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The first sentence in this article is incorrect when it refers to “a woman’s placenta.” A woman doesn’t have a placenta, nor does any other mammalian mother. The placenta is an organ of the fetus. The mother’s tissue ends at the uterus lining. Bruce S. SibbettSan Bernardino, Calif.
- Health & Medicine
DNA vaccine immunizes fetal lambs
Canadian scientists have devised a way to vaccinate fetal lambs, which could spawn more research into in utero methods for preventing the spread of disease from mothers to their babies.
- Animals
Slavemaker Ants: Misunderstood Farmers?
A test of what once seemed too obvious to test—whether ant colonies suffer after being raided by slavemaker ants—suggests that some of the raiding insects have been getting unfair press.
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Colossal Colon Tour
The Colossal Colon is a 40-foot-long, 4-foot-high replica of a human colon. Visitors can crawl through the colon or look through the viewing windows to see healthy colon tissue, colon disease, polyps, and various stages of colon cancer. Under the auspices of the Cancer Research and Prevention Foundation, the giant model will be on display […]
- Tech
Digital Cells
Researchers are gearing up to create cells with computer programs hardwired into the DNA.
- Animals
Fishy Paternity Defense: Bluegill dads: Not mine? Why bother?
Bluegill sunfish have provided an unusually tidy test of the much-discussed prediction that animal dads' diligence in child care depends on how certain they are that the offspring really are their own.
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In your article, the possibility is mentioned that patients with Parkinson’s disease might have improved in the study because of the placebo effect rather than the administration of the protein glial-cell-line-derived neurotrophic factor. The article then says, “However, brain scans of these patients . . . showed that dopamine supplies in the putamen improved over […]
- Health & Medicine
Protein Pump: Experimental therapy fights Parkinson’s
Bathing surviving dopamine-making neurons with a natural protein that induces nerve-fiber growth reverses some of the symptoms in Parkinson's disease patients.
- Math
The Colors of an Equation’s Roots
Over the centuries, mathematicians have developed a variety of methods of solving equations. Using the capabilities of modern computers, they have explored in detail how these age-old recipes work–when the methods can be relied upon, when they fail, and when they behave strangely. A polynomiograph of a degree-36 polynomial. B. Kalantari “Cathedral” by B. Kalantari. […]
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Moving On: Now the human genome is really done
An international consortium of scientists announced that the deciphering of the human genetic code is now truly complete.
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Radiation Marks Chromosomes: Plutonium leaves genetic fingerprint
By examining specific types of long-lasting genetic rearrangements in blood cells, researchers have found a way to measure a person's past exposures to plutonium radiation.
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Neural Recall: Brain area may support fact and event memory
A brain structure called the hippocampus may crucially influence memory for both factual information and personally experienced events.
