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Tag: "relationships" at biology news

Caribbean frogs started with a single, ancient voyage on a raft from South America

...wo nuclear genes in their study, building trees of relationships among the species and timing the divergences of the species with molecular-clock methods. "Molecular clocks work by counting the number of DNA-sequence mutations separating two species and then dividing that number by the rate of change, which is es...

Ice Age extinction claimed highly carnivorous Alaskan wolves

...e researchers to trace the ancient wolves’ genetic relationships with modern-day wolves, as well as understand their role in the ancient ecosystem. “Being able to say all of those things—having a complete picture—is really unusual,” said lead author Jennifer Leonard, a research associate with the Smithsonian G...

From the deep -- Researchers find new species of sea anemone

...rseae in a long-term evolutionary study of genetic relationships among sea anemones. A. pearseae belongs to an extremely diverse group of anemones, Daly said, and comparing the anemones' genetic sequences may clue the researchers in to how the different species evolved over time....

New study examines 'brain's own marijuana'

...o-investigator, Troy Wood, Ph.D., will examine the relationships between stress, stress-related behavior and addiction using a combination of electrophysiological, pharmacological and neurochemical approaches. They believe this study also may lay the foundation for better pharmacotherapy for stress-related mood di...

Scientists discover new life in the Antarctic deep sea

...ife is our first step to understanding the complex relationships between the deep ocean and distribution of marine life." Three research expeditions, as part of the ANDEEP project (Antarctic benthic deep-sea biodiversity), onboard the German research ship Polarstern took place between 2002 and 2005. An intern...

Genome of yellow fever/dengue fever mosquito sequenced

...est of the genome" said Tu. "They evolve different relationships with the genome. Some are genetic parasites; they appear to do nothing except replicate within the genome. Others are used by the host -- the individual organism's genetic machinery --to perform biological functions." TEs may be developed as gene...

Sleep quantity affects morning testosterone levels in older men

...es are needed to determine the importance of these relationships for the health of older adults." Recent studies associate lack of sleep with serious health problems such as an increased risk of depression, obesity, cardiovascular disease and diabetes. Experts recommend that adults get between seven and eigh...

Whiteflies and plant viruses can help each other to speed up biological invasion

An invasive whitefly has developed mutualistic relationships with the plant viruses it transmits and is able to increase its population much faster on virus-infected plants than on healthy plants, whereas its indigenous counterpart is unable to do so, according to the new research carried out at Zhejiang Unive...

Selectivity is ultimate aphrodisiac

...t as this need plays an important role in intimate relationships and friendships, the present study reveals a distinctive anti-reciprocity effect if this need is not satisfied in initial encounters with potential romantic partners." ...

Smithsonian scientists discover new marine species in eastern Pacific

...al Science Foundation, which aims to determine the relationships among all families of crabs and shrimps. Even sof...his biota remains unknown to science? What are the relationships to other world regions? The results of this collection trip will be published in the scientific lite...

ConocoPhillips establishes $22.5M biofuels research program at Iowa State

...oPhillips. "ConocoPhillips is developing long-term relationships with respected academic institutions such as Iowa State to research extensions of traditional energy sources that ultimately will benefit consumers." "We are excited to work with ConocoPhillips to develop a research program that applies Iowa State...

Tracing broken wiring in stroke patients

...g new tool for the investigation of brain-behavior relationships in patient populations. It makes no demands on the subject other than holding still and possibly maintaining fixation and therefore can be acquired even in patients that cannot perform a task?This significantly widens the range of patients that can p...

Biologists produce global map of plant biodiversity

...ours that captures complex diversity - environment relationships on a global scale may assist in a small, but important way so that such a fatal potential failure can be averted." ...

MIT biologists solve vitamin puzzle

...s produced by soil microbes that live in symbiotic relationships with plant roots. During the 1980s, an undergraduate research course taught by Walker resulted in a novel method for identifying mutant strains of a soil microbe that could not form a symbiotic relationship with a plant. Walker's team has now foun...

Fish can determine their social rank by observation alone, study finds

...ning called "transitive inference," in which known relationships serve as the basis for understanding unfamiliar ones. "Transitive inference is essential to logical reasoning," Fernald explained. "It's something that kids generally figure out by age 4 or 5--Mary is taller than Fred, Fred is taller than Pete, t...

Scientists discover new species of distinctive cloud-forest rodent

...tematics and Evolution to resolve the evolutionary relationships among all of these rodents. "The new species is not only a handsome novelty," Patterson said. "Preliminary DNA analyses suggest that its nearest relatives, all restricted to the lowlands, may have arisen from Andean ancestors. The newly discovered...

Satellites shed light on global warming

...ients. Current research is investigating these relationships by exploiting the powerful union of multiple views of the ocean made possible by different instruments like those in the Envisat suite, such as the Radar altimeter, Along Track Scanning Radiometer (ATSR) and Medium Resolution Imaging Spectrometer (ME...

Genomics throws species definition in question for microbes

...ic analysis in the 1990s, our understanding of the relationships between different microorganisms fundamentally cha...h century, molecular biology uncovered the genetic relationships between microorganisms, and some of the secrets of microbes that had yet to be cultured in the lab (...

New study is first to link romantic relationships to genes

...how that compatible genes can influence the sexual relationships of romantic couples. ...

Nonvenomous Asian snakes 'borrow' defensive poison from toxic toads

... into the complex mechanisms underlying ecological relationships and will lead to important insights about fundamental biological questions." ...

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