Signos de trastorno interno de la ATM sin dislocación meniscal ni enfermedad activa. Revisión a partir de un caso con exploración axiográfica y RMN

En la disfunción cráneomandibular se pueden presentar diversos signos, entre los chasquidos articulares. El presente trabajo hace una revisión a partir de un caso con chasquido articular y sin dislocación, lo cual induce a extremar el diagnóstico por implicaciones terapéuticas posteriores

Detection of a classical Delta Scuti star in the new eclipsing binary system HIP 7666

HIP 7666 is a variable star newly discovered during the Hipparcos mission and classified as of unknown type (ESA 1997). During 23 nights between July 2000 and November 2000, over 2300 CCD observations in the V band were obtained from Hostalets de Pierola and Monegrillo observatories in Spain. These data show that the new variable is a detached eclipsing binary system with an orbital period of 2.37229 days. In addition, one of the components undergoes very short-period oscillations with a main pulsation frequency of 24.46 or 25.47 c/d. HIP 7666 is therefore a new member of the presently very few known detached eclipsing binary systems with a Delta Scuti type component.Comment: 6 pages, 8 Postscript figure

Revisión de la insuficiencia venosa de las extremidades inferiores. Estudio de un caso

La misión principal de la circulación venosa es el drenaje hacia el corazón del CO2 y demás catabolitos originados por el metabolismo celular para su posterior depuración pulmonar, hepática o renal

Clasificación T. L .C. Nueva taxonomía bioestática en prótesis parcial removible

El presente trabajo es un ensayo clínico para ordenar, bajo criterio bioestá­tico, las arcadas parcialmente edéntulas subsidiarias de rehabilitación con prótesis parcial removible. La interrelación entre la topografia (T) de la arcada, la amplitud (L) de la edentación y los índices clínicos de las estructu­ras biológicas intraorales, origina una clasificación que: - favorece la comunicación oral, permitiendo una mejor comprensión del edentulismo problema, y - a través de un ordenamiento de estudios, prefija de manera objetiva, la vía de soporte que ha de tener la restauración parcial removíble a instaurar

Signos de trastorno interno de la ATM sin dislocación meniscal ni enfermedad activa. Revisión a partir de un caso con exploración axiográfica y RMN

En la disfunción cráneomandibular se pueden presentar diversos signos, entre los chasquidos articulares. El presente trabajo hace una revisión a partir de un caso con chasquido articular y sin dislocación, lo cual induce a extremar el diagnóstico por implicaciones terapéuticas posteriores

Lutetian magnetostratigraphic calibration of larger foraminifera zonation (SBZ) in the Southern Pyrenees: the Isuela section

In this paper, we present a chronostratigraphic calibration of the shallow benthic zones (SBZs) of larger foraminifera during Lutetian times based on new magnetostratigraphic data (Isuela section) and two new densely sampled biostratigraphic sections (Isuela and Gabardiella). These sections are located in the External Sierras (Southern Pyrenees) and represent an ideal location to avoid previous chronostratigraphic problems. 1) They belong to a shallow carbonate shelf environment with abundant larger foraminifera, which ensure the reliability of SBZ data. 2) The time span covers almost the entire Lutetian interval. 3) The profiles are sufficiently long to establish trustworthy local scales, both the SBZs (520 m and 760 m in Isuela and Gabardiella respectively) and the paleomagnetic local polarity sequence (LPS) (520 m). 4) The excellent outcropping conditions also permit a detailed paleomagnetic and biostratigraphic sampling to be performed. The LPS at the Isuela section was built after sampling every 2.6 m. In total, more than 359 samples were thermal (244) and alternating field (115) demagnetized. Characteristic remanent magnetization (ChRM) usually dropped at 560 °C. Only 43% the samples (359 demagnetizations) gave reliable directions (high quality) for the LPS. A further short section (Gas line) was also cored (38 samples in 90 m) to obtain more detailed data for the upper part of the section. At the Isuela section, the results allow three pairs of trustable magnetozones to be assembled within the Lutetian. A further 255 samples were taken for biostratigraphic purposes, 55 sites at the Isuela and 52 at the Gabardiella sections being determinant. This density enabled a thorough study of changes in fossil associations to be performed. Assuming a constant accumulation rate within the chron boundaries, absolute ages have been estimated for the biostratigraphic boundaries. Combining all these data allows the previous calibration of SBZ during Lutetian times in the geological time scale to be refined. In particular, with this new data, we identify the SBZ 13/SBZ 14 boundary at 44.46 Ma reaching C20r; a boundary interval spanning from SBZ 14 to SBZ 15 (41.36 and 42.45 Ma) is found within C20n and C19n; and, finally, the top of SBZ 15 can be accurately located at 41.12 Ma (C19r)Unidad de Zaragoza, Instituto Geológico y Minero de España, EspañaDepartamento de Ciencias de la Tierra, Universidad de Zaragoza, EspañaDepartament d'Estratigrafia, Paleontologia i Geociències Marines, Universitat de Barcelona, EspañaConsultant GeologistsUnidad de Tres Cantos, Instituto Geológico y Minero de España, Españ

Unravelling the kinetics of burial remagnetizations

Burial diagenesis is one of the main mechanisms claimed for explaining pervasive remagnetizations in sedimentary basins and orogenic wedges worldwide. It involves authigenic formation (e.g. chemical remagnetization) of magnetic minerals in response to enhanced temperature conditions at deep basinal positions. Key questions about the kinetics of this process in natural cases remain unsolved because most of the best-documented cases occurred during long-lasting magnetic superchrons. The Western Pyrenees display a dual polarity record of a burial remagnetization affecting the deepest part of the Eocene Jaca turbiditic basin and its underlying units. A preliminary study of 49 sites distributed along three cross sections reveals that postfolding (remagnetized) ChRM directions are found within the lowermost part of the studied sedimentary pile, which is affected by cleavage, in such a way that ChRM unblocking temperatures increase as a function of depth. Noteworthy, this remagnetization is associated with hysteresis data typical for chemical remagnetizations (samples falling mainly within the SP+SD+MD mixing line in the Day plot), and displays up to five different polarity zones that are consistent along strike in the three studied cross sections. Prefolding ChRM directions are found, in contrast, in the overlying sequence above the cleavage domain. We intend to carry out a detailed, multidisciplinary study of this remagnetization in the framework of the recently funded UKRIA4D project, that will integrate: A) a full characterization of the remagnetization front combining paleomagnetic and rock-magnetic data; B) characterization of the burial conditions based on SEM and TEM observations of mineral assemblages and temperature estimates from RAMAN spectroscopy on carbonaceous material; and C) magneto-biostratigraphic dating of the 7 km-thick overlying sedimentary sequence. Integration of these data will allow establishment of the burial conditions that led to the observed remagnetization, on which, at least, a qualitative kinetic model for burial remagnetizations will be developed