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Tag: "eggs" at biology news

Researchers solve mystery of how nuclear pores duplicate before cell division

...archers created a cell-free system based on frog's eggs (oocytes) that was able to recapitulate the insertion of the nuclear pore complex into the nuclear membrane. Using advanced real-time imaging tools the scientists watched as a nuclear membrane ?pores and all ?formed within an hour. "We were able to...

Protecting endangered species helps reduce poverty

...rth more to the local economy than turtle meat and eggs ever were. The community strongly supports conservation measures to promote ecotourism, and both turtle and tourist numbers have climbed over the past 30 years. Community forestry efforts in parts of Nepal have led to the restoration of vital habit...

CU, USDA team to curb two invasive, poisonous vines

...nge of monarch butterflies. The monarchs lay their eggs on milkweed, and their larvae eat it as a primary ...tudies have shown that when the monarchs lay their eggs on pale or black swallow-wort, the larvae die within three days. DiTommaso and his graduate student...

A surprising pair of proteins help make healthy eggs

Human eggs rely on handmaidens. Called granulosa cells, they surround eggs and deliver nutrients and hormones. Without granulosa cells, eggs cannot mature and be successfully ...

There's something fishy about human brain evolution

...hink it was early humans eating clams, frogs, bird eggs and fish from shoreline environments. This is what created the necessary physiological conditions for explosive brain growth," says Dr. Cunnane, a metabolic physiologist at the University of Sherbrooke in Sherbrooke, Quebec. The evolutionary growth ...

Horseshoe crab decline threatens shorebird species

...over in the Delaware Bay to feed on horseshoe crab eggs resulting from the largest spawning of horseshoe c...s, the report notes. "The number of horseshoe crab eggs was the most important factor determining the use of the beaches by red knots. The availability of h...

Mute swan population helps explain longstanding evolutionary question

...nding evolutionary question: whether the number of eggs laid by a female bird ?known as "clutch size" ?cha...d for--but not seen-- an increase in the number of eggs laid. However, this 25-year study of the selection, inheritance, and evolution in the mute swan popu...

Ocean 'dead zones' trigger sex changes in fish, posing extinction threat

... also might reduce the quantity and quality of the eggs produced by female fish, diminishing their fertility, he adds. In their experiments, Wu and his colleagues found low levels of dissolved oxygen ?less than 2 parts per million ?down-regulated the activity of certain genes that control the production...

Clawed frog helps Fanconi anemia research make leaps

...ology are the first to report a new approach using eggs of the African clawed frog, which goes by the Lati...Maureen Hoatlin, Ph.D. Using extracts from Xenopus eggs and chemically triggering DNA copying, the team showed that the Fanconi proteins function to prevent...

Removing egg from nest may help save endangered whooping crane

...od Buffalo National Park one of two whooping crane eggs laid and raising it in a "foster-parenting" progra...hanced by the egg removal program but removing the eggs has allowed the establishment of additional populations like those in Wisconsin and Florida, and a s...

Getting an evolutionary handle on life after reproduction

...ce based on evidence that they continue to produce eggs as adults. It's an open question whether postreproductive lifespan can influence fitness enough to be under selection. But in a field dominated by investigations into the origins of human menopause and extended lifespan, the authors make a strong cas...

UF study first to quantify validity of DNA I.D. tool using marine snails

...ne." And because the technology also can identify eggs or other different life stages it could be used to..., Meyer said. "A border guard may come across some eggs or larvae in an orange shipment and wonder if they are from a dangerous fruit fly or something else ...

Scientists unpick genetics of first 15 minutes of life

...ene in the maternal (mother's) genome explains why eggs fail to produce a zygote - or early embryo - despite the presence of 'healthy' sperm. Although the researchers use the fruit fly Drosophila melanogaster to discover the basic genetic processes of sex, the same genetic processes are present in all se...

Biologist Discovers What May Be World’s ‘Pickiest?Mates

...o accommodate them and successfully incubate their eggs and release their larvae. “Larvae were successfully released during high-amplitude nocturnal tides only when females incubated in burrows that allowed the larvae to exit the estuary swiftly and thus reduce predation risk, but not when females incuba...

Emerald Spectre haunts Ontario's ash forests

...eading with a little human help. Adult beetles lay eggs under tree bark and the feeding larvae kill trees by disrupting the flow of nutrients in the soft tissues under the bark. The new study funded by the Natural Sciences and Engineering Research Council of Canada (NSERC) reveals that unprecedented acti...

Costly breeding programs for endangered species pay off

... the fitness of the pair by counting the number of eggs the female laid, and by measuring the number of eggs that hatched. In the MAI breeding scheme, brothers and sisters were never allowed to mate and were ...

UW scientists report a new method to speed bird flu vaccine production

... its virulent nature - can be seeded into chicken eggs to generate the vaccine used in inoculations, which prepare the human immune system to recognize and defeat the wild viruses that spread among humans in an epidemic or pandemic. In their report, a team led by UW-Madison virologists Yoshihiro Kawaoka...

Techniques available to detect soil that inhibits destructive soybean pest

...at point her body is a case to protect hundreds of eggs while they mature, hatch into juveniles and leave the cyst to further attack the plant roots. Swollen females can be seen with the naked eye, but worm-like juveniles and males can best be seen with a microscope. As nematodes steal nutrients from the...

The ecological effects of the Chernobyl disaster

...Chernobyl-nesting birds. Survival rates, number of eggs laid, and overall body condition was lower, despite similar nesting and laying dates. The radio nucleotides in the area also filter into the soil, and from there into plants. Animals that consume these plants, including livestock, then take up the r...

DDT-resistant insects have additional genetic advantage that helps resistance spread

... look at single character traits such as number of eggs laid, and often compare resistant and susceptible lines that are genetically unrelated. "Differences in fitness therefore often correspond to differences in genetic background rather and are not due to the resistance gene itself." Using DDT-resista...

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