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In this paper, we consider an issue of hand posture classification. We improve a recently proposed signature, a matrix containing the distance of all contour pixels to an arbitrary reference point. Adequate pre-processings ensure the invariance properties of the signature. Candidate postures are pre-selected with a surface criterion, and Principal Component(More)
A casein kinase of type II has been highly purified from Xenopus laevis ovary. A new experimental protocol has been developed for the purification, consisting in four chromatographic steps: hydrophobic on tyrosine-agarose, ion exchange on DEAE-Sepharose, affinity on heparin-Sepharose and fast protein liquid on Mono Q. The purification was greater than(More)
  • A. Vital, C. Vital, J. P. Riviere, C. Brechenmacher, J. Marot
  • 1987
Four cases of early infantile polyneuropathy with defective myelination are reported. The peripheral nerve was studied by light and electron microscopy; different morphological characteristics have been noticed in these patients. Case 1 presented aspects of defective myelination with atypical “onion bulb” formation composed of multiple layers of basement(More)
L-leucine uptake into full-grown oocytes of Xenopus laevis is a saturable process which is Na+ dependent and presumably coupled to Na+ gradient. Our results indicate that progesterone (10(-6) M) Blocks abruptly, around the germinal vesicle breakdown, the saturable transport of L-leucine. p-Chloromercuribenzoate (10(-4) M) induces maturation and after a(More)
Xenopus laevis oocytes were microinjected with low molecular weight phosphoesters such as 2-glycerophosphate, phosphotyrosine, phosphoserine, phosphothreonine, 4-nitrophenyl phosphate, and orthophosphate. These compounds were able to induce a considerable reduction in the time course of progesterone-induced maturation, with 2-glycerophosphate being the most(More)
Circular features are commonly sought in digital image processing. The subspace-based line detection (SLIDE) method proposed to estimate the center and the radius of a single circle. In this paper, we introduce a novel method for estimating several radii while extending the circle estimation to retrieve circular-like distorted contours. Particularly, we(More)
The results presented here show that a decrease in the concentration of total polyamines, due to a decrease in putrescine and spermine, occurs during oogenesis in Xenopus laevis. The microinjection of spermine or spermidine decreases the hormonal responsiveness (maturation) of the fully-grown oocytes. This effect is synergistic with that already described(More)
Recommended by Fulvio Gini Previous studies dedicated to source localization are based on the spectral matrix algebraic properties. In particular, two noneigenvector methods, namely, propagator and Ermolaev and Gershman (EG) algorithms, exhibit a low computational load. Both methods are based on spectral matrix structure. The first method is based on the(More)