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  • 11
    Electronic Resource
    Electronic Resource
    Diffusion through a membrane: Approach to equilibrium (1976)
    Springer
    Bulletin of mathematical biology 38 (1976), S. 527-534 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract The transfer of solute through a membrane separating two aqueous solutions is studied with the time-dependent diffusion equation for composite media. By introducing new independent and dependent variables it is shown that the differential equations and boundary conditions can be transformed into a dimensionless form which does not explicitly depend on the diffusivities of the media. Laplace transforms are used to derive explicit solutions for the solute concentration as a function of position and time. It is shown that at large time the concentration approaches the equilibrium distribution exponentially. Explicit results are given for the decay time as a function of the parameters of the system. In addition, an accurate and simplified expression is derived for the decay time for the case of small membrane permeability. The accuracy of the analytic solutions for the concentration profiles is tested by comparing them with numerical results obtained by solving the diffusion equations by the method of finite differences. Excellent agreement is found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02459551
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  • 12
    Electronic Resource
    Electronic Resource
    Superconductivity in simple cubic Te—Au alloys produced by ion irradiation (1979)
    Springer
    The European physical journal 36 (1979), S. 47-56 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Superconducting simple cubic Te100−x Au x films (10〈x〈90) were produced by He+-irradiation at low temperatures as well as at room temperature. After low temperature irradiation the as-irradiated disordered samples forx〈60 at % Au are in a semiconducting state which becomes unstable at about 230 K, and then transform into the s.c. superconducting phase. The resistivity of the s.c. phase displays a negative temperature coefficient for residual resistivity values larger than 100 μΩ cm. In comparison to “splat cooled” foils, the s.c. Te—Au phase in the He+-irradiated films is more homogeneous. The observed variation of the transition temperature to the superconducting state with Au content is explained as an interaction of the Fermi-surface with several Bragg-planes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01333953
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  • 13
    Electronic Resource
    Electronic Resource
    193. Bypass-Chirurgie der Coronararterien bei 95 Patienten über dem 70. Lebensjahr (1975)
    Springer
    Langenbeck's archives of surgery 339 (1975), S. 720-720 
    Details
    ISSN: 1435-2451
    Keywords: Aortocoronary bypass surgery ; Aorto-coronare Bypass-Chirurgie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Von den bis Juli 1974 am Texas Heart Institute durchgeführten 3780 aorto-coronaren Bypass-Operationen waren 95 Patienten 70 Jahre oder älter. Die anfänglich hohe Operationsmortalität in dieser Altersgruppe mit 27% stand in klarem Gegensatz zur Gesamtmortalität von 7,1% und konnte im letzten Jahr - hauptsächlich auf Grund von Verbesserungen in der Operationstechnik - von 27 % auf 4,8 % reduziert werden. Damit kann auch beim alten Patienten, im Einzelfall, eine coronare Bypass-Operation als Behandlungsmöglichkeit ins Auge gefaßt werden.
    Notes: Summary From October 1969 through June 1974, 95 patients over 70 years of age underwent aortocoronary bypass at the Texas Heart Institute. The primary indication for surgery was severe angina, which was present in 88 patients. The mean coronary artery score was 9.51. Improvements in surgical technique are responsible for a reduction in the hospital mortality from 22.1 percent in all 95 patients to only 4.8 percent in the 21 patients operated upon during the first 6 months of 1974.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01257673
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  • 14
    Electronic Resource
    Electronic Resource
    196. Aktive bakterielle Endokarditis und ihre Klappenkomplikationen -Chirurgische Ergebnisse bei 225 Patienten (1975)
    Springer
    Langenbeck's archives of surgery 339 (1975), S. 722-722 
    Details
    ISSN: 1435-2451
    Keywords: Endocarditis ; Valvular complications ; Endokarditis ; Herzklappenprothesen ; Komplikationen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung 225 Patienten wurden wegen aktiver bakterieller Endokarditis oder der Klappenkomplikationen operiert. Die Frühmortalität betrug 12%. Bei 16 Patienten kam es zur Prothesendehiszenz - davon überlebten 6 Patienten die notfall mäßige Reoperation und 7 Patienten verstarben -, eine Indikation zu ausgedehnter Resektion des erkrankten Gewebes. Das mittlere Operationsalter betrug 43 Jahre. Auf Grund der vorliegenden Daten darf angenommen werden, daß die Mortalität durch eine kombinierte klappenchirurgische- und Coronararterien-Operation - falls indiziert-weiter gesenkt werden kann.
    Notes: Summary Between 1959 and 1973, 225 patients were operated on because of active bacterial endocarditis or its valvular complications. The hospital mortality was 12 percent and 60 patients died an average of 2 years after the operation. Seven early deaths occurred among 16 cases of acute dehiscence of the prosthetic valve-an indication for extensive resection of all diseased tissues. The average age was 43 years and there were 21 deaths due to myocardial infarction. The authors believe that the operative mortality can be further reduced through combined valvular and coronary artery surgery where this is indicated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01257676
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  • 15
    Electronic Resource
    Electronic Resource
    123. Frühresultate nach 110 aorto-coronaren Venenbypassoperationen (1978)
    Springer
    Langenbeck's archives of surgery 347 (1978), S. 629-630 
    Details
    ISSN: 1435-2451
    Keywords: Surgery, aortocoronary by-pass ; Early results ; Aortocoronarer Venenbypass ; Frühresultate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In einer 12-monatigen Periode wurden 110 Patienten (102 Männer, 8 Frauen) mit einer Frühmortalität von 4,5 % operiert. Zusatzeingriffe: 3 mal Klappenersatz, 7 mal Aneurysmektomie. Einfach-Bypass erhielten 22 Kranke,ohne Mortalität. 43 Patienten hatten Doppelbypass, hier starben 3, und unter 45 Patienten mit 3–5fachem Bypass starben 2. 88 % der Gruppe weist in einer Frühbeobachtungsperiode von 4 Monaten Besserung im Vergleich mit dem präoperativen Zustand auf. Für das Persistieren der Beschwerden werden Bypassverschlüsse, Myokardinsuffizienz und:diffuse Coronarveränderungen verantwortlich gemacht.
    Notes: Summary During a twelve-month period, 110 consecutive patients (102 men, 8 woman) with chronic stable angina were operated upon. Early mortality was 4.5 % in this specific series. Concomitant valve replacement and left-ventricular aneurysmectomy were performed in three (2 AVR, 1 MVR) and seven patients respectively. Of all survivors, 88 % were free of angina within a 4-month follow-up period. Bypass occlusion, congestive heart failure, and diffuse sclerosis were primarily responsible for unsuccessful operative results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01579415
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  • 16
    Electronic Resource
    Electronic Resource
    Current-induced resistive state of superconducting tin whiskers with indium impurities (1979)
    Springer
    The European physical journal 32 (1979), S. 363-374 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have investigated the current-induced step-like structure in theV−T andV−I characteristics of tin whiskers with a mean free pathl for the electrons which is reduced by indium impurities (up to 3.6 at %). The extrapolation of theV−I characteristics beyond the first voltage step shows a zero-voltage interceptI 0≈0.5I c (I c=critical current). From the differential resistance beyond the first voltage step a lengthL An1 can be obtained which is proportional tol 1/2. These results can be understood by assuming phase-slip centers in the whisker which carry a time-averaged supercurrent of approximately 0.5I c above the critical current, and at which a voltage is developed by the “healing” of nonequilibrium quasiparticles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02109465
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  • 17
    Electronic Resource
    Electronic Resource
    A rapid and simple method for the isolation of pure eosinophilic leukocytes from horse blood (1978)
    Springer
    Cellular and molecular life sciences 34 (1978), S. 1654-1656 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An improved and short method is described for the isolation of intact eosinophilic leukocytes from horse blood with high yield (1–1.5 g/20 1). Viability and purity of the preparations were verified by light and electron microscopy and by the trypan blue exclusion test. Isolated eosinophils were 98–100% pure, intact and viable, and they could be shown to phagocytise immune-complexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02034734
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  • 18
    Electronic Resource
    Electronic Resource
    Residues of triforine and its metabolites in barley grain and straw (1977)
    Springer
    Bulletin of environmental contamination and toxicology 18 (1977), S. 742-748 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01691987
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  • 19
    Electronic Resource
    Electronic Resource
    Modifications induced by benomyl and related compounds into chloroplasts spectral patterns, photosynthetic rates and chlorophyll contents ofSpinacia oleracea andCucumis melo (1977)
    Springer
    Bulletin of environmental contamination and toxicology 17 (1977), S. 431-437 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01685935
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  • 20
    Electronic Resource
    Electronic Resource
    A thermodynamic analysis of the secondary transition in the spontaneous precipitation of calcium phosphate (1978)
    Springer
    Calcified tissue international 25 (1978), S. 209-216 
    Details
    ISSN: 1432-0827
    Keywords: Thermodynamics ; Kinetics ; Apatite ; Octacalcium phosphate ; Tricalcium phosphate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary A thermodynamic analysis has been made of the secondary transition stage in the spontaneous precipitation of calcium phosphate following the amorphous-crystalline transformation. The first formed crystalline material has a solubility similar to that of octacalcium phosphate (OCP) and the computed thermodynamic solubility product remains invariant in the pH range 7.00–8.60. The duration of the secondary stage is sensitive to pH and the transition appears to occur by hydrolysis of the first formed OCP-like phase to a more basic apatitic phase with a tricalcium phosphate (TCP) stoichiometry. The crystalline material at the end of this transition has an invariant solubility product, in the pH range 7.00 to 8.60, when the TCP-like molecular formula is assumed. Changes in the solution chemistry which accompany the solid-tosolid transitions are consistent with the above conclusions. The results of this study are also consistent with those of a previous study which suggest that the stability of the amorphous calcium phosphate phase is dependent upon the instability of the solution phase with respect to OCP formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02010771
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