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Such treatment provides some protection by excluding water and other weathering agents, but it stains the stone permanently. During the renaissance Europeans experimented with the use of topical varnishes and sealants made from ingredients such as egg white, natural resins and silica, which were clear, could be applied wet and harden to form a ...
The alkali–silica reaction (ASR), also commonly known as concrete cancer, [3] is a deleterious internal swelling reaction that occurs over time in concrete between the highly alkaline cement paste and the reactive amorphous (i.e., non-crystalline) silica found in many common aggregates, given sufficient moisture.
1966 – Taxol, anti-cancer compound, isolated from the yew plant; 1967 – Camptothecin, anti-cancer compound, isolated from the Camptotheca acuminata, the Chinese Happy Tree, which was used as a cancer treatment in traditional Chinese medicine. [23] It is the source of chemotherapy drugs: topotecan and irinotecan.
Quarry tile is a building material, usually 1 ⁄ 2 to 3 ⁄ 4 inch (13 to 19 mm) thick, made by either the extrusion process or more commonly by press forming and firing natural clay or shales. [ 1 ] [ 2 ] Quarry tile is manufactured from clay in a manner similar to bricks . [ 3 ]
What Causes Good Greens To Go Bad. Unlike what the post suggests, leafy greens aren’t a major source of ethylene.But they are sensitive to produce that emits the gas. That’s why you should ...
Cancer Research UK note that superfoods are often promoted as having an ability to prevent or cure diseases, including cancer; they caution, "a healthy, balanced and varied diet can help to reduce the risk of cancer but it is unlikely that any single food will make a major difference on its own."
A new study distinguishes between two distinct phases of Alzheimer's disease: an early, 'stealth' one without symptoms, and a second phase that aggressively damages the brain.
"There was nothing he wouldn't do for his students," Morton told CBS News. "He's just one hell of a man, you know. There's my parents, and there's Walt."