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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 86 (1964), S. 4506-4507 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 87 (1965), S. 1819-1820 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1084
    Keywords: Venous angioma ; Developmental venous anomaly ; Magneticresonance ; Cavernoma ; Cerebral veins ; Cryptic vascular malformations ; Angiographically occult vascular malformations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This study reviews the neuroradiological findings of 43 patients with a developmental venous anomaly In in order to the clinical significance of this entity. All patients underwent unenhanced and contrast-enhanced computer tomography and magnetic resonance tomography, as well as selective angiography, and were followed for at least 2 years In 40% (17 of 43) of patients a cryptic vascular malformation found In the proximity to the developmentmental venous anomaly. Neurolo gical symptoms were present in 8 of 17 patients (47%) in this group. Patients with an isolated developmental venous anomaly had symptoms in 19% (5 of 26), but none of them had experienced a hemorrhage. Magnetic resonance was the most sensitive method for the diagnose of both types of lesions and alterations of the adjacent parenchyma. These results further support that developmental venous anomalies represent a clinically benign entity. However, patient, with an sociation of a developmental venous anomaly and a cryptic vascular malformation are at risk for hemorage from their angiographically occult vascular malformation. Magnetic resonance proved to be the imaging modality of choice for both entities and is appropriate for diagnosis and follow-up.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 31 (1966), S. 2568-2571 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 37 (1972), S. 2969-2979 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1524-475X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The hypercatabolism after massive pediatric burns has been effectively treated with recombinant human growth hormone, an anabolic agent that stimulates protein synthesis and abrogates growth arrest. While experimental studies have shown increased potential for fibrosis induced by growth hormone therapy, adverse effects on human scars have not been investigated. Our aim was to evaluate hypertrophic scar formation in 62 patients randomized to receive injections of 0.05 mg/kg/day of recombinant human growth hormone or placebo, from discharge until 1 year after burn. Scar scales were used to evaluate scar-severity at discharge, 6, 9, 12, and 18–24 months after burn, by three observers blinded to treatment. Computer-assisted planimetry allowed quantification of percentage of hypertrophic scar formation. Types I and III collagens were localized and quantified in scars and normal skin of patients from both groups, using immunohistochemistry with confocal laser microscopy analysis. Insulin-like growth factor-1 blood levels helped assess compliance. Statistical analysis showed that scar hypertrophy significantly increased from 6 to 12 months after injury in both groups, while decreasing at 18–24 months postburn. Types I and III collagens were statistically increased in the reticular layer of scars from both groups when compared to paired normal skin. Insulin-like growth factor-1 was significantly increased in the recombinant human growth factor-treated group. No differences were seen when recombinant human growth factor and control groups were compared using the scar scales, planimetry, or immunohistochemistry. We concluded that recombinant human growth hormone therapy did not adversely affect scar formation and should not contraindicate the administration of recombinant human growth hormone as a therapeutic approach to severely burned children.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of solid state electrochemistry 1 (1997), S. 215-220 
    ISSN: 1433-0768
    Keywords: Key words Prussian blue ; Ammonium ; Voltammetry ; Flow-through ; Kjeldahl
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new method is described for the determination of ammonium in aqueous solutions with electrodes modified by Prussian blue (PB). The specific voltammetric response of PB-modified electrodes to ammonium ions is used for their analytical determination. In the presence of ammonium ions, a concentration-dependent inhibition of the low-spin iron(II/III) system of PB occurs. Only thallium and rubidium ions cause similar inhibition. A useful electrochemical determination method is thus available for detecting ammonium ions in the presence of frequently interfering potassium and sodium ions. Paraffin-impregnated graphite electrodes modified with a mechanically transferred PB layer and bulk-modified PB-composite electrodes are studied. The method is applicable within a concentration range which extends from 4 × 10−5 mol/l to 10−2 mol/l NH4 +. The composite electrode is used in an electrochemical flow-through system in conjunction with the Kjeldahl method.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-2102
    Keywords: Key words Internal carotid artery disease • Cerebral hemodynamic • Cerebral perfusion reserve • Xenon-CT • HMPAO-SPECT ; Schlüsselwörter A.-carotis-interna-Stenose/-Verschluß• Zerebrale Perfusionsreserve • Xenon-CT • HMPAO-SPECT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die zerebrale Hämodynamik bei A.-carotis-interna-(ACI-)Stenosen/-Verschlüssen wird von extra- und intrarkaniellen Kollateralen beeinflußt. Ziel dieser Studie war es, die Befunde der regionalen zerebralen Perfusionsreserve (rCPR) mit angiographisch nachgewiesenen Kollateralisierungs- und Anastomosierungstypen zu vergleichen. Bei 41 Patienten (28 Männer, 13 Frauen, Alter 63 ± 10 Jahre) mit angiographisch untersuchten ACI-Stenosen/-Verschlüssen (30 Stenosen, 11 Verschlüsse) wurden in 24 Fällen eine 99 mTc-HMPAO-SPECT und in 25 eine dynamische Xe-CT jeweils vor und nach Diamox®-Stimulation durchgeführt. Für die rCPR-Quantifizierung wurde in der Xe-CT das Verhältnis der absoluten rCBF-Werte und in der HMPAO-SPECT der Zählratendichten jeweils nach zu vor Diamox berechnet. Eine rCPR 〈 95 % in einem zerebralen Gefäßterritorium wurde als pathologisch gewertet. Bei allen Patienten lag eine aktuelle CT-Untersuchung vor. Angiographisch wurde das Kollektiv in 3 Kollateralisierungstypen eingeteilt: Gruppe A (9 Patienten) mit karotidaler Restperfusion, Gruppe B (8 Patienten) mit Kollateralisierung über den Circulus Willisi und Gruppe C (24 Patienten) mit leptomeningealen und/oder A. ophthalmica Anastomosen. Die rCPR unterschied sich sowohl in der Xe-CT (p = 0,0035) als auch in der HMPAO-SPECT (p = 0,0014) signifikant in den Gruppe B und C: in der Xe-CT war die rCPR in 13/14 Fällen erniedrigt und in der HMPAO-SPECT in 11/14. Alle Gruppe B-Patienten hatten sowohl in der Xe-CT als auch in der HMPAO-SPECT eine normale rCPR. In Gruppe A wiesen 6/7 mit Xe-CT untersuchte Fälle eine eingeschränkte rCPR auf, während in der HMPAO-SPECT die rCPR bei allen 4 Patienten normal war. Die zerebrovaskuläre Hämodynamik hängt von der Kollateralisierung und nicht vom A.-carotis-interna-Stenosegrad allein ab. Eine eingeschränkte zerebrale Perfusionsreserve in einem Gefäßterritorium ipsilateral zu einer ACI-Stenose/-Verschluß korreliert in einem hohen Maß mit dem Vorhandensein von leptomeningealen und/oder A.-ophthalmica-Anastomosen.
    Notes: Summary The cerebral hemodynamics in patients with carotid disease is influenced by a network of extra- and intracranial collaterals. The purpose of this study was to compare the findings of regional cerebral perfusion reserve (rCPR) with angiographically proven collateral circulation. In 41 patients (28 men, 13 women, age 63 ± 10 years) with angiographically proven carotid stenoses or occlusions (30 stenoses, 11 occlusions) 24 99 mTc-HMPAO-SPECT and 25 dynamic Xe-CT investigations were conducted, both before and after acetazolamide stimulation. rCPR was quantified as the ratio (1) of the absolute rCBF values obtained by Xe-CT and (2) of the count density measured by HMPAO-SPECT of the acetazolamide administration. A rCPR of less than 95 % in a vascular territory was classified as compromised rCPR. A recent CT examination was available in all cases. According to the angiographic findings the patients could be classified into (1) group A (n = 9) with residual carotid perfusion, (2) Group B (n = 8) with collateralization via the circle of Willis, and (3) group C (n = 24) with leptomeningeal or ophthalmic artery collateral circulation. The rCPR values were significantly different in groups B and C with both methods, Xe-CT (P = 0.0035) and HMPAO-SPECT (P = 0.0014). rCPR was decreased in 13/14 group C patients investigated with Xe-CT and in 11/14 examined with HMPAO-SPECT. All patients in group B showed normal rCPR according to Xe-CT and HMPAO-SPECT. In group A, six of seven revealed decreased rCPR on Xe-CT, while rCPR values were normal in all four group A-patients examined with HMPAO-SPECT. The cerebral hemodynamics depend on a collateralization network and not only on the degree of internal carotid artery (ICA) stenosis. A decreased CPR in a vascular territory ipsilateral to an ICA stenosis or occlusion correlates strongly with the angiographic finding of leptomeningeal or ophthalmic artery collateral circulation.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 97 (1995), S. 205-211 
    ISSN: 1434-6036
    Keywords: 05.50.+q ; 07.50.Jk ; 64.60.Ak ; 75.40.Mg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We propose a new perturbation approach to finitesize effects within the ϕ4 field theory for a one-component order parameter with periodic boundary conditions. Our approach is applicable both above and belowT c . Renormalization-group calculations of finite-size scaling functions in three dimensions are compared with new Monte Carlo data for theL×L×L Ising model withL=8, 16, 32. The field-theoretic predictions are in good overall agreement with the Monte Carlo data.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Kováts retention indices ; Propellants ; Solvents ; Aerosol packs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A gas chromatographic method is described by which a nearly complete separation of all commonly used propellants and solvents and their identification and determination can be achieved in one step. The separation is by simple adsorption chromatography on columns packed with Porapak-T with a temperature program 100–180°C at 10°C/min. Kováts' retention indices have been calculated for isothermal conditions at 150°C respectively 100°C for the propellants, at 180°C for the solvents. An exact identification of the propellants and solvents by means of the Kováts' indices is practicable even in complex mixtures.
    Notes: Zusammenfassung Es wird eine gas-chromatographische Methode angegeben, welche eine fast vollständige Auftrennung aller handelsüblichen Aerosol-Treibgase und Lösungsmittel und ihre Identifizierung und Bestimmung in einem Schritt gestatet. Die Trennung erfolgt durch reine Adsorptions-Chromatographie and Porapak T-Säulen bei 100–180°C mit einer Temperaturate von 10°C/min. Zur Bestimmung der Retentionsindices nach Kovats wurden die Treibgase isotherm bei 150°C bzw. 100°C, die Lösungsmittel bei 180°C aufgetrennt. Anhand der Kovats-Indices ist eine eindeutige Identifizierung der Treibgase und Lösungsmittel selbst in vielfältigen Gemischen möglich.
    Type of Medium: Electronic Resource
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