2,327 research outputs found
Use of Living Donors in Kidney Transplantation in Man
A series is presented of 238 living renal donors who have been followed for periods of from eight months to eight years. Careful selection of donors is mandatory in order to avoid postoperative mortality or morbidity. Anatomic variations which may affect the donor or recipient operations are discussed. There were no deaths, and postoperative complications were usually minor. The most common were atelectasis or pneumonitis or both, pneumothorax, and urinary tract infection. No patients developed permanent renal insufficiency. Compensatory hypertrophy of the remaining kidney resulted in restoration of creatinine clearance and para-aminohippuric acid clearance to two thirds or more of preoperative values. The use of related living donors is justified by the low risk to the donor and the prolongation of life in the recipients. © 1970, American Medical Association. All rights reserved
Source attribution, prevalence and enumeration of Campylobacter spp. from retail liver
Funding Information: We thank Food Standards Agency, Scotland for funding this work.Peer reviewedPreprin
Seismicity and crustal structure of the southern main Ethiopian rift: new evidence from Lake Abaya
The Main Ethiopian Rift (MER) has developed during the 18 Ma-Recent separation of the Nubian and Somalian plates. Extension in its central and northern sectors is associated with seismic activity and active magma intrusion, primarily within the rift, where shallow (urn:x-wiley:15252027:media:ggge22586:ggge22586-math-00015 km) seismicity along magmatic centers is commonly caused by fluid flow through open fractures in hydrothermal systems. However, the extent to which similar magmatic rifting persists into the southern MER is unknown. Using data from a temporary network of five seismograph stations, we analyze patterns of seismicity and crustal structure in the Abaya region of the southern MER. Magnitudes range from 0.9 to 4.0; earthquake depths are 0–30 km. urn:x-wiley:15252027:media:ggge22586:ggge22586-math-0002 ratios of urn:x-wiley:15252027:media:ggge22586:ggge22586-math-00031.69, estimated from Wadati diagram analysis, corroborate bulk-crustal urn:x-wiley:15252027:media:ggge22586:ggge22586-math-0004 ratios determined via teleseismic P-to-S receiver function H-urn:x-wiley:15252027:media:ggge22586:ggge22586-math-0005 stacking and reveal a relative lack of mafic intrusion compared to the MER rift sectors to the north. There is a clear association of seismicity with the western border fault system of the MER everywhere in our study area, but earthquake depths are shallow near Duguna volcano, implying a shallowed geothermal gradient associated with rift valley silicic magmatism. This part of the MER is thus interpreted best as a young magmatic system that locally impacts the geothermal gradient but that has not yet significantly modified continental crustal composition via rift-axial magmatic rifting
The Cauchy problem for a class of two-dimensional nonlocal nonlinear wave equations governing anti-plane shear motions in elastic materials
This paper is concerned with the analysis of the Cauchy problem of a general
class of two-dimensional nonlinear nonlocal wave equations governing anti-plane
shear motions in nonlocal elasticity. The nonlocal nature of the problem is
reflected by a convolution integral in the space variables. The Fourier
transform of the convolution kernel is nonnegative and satisfies a certain
growth condition at infinity. For initial data in Sobolev spaces,
conditions for global existence or finite time blow-up of the solutions of the
Cauchy problem are established.Comment: 15 pages. "Section 6 The Anisotropic Case" added and minor changes.
Accepted for publication in Nonlinearit
A Reappraisal of the H-κ Stacking Technique : Implications for Global Crustal Structure
We thank two anonymous reviewers and editor Michael Ritzwoller for insightful comments which have improved this manuscript. We also thank H. Meek for hard work during the early stages of this project and S. Pilidou, I. Dimitriadis, P. Iosif and their colleagues at the Geological Survey Department of Cyprus for their help establishing the TROODOS network (Bastow et al., 2017). V. Lane and D. Daly (both of SEIS-UK), A. Boyce, M. Liddell and R. Kounoudis were all excellent field assistants in Cyprus. SAC (Helffrich et al., 2013) and GMT (Wessel and Smith, 1991) software were used to process and image seismic data, which were sourced from IRIS DMC and ORFEUS. C.S. Ogden is funded by the Natural Environment Research Council (NERC) Doctoral Training Partnership: Science and Solutions for a Changing Planet, Grant Number NE/L002515/1. S. Rondenay’s contribution to this work was supported by Career Integration Grant 321871 - GLImER from the FP7 Marie Curie Actions of the European Commission, and by the Research Council of Norway FRINATEK programme through SwaMMIS project 231354.Peer reviewedPostprin
First Results from the CHARA Array. II. A Description of the Instrument
The CHARA Array is a six 1-m telescope optical/IR interferometric array
located on Mount Wilson California, designed and built by the Center for High
Angular Resolution Astronomy of Georgia State University. In this paper we
describe the main elements of the Array hardware and software control systems
as well as the data reduction methods currently being used. Our plans for
upgrades in the near future are also described
Mass and Angular Momentum Transfer in the Massive Algol Binary RY Persei
We present an investigation of H-alpha emission line variations observed in
the massive Algol binary, RY Per. We give new radial velocity data for the
secondary based upon our optical spectra and for the primary based upon high
dispersion UV spectra. We present revised orbital elements and an estimate of
the primary's projected rotational velocity (which indicates that the primary
is rotating 7 times faster than synchronous). We use a Doppler tomography
algorithm to reconstruct the individual primary and secondary spectra in the
region of H-alpha, and we subtract the latter from each of our observations to
obtain profiles of the primary and its disk alone. Our H-alpha observations of
RY Per show that the mass gaining primary is surrounded by a persistent but
time variable accretion disk. The profile that is observed outside-of-eclipse
has weak, double-peaked emission flanking a deep central absorption, and we
find that these properties can be reproduced by a disk model that includes the
absorption of photospheric light by the band of the disk seen in projection
against the face of the star. We developed a new method to reconstruct the disk
surface density distribution from the ensemble of H-alpha profiles observed
around the orbit, and this method accounts for the effects of disk occultation
by the stellar components, the obscuration of the primary by the disk, and flux
contributions from optically thick disk elements. The resulting surface density
distribution is elongated along the axis joining the stars, in the same way as
seen in hydrodynamical simulations of gas flows that strike the mass gainer
near trailing edge of the star. This type of gas stream configuration is
optimal for the transfer of angular momentum, and we show that rapid rotation
is found in other Algols that have passed through a similar stage.Comment: 39 pages, 12 figures, ApJ in press, 2004 June 20 issu
The cigarette box as an advertising vehicle in the UK : a case for plain packaging
This research aimed to study tobacco advertising between 1950-2003 and to evaluate the role of the cigarette box in advertising. Tobacco company advertisements (n = 204) were coded for content and meanings used to promote their product. There was a significant shift from cigarettes being displayed to the cigarette box only. Changes in advertising and the meanings evoked were unrelated to changes in smoking behaviour. It is argued that the cigarette box has absorbed the meanings associated with smoking and has become an effective vehicle for advertising. It is also argued that this can only be minimised with plain packaging
Analytical and numerical analyses of the micromechanics of soft fibrous connective tissues
State of the art research and treatment of biological tissues require
accurate and efficient methods for describing their mechanical properties.
Indeed, micromechanics motivated approaches provide a systematic method for
elevating relevant data from the microscopic level to the macroscopic one. In
this work the mechanical responses of hyperelastic tissues with one and two
families of collagen fibers are analyzed by application of a new variational
estimate accounting for their histology and the behaviors of their
constituents. The resulting, close form expressions, are used to determine the
overall response of the wall of a healthy human coronary artery. To demonstrate
the accuracy of the proposed method these predictions are compared with
corresponding 3-D finite element simulations of a periodic unit cell of the
tissue with two families of fibers. Throughout, the analytical predictions for
the highly nonlinear and anisotropic tissue are in agreement with the numerical
simulations
Barium Sulfate Crystallization in the Presence of Variable Chain Length Aminomethylenetetraphosphonates and Cations (Na +
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