Tag: "sex" at biology news
Scientists Identify Gene For Sexual Behavior In Male Flies
...at fru is the gene normallycontrolling most male sex
behavior in the fruit fly comes from the factthat ...doublesex" ( dsx )commands the development of male sex
organs and other malecharacteristics, while "fruitless" ( fru ) commands male sexualbehavior. Genes ...
Researchers Find Production Point Of Key Protein In Fragile X Syndrome
...omosome -- half the chromosomepair that determines sex
-- when cells are cultured under specific conditions.The gene was found in 1969, but its relationship to mental retardation wasnot understood. It was sequenced and named the Fragile X Mental RetardationGene in 1991, but its mechanisms remained a myst...
Evolutionary Advantage Found For Sex
...rts in the July 31issue of the journal Nature that sex
helps weed out harmful genetic mutations,increasin...ic mutations than single-sexed yeast. "Why sex
evolved is one of the big unanswered questions of evolutionarybiology," Zeyl says. "This is one of t...
Jefferson Scientists Find Potential Deadly Effects Of Two Missing Cancer-Suppressor Genes
...e answer lies with the X chromosome, one of two sex
chromosomes responsible for sexual development. Somehow, he theorizes, the missing genes throw off normal cell proliferation and development. He believes that by getting a better handle on the mechanisms by which these genes actually can ...
A New Biochemical Link Established Between Stress, Sex And Dominance
...ike colors, the extra muscles and the fully mature sex
organs of a dominant "territorial" male. Stress appears to prevent all but the dominant males from achieving reproductive success. Fernald said that since many species have evolved dominant and non-dominant males, the role of stress hormones in soci...
Testosterone And Working Memory; Epilepsy And Schizophrenia; Toxins And Neuron Death; Oregon Researchers Present Findings At Society For Neuroscience
...overed that older men given supplements of themale sex
hormone testosterone showed significant improvemen... a placebo. Janowsky says the study indicates that sex
hormonesupplementation in men may mitigate the loss of working memory associated withaging. Estrogen...
Regulator Of Fat Thermostat Found
... percentage of fat. Thedifferent concentrations of sex
hormones in men and women also may play a role.Some long-term studies have suggested that insulin elevates leptin levelsslightly. Insulin affects energy supplies by triggering cells to take up glucoseas an energy source. But no jump in insulin levels...
Wake Forest University Study Takes Students In Flight With The Albatross
...boats, biologists also cannot determine the age or sex
of the birds beingobserved or whether they are from Tern or strangers from another nesting area. That's why satellite tracking has proved so effective, Anderson said, recalling the satellite telephone hookup that allowed him to prepare researchers i...
Doublecortin : A Novel Gene Involved In Cortical Development
...tary transmission of genetic markerslocated on the sex
chromosome X in members of three families in which girls hadSCLH and boys had lissencephaly. This genetic mapping approach by linkageanalysis allowed them to confirm that the defective gene responsible for thecortical malformations is located on the ...
Family Ties To Sudden Cardiac Arrest; Study Finds Risk Goes Up 50 Percent
...withthose of healthy individuals with similar age, sex
and other physicalcharacteristics. The study was limited to victims of sudden cardiac arrest whodid not have a prior history of heart disease and whose cardiac arrest was notsecondary to trauma or drug overdose. Data were gathered via interviews wi...
Divorce, Insect Style: Termites Swap Mates
...rest in a better mate. When termites of the same sex
are battling for the affections of the oppositesex, the desired termite ceremoniously grooms each combatant in turn, as if toincite each to fight harder and prove its worth, Shellman-Reeve reports. Almost comical is the reaction of one honeymooning t...
Age-Based Screening Is Cost-Effective Method To Control Chlamydial Infection
...tently used barriercontraception or have had a new sex
partner or more than one sex
partner duringthe past 90 days; and (2) testing women 24 years of age or older who have notconsisten...
Females' Siren Song Initiates Courtship Duets In African Frogs, Columbia Biologists Find
...nged courtship songs and that thesecretion of male sex
hormones, androgens, are responsible for establishing thenumbers and types of cells required for the vocalizations. Connections betweenmale vocal neurons and muscle fibers is weak, but strengthen with use. Dr.Tobias had demonstrated that an isolate...
Leftover Fetal Cells May Affect Development Of Scleroderma
...offer another potential explanation, inaddition to sex
hormones, for the higher incidence of autoimmune diseases inwomen. While these data are not definitive, they are provocative because oftheir implications." Scleroderma, or systemic sclerosis, affects people of all races, with anestimated incidence ...
Women Can Inherit Drinking Problem Too, Study Finds
...ncluded -- for the first time -- twins of opposite sex
as well as twins that wereeither both male or both female. Telephone interviews with the twins were conducted to assess whether theparticipants hadlost control over their drinking, were unable to cut back on drinking or hadsimilar problems with al...
Condom Use In Thailand Dramatically Cuts HIV Infection
...risk forHIV if they had a history of prior STD and sex
with girlfriends and prostitutes. The study was supported by the Rockefeller Foundation (New York), theWalter Reed Army Institute of Research, the Armed Forces Research Institute ofMedical Sciences (Bangkok, Thailand), the National Institute ...
Non-Surgical Treatment Ends Pelvic Pain In Women
...iplesurgeries and psychiatric treatment. And their sex
lives are significantlydisrupted." The problem is made worse in part because many doctors are unfamiliarwith the condition and fail to diagnose it, according to Venbrux, and a fourthof those undiagnosed women undergo unneeded hysterectomy--r...
Dietary Determinants Of Iron Stores In A Free-Living Elderly Population: The Framingham Heart Study
...ee intake had a negative association. As expected, sex
was a strong predictor of serum ferritin--women having significantly lower mean concentrations than men. However, age was not related to serum ferritin in our elderly population. Our results suggest that in typical Western-style diets, a small number...
Among Wrens, Moms Teach Daughters To Call, Dads Teach Sons, Study Reveals
... it shows how soundsbirds produce can reflect both sex
and kinship. He described the "his and her"vocal i...at's important for them tolearn just from the same sex
and not the other." Perhaps the behavior somehow prevents closely related birds frombreeding...
Research Into Cockroach Behavior Could Lead To Better Baits
...the world. Researchers already knew roaches emit a sex
pheromone that helps them find mates and an aggregation pheromone that helps them find safe haven. Miller thought roaches might also use pheromones in scavenging for food. She developed an extract from roach feces and began testing it at UF's Urban E...
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