Tag: "testosterone" at biology news
Testosterone And Working Memory; Epilepsy And Schizophrenia; Toxins And Neuron Death; Oregon Researchers Present Findings At Society For Neuroscience
...older men given supplements of themale sex hormone testosterone
showed significant improvement over time inworking...thoutsupplementation then again after one month of testosterone
supplementationshowed significant improvement in performance and fewer errors than men testedafter o...
Stress Lowers Sperm Count By Overwhelming Cells That Make Testosterone
...ents, "I am ultimately interested inthe control of testosterone
production. Anytime you look at the biosynthesis o... of 11ßHSD-1 toneutralize it, shortcircuiting testosterone
production. Without testosterone,other sperm-making cells do not begin to manufacture sperm. Enzyme ...
Research Finds Alligator Problems Also Evident In Less Polluted Lakes
...ny of the same problems it had seen before: lower testosterone
levels and small penis size in male alligators. In...sociated with reproduction -- the steroid hormones testosterone
and estradiol -- but now we have evidence of disruption in other endocrine-controlled systems," Cra...
High Testosterone Level May Lead Male Junco To Stray From Mate
...copulate with neighboring females? High levels of testosterone
may be part of the answer, according to anew study...nd that male dark-eyed juncos that were givenextra testosterone
during the breeding season were more likely than normalmales to fertilize females other than their m...
Penn Researchers Find Mutation In Prostate Cancer Gene
...3A4 gene because one of its functions isto process testosterone
through the body and because there is a strong correlation between elevated testosterone
levels and thedevelopment of prostate cancer. Rebbeck and his colleaguespredict that a mutation in...
New Study Highlights Hazards On Hormone Disrupting Chemicals
...nt plantshave shownskewed sex ratios and decreased testosterone
levels. Epidemiological studies ofSwedish fishermenshowed an increased low birth weight for infants among mothers with aconsumption of fatty fishfrom the Baltic Sea. "This is not a new problem. We know that hazardous substances are present in theenv...
Cardinals Can Recognize Gender By Song, Columbia University Biologist Finds
...n a laboratory, and, as they developed, found that testosterone
levels shot upin the males at about the time their songs became more stereotyped and lessnasal. Dr. Yamaguchi says that young cardinals have a babbling phase similar tothat in humans, that they then learn songs from older cardinals, and that in thej...
Plant-Based Fat May Reduce Risk Of Prostate Cancer By Altering Testosterone Metabolism, UB Study Shows
...k of prostate cancer byreducing the levels of both testosterone
and certain enzymes that metabolizetestosterone in...tosterols, the typeof fat found in plants, reduced testosterone
in the blood stream by 33 percent. A high level of testosterone
has been implicated as a risk factor...
A Versatile Signal In Vertebrate Embryogenesis: Wnt-4 Regulates Kidney Development, Sex Organ Differentiation, Neuronal Survival And Axonal Guidance
...erentiate in the female gonad. The male sexhormone testosterone
leads to the maintenance of the male sex duct system in thefemale. Additionnally, the anlage of the female duct system, the Mlerian duct,is absent in either sex. The survival, axonal outgrowth and target innervation of sensory neurons dependson facto...
Melatonin Shapes Brain Structure In Songbirds
...rs in the spring iswhat leads to a higher level of testosterone
and prompts males to sing more toattract mates and...very fall. Scientists were able to link the risein testosterone
to actual physical changes in the brain's HVC. But in recent years, Johns Hopkins scientists...
Researchers Identify Mechanism That May Regulate Protein Involved In Sex Differentiation, Stress, Hunger
... andsignaling the receptors to produce estrogen or testosterone
via anothermechanism - perhaps the extracellular signal that culminates in phosphorylation. On another level, the findings regarding SF-1 may have led researchers to a newappreciation for the complexity of nuclear receptor action and how thesefunctio...
Plant-Based Fat Inhibits Growth Of Breast-Cancer Cell Line, UB Researchers Show
...e risk of prostate cancerby reducing the levels of testosterone
and certain enzymes that metabolizetestosterone into more active forms. "If we know how phytosterols work, we can advise people how to modifytheir diets to reduce their risk of cancers, or we could eventually design drugsto target systems t...
Antbird capable of increasing testosterone level when threatened
...ted antbirds (Hylophylax n.naevioides) raise their testosterone
levels when necessary in the "off-season"to boost ...linois,studied the neotropical antbirds, measuring testosterone
levels by blood teststaken at different times over two years in the 10-acre natural habitat of a bir...
Researchers at Cedars-Sinai Medical Center to present first documentation of man-made chemical contaminants in the amniotic fluid of unborn babies
..., as concentrations of DDEincrease, the ability of testosterone
to properly bind and signal target cellsto initiate the functions that they are programmed to carry out decreases. Among the 30 percent of the study population for which DDE levels weremeasurable, concentrations ranged from 0.1 to 0.63 nanograms per ...
Cedars-Sinai medical tip sheet (b)
patch shows promise for treating diminished sexual...omen According to a recent study, an experimental testosterone
patch offers new hopefor women who suffer from diminished sexual function as a result of surgicalmen...
Study finds prenatal exposure to testosterone boosts smoking
...ead, the two have discovered that higher levels of testosterone
--the so-called "male" hormone -- in pregnant smok...portantfinding because it wasn't known before that testosterone
had this effect," Udrysaid. "From a practical point of view, it may be less important because there'...
Genetic mutation tied to increased prostate cancer risk in African-American and Latino men
... words, that it can feed off of male hormones like testosterone
in much thesame way that some breast cancers rely ...id5a-reductase, which controls the "activation" of testosterone
-- i.e., itsmetabolism into dihydrotestosterone (DHT). DHT is an androgen that is some 10to 50 time...
Testosterone, stress may not suppress immune system after all
... long hasmaintained a correlation between elevated testosterone
levels and a suppressedimmune system. After all, ...ssive play such a vital role? "The whole idea that testosterone
and stress suppress the immune system makesabsolutely no sense evolutionarily," says Braude. "Why w...
CYP17 gene proves important in determining bone growth, find University of Pittsburgh investigators
... a minor gene mutation produce more of the hormone testosterone
and mayhave stronger, larger bones, according to J...in thecytochrome P450c17 (CYP17) gene produce more testosterone
and havelarger, stronger bones. CYP17 is responsible for making testosterone, a hormonethat is impo...
Maternal hormone progesterone may be a major player in sculpting male brains,UMass researchers suggest
...alled the medial preoptic nucleus(MPN). There, the testosterone
is converted to another hormone, estradiol.Estradi...n a certain gene. Becausefemales produce levels of testosterone
that are insignificant, their brainsproduce far fewer progesterone receptors....
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