Oscillatons revisited

In this paper, we study some interesting properties of a spherically symmetric oscillating soliton star made of a real time-dependent scalar field which is called an oscillaton. The known final configuration of an oscillaton consists of a stationary stage in which the scalar field and the metric coefficients oscillate in time if the scalar potential is quadratic. The differential equations that arise in the simplest approximation, that of coherent scalar oscillations, are presented for a quadratic scalar potential. This allows us to take a closer look at the interesting properties of these oscillating objects. The leading terms of the solutions considering a quartic and a cosh scalar potentials are worked in the so called stationary limit procedure. This procedure reveals the form in which oscillatons and boson stars may be related and useful information about oscillatons is obtained from the known results of boson stars. Oscillatons could compete with boson stars as interesting astrophysical objects, since they would be predicted by scalar field dark matter models.Comment: 10 pages REVTeX, 10 eps figures. Updated files to match version published in Classical and Quantum Gravit

Trends in the extinction of carnivores in Madagascar

Tendencias de la extinción de carnívoros en Madagascar La extinción de los depredadores apicales, como los mamíferos carnívoros, puede conllevar cambios drásticos en la estructura de la red alimentaria y la dinámica de los ecosistemas. Dado que todos los mamíferos carnívoros terrestres autóctonos de Madagascar son endémicos, su extinción implica una pérdida notable de biodiversidad en este país. En el presente artículo examinamos las publicaciones sobre mamíferos carnívoros de Madagascar con el propósito de determinar cuáles son las especies que tienen mayor probabilidad de extinguirse en un futuro próximo, en vista de los factores que amenazan su supervivencia. Puntuamos cada factor en función de los efectos que ejerce en las especies. Según nuestros resultados, la especie que tiene más probabilidad de extinguirse es la mangosta rayada grande, Galidictis grandidieri, lo cual no es sorprendente porque esta especie se considera uno de los carnívoros más escasos del mundo, que habita solo en un ecosistema forestal pequeño y amenazado. Asimismo, nuestros resultados ponen de manifiesto la necesidad de disponer de datos sólidos sobre cada especie, a fin de ayudar y respaldar a las autoridades a poner en práctica medidas de conservación.The extinction of top predators, such as mammalian carnivores can lead to dramatic changes in foodweb structure and ecosystem dynamics. Since all native Malagasy terrestrial mammalian carnivores are endemic, their extinction implies a significant loss of biodiversity in Madagascar. Here we review the literature on Madagascar’s mammalian carnivores, aiming to determine which species are most likely to become extinct in the near future in view of the factors threatening their survival. We scored each factor according to its impact on the species. According to our results, the giant–striped mongoose, Galidictis grandidieri, is the most likely species to next become extinct. This is no surprise because this species is considered one of the rarest carnivores in the world, inhabiting only a small, threatened forest ecosystem. Our results emphasize the need for robust data about each species to help and support decision–makers implement conservation measures.Tendencias de la extinción de carnívoros en Madagascar La extinción de los depredadores apicales, como los mamíferos carnívoros, puede conllevar cambios drásticos en la estructura de la red alimentaria y la dinámica de los ecosistemas. Dado que todos los mamíferos carnívoros terrestres autóctonos de Madagascar son endémicos, su extinción implica una pérdida notable de biodiversidad en este país. En el presente artículo examinamos las publicaciones sobre mamíferos carnívoros de Madagascar con el propósito de determinar cuáles son las especies que tienen mayor probabilidad de extinguirse en un futuro próximo, en vista de los factores que amenazan su supervivencia. Puntuamos cada factor en función de los efectos que ejerce en las especies. Según nuestros resultados, la especie que tiene más probabilidad de extinguirse es la mangosta rayada grande, Galidictis grandidieri, lo cual no es sorprendente porque esta especie se considera uno de los carnívoros más escasos del mundo, que habita solo en un ecosistema forestal pequeño y amenazado. Asimismo, nuestros resultados ponen de manifiesto la necesidad de disponer de datos sólidos sobre cada especie, a fin de ayudar y respaldar a las autoridades a poner en práctica medidas de conservación

New insight into breast cancer cells involving drug combinations for dopamine and serotonin receptors

The breast cancer therapies available are insufficient, especially since first-line treatments, such as paclitaxel, result in drug resistance and their toxicity often limits their concentration. Strategies like drug repurposing are beneficial, and novel treatments can emerge by repurposing drugs that interfere with the dopamine and serotonin receptors, and thus influence tumor growth. In this study, the MTT assay was used to test the efficacy of such repurposed drugs commonly used for neurodegenerative disorders that act on the dopamine and serotonin receptors to reduce the MCF7 cell’s viability, either by their single use or in combination with the reference drug paclitaxel. Furthermore, the expression of vimentin and E-cadherin was assayed by immunofluorescence. The dopamine receptor-altering drugs benztropine and thioridazine resulted in the strongest reduction of cell viability when combined with paclitaxel, which may be connected to the alteration of E-cadherin rather than vimentin expression. More studies are needed to understand the mechanism of action of the combinations tested and the efficacious role of dopamine and serotonin.This work was supported by Fundação para a Ciência e Tecnologia (FCT, Portugal) and FEDER (Fundo Europeu de Desenvolvimento Regional) funds through the COMPETE 2020 Operational Programme for Competitiveness and Internationalisation (POCI), Portugal, in the framework of the project IF/00092/2014/CP1255/CT0004. N.V. thanks Fundação para a Ciência e a Tecnologia (FCT, Portugal) for supporting these studies through nationally-funded projects within the CINTESIS R&D unit (reference UIDB/4255/2020). The contents of this report are solely the responsibility of the authors and do not necessarily represent the official view of the FCT

Quantum-state synthesis of multi-mode bosonic fields: Preparation of arbitrary states of 2-D vibrational motion of trapped ions

We present a universal algorithm for an efficient deterministic preparation of an arbitrary two--mode bosonic state. In particular, we discuss in detail preparation of entangled states of a two-dimensional vibrational motion of a trapped ion via a sequence of laser stimulated Raman transitions. Our formalism can be generalized for multi-mode bosonic fields. We examine stability of our algorithm with respect to a technical noise.Comment: 8 pages, revtex, including 2 ps-figures, section about physical implementation added, references updated, submitted to Phys. Rev. A, computer program available at http://www.savba.sk/sav/inst/fyzi/qo

Nymphal development of Podisus nigrispinus (Heteroptera, Pentatomidae) preying on larvae of Anticarsia gemmatalis (Lepidoptera, Noctuidae) fed with resistant and susceptible soybeans.

Nymphal development of the predator Podisus nigrispinus (Dallas) fed with a susceptible (UFV 16) or an insect resistant soybean genotype (IAC 17) and with larvae of the prey Anticarsia gemmatalis Hubner (Lepidoptera, Noctuidae) reared on these genotypes, was evaluated. Survival and duration of each instar and of total nymphal stage, besides weight of nymphs at the beginning of each instar and of adults of P. nigrispinus soon after emergence, were also evaluated. Nymphal survival of this predator was similar with both genotypes (64.41% for the UFV 16 and 72.88% for the IAC 17). Duration of second and fourth instars for nymphs that originated females, of fourth instar for those that originated males, of the nymphal period for males (20.21 and 17.94 days) and females (19.76 and 18.19 days) was longer on the IAC 17 than on the UFV 16. Weight of third instar nymphs (3.12 mg and 2.42 mg) for those that originated males and of fifth instar (26.20 mg and 23.86 mg) for those that originated females weight after emergence (65.76 mg and 58.68 mg) was lower with the IAC 17 than with the UFV 16. Sex ratio of P. nigrispinus was not affected by the resistant soybean IAC 17

MEASUREMENT OF THE REGRESSION RATE IN A HYBRID ROCKET MOTOR BY ACQUIRING THE HELMHOLTZ FREQUENCY IN THE COMBUSTION CHAMBER

Low thrust values obtained with a hybrid rocket motor (HRM) are a consequence of the difficulty in quickly mixing the fuel and oxidizer, which is characterized by a low regression rate of the fuel grain. Therefore, the measurement of this parameter is of great importance in studies that aim at solutions for this deficiency in HRM. Several studies calculate a reliable value of the average regression rate over time by measuring the total mass of fuel before and after each burn. A method to measure instantaneous regression rate is by acquiring the Helmholtz resonance frequency in the combustion chamber. This work uses a piezoelectric pressure transducer to obtain the Helmholtz frequency mode of the combustion chamber in a laboratory scale test bench with high-density polyethylene (HDPE) and gaseous oxygen, and is based on the principle that this frequency is inversely proportional to the square-root of the chamber volume. With the chamber volume variation, the port diameter of the grain variation is obtained. In conclusion, the calculated variation of port diameter agreed well with the correlation for average regression rate, determined from mass loss during operation

Phenomemology of a Realistic Accelerating Universe Using Tracker Fields

We present a realistic scenario of tracking of scalar fields with varying equation of state. The astrophysical constraints on the evolution of scalar fields in the physical universe are discussed. The nucleosynthesis and the galaxy formation constraints have been used to put limits on $\Omega_\phi$ and estimate $\epsilon$ during cosmic evolution. Interpolation techniques have been applied to estimate $\epsilon\simeq0.772$ at the present epoch. The epoch of transition from matter to quintessence dominated era and consequent onset of acceleration in cosmic expansion is calculated and taking the lower limit $\Omega_n^0 = 0.2$ as estimated from $SN_e I_a$ data, it is shown that the supernova observations beyond redshift $z=1$ would reveal deceleration in cosmic expansion.Comment: 10 pages, 4 figures, late

Métodos de superação de dormência em Piptadenia adiantoides (SPRENG.) J.F. MACBR. (Fabaceae:Mimosoideae).

O objetivo deste trabalho foi avaliar os tratamentos mais eficazes na promoção da germinação de sementes de P. adiantoides, propor sua utilização como alternativa para o reflorestamento e proporcior novas informações sobre a espécie Piptadenia adiantoides

Diagonal extendible multilinear operators between l(p)-spaces

[EN] We study extendibility of diagonal multilinear operators from l(p) to l(p) spaces. We determine the values of and for which every diagonal -linear operator is extendible, and those for which the only extendible ones are integral. We address the same question for multilinear forms on l(p).D. Carando, V. Dimant and R. Villafane were partially supported by CONICET PIP 0624 and UBACyT 20020100100746. P. Sevilla-Peris was supported by MICINN Project MTM2011-22417. R. Villafane has a doctoral fellowship from CONICET.Carando, D.; Dimant, V.; Sevilla Peris, P.; Villafañe, R. (2014). Diagonal extendible multilinear operators between l(p)-spaces. Revista de la Real Academia de Ciencias Exactas, Fisicas y Naturales. Serie A. Matematicas (RACSAM). 108(2):541-555. https://doi.org/10.1007/s13398-013-0125-7S5415551082Alencar, R.: Multilinear mappings of nuclear and integral type. Proc. Am. Math. Soc. 94(1), 33–38 (1985)Alencar, R., Matos, M.: Some classes of multilinear mappings between Banach spaces. Pub. Dep. An. Mat. Univ. Complut. Madrid 12 (1989)Blei, R.C.: Multilinear measure theory and the Grothendieck factorization theorem. Proc. Lond. Math. Soc. 56(3), 529–546 (1988)Bohnenblust, H.F., Hille, E.: On the absolute convergence of Dirichlet series. Ann. Math. (2) 32(3), 600–622 (1931)Botelho, G., Braunss, H., Junek, H., Pellegrino, D.: Holomorphy types and ideals of multilinear mappings. Studia Math. 177, 43–65 (2006)Botelho, G., Michels, C., Pellegrino, D.: Complex interpolation and summability properties of multilinear operators. Rev. Mat. Complut. 23(1), 139–161 (2010)Botelho, G., Pellegrino, D.: Two new properties of ideals of polynomials and applications. Indag. Math. (N.S.) 16157–16169 (2005)Botelho, G., Pellegrino, D.: When every multilinear mapping is multiple summing. Math. Nachr. 282(10), 1414–1422 (2009)Çalışkan, E., Pellegrino, D.: On the multilinear generalizations of the concept of absolutely summing operators. Rocky Mt. J. Math. 37, 1137–1154 (2007)Carando, D.: Extendibility of polynomials and analytic functions on $$\ell _{p}$$ . Studia Math. 145(1), 63–73 (2001)Carando, D., Dimant, V., Muro, S.: Coherent sequences of polynomial ideals on Banach spaces. Math. Nachr. 282(8), 1111–1133 (2009)Carando, D., Dimant, V., Sevilla-Peris, P.: Limit orders and multilinear forms on $$\ell _p$$ spaces. Publ. Res. Inst. Math. Sci. 42(2), 507–522 (2006)Carando, D., Dimant, V., Sevilla-Peris, P.: Multilinear Hölder $$-$$ type inequalities on Lorentz sequence spaces. Studia Math. 195(2), 127–146 (2009)Carando, D., Lassalle, S.: Extension of vector-valued integral polynomials. J. Math. Anal. Appl. 307(1), 77–85 (2005)Carando, D., Sevilla-Peris, P.: Extendibility of bilinear forms on Banach sequence spaces. Israel J. Math., arXiv:1212.0777 (to appear)Castillo, J., García, R., Jaramillo, J.A.: Extension of bilinear forms on Banach spaces. Proc. Am. Math. Soc. 129(12), 3647–3656 (2001)Carl, B.: A remark on $$p$$ -integral and $$p$$ -absolutely summing operators from $$\ell _u$$ into $$\ell _v$$ . Studia Math. 57(3), 257–262 (1976)Defant, A., Floret, K.: Tensor norms and operator ideals. North Holland, Amsterdam (1993)Diestel, J., Jarchow, H., Tonge, A.: Absolutely summing operators. Cambridge University Press, Cambridge (1995)Dineen, S.: Complex analysis on infinite dimensional spaces. Springer-Verlag, London (1999)Jarchow, H., Palazuelos, C., Pérez-García, D., Villanueva, I.: Hahn–Banach extension of multilinear forms and summability. J. Math. Anal. Appl. 336(2), 1161–1177 (2007)Kirwan, P., Ryan, R.: Extendibility of homogeneous polynomials on Banach spaces. Proc. Am. Math. Soc. 126(4), 1023–1029 (1998)König, H.: Diagonal and convolution operators as elements of operator ideals. Math. Ann. 218(2), 97–106 (1975)Lindenstrauss, J., Tzafriri, L.: Classical Banach spaces II. Springer, Berlin (1977)Matos, M.: Absolutely summing holomorphic mappings. An. Acad. Bras. Ci. 68, 1–13 (1996)Maurizi, B., Queffélec, H.: Some remarks on the algebra of bounded Dirichlet series. J. Fourier Anal. Appl. 16(5), 676–692 (2010)Mujica, J.: Complex analysis in Banach spaces. North-Holland mathematics studies, vol. 120, North-Holland (1986)Pérez-García, D.: Comparing different classes of absolutely summing multilinear operators. Arch. Math. (Basel) 85(3), 258–267 (2005)García Pérez, D.: The trace class is a $$Q$$ -algebra. Ann. Acad. Sci. Fenn. Math. 31(2), 287–295 (2006)Pietsch, A.: Operator ideals. Mathematische monographien (Mathematical monographs), 16. VEB Deutscher Verlag der Wissenschaften, Berlin (1978)Pisier, G.: Counterexamples to a conjecture of Grothendieck. Acta Math. 151(3–4), 181–208 (1983)Ryan, R: Introduction to tensor products of Banach spaces. Springer monographs in mathematics, Springer-Verlag, London (2002)Villanueva, I.: Integral mappings between Banach spaces. J. Math. Anal. Appl. 279(1), 56–70 (2003