RESUMO
The protective properties of nonwoven materials (Spandbond, SMS) used to manufacture 3-5-layer medical masks, by using model physical and bacterial test aerosols, were experimentally assessed. It was shown that the more layers of the materials, the less permeable they became for test aerosols. Three-five-layer masks made from SMS at a density of 42 g/m2 were found to have higher protective properties for oil mist and fine aerosol than those made from Spandbond at a density of 25 g/m2. Five-layer SMS materials at a density of 42 g/m2 have the highest values of bacterial aerosol retention.
Assuntos
Máscaras/normas , Medicina do Trabalho/métodos , Polipropilenos , Dispositivos de Proteção Respiratória/microbiologia , Dispositivos de Proteção Respiratória/normas , Doenças Respiratórias/prevenção & controle , Desenho de Equipamento , Filtração , Humanos , Controle de Infecções , Medicina do Trabalho/instrumentação , Serratia marcescens/isolamento & purificaçãoRESUMO
The permeability of varying density felts (Spandbond, SMS, Tyvek, Sontara) for throw-away medical overalls was experimentally assessed under statistic and dynamic conditions, by using model test aerosols, including bacterial one. Their permeability was shown to decrease with the higher density of the materials under study. Laminated Span-bond contributes to an abrupt reduce in the bacterial penetration of this kind of tissues and enhances their protective properties. The felts CMC, Tyvek, Sontara, and laminated Spanbond were found to have the highest protective properties. In terms of their barrier and protective properties, the felts surpass the tissues used to make re-usable protective medical overalls.
Assuntos
Equipamentos Descartáveis , Resíduos de Serviços de Saúde/análise , Exposição Ocupacional/análise , Roupa de Proteção , Têxteis/análise , Humanos , Técnicas In Vitro , Propriedades de SuperfícieRESUMO
Described within the case study are experimental evaluation data on the remote results of introduction of gene-engineered microorganisms (GEM) of the B-7092 B. subtilis strain into the environment with the follow-up ranging from 1 to 7 years. No bacteria of the above GEM were detected (among selected 19 bacterial cultures) in soil samples from an agricultural farm, where the VETOM 1.1 probiotic was used for the treatment and prevention of cattle; primary and precise identification (two-round PCR with specific primers) was applied. The introduction of the B-7092 B. subtilis strain into the environment did not result in its unlimited growth and proliferation in soil. No transfer of plasmid genes (genes of leukocytic human alpha-2 interferon) from the B-7092 B. subtilis strain GEM to microorganism species available in the environment (soil) was registered. No recombinant plasmid DNA from lysed GEM cells was detected in soil samples.
Assuntos
Bacillus subtilis/genética , Bacillus subtilis/isolamento & purificação , Transferência Genética Horizontal , Interferon-alfa/genética , Microbiologia do Solo , Solo/análise , Agricultura , Animais , Bovinos , Doenças dos Bovinos/tratamento farmacológico , Humanos , Interferon alfa-2 , Leucócitos/metabolismo , Plasmídeos/isolamento & purificação , Reação em Cadeia da Polimerase , Probióticos/uso terapêutico , Proteínas RecombinantesRESUMO
The effects of ointment containing king crab (Paralithodes camtschatica) collagenase on intact skin, thermal, and pyonecrotic wounds were studied in rats by using hematological, biochemical, immunological, and morphological methods. The ointment for the skin and viscera was shown to be safe. It is highly effective in debriding the infected wounds. Different concentrations of collagenase were tested. The concentration of collagenase was recommended to be 0.2 mg/g ointment for use.