GW190412: Observation of a Binary-Black-Hole Coalescence with Asymmetric Masses

We report the observation of gravitational waves from a binary-black-hole coalescence during the first two weeks of LIGO’s and Virgo’s third observing run. The signal was recorded on April 12, 2019 at 05∶30∶44 UTC with a network signal-to-noise ratio of 19. The binary is different from observations during the first two observing runs most notably due to its asymmetric masses: a ∼30 M_⊙ black hole merged with a ∼8 M_⊙ black hole companion. The more massive black hole rotated with a dimensionless spin magnitude between 0.22 and 0.60 (90% probability). Asymmetric systems are predicted to emit gravitational waves with stronger contributions from higher multipoles, and indeed we find strong evidence for gravitational radiation beyond the leading quadrupolar order in the observed signal. A suite of tests performed on GW190412 indicates consistency with Einstein’s general theory of relativity. While the mass ratio of this system differs from all previous detections, we show that it is consistent with the population model of stellar binary black holes inferred from the first two observing runs

GW190412: observation of a binary-black-hole coalescence with asymmetric masses

We report the observation of gravitational waves from a binary-black-hole coalescence during the first two weeks of LIGO’s and Virgo’s third observing run. The signal was recorded on April 12, 2019 at 05∶30∶44 UTC with a network signal-to-noise ratio of 19. The binary is different from observations during the first two observing runs most notably due to its asymmetric masses: a ∼30 M⊙ black hole merged with a ∼8 M⊙ black hole companion. The more massive black hole rotated with a dimensionless spin magnitude between 0.22 and 0.60 (90% probability). Asymmetric systems are predicted to emit gravitational waves with stronger contributions from higher multipoles, and indeed we find strong evidence for gravitational radiation beyond the leading quadrupolar order in the observed signal. A suite of tests performed on GW190412 indicates consistency with Einstein’s general theory of relativity. While the mass ratio of this system differs from all previous detections, we show that it is consistent with the population model of stellar binary black holes inferred from the first two observing runs

ESPECIFICIDAD Y HERBIVORIA DE LEPIDOPTERA SOBRE ESPECIES PIONERAS Y TOLERANTES DEL BOSQUE MESOFILO DE LA RESERVA DE LA BIOSFERA EL CIELO, TAMAULIPAS, MEXICO

We investigated the species of Lepidoptera associated with the six most important plañís, three gap colonizing species [Perymenium ovalifolium, Cercis canadensis var. mexicana and Liquidambar styraciflua) and three shade-tolerant species [Clethra pringiei, Quercus germana and Podocarpus reichei) in the Biosphere Reserve El Cielo at Gómez Parías, Tamaulipas cloud forest. The leveis of herbivory (% If af area eaten) by each lepidopteran larvae were measured during the rainy season. Selectivity tests •.vere carried out evaluating the generalist-specialist insect effect. The resulta showed eigth different lepidopteran species. They consumed 7% of the available leaf area within the six plant species. Por pioneer species the % of leaf area grazed was ca. 3 times greater than for shade-tolerant species loaves. The insects associated with shade-tolerant species were more specialist than the insects associated with pioneer speciesSe reconocen las principales especies de Lepidoptera asociadas a seis especies de plantas con alto valor de importancia ecológico y distinta historia de vida: tres pioneras (Perymenium ovalifolium, Cercis canadensis var. mexicana y Liquidambar styraciflua) y tres tolerantes (Clethra pringlei, Quercus germana y Podocarpus reichei) del bosque mesófilo de la Reserva de la Biosfera El Cielo de Gómez Farías, Tamaulipas. Se llevó a cabo una cuantificación de la herbivoría (% de área foliar) para cada especie vegetal efectuada por larvas de lepidópteros en función del tiempo durante la época lluviosa, analizando el efecto del consumo foliar de cada especie y la historia de vida de las plantas estudiadas. Con la finalidad de reconocer el efecto de la relación generalismo: especificidad para cada lepidóptero, se realizaron pruebas de selectividad manteniendo larvas de cada especie en cautiverio, ofreciéndoles diferentes hospederos y evaluando su consumo foliar. Los resultados muestran ocho diferentes especies de Lepidoptera asociados a las seis especies vegetales. Colectivamente estos lepidópteros consumieron 7% del área foliar disponible de sus hospederos. Las especies de plantas pioneras mostraron ca. 3 veces más herbivoría por lepidópteros que las especies tolerantes. En general, los lepidópteros mostraron una tendencia hacia la especialización, principalmente los asociados a las especies tolerantes

Publicaciones sobre temas de física en las Memorias de la Sociedad Científica Antonio Alzate

The revist or Memorias de la Sociedad Científica Antonio Alzate was a monthly publication, edited by society of the same name founded on october 14th, 1884, in memory of the great Mexican intellectual Antonio Alzate.  This publication became one the most important scientific Mexican Journal of its time, due to the high academic quality if its mexican and foreign contributors.  In this work we analyze en elaborate a database of th articles published en Memorias throug which we can observe the transition from classical to the modern Physics in México.LA Revista o Memorias de la Sociedad Científica Antonio Alzate fue una publicación mensual elaborada por la sociedad del mismo nombre, fundada el 4 de octubre de 1884 en memoria de ese gran pensador mexicano.  Esta publicación llego a ser una de las revistas mexicanas científicas más importantes de us época debido a la calidad de sus escritores, tanto mexicanos como extranjeros. Difundía los avances de la ciencia y la tecnología que se llevaban acabo en los países desarrollados y también los que se pruducían en Méxiaco.  En este trabajo se analiza la base de datos de todos los articulos de la revista,con lo que pudo observarse la transición de ls física clásica a la moderna

Atitudes dos profissionais de enfermagem relacionadas ao Processo de Enfermagem

Os objetivos do estudo foram descrever a disposição sobre o Processo de Enfermagem (PE) e a percepção de poder clínico dos profissionais de enfermagem; analisar associações entre atitudes relacionadas ao PE e variáveis selecionadas. Participaram 1.605 auxiliares de enfermagem e enfermeiros (86,9% mulheres, idade média 44,12 anos; DP=9,55). O escore médio no instrumento Posições sobre o Processo de Enfermagem (PPE) foi 112,37 (DP=22,28) e no Power as Knowing Participation in Change Tool - versão brasileira (PKPCT) foi 281,12 (DP= 38,72). Os escores nos instrumentos foram mais altos para enfermeiros quando comparados aos auxiliares. Houve correlação positiva moderada entre escores do PPE e PKPCT. Para os auxiliares houve associação entre os escores no PPE, sexo e pós-graduação; e entre percepção de poder e sexo. Para os enfermeiros houve associação entre PKPCT e cargo de chefia. Mais estudos devem ser desenvolvidos com vistas a identificar variáveis potencialmente associadas ao uso do Processo de Enfermagem na prática clínica

A dhfr-ts- Leishmania major Knockout Mutant Cross-protects against Leishmania amazonensis

E10-5A3 is a dhfr-ts- Leishmania major double knockout auxotrophic shown previously to induce substantial protection against virulent L. major infection in both genetically susceptible and resistant mice. We investigated the capacity of dhfr-ts- to protect against heterologous infection by L. amazonensis. The degree of protection was evaluated by immunization of BALB/c or C57BL/6 mice with E10-5A3, followed by L. amazonensis challenge. Whether immunized by subcutaneous (SC) or intravenous (IV) inoculation, susceptible and resistant mice displayed a partial degree of protection against challenge with virulent L. amazonensis. SC-immunized BALB/c mice developed lesions 40 to 65% smaller than non immunized mice, while IV immunization led to protection ranging from 40 to 75% in four out of six experiments compared to non immunized animals. The resistant C57BL/6 mice displayed comparable degrees of protection, 57% by SC and 49% by IV immunization. Results are encouraging as it has been previously difficult to obtain protection by SC vaccination against Leishmania, the preferred route for human immunization

Many Labs 5: Registered multisite replication of tempting-fate effects in Risen & Gilovich (2008).

status: accepte