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  • 1980-1984  (14)
  • 1975-1979  (11)
  • 1965-1969  (2)
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  • 11
    Digitale Medien
    Digitale Medien
    Variation of the speckle contrast in a graded-index fibre by misalignment of the incident beam (1984)
    Springer
    Optical and quantum electronics 16 (1984), S. 9-18 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The speckle pattern observed at the output end of a multimode fibre is closely related to the modal noise. In this paper, the average contrast of the speckle pattern is studied as a function of the radial position in the output end plane for three kinds of misalignment of the incident beam, i.e. defocusing, axial misalignment and angular misalignment. It is found that a variation of the speckle contrast is very sensitive to all kinds of misalignment of the incident beam and that its varying form strongly depends on the kind of misalignment of the incident beam. The speckle contrast at the centre of the output end plane is also examined as a function of the magnitude of misalignment. It is found that the contrast increases from a minimum value in the correct alignment to a certain saturated value with an increase of misalignment.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619872
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  • 12
    Digitale Medien
    Digitale Medien
    Variation of the speckle patterns in graded-index fibres with a misaligned joint (1984)
    Springer
    Optical and quantum electronics 16 (1984), S. 197-205 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The intensity variation of a speckle pattern on the exit end face of graded-index multimode fibres with a misaligned fibre-to-fibre joint is experimentally studied from its first-order statistics of the average contrast and the probability density function for two different kinds of longitudinal and axial misalignments. It is found that the speckle contrast varies as a function of the radial position with a peak which shifts towards the periphery of the speckle pattern with an increase of the joint loss. A varying form of the speckle contrast also depends on the type of misalignment. The probability density function of the speckle intensity variation is also found to vary as a function of the radial position but to scarcely vary as a function of the joint loss.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619374
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  • 13
    Digitale Medien
    Digitale Medien
    Intracranial pressure in patients with diffuse cerebral arterial spasm following ruptured intracranial aneurysms (1978)
    Springer
    Acta neurochirurgica 44 (1978), S. 81-95 
    Details
    ISSN: 0942-0940
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Intracranial pressure (ICP) was recorded continuously in 12 pre-operative patients with angiographic evidence of diffuse cerebral arterial spasm due to a ruptured intracranial aneurysm. Recordings were made for 1 to 7 days, starting within 13 days after the haemorrhage. 1. An increased ICP was observed in the first week after subarachnoid haemorrhage (SAH) in 4 of the patients without any signs of angiographic arterial spasm. 2. This initial increase was regularly followed by a depression of ICP in between 7–12 days after SAH. In 11 out of 12 patients such a depression was concomitant with the beginning of arterial spasm. During the period of depressed ICP pattern, 6 patients showed little or no neurological deterioration, whereas 5 patients showed impaired consciousness or neurological deficits. 3. A secondary rise of ICP thereafter always followed due to ischaemic brain swelling or infarction, and was usually associated with a serious neurological deterioration. 4. Continuous ventricular drainage was performed to control the secondary increased ICP in 7 patients who survived, 4 of them with good clinical improvement and 3 with severe neurological deficits. 5. In the stage of depressed ICP, the administration of isoproterenol and steroids is recommended in order to try to alleviate the secondary rise of ICP.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01401632
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  • 14
    Digitale Medien
    Digitale Medien
    Glucose 6-Phosphate dehydrogenase variants: A unique variant (G6PD Kobe) showed an extremely increased affinity for galactose 6-phosphate and a new variant (G6PD Sapporo) resembling G6PD Pea Ridge (1981)
    Springer
    Human genetics 〈Berlin〉 58 (1981), S. 405-407 
    Details
    ISSN: 1432-1203
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Two new glucose 6-phosphate dehydrogenase (G6PD) variants associated with chronic nonspherocytic hemolytic anemia were discovered. G6PD Kobe was found in a 16-year-old male associated with hemolytic crisis after upper respiratory infection. The enzyme activity of the variant was about 22% of that of the normal enzyme. The main enzymatic characteristics were slower than normal anodal electrophoretic mobility, high Km G6P, increased thermal-instability, an acidic pH optimum, and an extremely increased affinity for the substrate analogue, galactose 6-phosphate (Gal-6P). G6PD Sapporo was found in a 3-year-old male associated with drug-induced hemolysis. The enzyme activity was extremely low, being 3.6% of normal. In addition, this variant showed high Ki NADPH and thermal-instability. G6PD Kobe utilized the artificial substrate Gal-6P effectively as compared with the common natural substrate, glucose 6-phosphate. In G6PD Sapporo, NADPH could not exert the effect of product inhibition. The structural changes of these variants are expected to occur at the portions inducing conformational changes of the substrate binding site of the enzyme.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00282823
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  • 15
    Digitale Medien
    Digitale Medien
    Gd(-) Gifu and Gd(-) Fukuoka. Two new variants of glucose-6-phosphate dehydrogenase found in Japan (1984)
    Springer
    Human genetics 〈Berlin〉 66 (1984), S. 276-278 
    Details
    ISSN: 1432-1203
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Two new glucose-6-phosphate dehydrogenase (G6PD) variants were discovered in Japan. The first, found in a 9-year-old male, was associated with chronic hemolysis and hemolytic crises after upper respiratory infections. The enzyme activity of the variant was 2.9% of normal. The patient's G6PD showed an increased utilization of substrate analogue, deamino-NADP, and thermal instability. The second variant occurred in a 7-year-old male with druginduced hemolysis. The main enzymatic characteristics were reduced enzyme activity, being 6.4% of normal, faster-thannormal anodal electrophoretic mobility, slightly high Michaelis constant for glucose-6-phosphate, thermal instability, and biphasic pH optima. Enzymatic properties of these variants allowed each to be distinguished from previously reported variants. The first variant was designated Gd (-) Gifu and the other, Gd (-) Fukuoka.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00286616
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  • 16
    Digitale Medien
    Digitale Medien
    A new glucose-6-phosphate dehydrogenase variant (G6PD Nagano) associated with congenital hemolytic anemia (1982)
    Springer
    Human genetics 〈Berlin〉 62 (1982), S. 368-370 
    Details
    ISSN: 1432-1203
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary A new glucose-6-phosphate dehydrogenase (G6PD) variant associated with chronic nonspherocytic hemolytic anemia was reported. The patient, a 6-year-old Japanese male, was noticed to have hemolytic anemia soon after birth, and a diagnosis of G6PD deficiency was made at the age of 2. He had episodes of hemolytic crisis several times after upper respiratory infection. G6PD activity of the patient was 5.5% of normal. The enzymatic characteristics were examined when he was 5 years old, and his G6PD showed faster-than-normal electrophoretic mobility, low Km G6P, high Km NADP, low Ki NADPH, normal utilization of substrate analogues, heat instability, and a normal pH optimum curve. From these results, this was considered to be a new variant and was designated G6PD Nagano. Infection-induced hemolysis and chronic hemolytic anemia seem to be due to markedly impaired enzyme activity and thermal instability.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00304560
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  • 17
    Digitale Medien
    Digitale Medien
    G6PD Sendagi: A new glucose-6-phosphate dehydrogenase variant associated with congenital hemolytic anemia (1983)
    Springer
    Human genetics 〈Berlin〉 65 (1983), S. 214-215 
    Details
    ISSN: 1432-1203
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary A new glucose-6-phosphate dehydrogenase (G6PD) variant associated with chronic nonspherocytic hemolytic anemia was discovered. It was found in a 2-year-old male who had a hemolytic crisis after an upper respiratory tract infection. The enzyme activity of the variant was 8.4% of that of the normal enzyme. The enzymatic characteristics were slower than normal anodal electrophoretic mobility, low Km G6P, normal Km NADP, increased utilization of substrate analogues, high Ki NADPH, decreased heat stability, and an alkaline pH optimum. From these results, this was considered to be a new variant and was designated G6PD Sendagi.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00286669
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  • 18
    Digitale Medien
    Digitale Medien
    Statistical dependency as a measure to evaluate Markov properties of stochastic point processes (1975)
    Springer
    Biological cybernetics 18 (1975), S. 191-208 
    Details
    ISSN: 1432-0770
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Informatik , Physik
    Notizen: Abstract Neuronal spike trains are regarded as stochastic point processes. To estimate the order and value of Markov processes of the interspike interval sequences with small number of samples, we have proposed a new measure of simplified statistical dependencyd m. This measure is derived from statistical dependencyd m (T=τ) in the case of Gaussian process, and is obtained by the standard deviation and the matrices of the serial correlation coefficients. Sinced m is a parametric measure, it is calculated from the interval sequence transformed into the aormal distribution. We designate this as normalized simplified statistical dependencyNd m. The order and value of the maintained spike sequences recorded from the mesencephalic reticular formation, red nucleus, optic tract, and lateral geniculate nucleus neurons in cats have been estimated. It is indicated that there is a considerable correspondence between the value ofNd m and that ofd m (T=τ). This suggests thatNd m is useful in practice to estimate the order and value of Markov process with small number of samples.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00326689
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  • 19
    Digitale Medien
    Digitale Medien
    Dependency as a measure to estimate the order and the values of Markov processes (1977)
    Springer
    Biological cybernetics 25 (1977), S. 209-226 
    Details
    ISSN: 1432-0770
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Informatik , Physik
    Notizen: Abstract To evaluate the order and the values of Markov properties of the time series of events, we have proposed a statistical measure “dependency”:D m = (H 0 −H m )/H 0 , whereH 0 andH m are Shannon's entropy and them-th order conditional entropy, respectively. It is indicated that $$\tilde D_m = \sum\limits_{v = 1}^m {(\hat D_v - \bar D_v^{sh} } )$$ is a better point estimator ofD m, giving a total value of them-th order Markov process. Here $$\hat D_m $$ and $$\bar D_m^{sh} $$ are the estimate ofD m and the arithmetic mean of $$\hat D_m^{sh} $$ when them-th order shuffling is made many times for a given observed series, respectively. The value $$\hat D_m - \bar D_m^{sh} = d_m $$ represents Markov value of the orderm. Under the assumption that the series has continuous variables and the normal distribution, simplified dependency is defined by , where |S m | is the determinant of serial correlation coefficients. It is shown that is practically useful for the estimation of the order and the values of Markov processes with small sample size. It is also indicated that analysis is basically equivalent to the least mean-square analysis of autoregressive models.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01885639
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  • 20
    Digitale Medien
    Digitale Medien
    Dependency representing Markov properties of nonstationary spike trains recorded from the cat's optic tract fibers (1979)
    Springer
    Biological cybernetics 35 (1979), S. 43-54 
    Details
    ISSN: 1432-0770
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Informatik , Physik
    Notizen: Abstract The order and the values of Markov properties of nonstationary stochastic processes are inferred by the use of them-th order Markov value and simplified dependency , respectively: and HereK=0.5log2 e, and $$\left| {\hat R_m } \right|$$ is the correlation coefficient determinant obtained from the ensemble averages of sample records. When an observed value is greater than or equal to the critical value, , the null hypothesis of the (m-1)th order, , is rejected at the level of significance α. Hereχ 1 2 (α) is the chi-square value with one degree of freedom at α andN is sample size. With these statistics it was shown that the order and the values of Markov properties of spike trains of optic tractX- andY-fibers became higher and larger, respectively, after the light spot presentation; and that the values due to negative correlation came to increase and returned to the maintained level earlier inY-fibers than inX-fibers, while the maximum values forX-fibers continued to the light off. It is discussed that Markov properties of spike trains of optic tract fibers in the visual pathway seem to constitute a significant component of the neural information code.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01845843
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