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  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 299-300 (Dec. 1998), p. 165-170 
    ISSN: 1662-9752
    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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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 307-311 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A simple design for a mechanically driven three-dimensional cryogenic micropositioner is presented. The design is based on a parallelogram structure constructed from leaf springs and wires. Actuation is achieved by the elastic deformation of the parallelogram by screws. Positions within a volume of roughly (2 mm)3 are attainable. The precision and reproducibility of positioning are in the μm-range. The deviations from linearity are smaller than 10% for the whole working range and the deviation from orthogonality is smaller than 3°. Calibration measurements performed on a Cu-mesh with a lattice constant of 60 μm are presented. In an experiment investigating the ballistic transport of carriers in the semimetal Bi, two such devices are used. The first one is used as a scanning unit for an optical fiber and the second one is used as micropositioner for a Cu point contact. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Graefe's archive for clinical and experimental ophthalmology 237 (1999), S. 484-488 
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  · Background: Advanced glaucoma typically results in damage of the temporal neuroretinal rim. As vascular factors are of pathogenic importance in the development of glaucomatous damage, the present study investigated whether regional differences in perfusion might be the reason for the preferential damage of the temporal neuroretinal rim. · Material and methods: Blood flow of the neuroretinal rim was measured with the laser Doppler flowmeter (LDF) Oculix 4000 (continuous measurement of an area of 160 µm diameter) and the Heidelberg retina flowmeter (HRF). Both instruments measure the capillary blood flow (flow), the relative velocity of erythrocytes (velocity) and the relative volume of moving erythrocytes (volume). We examined one randomly chosen eye of 55 healthy subjects without history of glaucoma aged 22–57 years (mean 30 years). Each subject was measured with the LDF and HRF, each time nasally and temporally, away from visible vessels. The intraocular pressure (IOP) was measured with the Goldmann tonometer. Heart rate and systolic and diastolic blood pressure were measured. · Results: The LDF measurements of the optic nerve head showed nasal flow of 12.4±5.6 AU and temporal flow of 9.8±3.6 AU. The HRF showed a nasal flow of 477±161 AU and a temporal flow of 368±166 AU. The volume measurements done by LDF showed nasally a value of 0.68±0.40 AU and temporally a value of 0.46±0.21 AU. The HRF volume measurements showed nasal values of 16.1±4.3 AU and temporal values of 13.0±4.0 AU. The LDF velocity values were nasally 0.22±0.05 kHz and temporally 0.26±0.05 kHz. HRF measurements showed velocity values of 1.7±0.5 kHz nasally and 1.3±0.6 kHz temporally. The differences were highly statistically significant for flow (LDF P=0.00007, HRF P=0.0005), volume (LDF P=0.00002, HRF P=0.00004) and velocity (LDF P=0.0002, HRF P=0.00004). The IOP was 12.6 mmHg. Blood pressure was 118/75 mmHg and the heart rate was 73 beats per minute. There was no correlation between age, IOP, BP and HR and the HRF/LDF measurements. · Conclusion: The measurements with two different methodologies showed a decreased blood flow of the temporal neuroretinal rim compared to the nasal side. These local differences might be one reason for the preferential damage of the temporal neuroretinal rim in advanced glaucoma.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    The visual computer 14 (1998), S. 488-496 
    ISSN: 1432-2315
    Keywords: Key words: Texture mapping ; Procedural texture ; Texture control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Der Nervenarzt 69 (1998), S. 335-337 
    ISSN: 1433-0407
    Keywords: Schlüsselwörter Nervenkompressionssyndrom ; Kiloh-Nevin-Syndrom ; N.-interosseus-anterior-Syndrom ; Sehnenruptur ; Key words Nerve compression syndrome ; Kiloh-Nevin syndrome ; Interosseus anterior nerve syndrome ; Tendon rupture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The differential diagnosis of the rupture of flexor pollicis longus tendon and profundus tendon to index finger to the interosseus anterior nerve syndrome can be difficult and can lead to misinterpretation of the clinical impression. Two cases are reported to demonstrate this problem. In the first case a spontaneous rupture of flexor pollicis longus was found, when first an interosseus anterior nerve syndrome was suspected. In a second case surgical exploration of flexor pollicis longus tendon and profundus tendon to index finger was done on the assumption of a rupture, that revealed intact tendons. In a second operation neurolysis of the interosseus anterior nerve was carried out with full recovery of flexion of the thumb and index finger.
    Notes: Zusammenfassung Die Differentialdiagnose einer Ruptur des M. flexor pollicis longus und M. flexor digitorum profundus II zum N.-interosseus-anterior-Syndrom kann schwierig sein und zu Fehlinterpretationen des klinischen Bild führen. Anhand von 2 Fallberichten soll dies aufgezeigt werden. Im ersten Fall fand sich bei klinischem Verdacht auf ein N.-interosseus-anterior-Syndrom eine Spontanruptur des Flexor pollicis longus rechts. In einem zweiten Fall wurde eine operative Exploration der langen Daumen- und tiefen Zeigefingerbeugesehne unter der Annahme einer Ruptur vorgenommen. Hier fanden sich intakte Sehnen. In einer zweiten Operation wurde die Neurolyse des N. interosseus anterior vorgenommen, die zu einer vollständigen Wiedererlangung der Beugefunktion in den Endgliedern des Daumen und Zeigefingers führte.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Plant cell reports 17 (1998), S. 415-421 
    ISSN: 1432-203X
    Keywords: Key words RAPD-PCR ; DNA-sequencing ; Vitis vinifera L. ; retrotransposon-like sequence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract When assaying for sequence heterogeneity within monomorphic RAPD-PCR products in grapevines (Vitis spp.), we observed partial digestibility of a marker with the restriction enzyme MspI. The degree of digestion varied reproducibly between different cultivars. To study this phenomenon, two of the amplification products were cloned and sequenced. They show 91.7% similarity to each other. The DNA analysed was found to possess high similarity to retrotransposons from higher plants. This element seems repetitive and dispersed throughout the genome. To our knowledge, this is the first report of retrotransposon-like elements in woody plants.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 70 (1998), S. 1202-1202 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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