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Tag: "growth" at biology news

Hormones and growth: The control of body size and developmental growth rate in fruit flies

...ue. The researchers found that by manipulating the growth of specific cells within the gland, they were able... the authors propose that under normal conditions, growth of prothoracic gland during development helps larval flies determine when a critical body weight has...

Lands surface change on Alaska tundra creating longer, warmer summers in Arctic

..., and a corresponding northward progression of the growth of shrubs and trees, may be creating a cycle of warmer and longer summers in the Alaskan Arctic according to a new study to be published in the Sept. 22, 2005, issue of Science Express. The resulting atmospheric heating in the region of northern Ala...

One bacteria stops another on contact

...henomenon in which one bacterial cell can stop the growth of another on physical contact. The bacteria that ...ions, contains genes that when turned on block the growth of other E. coli bacteria that they touch. The finding was a complete surprise to the scientists, sa...

AACR Favors 'full spectrum of stem cell research biology'

...l research will elucidate critical aspects of cell growth and differentiation that are altered during the formation and growth of tumors. # Research on tissue-specific stem cells from adults may reveal the body's innate mainte...

Newfound roadblock to interferon effectiveness against malignant melanoma

...understanding the molecular events that govern the growth of this type of cancer and the changes in gene exp...ect of interferon. Interferon normally impedes the growth of cancer cells, whereas STAT5 is thought to act to promote cellular growth. The new work, publishe...

Once given 'no respect,' cells' tiny RNAS take driver's seat

...bed, has the potential to very potently drive cell growth and cancerous proliferation." Among the genes Myc controls is one called E2F1, which, like Myc, also controls the expression of genes. One of the genes controlled by E2F1 just happens to be the gene for Myc. "This establishes a feedback loop," says...

Vineyard weeds found to host Pierce's disease of grapes

...mental conditions have a major impact on bacterial growth in host plants. "Multiplication and systemic movem...ary considerably among plant species in supporting growth and movement of the bacterium," Wistrom said. In addition, she noted that the joint lab and field e...

Ants, not evil spirits, create devil's gardens in the Amazon rainforest, study finds

... gardens grew by 0.7 percent per year. "Using this growth rate, we estimate that the largest devil's garden ...ling plants of other species, the ant promotes the growth and establishment of D. hirsuta, thereby gaining more nest sites." The plants also benefit by incre...

Muscle repair: Making a good system better, faster; implications for aging, disease

...lasminogen system interacts with the inflammatory, growth factor and other systems in a complicated manner, ...(or) by regulating the bioactivity of a variety of growth factors." Role of macrophages likely important Confirming earlier studies indicating a critical ro...

Pollution-eating bacteria produce electricity

...ectricity. A bacterial spore is a dormant stage of growth for the organism and is highly resistant to heat, radiation and drying. Such characteristics could prove useful in future microbial fuel cell designs where the device need not always be operational but must survive long periods of hazardous condition...

After the yeast is gone bacteria continue to develop flavor of sparkling wine

... affect wine flavor and serve as nutrients for the growth of bacteria. Although yeasts have the dominating i...consumer acceptability of the wine could be due to growth and lysis of bacteria," says Rius. ...

Researchers find molecule that inhibits regrowth of spinal nerve cells

...to the tissues. Not only does myelin encourage the growth of scars ?called glial scars ?which physically block nerve cells from regrowing in the damaged area, but components of myelin also chemically prevent nerve cells from regrowing there as well. Considerable research has been done in the past 10 years ...

Traditional models underestimate extinction rates

...s for predicting extinction assume that population growth and decline are governed by random, or stochastic, variables. But few scientists have actually tested the accuracy of these models with empirical data. To do this, Drake first manipulated the available food sources in 281 populations of water fleas, ...

Simple explanation for complex pattern of feather development

...al model of the mechanism birds use to control the growth of complex feathers found that plumed feather stru...rowth. "Understanding these mechanisms of feather growth gives a whole new perspective on the unique beauty of feathers," said Richard Prum, senior author on...

Two designer drugs hit same lung cancer target, but only one is effective

...ng their ability to shut down a mutant, overactive growth signal in lung cancer cells, reports a team headed...containing a normal but overactive EGFR (epidermal growth factor receptor) molecule, only gefitinib (Iressa) killed lung cancer cells containing a mutated EGF...

From a Few Wild Ancestors, a Citrus Cornucopia

...by Southeast Asia—is experiencing rapid population growth and development,?says Krueger. He hopes to travel to southern China to assess firsthand the amount of citrus diversity still present there. Molecular techniques now available should make the task of recognizing novel citrus specimens much easier. As...

Neanderthal teeth grew no faster than comparable modern humans'

...of Newcastle . They found that the rate of tooth growth present in the Neanderthal fossils they examined w...ns of modern humans. And since the rate of tooth growth has become a more-accepted tool for estimating the length of childhood among hominids, the finding i...

Stem cells bring fast direct improvement, without differentiation, in acute renal failure

...that it facilitates the delivery of renoprotective growth factors and cytokines to the sites where kidney ce...mplied by their demonstrated expression of several growth factors such as HGF (hepatocyte growth factor), VEGF and IGF-1, all known to improve renal function ...

Carnegie Mellon cyLab researchers work to develop new red tide monitoring

...is software might range from studying cancer tumor growth to tracking serial killers. "The other very important part of this research is to adapt our findings to homeland security where we may use this method to track the bioterrorism activities pertaining to the nation's waterways." Cai said his NASA/ESTO...

Gradient guides nerve growth down spinal cord

...nect with other nerve cells. Axons are tipped with growth cones, bearing specific receptors, which detect ch... These nerves have a receptor on the tips of their growth cones, known as Frizzled3, which responds to Wnts. In this paper, the researchers show that the ner...

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