Tag: "determines" at biology news

Preclinical safety study shows adipose-derived stem cells improve heart function after heart attack

...genated blood throughout the body. It specifically determines the fraction of blood that is ejected out of the left ventricle with each contraction. "We are encouraged by the findings from this preclinical study, which suggest that delivery of autologous, adipose tissue-derived, regenerative cells is safe an...

Students build submarine to track Octopuses

...r of the sub. The amount of water that it takes on determines the sub's buoyancy, allowing it to submerge to any depth. Compressed air tanks on the sides of the sub blow this water out to bring Shadow to the surface. "Right now the buoyancy system is under manual control, but we hope to have it under automatic ...

Human chromosome 5 final sequence analysis released to public

...romosome 5 is similar to a chicken chromosome that determines the chicken's sex, much like the X and Y chromosomes in humans. This finding backs up previous research suggesting that before mammals and birds split 300 million years ago, the sex chromosomes had not yet evolved. After the split, mammals and birds ...

There and back again

...f the cytoskeleton, the framework of elements that determines many aspects of a cell's morphology and structure. The team found that the expression of constitutively active Cdc42 prevented mesenchymal cells from undergoing their normal epithelialization, while interference with Cdc42 function by a specific inh...

New research shows air pollution can reduce children's lung function

... year after age 20. "Lung development in teenagers determines their breathing capacity and health for the rest of their lives," said John Peters, M.D., Hastings Professor of Preventive Medicine at the Keck School of Medicine. "The potential long-term effects of reduced lung function are alarming. It's second on...

Research suggests unborn children may be at risk from environmental pollution

...osure to environmental agents. Placental transfer determines the exposure of the foetus to these agents as a result of maternal exposure. Preece and his team at Bristol set out to determine the extent of placental transfer through a series of bio-distribution measurements and ex vivo experiments using donated...

The insect police: Why social insects punish cheating comrades

...on revolves around relatedness because relatedness determines the magnitude of the payoffs. Based on a detailed comparative phylogenetic analysis of 50 species of ants, wasps, Hammond and Keller now demonstrate that the 'policing' behavior of workers cannot be accounted for just by relatedness as traditionally...

Synthesized molecules studied as weapon to stop cell division in cancer cells

...bit the Pin1 enzyme," said Etzkorn. Protein shape determines biological function. Pin1 works by changing a peptide bond within Cdc25 from the trans shape (a flattened-Z shape) to the cis U-shape and back. This a simple change -- the swing of an arm one way or another to open or close the U results in a large ...

New 'clock gene' uncovered

...way anticipate changes in the seasonsa system that determines when they shed their leaves, produce seeds, and make flowers or fruit. Humans also have circadian rhythms, and we entrain our internal clocks to the 24-hour day. Under normal conditions, we time our major activities with daylight, we sleep during t...

T. rex owes its giant size to the ultimate teenage growth spurt

...ry have seen traveling casts of Sue. This research determines that Sue was 28 years old at the time of death, although the fossil is 67 million years old. For more information on Sue, visit http://www.fmnh.org/exhibits/exhibit_sites/sue/default.html . Of the four types of tyrannosaurids studied in this resear...

Why some animals have smaller eyes: Lifestyle matters

...s it about environments in which animals live that determines eye size? For his part, the Cornell neurobiologist has moved on to a new study of eye size throughout various stages of development. He observes that human eyes grow rapidly in the womb and for the first three months after birth. That explains why ba...

Method to visualize gene activity may provide insight into normal development & genome function

...are active in a particular cell during development determines that cell's fate--what type of cell it becomes. The advance also makes it possible to quantify how active a gene is, and even infer the genetic makeup of an organism. "In addition to facilitating our own research on fruit fly development, there...

LICR/UCSD team solves mystery of centromeres

...en able to show that a particular protein, CENP-A, determines where the centromere is located and copies this same location to a newly synthesized chromosome. The presence of CENP-A turns the centromere into a staff DNA and protein complex, and ensures that the centromere is maintained every time a cell duplic...

Survival strategies in nature

...s, revealing that lipoxygenase-dependent signaling determines host selection for opportunistic herbivores and th...ort an exciting discovery about a plant trait that determines the composition of the herbivore community, which was made by genetically silencing different compon...

Joslin researchers identify key molecule in Type 1 diabetes progression

...s reveals one of the key biochemical pathways that determines whether type 1 diabetes will remain in its early stages or progress to full-blown disease, possibly explaining why some people develop type 1 diabetes more rapidly than others. The study was published earlier this month in The Journal of Experimenta...

Nanoscale contact optimizes adhesion

...t in both situations. A question thus arises: What determines the adhesion strength? The chemical nature of materials cannot explain why the same van der Waals force results in strong adhesion in gecko but not in human. Apparently, nature has evolved mechanisms to utilize weak van der Waals forces in animal spe...

Promising research: From employment issues to virology

...ion, the distribution of electrons among the atoms determines all of the chemical characteristics of a material. The new Priority Programme "Experimental Electron Density as the Key to Understanding Chemical Interaction" deals with determining the distribution of electron density in different chemical compounds...

Many physicians misperceive radiation risks to developing fetuses from X-rays and CT scans

...dosage of radiation, measured in milligrays (mGy), determines whether there is interference with the normal development of a fetus. Adverse fetal affects from radiation exposure include small head, mental retardation, or fatal childhood conditions. The study states that fetal doses exceeding 150 mGy between the...

Domesticated tree crops may be the 'future of forestry'

... developmental genetics, the field of biology that determines which genes activate various processes and pathways in living organisms. Classical approaches typically require the production of numerous mutant plants and the identification of genes responsible for traits that differ between mutant and normal plan...

Is that plant a tortoise or a hare? Answer predicts its response to environmental change

...adeoff for every leaf, and the strategy it follows determines how it reacts to change." Besides Reich, authors of the paper were Ian Wright (first author) and Mark Westoby of Macquarie University, Australia, Jeannine Cavender-Bares and Jacek Oleksyn from the University of Minnesota, and a long list of researche...

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