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  • 1
    Electronic Resource
    Electronic Resource
    Far-field and near-field material processing with. femtosecond laser pulses (1999)
    Springer
    Applied physics 69 (1999), S. S7 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 42.62.-b; 42.65.Re; 81.65.Cf
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Recently, it has been proven that femtosecond lasers are ideal tools for the microstructuring of solid targets. Since thermal and mechanical influences are minimized, diffraction-limited structures can be generated in the far field. The diffraction limit can be overcome when one works in the near field. In this paper, concrete applications and new developments in both regimes are highlighted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003399900391
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Polarization effects in ultrashort-pulse laser drilling (1999)
    Springer
    Applied physics 68 (1999), S. 563-567 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 79.20.D; 42.62.C
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. A strong influence of the polarization of the laser radiation on the geometry of laser-machined microdrillings has been observed for ultrashort pulses. For drillings with a certain aspect ratio, reflections at the hole walls take place, leading to a non-uniform intensity distribution deep inside the formed hole. Experimental and theoretical results on this subject are discussed. It is shown that a rotation of the polarization during the drilling process (“polarization trepanning”) significantly improves the quality of the produced holes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050941
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The glutamate dehydrogenase gene gdhA increased the resistance of tobacco to glufosinate (2004)
    Oxford, UK : Blackwell Science Ltd
    Weed research 44 (2004), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The gene gdhA from Escherichia coli, that encodes a NADPH-dependent glutamate dehydrogenase (GDH), directs a novel pathway in transgenic plants that allows an increase in ammonium assimilation. Glufosinate leads to plant death by the irreversible inhibition of glutamate synthetase (GS) leading to a disruption of subsequent GS-related processes resulting in elevated ammonium and disruption of photorespiration. Therefore, it was speculated that the gdhA-transformed plants may exhibit a novel mechanism of resistance to glufosinate by altered activity of the GDH-directed pathway(s) and subsequently related processes. Studies were conducted in the greenhouse to evaluate the resistance of tobacco plants containing the gdhA gene to glufosinate. Five tobacco genotype lines were investigated including a non-transformed control line, a positive control line and three transformed lines with levels of increasing GDH activity directed by the gdhA gene. Plants transformed with the gdhA gene expressed up to six times increased level of resistance (GR50) to glufosinate compared with the non-transformed control, which is 100 times less resistant than plants transformed with the bar gene. The GDH activity among lines was highly correlated (r2 = 0.9903) with the level of herbicide resistance. Thus, the use of the E. coli gdhA gene in plant transformations can provide an additional mechanism for resistance to glufosinate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3180.2004.00411.x
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  • 4
    Electronic Resource
    Electronic Resource
    Serum α1-microglobulin and β2-microglobulin for the estimation of fetal glomerular renal function (1991)
    Springer
    Pediatric nephrology 5 (1991), S. 573-577 
    Details
    ISSN: 1432-198X
    Keywords: α1-Microglobulin ; β2-Microglobulin ; Creatinine ; Neonate ; Fetal kidney function
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract As proteins cannot cross the placenta levels of the microproteins α1-microglobulin (α1MG) and β2-microglobulin (β2MG) can be used to assess fetal glomerular renal function. α1MG, β2MG and creatinine were routinely determined in cord and maternal blood of 133 newborns [gestational age (GA) 25–42 weeks]. Twenty-nine patients with suspected impaired maternal or fetal renal function were studied separately and two fetuses were studied in utero. The mean fetal β2MG concentration fell from 3.87±0.56 mg/l in the 25–31 weeks GA group to 2.60±0.50 mg/l in the mature newborn group. α1MG concentration fell from 3.10±0.51 to 2.25±0.49 mg/dl. In contrast, the mean maternal β1MG concentration rose from 1.73±0.69 mg/l in the 25–31 weeks GA group to a mean of 1.83±0.48 mg/l in the mature newborn group; α1MG rose from 3.96±0.58 to 4.33±1.6 mg/dl. Maternal and fetal creatinine levels were identical. Fetal microprotein levels fall during intra-uterine development as glomerular filtration rate (GFR) rises. There is no correlation between cord blood and maternal α1MG or β2MG concentrations. In 13 children with urological anomalies only 1 had elevated microprotein levels and he later developed renal insufficiency. Determination of microprotein levels in fetal serum can be used to detect severe renal function disturbances and to estimate GFR independently of maternal renal function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00856641
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Clinical quiz (1992)
    Springer
    Pediatric nephrology 6 (1992), S. 119-120 
    Details
    ISSN: 1432-198X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00856856
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Femtosecond, picosecond and nanosecond laser ablation of solids (1996)
    Springer
    Applied physics 63 (1996), S. 109-115 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.15
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  Laser ablation of solid targets by 0.2–5000 ps Ti : Sapphire laser pulses is studied. Theoretical models and qualitative explanations of experimental results are presented. Advantages of femtosecond lasers for precise material processing are discussed and demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01567637
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Beam delivery of femtosecond laser radiation by diffractive optical elements (1998)
    Springer
    Applied physics 67 (1998), S. 517-520 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.40; 81.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050814
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Femtosecond, picosecond and nanosecond laser ablation of solids (1996)
    Springer
    Applied physics 63 (1996), S. 109-115 
    Details
    ISSN: 1432-0630
    Keywords: 81.15
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Laser ablation of solid targets by 0.2–5000 ps Ti: Sapphire laser pulses is studied. Theoretical models and qualitative explanations of experimental results are presented. Advantages of femtosecond lasers for precise material processing are discussed and demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01567637
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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