RESUMO
Diatoms are microalgae encased in highly structured and regular frustules of porous silica. A long-standing biological question has been the function of these frustules, with hypotheses ranging from them acting as photonic light absorbers to being particle filters. While it has been observed that the girdle band pores of the frustule of Coscinodiscus sp. resemble those of a hydrodynamic drift ratchet, we show using scaling arguments and numerical simulations that they cannot act as effective drift ratchets. Instead, we present evidence that frustules are semi-active filters. We propose that frustule pores simultaneously repel viruses while promoting uptake of ionic nutrients via a recirculating, electroosmotic dead-end pore flow, a new mechanism of "hydrodynamic immunity".
Assuntos
Diatomáceas/imunologia , Diatomáceas/virologia , Hidrodinâmica , Diatomáceas/citologia , Diatomáceas/metabolismo , Modelos Biológicos , Porosidade , Dióxido de Silício/química , Dióxido de Silício/metabolismoRESUMO
Recognizing information management as a critical issue, the Joint Commission has deemed it a core chapter in all of its manuals.
Assuntos
Gestão da Informação/normas , Joint Commission on Accreditation of Healthcare Organizations , Humanos , Manuais como Assunto , Estados UnidosRESUMO
Learn what standards the Joint Commission sets for communication, coordination, and continuum of care.
Assuntos
Comunicação , Continuidade da Assistência ao Paciente/normas , Joint Commission on Accreditation of Healthcare Organizations , Planejamento de Assistência ao Paciente/normas , Assistência Centrada no Paciente/normas , Guias de Prática Clínica como Assunto , Humanos , Estados UnidosRESUMO
Learn the Joint Commission's requirements for staffing levels and skill mix and how surveyors determine if your organization measures up.
Assuntos
Competência Clínica/normas , Pessoal de Saúde , Joint Commission on Accreditation of Healthcare Organizations/organização & administração , Admissão e Escalonamento de Pessoal/normas , Pessoal de Saúde/educação , Pessoal de Saúde/organização & administração , Humanos , Avaliação das Necessidades , Estados Unidos , Carga de TrabalhoRESUMO
The author explains how the human resource chapter affects nurse managers' responsibilities toward contracted staff and lists ways to organize orientation and verify competence.
Assuntos
Serviços Contratados/organização & administração , Supervisão de Enfermagem/organização & administração , Admissão e Escalonamento de Pessoal/organização & administração , Sistema de Registros , Competência Clínica , HumanosRESUMO
A fiber-optic contact microsoldering device was demonstrated. It consists of a crystalline fiber with a tapered absorbing tip grown directly onto one end. A tapered tip with a 20-mum end enables the soldering of components with lead spacing as small as 50 mum.