2,449 results
2,449 results for: mutations
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19870
This article reviews efforts to explain why certain biological molecules tend to be all right-handed (e.g., sugars) or left-handed (e.g., amino acids). An explanation might lie in the evolution of enzymes involved in their synthesis. For example, the fact that some organisms produce predominantly d-alanine could be explained by random mutations for the opposite enzyme […]
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Fatherless Stem Cells: Scientific fraud involved an accidental advance
Stem cells that discredited researcher Woo Suk Hwang claimed as the first example of human cloning actually came from embryos that contained only the mother's genetic material.
- Health & Medicine
Hepatitis B drug creates HIV resistance
A hepatitis B drug spurs resistance to HIV drugs in people infected with both diseases.
- Earth
The Hunt for Habitable Planets
Here and now, a new suite of small telescopes are poised to look for Earthlike planets beyond the solar system.
- Health & Medicine
Mother Knows All
Fragments of a fetus' genetic material that leak into a pregnant woman's bloodstream reveal details of early fetal development.
- Neuroscience
It’s written all over your face
To potential mates, your mug may reveal more than you think.
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Bacteria thrive by freeloading
Mutant bacteria thrive by freeloading off their hard-working kin, but these slackers revert to working normally if they become too numerous.
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One tall gene
The first reported gene for height can account for almost a centimeter of difference among people who have different versions of it.
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Emotional memory
The action of a stress hormone could be why emotionally charged events form especially vivid and durable memories.
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New World Stopover: People may have entered the Americas in stages
People first reached the edge of the Americas about 40,000 years ago but had to stay put for at least 20,000 years before melting ice sheets allowed them to move south and settle the rest of the continent.
- Health & Medicine
Taking Cancer’s Fingerprint: Rapid genetic profiling for personalized therapy
A new, faster way to identify cancer-causing mutations in the DNA of tumor cells may pave the way for the next generation of custom-tailored cancer therapies.
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No gene is an island
Even as biologists catalog the discrete parts of life forms, an emerging picture reveals that life’s functions arise from interconnectedness.
