Parvovirus B19,a small,single-stranded DNA virus,occurs worldwide in sporadic cases or within clustered outbreaks.There are three genotypes within the Erythroparvovirus genus.Parvovirus B19 genotype 1 is the predomina...Parvovirus B19,a small,single-stranded DNA virus,occurs worldwide in sporadic cases or within clustered outbreaks.There are three genotypes within the Erythroparvovirus genus.Parvovirus B19 genotype 1 is the predominant one,while genotypes 2 and 3 are found much less frequently.1 The main route of transmission is via respiratory particles.It shows a variety of clinical presentations in immunocompetent patients.Most of them report non-specific symptoms whereas 25%of them will be asymptomatic.展开更多
To the Editor,Half a century ago,one of the most important theoretical physicists who shaped the field of condensed matter physics,Professor Philip Anderson,expressed in his landmark article“More is Different”[1]tha...To the Editor,Half a century ago,one of the most important theoretical physicists who shaped the field of condensed matter physics,Professor Philip Anderson,expressed in his landmark article“More is Different”[1]that“...the behavior of large and complex aggregates of elementary particles,it turns out,is not to be understood in terms of a simple extrapolation of the properties of a few particles.Instead,at each level of complexity entirely new properties appear...”.The concept“More is Different”emphasized the significance of emergence in complex systems,where emergent behaviors and properties that cannot be found from the individual parts.Professor Anderson’s own research in condensed matter physics also reflects the importance of emergence and complexity science.He was most concerned about how complex phenomena emerge from simple systems[2,3].展开更多
文摘Parvovirus B19,a small,single-stranded DNA virus,occurs worldwide in sporadic cases or within clustered outbreaks.There are three genotypes within the Erythroparvovirus genus.Parvovirus B19 genotype 1 is the predominant one,while genotypes 2 and 3 are found much less frequently.1 The main route of transmission is via respiratory particles.It shows a variety of clinical presentations in immunocompetent patients.Most of them report non-specific symptoms whereas 25%of them will be asymptomatic.
文摘To the Editor,Half a century ago,one of the most important theoretical physicists who shaped the field of condensed matter physics,Professor Philip Anderson,expressed in his landmark article“More is Different”[1]that“...the behavior of large and complex aggregates of elementary particles,it turns out,is not to be understood in terms of a simple extrapolation of the properties of a few particles.Instead,at each level of complexity entirely new properties appear...”.The concept“More is Different”emphasized the significance of emergence in complex systems,where emergent behaviors and properties that cannot be found from the individual parts.Professor Anderson’s own research in condensed matter physics also reflects the importance of emergence and complexity science.He was most concerned about how complex phenomena emerge from simple systems[2,3].
