The sun's ultraviolet rays can kill and inhibit bacteria on the surface of the skin, promoting dehydrocholesterol in skin converted into vitamin D, boosting the body's resistance to disease, promote human metabolism, has an important role in human growth and development.
Skin by UV irradiation, the basal layer of the epidermis melanin formed, the biochemical processes tyrosinase activity in cells, induced tyrosine oxidation polymerization melanin; directly promote increased melanocytes and accelerate the transfer to the epidermis, so that darkening the skin. UV can cause sunburn, inflammation. Caused the degeneration of collagen fibers in the skin, rough skin, cause small wrinkles. Under in human photosensitivity substance conditions, sometimes may induce photochemical toxicity, allergy. However, UV enables dehydrogenation cholesteryl into vitamin D, to promote the body metabolism, have sterilization, disinfection effect. Overall, the UV certain physiological effects on the human body; excessive sun can damage the skin, affecting skin appearance.
The length of time under the sun have a different reaction to the body, suitable exposure to the sun is good for human body, but overexposure to the sun is harmful to humans. Part of the sun's ultraviolet rays can make the skin dermis gradually harden, dry skin, loss of elasticity, accelerate aging wrinkles, make the skin surface show up red stain, have a burning feeling, or swelling and even blistering, peeling, and even caused skin cancer. In addition, facial freckles aggravated due to the sunlight. The acne patients under the sun will stimulate acne top oxidation, then become blackheads leave scars.
Products for preventing sunburn, from the recipe structure speaking, primarily to add a variety of sunscreen agents in various matrix. The sunscreen can divide into two categories. One is capable of being dispersed the substance above in the skin, such as titanium dioxide, zinc oxide, kaolin, calcium carbonate, talc, etc., such sunscreens is mainly reduced by scattering ultraviolet contact with the skin, and to prevent the ultraviolet radiation on the skin; another is the substance which can absorb ultraviolet, such as salicylic acid menthyl acetate, menthyl benzoate, salicylic acid, benzyl ester, p-amino benzoic acid ethyl ester or the like. The molecules of these UV absorbers can absorb ultraviolet energy, and then release heat or harmless visible effect, and to protect the human skin from UV damage, modern sunscreen cosmetics and sunscreen are mainly use this substances.
The glutathione manufacturer is apply glutathione in sunscreen cosmetics, found that glutathione have defense effect on ultraviolet reduce skin immunity. In the experiment of the cells were irradiated with UV, compared with sunscreen adding glutathione and do not add glutathione, add glutathione is 1.5 times larger effect of defense approximately. Glutathione prevents skin immune function from UV damage, has successfully produced a stable sunscreens which can prevent reducing immunity.
Glutathione is a white crystalline powder, can dissolve in water, insoluble in alcohol, ether, acetone. Can with lecithin synthesis liposomes, used with the a-hydroxy acid can effective in conditioning the skin and insulation, glutathione’s mercapto group can form a crosslinking bond with cysteine thiol grouping in the hair, often shared with a cationic polymer in perming agents, the hair tissue destruction is less. Glutathione used as cosmetic raw material is more common, and easy to use, it is an ideal cosmetic sunscreens worth promoting.
Source:http://www.cosprm.com
The application of tungsten in various industries
Steel Industry Most of tungsten applied in the production of special steels. The widely used high-speed steel was containing 9-24% of tungsten, 3.8-4.6% of chromium, 1-5% of vanadium, 4-7% of cobalt, 0.7-1.5% of carbon.
Magic effects of coconut oil
According to records, coconut oil can be regarded as the nobility of skin care plant extracts. It was rich in exotic tension of tropical plants, which can enhance the contractile force of the pores, perfectly beautify and nourish the skin.
Exploring the Potentials of Nano-Aluminum Powder
Nano-aluminum powder, a material with remarkable properties due to its minuscule particle size, is revolutionizing various industries with its high reactivity and large specific surface area. Unlike its bulk counterpart, nano-aluminum powder begins to oxidize at a lower temperature of 550°C, compared to the 950°C oxidation point of ordinary aluminum. This lower ignition energy and full combustion without apparent cohesion make it a superior choice for applications requiring high energy and efficiency. The unique characteristics of nano-aluminum powder, such as faster burning rates and greater heat release, are largely influenced by its synthesis method, which determines its particle size, surface area, and shape.
