Articles tagged with Animal Physiology
Giant hummingbirds use more energy for their body size than smaller hummingbirds do, but still below the upper metabolic limit. Asexual fish hybrids have lower physiological performance, possibly due to increased reproductive advantage over sexual dace. Small sea birds hold heat rather than increasing metabolism
Researchers found that walking for one hour a day improved insulin sensitivity, increased adiponectin levels, and reduced oxidative damage in obese individuals with prediabetes. This exercise regimen may help slow the progression of nonalcoholic fatty liver disease.
Daily walks increase insulin sensitivity, improve liver health marker PUI, and boost hormone adiponectin levels, linked to fat-burning effects. The study suggests exercise as a medicine for managing non-alcoholic fatty liver disease.
Researchers found no significant impact of hormonal status on eight voice parameters, contradicting previous studies. Voice samples taken at different points in the menstrual cycle showed consistent characteristics, regardless of hormonal phase.
A recent study found no significant impact of hormonal status on eight distinct voice parameters in women. The researchers assessed 175 voice samples from 35 participants and used computerized acoustical analysis to measure various voice characteristics.
Researchers have found that obesity can impair the body's natural circadian rhythms, particularly in the cardiovascular system. The study suggests that this disruption can lead to a range of health problems, including impaired heart function and an increased risk of disease.
Researchers at the University of Bristol discovered that domestic hens exhibit a clear physiological and behavioral response to mild chick distress, suggesting an empathic capacity. The study used both behavioral and physiological methods to measure these traits in birds.
New research from Karolinska Institutet shows that nitrate improves mitochondrial function in humans, consuming less oxygen and producing more ATP per molecule. This finding has significant implications for sports physiology and may also have positive effects on diseases involving mitochondrial dysfunction.
Scientists studied arctic ptarmigan to understand how they cope with extreme environments, discovering their efficient gaits and energy-saving strategies that could improve domesticated breeds' welfare and meat yield. The research aims to prevent future food security crises by breeding birds that can store energy efficiently.
Researchers discovered that humans share a method of sensing oxygen with the simplest known living animal, Trichoplax adhaerens. This finding suggests that the oxygen-sensing mechanism evolved around 550 million years ago, coinciding with the emergence of complex multicellular animal life.
The mangrove killifish uses its skin to maintain ion balance, exchanging ions through the skin cells called ionocytes. The fish can also adapt to varying salinity levels, with skin ionocytes getting bigger in response to saltwater and returning to normal size when returned to water.
Researchers have discovered that different odorant receptors in mammals exhibit varying degrees of basal activity, driving receptor current fluctuations and firing patterns. This study suggests new information is used by the olfactory system for categorizing odorants, challenging previous understanding of odor coding complexity.
A high-fat Western diet has been found to exacerbate the inflammatory response to sepsis, a condition of systemic bacterial infection. This increased inflammation can lead to severe outcomes, including higher mortality rates and more morbidity in obese patients.
A study by Hebrew University researcher Prof. Guy Bloch found that honeybees can alter their biological clocks in response to changes in their social role, enabling them to make a 'quick switch' in their daily routines. This flexibility is striking, as humans and most other animals struggle with drastic schedule changes.
Research reveals that warmer temperatures in the tropics have a significant impact on life, even with small temperature increases. The study analyzed nearly 500 million temperature readings and found that metabolic rates increase faster in warmer temperatures, leading to greater effects in tropical regions.
Researchers found that coastal animals have a decreased ability to fight off infection of Vibrio bacteria when exposed to low oxygen and high carbon dioxide conditions. This makes them more vulnerable to infection, especially with injuries or wounds exposed to the water.
Researchers warn that increasing global temperatures will lead to devastating effects on desert bird populations, with even minor temperature increases doubling water loss rates and reducing survival times. Small birds may face reduced survival times of up to 30-40% during heat waves.
Researchers found that synchronized male flashing is more recognizable to females, suggesting a physiological problem in the females' information processing. This phenomenon helps maintain the fidelity of the signal in crowded areas with many unrecognizable flashes.
Researchers have successfully visualized lipid ordering in a whole, living vertebrate organism for the first time. The study reveals that membrane lipid order plays an important role in cellular processes and may be linked to human pathologies.
A study using fMRI found that looking at photos of a former partner stimulated key brain areas involved in motivation, reward and addiction. The brain's attachment system showed signs of recovery over time, suggesting hope for those coping with rejection.
A 50-year study on Isle Royale has discovered a significant link between osteoarthritis in moose and early malnutrition, which also affects humans. The research found that moose experiencing malnutrition as young adults are more likely to develop arthritis later in life.
Researchers found that raising juvenile salmon at 16°C causes skeletal deformities. Fast growth temperatures disrupt bone and cartilage production, leading to increased deformity rates. The study suggests temperature-induced growth is severely affecting osteoblasts and chondrocyte cells.
Research shows that cane toads can adapt well to rising temperatures, with their oxygen transport system becoming more efficient as heat rises. The findings contradict previous studies suggesting a decrease in efficiency at high temperatures, and may have implications for other anurans.
A review of studies on IVM fertility treatment suggests that babies born after IVM may be more likely to have larger offspring syndrome and experience difficult births requiring caesareans. The authors urge caution in the use of IVM until further studies can clarify their findings.
A mathematical model reproducing sleep patterns for multiple species suggests the neural circuitry controlling human sleep may be universal across mammals. The study reveals fundamental physiological mechanisms underlying diverse sleep patterns, with implications for understanding evolution and diversity in mammalian sleep.
Researchers at Indiana University School of Medicine successfully treated acute kidney injury in laboratory experiments using genetically reprogrammed cells producing a protein that aids kidney development. The treatment, administered intravenously, showed significant improvements in kidney function and reduced physical damage.
A new study by The Endocrine Society reveals that chemicals remaining in Boulder Creek after wastewater treatment change the gender of fish. Native male fish were found to be feminized, with intersex individuals also present downstream of the wastewater treatment plant.
Resveratrol supplementation has been shown to decrease energy intake by 13% and increase resting metabolic rate by 29% in mouse lemurs. The study demonstrates the compound's potential effects on obesity therapies, providing novel information on its impact on energy metabolism.
A new model developed by researchers predicts an individual's vitamin D requirements based on their skin tone, sun exposure, and dietary habits. The model suggests that individuals with relatively low sun exposure may need additional vitamin D to reach a target blood level of 75 nanomoles per liter.
Robert H. Wurtz's groundbreaking research on visual information processing and eye movements has led to a deeper understanding of how the brain controls behavior. His discoveries have inspired hundreds of scientists to study cognitive processes, including attention and perception.
A Caltech-led team has developed a new method for measuring the body temperatures of extinct vertebrates using rare isotopes in bones, teeth, and eggshells. This technique allows scientists to reconstruct ancient climates and understand how warm-bloodedness emerged in dinosaurs and other species.
Researchers have successfully recreated mammoth haemoglobin using ancient DNA from Siberian specimens. The team's findings reveal unique physiological adaptations that allowed mammoths to survive in harsh Arctic conditions, enabling them to cool their extremities and minimize heat loss.
A study by Amdam et al. found a positive correlation between honeybee associative learning performance and metabolic stress resilience, independent of social factors. The relationship suggests that central nervous system function and metabolic biology can be associated, providing insights into how to reduce human health disparities.
Recent biologging studies reveal surprising behaviors, such as Atlantic bluefin tuna's 5,000-foot dives and elephant seals' annual 40,000-mile migrations. The research also provides insights into ocean animals' physiological parameters, environmental preferences and conservation status.
Scientists at UH found that better food from high-latitude plants may explain why animals grow bigger in cold climates. The study suggests considering ecological interactions beyond traditional physiological responses to temperature.
A study using genetically modified mice reveals a previously unidentified mechanism contributing to heart failure, specifically the decreased release of neurotransmitter acetylcholine. This finding opens up a new avenue for treating failing hearts and highlights the significance of acetylcholine regulation in cardiac function.
Researchers at Kansas State University found that antioxidants can cause harm by suppressing key signaling mechanisms necessary for muscle function. The study suggests that increasing blood flow and oxygen delivery to the skeletal muscle is crucial during physical activity.
Researchers found that naked mole rat brain tissue can survive for over half an hour without oxygen, which could lead to new treatment options for brain injuries caused by heart attacks, strokes, and accidents. This adaptation may also provide insights into how to prevent permanent human brain damage after temporary loss of oxygen.
A study published in PNAS reveals that food intake plays a crucial role in regulating liver gene expression, rather than the body's circadian clock. The findings suggest that consistent feeding schedules can have a significant impact on metabolism and may help explain why shift workers are more prone to metabolic syndrome.
A new study found that rats exposed to fuel vapor from both leaded and unleaded gasoline exhibited increased aggressive behavior. Exposure to either type of fuel vapor led to significant changes in brain chemistry, including fluctuations in neurotransmitters.
A study suggests that many dinosaurs were probably endothermic, athletic animals due to their high energy requirements during walking and running. This trait may have enabled them to thrive in various habitats, including colder regions, allowing them to cover the entire Mesozoic landscape.
Research suggests that many dinosaur species were probably endothermic, with the potential for athletic abilities rivalling those of present-day birds and mammals. This would have allowed them to inhabit colder habitats, but also required a constant supply of fuel due to rapid metabolisms.
Researchers at the University of Maryland have created a fruit fly model to study the genetics of human diabetes. The model uses genetic approaches to delete specific genes involved in insulin production, resulting in elevated blood sugar levels and symptoms similar to human Type 1 diabetes.
A German study has found that wild pigs and deer do not spread genetically modified (GM) corn through their feces or accumulate transgenic residues in their meat. The researchers fed GM-fed wild boars and fallow deer conventional maize, but found no evidence of germinable seeds in their feces.
Researchers analyzed a fossilized tracksite in southern Africa, discovering how early dinosaurs adjusted their movements to cope with slippery and sloping terrain. The study provides insight into the later evolution of the group, highlighting differences in walking styles between ornithischians and theropods.
Dean Franklin, an engineer, and two physicians, Robert Rushmer and Robert Van Citters, pioneered noninvasive imaging and treatment of the heart. They developed devices that measured blood flow, heartbeat dimensions, and blood pressure without cutting open the body.
A new study found that exercise reduces appetite and burns fat first, then carbohydrates, slowing weight regain and overeating. Exercise also prevents the increase in fat cells during weight regain, making it easier to stay on a diet.
A study with hamsters shows that chronic alcohol consumption blunts the biological clock's ability to synchronize daily activities to light. The research suggests that this disruption can have long-lasting effects on the body's internal clock, even after withdrawal from alcohol.
Seabirds face an 'energetic bottleneck' in winter, struggling to find enough food to survive harsh conditions. The study suggests that the birds' high energy demands may be too much to handle, leading to catastrophic losses during the winter months.
Research highlights the gender disparities in stroke risks, with males outnumbering females by two to one, while women's outcomes worsen with age. Women also face disadvantages in stroke treatment, including lower response rates to tissue plasminogen activator.
Researchers found marine mammals have higher myoglobin solubility due to increased net positive charge, and stronger divers have more histidine, aiding lactic acid management. This adaptation helps marine mammals cope with aquatic life demands.
Researchers have successfully created a line of induced pluripotent stem cells from adult pigs, providing a valuable model for studying therapeutic potential and addressing ethical concerns. The pig iPS cells closely resemble human stem cells, making them an exciting emerging field with rapid progression and multiple applications.
Researchers Francois Abboud and Ann M. Schreihofer have unraveled how the brain regulates blood pressure and flow through communication with blood vessels. Their work has led to clinical advances, including a pacemaker-like device to lower blood pressure in hypertensive individuals.
Researchers at Uppsala University and colleagues analyze fossil upper arm bones from ancient vertebrates, revealing two distinct life histories. Ichthyostega, a more terrestrial animal, undergoes significant changes in limb shape and muscle attachments as it grows, while Acanthostega remains aquatic with less dramatic transformations.
Researchers found that chameleons alter their sunbathing behavior in response to their dietary vitamin D intake, regulating UV exposure to maintain optimal levels. The study showed remarkable accuracy in the chameleons' ability to gauge and adjust their UV exposure based on internal vitamin D levels.
A new study by University of Alaska Fairbanks researchers suggests that the size of male crested auklets' crests may be an indicator of their quality as mates. Males with larger crests have been found to have lower levels of stress hormones, indicating they are better equipped to cope with the challenges of reproduction.
A study by Northwestern University researchers discovered the circadian clock genes strongly regulate NAD production, a critical cofactor involved in energy utilization. This discovery sheds light on how aging, metabolism, and the circadian clock are interconnected.
New DNA and hormone sampling techniques have provided unprecedented information about baboons' social behavior, revealing grief, paternal care, and complex kin relationships. Researchers found that male baboons provide parental care, while females form friendships with both maternal and paternal siblings.
Researchers found that carotenoids may improve male sperm quality, promote healthy offspring development, and enhance color vision in birds. They also propose a positive fitness feedback loop where high carotenoid accumulation improves an individual's state and mate selection.
A new study reveals that spitting cobras create complex geometric patterns of venom when striking, which are actively produced by the snake's muscles. This allows them to hit their targets with remarkable precision, making contact with an attacker's eyes where it causes severe pain and possibly blindness.