Optic Density
Mostrando 13-24 de 43 artigos, teses e dissertações.
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13. Humoral immune responses induced by Kudoa sp. (Myxosporea: Multivalvulida) antigens in BALB/c mice
The majority of Kudoa species infect the somatic muscle of fish establishing cysts. As there is no effective method to detect infected fish without destroying them these parasited fish reach the consumer. This work was developed to determine whether this parasite contains antigenic compounds capable of provoking an immune response in laboratory animals, in o
Memórias do Instituto Oswaldo Cruz. Publicado em: 2002-12
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14. Effect of chemical and anatomic characteristics on wood basic density and on pulp quality of Eucalyptus grandis x urophyla hybrid clones / Efeito das características anatômicas e químicas na densidade básica da madeira e na qualidade da polpa de clones hibridos de Eucalyptus grandis x urophylla
This study aimed to evaluate the effect of the chemical and anatomic characteristics on wood density and on physical- mechanical properties of eucalyptus kraft pulp. Two eucalyptus clones with different basic densities (450 and 550 kg/m) were studied. For each clone, a disk was removed from the trunk at 50% commercial height and sample was taken from this di
Publicado em: 2002
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15. Avaliação clinica e radiografica da regeneração tecidual guiada no tratamento de lesões de bifurcação classe II. Estudo em humanos
The present study was designed to compare, clinically and radigraphically, the treatment of class II mandibular molar furcation defects with guided tissue regeneration (GTR) using GUIDOR@ membranes (test group) dr open flap debridement (control group). The sample consisted of 19 furcation defects in mandibular molars, in 9 patients. In each patient, the furc
Publicado em: 1999
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16. Uma contribuição a minimização de jitter acustico em sistemas solitonicos
As the transmission rates of fiber optic systems increase, effects arising from fiber nonlinearities need to be taken into account in analises and simulations. For high rate systems (10-20 Gbps per channel) with large spacings between amplifiers, high intensity optical pulses, capable of exciting the nonlinearities, are required so that adequate signal to no
Publicado em: 1999
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17. Caracterização de uma armadilha magneto-optica para átomos de sódio em célula de vapor. / Characterization of a magneto-optical trap for sodium atoms in vapor cell.
Among the various atomic motion control techniques using radiation pressure magneto-optic trapping has been looked at with great enthusiasm because it produces samples of cold atoms (temperatures about μK), with high densities and confined in small regions of space. Due to these motivations the efforts for developing and characterizing these atoms traps
Publicado em: 1994
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18. Caracterização eletrica de camadas epitaxiais de In 0,53 Ga 0,47 AS/In P:Fe
The resistivity and Hall coefficient of n-In0.53Ga0.47As epitaxial films grown on InP:Fe semi-isolating temperatures in the range 4.2-300 K. The Hall mobility mH experimentally determined cannot be measured without the application of magnetic fields, while the calculated mobility is usually the effective or drift mobility (m). To correlate mH with m , one us
Publicado em: 1991
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19. Low density of sodium channels supports action potential conduction in axons of neonatal rat optic nerve.
The density of sodium channels in premyelinated axons was estimated from measurements of the binding of [3H]saxitoxin to neonatal rat optic nerve. The maximum saturable binding capacity of the nerve was 16.2 +/- 1.2 fmol/mg of wet weight, with an equilibrium dissociation constant of 0.88 +/- 0.18 nM (mean +/- SEM). These values correspond to a high-affinity
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20. Postnatal development of the optic nerve in (C57BL x CBA)F1 hybrid mice: general changes in morphometric parameters.
A morphometric analysis of the optic nerve in different age groups of (C57BL x CBA)F1 hybrid mice was carried out. Morphometric parameters examined were mean nerve cross-sectional area (csa), mean myelinated nerve fibre count, mean myelinated nerve fibre density and myelinated nerve fibre size distribution. The findings revealed that the optic nerve continue
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21. Optic disc neovascularisation in diabetic retinopathy: I. A system for grading proliferation at the optic nerve head in patients with proliferative diabetic retinopathy.
An anatomical taxonomy for neovascular proliferation of the optic nerve head in patients with proliferative diabetic retinopathy is presented. The technique consists in comparing (A) number of involved quadrants, (B) calibre of vessels, (C) neovascular density, (D) neovascular area, (E) plane of proliferation, and (F) fluorescein angiographic findings. A sim
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22. Myelinated axon number in the optic nerve is unaffected by Alzheimer's disease.
AIMS/BACKGROUND--Visual symptoms are a common but not invariable feature of Alzheimer's disease (AD) and such symptoms appear to become more pronounced as the severity of the dementia increases. Pathology in both the pregeniculate and cortical parts of the visual system has been suggested to underlie the visual deficits in AD. In order to investigate the for
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23. Vascular and neural changes in the rat optic nerve following induction of diabetes with streptozotocin.
This study was undertaken to determine whether or not changes occur in blood vessels, axons or glia of the optic nerve as the result of streptozotocin-induced diabetes. Diabetes was induced in 4 weeks old Sprague-Dawley rats. At 12 and 16 weeks of age, the rats were killed and the optic nerves prepared for examination. The number and density of blood vessels
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24. Reduced sodium channel density, altered voltage dependence of inactivation, and increased susceptibility to seizures in mice lacking sodium channel β2-subunits
Sodium channel β-subunits modulate channel gating, assembly, and cell surface expression in heterologous cell systems. We generated β2−/− mice to investigate the role of β2 in control of sodium channel density, localization, and function in neurons in vivo. Measurements of [3H]saxitoxin (STX) binding showed a significant reduction in the level of plas
National Academy of Sciences.