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64529 documents, page 3 of 6453

Penicillins Activate Autolysins Extracted from Both Escherichia coli and Klebsiella pneumoniae Envelopes

Ampicillin at a 50-μg/ml concentration effects a doubling of the autolysis rate of cell envelopes isolated from Klebsiella pneumoniae Mir A12. This antibiotic increases also by two- to threefold the depolymerizing activity of both K. pneumoniae and Escherichia coli crude extracts on a labeled peptidoglycan-lipoprotein complex. Several other penicillins also activate autolysins.

Sur les limites d'application du modèle de Stephens

Les conséquences de l'hypothèse de la conservation de j dans le modèle de Stephens sont analysées. Les conditions de l'applicabilité de cette hypothèse dans le cas des sous-couches isolées (l'extension est faite à N = 4 et N = 3) sont discutées et des explications en sont données. Dans les autres cas, un traitement exact des états propres du mouvement intrinsèque permet néanmoins l'extension du modèle de Stephens sans élargissement de la base de diagonalisation.

The Freshwater Therapontidae of new Guinea

CONTENTS 1. Introduction................... 3 2. Acknowledgements................. 6 3. History of classification............... 7 4. Character variation................. 9 5. Generic classification................ 16 6. Affinities and zoogeography.............. 21 7. Key to the species known from New Guinea.......... 26 8. Genus Helotes.................. 31 9. Genus Therapon................. 31 10. References................... 84 11. Gazetteer................... 86 I. INTRODUCTION The Thera...

Isolation and characterization of a spacerless dinucleosome from H1-deleted chromatin.

Calf thymus chromatin, depleted in histone H1, was digested with micrococcal nuclease and fractionated by column chromatography. 140 base pair nucleosome core particles were isolated along with an unusual particle containing 2 histone octamers and 240 base pairs of DNA. Evidence is presented that the spacer DNA region is absent from these modified dinucleosomes, which appear as stable products of the digestion process. The physical properties of both particles are presented along with brief s...

MAGNON SCATTERING IN FERRIMAGNETIC POLYCRYSTALS WITH INHOMOGENEOUS GRAIN DIAMETERS

Previous experiments of parallel pump relaxation in ferrimagnetic polycrystals have been explained satisfactorily by the transit-time limited magnon lifetime theory. Further work has demonstrated the independent grain behaviour of the imaginary susceptibility vs the r. f. field, h. In this work the dependence of the relaxation phenomena on the grain diameter average x- and on the dispersion σ is considered. It is shown that by suitably choosing θk (the angle between k and the d. c. field H0) ...