7,316 research outputs found
Betalains and phenolic compounds of leaves and stems of Alternanthera brasiliana and Alternanthera tenella
Betacyanins and phenolic compounds from acetonitrile:acidified water extracts of Alternanthera brasiliana and Alternanthera tenella were characterized and quantified using a high-performance liquid chromatography system coupled with diode array and electrospray mass spectrometry detection. Four betacyanins (amaranthine, isoamaranthine, betanin and isobetanin) were tentatively identified and quantified. Twenty eight phenolic compounds of four different families (hydroxybenzoic and hydroxycinnamic acids, flavones and flavonols) were separated and characterized on the basis of their accurate MS and MS/MS information out of which ten compounds were confirmed by authentic standards. These plant species could be considered as an especially rich source of natural bioactive compounds and potential food colorants. A. brasiliana showed the highest betacyanin and polyphenols content (89 μg/g and 35,243 μg/g, respectively). Among polyphenols, flavonols were the more abundant (kaempferol-glucoside, kaempferol-rutinoside and kaempferol-rhamnosyl-rhamnosyl-glycoside). Meanwhile, A. tenella showed a different polyphenols profile with flavones as major compounds (glucopyranosil-vitexin and vitexin). As a novelty, pentosyl-vitexin and pentosyl-isovitexin were detected for the first time in Alternanthera plants. Both A. brasiliana and A. tenella leaves showed high total polyphenol content and in vitro antioxidant activity (FRAP). These results provide an analytical base concerning the phenolic and betalains composition and the antioxidant properties of two members of the promising Alternanthera gender, for subsequent applications, such as functional food ingredients.Fil: Deladino, Lorena. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigación y Desarrollo en Criotecnología de Alimentos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Criotecnología de Alimentos. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Criotecnología de Alimentos; ArgentinaFil: Alvarez, I.. Consejo Superior de Investigaciones Científicas. Instituto de Ciencia y Tecnologia de Alimentos y Nutrición; EspañaFil: De Ancos, B.. Consejo Superior de Investigaciones Científicas. Instituto de Ciencia y Tecnologia de Alimentos y Nutrición; EspañaFil: Sánchez Moreno, C.. Consejo Superior de Investigaciones Científicas. Instituto de Ciencia y Tecnologia de Alimentos y Nutrición; EspañaFil: Molina García, A. D.. Consejo Superior de Investigaciones Científicas. Instituto de Ciencia y Tecnologia de Alimentos y Nutrición; EspañaFil: Schneider Teixeira, Aline. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigación y Desarrollo en Criotecnología de Alimentos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Criotecnología de Alimentos. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Criotecnología de Alimentos; Argentina. Consejo Superior de Investigaciones Científicas. Instituto de Ciencia y Tecnologia de Alimentos y Nutrición; Españ
Affine convex body semigroups
In this paper we present a new kind of semigroups called convex body
semigroups which are generated by convex bodies of R^k. They generalize to
arbitrary dimension the concept of proportionally modular numerical semigroup
of [7]. Several properties of these semigroups are proven. Affine convex body
semigroups obtained from circles and polygons of R^2 are characterized. The
algorithms for computing minimal system of generators of these semigroups are
given. We provide the implementation of some of them
Exception for the zero-forward-scattering theory
Studies on single scattering of electromagnetic waves by magnetic particles were reported in the 1980s by Kerker et al. [J. Opt. Soc. Am. 73, 765 (1983)] . They obtained that very small spherical particles with electric permittivity and magnetic permeability values such that ε=(4−μ)/(2μ+1) do not produce forward scattering. We show here that this condition contains an interesting exception at ( ε=−2 , μ=−2 ) when electric and magnetic resonances are present and around which the scattered field distribution is computed and described showing a polarization-insensitive behavior at the point ( ε=−2 , μ=−2 )
Kon-tiki/Perdido enhances PS2 integrin adhesion and localizes its ligand, Thrombospondin, in the myotendinous junction.
Cell-extracellular matrix adhesion is mediated by cell receptors, mainly integrins and transmembrane proteoglycans, which can functionally interact. How these receptors are regulated and coordinated is largely unknown and key to understand cell adhesion in development. We show that the conserved transmembrane proteoglycan Kon-tiki/Perdido (Kon) interacts with αPS2βPS integrin to mediate muscle-tendon adhesion. Double mutant embryos for kon and inflated show a synergistic increase in muscle detachment. Furthermore, Kon modulates αPS2βPS signaling at the muscle attachment, since P-Fak is reduced in kon mutants. This reduction in integrin signaling can be rescued by the expression of a truncated Kon protein containing the transmembrane and extracellular domains, suggesting that these domains are sufficient to mediate this signaling. We show that these domains are sufficient to properly localize the αPS2βPS ligand, Thrombospondin, to the muscle attachment, and to partially rescue Kon dependent muscle-tendon adhesion. We propose that Kon can engage in a protein complex with αPS2βPS and enhance integrin-mediated signaling and adhesion by recruiting its ligand, which would increase integrin-binding affinity to the extracellular matrix, resulting in the consolidation of the myotendinous junction.Ramón y Cajal program and the Universidad Pablo de
Olavide. Research was funded by the Ministerio de Economıa y Competitividad ́
(Spanish Ministry of Science and Innovation) (BFU2008-036550, BFU2011-26745).
Proyecto de Excelencia of the Consejerıa de Econom ́ ıa, ́
Innovación, Ciencia y Empleo, Junta de Andalucıa (PO9-CVI-5058). A.G.E.-Z. and ́ the Ministerio de Ciencia e Innovación
(Spanish Ministry of Science and Innovation) (BFU2008-036550, BFU2011-26745)
Gypsum mining spoil improves plant emergence and growth in soils polluted with potentially harmful elements
Purpose Soil pollution is a major problem worldwide.
Some anthropogenic activities, such as mining, may
exceed soil capacity, causing relevant health and ecosystem
hazards. The use of mineral amendments can
help reduce soil pollution. Gypsum mining spoil (GS)
is a waste material highly produced in gypsum mining
industry, which has never been used in soil remediation
despite its high potential as amendment of polluted
soils. In this study, we carried out an ex-situ experiment
to assess for the first time the capacity of GS to both
reduce the availability of Potentially Harmful Elements
(PHEs) in soils and promote seed emergence.
Methods Soils affected by residual pollution after
the Aznalcóllar mine spill were collected, treated with GS in three different proportions, and sown
with seeds of two non-genetically related species.
Seed emergence and biomass production were
monitored, and PHE content in soils and plants
were analysed.
Results We have observed a direct and very positive
relation between GS and both the reduction of PHE
availability and PHE uptake by plants, and the increase
of plant emergence and growth, especially with the
addition of the highest doses of the amendment.
Conclusion This study highlights the promising
results of GS as a novel soil amendment to be used
in the remediation of polluted soils and vegetation
recovery. Moreover, using GS as soil amendment
will bring the opportunity to sustainably manage this
waste material and reduce its social and environmental
impact parallelly to the mitigation of PHE hazards.KNAUF-GmbHMinistry of Science, Innovation and Universities RTI 2018-094327-B-I00Tatiana-Perez-de-Guzman-el-Bueno Foundation PhD grant Programme 201
Conservation of the Spanish Alano dog breed: phaneroptical characterisation
A preliminary phaneroptical characterisation of the Spanish Alano Dog Breed is done studying, on a random sample formed by 135 specimens, six external variables: coat colour and distribution; hair type; mucosae, and iris colour; type of bite; and absence of premolars. We have concluded that this breed is characterised by the presentation of yellow and brindled coats, with other coat colours as residuals, standing out the combined black and brindled coat, not present in other related breeds, what could be considered as a breed marker character. The breed is also characterised by short hair, black pigmented mucosae , brown iris, with general presentation of a mask. The dentition characteristics are the presence of a prognatic bite (slight) and absence of premolars, both characters related to the origin of the breed.Se realiza una caracterización faneróptica preliminar sobre una muestra aleatoria de 135 ejemplares de raza Alano Español. Se consideran las variables: color y distribución de la capa, tipo de pelo, coloración de las mucosas e iris, tipo de mordida y ausencia de premolares. Se concluye que el Alano Español presenta como capas predominantes la barcina y la leonada, siendo minoritarias la capa negro y bardino, ausente en la mayoría de razas consultadas, y que podría constituirse como un carácter marcador de raza. Asimismo la raza se caracteriza por presentar pelo liso, mucosas pigmentadas en negro, iris de color castaño, con presencia de máscara generalmente. La raza mayoritariamente presenta una mordida prognática (tijera invertida), con ausencia de premolares, caracteres ambos acordes con el origen de la raza
Analysis of Degree of Weak Efficiency in some European Financial Markets. The First Impact of COVID-19
En este artículo se evalúa el grado de cumplimiento de la hipótesis de
eficiencia débil en los mercados financieros de España, Alemania, Francia e
Italia en el período 1 de enero de 2010 a 15 de mayo de 2020. Los resultados
indican que los mercados analizados son eficientes en la forma que establece
el paseo aleatorio 3 si bien el español es el que muestra menor grado de
eficiencia. Los cuatro mercados presentan la mayor volatilidad del período a
mediados de marzo de 2020, tras la declaración de la pandemia del COVID-19
por la OMSIn this paper is evaluated the degree of fulfilment of the hypothesis of weak
efficiency in the financial markets of Spain, Germany, France and Italy, from
1st January 2010 to 15th May 2020. The results show that the markets are
efficient in the form established by the random walk 3. On the other hand,
all the markets show their highest volatility in the middle of March 2020, just
after the WHO declared the COVID-19 pandemi
Recargos de capital en carteras crediticias concentradas en un número reducido de acreditados
Artículo de revist
Generalised median of a set of correspondences based on the hamming distance.
A correspondence is a set of mappings that establishes a relation between the elements of two data structures (i.e. sets of points, strings, trees or graphs). If we consider several correspondences between the same two structures, one option to define a representative of them is through the generalised median correspondence. In general, the computation of the generalised median is an NP-complete task. In this paper, we present two methods to calculate the generalised median correspondence of multiple correspondences. The first one obtains the optimal solution in cubic time, but it is restricted to the Hamming distance. The second one obtains a sub-optimal solution through an iterative approach, but does not have any restrictions with respect to the used distance. We compare both proposals in terms of the distance to the true generalised median and runtime
- …