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TODAY IN HISTORY

    DNA STRUCTURE DISCOVERED
    February 28, 1953 - Cambridge, MA, U.S.A.

    James Watson, from early on this Saturday, spent his time at the Cavendish Laboratory in Cambridge, shuffling cardboard cutout models of the molecules of the DNA bases: adenine (A), guanine (G), cytosine (C) and thymine(T). After a while, in a spark of ingenuity, he discovered their complementary pairing. He realized that A joined with T had a close resemblance to C joined with G, and that each pair could hold together with hydrogen bonds. Such pairs could also neatly fit like rungs meeting at right-angles between two anti-parallel helical sugar-phosphate backbones of DNA wound around a common axis. Such structure was consistent with the known X-ray diffraction pattern evidence. Each separated helix with its half of the pairs could form a template for reproducing the molecule. The secret of life!

    BALTIMORE & OHIO RAILROAD
    February 28, 1827 - Baltimore & Ohio USA

    The Baltimore & Ohio Railroad became the first U.S. railway chartered for the commercial transportation of freight and passengers. Investors hoped that a railroad would allow Baltimore, the second largest U.S. city at that time, to successfully compete with New York for western trade. New Yorkers were profiting from easy access to the Midwest via the Erie Canal.

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RANDOM QUOTES

  • The wealth of the nation
    by Earth Day, Gaylord Nelson

    "...The wealth of the nation is its air, water, soil, forests, minerals, rivers, lakes, oceans, scenic beauty, wildlife habitats and biodiversity that'as all there is. That'as the whole economy. That'as where all the economic activity and jobs come from. These biological systems are the sustaining wealth of the world...."
  • Rules for Happiness
    by Immanuel Kant

    "...Rules for Happiness: Something to do, Someone to love, Something to hope for...."

RANDOM FACTS

  • Harvard Medical School
    about Eyesight Myth and Fact

    Myth: Staring at a computer screen all day is harmful to the eyes. Fact: Spending the day staring at a screen can tire or strain your eyes, but it will not hurt them. Make sure lighting doesn't create a glare on your screen. When spending long periods at your keyboard, take a break now and then to rest your eyes to reduce fatigue. Also, don't forget to blink. Your eyes need to stay lubricated to feel comfortable. Drug Abuse
    about Facts about Drugs

    Facts about drugs can protect against drug abuse. Legal drugs, such as alcohol and tobacco, kill more people than illegal drugs. Tobacco (smoking cigarettes) kills more people than any other drug. Illegal drugs including heroin, cannabis, ecstasy and amphetamines can have unknown or dangerous ingredients. Mixing drugs, especially with alcohol, can be fatal.

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Website preview thumbnail for : Lighting Fixtures
Is it time to remodel or buy a new house? Do you need ceiling fixtures for your rooms? Will you need to have different light fixtures for each room? Also decide which of these bulbs best fits your needs.
Article Content :When you first buy a house, remodel, or redecorate your house, this will be a good time to change your lighting fixtures. When redoing a room, it may take a few fixtures to bring out the room to the way it should be. Each room has a purpose and your lighting should correspond with that purpose. You can really bring out a room with a light fixture that is bold and striking. Ceiling fixtures come in all types of designs and can drastically change the feeling of your room. Lamps can be added to add contrast the ceiling lighting. If you do a lot of reading then you will need a high intensity reading lamp. The best types of reading lamps are those that are full spectrum lamps. These are specialty lamps and produce white light similar to the sun. Unlike regular incandescent bulbs, they create white light by emitting light frequencies like the sun does. This type of white light is good for reading and easy on the eyes. When looking for a ceiling lamp fixture, look for functionality. If the fixture has too many design features, it can block the light and provide very little general lighting to your room. If you room is to have computers, then a ceiling lighting fixture with indirect lighting will be best to avoid computer monitor glare. If possible try to avoid using florescent lamps in your living area since they emit light in 60 cycles which fatigue your brain and body. The ceiling lighting is not only for the kitchen but for the other rooms like the bedroom, stairway, hallways, and recreation room. The type of bulb you can put into a lighting fixture is only limited to the type of bulbs that are available in the market. Each bulb has a function and a specific frequency and power output in watt. When using a halogen bulb, use a fixture that will enclose this lamp in case it explodes. Full spectrum light bulbs are also available and I favor these because they mimic natural light more than any other type of bulb. Saving energy light bulbs are nice in concept, but don?t away put out the light intensity that you need in the room. If you have multiple fixtures and you can put these energy saving bulbs. Then again depending on the room's purpose, this will determine the wattage of bulbs you use. When looking at ceiling fixtures, consider the efficiency of the fixture. Some fixtures are beautiful to look at, but absorb the light that should go to the room. Make sure that the lamp is easy to clean otherwise you will be wishing you had bought another type of lamp. Also look to install a rheostat to control the light. This manual light control will give your bulb long life and you can adjust the intensity of the bulb to give more or less light. Using these tips will help you setup your lighting fixture so that you don't have to replace it later. Just make sure that you use the fixtures that will complement the purpose of your room.
Author Title :Affordable Lamps
Author Desc :Affordable Lamps, has a large display of Contemporary lighting fixtures. You can find lamps for each room with different purposes. You will surely find affordable lighting fixture or chandeliers. We also have outdoor lighting for you outdoor projects. Loo

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  • Rudy SilvaOwner :
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  • November 30, 2014Date Added :
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