Scheinbare Viskosit?t von menschlichem Gesamtblut bei verschiedenen hydrostatischen Drucken. I. Untersuchungen an mit antikoagulierender Substanz versetztem Blut unter Verwendung eines neuen Kapillarviskosimeters

Ohne Zusammenfassung     

The decay of143Sm to levels in143Pm

The beta decay of¹⁴³Sm was reinvestigated with the aid of a Ge(Li) detector. Levels of¹⁴³Pm at 271.8, 1,056.5, 1,173.4, 1,342.1, 1,403.2, 1,514.9, 1,752.8, 1,816.3, 1,853.6, (2,000), 2,009.0, 2,080.5, 2,344, 2,443, 2,463, 2,906 and (3,054) keV were established. Logft values for all observed beta transitions have been calculated. Spin and parity assignments have been made from electron capture and positon disintegration considerations and gamma branches. The experimental level scheme of¹⁴³Pm is compared with the results of 1 and 3 q.p. calculations forN=82 nuclei.     

Magnetic circular dichroism in the A,B and C absorption bands of KBr: In+

The magnetic circular dichroism in the A, B and C bands of KBr:In⁺ has been measured as a function of temperature between 4 K and 260 K. Results for the A band agree with those reported previously at one temperature only. Our experimental data on the B and C bands are compared with recent theoretical calculations.     

Steric and electronic limitations of the SRN1 reaction between p-nitrobenzylic substrates and tertiary carbanions

The S_RN1 reaction between sterically hindered p-nitrobenzylic substrates and tertiary carbanions gives C-alkylated products whose yields depend on the steric bulk of both the benzylic substrate and the carbanion, and on the nature of the groups in the carbanion.     

Drug release from hydrogel devices with ratecontrolling barriers

Zero order release of a drug from monolithic polymer devices fails because the drug concentration gradient within the matrix falls with time. In principle, it should be possible to maintain this concentration gradient constant via the introduction of a ratelimiting barrier to solute diffusion at the surface of the device. In this study, progesterone-dispersed monolithic devices were prepared from either polyhydroxyethyl methacrylate (HEMA) or a copolymer of HEMA and methoxyethoxyethyl methacrylate (MEEMA). These monolithic devices were soaked in an ethanol solution of ethylene glycol dimethacrylate (EGDMA) followed by exposure to UV light to create a crosslinked zone at the outer edge. The cross-linked zone has a much lower permeability to solute than the central region of the device and therefore serves as a rate-limiting barrier. Progesterone release studies demonstrated a zero order release from devices with the crosslinked outer layer. Drug release rates were dependent upon the UV treatment time, the EGDMA concentration, and the device soaking time in the EGDMA solution.