Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 20 de 33
Filter
Add more filters










Type of study
Publication year range
1.
J Biomed Eng ; 14(4): 356-9, 1992 Jul.
Article in English | MEDLINE | ID: mdl-1513142

ABSTRACT

It is well known that normal physiological tremor of the fingers and alpha rhythm in the EEG, may share a common frequency band in the region of 10 Hz; that these two characteristics may be in some way related as a function of their frequencies, is a hypothesis which needs to be tested, as one element in establishing the physiology of physiological tremor. Bilateral occipital EEGs and simultaneous measurements of acceleration from the terminal phalanx of the middle finger of both hands were recorded from eight subjects. The data were analysed to produce power spectral densities and coherence functions, the latter being used to reveal the presence or absence of frequency elements common to both signals. No evidence was found that would support a hypothesis that the two characteristics were in any way frequency related, from which it can be inferred that the tremor is not under central control. In addition, tremor of the right and left hands does not show a synchronous relationship.


Subject(s)
Brain/physiology , Fingers/physiopathology , Tremor/physiopathology , Electroencephalography , Humans
2.
Comp Biochem Physiol B ; 88(2): 395-8, 1987.
Article in English | MEDLINE | ID: mdl-3427892

ABSTRACT

1. The serum lipoprotein pattern of water buffalo was studied by means of electrophoresis and the lipoproteins were isolated by ultracentrifugation on the basis of their hydrated density. 2. High density lipoproteins (HDL) showed a higher level of cholesterol than did the other lipoproteins. Moreover, the level of phospholipids was higher in HDL than in very low density lipoproteins (VLDL). 3. The buffalo B100 apoprotein was similar to that of man and rat. Three apoproteins similar to human apo E, apo AI and AII were found in buffalo HDL, buffalo VLDL contained essentially apo B protein.


Subject(s)
Buffaloes/blood , Lipoproteins/blood , Animals , Apolipoproteins/blood , Electrophoresis, Disc , Electrophoresis, Polyacrylamide Gel , Humans , Lipoproteins, HDL/blood , Lipoproteins, VLDL/blood , Male , Rats , Species Specificity
3.
J Biomed Eng ; 7(3): 247-50, 1985 Jul.
Article in English | MEDLINE | ID: mdl-4033100

ABSTRACT

The influence of sampling rate on the accuracy of measurements of various ECG parameters has been studied. Statistical analysis showed no significant difference between results obtained at sampling rates of 500 and 250 samples s-1. Recordings made at 125 samples s-1, however, showed significant reductions in peak amplitude values. Some interval measurements also varied significantly to both larger and smaller values. Other intervals did not seem to be affected significantly. It is concluded that a sampling rate of 125 samples s-1 could be used in particular conditions when only the measurement of certain intervals is required.


Subject(s)
Electrocardiography , Biomedical Engineering , Biometry , Humans
5.
Boll Soc Ital Biol Sper ; 56(7): 700-6, 1980 Apr 15.
Article in Italian | MEDLINE | ID: mdl-7448063

ABSTRACT

Authors studied the influence of pH changes on red blood cell deformability by means of filtration technique. In 0,9% NaCl solutions, there was decrease of RBC deformability upon both lowering and increasing of pH. In Teitel solutions, RBC deformability increased on alcalyne pH.


Subject(s)
Erythrocytes/cytology , Humans , Hydrogen-Ion Concentration , Osmolar Concentration , Sodium Chloride
6.
Boll Soc Ital Biol Sper ; 56(7): 693-9, 1980 Apr 15.
Article in Italian | MEDLINE | ID: mdl-7448062

ABSTRACT

Authors studied red blood cell filtrability by means of an original apparatus. The red blood cells were suspended in 0,9% NaCl and Teitel solutions. Teitel solution was the most usefullness in filtrability studies.


Subject(s)
Erythrocytes/cytology , Filtration/instrumentation , Filtration/methods , Humans
7.
Boll Soc Ital Biol Sper ; 56(4): 369-75, 1980 Feb 29.
Article in Italian | MEDLINE | ID: mdl-7248096

ABSTRACT

A rheographic evaluation of peripheral blood flow during isometric contraction (handgrip) has been done in 25 attendants of the Air Force Medical Service (mean age :20 years). The velocity of sphygmic wave, the sphygmic amplitude and, the peak time, heart rate and blood pressure have been measured at rest and during handgrip. The velocity of sphygmic wave does not change in all the subjects; the sphygmic amplitude is decreased of 10% (p less than .001), the peak time is decreased of 9% (p less than .001). Because sphygmic amplitude and peak time are directly proportional to flow volume, and their reduction significantly express a decrease of flow volume. The authors believe that the blood flow reduction is induced by the excitation of sympathetic peripheral alpha-receptors, not more balanced from sympathetic cholinergic vasodilator fibers. The actual result is an increase of the peripheral vascular resistances.


Subject(s)
Blood Circulation , Isometric Contraction , Physical Exertion , Plethysmography, Impedance , Adult , Blood Flow Velocity , Blood Pressure , Heart Rate , Humans , Pulse , Vascular Resistance
8.
Boll Soc Ital Biol Sper ; 55(24): 2635-41, 1979 Dec 30.
Article in Italian | MEDLINE | ID: mdl-553581

ABSTRACT

The estrogen receptors presence or absence in the thymus gland represents the basic element to assert or to exclude any estrogenic action in the thymus. Now we have measured the presence of cytoplasmatic estrogen receptors in the female rabbits thymus, using some methods (sucrose gradient, protamine sulphate, dextran-coated charcoal). Finally, we have investigated, using the sucrose gradient assay, the nuclear ER presence in 1000g thymic pellet. The results exclude high levels of estrogen-binding proteins while don't suggest their total absence in the female rabbit thymus.


Subject(s)
Receptors, Estrogen/analysis , Thymus Gland/analysis , Animals , Centrifugation, Density Gradient , Cytoplasm/analysis , Female , Rabbits
9.
Boll Soc Ital Biol Sper ; 54(23): 2374-7, 1978 Dec 15.
Article in Italian | MEDLINE | ID: mdl-756732

ABSTRACT

The AA studied the lipoproteins variations in the rat fed on a diet with a high content of a dietary fat and injected with a chromatographic fraction from a thymus homogenate of young calf. The diet induces in the animals considerable variations of the serum lipoproteins, while the thymus factor is able to bring back the lipoproteins to the normal per cent values.


Subject(s)
Dietary Fats/pharmacology , Lipoproteins/blood , Thymus Extracts/pharmacology , Animals , Male , Rats
SELECTION OF CITATIONS
SEARCH DETAIL
...