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The High Arctic summer with its permanent sunlight provides a situation in which one of the natural synchronizers, the light-dark alternation, is minimal. During the summers of 1981 and 1982 three healthy right-handed geographers who were performing field studies in Svalbard as part of their own research volunteered to document, 4-6 times per 24 hr for(More)
This paper presents a new approach to the estimation of epicardial potentials from measured body surface potentials. This problem is ill-posed, and regularization techniques, through incorporation of a priori information on the solution, provide an efficient way of improving the quality of the estimates. During a cardiac cycle, the time-evolution of the(More)
A number of serological tests were compared for the detection of antibodies to Brucella abortus in bison (Bison bison). The performance of the fluorescence polarization assay (FPA) in both the preliminary evaluation and a subsequent blind validation indicated that this test was the most suitable for serological diagnosis of brucellosis in bison. The(More)
ikahashi Kripke 73 ellerup and Ε. T. Mellerup 81 okac 87 1 Cell division cycles and circadian oscillators in Euglena Rhythmic circumnutation movement of the shoots in Phaseolus vulgaris L. Rhythms of locomotion and oxygen consumption in the estuarine amphipod Corophium volutator (Crustacea: Amphipoda) Role of autonomic nervous system in the time-dependent(More)
This paper presents a new approach to the estimation of epicardial potentials from measured body surface potentials. This problem is ill-posed, and regulariza-tion techniques, through incorporation of a priori information on the solution, provide an eecient way of improving the quality of the estimates. During a cardiac cycle, the time-evolution of the(More)
Spectral analysis of electrocardiographic signals has been proposed as a tool to detect features reflecting cardiac diseases, such as ventricular hypertrophy, myocardial infarction, and a predisposition to sustained ventricular tachycardia. The lack of a theoretical basis to address this question prompted the authors to undertake a simulation study using a(More)
Technical advances in the field of ultrasound have resulted in the development of a high resolution real-time B-mode imaging system that permits direct Doppler analysis of hemodynamic abnormalities. This system combines both anatomic information and physiological information which permits detailed analysis of the entire spectrum of disease occurring at the(More)
In order to study the origin of late potentials, their distribution was analyzed in 16 patients who had undergone surgery for arrhythmia due to ventricular tachycardia following myocardial infarction. The potentials were measured in sinus rhythm using 63 unipolar leads placed on the chest before the operation, then on the epicardium and endocardium during(More)
For investigation of late potentials seen on the signal-averaged electrocardiogram, intracardiac and thoracic distributions of terminal activity were analyzed in 16 patients undergoing cryosurgery for ventricular tachycardia after remote myocardial infarction. The body surface potentials measured with 63 time-averaged unipolar leads were compared with(More)