Navegação Ciências Exatas e da Terra por Título
Resultados 1129-1148 de 5964
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Decreased expression of the thyroid hormone‑inactivating enzyme type 3 deiodinase is associated with lower survival rates in breast cancer
(2020) [Artigo de periódico]Thyroid hormones (THs) are critical regulators of cellular processes, while changes in their levels impact all the hallmarks of cancer. Disturbed expression of type 3 deiodinase (DIO3), the main TH-inactivating enzyme, ... -
Decreases in procalcitonin and C-reactive protein are strong predictors of survival in ventilator-associated pneumonia
(2006) [Artigo de periódico]Introduction This study sought to assess the prognostic value of the kinetics of procalcitonin (PCT), C-reactive protein (CRP) and clinical scores (clinical pulmonary infection score (CPIS), Sequential Organ Failure ... -
Deep colour-magnitude diagrams of LMC field stars imaged with HST
(2001) [Artigo de periódico]We present deep photometry V < ~26 in V and I bands obtained with the Wide Field and Planetary Camera 2 on board the Hubble Space Telescope for 7 fields ~5◦ away from the Large Magellanic Cloud centre. The fields contain, ... -
Deep imaging of Virgo Z : not a nearby ultrafaint dwarf galaxy, but a distant compact group of galaxies
(2013) [Artigo de periódico]Context. The search for Milky Way faint satellite galaxies and star clusters has been intensified in recent years thanks to the Sloan Digital Sky Survey (SDSS), and other efforts to verify candidate objects. Aims. We ... -
Deeply virtual Compton scattering and saturation approach
(2003) [Artigo de periódico]We investigate the deeply virtual Compton scattering (DVCS) in the color dipole approach, implementing the dipole cross section through the saturation model, which interpolates successfully between soft and hard regimes. ... -
Deep SOAR follow-up photometry of two Milky Way outer-halo companions discovered with Dark Energy Survey
(2018) [Artigo de periódico]We report the discovery of a new star cluster, DES 3, in the constellation of Indus, and deeper observations of the previously identified satellite DES J0222.7−5217 (Eridanus III). DES 3 was detected as a stellar overdensity ... -
Deep surface photometry of edge-on spirals in Abell galaxy clusters constraining environmental effects
(2008) [Artigo de periódico]Context. There is a clear scarcity of structural parameters for stellar thick discs, especially for spiral galaxies located in high-density regions, such as galaxy clusters and compact groups. Aims. We have modelled the ... -
A deep view of a fossil relic in the Galactic bulge : the Globular Cluster HP1
(2019) [Artigo de periódico] -
Defects and magnetic hyperfine fields in ZrFe/sub 2/ investigated using perturbed-angular-correlation spectroscopy
(1999) [Artigo de periódico]We have measured the temperature dependence of the electric and magnetic hyperfine interactions at 181Ta nuclei substituted into the Zr site in the Laves-phase compound ZrFe2, using the perturbed angular correlation of g ... -
Defects controlling electrical and optical properties of electrodeposited Bi doped Cu2O
(2018) [Artigo de periódico]Doping leading to low electrical resistivity in electrodeposited thin films of Cu2O is a straightforward requirement for the construction of efficient electronic and energy devices. Here, Bi (7 at. %) doped Cu2O layers ... -
Definition and design of strongly language disjoint checkers
(1988) [Artigo de periódico]This paper defines strongly language disjoint (SLD) checkers. SLD checkers are to sequential systems what strongly code disjoint checkers are to combinational systems. SLD checkers are the largest class of checkers with ... -
Deformações geométricas e velocidade superluminal aparentes em objetos em movimento relativístico
(2007) [Artigo de periódico]Neste trabalho, como continuação do trabalho de Ostermann e Ricci (Caderno Catarinense de Ensino de Física 19, 176 (2002)), analisamos as deformações geométricas aparentes de três objetos em movimento relativístico: uma ... -
Degradação e estabilização do diclofenaco em nanocápsulas poliméricas
(2004) [Artigo de periódico]The parameters which affect the degradation and stabilization of diclofenac in suspensions of nanocapsules and of the corresponding spray-dried powders were investigated. Formulations were subjected to 14 months of storage ... -
Degradação fotocatalítica do fungicida tebuconazole em solução aquosa
(2010) [Artigo de periódico]The tebuconazole photocatalytic degradation kinetics was studied in a batch reactor using TiO2 (P25-Degussa) as catalyst and a high pressure mercury lamp. The photolysis, adsorption and irradiation effects in the reaction ... -
Degradation of a transgressive coastal Dunefield by pines plantation and strategies for recuperation (Lagoa Do Peixe National Park, Southern Brazil)
(2021) [Artigo de periódico]The transgressive dunefield of the Lagoa de Peixe Natural Park was modified drastically due to intensive pine plantation and the leeward development of the associated degraded areas. The present study analyzed the disturbances ... -
Degrees of symmetry in quantum field theories
(1972) [Artigo de periódico]A hierarchy of possible symmetries in quantum field theory is defined, which reaches from a purely mathematical invariance to the conventional physical invariance, including the commonly discussed type of spontaneously ... -
De Haas-van Alphen oscillations and magnetic breakdown : semiclassical calculation of multiband orbits
(1998) [Artigo de periódico]We use an algebraic method to compute de Haas–van Alphen oscillations in two-dimensional systems in the semiclassical approximation for cases where the Fermi surface lies on more than one sheet of the energy surface. We ... -
A delimitação do conceito de representações escolares aplicada à educação em ciências
(2014) [Artigo de periódico]Neste texto realizaremos uma discussão acerca do conceito das representações escolares. Abordando o tema a partir de um ponto de vista teórico, buscaremos em exemplos da prática a legitimação e diferenciação do conceito ... -
Delimitação do terreno de marinha : estudo de caso no litoral do Rio Grande do Sul
(2015) [Artigo de periódico]Este trabalho apresenta um método híbrido de identificação de terrenos de marinha no litoral médio do Rio Grande do Sul - RS, utilizando dados geológicos coletados nas últimas décadas, informações maregráficas da Diretoria ...