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  • 11
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Restoration ecology 4 (1996), S. 0 
    ISSN: 1526-100X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A rehabilitation procedure designed to reestablish resource control processes in a degraded Acacia aneura woodland was successful in improving soil nitrogen and carbon content, exchange properties, and water infiltration rates. Soil respiration rates and soil fauna populations increased, and soil temperatures were moderated. The procedure comprised laying piles of branches in patches on the contour of bare, gently sloping landscapes, with the expectation that soil, water, and litter would accumulate in these branch piles, thus improving the soil habitat and its productive potential. The procedure was derived from landscape function analysis, indicating that surface water flow was the principal means of resource transfer in these landscapes. Under degradation such overland flow results in a loss of resources. This rehabilitation procedure reversed loss processes, resulting in gains in the productive potential of soils within patches. This procedure was successful despite grazing pressure being maintained throughout the experiment.
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Restoration ecology 4 (1996), S. 0 
    ISSN: 1526-100X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: This paper describes a practical technique, tested experimentally, for rehabilitating degraded semiarid landscapes in Australia. This rehabilitation technique is based on the ecological principle that semiarid landscapes are spatially organized as patchy, source-sink systems; this patchy organization functions to conserve limited water and nutrients within the system. The aim was to rebuild vegetation patchiness, lost through decades of utilization of these landscapes as rangelands. Patches were reconstructed from large tree branches and shrubs obtained locally and placed in elongated piles along contours. These piles of branches were very effective in recreating productive soil patches within the landscape, as described in part I of this study. These new patchy habitats promoted the establishment and growth of perennial grasses. Although the foliage cover of these grasses declined into a drought, which started before the end of the experiment, plant survivorship remained high. This suggests that patches also function as refugia for organisms during droughts. The patches of branches remained robust and functional, even under grazing impacts, although plant growth and survival were significantly higher within an ungrazed paddock than in a grazed paddock.
    Type of Medium: Electronic Resource
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  • 13
    ISSN: 1432-1920
    Keywords: Unruptured familial intracranial aneurysms ; Elective screening ; Intravenous digital subtraction angiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The authors discuss the detection of intracranial aneurysms (IA) by means of intravenous digital angiography (ivDSA) in (a)symptomatic first degree relatives of families in which two or more individuals have IA. ivDSA is an almost noninvasive and low-risk diagnostic procedure. Screening, by means of ivDSA, of two affected families is described. In family I which includes 7 members with proven IA, ivDSA has been carried out in 36 asymptomatic individuals: in one, a 6x15 mm aneurysm was found at the left posterior communicating artery (PCoA). In family II, including one member with a proven IA and another with a subarachnoid hemorrhage, ivDSA has been carried out in 4 members: one aneurysm with a diameter of 6 mm was found at the left PCoA. Conventional cerebral angiography (CCA) confirmed both IA's. Neurosurgical treatment followed. The advantages and disadvantages of ivDSA vs. CCA as elective screening procedure in such cases are discussed. Screening of asymptomatic first degree relatives of cases with familial IA by means of ivDSA is strongly advocated.
    Type of Medium: Electronic Resource
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  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 334 (1986), S. 393-396 
    ISSN: 1432-1912
    Keywords: Isoprenaline ; Uptake2 ; Extracellular potassium ; Rat heart
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The kinetics of the inhibitory effect of extracellular K+ on uptake2 of3H-(±)-isoprenaline were determined in isolated hearts obtained from reserpine-pretreated rats; catechol-O-methyl transferase was inhibited. 1. Initial rates of uptake2 of a very low concentration of3H-(±)-isoprenaline (10 nmol/l) were determined in the presence of various extracellular concentrations of K+ (2.7 to 60 mmol/l). The inhibitory effect of K+ was concentration-dependent with an IC50 of about 20 mmol/l. — In these experiments KCl was added to the perfusion solution, and some hypertonicity resulted. In some experiments NaCl was added to a solution containing 5 mmol/l K+ to result in the same degree of hypertonicity as that obtained for 60 mmol/l K+; hypertonicity increased the initial rate of uptake2 of3H-(±)-isoprenaline. Thus, the inhibitory effect of K+ had been slightly underestimated. 2. In subsequent experiments the increase of the concentration of K+ in the perfusion fluid to 30 mmol/l was compensated for by a corresponding reduction of Na+. Initial rates of uptake2 of 10 nmol/l3H-(±)-isoprenaline were determined in the absence and presence of various concentrations of unlabelled (±)-isoprenaline. At 30 mmol/l K+ the IC50 (=K m for uptake2) did not significantly differ from that determined in an earlier study of 2.7 mmol/l K+ (Grohmann and Trendelenburg 1984). Finally, theV max for uptake2 of3H-(±)-isoprenaline was determined at either 2.7 or 30 mmol/l K+. At 30 mmol/l K+ theV max was only about 1/4 of that observed at 2.7 mmol/l K+. 3. Extracellular K+ inhibits uptake2 of3H-(±)-isoprenaline primarily by a reduction ofV max.
    Type of Medium: Electronic Resource
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  • 15
    ISSN: 1433-0431
    Keywords: Key words AC joint dislocation • AC joint stabilization • AC joint arthroplasty • Rockwood classification • PDS augmentation ; Schüsselwörter AC-Gelenkluxation • AC-Gelenkstabilisierung • AC-Gelenkresektionsarthroplastik • Rockwood-Klassifikation • PDS-Augmentation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung 42 Patienten mit posttraumatischer Residualinstabilität und/oder sekundärer Akromioklavikular (AC)Arthrose nach AC-Gelenksubluxationen wurden operativ behandelt. In 26 Fällen lag eine deutliche horizontale Instabilität mit Klavikulaversatz um mindestens halbe Schaftbreite sowie Läsionen der Deltotrapezoidfaszie vor. Der ursprüngliche Verletzungstyp umfaßte: Rockwood II: 7 Fälle; III: 9; IV: 17; V: 9. In 23 Fällen wurde eine ausschließliche Weaver-Dunn-Operation vorgenommen. Von den 26 Patienten mit horizontaler Instabilität wurden 7 ebenfalls mit einer Standard-Weaver-Dunn-Operation behandelt und die restlichen 19 zusätzlich mit einer korakoklavikulären (3 × 1 mm) und AC- (1 × 1- oder 1,5-mm) PDS-Kordelaugmentation in Verbindung mit einer Deltotrapezoidfaszienplastik. Ergebnisse: Im Patte-Score wurden nach einer Mindestnachuntersuchungszeit von 2 Jahren (Mittelwert: 32 Monate) mit der Weaver-Dunn-Operation 88,4 % erfolgreiche Resultate erzielt. Dabei traten signifikante Unterschiede auf zwischen Patienten mit horizontaler Restinstabilität (57,2 % gute und sehr gute Ergebnisse) und solchen ohne (93,8 % gute und sehr gute Resultate). Die Gruppe mit horizontaler Instabilität, die zusätzlich zur Weaver-Dunn-Operation noch eine komplexe Augmentation und Faszienstabilisierung erhielt, erreichte 89,5 % sehr gute und gute Resultate. Schlußfolgerung: Unter den Patienten mit schlechten Ergebnissen nach konservativer Behandlung von ACG-Sprengungen scheinen Fälle mit horizontaler Instabilität und Verletzungen der Deltotrapzeoidfaszie überrepräsentiert zu sein. In diesen Fällen können durch Ergänzung der klassischen Weaver-Dunn-Operation um eine korakoklavikuläre und akromioklavikuläre PDS-Augmentation mit Deltotrapzeoidfaszienplastik gleich gute Ergebnisse erzielt werden wie bei Patienten mit im wesentlichen vertikaler Residualinstabilität und Arthrose.
    Notes: Summary Resection arthroplasty of the AC joint was performed in 42 cases of osteoarthrosis and residual instability of traumatic origin including 26 shoulders with horizontal instability of more than half of the width of the clacicula and lesions of the deltotrapezoid fascial complex (Rockwood type II: 7; type III: 9; type IV: 17; type V: 9). 23 cases were treated with a sole Weaver-Dunn procedure. 26 cases with horizontal instability and lesions of the deltotrapezoid fascia (Rockwood IV and V type) were treated in 7 cases with the standard Weaver-Dunn procedure and in 19 cases with a modified Weaver-Dunn procedure in combination with a coracoclavicular (3 × 1) and acromio-clavicular (1 × 1) 1 mm PDS string augmentation and double breasting fascioplasty of the deltotrapezoid complex. Results: Successful results (in Patte-Score) after a minimum follow-up of 2 years (mean: 32 months) were reached in 88,4 % of cases with only Weaver/Dunn procedure with a significant difference of good and excellent results in the horizontally stable group (93.8 %) versus the horizontally unstable group (57.2 %). In the group with horizontal instability and Weaver-Dunn procedure and complex additional stabilization with fascioplasty and PDS augmentation, 89,5 % excellent and good results were found. Conclusion: Cases with horizontal instability (type Rockwood IV and V) seem to be overrepresented among patients with failed conservative treatment. Resection arthroplasty with ligament transposition after Weaver/Dunn gives excellent results in posttraumatic osteoarthrosis with mainly vertical and moderate horizontal instability. In cases with advanced horizontal instability after Rockwood IV and V injuries, almost equal results can be reached by an additional coracoclavicular and acriomioclavicular PDS augmentation with deltotapezoid fascioplasty.
    Type of Medium: Electronic Resource
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  • 16
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 32 (1999), S. 833-836 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A complex high-temperature furnace has been produced from presintered α-Al2O3 precompacts. The furnace is designed for the Mar345 imaging-plate detector system. Up to now, the design complexity of ceramic parts has been limited by the difficulty of machining hard ceramic materials or by the moulds used in hot-pressing and casting. However, the machining of soft presintered ceramic materials enables the realisation of much more demanding designs, provided that the final sintering shrinkage of the ceramic is homogeneous and predictable. The design of the furnace and its realisation and application in an X-ray diffraction study with synchrotron radiation are presented.
    Type of Medium: Electronic Resource
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  • 17
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 169-170 (June 1999), p. 197-200 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 18
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 19
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 20
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 159-160 (May 1998), p. 135-150 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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