Tag: "males" at biology news
A mane is a pain, but worth it for male lions
...onder or shorter-maned compatriots, but when rival males
threaten or females are checking out potential sui...black and can be up to a foot long. Maneless adult males
occasionally are observed in the Serengeti Plain of Tanzania, and lions in Kenya's Tsavo National Pa...
Anti-inflammatory drug reduces growth of cancerous tumors In rats
...increase in lung tumor growth, and tumor growth in males
increased by 350 percent. Two doses of indomethaci...g or 4.0 kg) reduced the tumor development in both males
and females by up to 63 percent. The scientists also found that rats undergoing surgery showed suppr...
When mistreated children act out later in life: Brain gene may play a role, study says
...xperience of maltreatment," Moffit said. Among the males
in the study, those who had a variation of a certa... reason females are generally less antisocial than males
might be that, with two X chromosomes, they have a better chance of inheriting the high-activity ver...
Gene may protect abused kids against behavior problems
...n psychology professor Avshalom Caspi, studied 442 males
living in New Zealand for 26 years beginning at their birth. The subjects were part of the longitudinal Dunedin Multidisciplinary Health and Development Study started in 1972. The group looked for variations in the MAO A genotype in all participants...
Genes, maltreatment, and the cycle of violence
...to learn from the paper that 85% of the maltreated males
with low MAOA expression exhibited some form of anti-social behavior. But it is critical to note that not all of them do, and even more important, those who do are not anti-social all the time or in every respect. They may be strongly inclined towa...
Regulating human X chromosomes doesn't use same gene as in mouse
...st must be suppressed on one X in both females and males
(which have an X and a Y chromosome). Which gene (or genes) does this is still in question, says Migeon. In mice, researchers elsewhere pointed to the Tsix gene, because it suppressed Xist and was itself expressed only on the active X. However, st...
Sex genes of fish disrupted by common household products
...t in-between stuff," offered Trant. "You might get males
who do not display the correct behavior. In order to mate with a female, he may have to court her, build a nest, chase, or show some dominance. So, even if the concentration of these disrupting compounds in the water are not sufficient to completely ...
Research to estimate pesticides' effects on children
...olling chemicals in the U.S. have used adult white males
as the control target. We're now realizing that was the worst possible choice. You really want the most vulnerable populations: children and pregnant women." Exposure analysis is a relatively young science, he concluded. "We still have a lot to lea...
Researchers develop mouse model of Rett syndrome
...t must also be essential because there had been no males
reported to have the syndrome. (Since males
have only one X chromosome, mutations that knock out the gene's function could be lethal at an embry...
Does that 'java-jolt' affect coffee and non-coffee drinkers alike?
... Nineteen civilian and two military subjects (15 males
and six females) with a mean age of 32 +/- 7 years, height 179 +/- 9.5 cm, and body mass 74.8 +/- 12.6 kg participated in the study. All subjects were active in aerobic events, 13 were regular caffeine users (ingesting greater than or equal to 00 mg...
Normal gene control increases chances human stem cells will be safe
...ntiating cells and developing organisms. By mating males
of one kind of mouse with females of another, the researchers created a set of four mouse embryonic germ cell lines in which it's easy to determine whether a gene copy is from the mother or father. With these cells, the researchers can study and mani...
Hopkins scientists return to the mouse to overcome some obstacles in working with human stem cells
...taken. Their solution to the obstacles was to mate males
of one kind of mouse to females of another kind. From the offspring, the scientists established four new mouse embryonic germ cell lines. Because the parental genes in the lines are distinct and easily identifiable, the scientists can more easily inv...
ICSI: Is it really safe?
... but varying degrees of male bodily features while males
have a normal 46XY chromosome but female bodily features. Abstract no: 0-077 (Monday 15.45hrs CET Hall F2) URL: http://conf.eshre.com/PDF/O-077.pdf ICSI safety innovative US technique eliminates sperm with chromosome abnormalities A...
Possible gene for form of mental retardation, brain development identified
...ation only appears to be present in 1.5 percent of males
with unexplained mental retardation, this percentage is significant," said James Hanson, M.D., Chief of NICHD's Mental Retardation & Developmental Disabilities Branch. "With a total of 30,000-35,000 genes in the human body, the discovery of even a si...
Clemson researchers identify mental retardation gene
...tion appeared to be present in only 1.5 percent of males
with unexplained mental retardation, this percentage is significant," said James Hanson, M.D., chief of NICHD's mental retardation and developmental disabilities branch. "With 30,000 to 35,000 total genes in the human body, the discovery of even a si...
Semen makes you happy
...n," Gallup says. "I understand that among some gay males
who have anal intercourse, it is not uncommon to attempt to retain the semen for extended periods of time," he adds. "Suggesting, of course, that there may be psychological effects." But further research will be needed to confirm whether exposure to ...
Humanity's din could be blocking whales' courtship songs
...es in the bay in the winter of 2000, there were 21 males
and 22 females. Only the males
were singing the very-low-frequency song. The song finding in fin whales ( Balaenoptera physalus ) ...
New gene therapy tool successfully treats mice with hemophilia A
...ease, occurring in one out of 5,000 to 10,000 live males
in all populations and is caused by a defect in coagulation factor VIII. The mutation renders the factor VIII gene non-functional resulting in recurrent, non-predictable, spontaneous bleeding into major joints and soft tissues. Currently, the disor...
Genetic discovery in fruit flies may open new avenues for understanding cancer growth in humans
...dent in the Parkhurst lab. "There were far too few males
in the fly stocks." "In the absence of Sir2, there's the wrong kind of gene expression for the sex chromosomes present. A female can express as if she's a male, and vice versa. That can lead to all kinds of problems. In flies, it leads to death," Par...
Can we enlist substitute genes to fight muscular dystrophy
...he short arm of the X-chromosome, is broken. Since males
only carry one copy of the X-chromosome, they only have one copy of the dystrophin gene. Without the dystrophin protein, muscle tissue cannot compensate sufficiently and will eventually break down. Over-production of utrophin may be a viable alternat...
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