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  • 1
    Electronic Resource
    Electronic Resource
    The effect of position and delay on stroke and minute distance in late pregnancy (1987)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 94 (1987), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Stroke and minute distance were measured in 12 women in late pregnancy using Doppler ultrasound. In each patient two sets of measurements were made every 2 min for 20 min in the supine and left lateral positions, the sequence of positions being reversed on the second occasion. Within each of the four 20 min measurement periods there were no significant changes with time in stroke distance, heart rate, or minute distance, or in their coefficients of variation. From this evidence there is no justification for delaying the measurement of cardiac output until a 'steady state’is reached. The measurements were influenced both by the sequence and the position in which they were taken, the effects being additive. Overall, stroke distance was 5·1% greater in the left lateral than in the supine position, heart rate was 3·7% less and minute distance not significantly different. Independent of posture, stroke distance was 6·5% greater in the second period of measurement than in the first, heart rate was 3% less and minute distance 2·8% more. In late pregnancy the relative magnitude of cardiac output in the left lateral and supine positions has to be interpreted in the light of a stepwise increase of aortic blood flow with change of posture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1987.tb03141.x
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  • 2
    Electronic Resource
    Electronic Resource
    NEUROLOGICAL CONSEQUENCES OF MAGNESIUM DEFICIENCY: CORRELATIONS WITH EPILEPSY (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental pharmacology and physiology 14 (1987), S. 0 
    Details
    ISSN: 1440-1681
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: SUMMARY1. The plasma calcium and magnesium concentrations of sheep have been manipulated by feeding liquid diets with various calcium and magnesium concentrations.2. When the magnesium status of the diet was low, both plasma calcium and magnesium concentrations declined, but the decline in calcium was much more rapid and extensive when the content of calcium in the diet was also low. This loss of calcium control in magnesium deficiency was attributed to end-organ resistance to parathyroid hormone.3. Correlation between plasma and CSF calcium and magnesium concentrations indicated that convulsions occurred when CSF magnesium and plasma calcium concentrations declined.4. The neurological mechanisms likely to be responsible for the induction of these convulsions are discussed and the factors precipitating convulsions in magnesium deficiency and epilepsy are compared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1681.1987.tb00985.x
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  • 3
    Electronic Resource
    Electronic Resource
    Topological structure of integral manifolds and period-doubling bifurcation (1987)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 38 (1987), S. 302-314 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Wir untersuchen die topologische Struktur von Integralmannigfaltigkeiten in der Nähe einer geschlossenen Lösungskurve eines autonomen Differentialgleichungssystems. Wir beweisen, daß unter gewissen Umständen diese Mannigfaltigkeiten homöomorph zu einem Möbius-Band sind. Es wird gezeigt, daß das Auftreten einer Periodenverdopplungsbifurkation in parameterabhängigen Systemen eng mit der Existenz einer Zentrumsmannigfaltigkeit verknüpft ist, die homöomorph zu einem Möbius-Band ist. Abschließend demonstrieren wir, daß die Periodenverdopplungsbifurkation als Hopf-Bifurkation auf einem Möbius-Band behandelt werden kann.
    Notes: Abstract We investigate the topological structure of integral manifolds near a closed orbit of an autonomous differential system. We prove that under some circumstances these manifolds are homeomorphic to a Möbius strip. It is shown that the appearance of a period-doubling bifurcation in systems depending on a parameter is intimately connected with the occurence of a center manifold homeomorphic to a Möbius strip. Finally we demonstate that the period-doubling bifurcation can be treated as Hopf bifurcation on a Möbius strip.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00945415
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  • 4
    Electronic Resource
    Electronic Resource
    Computer optimization of the performance of an anaerobic filter used for purification of highly polluted wastewater from a sugar refinery (1989)
    Springer
    Cellular and molecular life sciences 45 (1989), S. 1024-1029 
    Details
    ISSN: 1420-9071
    Keywords: Anaerobic filter ; computer control ; optimization ; sugar refinery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An anaerobic filter system with a volume of 11 l fed with wastewater from the Swiss sugar refinery in Frauenfeld was established on a laboratory scale. It provided a filter performance of over 8 kg COD·m−3·d−1 with an efficiency of at least 70%. A 600–1 pilot plant system in the factory gave a degradation efficiency of 70% when fed with 28 kg COD·m−3·d−1 and yielded 0.34 m3 methane/kg COD, demonstrating that the scaling-up of the anaerobic filter had been successful. The rapidly-varying concentrations of organic materials in the wasterwater required the constant control of the wastewater flow to the system. A control program was developed for a small computer using an empirical model simulating the operator. By varying the influx rate of the wastewater to the anaerobic filter the computer kept the system at an optimal organic load. The results obtained were equivalent to those obtained by permanent control of the system by an operator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01950153
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  • 5
    Electronic Resource
    Electronic Resource
    Failure to reduce cholesterol as explanation for the limited efficacy of antihypertensive treatment in the reduction of CHD (1987)
    Springer
    Journal of molecular medicine 65 (1987), S. 828-832 
    Details
    ISSN: 1432-1440
    Keywords: Cholesterol ; Intervention ; Hypertension ; CHD reduction ; Trials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Over the past 6 years, major hypertension intervention studies in Europe, Australia, and the USA have shown disappointing results in the prevention of coronary heart disease (CHD) in spite of adequate treatment and good compliance. Recently, it has become increasingly clear that hypertensives with or without treatment display higher cholesterol levels than normotensive persons. The present review examines cholesterol levels in six intervention studies, none of which offered dietary or drug therapy for hypercholesterolemic patients. The Oslo study and the British MRC Trial reported very high average cholesterol levels and both showed no protection from CHD through intensive therapy in comparison to control patients. The Australian and the American MRFIT studies produced evidence for reduced coronary mortality among hypertensives with low in contrast to those with high cholesterol levels. The European Working Party showed indirectly that patients with marked reduction in blood pressureand cholesteral had a significantly lower cardiac mortality compared to placebo-treated patients. The IPPPSH study found that increasing cholesterol levels in hypertensives under beta blockeror diuretic therapy increased the risk of myocardial infarction. Failure to reduce cholesterol in hypertensive patients apparently is a major reason for the limited efficacy of antihypertensive treatment in the reduction of CHD.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01727479
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  • 6
    Electronic Resource
    Electronic Resource
    Vanadium-Akkumulation beim Stickstoff-fixierenden Wasserstoffbacterium Xanthobacter autotrophicus (1988)
    Springer
    Naturwissenschaften 75 (1988), S. 625-627 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366479
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  • 7
    Electronic Resource
    Electronic Resource
    Pyonephrosis in childhood — Is ultrasound sufficient for diagnosis? (1989)
    Springer
    Pediatric radiology 19 (1989), S. 302-307 
    Details
    ISSN: 1432-1998
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The validity of ultrasound in the diagnosis of pyonephrosis in infants and children was retrospectively investigated in 14 patients. The disease was unilateral in 13 patients and bilateral in one. The diagnosis was proven by percutaneous nephrostomy in 7 and by operation in 7 patients. Ultrasound was true positive in 9 patients (10 kidneys) and false negative in 5. Large staghorn calculi were present in 2 of the 5 false negative cases. A group of 20 patients with simple hydronephrosis, investigated by percutaneous punctures, served as a control group. There were two false positive cases in this group. The sensitivity of sonography for the diagnosis of pyonephrosis was only 66.7%, which is considerably lower than in previous reports. We therefore recommend early sonographically guided percutaneous puncture of the renal pelvis whenever pyonephrosis is suspected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02467298
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  • 8
    Electronic Resource
    Electronic Resource
    Umbilical and portal vein calcification following umbilical vein catheterization (1989)
    Springer
    Pediatric radiology 19 (1989), S. 468-470 
    Details
    ISSN: 1432-1998
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Calcifications of the umbilical vein and intrahepatic branches of the portal vein developed in a newborn who had an umbilical vein catheter inserted for 11 days postnatally. The calcified intrahepatic portal veins can still be demonstrated sonographically at the age of three years, but these calcifications were no longer detectable radiologically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02387661
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  • 9
    Electronic Resource
    Electronic Resource
    Malignant gastric sarcoma — diagnosis by ultrasound and endoscopy (1986)
    Springer
    Pediatric radiology 16 (1986), S. 69-70 
    Details
    ISSN: 1432-1998
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A 14-year-old boy was presented with a mass in the epigastrium. The tumor developed 13 years after removal of a neuroblastoma of the left adrenal gland. Therapy of the primary tumor had included irradiation and chemotherapy. Diagnosis of the gastric tumor was made by ultrasound and endoscopy. A total gastrectomy was performed showing a malignant undifferentiated sarcoma. Primary malignant tumors of the stomach such as gastric teratoma of the newborn [4], leiomyosarcoma [6], malignant lymphoma and carcinoma [1] are very rare in childhood. As cancer is treated more aggressively with radiation and cytostatics, more therapy-induced-tumors, including gastric sarcoma, must be expected in children.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02387513
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  • 10
    Electronic Resource
    Electronic Resource
    Erste Erfahrungen mit der Korrelation biochemischer Parameter und fetalem und utero-plazentarem Blutfluß (1989)
    Springer
    Archives of gynecology and obstetrics 245 (1989), S. 63-66 
    Details
    ISSN: 1432-0711
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02417173
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