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Tag: "rise" at biology news

Zebra finch males prefer females with exaggerated maternal traits

...been assumed that imprinting itself could not give rise to preferences for novel, exaggerated traits. In their new work, the researchers tested the sexual preferences of zebra finch males that were raised by white parents differing in beak color. For one group of males, the researchers painted the beak c...

What controls stickiness of 'smart' chromosomal glue

...mere. Only in a second stage of meiosis that gives rise to haploid sperm or egg cells do centromeric cohesins become cleaved. This precisely controlled centromeric "stickiness" is essential for the accurate segregation of sister chromatids into separate cells. "The key question we wanted to explore was ...

UCLA researchers develop T-cells from human embryonic stem cells

...ding T-cells," Zack said. This in turn could give rise to gene therapy approaches to treat other diseases involving T-cells. In addition to HIV, for instance, the technique could be used to treat severe combined immunodeficiency, or the "bubble boy disease," which leaves its victims without a working imm...

A new view on Lyme disease: Rodents hold the key to annual risk

...ed nymphs. And though tick survival is expected to rise with precipitation, the models found the highest tick numbers at intermediate precipitation levels. These inconsistencies can be explored by incorporating other variables with documented effects into the approach outlined here. Also surprising, the r...

OHSU study says stem cell 'fusion' occurs in tumors

...genetic instability and have the potential to give rise to malignant cancer. One promising result could be in better understanding the careful balance between rapid and effective regeneration after tissue injury, and minimizing the risk of cancer. This balance can be examined in mouse models of inflammat...

Diabetes research takes wing thanks to long-lived fruit fly

...ocess that underlies diabetes. "Obesity is on the rise dramatically, and after decades of increasing life span among people in the United States, there is talk that life expectancy is actually expected to fall soon, largely due to the epidemic of obesity and diabetes," said Bohmann. "It's a huge health i...

Birds going extinct faster due to human activities

... science - how does a batch of immature cells give rise to an organ as extraordinarily complex as the huma...lionic eminence, which in turn is believed to give rise to a population of early neurons in the developing cerebral cortex, a structure that helps coordinat...

Medium is the message for stem cells in search of identities

... science - how does a batch of immature cells give rise to an organ as extraordinarily complex as the huma...lionic eminence, which in turn is believed to give rise to a population of early neurons in the developing cerebral cortex, a structure that helps coordinat...

Salk scientists get to the root of plant cell fate

...at the top or "apical" end become shoots that give rise to leaves, branches, and flowers. "We want to know how a plant can set aside a root and a shoot pole during embryogenesis and keep these functions separate," Long says. The researchers found that the TOPLESS gene encodes a protein (TOPLESS) that is ...

Massive duplication of genes may solve Darwin's 'abominable mystery' about flowering plants

...n may have disappeared. Any duplicated gene gives rise to two "paralogs," which are each subject to random, independent mutation. Most mutations in a gene's DNA sequence cause a change in the corresponding gene product. But "synonymous" mutations in DNA do not lead to a change in gene product, so natur...

Links between DNA damage and breast cancer studied

...s age group, a bracket that corresponds to a known rise in the incidence of breast cancer. In a second paper, the team studied age-related concentrations of two similar mutagenic DNA lesions and again demonstrated that their occurrence is roughly commensurate with the age at which the incidence of female ...

Methane-belching bugs inspire a new theory of the origin of life on Earth

...ated with catalytic iron and sulfur minerals, gave rise to the first simple biological molecules. The obstacles to this theory are the large number of steps in the biochemical cycles that have been suggested, and the staggering structural complexity of the only known enzyme complexes that drive those reac...

Speeding the search for elusive chromosomal errors

...l for finding the abnormal gene or genes that give rise to a disorder." The research is published in the May 2006 issue of Human Mutation. For many of these rare disorders caused by small errors in chromosomes, improved diagnosis does not mean that physicians can provide more effective treatments, at lea...

Science captures the essence of fruit

...tion techniques ?the same process that helps bread rise or grape juice to become wine - this means that it should be possible for the natural tastes and aromas of fruit to be recreated. According to HortResearch Industrial Biotechnology scientist Dr Richard Newcomb, that's exciting news for the world's ...

Researcher gives hard thoughts on soft inheritance

...at generations later that kind of environment gave rise to birds with long legs. Neo-Lamarckian views of evolutionary change stress the importance of the environment in altering inheritance. "When most biologists hear the name Lamarck or the term soft inheritance, the reaction is, 'Oh my God, here...

Sperm created in the laboratory from embryonic stem cells produce viable progeny

...rentiate into primordial germ cells that then give rise to cells resembling mature egg and sperm cells, known as gametes. However, the functionality of the gametes has not been thoroughly tested and many questions about the viability of these cells remain unanswered. Dr. Karim Nayernia and Dr. Wolfgang En...

Study shows frogs can play key role in stem cell research

...hese features of dividing without limit and giving rise to many types of cell are thus ancient features of early embryonic cells, crucial for the correct development of both frogs and humans." ...

Global warming may have damaged coral reefs forever

...rt to show the long-term impact of sea temperature rise on reef coral and fish communities. Large sections of coral reefs and much of the marine life they support may be wiped out for good, say the international team of researchers, who surveyed 21 sites and over 50,000 square metres of coral reefs in t...

Making a face: A new and earlier marker of neural crest development

...at migrate extensively during development and give rise to many derivatives, including most of the bone and cartilage of the head skeleton, pigment cells of the skin, and cells of the peripheral nervous system. In humans, cleft palate, heart valve malformations and various tumors are among the common ma...

Pathway toward gene silencing described in plants

...er with DNA-FISH to detect the DNA sites that give rise to the siRNAs, Pontes found that half of the team...ay which proteins are sitting on the DNA that give rise to the siRNAs and also the loci that are modified by the siRNAs," Pikaard said. Pontes found the o...

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