Sunday, March 25, 2007
gold
Gold is a very rare substance making up only five ten-millionths of the Earth's outer layer. Gold is the most malleable( A malleable metal can easily be deformed, especially by rolling, without cracking)and ductile metal.Gold is a good conductor of heat and electricity and it is highly unreactive, and is not affected by air and most reagents. Heat, moisture, oxygen, and most corrosive agents have nearly no chemical effect on gold, making it well-suited for use in coins and jewelry.
diamonds
diamond is the hardest known natural material around. There are many brillant properties of diamond that make it treasured by mankind. The hardness of diamond make it suitable as a form of gemstone. diamond can only be scratch by other diamonds hence it can maintain its polish extremely well. Diamond is therefore prefer by the majority to be the gem for wedding and engagement rings. diamond are also the ideal material for cutting and grinding tools. diamonds can also be used as semiconductors(is a solid whose electrical conductivity can be controlled over a wide range, either permanently or dynamically).Diamonds can occur in nearly any colour. Colored diamonds contain impurities or structural defects that cause the coloration, while pure or nearly pure diamonds are transparent and colourless.
Saturday, March 24, 2007
not program to age!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Free radicals have also been implicated in certain cell signalling processes. however is it also the main cause of ageing. Free radicals are so reactive that sometimes it take parts in unnessary unwanted reactions that could cause cell damage. Free radicals sometimes react wit DNA which can result in undesirable mutation which can eventually cause many forms of cancer.Some of the symptoms of aging such as atherosclerosis are also attributed to free-radical induced oxidation of many of the chemicals making up the body. In addition free radicals contribute to alcohol-induced liver damage, perhaps more than alcohol itself. Radicals in cigarette smoke have been implicated in inactivation of alpha 1-antitrypsin in the lung. This process promotes the development of emphysema. However free radicals are still necessary for body functioning hence our body still have certain ways to minimise free radicals inducing damage such as the enzymes superoxide dismutase, catalase, glutathione peroxidase and glutathione reductase.In addition antioxidants also play extremely important roles in neutralising the effects of free radicals.vitamin c , a and e are some good antioxidants hence i strongly recommoend that people should eat more fruits.
Mitochondria convert energy for the cell into a usable form, adenosine triphosphate (ATP). however, sometimes, the oxygen is reduced to give the superoxide radical. Superoxide needs an additional electron to make it more stable, so it steals an electron from the nearest source, such as: mitochondrial DNA, the mitochondrial membrane (called lipid peroxidation), or from protein, or from reductants such as Vitamins C or E, or, from non enzymatic antioxidants such as glutathione or thioredoxin. If too much damage is caused to the mitochondrion, it experiences cell death.
Mitochondria convert energy for the cell into a usable form, adenosine triphosphate (ATP). however, sometimes, the oxygen is reduced to give the superoxide radical. Superoxide needs an additional electron to make it more stable, so it steals an electron from the nearest source, such as: mitochondrial DNA, the mitochondrial membrane (called lipid peroxidation), or from protein, or from reductants such as Vitamins C or E, or, from non enzymatic antioxidants such as glutathione or thioredoxin. If too much damage is caused to the mitochondrion, it experiences cell death.
Sunday, March 18, 2007
vitamin we all need it!!!!!!!!!!!!!!!!!!!
Vitamin A helps form and maintain healthy teeth, skeletal and soft tissue, mucous membranes, and skin. It is also known as retinol because it produces the pigments in the retina of the eye.
Vitamin A promotes good vision, especially in low light. It may also be need for reproduction and breast feeding.
Retinol is an active type of vitamin A. It is found in animal liver, whole milk, and some fortified foods.
Carotenoids are dark colored dyes found in plant foods that can turn into a form of vitamin A. One such carotenoid is beta-carotene. Beta-carotene is an antioxidant. Antioxidants protect cells from damage caused by unstable substances called free radicals. Free radicals are believed to contribute to certain chronic diseases and play a role in the degenerative processes seen in aging.
eggs, meat, milk, cheese, cream, liver, kidney, cod, and halibut fish oil contain lots of vitamin A.
however too much vitamin A can cause serious health problems such as birth defects.
Vitamin C is also a highly effective antioxidant. Even in small amounts vitamin C can protect molecules in the body, such as proteins, fats, carbohydrates, and nucleic acids from damage by free radicals.Vitamin C is required for the formation of collagen, a component required in blood vessels, tendons, ligaments, and bone. Vitamin C are required in the synthesis of the neurotransmitter. Neurotransmitters are required in brain function . lack of Vitamin C can cause scurvy. Symptoms of scurvy include bleeding and bruising easily, hair and tooth loss, joint pain and swelling.
some source of vitamin C include orange, tomato, broccoli, potato, grapefruit.
Vitamin D aids in the absorption of calcium, helping to form and maintain strong bones.
fatty fish and fish oil are some source of vitamin d. Exposure to sunlight is an important source of vitamin D. Ultraviolet (UV) rays from sunlight trigger vitamin D synthesis in the skin.
Vitamin A promotes good vision, especially in low light. It may also be need for reproduction and breast feeding.
Retinol is an active type of vitamin A. It is found in animal liver, whole milk, and some fortified foods.
Carotenoids are dark colored dyes found in plant foods that can turn into a form of vitamin A. One such carotenoid is beta-carotene. Beta-carotene is an antioxidant. Antioxidants protect cells from damage caused by unstable substances called free radicals. Free radicals are believed to contribute to certain chronic diseases and play a role in the degenerative processes seen in aging.
eggs, meat, milk, cheese, cream, liver, kidney, cod, and halibut fish oil contain lots of vitamin A.
however too much vitamin A can cause serious health problems such as birth defects.
Vitamin C is also a highly effective antioxidant. Even in small amounts vitamin C can protect molecules in the body, such as proteins, fats, carbohydrates, and nucleic acids from damage by free radicals.Vitamin C is required for the formation of collagen, a component required in blood vessels, tendons, ligaments, and bone. Vitamin C are required in the synthesis of the neurotransmitter. Neurotransmitters are required in brain function . lack of Vitamin C can cause scurvy. Symptoms of scurvy include bleeding and bruising easily, hair and tooth loss, joint pain and swelling.
some source of vitamin C include orange, tomato, broccoli, potato, grapefruit.
Vitamin D aids in the absorption of calcium, helping to form and maintain strong bones.
fatty fish and fish oil are some source of vitamin d. Exposure to sunlight is an important source of vitamin D. Ultraviolet (UV) rays from sunlight trigger vitamin D synthesis in the skin.
Saturday, March 17, 2007
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