Search Results
Results 401 - 450 of 494
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Park P C - - 1991
Nuclear rotation (NR) refers to the motion of chromatin domains in interphase nuclei of several cell types, including neurons, in vitro. It has been proposed that NR may function, during cellular differentiation, in the transposition of specific chromatin domains into the cytotypic chromosome pattern known to exist in interphase nuclei. ...
Choi S - - 1991
English and Korean differ in how they lexicalize the components of motion events. English characteristically conflates Motion with Manner, Cause, or Deixis, and expresses Path separately. Korean, in contrast, conflates Motion with Path and elements of Figure and Ground in transitive clauses for caused Motion, but conflates motion with Deixis ...
Werkhoven P - - 1991
A stroboscopically presented revolving annulus composed of dots is used to elicit rotary motion perception. Observers judge the direction of rotary motion. We find sharp and gradual transitions in the probability for reversed motion perception as a function of the angle of rotation between successive frames. These transitions reveal that ...
Takai S - - 1991
This study was designed to determine the effects of frequency and duration of controlled passive motion on the healing flexor tendon following primary repair. Adult mongrel dogs were divided into two groups based on frequency of controlled passive motion. In one group, motion was applied manually at a frequency of ...
Noonan K J - - 1991
This study retrospectively analyzes primary flexor pollicis longus repairs. Ninety-four patients were identified and had extensive chart review. Thirty patients returned for follow-up (mean of 6.8 years) interview, range of motion, and strength testing. At follow-up, interphalangeal active range of motion, metacarpophalangeal active range of motion, and carpometacarpal active range ...
Ryu J Y - - 1991
We have examined 40 normal subjects (20 men and 20 women) to determine the ideal range of motion required to perform activities of daily living. The amount of wrist flexion and extension, as well as radial and ulnar deviation, was measured simultaneously by means of a biaxial wrist electrogoniometer. The ...
Woolbright J L - - 1991
The range-of-motion box enables the operator to visualize how to carry a joint through extremes of motion range for range-of-motion evaluations and to locate the position of comfort in relaxation of tender points. It is helpful for teaching the novice counterstrain manipulation and for instructing fellow practitioners. Examples are illustrated ...
De Troyer A - - 1991
To assess the relative contributions of the different groups of inspiratory intercostal muscles to the cranial motion of the ribs in the dog, we have measured the axial displacement of the fourth rib and recorded the electromyograms of the parasternal intercostal, external intercostal, and levator costae in the third interspace ...
Hammarström E - - 1991
Triscupid annular motion is related to right ventricular systolic function in the same way mitral annulus motion is related to left ventricular function. Tricuspid annular excursion reflects the longitudinal motion of the right ventricle, and the systolic descent of the anulus correlates with systolic venous inflow to the right atrium. ...
Wan C Z - - 1991
By comparison of the time dependence of linear dichroism and transient absorption in light-adapted bacteriorhodopsin over the first 10 microseconds following excitation, conformational motion in the protein has been detected. Time-resolved linear dichroism and transient absorption scans are reported for several wavelengths that probe the K610 and L550 intermediates in ...
Bohannon R W - - 1991
This project was funded, in part, by the Research Foundation, University of Connecticut, Storrs, CT 06269-2101. The purpose of this study was to document and compare, using surface landmarks, the magnitude of forefoot and hindfoot motion accompanying passive ankle dorsiflexion range of motion (ADROM). Twenty-two healthy subjects had their right ...
Thompson P A - - 1990
Molecular dynamics simulations of atomically thin, fluid films confined between two solid plates are described. For a broad range of parameters, a generic stick-slip motion is observed, consistent with the results of recent boundary lubrication experiments. Static plates induce crystalline order in the film. Stick-slip motion involves periodic shear-melting transitions ...
Freeman D M - - 1990
Vertebrates sense sound, orientation, and motion by means of bundles of microscopic sensory hairs that protrude from the surfaces of receptor (hair) cells. To determine the effects of the sensory epithelium, tectorial structures, and fluids on the motions of hair bundles, we examine a class of mathematical models in which ...
Zeman R K - - 1990
In vitro experiments in an anthropomorphic phantom were performed to clarify the relationship between stone motion, targeting, and fragmentation. Stone motion was minimized by pinning the stone against the dependent wall of a mock gallbladder cavity during shock wave treatment. Fragmentation was most effective (probably due to increased cavitation effects) ...
Parmentier J C - - 1990
This article attempts to demonstrate that by means of a single vertical axis rotary chair, motion stimuli can be selectively presented to any one pair of sensors in the labyrinths of the vestibular peripheral end organs, to the exclusion of the others by means of appropriate motion profiles and coupling ...
Brandes R - - 1990
As part of an effort to explore the nature of the internal motion in solid polynucleotides, the spectral densities of motion J1(omega 0) and J2(2 omega 0) have been measured for oriented, partially hydrated samples of calf thymus Li-DNA deuterated in the guanine and adenine 8-positions. Both spectral densities increase ...
Mess D - - 1990
Forty-seven hips in 38 patients with femoral head osteonecrosis were reviewed for a mean follow-up period of 2.6 years. The average preoperative Harris hip score was 24.7; postoperatively, the average score was 84.5. Cineroentgenographic motion studies were carried out on 14 hips and revealed motion at both the inner and ...
Feehan L M - - 1990
This study compared the effects of postoperative immobilization and early controlled passive motion on tensile properties of healing chicken flexor tendons during the initial 30 postoperative days. Results indicate (1) that controlled passive motion tendons had significantly greater values for rupture load, stress, and energy absorbed; (2) that both groups ...
Bredenkamp-Herrmann D - - 1990
Study completed in partial fulfillment of requirements for Master of Health Sciences Degree, Physical Therapy, Washington University, St. Louis, MO. Physical therapists measure head and neck flexion-extension with goniometers, assuming that such measures are an accurate appraisal of joint motion. The only universally accepted, reliable, and objective method of measuring ...
Clark B A - - 1990
A method of calibrating photodiode measurements of cell motion is described. A transparent glass plane is inserted perpendicular to the light path, in front of the photodiode. When the glass plane is rotated, changing the angle between the plane and the light path, the image is displaced. The rotatable glass ...
Peng Z Y - - 1989
In an extension of our earlier work (Peng, Z.-y., V. Simplaceanu, I. J. Lowe, and C. Ho. 1988. Biophys. J. 54:81-95), the rotating-frame nuclear spin-lattice relaxation (T1 rho) technique has been used to investigate the slow molecular motions (10(-4) - 10(-6) s) in lipid bilayers prepared from protonated or perdeuterated ...
Garcia-Elias M - - 1989
Two limited intercarpal fusions, scapho-trapezial-trapezoidal and scapho-capitate, were simulated in six fresh human cadaver wrists by means of two Herbert screws. By use of a biplanar radiographic measurement system, the relative kinematic behavior of selected carpal bones, before and after the simulated limited fusions could be analyzed. Both scapho-trapezial-trapezoidal and ...
Nguyen T C - - 1989
Studying motion in the gastrointestinal (G.I.) tract is the first step towards our goal of designing a digital algorithm for real-time noise and motion blurring reduction by temporal and spatial averaging in x-ray fluoroscopy. The present work concerns the types of motion relevant to G.I. fluoroscopy (e.g., motion of the ...
Cape E G - - 1989
In patients with hypertrophic cardiomyopathy, the mitral valve moves anteriorly and assumes a unique shape, with mitral-septal contact centrally and preserved valve orifice area laterally. This shape is not clearly predicted by the Venturi mechanism, which stresses flow above the valve as opposed to changes intrinsic to the valve. On ...
Allen M E - - 1988
Accurate measurement of the motions and strength of the trunk is limited by landmarks that rarely remain constant, a shifting axis of rotation, and the dual roles of muscles that act as both extensors and flexors. This paper will review the growing number of devices that can assist the clinician ...
Sussman G J - - 1988
The Digital Orrery has been used to perform an integration of the motion of the outer planets for 845 million years. This integration indicates that the long-term motion of the planet Pluto is chaotic. Nearby trajectories diverge exponentially with an e-folding time of only about 20 million years.
David D R - - 1988
Range of motion of the lower extremity joints from the hip to the digits will be discussed including both active and passive axis of motion and their planes of motion. The author believes that the interpretation of these ranges of motion is essential in order to properly diagnose and to ...
Petherick M - - 1988
The purposes of this study were 1) to establish the concurrent validity of the universal goniometer and the fluid-based goniometer and 2) to determine the intertester reliability of these two instruments. A correlational study was performed in which two testers used the universal goniometer and the fluid-based goniometer in measuring ...
Palmer J B - - 1988
The motions of the posterior pharyngeal wall during swallowing were studied in four asymptomatic males using a new method for videoradiography. Radiopaque markers of 4 mm diameter were affixed to the pharyngeal wall by suction. Ventrodorsal and axial components of motion were measured frame by frame. Large axial motions occurred ...
O'Driscoll S W - - 1988
An autogenous graft of tibial periosteum was sutured (with its cambium layer facing into the joint) to the base of a five by ten-millimeter full-thickness defect in the patellar groove of each of forty-five adolescent rabbits. The rabbits were randomly treated postoperatively by either four weeks of immobilization in a ...
Breuer A C - - 1988
Moving intra-axonal organelles demonstrate frequent variations in speed when viewed over several seconds. To evaluate these and other motion variations, a long-term analysis of organelle motion in isolated axoplasm of Myxicola infundibulum was carried out using differential interference contrast optics and analog and digital image enhancement techniques. Motion characteristics of ...
Goodman S - - 1987
We reviewed early and late motion changes of the hip in 102 hemophiliacs with a mean follow-up of 7 years. Sixty patients (59%) had at least one hip bleed. Sixty-four hips in 49 patients demonstrated at least a 15 degree change in range of motion (ROM) at some time. At ...
Meyerdierks E M - - 1987
By means of an external fixator, 11 limited wrist "fusions" in eight freshly frozen cadaver wrists were studied. An electrogoniometer measured perfusion and postfusion range of motion, and the percentage of loss of motion was determined and then averaged for all eight wrists. The three fusions that crossed the radiocarpal ...
Kriwisky M - - 1987
Mitral leaflet motion during systole was studied by echocardiography in 102 healthy young men. Mean posterior maximal leaflet motion was 2 +/- 1 mm behind the CD line on 2-dimensionally (2-D) directed M-mode examination. On the apical 4-chamber cross-sectional view a mean area of 0.34 +/- 0.24 mm2 was contained ...
Bentham J S - - 1987
Prototypes have been designed and manufactured for a lightweight portable device which continually moves all the joints of the hand passively through a range of motion. Inflatable bag modules in the palm of the hand are ganged together to create the required range of motion. A battery-operated air pump cycles ...
Martin E A - - 1986
This paper describes a research program conducted to determine the feasibility of providing useful angular onset-motion information via a broad-area tactual seat-pan display. The experiment was designed to evaluate the utility of the display as a training device as well as its efficacy for imparting motion information. The results indicate ...
De Boni U - - 1986
The term "nuclear rotation" refers to a motion of nucleoli within interphase nuclei of several cell types. No mechanism or function has been ascribed to this phenomenon, and it was unknown whether nuclear structures in addition to nucleoli participate in this motion. Moreover, it was unclear whether nuclear rotation occurs ...
Brizzee K R - - 1986
Three previously motion-emetic sensitive squirrel monkeys were rendered refractory to a standard motion-emetic regimen by a two-stage utriculosacculectomy procedure which preserved the cristae ampullares of semicircular canals. Three non-operated control squirrel monkeys tested on the same motion-emetic regimen time schedule as the operated animals remained motion-emetic sensitive with regard to ...
Anderson J G - - 1986
The network of strong motion accelerographs in Mexico includes instruments that were installed, under an international cooperative research program, in sites selected for the high potenial of a large earthquake. The 19 September 1985 earthquake (magnitude 8.1) occurred in a seismic gap where an earthquake was expected. As a result, ...
Hatze H - - 1986
The concept of motion variability is discussed and a normalized measure for its quantification is introduced. An example demonstrates that this new measure constitutes a global indicator of the current state of a motor learning process. The causes of motion variations are briefly discussed. They include initial perturbations of the ...
Dederich D N - - 1986
A potential problem with the use of rotary engine-driven files to flare canals is metal fatigue and subsequent breakage. This study analyzes the effects of cyclical axial motion on instrument failure by fatigue testing of endodontic files with and without cyclical axial motion. Eighteen new instruments, sizes 15 to 45, ...
McCarthy J A - - 1986
A model was developed to evaluate continuous passive motion as an adjunct to tenolysis. The use of continuous passive motion after tenolysis was associated with a significant increase in tendon rupture and the terminal force necessary to flex the phalanx actively. Also, there was a decrease in the passive range ...
Solgaard S - - 1986
The wrist motion in 31 healthy probands was measured by four observers with a simple goniometer under standardized conditions. The INTRA-observer variation was calculated to 5 to 8 degrees and the INTER-observer variation to 6 to 10 degrees. No difference between experienced and non-experienced observers was found. The difference between ...
Rock I - - 1986
Although the optomotor response in animals and induced motion of the self in humans occur under very similar stimulus conditions, they have not hitherto been related. Experiments with fish are reported which support the hypothesis that the optomotor response is based on the animal's attempt to nullify the unwanted experience ...
Kaiser M K - - 1985
Recent studies have shown that many people demonstrate erroneous beliefs about motion when asked to predict the trajectories of objects. The present experiments examine whether people can select as correct natural trajectories over anomalous ones when presented with the actual on-going event (motion condition) or static representations of the event ...
Gilad I - - 1985
This study was designed to evaluate motion patterns of individuals with upper extremity amputations while performing a manual task. The objectives were to analyze performance time of repeatable motion elements that constituted the locomotion of upper extremity amputees, and to develop the performance profile which could be used as an ...
McKenna O C - - 1985
The postnatal development of two avian brain areas, the nucleus of the basal optic root (nBOR) and the lentiform nucleus of the mesencephalon (LM), was studied using the 2-deoxy-D-glucose (2-DG) method. Previous studies have shown that these nuclei respond to whole field visual motion, which is used for optokinetic eye ...
Wongchaisuwat C - - 1984
The planar motion of the human knee joint is modeled, involving the relative motion of the geometry of the contacting surface between the tibia and the femur. The pure gliding motion and the pure rolling motion are formulated including the holonomic and nonholonomic constraints that must be satisfied. A control ...
Ito Y - - 1984
Hydrodynamic distribution of two-phase solvent systems in a rotating helical column subjected to centrifugal fields produced by two different types of synchronous planetary motion has been studied by the use of the combined horizontal flow-through coil planet centrifuge. With continuous elution of the mobile phase, the simpler type of motion ...
Maher J - - 1984
A quantitative microcinematographic technique for the measurement of cellular motion in response to chemical influences is described. The data are analyzed by using a magnetic digitizer connected to a computer, permitting comparison of several characteristics of such motion. When human granulocytes are placed in a gradient of formyl-methionyl-leucyl-phenylalanine (fMLP) (concentration ...
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