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Tag: "embryos" at biology news

Clam embryo study shows pollutant mixture adversely affects nerve cell development

...sch and her colleaguestreated developing surf clam embryos (Spisula solidissima) withdifferent combinations o... induce the greatest adverse response.Treating the embryos with the triple mixture resulted in increasedproduction of a subunit of an enzyme called protein kin...

Study identifies predictors of HIV drug resistance in patients beginning triple therapy

...sch and her colleaguestreated developing surf clam embryos (Spisula solidissima) withdifferent combinations o... induce the greatest adverse response.Treating the embryos with the triple mixture resulted in increasedproduction of a subunit of an enzyme called protein kin...

UCSD researchers maintain stem cells without contaminated animal feeder layers

...te. Currently, stem cell lines derived from human embryos are grown and nourished in petri dish material called feeder layers that are made with animal connective tissue, primarily mouse and calf. A recent study in Nature Medicine** by UCSD's Ajit Varki, M.D. showed that human embryonic stem cells grown in ...

Zebrafish may hold key to understanding human nerve cell development

...the consequences of gene defects in the 200 to 300 embryos each femalefish produces," she said.By studying these mutant embryos, Piotrowski and her colleaguesdiscovered that during development the zebrafish is "seeded" withfuture hair cells through a process known as placode migration. Theseprecursor cells, ...

Harmful Bacterium Commonly Found in Poultry May Survive Refrigeration and Frozen Storage Combined

...the consequences of gene defects in the 200 to 300 embryos each femalefish produces," she said.By studying these mutant embryos, Piotrowski and her colleaguesdiscovered that during development the zebrafish is "seeded" withfuture hair cells through a process known as placode migration. Theseprecursor cells, ...

GenMAPP 2.0 released

...the consequences of gene defects in the 200 to 300 embryos each femalefish produces," she said.By studying these mutant embryos, Piotrowski and her colleaguesdiscovered that during development the zebrafish is "seeded" withfuture hair cells through a process known as placode migration. Theseprecursor cells, ...

Influenza vaccine uses insect cells to speed development

...y that an avian influenza virus would be lethal to embryos in the eggs. The vaccine strategy pursued by Protein Sciences, known commercially as FluBlok, does not rely on whole vaccine virus. It uses a purified concentration of a key molecule on the surface of the virus, called hemagglutinin, to elicit an im...

Stem Cell Research Shows Potential for Replacing Tissue Damaged in Heart Attacks

... the embryo itself. In research conducted on chick embryos since 1992, his team discovered that a group of very young embryonic cells called “precardiac endoderm?sends strong signals that cause adjacent cells in the embryo to become cardiac myocytes. Based on this finding, Dr. Lough reasoned that precardiac ...

Multi-purpose protein regulates new protein synthesis and immune cell development

...e if IRE1 was involved, also. Zhang studied mouse embryos that were missing the gene for IRE1. He found that...anted hematopoietic stem cells from IRE1 knock-out embryos into mice whose bone marrow had been destroyed by radiation. He found that stem cells deficient in I...

Researchers find new genes necessary to make embryo

...letely sequenced and a model organism to study how embryos develop. Using RNA interference (RNAi), a method for identifying the function of genes, the researchers almost double previous estimates of how many genes are required to make an embryo. Their study focused on the genes expressed by the mother and im...

Buying Time Through Hibernation on Demand

...model organisms as yeast and worms, as well as the embryos of fruit flies and zebrafish. In each case they achieved metabolic suspension through oxygen deprivation caused by exposure to gases such as hydrogen sulfide and carbon monoxide. Known as oxygen mimetics, these chemicals are very similar to oxygen a...

U-M team recovers ancient whale in Egyptian desert

...model organisms as yeast and worms, as well as the embryos of fruit flies and zebrafish. In each case they achieved metabolic suspension through oxygen deprivation caused by exposure to gases such as hydrogen sulfide and carbon monoxide. Known as oxygen mimetics, these chemicals are very similar to oxygen a...

First frozen egg baby born in Canada

...oplasmic sperm injection (ICSI), and the resulting embryos implanted in her uterus. "The patient went through an uncomplicated full-term pregnancy and straightforward delivery," says Dr. William Buckett, the MUHC physician who looked after the mother during the pregnancy. The parents, who requested anonymit...

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

...ertility options, and the clinic currently freezes embryos for cancer patients who have a partner. The clinic also offers counseling and sperm freezing for male cancer patients. U-M will offer egg vitrification only to women facing cancer treatments, because the long-term safety of this technique remains unk...

Double triumph in stem cell quest

...e much cheaper and easier. What's more, because no embryos are destroyed, it would bypass many ethical issues...ow Hwang has created 11 more ESC lines from cloned embryos in an impressive study that answers all the criticisms of his original study. He has also greatly in...

Scientists discover that three overlapping signals in embryo help get the backbone right

...teins in early development. Now, using very young embryos of the laboratory frog Xenopus tropicalis, Khokha,...o try blocking more than one, and chose to work in embryos of the frog Xenopus tropicalis, a close relative of the more common laboratory frog Xenopus laevis. ...

Master gene controls healing of skin in fruit flies and mammals

...op properly. Confirming her suspicions, the mutant embryos turned out to be much more permeable to a dye than normal embryos. The group also showed that the genes active in the mutant flies' lesions were activated in normal flies in cells surrounding a wound created with a sterile needle. The researchers th...

Stem cell research - new cell lines

...government's moratorium limiting the use of excess embryos ends. ...

Making Sure Sacred Sheep Don't Become Extinct

...of samples of animal germplasm -- mainly semen and embryos -- to make sure there's enough genetic material to reintroduce a species if necessary. Much of his collection deals with important livestock such as Holstein cattle and Yorkshire pigs. But one of the collections Blackburn, who is the coordinator of ...

Discovery could be key to bioterrorism defense

... system development and blood vessel growth in the embryos of humans and other mammals. Broder and his team are among only a handful of scientists focusing on the viruses, which have been under investigation by USU researchers since 2000. Broder is a principal investigator on one of six projects from the Mi...

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