Tag: "constriction" at biology news
X-ray images help explain limits to insect body size
...c explanation for what limits size in beetles: the constriction
leading to the legs. A collaborative team of researchers from Argonne's Advanced Photon Source (APS), Midwestern University and Arizona State University wanted to study how beetles' tracheal systems change as their body sizes increase. The team too...
JCI table of contents -- April 5, 2007
... drugs (such as beta-agonists) that reverse airway constriction
(also known as dilation). Airway constriction
and dilation are caused by the airway smooth muscle (ASM) cells contracting and relaxing, processes ...
Nutrients might prevent hearing loss, new animal study suggests
... during and after noise exposure and noise-induced constriction
of blood flow to the inner ear, and may have also reduced neural excitotoxicity, or the damage to auditory neurons that can occur due to over-stimulation. The post-noise nutrient doses apparently "scavenged" free radicals that continue to form long-a...
Active ingredient in common Chinese herb shown to reduce hypertension
... blood pressure in the hamsters. The experimental constriction
of the renal artery increased mean arterial pressure to 161.26.9 mmHg relative to 114.39.2 mmHg in age-matched hamsters. Treatment with 50 g tanshinone IIA/100g body for two weeks reduced the mean arterial pressure from 161.26.9 to 130.07.8 mmHg. ...
Researchers show that veins stiffen as we age
... be due to a functional process, such as a chronic constriction
of the muscles around the veins, or if this decreased flexibility was due to some change in the structure of the veins themselves." To find the answer, the researchers monitored the blood flow through each participant's veins in different scenarios ...
Friendly bacteria in alcoholic milkshake could fight food allergies
...lates allergic responses, such as inflammation and constriction
of airways. Ji-Ruei Liu's team of scientists at the National Formosa University, Yunlin, Taiwan, fed mice the milky drink, and found that after 3 weeks, the amount of ovalbumin (OVA) specific IgE was reduced three-fold. Ovalbumin is an allergenic p...
Lab bits -- August 2006
...ulfite. However, they may be causing a lethal lung constriction
in a specific subset of people. Why these people respond this way and how sulfite causes this constriction
is unknown. Dr. Antoinette Steinacker, researcher at the Institute of Neurobiology at the University...
JCI table of contents: July 27, 2006
...e Angiotensin II, which is known to cause profound constriction
of blood vessels with a resulting increase in blood pressure. Interestingly, in contrast to previous reports the researchers found no evidence that ACE2 plays a major role in the regulation of cardiac structure and function. TITLE: Altered blood pr...
Viagra improves high altitude exercise performance up to 45% for some
...erformance at altitude because it would reduce the constriction
of vessels in the lungs that sometimes occurs at a...hat the responders experienced a greater degree of constriction
of the vessels in the lungs at altitude and therefore benefited more from the vessel relaxation effe...
Chronic neuropathic, 'phantom' pain comes from affected nerve and spinal cord, not brain
...uthor, Peter A. Smith. The paper, "Sciatic chronic constriction
injury produces cell-type specific changes in the ...seem relatively modest." For example, CCI [chronic constriction
injury] did not promote the generation of spontaneous action potentials in substantia gelatinosa neu...
The relationship between lawns and allergies and asthma
..., costing $18 billion dollars annually. Asthma, a constriction
of the muscles lining the lungs is often triggered by rapid allergic reactions and can become life threatening if not treated quickly and properly. Fungal spores, in particular, pose a threat for people with asthma. According to AsthmaNow.com, 9 mill...
Study in Royal Society journal on heritability of female orgasm
...nflicted by females during the first copulation. A constriction
of the male's body, appearing during courtship, in...tship and copulation. The protective effect of the constriction
is specific to wounding from partial cannibalism. With this trait, male redbacks maximize the reprod...
New data demonstrate that Benicar and Benicar HCT significantly reduces systolic hypertension
...ceptor on arterial blood vessels, which results in constriction
and increasing blood pressure. In addition, angiotensin II stimulates the release of another hormone that causes enhanced sodium and chloride (salt) retention, with a resultant increase in vascular water retention and blood volume that also contribu...
Natural relaxant protects against asthma, may yield new therapy
...impaired airway relaxation -- as opposed to active constriction
-- may be a more important cause of asthma than previously recognized. The results may also yield a novel approach to therapy, the researchers said. "In thinking about asthma, scientists have generally focused on processes that actively constrict ai...
Children of mothers with preeclampsia more likely to have pulmonary hypertension
...urn may predispose the offspring to an exaggerated constriction
of the pulmonary blood vessels later in life when triggered by certain conditions, such as life in the oxygen poor environment of high altitude. The increased susceptibility to re-entry pulmonary edema of children of mothers with preeclampsia childr...
14 highlighted physiology papers from IUPS 2005: From 'genomics to functions'
... Estrogen, SERMS reduce asthma impact by halting constriction
Medical College of Georgia scientists showed that...uch as tamoxifen equally prevented the exaggerated constriction
to allergen seen in asthmatic-induced airways. "Estrogens prevent the tracheal hyper-responsiveness ...
Estrogen, SERMS reduce asthma impact by halting constriction
...rs (SERMs), completely abolished abnormal tracheal constriction
in a carbachol test. Carbachol is often used to s...und they were equally able prevent the exaggerated constriction
to allergen seen in asthmatic-induced airways. "This could represent a new and potentially importa...
Statins, other cholesterol depletors, may disrupt hypertension development: UCSD study
... to the disease are dependent on cellular calcium: constriction
of vessels, and uncontrolled cell growth resulting...s may serve as novel therapeutics to reduce vessel constriction
and cell growth associated with increased calcium intake in IPAH," Patel stated. Next steps: Determ...
Researchers discover molecule that causes secondary stroke
...f secondary stroke known as cerebral vasospasm. A constriction
of the blood vessels in the brain, cerebral vasospasm usually occurs three to 10 days following a massive brain bleed known as hemorrhagic stroke. Sixty percent of patients who survive the initial stroke develop vasospasm, and 40 percent of them die ...
Duke researchers uncover genetic link to kidney damage after heart surgery
...of genes involved in inflammation and blood vessel constriction
are strongly associated with kidney damage in patients undergoing major heart surgery, researchers at Duke University Medical Center have found. While renal dysfunction after heart surgery is a common occurrence, until now researchers have been unabl...