1,214 research outputs found
Tin(iv) Phosphonates With α-layered Structure: Synthesis And Characterization
The synthesis of layered compounds of the general formula Sn(RPO 3)2·xH2O (R = phenyl, 2-carboxyethyl) and Sn(RPO3)2·xH2O (R = dodecyl) are reported. These compounds are formed by the reaction of nitric solutions of SnCl4 with the phosphonic acid or phosphoric ester followed by heating under reflux. The interlayer distances of 13.87, 15.37 and 32.70 Å for 2-carboxyethyl, phenyl and dodecyl derivatives, respectively, are determined by the XRD patterns. A linear relationship between the molar volume and the interlayer distance is observed suggesting an alpha structure similar to α-Sn(RPO4)2·H2O. FTIR spectra show the formation of an Sn- O-P skeleton.2101075107
Susceptibility of adults of the cerambycid beetle Hedypathes betulinus to the entomopathogenic fungi Beauveria bassiana, Metarhizium anisopliae, and Purpureocillium lilacinum
Fil: Schapovaloff, M.E.. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Estudios en Parasitología y Vectores; ArgentinaFil: Alves, L.F.A.. Universidade Estadual do Oeste do Paraná. Laboratório de Biotecnologia Agrícola; BrasilFil: Fanti, A.L.. Universidade Estadual do Oeste do Paraná. Laboratório de Biotecnologia Agrícola; BrasilFil: Alzogaray, R.A.. Centro de Investigaciones de Plagas e Insecticidas; ArgentinaFil: López Lastra, Claudia Cristina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Estudios en Parasitología y Vectores; Argentin
Dry‐Cured Meat Products According to the Smoking Regime: Process Optimization to Control Polycyclic Aromatic Hydrocarbons
The manufacturing of dry‐cured meat products usually includes a smoking step. Polycyclic aromatic hydrocarbons (PAHs) are potentially carcinogenic chemical compounds that may result from smoking. The aim of the present study was to optimize the smoking regime of traditional dry‐cured meat products in order to minimize the presence of PAHs. Dry‐cured sausages were submitted to different smoking regimes: (A) no smoking; (B) 20 h effective smoking; (C) 60 h effective smoking; (D) effective smoking until reaching 38%–40% weight losses. Three independent batches were produced per smoking regime, and three samples per batch were analyzed. Microbiological, physicochemical, and sensory analyses were performed. The total PAHs content was generally low and did not differ significantly in meat products submitted to the four different smoking regimes. The PAH4 and benzo(α)pyrene levels were below the established legal limits in all analyzed dry‐cured sausages. Nevertheless, non‐smoked sausages always showed lower PAHs values for all PAHs groups
Properties of Interfaces in the two and three dimensional Ising Model
To investigate order-order interfaces, we perform multimagnetical Monte Carlo
simulations of the and Ising model. Following Binder we extract the
interfacial free energy from the infinite volume limit of the magnetic
probability density. Stringent tests of the numerical methods are performed by
reproducing with high precision exact results. In the physically more
interesting case we estimate the amplitude of the critical
interfacial tension to be . This
result is in good agreement with a previous MC calculation by Mon, as well as
with experimental results for related amplitude ratios. In addition, we study
in some details the shape of the magnetic probability density for temperatures
below the Curie point.Comment: 25 pages; sorry no figures include
Alterações Físicas Em Latossolos Cultivados Com Plantas De Cobertura Em Rotação Com Soja E Milho
This study was conducted to evaluate the effect of different covers, grown in rotation with soybean and corn on the physical attributes of two Oxisols. The experiments were installed in Votuporanga, SP, Brazil and Selvíria, MS, Brazil in March 2008, after conventional tillage. The experimental design was a randomized complete block with four replications, using the following cover crops at different amounts of seeds: Sorghum bicolor, Pennisetum americanum, S. sudanense, hybrid of S. bicolor with S. sudanense, Urochloa ruziziensis and a control with spontaneous vegetation. We evaluated the dry matter yield of different covers, and macroporosity, microporosity, total porosity and bulk density, in the layers of 0-0.05, 0.05-0.20 and 0.20-0.40 m. It concludes that, different covers plants and seed amounts used for grains, seeds and forage after two years did not cause effects on some soil physical properties of the two Oxisols.11314915
Estabilidade De Agregados Em Latossolos Sob Plantas De Cobertura Em Rotação Com Soja E Milho
The objective was to evaluate the effect of different covers on the stability of soil aggregates in two areas of Oxisols, grown in rotation with crops of soybean and corn. The experiments were installed in Votuporanga, São Paulo, Brazil and Selvíria, Mato Grosso do Sul, Brazil in March 2008. The experimental design was a randomized block with four replicates and the following cover crops in different spending ha-1 seeds, were the treatments: Sorghum bicolor, 6, 7 and 8 kg ha-1; Pennisetum americanum, 10, 15 and 20 kg ha-1; S. sudanense, 12, 15 and 18 kg ha-1; hybrid of S. bicolor and S. sudanense, 8, 9 and 10 kg ha-1; Urochloa ruziziensis, 8, 12 and 16 kg ha-1; plus, control treatment with spontaneous vegetation. We evaluated the dry matter yield of different covers and were separate classes of soil aggregates and calculated the average diameter. It is noted that the cover crops had similar behavior on aggregates stability in the surface layer, and in the greater depth, the S. sudanense was more efficient in improving the class mean diameter between 2.0-1.0 mm, in Votuporanga, and the P. americanum was more efficient from 4.0 to 2.0 mm and 2.0-1.0 mm in Selvíria. Lower spending seeds was more promising on aggregate stability.11315616
A Note on Energy-Momentum Conservation in Palatini Formulation of L(R) Gravity
By establishing that Palatini formulation of gravity is equivalent to
Brans-Dicke theory, we show that energy-momentum tensor is
covariantly conserved in this type of modified gravity theory.Comment: 7 page
Urinary schistosomiasis in Guinea Bissau
Urogenital schistosomiasis due to Schistosoma (S.) haematobium
is among the most prevalent parasitoses in sub-Saharan Africa.
The pathology is characterized by serious and irreversible lesions
in the urogenital tract induced by chronic infection with the parasite
that can eventually lead to renal failure due to hydronephrosis
and to squamous cell carcinoma of the bladder. Considering the
frequency and severe morbidity observed already in young children,
the purpose of this pilot study was to assess the prevalence
and morbidity of S. haematobium infection in Guinea Bissau.
A baseline survey was conducted during September 2011. A
randomly selected sample of 90 children aged 6–15 years old
was included in this study.
Prevalence of S. haematobium infection was 20% (18/90). It
was higher in older children (median age in years: 15.4 2.71
vs. 9.3 2.22; P < 0.001), a significant gender difference in
prevalence and intensity was not found. The predominant symptom
was haematuria (87.1%), this symptom being strongly associated
with S. haematobium infection (P < 0.01).
Anthropometric examination revealed that growth in infected
boys was impaired as compared to non-infected boys (median
height in cm: 123.3 21.07 vs. 134.71 15.1) (P < 0.05).
To our knowledge this is the first epidemiologic report of
S. haematobium infection in Guinea Bissau. Considering the high
prevalence of S. haematobium infections in Guinea Bissau and
the long-term risks, including renal failure and bladder cancer,
our results indicate that this population should be targeted for
follow-up and implementation of measures for treatment and
control of schistosomiasis
A model independent spin analysis of fundamental particles using azimuthal asymmetries
Exploiting the azimuthal angle dependence of the density matrices we
construct observables that directly measure the spin of a heavy unstable
particle. A novelty of the approach is that the analysis of the azimuthal angle
dependence in a frame other than the usual helicity frame offers an independent
cross-check on the extraction of the spin. Moreover, in some instances when the
transverse polarisation tensor of highest rank is vanishing, for an accidental
or dynamical reason, the standard azimuthal asymmetries vanish and would lead
to a measurement with a wrong spin assignment. In a frame such as the one we
construct, the correct spin assignment would however still be possible. The
method gives direct information about the spin of the particle under
consideration and the same event sample can be used to identify the spins of
each particle in a decay chain. A drawback of the method is that it is
instrumental only when the momenta of the test particle can be reconstructed.
However we hope that it might still be of use in situations with only partial
reconstruction. We also derive the conditions on the production and decay
mechanisms for the spins, and hence the polarisations, to be measured at a
collider experiment. As an example for the use of the method we consider the
simultaneous reconstruction, at the partonic level, of the spin of both the top
and the in top pair production in in the semi-leptonic channel.Comment: 42 pages, 7 figures, 4 table
In vivo evaluation of antiseptics and disinfectants on control of Caseous Lymphadenitis: clinical, haematological, serological and microbiological monitoring
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