Tag: "female" at biology news
Size does matter when choosing a mate
... - for example, male gorillas are much bigger than female
gorillas, whereas male rats are only slightly larger than female
rats. In this new research, scientists from the Universities of Bath, Oxford and East Anglia, carri...
Parasitic cowbirds thrive with a less ruthless strategy than cuckoos
... analyses of the chicks to make sure that male and female
chicks were equally represented in the study. The researchers found that by day eight, cowbird chicks raised with two phoebe chicks were, on average, 14 percent heavier than cowbird chicks raised alone. Also, phoebe parents brought food to nests with...
Manatee population rising in some regions, likely stalled or declining in others
... personnel take photographs, they record whether a female
is with a first-year calf. Because scientists can identify individual adult females from scar patterns, they can reconstruct the female's reproductive history and estimate reproductive rates. Kendall and colleagues found that adult females in the N...
Social benefits of wound healing may not make any difference in animals with multiple partners
...mice. Non-monogamous males mate with more than one female
during a breeding season. The researchers especially wanted to see if social interaction, or the lack of it, made a difference in the rate of wound healing in the non-monogamous mice. It didn't. In fact, levels of corticosterone a stress hormo...
Activated signaling pathway may predict lung cancer patients' response to gefitinib
...P-Akt). P-Akt positivity was associated with being female
and having a history of never smoking. Patients with P-Aktpositive tumors had a better response rate, disease control rate (which includes complete and partial responses and stable disease), and time to progression than patients with P-Akt negative t...
Wheelchairs biomechanics, prosthetic development
... ACSM target heart rate guidelines appropriate for female
wheelchair athletes , pg 415 This study examines heart rate-oxygen uptake rate relationship in female
wheelchair athletes (WAs) to determine the appropriateness of using American College of Sports Medic...
Study: Mothers turn fearless when peptide level drops
... male intruder. Under normal conditions, female
rodents will fiercely attack the males, says Gammie, noting that the males sometimes eat pups and that "the best defense for the mom is the offense." For the study, only the mice that received either no dose or a low dose of the peptide displa...
Whale carcass yields bone-devouring worms
... while examining the two- to seven-centimeter-long female
worms under a microscope, they discovered that mos... The researchers also observed that female
worms of all sizes were full of eggs, which led co-author Vrijenhoek to comment, "These worms appear...
Casanova or caveman: Scientists isolate nerve cells that choreograph male fly's courtship behavior
... order. First, the male senses the presence of the female
and follows her. Then he taps the female
with his foreleg, which triggers pheromone cues. The male then extends a wing and vibrates it, produ...
DNA tests point to extinction of 2 distinctive arctic bird populations
...ing eggs and this camouflage is reversible if the female
loses her eggs or is unable to fertilize them....
Nature mimics industry
...ny ticks, however, has a more alluring effect. The female
of 14 tick species emits a chlorine-containing chemical that is a sex pheromone to attract suitors. After termites munch on wood, they produce chloroform, the same chemical produced when chlorine disinfects drinking water. People, too, make oganohalo...
Research reveals role of gene in infertility
... a team of proteins, resulting in four new male or female
reproductive cells. The researchers conduct their studies with a mutant strain of the model laboratory plant, Arabidopsis, in which the RAD51 gene is unable to function because a piece of foreign DNA is inserted in the middle of the gene. Ma's tea...
West Nile takes its toll on rare bird
...dge was part of a team that monitored radio-marked female
sage-grouse from March 2003 to September 2004 in five sites in Alberta, Montana and Wyoming. They found that populations that had their first exposure to the virus in 2003, had a 25% decrease in late summer survival of females. West Nile virus was c...
Researchers identify gene for a primary form of sudden infant death sydrome (SIDS)
...estes. Females appear to be normal and have normal female
hormones in blood and urine. Despite these differences, male and female
infants with SIDDT died suddenly at the same age. The researchers analyzed the DNA from four of t...
Female infertility cAMP
...Pde3a knockout mouse will be an excellent model of female
infertility for exploring this further....
JCI Table of Contents, 15 July 2004
...Pde3a knockout mouse will be an excellent model of female
infertility for exploring this further. TITLE: Cyc...e phosphodiesterase 3Adeficient mice as a model of female
infertility AUTHOR CONTACTS: Vincent Manganiello NHLBI, NIH 9000 Rockville Pike, Bethesda, Maryland...
When male fish hum, females swim in, thanks to hormones, adaptable hearing
... a natural physiological change that occurs in the female
plainfin midshipman fish (Porichthys notatus) duri... They also identified the estrogen receptor in the female
inner ear where the enhancement begins. "This was especially important since estrogen receptors are ...
Hormone helps fish to mate, may affect human hearing
...out enough estrogen-like hormone in their systems, female
plainfin midshipman fish turn a deaf ear to the al...nell, also identified the estrogen receptor in the female
inner ear where the enhancement of the males' cues begins. As Forlano notes: "This was especially im...
Carnegie Mellon U. imaging study reveals sex-based differences that persist as mice enter adulthood
...s and his colleagues imaged the brains of male and female
mice, aged 1 month (adolescent) and 3 months (adult). Koshibu used a software program to digitally isolate the whole brain and specific structures from the MRM data. These include the amygdala, hippocampus, striatum, and lateral and third ventricles,...
$5 million grant funds partnership, studies of minority-based issues in reproductive health
... participants. One study aims to determine whether female
hormone levels are higher in African-American comp...s than women of other races, have higher levels of female
sex hormones, which also could make the fibroids grow faster. A third study will examine the effects...
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