Third-generation glucose biosensor incorporated in a conducting printing ink

A biosensor based on a conducting screen-printing ink for the direct amperometric measurement of glucose is described. Carbon electrode prints, containing the work, reference and auxiliary electrodes, are used as the substrate for the sensor. The active parts of the carbon ink are the redox enzyme glucose oxidase and the conducting polymer poly...

Environmental stress cracking of PVC and PVC-CPE - Part I Crazing

The craze initiation of PVC and PVC-CPE in a number of vapour and liquid environments was studied. The observed decrease in the craze-initiation stress could be ascribed to the absorption of components by the PVC and the PVC-CPE matrix. The magnitude of the absorption depends on the activity of the components and on their interaction with the...

Early cross-linked fibrin in human plasma contains α-polymers with intact fibrinopeptide A

alpha-polymer formation, as opposed to gamma-chain dimerization has been considered a relatively late event in factor XIII-induced fibrin stabilization. Recently it has been shown, however, that plasma from healthy individuals and from patients with fibrinaemia contains small amounts of soluble fibrin/fibrinogen oligomers interlinked through...

Conductivity and electron density of undoped model compounds of poly(phenylene vinylene)

Fourteen derivatives of trans,trans-1,4-bis[2-phenylethenyl]benzene were synthesized by Wittig reactions as model compounds of poly(paraphenylene vinylene). Structure, configurational homogeneity and absence of ionic impurities were controlled by mass spectrometry, infrared and neutron activation analysis, respectively. Crystallographic unit...

Dependence of relaxation times of glassy polymers on their specific volume

This paper deals with the volume relaxation and simultaneous changes in mechanical properties that occur after complicated thermal histories. The histories were chosen such that, at the final measuring temperature, the specific volume v passes through a maximum with increasing time. It is shown that, for polystyrene, poly(vinyl chloride) and...

Thermal investigation of unstable substances, including a comparison of different thermal analytical techniques

Changes of lymphocyte kinetics in the normal rat, induced by the lymphocyte mobilizing agent polymethacrylic acid

The changes in lymphocyte kinetics induced by the lymphocyte mobilizing agent polymethacrylic acid (PMAA) were studied in the normal rat. Quantitative data are presented concerning the degree of lymphocyte mobilization in the spleen and in various lymph nodes at different times after PMAA administration. Data were also obtained regarding the...

Tearing experiments, a study in cohesion