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  • 1
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We measured the conversion efficiency of laser pulse energy into keV x rays from a variety of solid planar targets and a Xe gas puff target irradiated using a high average power Nd:glass slab laser capable of delivering 13 ns full width at half-maximum pulses at up to 20 J at 1.053 μm and 12 J at 0.53 μm. Targets were chosen to optimize emission in the 10–15 A(ring) wavelength band, including L-shell emission from materials with atomic numbers in the range Z=24–30 and M-shell emission from Xe (Z=54). With 1.053 μm a maximum conversion of 11% into 2π sr was measured from solid Xe targets. At 0.527 μm efficiencies of 12%–18%/(2π sr) were measured for all of the solid targets in the same wavelength band. The x-ray conversion efficiency from the Xe gas puff target was considerably lower, at about 3%/(2π sr) when irradiated with 1.053 μm. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
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  • 2
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Collisionally pumped soft x-ray lasers now operate over a wavelength range extending from 35 to 300 A(ring). These well-characterized sources have high peak brightness (GeV blackbody temperature) and narrow bandwidth making them ideal for x-ray imaging and interferometry. We will describe experiments which have used the yttrium neon-like x-ray laser operating at 155 A(ring) to probe plasmas at electron densities exceeding 4×1021 cm−3. The short pulse duration of this x-ray laser (∼150 ps) has made it possible to image directly driven thin foils with 1–2 μm spatial resolution. Advances in multilayer mirrors and beam splitters have now also made it possible to develop x-ray laser interferometers. We will describe initial experiments to probe plasmas relevant to ICF using x-ray laser interferometry. The progress in the development of short pulse x-ray lasers (∼30 ps) which are ultimately necessary to extend x-ray laser diagnostic techniques to higher densities will also be presented. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
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  • 3
    Digitale Medien
    Digitale Medien
    Cambridge : Cambridge University Press
    Bulletin of the School of Oriental and African Studies 61 (1998), S. 175-176 
    ISSN: 0041-977X
    Quelle: Cambridge Journals Digital Archives
    Thema: Ethnologie , Geschichte
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Cambridge : Cambridge University Press
    Bulletin of the School of Oriental and African Studies 59 (1996), S. 129-130 
    ISSN: 0041-977X
    Quelle: Cambridge Journals Digital Archives
    Thema: Ethnologie , Geschichte
    Materialart: Digitale Medien
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    Plant cell reports 19 (1999), S. 210-212 
    ISSN: 1432-203X
    Schlagwort(e): Key words Microsatellites ; PCR ; Protoplast fusion ; Somatic hybrids ; Solanum tuberosum
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Somatic hybrids between Solanum tuberosum cv 'Brodick' and S. sanctae-rosae were selected for having elevated chromosome numbers, intermediate morphology and potato cyst nematode resistance (derived from S. sanctae-rosae). DNA was extracted from this material and subjected to inter-SSR PCR directed by oligonucleotide primers comprising 5′-anchored di- and tri-nucleotide repeat motifs. PCR products were separated by polyacrylamide gel electrophoresis and visualised by silver staining. An average of 30.31 bands per primer were generated in each parent and, on average, 8.19 of these bands were polymorphic. S. sanctae-rosae-specific bands were observed in the hybrid material as was evidence of deletions, substitutions and rearrangements. The relative merits of this technique for the analysis of somatic hybrid material are discussed.
    Materialart: Digitale Medien
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  • 6
    ISSN: 1432-0428
    Schlagwort(e): Key words Non-insulin-dependent diabetes mellitus ; myocardial infarction ; angiotensin-converting enzyme ; genetics ; risk factors.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The deletion allele of the insertion/deletion polymorphism of the angiotensin-converting enzyme gene has been suggested to be an independent risk factor for myocardial infarction, particularly in subjects judged to be “low-risk” by the criteria of lipid status and body mass index. In a prospective, matched case-control study, we have investigated the role of this polymorphism as a risk factor for myocardial infarction in 173 newly-diagnosed British Caucasian non-insulin-dependent diabetic subjects taken from the United Kingdom Prospective Diabetes Study who subsequently developed myocardial infarction and 297 control subjects from the same study population matched for known cardiovascular risk factors including age at diagnosis of diabetes, gender, blood pressure, low-density lipoprotein cholesterol, high-density lipoprotein cholesterol, triglyceride and smoking habit. A trend towards increased risk conferred by homozygosity for the deletion allele was observed in cases (odds ratio 1.63, p = 0.09). When the population was stratified according to the matched risk factors, the deletion allele was associated with myocardial infarction in those with low plasma low-density lipoprotein cholesterol (odds ratio 3.67, p = 0.002), or low triglyceride (odds ratio 3.14, p = 0.005). The strongest association of the deletion allele with myocardial infarction was observed in subjects with both low low-density lipoprotein cholesterol and low triglyceride levels (odds ratio 9.0, p 〈 0.001). These results show that the deletion allele is a risk factor for myocardial infarction in non-insulin-dependent diabetic patients who have a favourable lipid profile. [Diabetologia (1995) 38: 948–952]
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Diabetologia 42 (1999), S. 1107-1112 
    ISSN: 1432-0428
    Schlagwort(e): Keywords Diabetic retinopathy ; microaneurysms ; UKPDS ; Type II diabetes ; diabetes ; complications.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Aims/hypothesis. To determine whether microaneurysms, in the absence of other lesions, have a predictive role in the progression of diabetic retinopathy in Type II (non-insulin-dependent) diabetes mellitus. Methods. Retinal photographs taken at diagnosis in patients participating in the United Kingdom Prospective Diabetes Study, and thereafter at 3 yearly intervals, were assessed using a modified Early Treatment of Diabetic Retinopathy grading system for lesions of diabetic retinopathy and end points of vitreous haemorrhage and photocoagulation. The number of microaneurysms in each eye was recorded. Results. The changes between diagnosis and later photographs were analysed in 2424 patients at 6 years, 1236 at 9 years and 414 at 12 years. Of the 2424 patients studied in the 6 year cohort 1809 had either no retinopathy or microaneurysms only at entry. In these patients the presence of microaneurysms alone and also the number of microaneurysms had a high predictive value for worsening retinopathy at 3, 6, 9, and 12 years after entry into the study (e. g. at 6 years χ 2 for trend = 75 on 1 df, p 〈 0.001). The predictive value of the presence or absence of microaneurysms and their number at 3 years from diagnosis and subsequent worsening retinopathy was similar to that at entry. Conclusion/interpretation. Microaneurysms are important lesions of diabetic retinopathy and even one or two microaneurysms in an eye should not be regarded as unimportant. [Diabetologia (1999) 42: 1107–1112]
    Materialart: Digitale Medien
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  • 8
    ISSN: 1432-0428
    Schlagwort(e): Non-insulin-dependent diabetes mellitus ; myocardial infarction ; angiotensin-converting enzyme ; genetics ; risk factors
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The deletion allele of the insertion/deletion polymorphism of the angiotensin-converting enzyme gene has been suggested to be an independent risk factor for myocardial infarction, particularly in subjects judged to be “low-risk” by the criteria of lipid status and body mass index. In a prospective, matched case-control study, we have investigated the role of this polymorphism as a risk factor for myocardial infarction in 173 newly-diagnosed British Caucasian non-insulin-dependent diabetic subjects taken from the United Kingdom Prospective Diabetes Study who subsequently developed myocardial infarction and 297 control subjects from the same study population matched for known cardiovascular risk factors including age at diagnosis of diabetes, gender, blood pressure, low-density lipoprotein cholesterol, high-density lipoprotein cholesterol, triglyceride and smoking habit. A trend towards increased risk conferred by homozygosity for the deletion allele was observed in cases (odds ratio 1.63, p=0.09). When the population was stratified according to the matched risk factors, the deletion allele was associated with myocardial infarction in those with low plasma low-density lipoprotein cholesterol (odds ratio 3.67, p=0.002), or low triglyceride (odds ratio 3.14, p=0.005). The strongest association of the deletion allele with myocardial infarction was observed in subjects with both low low-density lipoprotein cholesterol and low triglyceride levels (odds ratio 9.0, p〈0.001). These results show that the deletion allele is a risk factor for myocardial infarction in non-insulin-dependent diabetic patients who have a favourable lipid profile.
    Materialart: Digitale Medien
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  • 9
    Digitale Medien
    Digitale Medien
    Springer
    Plant cell reports 18 (1999), S. 786-790 
    ISSN: 1432-203X
    Schlagwort(e): Key words Microcell ; Gametosomatic ; Spindle toxins
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The potential of gametic microprotoplasts as a tool for partial genome transfer in potato (Solanum tuberosum L.) was investigated and a number of technical findings are reported. The phosphoric amide herbicide amiprophos-methyl was effective for microcell induction when applied at a concentration of 25 μm to excised anther material; however, neither whole buds nor isolated microspores responded to treatment. One selected clone responded well to spindle toxin treatment, and microcells were observed in 9% of tetrads, for which 4% (wt/vol) cellulase Onozuka R10 and 0.25% (wt/vol) driselase was found to be optimal for the release of protoplasts from the tetrads with conversion rates exceeding 40%. Technical problems identified at a number of crucial stages that may preclude the more widespread application of this technology are discussed.
    Materialart: Digitale Medien
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  • 10
    ISSN: 1435-604X
    Schlagwort(e): Keywords: Collagen; Infrared thermometry; Radiometry; Temperature; Tissue fusion
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin , Physik , Technik allgemein
    Notizen: Abstract. A preliminary single-animal study of in vivo argon laser vascular welding was conducted using a canine model. The effects of temperature feedback control and saline drip cooling on patency and collagen cross-linking were investigated. The surface temperature at the centre of the laser spot was monitored using a two-colour infrared thermometer. The surface temperature was limited by either a saline drip or feedback control of the laser. Acute patency was evaluated and collagen cross-link assays were performed. Though both protocols yielded successful tissue fusion, welds maintained at a surface temperature of 50°C using feedback control had an elevated cross-link count compared to controls, whereas tissues irradiated without feedback control experienced a cross-link decrease. Simulations using the LATIS (LAser-TISsue) computer code suggest that drip-cooled procedures achieve significantly higher temperatures beneath the tissue surface than temperature feedback-controlled procedures. Differences between the volumetric heating associated with drip-cooled and feedback-controlled protocols may account for the different effects on collagen cross-links. Covalent mechanisms may play a role in argon laser vascular fusion.
    Materialart: Digitale Medien
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