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Tag: "average" at biology news

Computational analysis shows that plant hormones often go it alone

...ctivity of about 22,000 genes, each detected by on average 15 detectors after treatment with the seven hormones, was crunched--not once--but twice, resulting in roughly 14 million data points. "Since we didn't generate any of the data ourselves, we had to perform extensive quality controls to extract meaning...

Light guides flight of migratory birds

...Muheim and Phillips argue that migratory songbirds average the sunrise and sunset intersections of the polarization band with the horizon to find the north-south meridian (geographic north-south axis), providing a reference that is independent of time of year and latitude. The birds then use this geographic ...

Cultural transmission in bats: When listening for dinner, bats learn from their neighbors

... bats rapidly acquired the novel association in an average of 5.3 trials. In the social facilitation and trial-and-error groups, most bats did not approach the call of the poisonous species even after 100 trials. These results suggest that once acquired, novel prey-cue/prey-quality associations could spread ...

Researchers link two more genes to sudden infant death syndrome

... 135 unrelated cases of SIDS -- in infants with an average age of 3 months old -- that had been referred to Mayo Clinic's Sudden Death Genomics Laboratory for molecular autopsy. In each study, two of the 135 cases possessed mutations in either CAV3 or RyR2. SIDS -- the sudden, unexplained death of an infa...

New egg freezing technique offers hope to hundreds of women

...9%, compared with 42.5% using fresh eggs), with an average of 2.3 embryos transferred each time (compared with an average of 1.1 embryos formed from fresh eggs). Eleven healthy babies were born (nine singletons and one pai...

Novel therapy combinations gain ground in treating hepatitis

...onse rates than the control group, experiencing on average a 2.5 to 3.0 log decrease in hepatitis RNA reductions by week 24, a significantly better response than the comparator. No viral breakthrough has been seen to date. However, vomiting and dehydration requiring hospitalization occurred in three patien...

Survivors of childhood polio do well decades later as they age

...f Mayo Clinic, and followed them for 15 years. The average age of participants at the study's start was 53, and the patients were an average of 40 years past their childhood experience with polio. The researchers measured strength and loss o...

Impressive new Impact Factors for BioMed Central's open-access journals

...by BioMed Central now have Impact Factors, and the average Impact Factor for a BioMed Central journal has dramatically increased compared to 2004 figures. A number of BioMed Central's journals have seen their Impact Factors increase in the 2005 Journal Citation Report. Breast Cancer Research's Impact Factor...

Wild bees and the flowers they pollinate are disappearing together

...nt in the Netherlands, where bees have declined on average but hoverfly diversity has increased. In that country there has been a decline in plants that specifically require bees for pollination, but not in plants that can make use of other insect pollinators. Thus the plant declines closely mirror those of ...

'Micro-boxes' of water used to study single molecules

...chemical environment. The water droplets currently average about 300 nanometers in diameter and contain volumes measured in quadrillionths of liters; research is continuing to improve methods for controlling droplet size for different applications. ...

UC Davis researchers move biotechnology closer to replacing electronic pacemakers

...ls because their anatomy and physiology, including average heart rates of about 70 to 80 beats per minute, are similar to humans. In the current study, researchers used radiofrequency ablation to remove the SA nodes in pigs' hearts. This is the same minimally invasive technique cardiologists use in clinic...

Bt cotton in China fails to reap profit after seven years

...h as conventional farmers, which resulted in a net average income of 8 percent less than conventional cotton farmers because Bt seed is triple the cost of conventional seed. In addition to Pinstrup-Andersen, the study was conducted by Shenghui Wang, Cornell doctoral candidate in applied economics and manag...

Food-crop yields in future greenhouse-gas conditions lower than expected

...one levels during the growing season could peak on average at 80 parts per billion (now 60 parts per billion). Older studies, as reviewed by the Intergovernmental Panel on Climate Change, suggest that increased soil temperature and decreased soil moisture, which would reduce crop yields, likely will be offs...

Super-sized cassava plants may help fight hunger in Africa

...grown in a greenhouse, produced roots that were an average of 2.6 times larger than those produced by regular... larger than the roots of a non-modified plant (an average of 198 grams for the biggest roots vs. 74 grams for the roots of the non-modified plant.) The modifi...

Many cleaners, air fresheners may pose health risks when used indoors

...r during the hours spent cleaning would exceed the average federal guideline level for an entire year. These quantities are in addition to the formaldehyde and particulate matter that the person would be exposed to from all other sources and activities during the year. The take-home message from these stu...

New HIV study identifies high-risk subgroups of adolescents

...the most mental health problems were white, and on average 20.46 years old; 27 percent were African American, and 27 percent were Latino. By contrast, the group of boys who reported only moderate numbers of unprotected sex acts, but with higher amounts of substance abuse were, on average, 20.90 years old; 43...

Creating a window on 'oceans in motion'

...s in motion," says Dr. O'Dor. Continental shelves average about 80 km (50 mi) wide, and the edge of the shelf occurs at an average depth of about 200 m (660 ft), where it falls steeply into the deep sea. Salmon and many other mari...

Bacteria beat the heat

...ey observed an increase of about 10 degrees in the average temperature at which the reaction rate peaked. Sch...study shows that enzyme efficiency is tuned to the average temperature of the bacterial habitat, rather than the immediate conditions. This may protect the cel...

One-third of adults with diabetes still don't know they have it

...ricans age 20 and older had diabetes. Because the average age of Mexican Americans is younger than for other groups, the age-and sex-adjusted prevalence of diabetes in Mexican Americans is twice that of non-Hispanic whites and about equal to that of non-Hispanic blacks. IFG and undiagnosed diabetes were a...

UGA study explains peaks and troughs of dengue epidemics

...ou look at all the data together, you see about an average three-year cycle with some seasonal component to it." In addition to helping resolve a long-standing debate in public health, the study, published this week in the early online edition of the journal Proceedings of the National Academy of Sciences,...

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