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  • 1
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0340-1855
    Keywords: Schlüsselwörter Knorpelmarker ; COMP ; Rheumatoide Arthritis ; Arthrose ; Key words Marker of cartilage ; COMP ; rheumatoid arthritis ; osteoarthritis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Today, we can assess criteria to predict the tissue destruction and progression of Rheumatoid Arthritis (RA) and Osteoarthritis (OA) only in a late stage of the disease. It would be an advantage to have biochemical markers of disease activity and joint destruction to optimize therapy. Patients and Methods: In this cross-sectional study with 37 RA and 20 OA patients (disease duration 119±130 months for RA and 41±73 months for OA), ESR, CRP, disease activity score (DAS), the functional status of RA (American College of Rheumatology), and the radiological scoring systems of Larsen and Kellgren/Lawrence, respectively, were used as parameters for disease activity and joint destruction. Cartilage oligomeric matrix protein (COMP) was measured with an enzyme-linked immunosorbent assay (ELISA) in serum and synovial fluid, COMP fragments with immunoblot in the synovial fluid. Results: The mean COMP value in synovial fluid was 38ug/ml (RA) and 46ug/ml (OA); 6.5ug/ml (RA) and 3.4ug/ml (OA) in serum. RA patients had a higher amount of small COMP fragments in synovial fluid than OA patients. In RA patients, there was a significant positive correlation between disease activity (DAS) and COMP in synovial fluid and serum, a negative correlation between functional status of RA and serum COMP and between radiologic joint destruction of the knee and serum COMP. In OA patients, there was a significant correlation of joint space width and synovial fluid COMP. Discussion: A high clinical disease activity (DAS) correlated with high COMP values in serum and synovial fluid and with increasing proteolytic activity (higher amount of small COMP fragments especially in RA). An increased turnover of cartilage matrix in joint inflammation might explain this correlation. The correlation of decreased COMP with decreased functional status in RA and increased joint destruction is compatible with a loss of cartilage and less turnover. The correlation between joint space width and increased COMP in OA patients with short disease duration might be explained with a higher turnover of the cartilage matrix in the early stage of the disease
    Notes: Zusammenfassung Alle bis heute verwendeten Kriterien zur Messung der Gewebedestruktion bei rheumatoider Arthritis (RA) und Arthrose (OA) zeigen erst ein relativ spätes Stadium des Krankheitsprozesses an. Die Verfügbarkeit von biochemischen Markern, mit denen die Krankheitsaktivität oder die Gelenkzerstörung im Sinne einer Risikoabschätzung vorausgesagt und deren Verlaufswerte zur Erfolgskontrolle bei Therapie eingesetzt werden könnten, wäre ein wichtiger Fortschritt. Patienten und Methoden: In dieser Querschnittsstudie wurden 37 RA- und 20 OA-Patienten mit einer Krankheitsdauer von 119±130 rsp.41±73 Monaten untersucht. Als Parameter der Krankheitsaktivität bzw. der Gewebezerstörung wurden BSR, CRP, Disease Activity Score (DAS), der funktionelle Status der RA gemäß American College of Rheumatology sowie zwei radiologische Scoring Systeme (Larsen Score bei RA- und die Kellgren-Lawrence Kriterien bei OA-Patienten) bestimmt. Mittels enzyme-linked immunosorbent assay (ELISA) wurde cartilage oligomeric matrix protein (COMP) im Serum und in der Synovialflüssigkeit dieser Patienten gemessen. Zusätzlich wurden mittels Gel-Elektrophorese und Immunoblot die COMP-Fragmente in der Synovialflüssigkeit ermittelt. Resultate und Diskussion: Der mittlere COMP-Wert in der Synovialflüssigkeit betrug bei RA-Patienten 38ug/ml, bei OA-Patienten 46ug/ml, im Serum 6,5ug/ml rsp. 3,4ug/ml. Bei RA-Patienten korrelierte eine zunehmende Krankheitsaktivität (DAS) mit einem erhöhten COMP-Wert, sowohl in der Synovialflüssigkeit als auch im Serum. Eine erhöhte Freisetzung von kleinen COMP-Fragmenten in der Synovialflüssigkeit, wies auf eine vermehrte proteolytische Aktivität hin. Diese Ergebnisse beruhen wahrscheinlich auf einem erhöhten Umsatz von Knorpelmatrix im entzündeten Gelenk bei RA. Die RA-Patienten in dieser Querschnittsstudie wiesen außerdem eine Korrelation von abnehmendem COMP-Spiegel mit Abnahme der körperlichen Funktion bzw. zunehmender Gelenkzerstörung, auf. Dies deutet auf einen Verlust an Gelenkknorpel mit verminderter Gesamtmenge und Umsatz von COMP hin. Bei OA-Patienten mit kurzer Krankheitsdauer wurde eine signifikante Korrelation zwischen zunehmend (aber insgesamt wenig) reduzierter Gelenkspaltweite und einem erhöhtem COMP-Wert in der Synovialflüssigkeit gefunden. Dieser Zusammenhang legt nahe, daß im kurz- bis mittelfristigen Verlauf des Krankheitsprozesses ein erhöhter Umsatz an Knorpelmolekülen beobachtet werden kann.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physics Letters A 88 (1982), S. 450-452 
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 512-518 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Cluster ion distributions of water in a molecular beam are investigated by femtosecond ionization at 780 nm and reflectron time-of-flight mass spectrometry. The electric field strength generated by the ultrashort laser pulses is sufficient to efficiently ionize most of the molecules that are present in the molecular beam. In this work ion signals of large water clusters containing up to 60 monomers are reported. Upon ionization rapid proton transfer is observed, leading to the formation of protonated water cluster ions. Unprotonated clusters (H2O)n+(n〉2) are not observed in the mass spectra. The configurational energy imparted to the protonated clusters induces unimolecular dissociation on the μs time scale. These metastable reactions are characterized by modeling the ion trajectories in the mass spectrometer. The numerical procedure in conjunction with the integrated parent and daughter intensities results in unimolecular dissociation rates as a function of cluster size. Additional information about proton transfer reactions is obtained by the investigation of deuterium substitutions. Even though these substitutions correspond to large relative changes in the mass of the atom as well as in the zero point energy, unprotonated (D2O)n+ clusters of significant abundance are not produced in supersonic expansions of deuterated water. An additional result of this work is the observation of doubly charged ions above a critical cluster size (n=37). © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of interventional cardiology 5 (1992), S. 0 
    ISSN: 1540-8183
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Balloon angioplasty of the coarctation of the aorta can result in intimal or medial or even adventitial dissections as demonstrated by in vitro studies and animal experiments. As a typical sign of stretching of the aortic wall, patients complain of pain during the angioplasty procedure. In the literature, aortic wall rupture and ventricular fibrillation during the procedure are reported. Additional sudden deaths can occur within 40 hours after the procedure. Mortality ranges from 0.1% to 2.5%. By transesophageal echocardiography, monitoring of balloon angioplasty, control of the positioning of the balloon, and control of the results and detection of complications are possible. Intimal as well as medial dissections can be detected with observed healing for intimal but also medial dissections. In order to avoid the patient's discomfort, intraaortic ultrasound will be used in the future, when major methodological improvements are done. Computed tomography demonstrates medial dissections but is not able to visualize intimal dissections. Using computed tomography and magnetic resonance after angioplasty of the coarctation of the aorta, irregularities are described in up to 17% of the patients. For angiography, a low detection rate of medial dissections has to be expected, when not biplane angiographies of the whole thoracic aorta are performend. Medial dissections can be seen, but intimal dissections are missed. In conclusion, a review of the literature demonstrates a high incidence of intimal and medial dissections after angioplasty of the coarctation of the aorta with spontaneous healing in most patients. As is the way with coronary angioplasty, aortic wall ruptures are rare, but stand-by surgery is necessary.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 1018-1020 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Laser ablation at 355 nm of a specially designed polymer was used as a true single step dry-etching process to create a two-beam interference grating. Gratings with groove spacings of 180 and 1090 nm were created with single laser pulses. Moreover, by varying the laser fluence and/or the angle between the two beams, variable modulation frequencies (depth/spacing) could be obtained. Additional pulses deteriorated the grating quality, demonstrating the importance of the single pulse approach. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Optics Communications 35 (1980), S. 242-244 
    ISSN: 0030-4018
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    FEBS Letters 268 (1990), S. 415-421 
    ISSN: 0014-5793
    Keywords: Accessory gene ; Immunodeficiency virus ; Leukemia/lymphoma virus ; Reverse transcriptase ; Transactivation
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    FEBS Letters 197 (1986), S. 84-88 
    ISSN: 0014-5793
    Keywords: AIDS Reverse transcriptase Heterogeneity ; HTLV-III
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0014-5793
    Keywords: AIDS ; Human lymphotropic virus ; Monoclonal antibody ; Reverse transcriptase
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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