Epidemiological impact of waning immunization on a vaccinated population

This is an epidemiological SIRV model based study that is de- signed to analyze the impact of vaccination in containing infection spread, in a 4-tiered population compartment comprised of susceptible, infected, recov- ered and vaccinated agents. While many models assume a lifelong protection through vaccination, we focus on the impact of waning immunization due to conversion of vaccinated and recovered agents back to susceptible ones. Two asymptotic states exist, the \disease-free equilibrium" and the \endemic equi- librium" and we express the transitions between these states as function of the vaccination and conversion rates and using the basic reproduction number. We nd that the vaccination of newborns and adults have dierent consequences on controlling an epidemic. Also, a decaying disease protection within the re- covered sub-population is not sucient to trigger an epidemic on the linear level. We perform simulations for a parameter set modelling a disease with waning immunization like pertussis. For a diusively coupled population, a transition to the endemic state can proceed via the propagation of a traveling infection wave, described successfully within a Fisher-Kolmogorov framework

Vacuum evaporable spin crossover complexes physicochemical properties in the crystalline bulk and in thin films deposited from the gas phase

Vacuum-evaporable Fe(ii) complexes exhibit greatly different spin-crossover behaviour in thin films deposited from the gas phase and the crystalline bulk.</p

A course in English for engineers...

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Clicking [Mo CO 3 triphos ] to an azide terminated alkylthiol SAM structural, spectroscopic and electrochemical investigations

The synthesis and characterization of a new, linear triphos type pincer ligand furnished with an ethynyl moiety in the ligand backbone etPPPhTMSP and the derived tricarbonyl complex [Mo CO 3 etPPPhTMSP ] are described. Deprotection of the latter leads to [Mo CO 3 etPPPhHP ] which in turn is clicked onto an N3 terminated Au surface. The resulting monolayer is characterized by XPS, IRRAS and cyclic voltammetry, providing information on its chemical composition, the degree of surface coverage and the orientation of the headgroup. On the basis of these results, a protocol for the functionalization of surfaces with redox active transition metal complexes for applications in, e.g., electrocatalysis is develope