Grass, color

Durability. Grass-like surfaces intended for heavy-duty athletic use should have a service life of at least eight years, a common warranty period provided by suppHers. Lifetime is more or less proportional to the ultraviolet (uv) exposure (sunlight) and to the amount of face ribbon available for wear, but pile density and height also have an effect. Color is a factor generally uv absorption is highest with red fabrics and least with blue. In addition, different materials respond differendy to abrasive wear. These effects caimot be measured except in simulated field use and controlled laboratory experiments, which do not necessarily redect field conditions. 

Observable Characteristics - Physical State (as shipped) Compressed gas Color. Colorless Odor Sharp, pungent odor in higher concentrations like new-mown grass in low concentrations. 

Color photo of grass growing outdoors. (Pictured as found on Erowid.)... 

With a solution of ninhydrin in pyridine, 4(5)-aminoimidazole (25 R = H) gave a grass-green color, and with ferric chloride solution in acetic acid a purple coloration was observed. Acidic solutions of bromine and potassium permanganate were decolourized by 4(5)-aminoimidazole (25 ... 

One-tenth gram powdered grass, 5ml petroleum ether grind in mortar and let soak fifteen minutes. Filter and add 1ml of the petroleum ether carefully to 2 ml 15% HC1 in absolute ethanol. Red color at boundary of two layers indicates THC. After shaking, the upper layer is colorless and the lower orange-pink which turns colorless after addition of 1 ml of water. Alternatively, evaporate the petroleum ether, add 2 ml Duquenois reagent (12 drops acetaldehyde, 1 g vanillin, 50 ml ethanol), 2 ml HC1 and stir. Let stand 10 minutes and add 2 ml chloroform shake and let separate. A purple chloroform layer indicates THC. 

At the point of writing, no GM crops are yet available to gardeners, but developments on the horizon include peculiar colors, such as blue carnations and roses grass that does not need mowing and novel perfumes. This novelty may prove to be more costly than we can possibly imagine. 

Lakes, rivers, swamps, and marshes - common in temperate areas - contribute little to the diversity of natural products. Abundant dull-green grass and dull-colored fish and moUusks characterize lakes and rivers, in contrasts with the vivid colors of tropical fish and seaweeds. Haplosclerid sponges are occasionally abundant in freshwater, but their secondary metabolism is limited to demospongic acids (Dembisky 1994), in contrast with the variety of metabolites from marine sponges in the same order. Where not for cyanobacteria (which are as rich of unusual metabolites as the marine strains), tropical amphibians, and aquatic fimgi, freshwater ecosystems would have passed unnoticed in this book. 

Light-colored young grass peat, nearly un-1 -n-eiis... 

VI. —Dense peat, of a black.brown color, in which vegetal structure is nearly obliterated, but in which the leaves of grasses... 

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