines the interactions between thyroid hormones and male reproductive function in mature, prepubertal and post pubertal Merino rams. Hypothyroidism or hyperthyroidism was induced in these rams for 8-10 weeks and their reprodroductive endocrine axis and testis functions were assessed. / Thesis (Ph.D.)--University of Adelaide, Dept. of Animal Sciences, 1986