Tag: "antagonistic" at biology news

Good for the goose, not so great for the gander

...exes played out on the genetic level called sexual antagonistic pleiotropy. Because the mitochondrial genome (as well as the X chromosome) is inherited from the mother, evolutionary pressures might have selected for versions optimized for the female body. If the mitochondrial genome is better adapted to the f...

'Fruit fly dating game' provides clues to our reproductive prowess

...ot so simple, at least in their flies. If sexually antagonistic genes, or genes that benefit one sex while harming...archers findings supports the notion that sexually antagonistic genes exert powerful effects and mostly inhabit the X chromosome, which only females pass onto sons....

A little of what you fancy does you no good

...ally lower rates of reproductive success. Sexually antagonistic genes, it appears, may have far-reaching effects o...ncur the cost of less-fit daughters. This sexually antagonistic pattern challenges sexual selection theory predictions that female costs of reproduction are offset ...

Researchers identify neurons that assign value during learning

...ecomes attractive. These findings demonstrate that antagonistic subsets of neurons are responsible for assigning p... interest to see whether this principal concept of antagonistic neuronal populations mediating positive or negative values during learning holds true for much more ...

Researchers map out networks that determine cell fate

...esearchers were then able to identify both sets of antagonistic secondary regulators. Egr-1 and Egr-2 activate macrophage and repress neutrophil genes. Gif-1 is required to turn on neutrophil genes and repress macrophage counterparts. Such counteracting repression circuitry may be the key to understanding ste...

Genetic tug of war determines sexual differentiation

...fate of the early gonads is controlled by mutually antagonistic signals between Fgf9 and Wnt4." Since the Sry gene occurs only in mammals, it is possible that this antagonistic signaling between Fgf9 and Wnt4 may be the mechanism that has remained common in the evolution of al...

War between the sexes influences evolution in some species, say scientists

...n the Z." The scientists explain that the sexually antagonistic maternal-effect genes in ZW species lead to an evolutionary arms race. They state that maternal-effect conflict is increased in ZW species (compared with XY species) because the W, unlike the Y in humans, is expressed in both sexes through the mater...

Mutation in a single gene switches a fungus-grass symbiosis from mutualistic to antagonistic

...uch interactions range from mutually beneficial to antagonistic and are considered to be of major ecological and e... species with Epichlo fungi can be mutualistic or antagonistic or both. In the beneficial interactions, Epichlo endophytes are strictly limited in their intercel...

JCI table of contents October 1, 2005

...), Arsenic trioxide and retinoic acid (RA), can be antagonistic in vitro. In a paper appearing online on September 22 in advance of print publication of the October 1 issue of the Journal of Clinical Investigation, the same group describes a mechanism by which this occurs. Wilson Miller and colleagues from Lady ...

Tips from the Journals of the American Society for Microbiology

...f the organisms native in the soil microflora have antagonistic effects against pathogenic bacteria introduced into soil." (G.S. Johannessen, G.B. Bengtsson, B.T. Heier, S. Bredholt, Y. Wasteson, L.M. Rorvik. 2005. Potential uptake of Escherichia coli O157:H7 from organic manure into crisphead lettuce. Applied ...

A puzzle posed by black-headed ducks yields to persistent biologists

...highly successful brood parasite, unopposed by the antagonistic strategies that host species deploy against more costly parasites like cuckoos and cowbirds. Instead, they found that black-headed duck eggs are often rejected from host nests, and it took four years of detailed field research to figure out why. Lyon...

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(Date:10/29/2014)... they also need protection from its harmful rays, just like ... plants that shields them from sun damage. Now, in an ... , one team reports on the mechanics of how these ... Purdue University note that the harsh ultraviolet radiation plants are ... and, as a result, hinder plant growth. Biochemical tests ...
(Date:10/29/2014)... the safety of nanoparticles is all the rage. Thousands ... examining the question of whether titanium dioxide nanoparticles from ... the body, whether carbon nanotubes from electronic products are ... be or whether nanoparticles in food can get into ... interest is great, research funds are flowing – and ...
(Date:10/29/2014)... bodies decompose, their types and numbers of bugs ... could mean the difference between a closed case ... is using a more than $866,000 U.S. Department ... examine these changing populations. The microbial communities may ... death, gender, race, socioeconomic relations and more, said ...
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