Biodeterioration Research 1 by Gerald C. Llewellyn (auth.), Gerald C. Llewellyn, Charles E.

By Gerald C. Llewellyn (auth.), Gerald C. Llewellyn, Charles E. O’Rear (eds.)

Man-made cloth fibers are usually encountered as hint facts in felony investigations. This examine tested the results of burial in soil at the biodeterioration of man-made cloth fibers equivalent to cellulose acetate, nylon, polyesters and acrylics. Cellulose acetate fibers started to convey indicators of decomposition inside of months after burial in universal backyard topsoil and have been thoroughly degraded inside 4 to 9 months. It used to be discovered that seriously decomposed cellulose acetate fibers may be pointed out via pyrolysis-gas liquid chromatography even if different tools corresponding to polarized mild microscopy and dispersion staining failed. The solubility habit of the cellulose acetate fibers additionally was once altered. the opposite different types of fibers confirmed no detectable alteration on the finish of the twelve-month examine. REFERENCES American organization of cloth Chemists and Colorists (1971). AATCC Technical guide, AATCC, Triangle Park, NC. cook dinner, R., and Paterson, M.D. (1978). New strategies for the identifi- tion of microscopic samples of fabric fibers through infrared spectroscopy. Forensic Sci. Int., 12, 237-243. DeForest, P.R., Geansslen, R.E., and Lee, H.C. (1983). Forensic technological know-how: An advent to Criminalistics, McGraw-Hill e-book corporation, new york. Federal Bureau of research (1978). Solubility schemes by way of usual classification. Federal Bureau of research, Washington, DC. Fong, W. (1982). speedy microscopic id of artificial fibers in one liquid mount. ~ Forensic Sci., 27, 257-263.

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The endotoxin contamination was consistently high in both studies for all varieties, with dust from carded SJ5 as the most contaminated. A final comparison of the acute pulmonary function responses to dusts from crop year 1982 and 1983 is shown in Figure 4. this figure were standardized to gravimetric The data in (cotton) dust 3 concentration as (" per mg/m ). The greatest differences between the two study-years can be noted in the mean delta FEY1 (" per mg/m3 ) for the TX-produced varieties. Both CA-grown and MS-grown cottons elicited approximately similar responses to the carded cotton dusts from DPL61, GSA71 and SJ5, although some variation in magnitude is noted between crop year 1982 and 1983 cotton dusts.

Two bacterial enzymes hydrolyzing oligomers of ~. Fukumura, T. 6-amino caproic acid. ~. , 59, 537-544. R. (1979). Biodegradable polymers; chymotrypsin degradation of a low molecular weight poly(ester-urea) containing phenylalanine. ~. , 23, 429-437. J. (1984). Mechanism of the biodegradation of polycaprolactone, In Biomedical Applications of Polymers, pp. S. W. Shalaby. D. A. Horbett. ), Plenum Publ. , NY. , and Stutter, J. (1979). Biodegradation of polystyrene, poly(methyl methacrylate), and phenol formaldehyde.

The reaction mixture contained: enzyme, 1. 75 ml cholate buffer (as above) cholate buffer). D. 420/min/mlx10-3 • 18 The optimum temperature for enzyme activity was determined by prewarming all of the components of the reaction mixture for 10 min at the appropriate temperature, mixing and holding them at that temperature in a water bath, except for the time when making the reading. Temperatures used were: 25, 31, 36, 41, and 47°C. Temperature stability was determined by holding 2 ml aliquots of the enzyme preparation at the desired temperature for 30 min, followed by chilling in an ice bath.

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