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Tag: "mosaic" at biology news

Scientists discover unique microbe in California's largest lake

...even this popular evolutionary chronometer canbe a mosaic of genetic information with radically different origins,"Miller says.Using a molecular clock, Miller estimated that the proteobacterial DNAwas obtained by an ancestor of modern chlorophyll-d producingcyanobacteria between roughly 10 and 100 million y...

Variation in women's X chromosomes may explain differences among individuals, between sexes

...s. For one thing, women are known to consist of a mosaic of two cell types that differ in which X chromosome is inactivated. The Y chromosome also endows males with at least several dozen expressed genes that females lack. The incomplete nature of X inactivation, demonstrated in the new study, means that ...

Sugar beet virus mutation requires Texas touch

...ornia researcher. A similar virus, beet soil borne mosaic virus, also was found about the same time. The tw...ania is devastating and found worldwide, while the mosaic virus is not as destructive and is limited to the United States. Growers, breeders and industry off...

Mosaic mouse technique offers a powerful new tool to study diseases and genetics

...cribe a streamlined method for creating a "genetic mosaic mouse"--a rodent whose body is genetically enginee...l animal. Mosaic mice Geneticists have been using mosaic fruit flies for decades. In the early 1990s, scientists developed a more efficient technique that al...

Genetic testing still smart choice, despite uncertainties

...egular cells as they divide. Embryos that become mosaic after their cells divide twice typically stop progressing by the time they have accumulated eight cells. Too many of their cells have chromosomes that don't match and these mixed messages lead the embryo to stop developing, Kovalinskaia said. Embry...

Satellites show Amazon parks, indigenous reserves stop forest clearing

...e Brazilian government created a 5 million hectare mosaic of different kinds of reserves in the Terra do Meio region of Pará state. This connects two existing blocks of indigenous lands into a continuous corridor of protected tropical forest areas of 24 million hectares, the largest in the Amazon and the w...

Plant-derived vaccines safeguard against deadly plague

...'s viral expression system that adapts the tobacco mosaic virus (TMV) to produce a plant-based vaccine against plague. TMV, a common scourge of the plant world, causes widespread plant disease and can damage and mottle the leaves, flowers and fruits of whole crops. In the system, TMV is simply injected int...

More than drought affecting wheat yields

...these samples were diagnosed with the wheat streak mosaic virus. In addition, 50 percent of the samples cont... one of the most widespread years for wheat streak mosaic damage. "Without question, wheat streak mosaic virus is the No. 1 pathogen of wheat year in and y...

Does natural selection drive the evolution of cancer?

.... This variation is evident in tumors, which are a mosaic of many different genetic mutants. The second condition is that the variation must be heritable. This, too, can be seen within a tumor-cell population. When mutant tumor cells divide to replicate, the daughter cells share the same mutations. ...

Chimpanzees found to use tools to hunt mammalian prey

... to the fact that the Fongoli community inhabits a mosaic savannah that is relatively dry, and where red colobus monkeys are absent. This habitat may promote efforts—such as the observed tool use—to obtain meat through other means. The authors point out that the females and immature chimpanzees using the sp...

What recognizes what in plant disease resistance?

...ein confers resistance to infection by the Tobacco mosaic virus (TMV). The authors used N, and the TMV Avirulence gene, p50, to investigate the mechanism of gene-for-gene resistance. Contrary to current models, which propose that recognition of resistance genes occurs solely through their leucine-rich repea...

Study of protein folds offers insight into metabolic evolution

...sm network in MANET). The result is a multicolored mosaic of protein fold evolution. The mosaic shows that modern metabolic networks ?and even individual enzymes ?are composed of both very ancient...

Research identifies protein that signals flowering in squash plants

...he authors then used the potyvirus Zucchini yellow mosaic virus (ZYMV) as a delivery vector to test whether long-distance movement of FT mRNA and/or FT protein was required for floral induction. The choice of a potyvirus vector was important as these plant viruses do not produce sub-genomic RNA species, who...

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