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71428 documents, page 1 of 7143

Compostos de adição entre iodetos de itrio e lantanídeos(III) e a N,N,N\',N\' - tetrametilmalonamida

A reação entre a N,N,N\',N\'-tetrametilmalonamida e os iodetos de lantanídeos e ítrio em acetona conduziu a formação dos compostos de adição de fórmula geral LnI3.xTMMA (x = 5, Ln= La, Ce; x = 4, Ln = Pr - Lu, V). Os produtos da reação são cristalinos e apresentam a coloração característica dos correspondentes íons lantanídeos , porém bem menos pronunciadas; não são, em geral, higroscópicos; são bastante solúveis em água, nitrometano e acetonitrila, menos solúveis em metanol e etanol, fracame...

The effect of a varying Mg2+free concentration upon the kinetic behaviour of human liver L-type pyruvate kinase

We have proposed negative cooperativity for human liver L-type pyruvate kinase, a phenomenon also observed in: Lineweaver-Burk plots V⁻¹ versus [phosphoenolpyruvatel]⁻¹ were straight lines at low phosphoenolpyruvate concentrations, and bent downward near they axis (high phosphoenolpyruvate concentrations). Our conclusions were drawn from experiments performed at Mg²⁺total = 12 mM or 20 mM. However, phosphoenolpyruvate has been proposed to bind Mg²⁺free with a Keq = 5.5 X 1O⁻³ M⁻¹ at 25°C. So,...

High resolution neutron diffraction study of α-uranium

We have performed at I.L.L. a high resolution neutron diffraction study of α-U. The search along (h00), (0k0) and (00l) directions, for periodic lattice distortions associated with a possible charge-density wave (C.D.W.) below 43 K has been negative. We have measured for the first time the first order transition at 37 K and found : (Ɗa/a = - 13 × 10-5 (±2) ; Ɗb/b = - 4 × 10-5 (±2) ; Ɗc/c = 6 × 10-5 (±2)).

Topological arrangement in microsomal membranes of hepatic haem oxygenase induced by cobalt chloride.

1. The microsomal haem oxygenase activity induced by the administration of CoCl2 was found mainly in the smooth-surfaced microsomal fraction, whereas that of the untreated control animals was widely distributed in smooth-surfaced microsomal, rough-surfaced microsomal and Golgi fractions. 2. When microsomal preparation was incubated and the time course of the distribution of biliverdin between the membranes and the medium was followed, most of the biliverdin formed was found first in the mediu...

Phase transitions in highly-correlated f-electron systems with fluctuating valence

A formalism is presented for treating electrons in highly-correlated spin-orbit coupled multiplet levels in f-shells, which are also hybridized with valence or conduction states. This is achieved by introducing operators which cause transitions between the configurations, but project out all other configurations. The Zwanzig-Mori projection operator technique is exploited to derive results for the electron Green's functions, which are then solved self-consistently. The lowest order self-consi...

A new Heliconia (Musaceae) from Suriname

In the course of next year a revision of the surinam Musaceae will be published. A new Heliconia species recognized during this study, is described here.

Pectinolytic enzymes of large rumen treponemes.

Large spiral organisms isolated from the rumen of cattle produced and released into the external environment a complex of pectinolytic enzymes, consisting mainly of poly(1,4-alpha-D-galacturonide) lyase (EC 4.2.2.2, formerly EC 4.2.99.3), most active at pH 8.0 to 9.0, and another enzyme acting at pH below 7.0, probably a poly(1,4-alpha-D-galacturonide) glycanohydrolase (EC 3.2.1.15). The mixture of enzymes degraded polygalacturonate to saturated and unsaturated monogalacturonates as the end p...