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  • 1
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 809-811 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The local Ge composition in undulating Si0.8Ge0.2 layers on Si has been studied in a scanning transmission electron microscope using electron energy-loss spectroscopy. We observe Ge enrichment of the SiGe layer near the free surface (vertical Ge segregation in the growth direction) as well as Ge depletion of the ripple troughs compared to the peaks (lateral segregation). These lateral compositional fluctuations are likely to retard the generation of misfit dislocations and might be relevant to the Stranski–Krastanov growth of strained epitaxial alloy layers as well as to the self-organized growth of quantum dot structures. © 1997 American Institute of Physics.
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiac surgery 17 (2001), S. 0 
    ISSN: 1540-8191
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract  Objectives Redo mitral valve surgery via sternotomy is associated with a substantial morbidity and mortality. This study evaluated a minimally invasive technique for mitral valve redo procedures. Material and Methods: Out of a series of 394 patients undergoing mitral valve repair or replacement via a right minithoracotomy, 39 patients underwent redo mitral valve surgery (59 ± 13 years, 23 female). Previous cardiac surgeries included 17 patients with mitral valve repair, 6 patients with mitral valve replacement, 3 patients with aortic valve replacement, 2 patients with atrial septal defect closure, and 11 patients with coronary artery bypass grafting (CABG). In all cases, femoro-femoral cannulation was performed. The port access technique was applied in patients undergoing redo valve surgery. In patients with prior CABG, the operation was performed using deep hypothermia and ventricular fibrillation. Results: In all cases, sternotomy was avoided. The mitral valve was replaced in 20 patients and repaired in 19. Time of surgery and cross-clamp time were comparable with the overall series (168 ± 73 [redo] vs 168 ± 58 min and 52 ± 21 [redo] vs 58 ± 25 min). Mortality was 5.1%. One patient had transient hemiplegia due to the migration of the endoclamp. All other patients had uneventful outcomes and normal mitral valve function at 3-month's follow-up. Conclusion: Redo mitral valve surgery can be performed safely using a minimally invasive approach in patients with a previous sternotomy. The right lateral minithoracotomy offers excellent exposure. It minimizes the need for cardiac dissection, and thus, the risk for injury. Avoiding a resternotomy increases patient comfort of redo mitral valve surgery.
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiac surgery 15 (2000), S. 0 
    ISSN: 1540-8191
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract Objectives: The study describes the single-center experience using robot-assisted videoscopic mitral valve surgery and the early results with a remote telemanipulator-assisted approach for mitral valve repair. Material and Methods: Out of a series of 230 patients who underwent minimally invasive mitral valve surgery, in 167 patients surgery was performed with the use of robotic assistance. A voice-controlled robotic arm was used for videoscopic guidance in 152 cases. Most recently, a computer-enhanced telemanipulator was used in 15 patients to perform the operation remotely. Results: The mitral valve was repaired in 117 and replaced in all other patients. The voice-controlled robotic arm (AESOP 3000) facilitated videoscopic-assisted mitral valve surgery. The procedure was completed without the need for an additional assistant as “solo surgery.” Additional procedures like radiofrequency ablation and tricuspid valve repair were performed in 21 and 4 patients, respectively. Duration of bypass and clamp time was comparable to conventional procedures (107 Å 34 and 50 Å 16 min, respectively). Hospital mortality was 1.2%. Using the da Vinci telemanipulation system, remote mitral valve repair was successfully performed in 13 of 15 patients. Conclusion: Robotic-assisted less invasive mitral valve surgery has evolved to a reliable technique with reproducible results for primary operations and for reoperations. Robotic assistance has enabled a solo surgery approach. The combination with radiofrequency ablation (Mini Maze) in patients with chronic atrial fibrillation has proven to be beneficial. The use of telemanipulation systems for remote mitral valve surgery is promising, but a number of problems have to be solved before the introduction of a closed chest mitral valve procedure.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Chemical Physics Letters 209 (1993), S. 455-458 
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Chemical Physics Letters 231 (1994), S. 64-69 
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Der Anaesthesist 43 (1994), S. 786-790 
    ISSN: 1432-055X
    Keywords: Schlüsselwörter: Trauma – Kardiopulmonale Reanimation – Notarztsysteme ; Key words: Trauma – Cardiopulmonary resuscitation – Emergency medical systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract. Posttraumatic cardiopulmonary resuscitation (CPR) is associated with a poor outcome. When evaluating the literature according to the Utstein method, there were only 2 survivors (0.18%) out of 1,135 CPR attempts after trauma (Table 1). Differences in the study populations and levels of prehospital trauma care led us to analyse the results of a physician-staffed prehospital trauma care system in Cologne. Methods. From January 1987 to December 1990, a total of 49,054 emergency calls were registered using a standardised protocol. Among 9,595 trauma-related calls, 636 patients were found to be pulseless on arrival of the emergency team, 412 of these were pronounced dead. CPR was initiated in the remaining 224 patients, who comprise the study population (defined as 100%). All patients who were admitted to a hospital were followed using a second protocol. Results. CPR in the field was successful in 68 (30.4%) patients, who were then admitted to a hospital; 42 of these died within the first 24 h. Four patients (1.8%) could be discharged from hospital alive and were still living 1 year later, 1 with a lasting neurological deficit (Fig. 1). In 156 (69.6%) cases resuscitative attempts were unsuccessful in the field. Conclusions. Even in a physician-staffed prehospital trauma care system, the chance of surviving a post-traumatic cardiac arrest is minimal. Survival has to be regarded as an individual fate; the overall results are discouraging. Even though this study analyses the largest population of posttraumatic CPR ever published, prognostic factors could not be identified due to the few survivors. Nevertheless, the result does not justify general omission of CPR after trauma as: (1) prognostic factors for survival have not been identified thus far; and (2) no significant additional costs arise from posttraumatic CPR.
    Notes: Zusammenfassung. Für die präklinische kardiopulmonale Reanimation nach Trauma werden in der Literatur Überlebensraten zwischen 0% und 1,7% beschrieben. Die vorliegende Arbeit analysiert die Ergebnisse der Reanimation Schwerverletzter am Beispiel einer Millionenstadt mit einem organisierten Notarztdienst. Vom 01. 01. 1987 bis zum 31. 12. 1990 wurden vom Kölner Rettungsdienst 9595 Verletzte präklinisch behandelt. Von diesen waren 636 bei Ankunft des Notarztes pulslos, in 224 Fällen (definiert als 100%) wurde eine kardiopulmonale Reanimation begonnen. 68 (30,4%) Patienten konnten in ein Krankenhaus eingeliefert werden, vier (1,8%) wurden lebend entlassen. Ein Schwerverletzter mit Herz-Kreislaufstillstand hat eine nur minimale Überlebenschance. Auch bei maximaler präklinischer Therapie unter Einsatz eines Notarztes ist die Überlebensquote enttäuschend. Trotzdem darf nicht grundsätzlich auf eine Reanimation Schwerverletzter verzichtet werden, weil keine Prognosefaktoren zur Identifizierung potentiell Überlebender existieren und weil keine zusätzlichen signifikanten Kosten entstehen.
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  • 7
    ISSN: 1432-0630
    Keywords: 68.55 ; 68.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The interface microstructure of AlAs/GaAs quantum wells grown by molecular beam epitaxy (MBE) was investigated by transmission electron microscopy (TEM). High-resolution transmission electron microscopy (HRTEM) yields information about the width of the chemical transition between the binary components and about the lateral step distances along the interface. The chemical composition is quantitatively determined by the application of a pattern recognition procedure based on the Fourier transformation of image unit cells. Along the 〈100〉 zone axis the composition across the interfaces is obtained with a precision of ±10 atomic percent and with a spatial resolution of 0.28 nm. Despite a lower chemical sensitivity a quantitative chemical analysis was also carried out for images along the 〈110〉 projection.
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  • 8
    ISSN: 1432-0711
    Keywords: Key words:Mycoplasma hominis ; Phospholipase A2 ; Preterm labour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. A possible cause of preterm labour is an increased synthesis of prostaglandins by a phospholipase A2 (PLA2) activity. PLA2 activity has been detected in Mycoplasma hominis. The aim of this study was to test whether chromosomal DNA of M. hominis contains sequences coding for PLA2. M. hominis was cultured in specimens from 5 women with normal pregnancy and 4 in preterm labour. Using sequence alignment, primer pairs for the active part of PLA2 of different species were designed for PCR analysis. No sequences coding for PLA2 could be amplified. Whatever its role in preterm labour, M. hominis is not involved in causing an increase of prostaglandin synthesis.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-1173
    Keywords: Schlüsselwörter Besenreiser ; Sklerotherapie ; Blitzlampengepumpter gepulster Farbstofflaser ; Selektive Photothermolyse ; Key words Ectatic leg veins ; Sclerotherapy ; Flashlamp-pumped pulsed dye laser ; Selective photothermolysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary A new flashlamp-pumped pulsed dye laser with 1,5 ms pulse length and tunable wavelengths between 585 and 600 nm (Candela ScleroPLUS) is now available for the treatment of ectatic leg veins. We evaluated 232 single test treatments using 595 and 600 nm wavelength in 75 test persons. For smaller vessels up to a diameter of 0,5 mm, treatments at 16 and 18 J/cm2 showed good results in 60 and 82% respectively; for vessels up to 1 mm in 27 and 33%. Treatment at 595 nm was a little more effective than at 600 nm. Larger vessels could not be treated effectively. The main side effects consisted in hyper- (34%) or hypopigmentation (30%). Thus, in addition to the usual sclerotherapy, this laser is a useful device for the treatment of leg vein ectasia.
    Notes: Zusammenfassung Zur Behandlung kosmetisch störender Besenreiser steht ein neuer blitzlampengepumpter gepulster Farstofflaser mit 1,5 ms Impulsdauer und verschiedenen Wellenlängen zwischen 585 und 600 nm zur Verfügung (Candela ScleroPLUS). Wir evaluierten 232 einmalige Probebehandlungen mit 595 und 600 nm Wellenlänge bei 75 Probanden. Bei kleineren Gefäßen bis 0,5 mm Durchmesser konnte bei Behandlung mit 16 bzw. 18 J/cm2 unter Zusammenfassung beider Wellenlängen in 60 bzw. 82% der Fälle ein zufriedenstellendes Ergebnis erzielt werden, bei Gefäßen bis 1 mm noch in knapp 27 bzw. 33%, wobei bei 595 nm tendenziell bessere Ergebnisse als bei 600 nm beobachtet werden konnten. Bei größeren Gefäßen zeigte sich kein deutlicher Erfolg. Die Nebenwirkungen beschränkten sich im wesentlichen auf Hyper- (34%) und Hypopigmentierungen (30%). Dieser Laser stellt somit eine sinnvolle Ergänzung zur herkömmlichen Sklerosierungstherapie dar.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 31 (1953), S. 1095-1096 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung Es wurde ein einfaches Differenzverfahren zur flammenphotometrischen Serum-Calciumbestimmung beschrieben. Bei dieser Methode wird in jedes Serum eine bestimmte Menge Calcium eingewogen und aus der wiedergefundenen Calciummenge der Fehler, der durch das Serum verursacht wird, berechnet. — Diese Methode der Calciumanalyse ist genauer als die bisher geübten flammenphotometrischen-und einfacher und schneller als die bekannten chemischen Verfahren.
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