Monday, September 29, 2008

Fruits and Vegetables Can Protect Your Health

Fruits and vegetables contain essential vitamins, minerals, and fiber that may help protect you from chronic diseases. Compared with people who consume a diet with only small amounts of fruits and vegetables, those who eat more generous amounts as part of a healthful diet are likely to have reduced risk of chronic diseases, including stroke and perhaps other cardiovascular diseases, and certain cancers.

Wednesday, September 24, 2008

The Goldfish

The common goldfish is remarkably hardy, and it is the most commonly kept pet animal in the world. It ahs been kept as an ornamental fish for centuries, and graced the garden pools & aquariums of kings and emperors for a thousand years.

The goldfish is renowned for its spectacular red-gold colour, can grow to about 20cm in length, and live upto 10 years or more.

The body is protected by rows of overlapping scales that never increase in number, but increase in size as the fish grows. The circuli, or rings of growth, are well-spaced in summer when growth is rapid, but are laid down close together in winter and at other times of poor growth. The tightly-bunched circuli of winter tend to show up as distinct bands, or annuli, and it is these that indicate the years of a fish's life to a trained scale reader.

Monday, September 15, 2008

Chestnut

Chestnut trees are cultivated for their nuts or as ornamentals. Probably the most notable species was the large and graceful ornamental American chestnut (C. dentata (Marsh.) Borkh.) (fig. 73), which extended from Maine southwest to Arkansas (Munns 1938). It has been almost completely destroyed by blight. The Japanese chestnut (C. crenata Sieb. and Zucc.) and the Chinese chestnut (C. mollisima Blume) are both cultivated for their nuts. Chestnut is a deciduous tree or shrub, which is cultivated in a similar manner to other deciduous nut trees. It bears brown nuts, about an inch in diameter, which are usually consumed after they are roasted. From one to nine nuts are produced in a spiny involucre or burr.

Tuesday, September 09, 2008

Bird Conservation Thematic Node

The Bird Conservation Node facilitates rapid access to North American bird population and habitat data maintained by a broad coalition of Federal, state, and non-governmental partners in conservation. Includes life history, range, and habitats [Department of the Interior, U.S. Geological Survey (USGS), National Biological Information Infrastructure]

Monday, September 01, 2008

Solar Spectrum

The total distribution of electromagnetic radiation emanating from the sun. The different regions of the solar spectrum are described by their wavelength range. The visible region extends from about 390 to 780 nanometers (a nanometer is one billionth of one meter). About 99 percent of solar radiation is contained in a wavelength region from 300 nm (ultraviolet) to 3,000 nm (near-infrared). The combined radiation in the wavelength region from 280 nm to 4,000 nm is called the broadband, or total, solar radiation.