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Tag: "freeze" at biology news

New research indicates a 'troubled' greenhouse is brewing

...ngs indicate it is unlikely that super storms will freeze North America and Europe, as depicted in the recent movie "The Day After." "During the greenhouse spike of 55 million years ago, tropical mangroves and rain forests spread as far north as England and Belgium and as far south as Tasmania and New Zeal...

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

...regnancy is the challenge. In the past, efforts to freeze a woman's eggs, or oocytes, have not worked well b...me procedure that's used successfully when couples freeze embryos. When eggs are warmed after vitrification, fertilization rates with conventional IVF are lo...

Scientists journey to southern Africa to unravel the secret world of elephant communication

...eason, the four males step away from the water and freeze in unison, as if posing for a group action shot. O...ss down on his legs, go forward a little bit, then freeze again. It was just so fascinating to me, and it's what got me to think maybe there's something else ...

New method shows it is possible to grow bone for grafts within a patient's body

...le to grown replacement bone at an early stage and freeze it so it can be used when it is needed, says Prasad. Despite the fact that living bone is continually growing and reshaping, the numerous attempts to coax it to grow bone outside of the body--in vitro--have all failed. Recent attempts to stimulate b...

Study casts doubt on 'Snowball Earth' theory

... agree that prehistoric Earth was locked in a deep freeze during Precambrian times, about 750 to 600 million years ago. They disagree over the severity of the glaciation. "Snowball Earth" proponents, who say that Earth's oceans were covered by thick ice, explain the survival of life by hypothesizing the ex...

For first time, brain cells generated in a dish

...f Medicine. "We can basically take these cells and freeze them until we need them. Then we thaw them, begin a cell-generating process, and produce a ton of new neurons." If the discovery can translate to human applications, it will enhance efforts aimed at finding ways to use large numbers of a person's ow...

Study identifies gene in mice that may control risk-taking behavior in humans

...al mice did, researchers found. These mice did not freeze their movements as often in anticipation of the mild shock. To assess the level of unconditioned fear in mice with a single copy of the neuroD2 gene, researchers put them into a situation that would elicit a fear response in normal mice. They used ...

When in danger humans are similar to a deer in the headlights

...inds that humans, like many other complex animals, freeze when encountering a threat. The mere picture of an injured or mutilated human induces this reaction. When viewing these unpleasant images, the study's participants froze as their heart rate decelerated and amount of their body sway reduced. The autho...

Lands surface change on Alaska tundra creating longer, warmer summers in Arctic

...lier than in previous decades. Likewise, the first freeze each year is arriving slightly later, allowing plants to extend their growing season. The longer growing season is allowing shrubs and trees to slowly migrate northward. The increasing woody vegetation is further warming the near-surface atmosphere b...

Israeli scientists successfully transplant frozen-thawed ovaries in sheep

...he next objective was to see if they could remove, freeze and thaw the right ovary from eight sheep, including the vascular pedicles (the attachment that contains the main blood vessels), and replace the ovary up to a fortnight later, either at the original site or by grafting it on to the pedicle of the (r...

North & South American researchers find architectural abnormalities in T. cruzi ribosome

...lar to a medical CAT scan. First, the researchers freeze an ultrathin layer of buffer with purified ribosomes so quickly that the water has no chance to crystallize and damage the ribosomes. Then, the frozen sample is imaged with an electron beam in the transmission electron microscope. A CAT scan takes r...

Thin tough skin, slow-growing gills protect larval Antarctic fish

...g point at -1.91 degrees Celsius, fish fluids will freeze at about -1 degree Celsius. The water where these ...aid. "At -2 degrees Celsius, internal fluids would freeze instantly and the baby fish would die." "This 0.7 of a degree Celsius is small but very significant...

US woman gives birth to baby from world's first frozen donor egg bank

...Phoenix, Arizona. The technology to successfully freeze and thaw donor sperm for infertile couples has bee...r decades. However, the technology to successfully freeze women's eggs did not exist until recently, prompting Cryo Eggs International (CEI) to open its doors...

Secrets of the sea yield stronger artificial bone

...We allow nature to guide the process. Seawater can freeze like a layered material, so why not use this property to cast ceramics that mimic nacre," says Antoni Tomsia of Berkeley Lab's Materials Sciences Division, who developed the composite with fellow Materials Sciences Division researchers Sylvain Devill...

Discovery may speed forest biotechnology

...ing and go dormant in the winter or they literally freeze to death. "From an evolutionary perspective, it's easy to understand why forest trees don't flower and produce seed and pollen earlier," Strauss said. "When they are young, the trees that survive need to focus their energy on growth and height in or...

Chromosomal abnormalities in sperm higher after vasectomy reversal

...d until we know more it would probably be safer to freeze ejaculated sperm before vasectomy. We need a lot more evidence and research on this issue before we can be certain of avoiding the dangers." ...

New egg freezing technique offers hope to hundreds of women

...yos. "For decades men have had the opportunity to freeze sperm prior to treatment for malignant diseases, a.... With the current techniques, women would need to freeze hundreds of oocytes in order to have a reasonable chance of obtaining a child, but by using the tech...

Researchers discover which organs in Antarctic fish produce antifreeze

...reezing point at ?.91 degrees Celsius, fish fluids freeze at about ? degree Celsius. These species dwell in water that rarely rises above the freezing point and is regularly filled with ice crystals. From the intestine, the AFGPs are, apparently, absorbed into the blood. This hypothesis is based on the nea...

New technology addresses female fertility preservation

...ility, such as those needing cancer treatment, can freeze mature, fertilized eggs, but the process can take up to six weeks and for some this delay of treatment is not an option. Immature follicles (the female egg and surrounding somatic cells) can be preserved at any time but are difficult to mature when ...

Researchers report technique for freezing and preserving genetically enhanced pig embryos

...a surrogate. Swine embryos have been difficult to freeze and preserve because of their sensitivity to cold ...s expected that it would be even more difficult to freeze and preserve swine embryos that had been produced by in vitro methods. Dr. Prather's team overcame ...

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