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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 22 (1989), S. 3969-3973 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 171 (1999), S. 131-134 
    ISSN: 1432-072X
    Keywords: Key words Nitrogen-fixing bacteria ; Stringent response ; ppGpp ; RelA ; ATP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Following amino acid or ammonium starvation, ppGpp is accumulated by Rhizobium meliloti strain 1021 but not by R. meliloti strain 41 or Rhizobium tropici. Azorhizobium caulinodans ORS571 produced ppGpp following amino acid deprivation; however, the free-living nitrogen-fixing bacteria Azotobacter vinelandii and Azomonas agilis did not produce ppGpp. Western blot analysis using anti-RelA antibody demonstrated that R. meliloti strain 1021, Azotobacter vinelandii and Azorhizobium caulinodans cross-reacted under conditions that detected RelA in Escherichia coli CF1648. Cross-reaction was not observed in R. meliloti strain 41, R. tropici, or Azomonas agilis. All strains that accumulated ppGpp also produced high intracellular levels of ATP.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    European radiology 8 (1998), S. 9-15 
    ISSN: 1432-1084
    Keywords: Key words: Pancreatic cancer ; Interventional radiology ; ERCP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Pancreatic carcinoma is increasing in its incidence, and despite advances in surgical treatment and chemotherapy, its prognosis remains extremely poor. Realistic therapy is targeted primarily at the relief of obstruction of the biliary tract and the duodenum, as well as the relief of pain. This paper discusses the indications and techniques for palliation and illustrates the critical team approach between radiologist, endoscopist and surgeon.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    European radiology 8 (1998), S. 1602-1607 
    ISSN: 1432-1084
    Keywords: Key words: Bile leaks ; Biloma ; Bile duct injury
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. This paper evaluates the management of 31 patients with bile leaks identified over a 7-year period. Leaks complicated cholecystectomy in 19 patients (11 laparoscopic, 8 open), interventional procedures in 10 (including surgery in 1), trauma in one and was spontaneous in one case. Confirmation of the diagnosis typically lagged behind the onset of symptoms (mean for the group 4.2 days), indicating that a high index of suspicion is required in at-risk patients with typical symptoms. These include abdominal pain or distension, fever, bile leaking along a drain, jaundice, abnormal liver function tests and elevated white cell count. Two post-surgical bile leaks required surgical drainage of abdominal cellections. The remainder were successfully managed by non-operative methods including percutaneous drainage, endoscopic retrograde cholangiography with or without sphincterotomy or stent placement and percutaneous stenting. The spontaneous leak and all bile leaks complicating interventional procedures were managed non-operatively, although six patients in this group died due to the underlying malignant pathology. Only the patient with self-inflicted transection of the bile duct died directly from the complications of the bile leak. Although this is a varied, small series, we conclude that the majority of bile leaks can be managed by non-operative techniques. Whilst endoscopy is the primary modality for treatment, percutaneous techniques are crucially important for the management of complex cases and endoscopic failure.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-1084
    Keywords: Key words: Dysphagia ; Metallic stents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. The role of self-expanding metallic stents is well established in the palliation of oesophageal stenosis and dysphagia due to primary oesophageal malignancy. However, their role in palliation of dysphagia due to external compressive mediastinal malignancies is not well established. The purpose of this study was to assess the efficacy of self-expanding metallic stents in the palliation of dysphagia due to extrinsic oesophageal compression by mediastinal malignancy. Between January 1995 and January 1998, 21 patients with oesophageal compression due to malignant mediastinal tumours underwent oesophageal stent placement for palliation of dysphagia. Complete data were available in 17 patients (10 men and 7 women). The mean age was 63.5 years (range 46–89 years). A total of 19 stents were placed successfully. The dysphagia grade prior to and after oesophageal stent placement was assessed and the complications documented. Of the 17 patients, 16 reported an improvement in dysphagia. The mean dysphagia score improved from 3.1 prior to treatment to 1.3 after treatment. In 1 patient the stent slipped during placement and another stent was placed satisfactorily. Early complications (within 48 h) in the form of mild to moderate retrosternal chest pain occurred in 5 patients. This was treated symptomatically. Late complications (after 48 h) in the form of bolus impaction occurred in 2 patients. This was successfully treated with oesophagoscopy and removal of bolus. In 2 patients the stent was overgrown by tumour and in one of these an additional stent was placed. In 1 patient incomplete closure of a tracheo-oesophageal fistula was observed. There was no procedure- or stent-related mortality. The mean survival time of this group was 2.1 months. Self-expanding metallic stents can be safely and effectively used in the palliation of dysphagia due to external mediastinal malignancies.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 17 (1964), S. 313-313 
    ISSN: 0001-5520
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Habitat International 6 (1982), S. 441-457 
    ISSN: 0197-3975
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geography , Sociology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Research in Personality 18 (1984), S. 352-358 
    ISSN: 0092-6566
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Psychology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Biotechnology progress 6 (1990), S. 93-97 
    ISSN: 1520-6033
    Source: ACS Legacy Archives
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: We have developed statistical models of upper and middle crustal seismic velocity heterogeneity based on geologic maps and petrophysical data from the Lewisian gneiss complex, Scotland. the level of heterogeneity we have measured is relevant to seismic exploration of the crystalline crust using conventional reflection and refraction techniques. We digitized two 1:10560 geologic maps of Laxfordian (Archean) age Lewisian rocks on a 26.8m grid. Both maps are believed to be representative of the upper and middle crust in north-western Scotland, and both are believed to provide cross-sectional views of parts of the crust. the digital maps were characterized by the statistics of their lithologic populations and by their 2-D spatial autocorrelation functions. Different lithologies were assigned seismic velocities appropriate for the mid-crust using petrophysical data. Three lithologies are dominant: silicic gneisses (Vp∼6.2 km s−1), mafic amphibolites (Vp— 6.75 kms−1), and intermediate composition schists (Vp—6.5kms−1). Both maps have self-affine spatial fabrics.The first map covers the core of a syncline. Its autocorrelation function defines a medium with a fractal dimension of 2.78, a horizontal characteristic length of about 244m and a vertical correlation of about 133m (aspect ratio is 2:1). It has an essentially trimodal velocity (lithology) population consisting of 37 per cent silicicgneiss, 43 per cent mafic amphibolites, and 20 per cent schists. This map is representative of 30-40 per cent of Laxfordian rocks. the second map is a plan view which can be rotated 90° about an axis perpendicular to strike to give a cross-section. This map is characterized by a fractal dimension of 2.55, with a horizontal correlation length of about 111m and a vertical correlation of about 38m (aspect ratio 3:1). It has a nearly bimodal population consisting of 77 per cent silicic gneisses and 22 per cent mafic amphibotites. It is representative of 60-70 per cent of Laxfordian rocks.Lastly we examine the seismic response of an upper to middle crust based on our statistical models using acoustic and elastic 2-D finite-difference synthetic seismograms. Short-offset shot records demonstrate that a Lewisian upper crust produces scattered waves which significantly disrupt signals reflecting from deeper levels. Measurements of transmission scattering Q, and coda decay rates confirm that seismic scattering in Lewisian-type crust is strong. the migrated CMP response of a Lewisian crustal model shows the characteristic ‘salt and pepper’ pattern often observed in the upper crust, and described, incorrectly, as ‘transparent'. We suggest that ‘translucent’ is a more appropriate descriptor.
    Type of Medium: Electronic Resource
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