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  • 1
    ISSN: 1433-0423
    Keywords: Schlüsselwörter Thrombendarteriektomie ; TEA ; Okulärer Blutfluss ; A. carotis ; Pulsamplitude ; Key words Thrombendarterectomy ; CEA ; Ocular blood flow ; Carotid artery ; Pulse amplitude
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Successful operations of clinically significant carotid artery stenosis by carotid endarterectomy (CEA) are leading to a better perfusion in the region of this artery. It still creates problems to make a statement about cerebral and ocular perfusion during the operation. Methods. In 10 patients who underwent a CEA the pulse amplitude (PA) of the intraocular pressure (IOP) was measured intraoperatively by a pneumotonograph (OBF-Systems, U.K.) and the so called pulsatile ocular blood flow (pOBF) was determined. The middle arterial blood pressure (MAP) was taken invasively during the operation. Results. During the clamping phases no PA could be recorded. PA (p=0.04) and pOBF (p=0.028) increased on the side which had been operated on. No correalations of PA and pOBF to MAP were found. Conclusion. This method can prove an increased pulsatile ocular blood flow after successful CEA.
    Notes: Zusammenfassung Erfolgreiche Thrombendarteriektomien (TEA) der A. carotis interna führen zu einer verbesserten Perfusion im Stromgebiet dieser Arterie. Es ist jedoch schwierig, während der Operation Aussagen über die zerebrale und okuläre Durchblutung zu treffen. Methode. Bei 10 Patienten mit klinisch signifikanter A.-carotis-Stenose, die sich einer A.-carotis-TEA unterzogen erfolgte eine nichtinvasive intraoperative Messung der Pulsamplitude (PA) des intraokularen Drucks mit einem Pneumotonographen (OBF-Systems, U.K.). Aus der PA wurde der sog. Pulsatile okuläre Blutfluss (pOBF) errechnet. Der mittlere arterielle Blutdruck wurde während der gesamten Operation invasiv gemessen. Ergebnisse. Während der Abklemmphasen konnte keine PA gemessen werden. Postoperativ kam es zu einem Anstieg der PA (p=0,04) und des pOBF (p=0,028) auf der operierten Seite im Vergleich zu den präoperativen Werten. Es wurde kein Zusammenhang zwischen dem pOBF bzw. der PA und dem mittleren arteriellen Blutdruck festgestellt. Schlussfolgerung. Diese Methode kann eine veränderte pulsatile okuläre Perfusion nach einer erfolgreichen TEA nachweisen.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of cosmetic science 10 (1988), S. 0 
    ISSN: 1468-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A rapid method has been developed in order to compare the photostability of several sunscreen agents incorporated in the same type of emulsion. Thin films of the different preparations were spread on quartz plates and irradiated with a solar simulator. Differences in energy distribution according to wavelengths observed with solar simulator and sun radiation were taken into account. A kinetic study of absorption properties was carried out under solar simulator irradiation. A simple calculation gave the results which would be obtained under sunlight.This technique differentiated the reversible transformations of photoisomerizable compounds from an irreversible disappearance which resulted in a significant loss of protective power.Applied to benzylidene camphor derivatives, this technique showed the excellent photostability of these sunscreen agents.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of cosmetic science 15 (1993), S. 0 
    ISSN: 1468-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Removability by shampoo and water is one of the criteria to be met by polymers used in hair sprays or setting lotions. To obtain quantitative measures for removabilities, ample laboratory testing is required. Gravimetry is one method which serves this purpose, with the disadvantage of being very time-consuming and depending on the individual handling of the materials. The new method to be presented in this paper is based on conductivity measurements of polymer-coated electrodes in electrolyte solutions. The effect of polymer blending and the degree of neutralization on removability can be assessed readily. Several polymers commonly used in hair sprays or setting lotions and polymer mixtures were tested. Comparison of the results shows good correlation between the two methods. The new method is especially useful in screening experiments. Changes in polymer properties as a function of composition can be detected rapidly.〈section xml:id="abs1-2"〉〈title type="main"〉RésuméElimination au lavage est l'un des critères que doivent posséder les polymères utilisés dans les laques capillaires et les lotions coiffantes. Pour obtenir des mesures quantitatives quant à ce critère, des tests approfondis sont nécessaires. La gravimétrie est une méthode qui permet d'atteindre cet objectif avec l'inconvénient d'être longue, fastidieuse et dépendant de la manière dont les individus manipulent les matériaux. La nouvelle méthode présentée dans cet article est basée sur les mesures de conductivité d'électrodes enduites de polymères dans des solutions d'électrolyte. Il est alors aisé d'analyser le degré de neutralisation et d'élimination des polymères. On a ainsi testé plusieurs polymères purs ou en mélange fréquemment utilisés dans les laques capillaires ou lotions coiffantes. La comparaison des résultats montre une bonne corrélation entre les deux méthodes. La nouvelle méthode est particulièrement utile dans les expériences de criblage. Les changements de propriétés des polymères peuvent être rapidement détectés.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Blood viscosity (Contraves L S 30) and its determinants were measured in 23 patients with mild/moderate pre-eclampsia, 10 patients with intrauterine growth retardation and 22 control subjects, matched for age and gestation. Both abnormal groups had a significantly increased blood viscosity at high shear rate (94 s-1) associated with increased haematocrit. Fibrinogen levels were also increased, but there were no significant differences between groups in plasma viscosity, low shear viscosity (0.94s-1) or red cell deformability, measured by a low-shear washed cell system of filtration through 5-μm pore diameter Nuclepore filters. In the pre-eclamptic group, measurements were repeated after 1–2 weeks in nine patients treated with labetalol (a combined alpha and beta adrenergic blocker) and in 10 patients treated with bed rest. Labetalol reduced blood pressure but no change in rheology was seen in either group. Control of blood pressure by labetalol does not adversely affect rheology, in contrast to diuretics which are known to cause haemoconcentration and increased blood viscosity.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 96 (1989), S. 0 
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary. Doppler signals were recorded from the umbilical arteries in 103 women during labour. The pulsatility index (PI) did not alter with progress in labour. During uterine contractions the PI showed a change only if there was a deceleration in the fetal heart rate. Low birthweight (〈10th centile) and delivery by caesarean section for fetal distress were significantly more frequent in patients with abnormal PI values (defined as 〉2 SD above the mean in normal labours). Fetal scalp blood pH was measured in 24 patients. The PI was abnormal in only one case, but none of the 24 had a pH 〈7·20.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 95 (1988), S. 0 
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 92 (1985), S. 0 
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Industrial & engineering chemistry 50 (1958), S. 1781-1784 
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Inorganic chemistry 26 (1987), S. 1039-1045 
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 1548-1550 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optical switching of a new middle trace observed in an optically controlled parallel resonant tunneling (OPT) device is demonstrated. A circuit model for the OPT is developed. The circuit model satisfactorily explains the existence of the middle trace and its optical switching.
    Type of Medium: Electronic Resource
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