Results 11 to 20 of about 1,205 (217)

Modelo de suspensão pela cauda e seu efeito em algumas propriedades mecânicas do osso do rato Model of tail suspension and its effect in some mechanical properties of the rat bone

Acta Ortopédica Brasileira, 2004
A manutenção do metabolismo mineral normal dos ossos é um resultado de vários fatores inclusive das solicitações mecânicas que são aplicadas aos ossos pelas contrações musculares e pela força da gravidade.
Adriana Valadares da Silva, José Batista Volpon   +1 more
doaj   +1 more source

Ischemic Nephropathy in Newborns in Critical State (Clinical Picture, Diagnostics, Correction and Monitoring of Treatment Efficacy)

Zdorovʹe Rebenka, 2012
With a view of developing new methods for diagnostics and monitoring the effectiveness of treatment of ischemic nephropathy in newborns in neonatal intensive care units there was carried out a study of activity of alkaline phosphatase, γ ...
N.Yu. Kulikova, A.N. Mozhayeva, G.N. Kuzmenko, T.V. Chasha   +3 more
doaj   +1 more source

Validation of Material Algorithms for Femur Remodelling Using Medical Image Data

Applied Bionics and Biomechanics, 2017
The aim of this study is the utilization of human medical CT images to quantitatively evaluate two sorts of “error-driven” material algorithms, that is, the isotropic and orthotropic algorithms, for bone remodelling. The bone remodelling simulations were
Shitong Luo, Xingquan Shen, Xin Bai, Jing Bai, Jianning Han, Yu Shang   +5 more
doaj   +1 more source

Motion control research of underwater spherical robot

Systems Science & Control Engineering, 2018
Underwater spherical robot motion control can be used to simulate satellite motion control under weightlessness. In this paper, firstly the motion equation of spherical robot is established by force analysis.
Peilong Li, Lei Wang, Wenwen Zhang
doaj   +1 more source

Dry Immersion as a Ground-Based Model of Microgravity Physiological Effects

Frontiers in Physiology, 2019
Dry immersion (DI) is one of the most widely used ground models of microgravity. DI accurately and rapidly reproduces most of physiological effects of short-term space flights.
Elena Tomilovskaya, Tatiana Shigueva, Dimitry Sayenko, Ilya Rukavishnikov, Inessa Kozlovskaya   +4 more
doaj   +1 more source

Weightlessness and cardiac rhythm disorders: current knowledge from space flight and bed-rest studies

Frontiers in Astronomy and Space Sciences, 2016
Isolated episodes of heart rhythm disorders have been reported during 40 years of space flight, triggering research to evaluate the risk of developing life-threatening arrhythmias induced by prolonged exposure to weightlessness.
Enrico Gianluca Caiani, Alba Martin-Yebra, Alba Martin-Yebra, Federica Landreani, Juan Bolea, Juan Bolea, Pablo Laguna, Pablo Laguna, Pierre Vaïda   +8 more
doaj   +1 more source

Microgravity simulation by diamagnetic levitation: effects of a strong gradient magnetic field on the transcriptional profile of Drosophila melanogaster

BMC Genomics, 2012
Background Many biological systems respond to the presence or absence of gravity. Since experiments performed in space are expensive and can only be undertaken infrequently, Earth-based simulation techniques are used to investigate the biological ...
Herranz Raul, Larkin Oliver J, Dijkstra Camelia E, Hill Richard JA, Anthony Paul, Davey Michael R, Eaves Laurence, van Loon Jack JWA, Medina F Javier, Marco Roberto   +9 more
doaj   +1 more source

Comportamento mecânico do terço proximal de fêmures de ratos após período de suspensão pela cauda e exercitação Mechanical behavior of rats' femoral proximal thirds after a period of tail suspension and exercises

Acta Ortopédica Brasileira, 2007
A remodelação óssea pode ser estimulada por forças mecânicas presentes nas atividades físicas normais. Neste trabalho foi analisado o comportamento mecânico do terço proximal de fêmur de ratas submetidas à suspensão pela cauda e posterior treinamento em ...
Marcos Massao Shimano, José Batista Volpon   +1 more
doaj   +1 more source

Time after time – circadian clocks through the lens of oscillator theory

FEBS Letters, EarlyView.
Oscillator theory bridges physics and circadian biology. Damped oscillators require external drivers, while limit cycles emerge from delayed feedback and nonlinearities. Coupling enables tissue‐level coherence, and entrainment aligns internal clocks with environmental cues.
Marta del Olmo, Carolin Ector, Hanspeter Herzel   +2 more
wiley   +1 more source

Background for modeling the dynamic characteristics of advanced spacecraft drives considering the operation of oscillators

Advanced Engineering Research, 2019
Introduction. Precision elements of the target equipment and sensitive elements of the stabilization and orientation system of the advanced spacecraft are considered in the framework of this research.
A. N. Sova, M. I. Stepanov, V. A. Sova, A. I. Bykov   +3 more
doaj   +1 more source