2,283 research outputs found
A case of vulval schistosomiasis
While schistosomiasis is endemic in South Africa, cutaneous manifestations are relatively uncommon. This case report describes the clinical findings in a patient with vulval schistosomiasis. Schistosomiasis should be considered in the differential diagnosis of genital lesions in residents in endemic areas or visitors to these areas.South African Family Practice Vol. 49 (9) 2007: pp. 42-4
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The Nature and Purpose of Acute Psychiatric Wards: The Tompkins Acute Ward Study
Background:âAcute inpatient care in the UK is being subjected to increasing critical scrutiny, highlighting concerns about content and quality. There is an absence of clarity and consensus on what acute inpatient care is for, adding to difficulties in developing this service sector.
Aim:âTo define the function of acute psychiatric wards.
Methods:âInterviews were conducted with multidisciplinary staff (13 Ward Managers, 14 F Grade nurses, 11 Occupational Therapists and 9 Consultant Psychiatrists), on rationales for admission, their care and treatment philosophy, and the roles of different professionals.
Results:âPatients are admitted because they appear likely to harm themselves or others, and because they are suffering from a severe mental illness, and/or because they or their family/community require respite, and/or because they have insufficient support and supervision available to them in the community. The tasks of acute inpatient care are to keep patients safe, assess their problems, treat their mental illness, meet their basic care needs and provide physical healthcare. These tasks are completed via containment, 24-hour staff presence, treatment provision, and complex organisation and management.
Conclusions:âProfessional education, audit, research and the structuring of services all need to be oriented towards these tasks.
Declaration of interest:âThis study was funded by the Tompkins Foundation and the Department of Health Nursing Quality initiative
Modeling of mode-locking in a laser with spatially separate gain media
We present a novel laser mode-locking scheme and discuss its unusual
properties and feasibility using a theoretical model. A large set of
single-frequency continuous-wave lasers oscillate by amplification in spatially
separated gain media. They are mutually phase-locked by nonlinear feedback from
a common saturable absorber. As a result, ultra short pulses are generated. The
new scheme offers three significant benefits: the light that is amplified in
each medium is continuous wave, thereby avoiding issues related to group
velocity dispersion and nonlinear effects that can perturb the pulse shape. The
set of frequencies on which the laser oscillates, and therefore the pulse
repetition rate, is controlled by the geometry of resonator-internal optical
elements, not by the cavity length. Finally, the bandwidth of the laser can be
controlled by switching gain modules on and off. This scheme offers a route to
mode-locked lasers with high average output power, repetition rates that can be
scaled into the THz range, and a bandwidth that can be dynamically controlled.
The approach is particularly suited for implementation using semiconductor
diode laser arrays.Comment: 13 pages, 5 figures, submitted to Optics Expres
Atividade da enzima fosfatase ĂĄcida em diferentes manejos de solo na regiĂŁo oeste do ParanĂĄ.
Editado por Arnaldo Colozzi Filho, JoĂŁo Henrique Caviglione, Graziela Moraes de Cesare Barbosa, Luciano Grillo Gil, Tiago Santos Telles
Intersublevel Polaron Dephasing in Self-Assembled Quantum Dots
Polaron dephasing processes are investigated in InAs/GaAs dots using
far-infrared transient four wave mixing (FWM) spectroscopy. We observe an
oscillatory behaviour in the FWM signal shortly (< 5 ps) after resonant
excitation of the lowest energy conduction band transition due to coherent
acoustic phonon generation. The subsequent single exponential decay yields long
intraband dephasing times of 90 ps. We find excellent agreement between our
measured and calculated FWM dynamics, and show that both real and virtual
acoustic phonon processes are necessary to explain the temperature dependence
of the polarization decay.Comment: 10 pages, 4 figures, submitted to Phys Rev Let
Primary breast cancer stem-like cells metastasise to bone, switch phenotype and acquire a bone tropism signature
Overview of the Far Ultraviolet Spectroscopic Explorer Mission
The Far Ultraviolet Spectroscopic Explorer satellite observes light in the
far-ultraviolet spectral region, 905 - 1187 A with high spectral resolution.
The instrument consists of four coaligned prime-focus telescopes and Rowland
spectrographs with microchannel plate detectors. Two of the telescope channels
use Al:LiF coatings for optimum reflectivity from approximately 1000 to 1187 A
and the other two use SiC coatings for optimized throughput between 905 and
1105 A. The gratings are holographically ruled to largely correct for
astigmatism and to minimize scattered light. The microchannel plate detectors
have KBr photocathodes and use photon counting to achieve good quantum
efficiency with low background signal. The sensitivity is sufficient to examine
reddened lines of sight within the Milky Way as well as active galactic nuclei
and QSOs for absorption line studies of both Milky Way and extra-galactic gas
clouds. This spectral region contains a number of key scientific diagnostics,
including O VI, H I, D I and the strong electronic transitions of H2 and HD.Comment: To appear in FUSE special issue of the Astrophysical Journal Letters.
6 pages + 4 figure
Supersymmetric D-branes and calibrations on general N=1 backgrounds
We study the conditions to have supersymmetric D-branes on general {\cal N}=1
backgrounds with Ramond-Ramond fluxes. These conditions can be written in terms
of the two pure spinors associated to the SU(3)\times SU(3) structure on
T_M\oplus T^\star_M, and can be split into two parts each involving a different
pure spinor. The first involves the integrable pure spinor and requires the
D-brane to wrap a generalised complex submanifold with respect to the
generalised complex structure associated to it. The second contains the
non-integrable pure spinor and is related to the stability of the brane. The
two conditions can be rephrased as a generalised calibration condition for the
brane. The results preserve the generalised mirror symmetry relating the type
IIA and IIB backgrounds considered, giving further evidence for this duality.Comment: 23 pages. Some improvements and clarifications, typos corrected and
references added. v3: Version published in JHE
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