2,146 research outputs found
Effect on hatchability of length of time for turning eggs during the incubation in Red-legged partridge (Alectoris rufa)
El volteo de los huevos en la incubación artificial es clave para lograr buenas tasas de eclosión y pollos
viables. En la producción de perdiz roja (Alectoris rufa) la duración recomendada para el periodo
durante el que los huevos deben ser volteados en la incubación no se ha comprobado experimentalmente.
Para contribuir al conocimiento de la duración óptima del periodo de volteo, se incubaron 74
huevos divididos en tres grupos: huevos volteados hasta el día 18 ó 19, volteados hasta el día 20 ó 21
y volteados hasta el día 22 de incubación. La tasa de eclosión fue mayor en los huevos volteados
durante 20 días o másTurning of the eggs during the artificial incubation is critical in order to obtain a good hatchability
and viable one-day-old chicks. In Red-legged partridge (Alectoris rufa) farming, the recommended
length of time during which the eggs should be turned along the incubation process has not been
experimentally tested. With the aim of improving knowledge on the optimum length of time for the
eggs to be turned during the incubation, seventy four eggs were incubated, divided into three
groups: eggs that were turned until day 18 or 19, eggs that were turned until day 20 or 21, and eggs
that were turned until day 22 of incubation. The hatchability of the eggs was higher for the eggs that
were turned during the incubation over at least 20 days
Urohidrosis as an overlooked cooling mechanism in long-legged birds
Behavioural thermoregulation could buffer the impacts of climate warming on vertebrates.
Specifically, the wetting of body surfaces and the resulting evaporation of body fluids serves as a
cooling mechanism in a number of vertebrates coping with heat. Storks (Ciconiidae) frequently excrete
onto their legs to prevent overheating, a phenomenon known as urohidrosis. Despite the increasingly
recognised role of bare and highly vascularised body parts in heat exchange, the ecological and
evolutionary determinants of urohidrosis have been largely ignored. We combine urohidrosis data
from a scientifically curated media repository with microclimate and ecological data to investigate
the determinants of urohidrosis in all extant stork species. Our phylogenetic generalised linear mixed
models show that high temperature, humidity and solar radiation, and low wind speed, promote
the use of urohidrosis across species. Moreover, species that typically forage in open landscapes
exhibit a more pronounced use of urohidrosis than those mainly foraging in waterbodies. Substantial
interspecific variation in temperature thresholds for urohidrosis prevalence points to different species
vulnerabilities to high temperatures. This integrated approach that uses online data sources and
methods to model microclimates should provide insight into animal thermoregulation and improve
our capacity to make accurate predictions of climate change’s impact on biodiversityinfo:eu-repo/semantics/publishedVersio
La estación de radiación solar e iluminación de alta calidad del IDMP en Madrid y su aplicación a la edificación
En este trabajo se presenta un estudio de la actividad investigadora que se ha realizado hasta el momento en la estación de radiación solar e iluminación de alta calidad del International Daylight Measurement Program (IDMP) en Madrid ubicada en la E. T. S. de Arquitectura de la Universidad Politécnica de Madrid (40º 25’ N, 3º 41’ W). Esta estación ha centrado su investigación fundamental en dos temas: luminancias y eficacias luminosas de la radiación solar (global, difusa y directa) para todo tipo de cielos, todo ello desde un punto de vista físico, cuyos trabajos y resultados se exponen con detalle. La finalidad de este estudio es poder aplicar los resultados obtenidos a la Edificación, tanto en edificios ya existentes como de nueva construcción, para obtener un máximo confort visual a partir de la iluminación natural, con el consiguiente ahorro energétic
Body composition and somatotype in professional men's handball according to playing positions
Se realizó un estudio descriptivo transversal en 19 jugadores profesionales
del Club Balonmano Valladolid. Las mediciones antropométricas fueron
realizadas según el protocolo estándar. Se estimaron la masa grasa y ósea, se
calculó el somatotipo y se analizaron las diferencias entre las variables en
función de la posición.
Como resultados, se obtuvo que los pivotes fueron los jugadores más
pesados (con mayor porcentaje de masa grasa); los extremos, los más ligeros y
los laterales, junto con los pivotes, los más altos. No se observaron diferencias
en el IMC en los grupos. En la somatocarta los centrales y laterales se situaron
en la zona central; los extremos y los pivotes en la endomorfa-mesomorfa y los
porteros en la ecto-endomorfa.
Así se evidenció que las variables antropométricas, los datos de
composición corporal y la somatocarta de los deportistas confirman las
características morfológicas básicas de los jugadores para la posición para la
que son más aptosA cross-sectional descriptive study was accomplished in 19 professional players
from Valladolid Handball Club. Anthropometric measurements were performed
according to standard protocol. Body fat and bone mass were estimated, and
the somatotype was calculated.
As results, the line players were significantly the heaviest players; the wings
were lightest and the backs, with the line players, the tallest. Nevertheless, no
significant differences in BMI were observed. Regarding the body composition,
the line players showed the highest values of fat-mass. No differences in BMI
were observed in the groups. With respect to the somatochart, the center backs
and backs were in the central area; wings and line players showed an
endomorph-mesomorph development, and goalkeepers were in the ectoendomorph
area.
As conclusions, anthropometric variables, body composition data and the
somatochart of the athletes evaluated confirm the basic morphological
characteristics of the players for the position for which they are best suite
Resolvin D2 Attenuates Cardiovascular Damage in Angiotensin II-Induced Hypertension.
Background:
Resolution of inflammation is orchestrated by specialized proresolving lipid mediators (SPMs), and this would be impaired in some cardiovascular diseases. Among SPMs, resolvins (Rv) have beneficial effects in cardiovascular pathologies, but little is known about their effect on cardiovascular damage in hypertension.
Methods:
Aorta, small mesenteric arteries, heart, and peritoneal macrophages were taken from C57BL/6J mice, infused or not with angiotensin II (AngII; 1.44 mg/kg/day, 14 days) in presence or absence of resolvin D2 (RvD2) (100 ng/mice, every second day) starting 1 day before or 7 days after AngII infusion.
Results:
Enzymes and receptors involved in SPMs biosynthesis and signaling were increased in aorta or heart from AngII-infused mice. We also observed a differential regulation of SPMs in heart from these mice. Preventive treatment with RvD2 partially avoided AngII-induced hypertension and protected the heart and large and small vessels against functional and structural alterations induced by AngII. RvD2 increased the availability of vasoprotective factors, modified SPMs profile, decreased cardiovascular fibrosis, and increased the infiltration of pro-resolving macrophages. When administered in hypertensive animals with established cardiovascular damage, RvD2 partially improved cardiovascular function and structure, decreased fibrosis, reduced the infiltration of neutrophils, and shifted macrophage phenotype toward a pro-resolving phenotype.
Conclusions:
There is a disbalance between proinflammatory and resolution mediators in hypertension. RvD2 protects cardiovascular function and structure when administered before and after the development of hypertension by modulating vascular factors, fibrosis and inflammation. Activating resolution mechanisms by treatment with RvD2 may represent a novel therapeutic strategy for the treatment of hypertensive cardiovascular disease.pre-print362 K
Mesoscopic structure conditions the emergence of cooperation on social networks
We study the evolutionary Prisoner's Dilemma on two social networks obtained
from actual relational data. We find very different cooperation levels on each
of them that can not be easily understood in terms of global statistical
properties of both networks. We claim that the result can be understood at the
mesoscopic scale, by studying the community structure of the networks. We
explain the dependence of the cooperation level on the temptation parameter in
terms of the internal structure of the communities and their interconnections.
We then test our results on community-structured, specifically designed
artificial networks, finding perfect agreement with the observations in the
real networks. Our results support the conclusion that studies of evolutionary
games on model networks and their interpretation in terms of global properties
may not be sufficient to study specific, real social systems. In addition, the
community perspective may be helpful to interpret the origin and behavior of
existing networks as well as to design structures that show resilient
cooperative behavior.Comment: Largely improved version, includes an artificial network model that
fully confirms the explanation of the results in terms of inter- and
intra-community structur
Long-term results of breast conservation and immediate volume replacement with myocutaneous latissimus dorsi flap
<p>Abstract</p> <p>Background</p> <p>Published long-term outcomes of oncoplastic breast-conserving surgery are scarce and, specifically, aesthetic outcomes assessed with an objective method have not previously been published.</p> <p>Methods</p> <p>A cohort of 41 patients treated with a quadrantectomny and immediate reconstruction using a myocutaneous latissimus dorsi flap were analyzed and their aesthetic outcomes were evaluated objectively by BCCT.core software.</p> <p>Results</p> <p>At the end of a 58-month follow-up from the date of initial diagnosis, one patient (2.4%) developed an ipsilateral recurrence, six patients developed distant metastases and three patients died (7.3%) without ipsilateral recurrence, one of them presenting hepatic metastases at the time of the initial diagnosis. We were able to evaluate aesthetic results in 23 patients, 3 assessed as excellent, 12 good and 8 fair.</p> <p>Conclusion</p> <p>This oncoplastic volume replacement technique obtained a good local control and satisfactory and stable aesthetic results which have maintained unchanged after a long period of time.</p
Search for Neutral Higgs Bosons in Events with Multiple Bottom Quarks at the Tevatron
The combination of searches performed by the CDF and D0 collaborations at the
Fermilab Tevatron Collider for neutral Higgs bosons produced in association
with b quarks is reported. The data, corresponding to 2.6 fb-1 of integrated
luminosity at CDF and 5.2 fb-1 at D0, have been collected in final states
containing three or more b jets. Upper limits are set on the cross section
multiplied by the branching ratio varying between 44 pb and 0.7 pb in the Higgs
boson mass range 90 to 300 GeV, assuming production of a narrow scalar boson.
Significant enhancements to the production of Higgs bosons can be found in
theories beyond the standard model, for example in supersymmetry. The results
are interpreted as upper limits in the parameter space of the minimal
supersymmetric standard model in a benchmark scenario favoring this decay mode.Comment: 10 pages, 2 figure
Search for the standard model Higgs boson in the H to ZZ to 2l 2nu channel in pp collisions at sqrt(s) = 7 TeV
A search for the standard model Higgs boson in the H to ZZ to 2l 2nu decay
channel, where l = e or mu, in pp collisions at a center-of-mass energy of 7
TeV is presented. The data were collected at the LHC, with the CMS detector,
and correspond to an integrated luminosity of 4.6 inverse femtobarns. No
significant excess is observed above the background expectation, and upper
limits are set on the Higgs boson production cross section. The presence of the
standard model Higgs boson with a mass in the 270-440 GeV range is excluded at
95% confidence level.Comment: Submitted to JHE
Measurement of the t t-bar production cross section in the dilepton channel in pp collisions at sqrt(s) = 7 TeV
The t t-bar production cross section (sigma[t t-bar]) is measured in
proton-proton collisions at sqrt(s) = 7 TeV in data collected by the CMS
experiment, corresponding to an integrated luminosity of 2.3 inverse
femtobarns. The measurement is performed in events with two leptons (electrons
or muons) in the final state, at least two jets identified as jets originating
from b quarks, and the presence of an imbalance in transverse momentum. The
measured value of sigma[t t-bar] for a top-quark mass of 172.5 GeV is 161.9 +/-
2.5 (stat.) +5.1/-5.0 (syst.) +/- 3.6(lumi.) pb, consistent with the prediction
of the standard model.Comment: Replaced with published version. Included journal reference and DO
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