نتایج جستجو برای: conduction

تعداد نتایج: 38176  

Journal: :Circulation 1973
R M Schuilenburg D Durrer

SUMMARY In eleven patients in whom atrial premature stimulation elicited functional block in the conduction system distal to the atrioventricular (A-V) node, the influence of atrial driving rate was studied. Functional conduction disturbances in the left bundle branch-Purkinje system were produced by driving the atria at a rate just above the spontaneous sinus rate and by introducing premature ...

Journal: :Journal of neurology, neurosurgery, and psychiatry 1959
P K THOMAS T A SEARS R W GILLIATT

Although measurements of nerve conduction velocity in man were first made nearly a hundred years ago, the procedure was not used clinically until 1948 when Hodes, Larrabee, and German reported reduced conduction velocity in regenerating motor nerves. Later, Hodes (1949) described slow conduction in surviving nerve fibres after poliomyelitis, and more recently it has been shown that conduction m...

Journal: :acta medica iranica 0
saeid farahani department of audiology , school of rehabilitation, tehran university of medical sciences,tehran,iran. masoud motasaddi zarandy department of otolaryngology, school of medicine, tehran university of medical sciences, tehran, iran. and ent research center, tehran university of medical sciences, tehran, iran. gholamreza hassanzadeh department of anatomy, school of medicine, tehran university of medical sciences, tehran, iran. farzad shidfar school of health, iran university of medical sciences, tehran, iran. shohreh jalaie department of biostatistics, school of rehabilitation, tehran university of medical sciences, tehran, iran. vida rahimi department of audiology, school of rehabilitation, tehran university of medical sciences, tehran, iran.

the biological effects of omega-3 and omega-6 fatty acids are determined by their mutual interactions. this interaction extremely affects various functions. lower consumption of omega-3 during gestation leads to various disorders, even in hearing. we aimed to assess the effect of low omega-3/omega-6 ratios on auditory nerve conduction. in this experimental study, the auditory brainstem response...

Journal: :علوم و تکنولوژی پلیمر 0
الهه مسایلی صدیقه برهانی

low temperature plasma technology is well established in surface modification of polymer materials on industrial scale. this method modifies surface properties of polymers without chemicals, manual work and reducing chemicals and energy consumption. in this study, low pressure plasma treatment was used to develop hydrophilic properties of polyethylene terephthalate (pet) fabrics. it was found t...

‎A natural algorithm with an optimal order of convergence is proposed for numerical solution of a class of cordial weakly singular Volterra integral equations‎. ‎The equations of this class appear in heat conduction problems with mixed boundary conditions‎. ‎The algorithm is based on a representation of the solution and compound Gaussian quadrature rules with graded meshes‎. ‎A comparative stud...

In this paper, the non-Fourier heat conduction in a semi-infinite body was examined. The heat wave non-Fourier heat conduction model was used for thermal analysis. Thermal conductivity was assumed temperature-dependent which resulted in a non-linear equation. The heat source was also considered temperature-dependent which resulted in a non-homogeneous equation. The Mac-Cormack predictor-correct...

Journal: :journal of heat and mass transfer research 0
mohammad sadegh motaghedi barforoush semnan university syfolah saedodin faculty of mechanical engineering, semnan university, iran

small scale thermal devices, such as micro heater, have led researchers to consider more accurate models of heat in thermal systems. moreover, biological applications of heat transfer such as simulation of temperature field in laser surgery is another pathway which urges us to re-examine thermal systems with modern ones. non-fourier heat transfer overcomes some shortcomings of fourier heat tran...

Journal: :iranian journal of science and technology (sciences) 2015
gh. safarpour

the effects of conduction band nonparabolicity, aluminum concentration and external electric field on the charge density and binding energy of an on-center hydrogenic donor impurity in a spherical quantum dot which is located at the center of a cylindrical nano-wire are studied. the energy eigenvalues and the corresponding wave functions are calculated using finite difference approximation with...

Journal: :Cardiovascular research 2012
Nima Badie James A Scull Rebecca Y Klinger Ava Krol Nenad Bursac

AIMS Structural and functional heterogeneities in cardiac tissue have been implicated in conduction block and arrhythmogenesis. However, the propensity of specific sites within the heart to initiate conduction block has not been systematically explored. We utilized cardiomyocyte cultures replicating the realistic, magnetic resonance imaging-measured tissue boundaries and fibre directions of ven...

Journal: :Circulation 1998
S A Thomas R B Schuessler C I Berul M A Beardslee E C Beyer M E Mendelsohn J E Saffitz

BACKGROUND Myocardial conduction depends on intercellular transfer of current at gap junctions. Atrial myocytes express three different gap junction channel proteins-connexin43 (Cx43), connexin45 (Cx45), and connexin40 (Cx40)-- whereas ventricular myocytes express only Cx43 and Cx45. However, the physiological roles of individual connexins are unknown. We have previously shown that mice heteroz...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید