A magnetic resin based on lignin produced using the Kraft process was prepared and characterized. The material, because of its aromatic/aliphatic balance, can be used in oil-spill clean-up processes. The resin was prepared through bulk polycondensation of lignin, cashew nutshell liquid, and formaldehyde in the presence of maghemite nanoparticles. The obtained magnetic composites were studied by Fourier transform infrared spectroscopy, X-ray diffraction, and Small-angle X-ray scattering. Cure degree, magnetic force, and oil removal capability tests were also performed. The results show that the composites possess an elevated cure degree, besides a considerable magnetic force. The materials exhibit a good oil removal capability-the composite containing 3.3 vol % of maghemite can remove 11 parts of oil from water. V C 2012 Wiley Periodicals, Inc. J Appl Polym Sci 126: E304-E311, 2012
Introduction. Myelomeningocele (MMC) is an embryologic neural tube defect. Aim. To determine defecatory habits in MMC patients older and younger than 4 years old according to medullary level and factors affecting catharsis. Patient and methods. Descriptive study of prospective cohort by multidisciplinary team at Posadas Hospital, from March 2003 to March 2017. Inclusion criteria: MMC catered. Exclusion criteria: colostomizated. Results. n = 301. Female: 54%. Age: 1 month to 17 years. Median age: 3 years. GI: 178 patients ≤ 4 years. GII: 123 patients > 4 years. In GI: 82% normal defecation vs. 15% in GII; GI 18% constipation; GII 11% constipation, 79% incontinence. According medullary level: high (thoracic and high lumbar), low (middle lumbar, low lumbar and sacral). Constipation in GI: High 24% and in Low 14% (p = 0.13). GII incontinence in 86% High and in 73% Low (p = 0.06). 37% of walkers without aid, 23% of the children using valves and only 12% of wheelchair bound patients were continent (p = 0.01). Normal school: 30% continent; and 6% who continent attended special school (p = 0.001). Conclusions. 1) More frequent evacuation abnormalities after age of sphincteric control. 2) In ≤ 4 years old, constipation wasn´t related to medullary level; ≥ 4 years old patients defecatory trouble was directly. proportional to medullary level. 3) Special school pupils and wheelchair bound patients > 4 years experienced incontinence degree significantly higher. 4) No difference in defecatory trouble with or without urinary Catheterization. 5) More incontinence in > 4 with ventriculoperitoneal shunt. 6) Functional encopresis must be considered in association with organic factors in this patients.
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