138 research outputs found
Analysis and test of the central-blue-spot infall hallmark
The infall of material onto a protostar, in the case of optically thick line
emission, produces an asymmetry in the blue- and red-wing line emission. For an
angularly resolved emission, this translates in a blue central spot in the
first-order moment (intensity weighted velocity) map. An analytical expression
for the first-order moment intensity as a function of the projected distance
was derived, for the cases of infinite and finite infall radius. The effect of
a finite angular resolution, which requires the numerical convolution with the
beam, was also studied. This method was applied to existing data of several
star-forming regions, namely G31.41+0.31 HMC, B335, and LDN 1287, obtaining
good fits to the first-order moment intensity maps, and deriving values of the
central masses onto which the infall is taking place (G31.41+0.31 HMC: 70-120
; B335: 0.1 ; Guitar Core of LDN 1287: 4.8 ). The
central-blue-spot infall hallmark appears to be a robust and reliable indicator
of infall.Comment: Accepted for publication in A&
2015 Seychelles global school-based student health survey
Introduction : Risky behaviors in schoolâaged children, such as unhealthy dietary patterns, lack of physical activity, cigarette smoking, alcohol and substance use, sexual behavior, can impact their health in the short and long terms. This survey aimed to assess the prevalence of selected risk behaviors and protective factors in students aged 13â15 years.
Methods: The Global Schoolâbased Student Health Survey (GSHS) was conducted in September 2015 in Seychelles. Methods followed the standard methodology of GSHS developed by the World Health Organization, the Centers of Disease Prevention and Control (Atlanta, USA) and other international agencies. A twoâstage cluster sample was used to include a random sample of students in grades S1 to S5, i.e. students aged 11 to 17 years. Students completed a self reported questionnaire, which was anonymous, which included questions from several standard modules of GSHS. In addition, weight and height was measured on the day before the survey and students were asked to report their results in their anonymous response forms
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Bioinspired snapping-claw apparatus to study hydrodynamic cavitation effects on the corrosion of metallic samples
A creative low-cost and compact mechanical device that mimics the rapid closure of the pistol shrimp claw was used to conduct electrochemical experiments, in order to study the effects of hydrodynamic cavitation on the corrosion of aluminum and steel samples. Current-time curves show significant changes associated with local variations in dissolved O2 concentration, cavitation-induced erosion and changes in the nature of the surface corrosion products
2015 Seychelles Global Youth Tobacco Survey and comparison with GYTS in 2007 and 2002
OBJECTIVES: The Global Youth Tobacco Survey (GYTS) is aimed to assess behaviors, knowledge, beliefs, opinions and other variables related to tobacco use among students of secondary schools aged 13â15 years in countries worldwide using a standard methodology and questionnaire.
METHODS: We present the main findings of GYTS performed in Seychelles in 2015 and compare results with results of two previous GYTS surveys done in Seychelles in 2007 and 2002 in order to identify trends over time. In each GYTS, a twoâstage cluster sample design was used to produce a representative sample of all students in grades S1, S2, S3, S4 and S5 from all public and private schools in Seychelles. Participants completed a standard selfâadministered questionnaire in schools on an anonymous and voluntary basis
Perbandingan Pengaruh Latihan Menggiring Bola Antar Bidang dengan Latihan Lomba Slalom Menggiring Bola terhadap Keterampilan Menggiring Bola dalam Permainan Sepak Bola pada Ssb Junior Pekanbaru
, Form reseath was conducted to determine whether there is influence between the dribble exercise field with a slalom race on dribbling skills on SSB Junior Pekanbaru. reseath residents are athletes SSB Junior Pekanbaru. Athletes in this reseath is 18 people. Instrument in this research aims to improve the skills of dribbling. Then the data is processed with statistics, normality test with Liliefors test at a significant level α = 0.05. Based on the analysis of the initial test data, then the effects of exercise across the field to dribble dribbling skills on SSB Junior Pekanbaru show the results as follows: a score of 19.54 seconds the fastest and slowest score was 23.5 seconds, with an average of 21.004. And a standard deviation of 1.161. Based on the frequency distribution table Rabel 1 of 9 samples turned out to be as much as 2 people (22.22%) with the interval from 19.54 to 20.44 range. Then 4 people (44.44%) with the interval ranges from 20.45 to 21.35, while one person (11.11%) with the interval ranges from 22.27 to 23.17. Of calculation has been done shows that the practice dribbling between the field and practice dribbling slalom race together showed an increase in the skills of dribbling, this means that the profits after menggring exercises and drills the ball across the field of competition slalom dribble that as the increase dribbling skills
El cobre como aditivo en dietas para cerdos altas en fibras o en melaza
Para estudiar el efecto de promociĂłn del crecimiento por el cobre (Cu de CuSO45.H20, 1kg/t), ante el uso de niveles altos de fibra o de melaza se realizaron cuatro experimentos involucrados 142 cerdos en crecimiento-finalizaciĂłn
Cryptic Diversity in Paramecium multimicronucleatum Revealed with a Polyphasic Approach
Paramecium (Ciliophora) systematics is well studied, and about twenty morphological species have been described. The morphological species may include several genetic species. How-ever, molecular phylogenetic analyses revealed that the species diversity within Paramecium could be even higher and has raised a problem of cryptic species whose statuses remain uncertain. In the present study, we provide the morphological and molecular characterization of two novel Paramecium species. While Paramecium lynni n. sp., although morphologically similar to P. multimicronucleatum, is phylogenetically well separated from all other Paramecium species, Paramecium fokini n. sp. appears to be a cryptic sister species to P. multimicronucleatum. The latter two species can be distinguished only by molecular methods. The number and structure of micronuclei, traditionally utilized to discriminate species in Paramecium, vary not only between but also within each of the three studied species and, thus, cannot be considered a reliable feature for species identification. The geographic distribution of the P. multimicronucleatum and P. fokini n. sp. strains do not show defined patterns, still leaving space for a role of the geographic factor in initial speciation in Paramecium. Future findings of new Paramecium species can be predicted from the molecular data, while morphological characteristics appear to be unstable and overlapping at least in some species
Strong Lensing Analysis of A1689 from Deep Advanced Camera Images
We analyse deep multi-colour Advanced Camera images of the largest known
gravitational lens, A1689. Radial and tangential arcs delineate the critical
curves in unprecedented detail and many small counter-images are found near the
center of mass. We construct a flexible light deflection field to predict the
appearance and positions of counter-images. The model is refined as new
counter-images are identified and incorporated to improve the model, yielding a
total of 106 images of 30 multiply lensed background galaxies, spanning a wide
redshift range, 1.0z5.5. The resulting mass map is more circular in
projection than the clumpy distribution of cluster galaxies and the light is
more concentrated than the mass within . The projected mass profile
flattens steadily towards the center with a shallow mean slope of
, over the observed range,
r, matching well an NFW profile, but with a relatively high
concentration, . A softened isothermal profile
(\arcs) is not conclusively excluded, illustrating that
lensing constrains only projected quantities. Regarding cosmology, we clearly
detect the purely geometric increase of bend-angles with redshift. The
dependence on the cosmological parameters is weak due to the proximity of
A1689, , constraining the locus, .
This consistency with standard cosmology provides independent support for our
model, because the redshift information is not required to derive an accurate
mass map. Similarly, the relative fluxes of the multiple images are reproduced
well by our best fitting lens model.Comment: Accepted by ApJ. For high quality figures see
http://wise-obs.tau.ac.il/~kerens/A168
SURF1 deficiency causes demyelinating Charcot-Marie-Tooth disease
Objective: To investigate whether mutations in the SURF1 gene are a cause of Charcot-Marie-Tooth (CMT) disease. Methods: We describe 2 patients from a consanguineous family with demyelinating autosomal recessive CMT disease (CMT4) associated with the homozygous splice site mutation c.107-2A>G in the SURF1 gene, encoding an assembly factor of the mitochondrial respiratory chain complex IV. This observation led us to hypothesize that mutations in SURF1 might be an unrecognized cause of CMT4, and we investigated SURF1 in a total of 40 unrelated patients with CMT4 after exclusion of mutations in known CMT4 genes. The functional impact of c.107-2A>G on splicing, amount of SURF1 protein, and on complex IV activity and assembly was analyzed. Results: Another patient with CMT4 was found to harbor 2 additional SURF1 mutations. All 3 patients with SURF1-associated CMT4 presented with severe childhood-onset neuropathy, motor nerve conduction velocities G mutation produced no normally spliced transcript, leading to SURF1 absence. However, complex IV remained partially functional in muscle and fibroblasts. Conclusions: We found SURF1 mutations in 5% of families (2/41) presenting with CMT4. SURF1 should be systematically screened in patients with childhood-onset severe demyelinating neuropathy and additional features such as lactic acidosis, brain MRI abnormalities, and cerebellar ataxia developing years after polyneuropathy
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