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Copyright of Revista ION is the property of Universidad Industrial de Santander and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Abstract Objective Due to the popularity of 3D technology, surgeons can create specific surgical guides and sterilize them in their institutions. The aim of the present study is to compare the efficacy of the autoclave and ethylene oxide (EO) sterilization methods for objects produced by 3D printing with polylactic acid (PLA) material. Methods Forty cubic-shaped objects were printed with PLA material. Twenty were solid and 20 were hollow (printed with little internal filling). Twenty objects (10 solid and 10 hollow) were sterilized in autoclave, forming Group 1. The others (10 solid and 10 hollow) were sterilized in EO, composing Group 2. After sterilization, they were stored and referred to culture. Hollow objects of both groups were broken during sowing, communicating the dead space with the culture medium. The results obtained were statistically analyzed (Fisher exact test and residue analysis). Results In group 1 (autoclave), there was bacterial growth in 50% of solid objects and in 30% of hollow objects. In group 2 (EO), growth occurred in 20% of hollow objects, with no bacterial growth in solid objects (100% of negative samples). The bacteria isolated in the positive cases was non-coagulase-producing Staphylococcus Gram positive. Conclusions Sterilization by both autoclave and EO was not effective for hollow printed objects. Solid objects sterilized by autoclave did not demonstrate 100% of negative samples and were not safe in the present assay. Complete absence of contamination occurred only with solid objects sterilized by EO, which is the combination recommended by the authors.

Copyright of Environmental & Social Management Journal / Revista de Gestão Social e Ambiental is the property of Environmental & Social Management Journal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Biodegradable plastics based on starch have acquired considerable importance in view of their possibility of replacing the conventional plastics derived from fossil sources. The aims of this research was to evaluate the effect of the addition of keratin (0, 10 and 20%, relative to the amount of starch) from chicken feathers on the properties of corn-glycerol starch biofilms. Films is obtained by casting and the tests to obtain and characterize them were conducted in the physicochemical and chemical processes laboratories from Federal Institute of Education, Science and Technology of Rio Grande do Norte, Campus Nova Cruz. The parameters thickness, weight, density, transparency, humidity, water solubility and biofilms water vapor permeability were evaluate. The values of transparency, thickness, weight and density of the films no affected with treatments applied. The water solubility and the water vapor permeation rate of the films reduced with increasing amount of keratin. [ABSTRACT FROM AUTHOR]

The present research was conducted with the objective of characterizing bioplastic films obtained through sweet powder with different starch proportions and relating them to the different plastics, already existing, identifying physical, chemical and thermal characteristics. Bearing in mind that the replacement of plastics used today in the production of building materials, packaging, automotive parts, etc; they come from non-renewable materials and this replacement would be of great contribution to the environment by the production of the polymeric films present in this study, we will present its composition from renewable sources. [ABSTRACT FROM AUTHOR]

Copyright of Revista Metropolitana de Sustentabilidade is the property of Revista Metropolitana de Sustentabilidade - RMS and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)