Effect of Hypophysectomy and Estrogen Treatment on Long Bone Fracture Healing of Young Domestic Fowls

Author Institution: Department of Anatomy, College of Medicine, The Ohio State UniversityNEGULESCO, JOHN A. AND JOHN A. EGLITIS. Effect of hypophysectomy and estrogen treatment on long bone fracture healing of young domestic fowls. Ohio J. Sci. 75(5): 217, 1975

Hepatic and Cardiac Weight Adjustments of Young Female Chicks Subject to Estrone and Hypergravity

Author Institution: Department of Anatomy, College of Medicine, The Ohio State UniversityRhode Island Red female chicks, 2 weeks post hatching, were maintained for 2 weeks at either earth gravity or 2 g hypergravity. Control animals were injected with 0.2 ml saline and estrone treated groups with 0.2 mg or 0.4 mg of estrone daily. Animals were sacrificed following the last injection on day 15 and their livers and hearts were removed immediately, dissected free of connective tissue, weighed and frozen. Exposure to the effects of the 2 g hypergravity for 2 weeks resulted in decreased total body weight regardless of whether the animal was supplemented with or lacked hormonal treatment. Estrone at 0.2 or 0.4 mg had little effect on the noncentrifuged bird's weight. Liver weight was increased with estrone treatment in the normogravity animals but not in animals exposed to 2 g, except when treated with 0.4 mg estrone. Heart weight was unaffected by the experimental procedures used

Université de Paris. Faculté de droit. Le Problème juridique de la personnalité morale et son application aux sociétés civiles et commerciales... par Démètre Negulesco,...

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Rumania's sacrifice; her past, present, and future,

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Mechanical and Self-Healing Performances of Asphalt Mixtures Containing Recycled Asphalt Materials and Light-Activated Self-Healing Polymer

The objective of this study is to evaluate the efficiency of a new generation of ultraviolet (UV) light-induced self-healing polymers in enhancing the durability of asphalt mixtures and improving their self-healing capabilities. Mixtures were prepared using two different binders, with and without recycled materials, and self-healing polymers. Results showed that the addition of recycled asphalt materials to mixtures prepared with an unmodified binder (PG 67-22) negatively affected healing recovery at room temperature. The self-healing properties of the mixtures were improved by increasing the healing temperature from 25°C to 50°C, which indicates the temperature dependency of the self-healing properties of asphalt mixtures. The addition of 5% self-healing polymers to the control mixture followed by 48 h of UV light exposure resulted in an increase in the self-healing properties of the mixtures prepared with PG 67-22 binder. Semicircular bending (SCB) test results showed that the incorporation of self-healing polymer and 48 h of UV light exposure improved the cracking resistance of the mixture. Loaded-wheel tracking (LWT) test results showed that the addition of the self-healing polymer caused an increase in the rut depth of the samples prepared with the unmodified binder. However, the final rut depth was less than 6 mm, which is an acceptable rutting performance. Thermal stress restrained specimen test results showed that self-healing polymer improved the low-temperature cracking performance of the mix by increasing the fracture load and decreasing the fracture temperature

Laboratory testing of self-healing microcapsules in asphalt mixtures prepared with recycled asphalt shingles

Self-healing products such as microcapsules filled with an asphalt rejuvenator present an emerging technology that would allow asphalt mixtures to resist cracking damage caused by vehicular and environmental loading. The objective of this study was to characterize laboratory-prepared microcapsules in order to evaluate thermal stability as well as the self-healing effectiveness of the microcapsules in asphalt mixtures. A three-point bending test was used to evaluate the healing efficiency and stiffness recovery in asphalt mixtures under two healing conditions: room temperature and high temperature. An optical microscope was used to quantify the healing progress of cracked specimens as a function of time. Based on microscopic characterization, it was observed that the produced microcapsules had adequate thermal stability because the microcapsules showed no sign of breakage when exposed to high temperature. An analysis of microscopic images revealed a reduction in the size of the cracks for both healing conditions for a period from 0 to 6 days. A lower healing efficiency was observed for the mixture with microcapsules compared with the control because not all microcapsules have broken during the test and are designed to break over time and not all at once. Results also showed that there was a recovery in the stiffness of the mixtures because the healed stiffness was greater than the damaged stiffness but less than the undamaged stiffness. A greater stiffness recovery was observed at high temperature, which could be explained by binder aging during the 5-day conditioning period