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tag hearing loss evolution microbiology

Chromosome 21 Reveals Sparse Gene Content
Ricki Lewis | Jun 11, 2000 | 8 min read
The unveiling of the DNA sequences of human chromosomes represents a new chapter in the unfolding story of genomics, but one with roots in the half-century-old field of cytogenetics. Chromosome-level looks can reveal the specific genes behind certain traits and disorders while providing information on genome organization. The diminutive chromosome 21--the smallest of the human contingent, despite its number as next to last--is the fourth to be described. Its debut in mid-May attracted attentio
Genome Economy
Ricki Lewis | Jun 10, 2001 | 10 min read
The Human Genome Project's discovery1 that the human body runs on an instruction manual of a mere 35,000 or so genes--compared to the worm's 19,000, the fruit fly's 13,000, and the tiny mustard relative Arabidopsis thaliana's 25,000--placed humanity on an even playing field with these other, supposedly simpler, organisms. It was a humbling experience, but humility quickly gave way to awe with the realization that the human genome might encode 100,000 to 200,000 proteins. Scientists base this num
Epigenetics: Genome, Meet Your Environment
Leslie Pray | Jul 4, 2004 | 10+ min read
©Mehau Kulyk/Photo Researchers, IncToward the end of World War II, a German-imposed food embargo in western Holland – a densely populated area already suffering from scarce food supplies, ruined agricultural lands, and the onset of an unusually harsh winter – led to the death by starvation of some 30,000 people. Detailed birth records collected during that so-called Dutch Hunger Winter have provided scientists with useful data for analyzing the long-term health effects of prenat
Soil Scientists And Volunteers Dig In To Save The Earth
Robin Eisner | Jan 19, 1992 | 8 min read
In Blaenavon, South Wales, on a warm September morning last year, a psychotherapist from Colorado and a computer repairman from northeastern England, both on vacation, sat on a grassy hill slope and measured how water flowed through the layer of topsoil covering the hill. Their readings will help determine the quality of this land, which is currently used for sheep grazing. The next day, on a nearby tract of land, a California elementary school teacher and a New Hampshire accountant, both als

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