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Matching of gas exchanger structure and function with activity and environment in air-breathing fishes. This project will investigate the physiology and structure of Australian fishes that use gills and breathe air. It will measure the partitioning of oxygen and carbon dioxide exchange between the aquatic (gills) and aerial (lung, swim-bladder or mouth) respiratory organs, in relation to dissolved oxygen in the water and metabolic energy demands by the fish. Rates of gas exchange, biochemical ....Matching of gas exchanger structure and function with activity and environment in air-breathing fishes. This project will investigate the physiology and structure of Australian fishes that use gills and breathe air. It will measure the partitioning of oxygen and carbon dioxide exchange between the aquatic (gills) and aerial (lung, swim-bladder or mouth) respiratory organs, in relation to dissolved oxygen in the water and metabolic energy demands by the fish. Rates of gas exchange, biochemical characteristics of the blood, anatomy and physiology of the exchange organs, and respiratory/locomotory coupling will be measured in three selected species during graded exercise. The results will help us understand the factors influencing the evolution of air-breathing.Read moreRead less
Environmental Control of Developmental Plasticity of Vertebrate Cardio-Pulmonary Systems. Our research will generate the first comprehensive picture of how environmental conditions are transduced to control the development of the vertebrate respiratory and cardiovascular systems over the perinatal period. The research will demonstrate how physiological systems are modified and hence evolve. Moreover, understanding the developmental pathology in embryos induced by changing environmental condition ....Environmental Control of Developmental Plasticity of Vertebrate Cardio-Pulmonary Systems. Our research will generate the first comprehensive picture of how environmental conditions are transduced to control the development of the vertebrate respiratory and cardiovascular systems over the perinatal period. The research will demonstrate how physiological systems are modified and hence evolve. Moreover, understanding the developmental pathology in embryos induced by changing environmental conditions (especially exposure to steroid-like pollutants) is crucial to support breeding programs of endangered species and may improve veterinary and medicinal treatment of premature animals and humans. This multi-disciplinary, international collaboration provides an international training ground and two-way exchange of students and postdocs.Read moreRead less
Cell-free immune reactions and suppression. Insects pests and insect vectors of diseases are managed by toxic substances, but insects have a cunning ability to persist. How pesticide-tolerant insect pests recognise and inactivate chemical and biological toxins is poorly understood. While vertebrates with a closed circulatory system use coagulation reactions mainly for wound-healing, invertebrates employ cell-free aggregation reactions for the sequestration and inactivation of potentially damagin ....Cell-free immune reactions and suppression. Insects pests and insect vectors of diseases are managed by toxic substances, but insects have a cunning ability to persist. How pesticide-tolerant insect pests recognise and inactivate chemical and biological toxins is poorly understood. While vertebrates with a closed circulatory system use coagulation reactions mainly for wound-healing, invertebrates employ cell-free aggregation reactions for the sequestration and inactivation of potentially damaging objects and substances. We use insect plasma to dissect recognition and inactivation of damaging objects and substances with the aim to understand tolerance and its inhibition to design novel strategies in delaying tolerance to pesticides in insect pests.Read moreRead less
What's bred in bone: effects of thyroid hormone supplementation on bone growth and remodelling in ectotherms and endotherms. Influence of resting metabolic rate (RMR) and exercise activity on bone microstructure is investigated in a variety of amniote taxa. By varying the dose of supplemental triiodothyronine (T3), ectotherms are made hyperthyroid with elevated RMR, and endotherms - hypothyroid with depressed RMR. Effects of T3 are compared against those of mechanical loading, in form of increa ....What's bred in bone: effects of thyroid hormone supplementation on bone growth and remodelling in ectotherms and endotherms. Influence of resting metabolic rate (RMR) and exercise activity on bone microstructure is investigated in a variety of amniote taxa. By varying the dose of supplemental triiodothyronine (T3), ectotherms are made hyperthyroid with elevated RMR, and endotherms - hypothyroid with depressed RMR. Effects of T3 are compared against those of mechanical loading, in form of increased daily treadmill exercise. Rates of bone growth and secondary remodelling are determined by histological analysis, and correlated with T3 and bone strain levels. The study tests the hypothesis that evolution of endothermy can be inferred from bone microstructure of fossil bones.Read moreRead less
Coping With Pressure: Respiratory Biology of Marine Mammals. Many marine mammals undergo severe, protracted lung collapse during deep dives. They also exhibit prolonged periods of apnea during sleep. In humans, lung collapse and sleep apnea both represent severe respiratory dysfunction. Pulmonary surfactant, a complex mixture that lines the lung, stabilises the lungs in terrestrial mammals, preventing lung collapse. Here, we propose a comprehensive examination of respiratory function in marine m ....Coping With Pressure: Respiratory Biology of Marine Mammals. Many marine mammals undergo severe, protracted lung collapse during deep dives. They also exhibit prolonged periods of apnea during sleep. In humans, lung collapse and sleep apnea both represent severe respiratory dysfunction. Pulmonary surfactant, a complex mixture that lines the lung, stabilises the lungs in terrestrial mammals, preventing lung collapse. Here, we propose a comprehensive examination of respiratory function in marine mammals. This study will significantly advance our knowledge of the diving physiology of Australian marine mammals. A detailed examination of the respiratory and surfactant systems of marine mammals may also reveal adaptations that enable these animals to endure sleep apnea and lung collapse.Read moreRead less
A new paradigm for surfactant composition and function - how do lungs cope with stress? Our research will increase the understanding of the scope of change and precise molecular interactions occurring in the surfactant lipids and proteins of animals under physiological stress. The novel insights will improve the treatment of lung diseases (such as chronic obstructive pulmonary disease and acute lung injury). We have formed a team of international surfactant researchers all experts in state-of-th ....A new paradigm for surfactant composition and function - how do lungs cope with stress? Our research will increase the understanding of the scope of change and precise molecular interactions occurring in the surfactant lipids and proteins of animals under physiological stress. The novel insights will improve the treatment of lung diseases (such as chronic obstructive pulmonary disease and acute lung injury). We have formed a team of international surfactant researchers all experts in state-of-the-art chemical and biophysical technologies relating to surfactant. These collaborations will bring new technological applications to Australia and provide outstanding cross-disciplinary training for postgraduate students and research staff at the interface between animal physiology, biophysical chemistry and respiratory medicine.Read moreRead less