845 research outputs found
Zur anthropologie der sexualitat
Dada la discusión vasta y confusa acerca de la sexualidad humana el autor intenta
centrar el tema en su orden antropológico. Filosófico-antropológicamente se
presentan dos aspectos que necesitan aclaración, y, posteriormente hay que ver
la relación entre ambos: el primer aspecto se refiere a la naturaleza de la sexualidad
en general, viendo su esencia determinada por su finalidad y su forma de
presentarse. El segundo aspecto trata de la personalidad del hombre, su naturaleza
y sus dimensiones básicas. La sÃntesis marca el sistema coordinador para
integrar la sexualidad en el ámbito de la personalidad. Al final se ve en esta
constelación una orientación ontológica respecto a los deberes morales correspondientes.
La naturaleza de la sexualidad pertenece a una estructura prehumana; ella
se orienta a la conservación de la especie, está polarizada hacia el sexo opuesto
pero indeterminada respecto a los individuos. En el orden de los seres sensibles
la sexualidad cobra -como per accidens- un carácter vivencial, es decir de conoscibilidad,
manifestado como placer, además del cumplimiento de su finalidad
natural. De igual modo se encuentra también la sexualidad en el hombre, pero
en él cobrará el papel que le dicta su estructura personal de hombre.
Si bien la sexualidad en cuanto tal es indeterminada respecto a los individuos,
está sin embargo muy determinada en el orden meramente categorial. La persona,
por su propia naturaleza, trasciende todo orden categorial, que no la puede satisfacer,
ni noeticamente ni en el amor como realización de la libertad. La persona
encuentra su propia plenitud en la entrega de propio yo en un tú, en último
término en el Tú infinito de Dios. La realización personal -por el amor- no
permite cambios de «objeto», de situaciones meramente categoriales.
Luego, el integrar la sexualidad positivamente en el hombre -tarea moral
por hacer- quiere decir: darle el carácter que le corresponde como una causa
instrumental entre muchas otras, para manifestar el amor especÃficamente hu.
mano. Resulta que la castidad es en todas sus formas la consecuencia moral
en el orden natural, que integra la sexualidad en la personalidad del hombre
In vivo myocardial tissue characterization of all four chambers using high-resolution quantitative MRI
Quantitative native T(1) Mapping of the myocardium without the application of contrast agents can be used to detect fibrosis in the left ventricle. Spatial resolution of standard native T(1) mapping is limited by cardiac motion and hence is not sufficient to resolve small myocardial structures, such as the right ventricle and the atria. Here, we present a novel MR approach which provides cardiac motion information and native T(1) maps from the same data. Motion information is utilized to optimize data selection for T(1) mapping and a model-based iterative reconstruction scheme ensures high-resolution T(1) maps for the entire heart. Feasibility of the approach was demonstrated in three healthy volunteers. In the T(1) maps, the myocardium of all four chambers can be visualized and T(1) values of the left atrium and right chambers were comparable to left ventricular T(1) values
Fast myocardial T(1) mapping using cardiac motion correction
PURPOSE: To improve the efficiency of native and postcontrast high-resolution cardiac T(1) mapping by utilizing cardiac motion correction. METHODS: Common cardiac T(1) mapping techniques only acquire data in a small part of the cardiac cycle, leading to inefficient data sampling. Here, we present an approach in which 80% of each cardiac cycle is used for T(1) mapping by integration of cardiac motion correction. Golden angle radial data was acquired continuously for 8 s with in-plane resolution of 1.3 × 1.3 mm(2). Cine images were reconstructed for nonrigid cardiac motion estimation. Images at different TIs were reconstructed from the same data, and motion correction was performed prior to T(1) mapping. Native T(1) mapping was evaluated in healthy subjects. Furthermore, the technique was applied for postcontrast T(1) mapping in 5 patients with suspected fibrosis. RESULTS: Cine images with high contrast were obtained, leading to robust cardiac motion estimation. Motion-corrected T(1) maps showed myocardial T(1) times similar to cardiac-triggered T(1) maps obtained from the same data (1288 ± 49 ms and 1259 ± 55 ms, respectively) but with a 34% improved precision (spatial variation: 57.0 ± 12.5 ms and 94.8 ± 15.4 ms, respectively, P < 0.0001) due to the increased amount of data. In postcontrast T(1) maps, focal fibrosis could be confirmed with late contrast-enhancement images. CONCLUSION: The proposed approach provides high-resolution T(1) maps within 8 s. Data acquisition efficiency for T(1) mapping was improved by a factor of 5 by integration of cardiac motion correction, resulting in precise T(1) maps
Scale Dependence of the Halo Bias in General Local-Type Non-Gaussian Models I: Analytical Predictions and Consistency Relations
We investigate the clustering of halos in cosmological models starting with
general local-type non-Gaussian primordial fluctuations. We employ multiple
Gaussian fields and add local-type non-Gaussian corrections at arbitrary order
to cover a class of models described by frequently-discussed f_nl, g_nl and
\tau_nl parameterization. We derive a general formula for the halo power
spectrum based on the peak-background split formalism. The resultant spectrum
is characterized by only two parameters responsible for the scale-dependent
bias at large scale arising from the primordial non-Gaussianities in addition
to the Gaussian bias factor. We introduce a new inequality for testing
non-Gaussianities originating from multi fields, which is directly accessible
from the observed power spectrum. We show that this inequality is a
generalization of the Suyama-Yamaguchi inequality between f_nl and \tau_nl to
the primordial non-Gaussianities at arbitrary order. We also show that the
amplitude of the scale-dependent bias is useful to distinguish the simplest
quadratic non-Gaussianities (i.e., f_nl-type) from higher-order ones (g_nl and
higher), if one measures it from multiple species of galaxies or clusters of
galaxies. We discuss the validity and limitations of our analytic results by
comparison with numerical simulations in an accompanying paper.Comment: 25 pages, 3 figures, typo corrected, Appendix C updated, submitted to
JCA
Prevalence of Giardia intestinalis Infection in Schistosomiasis-Endemic Areas in South-Central Mali
Intestinal parasite infections are frequent causes of diarrhea and malnutrition among children in the tropics. Transmission of helminths and intestinal protozoa is intimately connected with conditions of poverty, including inadequate sanitation and hygiene. Concurrent infections with several intestinal pathogens may lead to excess morbidity. Yet, there is a paucity of epidemiological data from Mali. In this study, stool samples from 56 individuals, aged 2–63 years, from Bamako and Niono, south-central Mali were examined for intestinal parasites using stool microscopy. Additionally, stool samples were subjected to a rapid diagnostic test (RDT) and polymerase chain reaction (PCR) for the detection of Cryptosporidium spp. and Giardia intestinalis. The predominant pathogens were Schistosoma mansoni and G. intestinalis with prevalences of 41% and 38%, respectively. Hymenolepis nana was detected in 4% of the participants, while no eggs of soil-transmitted helminths were found. Concurrent infections with G. intestinalis and S. mansoni were diagnosed in 16% of the participants. For the detection of G. intestinalis, PCR was more sensitive (100%) than RDT (62%) and microscopy (48%). As helminth-protozoa coinfections might have important implications for morbidity control programs, future studies should employ diagnostic tools beyond stool microscopy to accurately assess the co-endemicity of giardiasis and schistosomiasis
Realistic description of electron-energy loss spectroscopy for One-Dimensional SrCuO
We investigate the electron-energy loss spectrum of one-dimensional undoped
CuO chains within an extended multi-band Hubbard model and an extended
one-band Hubbard model, using the standard Lanczos algorithm. Short-range
intersite Coulomb interactions are explicitly included in these models, and
long-range interactions are treated in random-phase approximation. The results
for the multi-band model with standard parameter values agree very well with
experimental spectra of SrCuO. In particular, the width of the main
structure is correctly reproduced for all values of momentum transfer. It is
shown for both models that intersite Coulomb interactions mainly lead to an
energy shift of the spectra. We find no evidence for enhanced intersite
interactions in SrCuO.Comment: 4 pages, 4 figure
Increased yield stability of field-grown winter barley (Hordeum vulgare L.) varietal mixtures through ecological processes
Crop variety mixtures have the potential to increase yield stability in highly variable and unpredictable environments, yet knowledge of the specific mechanisms underlying enhanced yield stability has been limited. Ecological processes in genetically diverse crops were investigated by conducting field trials with winter barley varieties (Hordeum vulgare), grown as monocultures or as three-way mixtures in fungicide treated and untreated plots at three sites. Mixtures achieved yields comparable to the best performing monocultures whilst enhancing yield stability despite being subject to multiple predicted and unpredicted abiotic and biotic stresses including brown rust (Puccinia hordei) and lodging. There was compensation through competitive release because the most competitive variety overyielded in mixtures thereby compensating for less competitive varieties. Facilitation was also identified as an important ecological process within mixtures by reducing lodging. This study indicates that crop varietal mixtures have the capacity to stabilise productivity even when environmental conditions and stresses are not predicted in advance. Varietal mixtures provide a means of increasing crop genetic diversity without the need for extensive breeding efforts. They may confer enhanced resilience to environmental stresses and thus be a desirable component of future cropping systems for sustainable arable farming
Large non-Gaussian Halo Bias from Single Field Inflation
We calculate Large Scale Structure observables for non-Gaussianity arising
from non-Bunch-Davies initial states in single field inflation. These scenarios
can have substantial primordial non-Gaussianity from squeezed (but observable)
momentum configurations. They generate a term in the halo bias that may be more
strongly scale-dependent than the contribution from the local ansatz. We also
discuss theoretical considerations required to generate an observable
signature.Comment: 30 pages, 14 figures, typos corrected and minor changes to match
published version JCAP09(2012)00
- …