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Tag: "stage" at biology news

First production of human monoclonal antibodies in chicken eggs published in Nature Biotechnology

...s were then introduced into chick embryos. At this stage of development, the embryonic stem cells can make significant contributions to the developing chicken. Resulting chimeras with large contributions from the stem cells lay eggs containing milligram amounts of antibody, which is then separated from the...

Scientists succeed in cloning human embryos from eggs matured in the lab

... eggs (oocytes) that have reached the metaphase II stage (MII) at which ovulation and fertilisation occurs ...ation of male and female pronuclei is an important stage just before the maternal and paternal chromosomes start to pair up in preparation for the first cell...

Invitrogen Launches i-Path -- A Unique Systems Biology Platform at BIO 2005

... eggs (oocytes) that have reached the metaphase II stage (MII) at which ovulation and fertilisation occurs ...ation of male and female pronuclei is an important stage just before the maternal and paternal chromosomes start to pair up in preparation for the first cell...

Environmental chemical cocktail may sabotage sperm

... the effect the chemicals had on capacitation, the stage when a sperm acquires the ability to fertilise an egg. "We found that combinations of small quantities of these three xenobiotics stimulated sperm far more than when used individually," she said. In particular, the chemicals stimulated the sperm to ...

Major advance made on DNA structure

... genetic sequences, researchers say, helps set the stage for applied advances in biology, biomedicine, genetic engineering, nanotechnology and other fields. The recent work was supported by grants from the National Institutes of Health and the National Science Foundation. ...

Anthrax inhibitors identified by Burnham team

...pically fatal unless diagnosis is made at an early stage of infection, when antibiotics such as Ciprofloxacin can provide a complete cure. At late stages in the disease, antibiotics can kill the anthrax bacteria, but do not affect LF secreted by the bacteria, which is sufficiently concentrated in the blood...

Unexpected lock and key mechanism found for the assembly of tumor blood vessels

...cell types receive survival signals at this active stage of blood vessel development, which occurs mainly in tumors in adults," said Varner. "This was a chance discovery, which was exciting, and we think it may have important clinical significance." In their current studies of breast cancer patients for t...

Human embryonic stem cells have the potential to develop into eggs and sperm in the laboratory

...ls) might interfere with human development at this stage and cause congenital abnormalities, infertility and possibly cancer (in particular testicular cancer). By developing suitable tests with embryonic stem cells as they differentiate to germ cells we can investigate the action of these chemicals in the ...

Going To Extremes To Improve Human Health

...s a special focus on sleep apnea which can set the stage for high blood pressure. Halliwill, who also studies factors responsible for changes in blood flow to various regions of the body, co-directs the university's Exercise and Environmental Physiology Laboratories with Chris Minson, an associate profess...

Gifts from the sea

...scientists can study millions of cells in the same stage of division. Clam eggs are also transparent, providing a perfect window on biology in action. MBL scientists studying surf clams have made discoveries that may be critical to understanding diseases such as cancer; progeria, a disease that causes chil...

Compound might defeat African sleeping sickness, clinical trial beginning this month

...irment of the brain and nervous system in its late stage and, if not treated, death. The World Health Organ... and high effectiveness in subjects with the early stage of sleeping sickness. Scientists are launching a Phase III trial this summer involving for the first...

Why are coyotes getting more aggressive?

...is kind of aggressive behavior is usually the last stage before coyotes actually start attacking humans -- such as small children that are perceived by the coyotes as a potential food source," says Paul Curtis, associate professor of natural resources at Cornell University. He notes that in the past two de...

University of Nevada, Reno research team discovers hormone that causes malaria mosquito to urinate

... solution to the problem of killing insects at any stage of development may be found in peptide hormones, small proteins in all animals that regulate most bodily functions. While researching the genome of the malaria mosquito, Schooley discovered two different types of diuretic hormones similar to those fr...

Most common lung cancers may begin in newly discovered cells

... lung. Their experiments show that at the earliest stage of tumor development, the stem cell appears to be ...ent. In contrast, lung cancer detected at an early stage boasts a 50 percent survival rate over a five-year period. "There are many similarities between ste...

Micro-molecule plays big role in birth defects

...s could eliminate Dicer in specific tissues at any stage in the developmental process, thus opening a window into the role of microRNAs in limb development. In cases where Dicer is not present in developing limb tissue, Harfe showed that microRNAs were not processed and limbs were visibly smaller. "Many ...

Researchers devise new technique for creating human stem cells

... he said. Melton emphasized that "at this at this stage in our understanding, the hard fact is that the only way to create an embryonic stem cell from a somatic cell is by nuclear transfer into oocytes. Taking advantage of this current capability -- such as colleagues in South Korea and other countries ar...

Mass production of human papillomavirus could lead to gains against cervical cancer

... trigger the immune system to attack at an earlier stage in the virus's life cycle to stop HPV before it ca...g HPV in the laboratory has been that in the early stage of its infective cycle, the virus lurks in undifferentiated basal epithelial (skin) cells, said Ahlq...

MicroRNA tweaks protein that controls early heart development

... to be shut off so the cells can go on to the next stage in their development and differentiate into heart muscle cells. We identified Hand2 as the target for this particular microRNA." Dr. Srivastava is a former professor of pediatrics and molecular biology at UT Southwestern, where he and his colleagues...

Engineered skin offers clues to melanoma development

...es that did not receive hTERT remained in an early stage of benign growth. Finally, the team looked at the PI3K and Raf pathways, frequently implicated in the development of melanoma. They found the expression of active PI3K, together with CDK4, hTERT, and inhibition of p53, produced invasive melanoma gro...

Ibruprofen and other commonly used painkillers for treating inflammation may increase the risk of heart attack

...es that did not receive hTERT remained in an early stage of benign growth. Finally, the team looked at the PI3K and Raf pathways, frequently implicated in the development of melanoma. They found the expression of active PI3K, together with CDK4, hTERT, and inhibition of p53, produced invasive melanoma gro...

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