Phosphorus is limiting for growth of maize plants, and because of that use of fertilizers like rock phosphate has been proposed. However, direct use of rock phosphate is not recommended because of ...its low availability, so it is necessary to improve it. In this study, a group of diazotrophic bacteria were evaluated as phosphate-solubilizing bacteria, for their production of indolic compounds and for their effects on growth of maize plants. Strains of the genera Azosporillum, Azotobacter, Rhizobium and Klebsiella, were quantitatively evaluated for solubilization of Ca3(PO4)2 and Rock Phosphate as a single source of phosphorous in SRS culture media. Additionally, the phosphatase enzyme activity was quantified at pH 5.0, 7.0 and 8.0 using p-nitrophenyl phosphate, and production of indolic compounds was determined by colorimetric quantification. The effect of inoculation of bacteria on maize was determined in a completely randomized greenhouse experiment where root and shoot dry weights and phosphorus content were assessed. Results showed that strain C50 produced 107.2 mg .L-1 of available-P after 12 days of fermentation, and AC10 strain had the highest phosphatase activity at pH 8 with 12.7 mg of p-nitrophenol mL .h-1. All strains synthetized indolic compounds, and strain AV5 strain produced the most at 63.03 µg .mL-1. These diazotrophic bacteria increased plant biomass up to 39 % and accumulation of phosphorus by 10%. Hence, use of diazotrophic phosphate-solubilizing bacteria may represent an alternative technology for fertilization systems in maize plants.
JCAP10(2014)023 Dark matter decay or annihilation may produce monochromatic signals in the
gamma-ray energy range. In this work we argue that there are strong theoretical
motivations for studying ...these signals in the framework of gravitino dark
matter decay and we perform a search for gamma-ray spectral lines from 100\,MeV
to 10\,GeV with Fermi-LAT data. In contrast to previous line searches at higher
energies, the sensitivity of the present search is dominated by systematic
uncertainties across most of the energy range considered. We estimate the size
of systematic effects by analysing the flux from a number of control regions,
and include the systematic uncertainties consistently in our fitting procedure.
We have not observed any significant signals and present model-independent
limits on gamma-ray line emission from decaying and annihilating dark matter.
We apply the former limits to the case of the gravitino, a well-known dark
matter candidate in supersymmetric scenarios. In particular, the $R$-parity
violating "$\mu$ from $\nu$" Supersymmetric Standard Model ($\mu\nu$SSM) is an
attractive scenario in which including right-handed neutrinos solves the $\mu$
problem of the Minimal Supersymmetric Standard Model while simultaneously
explaining the origin of neutrino masses. At the same time, the violation of
$R$-parity renders the gravitino unstable and subject to decay into a photon
and a neutrino. As a consequence of the limits on line emission, $\mu\nu$SSM
gravitinos with masses larger than about 5\,GeV, or lifetimes smaller than
about $10^{28}$\,s, are excluded at 95% confidence level as dark matter
candidates.
The \(\mu\nu\)SSM solves the \(\mu\) problem of supersymmetric models and reproduces neutrino data, simply using couplings with right-handed neutrinos \(\nu\)'s. Given that these couplings break ...explicitly \(R\) parity, the gravitino is a natural candidate for decaying dark matter in the \(\mu \nu\)SSM. In this work we carry out a complete analysis of the detection of \(\mu \nu\)SSM gravitino dark matter through \(\gamma\)-ray observations. In addition to the two-body decay producing a sharp line, we include in the analysis the three-body decays producing a smooth spectral signature. We perform first a deep exploration of the low-energy parameter space of the \(\mu \nu\)SSM taking into account that neutrino data must be reproduced. Then, we compare the \(\gamma\)-ray fluxes predicted by the model with Fermi-LAT observations. In particular, with the 95\(\%\) CL upper limits on the total diffuse extragalactic \(\gamma\)-ray background using 50 months of data, together with the upper limits on line emission from an updated analysis using 69.9 months of data. For standard values of bino and wino masses, gravitinos with masses larger than about 4 GeV, or lifetimes smaller than \(10^{28}\) s, produce too large fluxes and are excluded as dark matter candidates. However, when limiting scenarios with large and close values of the gaugino masses are considered, the constraints turn out to be less stringent, excluding masses larger than 17 GeV and lifetimes smaller than \(4\times 10^{25}\) s.
Irritable bowel syndrome (IBS) is a functional gastrointestinal disorder with a clinical diagnosis. The prevalence of this disorder and associated factors are unknown among the Colombian population. ...Nowadays, diagnosis of IBS is made by applying the Rome III criteria, and other disorders should be excluded before establishing the diagnosis.
To assess the prevalence of IBS and associated factors in a population aged between 18 and 60 years old in Bucaramanga, Colombia.
A cross-sectional study was performed. We applied a questionnaire that included sociodemographic variables, types of food, identification of IBS by the Rome III criteria, the Zung self-rating depression scale, the State-Trait Anxiety Inventory (STAI) test and self-reported use of medical services among a random sample of an adult population in Bucaramanga. Univariate analysis and logistic regression was used to establish associations.
Of the 615 individuals selected, 558 were included in the study. The mean age was 36.4 years and 62.4% was female. The prevalence of IBS was 19.9%. Logistic regression analysis showed an association with depressive symptoms and female sex independently of age and anxiety symptoms.
The prevalence of IBS is high and is associated with depressive symptoms and female sex in an adult population in Colombia. This disorder generates substantial health system utilization and medical disability and restricts activities of daily life.
We set conservative, robust constraints on the annihilation and decay of dark matter into various Standard Model final states under various assumptions about the distribution of the dark matter in ...the Milky Way halo. We use the inclusive photon spectrum observed by the Fermi Gamma-ray Space Telescope through its main instrument, the Large Area Telescope. We use simulated data to first find the "optimal" regions of interest in the gamma -ray sky, where the expected dark matter signal is largest compared with the expected astrophysical foregrounds. We then require the predicted dark matter signal to be less than the observed photon counts in the a priori optimal regions. This yields a very conservative constraint as we do not attempt to model or subtract astrophysical foregrounds. The resulting limits are competitive with other existing limits and, for some final states with cuspy dark-matter distributions in the Galactic Center region, disfavor the typical cross section required during freeze-out for a weakly interacting massive particle to obtain the observed relic abundance.
Thyroid storm or thyrotoxic crisis is a life-threatening condition, characterized by signs and symptoms of thyrotoxicosis associated with multiorgan dysfunction, occurs as a complication of ...hyperthyroidism and due to its high risk of mortality, merits timely diagnosis and early treatment. Among the main causes of thyroid storm is Graves' Basedow's disease, which is associated with triggering factors such as non-adherence to medical therapy. The diagnosis is based on clinical manifestations and increased thyroid hormones, but thyroid hormone levels are not related to the severity of the condition, so sensitive scoring systems have been developed to support the diagnostic approach. In this review, we analyze a series of patients with thyroid storm in which half of the patients have a fatal outcome, demonstrating the association with high mortality.
Endobronchial cryotherapy for a mycetoma Rojas-Tula, Diego Germán; Gómez-Fernández, Máximo; García-López, José Javier ...
Journal of bronchology & interventional pulmonology
20, Številka:
4
Journal Article
Recenzirano
Odprti dostop
Mycetoma is defined as a fungus ball that fills a preexisting lung cavity, most frequently being of tuberculous or sarcoid etiology. The most frequently isolated fungus is the species of Aspergillus, ...but other fungi such as Fusarium or Zygomycetes can also be present. Most patients lack symptoms. However, presentation may also be with hemoptysis, which can be massive and life-threatening. We describe the case of a 50-year-old man with a history of prior pulmonary tuberculosis, with recurrent episodes of cough and hemoptysis. He was diagnosed to have mycetoma in the left upper lobe cavity. The mycetoma was extracted through bronchoscopy under general anesthesia using a cryoprobe. Treatment was completed with amphotericin B instilled in the cavity and the patient was placed on oral itraconazole. This is the first case report to date in which cryotherapy was used to remove a mycetoma.
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