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Tag: "rates" at biology news

Reservoirs may accelerate the spread of invasive aquatic species, researchers say

...ander Zanden argue for research aimed at comparing rates of invasion in freshwater lakes and reservoirs that are in similar geographic regions, to determine whether the rate in reservoirs is indeed higher, as predicted. ...

Super predators and mass extinctions

...gain. The period of the cycle depends on mutation rates in the model. The lower the mutation rate, the longer the periods between super predators. For a sufficiently low mutation rate, the model can lead to cycles that correspond to our 26 million year mass extinctions. Previous models that do not show t...

Defenseless plants arm themselves with metals

...umulate metal. They also compared fungal infection rates in both types of plants when grown with or without exposure to the metal nickel. They found significantly higher levels of salicylic acid in the hyperaccumulator compared to the non-accumulator. In addition, while Thlaspi thrived in metal-enriched s...

Emergence of cancer as major cause of childhood death in developing countries is not being adequately addressed

...tive cancer therapy,?Pui said. “And their survival rates are very inferior to rates in countries with advanced health care systems. However, the World Health Organization and many inte...

Technique may allow cancer patients to freeze eggs, preserving fertility before starting treatment

...eggs are warmed after vitrification, fertilization rates with conventional IVF are low. Instead, researcher...n eggs are not frozen. The fertilization and birth rates for vitrified eggs are similar to the rates for control eggs that were not vitrified. For egg freez...

Shift of weather patterns necessitates rethinking of reforestation methods

... comparison of planting methods show that survival rates could be significantly increased by using containerized seedlings and planting in the fall instead of the winter or early spring. In 2000, a Texas Forest Service survey showed Texas had 12 million acres in forest land, all of it in the East Texas Pi...

Insight into DNA's 'weakest links' may yield clues to cancer biology

... break." Organisms normally exhibit extremely low rates of mutation and chromosomal rearrangements. Conditions that elevate genomic instability lead to an increase in cell death and, in some cases, an increased incidence of cancer, Petes said. Earlier work by other researchers had shown that mammalian ch...

Friendly bacteria in humans may protect against HIV

...pped the virus and blocked infection. Due to high rates of mutation, repeated attempts at developing a vaccine to protect against HIV have failed. Inoculating the major mucosal surfaces where HIV transmission occurs with the HIV-capturing lactobacilli may provide a safe and cost-efficient method for preve...

Oceans more vulnerable to agricultural runoff than previously thought, study finds

...rations in the oceans and sustains highly elevated rates of biological productivity." In the gulf, wind-driven upwellings regularly bring nitrogen and other nutrients from the seafloor to the surface, stimulating the rapid reproduction and growth of microscopic algae called phytoplankton. These algal bloo...

Confocal imaging promises early detection of skin cancer

...r. He adds that today’s best skin cancer detection rates are 75 per cent. “Our system can reach 95 per cent, even when used by people who are not skin experts.?/p> Though the project has ended, the partners want to make a smaller version of their prototype system. “We hope to develop a partnership for ...

Product improves peptide identification for proteomics research

...ycle times, enabling collection of mass spectra at rates up to three times faster than its predecessors. "The combination of the new LC/MSD Trap XCT Ultra with Agilent's breakthrough HPLC-Chip/MS technology will set a new standard for protein identification and analytical performance," said Ken Imatani, p...

Low oxygen likely made Great Dying worse, greatly delayed recovery

...lion years ago was preceded by elevated extinction rates before the main event and was followed by a delaye...ly a major reason for both the elevated extinction rates and the very slow recovery. Earth's land at the time was still massed in a supercontinent called Pa...

Scientists reveal the shape of a protein that helps retroviruses break into cells

...lion years ago was preceded by elevated extinction rates before the main event and was followed by a delaye...ly a major reason for both the elevated extinction rates and the very slow recovery. Earth's land at the time was still massed in a supercontinent called Pa...

Too much water may be as dangerous as too little during long-distance athletic events

...ose water and salts from their bodies at different rates during exercise, he said. Heat and humidity also play a role in the rate of this loss. Calculating fluid loss is as simple as weighing yourself before and after exercise and comparing that number to the amount of fluid you consumed throughout. "All...

Bush, Cheney and Rumsfeld are now species of slime-mold beetles -- but strictly in homage

...ose water and salts from their bodies at different rates during exercise, he said. Heat and humidity also play a role in the rate of this loss. Calculating fluid loss is as simple as weighing yourself before and after exercise and comparing that number to the amount of fluid you consumed throughout. "All...

New design : complete

...ose water and salts from their bodies at different rates during exercise, he said. Heat and humidity also play a role in the rate of this loss. Calculating fluid loss is as simple as weighing yourself before and after exercise and comparing that number to the amount of fluid you consumed throughout. "All...

To Stop Evolution: New Way Of Fighting Antibiotic Resistance Demonstrated By Scripps Scientists

... DNA. Evidence for this includes the fact that the rates of mutation in some cells does not seem consistent with the mutation rates associated with DNA replication. Some cells, like bacteria subjected to antibiotics, seem to acquir...

Where bacteria get their genes

...lop new antibiotics, it's important to monitor the rates and patterns of lateral gene transfer," said team member Howard Ochman, a UA professor of biochemistry and molecular biophysics and a member of UA's BIO5 Institute. The research also solves a long-standing evolutionary puzzle. Many scientists have a...

Research shows smoking adds a decade to reproductive age of IVF patients

...of 27kg/m2 or more. Older women had lower success rates no matter what was the cause of subfertility, with.../deh898 [2] The authors point out that the success rates from this data might differ from success rates today, as success rates have increased since 1995 whe...

Researchers pioneer new gene therapy technique using natural repair process

...easily maintained after many cell divisions. "The rates of correction that we see are extremely exciting," said Dr. Porteus, who was recently awarded a 2004 Distinguished Young Researcher Award from the President's Research Council at UT Southwestern for his early contributions to the gene therapy techniq...

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