562 research outputs found
Relaciones entre el autoconcepto y el perfil psicológico deportivo en triatletas
El propósito de este trabajo fue examinar las relaciones entreel autoconcepto multidimensional y el perfil psicológico en un grupo detriatletas. Participaron en el estudio 88 triatletas con edades entre 20 y 55años (M= 36.06; DT= 7.75). Se utilizó el Cuestionario Autoconcepto Forma5 (AF5) para evaluar el autoconcepto y el Inventario Psicológico deEjecución Deportiva (IPED) para analizar el perfil psicológico. Los análisisde correlación efectuados pusieron de manifiesto relaciones significativasentre los constructos estudiados, siendo el autoconcepto emocional el quetuvo una mayor correlación con los diferentes factores del perfil psicológico.Además, la autoconfianza, el control de afrontamiento negativo y el controlactitudinal fueron las dimensiones del IPED que obtuvieron un mejor valorde predicción a partir de los diferentes factores del autoconcepto. Losresultados hallados pusieron de manifiesto la importancia del autoconceptoen la configuración de las diversas habilidades psicológicas implicadas en elrendimiento del deportista
Counting BPS states on the Enriques Calabi-Yau
We study topological string amplitudes for the FHSV model using various
techniques. This model has a type II realization involving a Calabi-Yau
threefold with Enriques fibres, which we call the Enriques Calabi-Yau. By
applying heterotic/type IIA duality, we compute the topological amplitudes in
the fibre to all genera. It turns out that there are two different ways to do
the computation that lead to topological couplings with different BPS content.
One of them leads to the standard D0-D2 counting amplitudes, and from the other
one we obtain information about bound states of D0-D4-D2 branes on the Enriques
fibre. We also study the model using mirror symmetry and the holomorphic
anomaly equations. We verify in this way the heterotic results for the D0-D2
generating functional for low genera and find closed expressions for the
topological amplitudes on the total space in terms of modular forms, and up to
genus four. This model turns out to be much simpler than the generic B-model
and might be exactly solvable.Comment: 62 pages, v3: some results at genus 3 corrected, more typos correcte
Differential Protein Contents in Two Members of the White fly Bemisia tabaci(Hemiptera:Aleurodidae)Complex:Reproductive and Invasive Implications
Abstract: Although the displacement of some native whitefly species by he B biotype of Bemisia tabaci ha been noted in China, it is still unclear physiological and molecular mechanisms predominate during such invasions. Here, we investigated proteome varialibility in both B biotype and the native ZHJI haplotype.ZHJI eggs showed larger numbers of specific proteins than B eggs. A set of proteins found in B eggs were present at higher levels in ZHJI.Three ZHJI egg proteins were present at higher levels in B eggs. ZHJI males possessed four specific proteins, and at least five other male proteins were shared by two whiteflies.Two proteins identified in ZHJI males were present at higher levels in B males. Three other shared male proteins weere found at much higher levels in ZHJI than in the B biotype. Both ZHJI and B expressed three specific female proteins. Most of the female proteins identified in ZHJI were present at much higher levels in B. In conclusion, protein content indexed by electrophoretic profiling has likely played an important role during the displacement of natives by the B biotype
Exposure of a Dengue Vector to Tea and Its Waste: Survival, Developmental Consequences, and Significance for Pest Management
Dengue mosquitoes are evolving into a broader global public health menace, with relentless outbreaks and the rise
in number of Zika virus disease cases as reminders of the continued hazard associated with Aedes vectors. The use of chemical
insecticidesthe principal strategy against mosquito vectorshas been greatly impeded due to the development of insecticide
resistance and the shrinking spectrum of effective agents. Therefore, there is a pressing need for new chemistries for vector
control. Tea contains hundreds of chemicals, and its waste, which has become a growing global environmental problem, is almost
as rich in toxicants as green leaves. This paper presents the toxic and sublethal effects of different crude extracts of tea on Aedes
albopictus. The survival rates of larvae exposed to tea extracts, especially fresh tea extract (FTE), were markedly lower than those
in the control treatment group. In addition to this immediate toxicity against different developmental stages, the extracts tested
caused a broad range of sublethal effects. The developmental time was clearly longer in containers with tea, especially in those
with young larvae (YL) and FTE. Among the survivors, pupation success was reduced in containers with tea, which also
produced low adult emergence rates with increasing tea concentration. The production of eggs tended to be reduced in females
derived from the tea treatment groups. These indirect effects of tea extracts on Ae. albopictus exhibited different patterns
according to the exposed larval stage. Taken together, these findings indicate that tea and its waste affect most key components of
Ae. albopictus vectorial capacity and may be useful for dengue control. Reusing tea waste in vector control could also be a practical
solution to the problems associated with its pollution
Differential Protein Contents in Two Members of the Whitefly Bemisia tabaci (Hemiptera: Aleurodidae) Complex: Reproductive and Invasive Implications
Although the displacement of some native whitefly species by the B biotype of Bemisia tabaci has been noted in China, it is still unclear which physiological and molecular mechanisms predominate during such invasions. Here, we investigated proteome variability in both B biotype and the native ZHJ1 haplotype. ZHJ1 eggs showed larger numbers of specific proteins than B eggs. A set of proteins found in B eggs were present at higher levels in ZHJ1. Three ZHJ1 egg proteins were present at higher levels in B eggs. ZHJ1 males
possessed four specific proteins, and at least five other male proteins were shared by the two whiteflies. Two
proteins identified in ZHJ1 males were present at higher levels in B males. Three other shared male proteins
were found at much higher levels in ZHJ1 than in the B biotype. Both ZHJ1 and B expressed three specific
female proteins. Most of the female proteins identified in ZHJ1 were present at much higher levels in B. In conclusion, protein content indexed by electrophoretic profiling has likely played an important role during the displacement of natives by the B biotype
Incydenty sercowo-naczyniowe u pacjentów stosujących sildenafil - wyniki badania International Men’s Health Study
Wstęp: Celem pracy było oszacowanie częstości występowania poważnych incydentów sercowo-naczyniowych (np. zawał serca, udar) oraz całkowitej śmiertelności wśród mężczyzn z zaburzeniami
erekcji otrzymujących sildenafil.
Metody: Prospektywnym, obserwacyjnym badaniem kohortowym International Men’s Health
Study (IMHS) objęto pacjentów ze zdiagnozowanymi zaburzeniami erekcji oraz wcześniej stosujących
sildenafil lub dopiero zaczynających przyjmować ten preparat. Dane wyjściowe oraz
z obserwacji odległej dotyczące chorób sercowo-naczyniowych (CVD), czynników ryzyka oraz
zaburzeń erekcji uzyskano za pomocą odpowiednich kwestionariuszy. Do osób, które przebyły
epizod sercowo-naczyniowy, wysłano kwestionariusze w celu zebrania informacji związanych
z ekspozycją na sildenafil/leczeniem zaburzeń erekcji przed incydentem. Wyniki: W analizowanej grupie (n = 3813) odnotowano 35 incydentów sercowo-naczyniowych
u 30 chorych. Częstość zgonu z jakiejkolwiek przyczyny, zawału serca oraz udaru wynosiła
odpowiednio 0,4; 0,6 i 0,1 na każdych 100 pacjentolat obserwacji. W grupie 6 mężczyzn, którzy
zgłosili stosowanie sildenafilu na miesiąc przed incydentem sercowo-naczyniowym, 2 podało
jego użycie w czasie 24 godzin poprzedzających zdarzenie.
Wnioski: Wyniki badania IMHS potwierdzają wcześniejsze doniesienia o współwystępowaniu
zaburzeń erekcji oraz CVD i o podobnych czynnikach ryzyka tych chorób
Update on the correlation of the highest energy cosmic rays with nearby extragalactic matter
Data collected by the Pierre Auger Observatory through 31 August 2007 showed
evidence for anisotropy in the arrival directions of cosmic rays above the
Greisen-Zatsepin-Kuz'min energy threshold, \nobreak{eV}. The
anisotropy was measured by the fraction of arrival directions that are less
than from the position of an active galactic nucleus within 75 Mpc
(using the V\'eron-Cetty and V\'eron catalog). An updated
measurement of this fraction is reported here using the arrival directions of
cosmic rays recorded above the same energy threshold through 31 December 2009.
The number of arrival directions has increased from 27 to 69, allowing a more
precise measurement. The correlating fraction is , compared
with expected for isotropic cosmic rays. This is down from the early
estimate of . The enlarged set of arrival directions is
examined also in relation to other populations of nearby extragalactic objects:
galaxies in the 2 Microns All Sky Survey and active galactic nuclei detected in
hard X-rays by the Swift Burst Alert Telescope. A celestial region around the
position of the radiogalaxy Cen A has the largest excess of arrival directions
relative to isotropic expectations. The 2-point autocorrelation function is
shown for the enlarged set of arrival directions and compared to the isotropic
expectation.Comment: Accepted for publication in Astroparticle Physics on 31 August 201
Atmospheric effects on extensive air showers observed with the Surface Detector of the Pierre Auger Observatory
Atmospheric parameters, such as pressure (P), temperature (T) and density,
affect the development of extensive air showers initiated by energetic cosmic
rays. We have studied the impact of atmospheric variations on extensive air
showers by means of the surface detector of the Pierre Auger Observatory. The
rate of events shows a ~10% seasonal modulation and ~2% diurnal one. We find
that the observed behaviour is explained by a model including the effects
associated with the variations of pressure and density. The former affects the
longitudinal development of air showers while the latter influences the Moliere
radius and hence the lateral distribution of the shower particles. The model is
validated with full simulations of extensive air showers using atmospheric
profiles measured at the site of the Pierre Auger Observatory.Comment: 24 pages, 9 figures, accepted for publication in Astroparticle
Physic
The exposure of the hybrid detector of the Pierre Auger Observatory
The Pierre Auger Observatory is a detector for ultra-high energy cosmic rays.
It consists of a surface array to measure secondary particles at ground level
and a fluorescence detector to measure the development of air showers in the
atmosphere above the array. The "hybrid" detection mode combines the
information from the two subsystems. We describe the determination of the
hybrid exposure for events observed by the fluorescence telescopes in
coincidence with at least one water-Cherenkov detector of the surface array. A
detailed knowledge of the time dependence of the detection operations is
crucial for an accurate evaluation of the exposure. We discuss the relevance of
monitoring data collected during operations, such as the status of the
fluorescence detector, background light and atmospheric conditions, that are
used in both simulation and reconstruction.Comment: Paper accepted by Astroparticle Physic
The Fluorescence Detector of the Pierre Auger Observatory
The Pierre Auger Observatory is a hybrid detector for ultra-high energy
cosmic rays. It combines a surface array to measure secondary particles at
ground level together with a fluorescence detector to measure the development
of air showers in the atmosphere above the array. The fluorescence detector
comprises 24 large telescopes specialized for measuring the nitrogen
fluorescence caused by charged particles of cosmic ray air showers. In this
paper we describe the components of the fluorescence detector including its
optical system, the design of the camera, the electronics, and the systems for
relative and absolute calibration. We also discuss the operation and the
monitoring of the detector. Finally, we evaluate the detector performance and
precision of shower reconstructions.Comment: 53 pages. Submitted to Nuclear Instruments and Methods in Physics
Research Section
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