543 research outputs found
Welche landwirtschaftlichen Anbausysteme fördern das Bodenleben?
In einem weltweit einmaligen Langzeit-Feldexperiment in der Nähe von Basel werden seit 1978 biologische und konventionelle Anbauweisen in einer 7-jährigen Fruchtfolge miteinander verglichen. Die Landbausysteme wirken sich unterschiedlich auf das Bodenleben aus. Vor allem die biologischen Verfahren fördern die Menge, die Aktivität und die Diversität von Bodenlebewesen. Mit der Entwicklung neuer Methoden sind weitere Erkenntnisgewinne möglich geworden
The influence of linguistic factors on different measures of math achievement in first graders
Therapieversuch der erektilen Dysfunktion mit oraler Medikation bei selektionierten Patienten
Psychotherapeutic practice in paediatric oncology: four examples
Psychotherapy, often used with children treated for a solid tumour, is seldom described. We present four examples of such therapies: a mother who refused enucleation for her 7-month-old boy; a boy's jealousy towards his sister who was being treated for a brain tumour; a teenager troubled by his scar; a 7-year-old boy embarrassed by the unconscious memory of his treatment when he was 5 months old. All names have been changed, for reasons of privacy. Psychotherapies aim to help children and parents to cope with the violent experience of having cancer, to recover their freedom of thought and decision-making concerning their life, their place in the family, their body image, their self-esteem, their identity. These descriptions of brief psychotherapy could help paediatricians to gain a more thorough understanding of the child's experience, to improve collaboration with psychotherapists and to confront clinical skills of psychotherapists. © 2000 Cancer Research Campaig
Physiological modeling of isoprene dynamics in exhaled breath
Human breath contains a myriad of endogenous volatile organic compounds
(VOCs) which are reflective of ongoing metabolic or physiological processes.
While research into the diagnostic potential and general medical relevance of
these trace gases is conducted on a considerable scale, little focus has been
given so far to a sound analysis of the quantitative relationships between
breath levels and the underlying systemic concentrations. This paper is devoted
to a thorough modeling study of the end-tidal breath dynamics associated with
isoprene, which serves as a paradigmatic example for the class of low-soluble,
blood-borne VOCs.
Real-time measurements of exhaled breath under an ergometer challenge reveal
characteristic changes of isoprene output in response to variations in
ventilation and perfusion. Here, a valid compartmental description of these
profiles is developed. By comparison with experimental data it is inferred that
the major part of breath isoprene variability during exercise conditions can be
attributed to an increased fractional perfusion of potential storage and
production sites, leading to higher levels of mixed venous blood concentrations
at the onset of physical activity. In this context, various lines of supportive
evidence for an extrahepatic tissue source of isoprene are presented.
Our model is a first step towards new guidelines for the breath gas analysis
of isoprene and is expected to aid further investigations regarding the
exhalation, storage, transport and biotransformation processes associated with
this important compound.Comment: 14 page
Single Impurity Effects in Multiband Superconductors with Different Sign Order Parameters
A single impurity problem is investigated for multiband s-wave
superconductors with different sign order parameters (+-s-wave superconductors)
suggested in Fe-pnictide superconductors. Not only intraband but also interband
scattering is considered at the impurity. The latter gives rise to
impurity-induced local boundstates close to the impurity. We present an exact
form of the energy of the local boundstates as a function of strength of the
two types of impurity scattering. The essential role of the impurity is
unchanged in finite number of impurities. The main conclusions for a single
impurity problem help us understand effects of dense impurities in the +-s-wave
superconductors. Local density of states around the single impurity is also
investigated. We suggest impurity site nuclear magnetic resonance as a suitable
experiment to probe the local boundstates that is peculiar to the +-s-wave
state. We find that the +-s-wave model is mapped to a chiral dx2-y2+-idxy-wave,
reflecting the unconventional nature of the sign reversing order parameter. For
a quantum magnetic impurity, interband scattering destabilizes the Kondo
singlet.Comment: 23 pages, 7 figures, to be published in J. Phys. Soc. Jpn. (2009) No.
Species by Environment Interactions Affect Pyrrolizidine Alkaloid Expression in Senecio jacobaea, Senecio aquaticus, and Their Hybrids
We examined the effects of water and nutrient availability on the expression of the defense pyrrolizidine alkaloids (PAs) in Senecio jacobaea and S. aquaticus. Senecio jacobaea, and S. aquaticus are adapted to different natural habitats, characterized by differing abiotic conditions and different selection pressures from natural enemies. We tested if PA concentration and diversity are plastic over a range of water and nutrient treatments, and also whether such plasticity is dependent on plant species. We also tested the hypothesis that hybridization may contribute to PA diversity within plants, by comparing PA expression in parental species to that in artificially generated F1 hybrids, and also in later generation natural hybrids between S. jacobaea and S. aquaticus. We showed that total PA concentration in roots and shoots is not dependent on species, but that species determines the pattern of PA diversification. Pyrrolizidine alkaloid diversity and concentration are both dependent on environmental factors. Hybrids produce a putatively novel PA, and this PA is conserved in natural hybrids, that are backcrossed to S. jacobaea. Natural hybrids that are backcrossed several times to S. jacobaea are with regard to PA diversity significantly different from S. jacobaea but not from S. aquaticus, while F1 hybrids are in all cases more similar to S. jacobaea. These results collectively suggest that PA diversity is under the influence of natural selection
Incidence of postoperative nausea and vomiting and associated factors in Hospital Universitario San Ignacio
Introducción: A pesar de los adelantos en la anestesiología actual, aún continúan presentándosenáuseas y vómito en el postoperatorio (NVPO) como una de las complicacionesmás frecuentes con una incidencia que oscila entre el 4,6 % y el 49,0 %. Objetivos:Describir la incidencia de náuseas y vómitos en el postoperatorio, e identificar posiblesfactores de riesgo y el tratamiento utilizado. Material y métodos: Se diseñó un estudioobservacional, para lo cual se recolectó información de 1191 pacientes mayores de 15años de edad, programados para procedimientos electivos. Resultados: La incidenciade NVPO encontrada fue del 8,1 %, (7,8 % para náuseas y 3,6 % para vómito) y supresentación se relacionó especialmente con el sexo femenino, cirugía laparoscópica ytiempo de anestesia mayor de 180 minutos.Artículo original11-21Introduction
: Despite the current advances in
anesthesiology, nausea and vomiting in post-
operative (PONV) is one of the most common
complications with an incidence between 4.6
and 49.0%.
Objectives
: To describe the inci
-
dence of nausea and vomiting after surgery, and
identify potential risk factors and the treatment
used.
Methods:
An observational study, with
1191 patients over 15 years of age was collected,
scheduled for elective procedures.
Results:
The
incidence of PONV was 8.1% (7.8% to 3.6%
for nausea and vomiting) and its presentation is
particularly associated with female sex, laparoscopic surgery and anesthesia time greater than
180 minute
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