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Tag: "eggs" at biology news

Cigarette smoke alters DNA in sperm, genetic damage could pass to offspring

...moke on male mice as well the possibility that the eggs of females are affected by smoke....

Studies to find better ways to preserve human eggs, ovarian tissue under way

...east in blood vessels. “Now we want to try this on eggs and ovarian tissue and see if we can develop a rob...ing methods to stimulate ovarian tissue to produce eggs outside the body, a process that could also make in vitro fertilization a lot more affordable. Other...

Study shows lizard moms dress their children for success

...ve an extra dose of the hormone estradiol to their eggs in certain social circumstances. The extra hormone... Lancaster began by treating side-blotched lizard eggs with an array of different hormones. That revealed a striking influence of estradiol on back pattern...

Amphibians in losing race with environmental change

...permeable skin, live on both land and water, their eggs have no shells. In the face of these challenges.... Examples include: Many amphibians lay their eggs in shallow, open water in direct sunlight to provide a more oxygenated environment, increase growth ...

Parasites' impact goes beyond host to affect ecosystem

...g infected fish, then in their feces excreting the eggs of C. lingua, which are in turn eaten by the snails. "The parasite’s life cycle is a really amazing strategy for an organism that doesn’t have a brain," says Byers, who predicts that anywhere gulls are prevalent, the C. lingua trematode would also...

Asexual worm quickly adapts to soil contamination

...ms from contaminated soil live longer and lay more eggs under polluted conditions than the worms from unpo...n the contaminated culturing medium they laid more eggs and lived for longer than the nematodes from the clean soil. Asexual The rapid adaptation to...

Scientists seek useful traits in wild cottons

...y inflict on cotton fruit and their ability to lay eggs for another generation are good indicators of Lygus resistance, said Sheehan, who hopes to intensify her experiment in 2007. Raina King, a Texas Tech University graduate student, is working to develop 'cleaner' cottons that shed the small le...

Hives ferment a yeasty brew, attract beetle pest

...umlinson. "If they can stop the beetles and remove eggs in the hive, the hive recovers." Honeybees are of major economic importance in agriculture as the major pollinating force for much orchard fruit and vegetables. Many of these fruits and vegetables will not produce without honeybees. The small hive ...

Rare soft-shell turtle, nesting ground found in Cambodia

... a nesting ground for the species and brought back eggs that have since hatched. The hatchlings were released into the wild on May 8, together with another adult turtle and additional hatchlings captured by fishermen and handed over to the conservation team. Last observed by scientists in the wild in C...

Bypassing eggs, flu vaccine grown in insect cells shows promise

...nal of the American Medical Association. Removing eggs from the flu vaccine manufacturing process is one ...lu as well as a potential bird-flu pandemic. Using eggs to grow vaccine takes time; a flu vaccine that relies on a different technology is capable of being ...

Smithsonian scientists discover new marine species in eastern Pacific

...often overlooked because they are smaller than the eggs themselves. "All the tedious dissections and microscope preparations done on a rolling, vibrating ship have really paid off," Norenburg said. One of the unique features of the islands off the coast of Panama is that they host animals that normally ...

NIAID DNA vaccine for H5N1 avian influenza enters human trial

... developed by growing the influenza virus in hens' eggs and then administered as a weakened or killed form of the virus, DNA-based vaccines contain only portions of the influenza virus' genetic material. Once inside the body, the DNA instructs human cells to make proteins that act as a vaccine against the...

Researchers find gene mutation that causes infertility in male mice

...n are born with fewer egg cells and can run out of eggs prematurely -- resulting in early menopause (or "mousapause" as the researchers humorously refer to the condition). To get their results, the researchers randomly induced mutations in the mouse genome and then looked for infertility in the resultin...

Manipulating nature: Scientists query wildlife birth-control method

...ive process. The antibodies can act against sperm, eggs or reproductive hormones, which prevent either fertilization or the production of sperm and ova. Proponents of the technique, which was first tested nearly 20 years ago, regard it as more humane than the conventional methods of controlling wildli...

Wheat can fatally starve insect predators

...e wheat plant's development. The adult fly lays eggs on the plant leaves. After the eggs hatch, the resulting tiny, red larvae crawl down to the base of the wheat where they feed on the pla...

Post oak grasshoppers emerging

...d from early May to mid-June the females lay their eggs in the soil. A female typically lays five to six eggs at a time in a pod, and will produce two to four pods over her lifetime. In the spring, when post oa...

Biologists prove critical step in membrane fusion

...are experts in fertilization; they used sea urchin eggs to study membrane fusion. In urchin eggs, thousands of membrane-bound vesicles are attached to the plasma membrane. Within seconds after fertilization, the contents of these vesicles are rapidly released. Previous research has shown that special prot...

Penn researchers replace organ in adult mice using 'single-parent' stem cells

...bryonic stem cells - created from a single donor's eggs or two sperm - and, for the first time, successfully used them to repopulate a damaged organ with healthy cells in adult mice. Their findings demonstrate that single-parent stem cells can proliferate normally in an adult organ and could provide a l...

No sex for 40 million years? No problem

...These tiny asexual creatures multiply by producing eggs that are genetic clones of the mother ?there are no males. Fossil records and molecular data show that bdelloid rotifers have been around for over 40 million years without sexually reproducing, and yet this new study has shown that they have evolved ...

Long-lived deep-sea fishes imperiled by technology, overfishing

...nd oreos, an individual fish produces thousands of eggs ?most of which die through predation or starvation. "One of the things we need to know more about is how the fish larvae get transported," Heppell said. "We don't know whether fish from different seamounts are genetically distinct or whether larva...

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