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Tag: "declines" at biology news

Research on Worms Yields Clues on Aging

...dione did, however, significantly delayage-related declines in neuro-muscular activity. Treated wormscontinued to display the youthful traits of fast body movement and fastpumping of mouthparts during the latter phase of their extended lives.Further tests showed that the anticonvulsants stimulated transmissio...

U-M scientist to talk about tissue engineering at AAAS

...th osteoporosis, a condition in which bone quality declines leaving them fragile and prone to breaking. Parathyroid hormone stimulates bone growth in these patients, and Krebsbach sees potential to use it for similar gains in tissue engineering new bone. Bone morphogenetic proteins help cells differentiate i...

The secret lives of whales

... shows a steadily growing population, with drastic declines only showing up in recent history. “Whales have shown remarkable resilience to cataclysmic events - until the last one ?which is us,?says Palumbi. “Ice ages, sea level change and even loss of local food sources did not interrupt their lives. Living i...

First frozen egg baby born in Canada

...r. Tan. After 30 years of age, a woman's fertility declines and the rate of spontaneous abortion increases significantly. The risks of chromosomal abnormalities, such as Down's syndrome, are also higher in babies produced by older women. Finally, current egg donor programs require matching the menstrual cycle...

To sea or not to sea: When it comes to salmon sex, size sometimes doesn't matter

... that salmon have chances to recover from years of declines "if we would only take our collective foot off their neck." "A great deal of habitat from southern British Columbia to California is no longer accessible to salmon or has been altered to their detriment," he writes in the conclusion of his book publ...

Man-made wetland's effectiveness similar to natural marsh

...s source. "Wetlands' capacity to store phosphorus declines with time," Mitsch said. "But a wetland that reaches that point has extremely rich soil, which could be harvested and spread over a farm field. Or the wetland itself could be turned into a field again, assuming there are other wetlands nearby to take...

Scientists discover global pattern of big fish diversity in open oceans

...but overfishing is the primary driver of long-term declines in the variety of big fish. "This study brings to...up. "If this were the only factor, we might expect declines to be quickly reversible. What they've shown here is that we're on a curvy one-way street, with clea...

Stem cells in bone marrow replenish mouse ovaries

...and thus are born with a finite stock of eggs that declines throughout life. The new report significantly extends earlier work from the same research team reporting the first preliminary evidence that ovaries of mice can be renewed with new eggs in adulthood. The new study suggests an unexpected source for t...

Ocean climate predicts elk population in Canadian Rockies

... positive NPO values translate into elk population declines in the park. Severe weather in the mountains mean...ues and wolf predation were related to 50 per cent declines in the elk population. Hebblewhite noted that positive NPO values and severe weather in the Canadia...

Poaching, logging, and outbreaks of Ebola threaten central African gorillas and chimpanzees

...e action plan, a series of programs needed to halt declines in ape populations will cost just under $30 million. The measures include anti-poaching activities, improved monitoring and response to Ebola outbreaks, increased training, and tourism development. "As dire as the threats are to the survival of gr...

Hospitalizations because of chicken pox down dramatically since implementation of vaccine

...sits declined in all age groups, with the greatest declines among infants younger than 1 year. Total estimated direct medical expenditures for chicken pox hospitalizations and ambulatory visits declined by 74 percent, from an average of $84.9 million in 1994 and 1995 to $22.1 million in 2002. "The data in ou...

Getting an evolutionary handle on life after reproduction

...eproduction, and patterns of senescence, including declines in reproduction. Since guppies are livebearers that provide no postnatal maternal care, Reznick et al. predicted the populations would show no differences in postreproductive lifespan--which is what they found. Though overall lifespan varied among ...

2005 AIDS figures released by WHO and UNAIDS

...nd some countries in the Caribbean region all show declines in HIV prevalence over the past few years with ove...ause for guarded optimism—with some HIV prevalence declines evident among pregnant women, signs of increased condom use among sex workers and expansion of volun...

Earliest European Farmers Left Little Genetic Mark On Modern Europe

...nd some countries in the Caribbean region all show declines in HIV prevalence over the past few years with ove...ause for guarded optimism—with some HIV prevalence declines evident among pregnant women, signs of increased condom use among sex workers and expansion of volun...

'Sharp' older brains are not the same as younger brains

...ere compared with those of older rats which showed declines in their abilities to learn new things. The researchers were looking at a key set of nerve cell connections that store information by modifying the strength of chemical communications at their synapses. (Synapses are the tiny gaps between nerve cells...

Overfishing may drive endangered seabird to rely upon lower quality food

...the late 1940s, and nearly a century before recent declines of anchovies, squid and rockfish. The researchers...iet in the era before the collapse of sardines and declines in other fisheries consisted of a greater proportion of more nutritious foods and fewer lower-value ...

Overfishing in inland waters reduces biodiversity and threatens health

...d. Moreover, overfishing may not immediately cause declines in the total catch––and its weight may even transi...two main types of overfishing. One leads to marked declines in catch per unit effort and size of individuals captured. The second type is characterized by seque...

Marine mammals are on the frontline of failing ocean health

...ing in the pieces of a puzzle." Some suspect that declines of killer whales in Puget Sound may be linked directly to contaminated fish or increased susceptibility to stresses like vessel traffic. Similarly, adverse health effects of PCBs may explain recent observations of pseudo-hermaphroditic polar bears a...

The Amazon in 2050: Implementing the law could save a million square kilometers of rainforest

...ate, although rising initially due to road paving, declines over time, simulating the effects of emerging markets for carbon retain in native forests. Under this scenario, 73 percent of the original forest would remain in 2050. The future expansion of deforestation will not affect all forests and watersheds ...

Confidence in memory performance helps older adults remember

...e find an increase with age in beliefs that memory declines are an inevitable, irreversible, and uncontrollable part of the aging process. These beliefs are detrimental because they are associated with distress, anxiety, and giving up without expending the effort or strategies needed to support memory." In f...

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