Modulation of the effectiveness of 17-alpha-hydroxy-20-beta-dihydroprogesterone or of a gonadotrophic extract on the in vitro intrafollicular maturation of oocytes of the rainbow trout Salmo gairdnerii by various non-maturing steroids [Translation from: Compte Rendu Hebdomadaire des Seances de l'Academie des Sciences, Paris, Series D 281, 811-814, 1975]

The effectiveness of 17 α-hydroxy-20 β-dihydroprogesterone (17 α-20 β Pg) or of a trout hypophyseal gonadotrophic extract on the in vitro intrafollicular maturation of trout oocytes can be modulated by steroids which do not have a direct maturing effect; the effectiveness of the gonadotrophic extract is lowered by oestradiol and oestrone and increased by testosterone. As these steroids have no significant effect on maturation induced by 17 α-20 β Pg, the site of their activity is probably in the follicular envelopes. Corticosteroids, and Cortisol and cortisone in particular increase the effectiveness of the gonadotrophic extract, but increase the effectiveness of 17 α-20 β Pg even more strongly, suggesting that this 'progestagen' has a direct effect on oocyte sensitivity.

Lq estimates for rearrangements of Fourier series

This work is concerned with estimating the upper envelopes S* of the absolute values of the partial sums of rearranged trigonometric sums. A.M. Garsia [Annals of Math. 79 (1964), 634-9] gave an estimate for the L₂ norms of the S*, averaged over all rearrangements of the original (finite) sum. This estimate enabled him to prove that the Fourier series of any function in L₂ can be rearranged so that it converges a.e. The main result of this thesis is a similar estimate of the L_q norms of the S*, for all even integers q. This holds for finite linear combinations of functions which satisfy a condition which is a generalization of orthonormality in the L₂ case. This estimate for finite sums is extended to Fourier series of L_q functions; it is shown that there are functions to which the Men’shov-Paley Theorem does not apply, but whose Fourier series can nevertheless be rearranged so that the S* of the rearranged series is in L_q.

Series representation of the Gaussian beam far-field diffracted by annular aperture

Accurate, analytical series expressions for the far-field diffraction of it Gaussian beam normally incident on a circular and central obscured aperture are derived with the help of the integration of parts method. With this expression, the far-field intensity distribution pattern can be obtained and the divergence angle is deduced too. Using the first five items of the series, the accuracy can satisfy most laser application fields. Compared with the conventional numerical integral method, the series representation is very convenient for understanding the physical meanings. (C) 2007 Elsevier GmbH. All rights reserved.

Interpretación litoestratigráfica y paleogeográfica del Jurásico marino del este Cantabria-oeste de Vizcaya en base a diagrafías de sondeo y su correlación con series tipo

Este trabajo se centra en el estudio del Jurásico marino (Lías y Dogger) de un área de la parte central de La Cuenca Vasco-Cantábrica situada en el este de Cantabria y oeste de Vizcaya donde sus afloramientos son muy escasos pero se dispone de datos de sondeos de exploración petrolífera (Fig 1A y B), poniendo especial interés en la localización y distribución lateral de los niveles de rocas madre de hidrocarburos (black shales) y de potenciales almacenes (unidades carbonatadas fracturadas o dolomitizadas). La sucesión del Jurásico de la Cuenca Vasco-Cantábrica (CVC) está formada por dos unidades diferenciadas por edad y ambiente sedimentario. Por una parte tenemos los materiales del “Jurásico marino” (Robles et al., 1989) que representan la mayor parte de la sucesión (Lías y Dogger) y por otro lado, tenemos los materiales del “Jurásico continental” pertenecientes exclusivamente al Tithoniense Superior y que se engloban en las facies Purbeck que abarcan hasta el Berriasiense (Rat 1962).