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  • 1
    Electronic Resource
    Electronic Resource
    Strategies for structure solution and refinement of small organic molecules from electron diffraction data and limitations of the simulation approach (2000)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 436-450 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: In recent years, a series of non-linear optically active bis(benzylidene) ketones have been synthesized and investigated by electron crystallography. In most cases, structure refinement was possible by combining electron diffraction analysis and quantum-mechanical calculations with maximum-entropy methods. However, when the torsional angles between the phenyl rings and the C=C double bonds are strongly affected by the crystal field, this method fails because packing-energy calculations are not sufficiently sensitive. This problem can be solved by refining the approximate model with SHELXL, if the data set is sufficiently accurate and the model close to the correct structure. Here it is shown that a considerably superior data set can be obtained at 300 kV with on-line data acquisition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767300006668
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  • 2
    Electronic Resource
    Electronic Resource
    Fibroblast adhesion to pitted surfaces (2003)
    Oxford, UK : Munksgaard International Publishers
    Journal of clinical periodontology 30 (2003), S. 0 
    Details
    ISSN: 1600-051X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1600-051X.30.s4.3_252.x
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  • 3
    Electronic Resource
    Electronic Resource
    African vegetation controlled by tropical sea surface temperatures in the mid-Pleistocene period (2003)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 422 (2003), S. 418-421 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The dominant forcing factors for past large-scale changes in vegetation are widely debated. Changes in the distribution of C4 plants—adapted to warm, dry conditions and low atmospheric CO2 concentrations—have been attributed to marked changes in environmental ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature01500
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  • 4
    Electronic Resource
    Electronic Resource
    The impact of gastrointestinal symptoms on health status in patients with cardiovascular disease (2003)
    Oxford, UK : Blackwell Science Ltd
    Alimentary pharmacology & therapeutics 17 (2003), S. 0 
    Details
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background : Drugs for the management of cardiovascular disease may provoke gastrointestinal discomfort and complications.Aim : To evaluate whether upper gastrointestinal symptoms affect the health status of patients with cardiovascular disease.Methods : Two weeks after discharge, 958 consecutive patients, who had been admitted to the Coronary Care Unit of the University Hospital Nijmegen between January and September 2001, were sent a questionnaire for the evaluation of gastrointestinal symptoms and health status.Results : The questionnaire was returned by 632 patients (66%), with 334 patients (53%) reporting gastrointestinal symptoms. The self-rated health status (mean and 95% confidence interval), evaluated by visual analogue scale, was 70 (68–72) for patients without and 61 (59–63) for patients with gastrointestinal symptoms (P = 0.001). Patients with gastrointestinal symptoms reported significantly higher rates of problems with mobility (50% vs. 37%), self-care (19% vs. 10%), usual activities (70% vs. 52%), pain/discomfort (96% vs. 38%) and anxiety/depression (41% vs. 20%) when compared with those without gastrointestinal symptoms.Conclusion : Upper gastrointestinal symptoms strongly impaired the health status of patients with cardiovascular disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2036.2003.01542.x
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  • 5
    Electronic Resource
    Electronic Resource
    Gastric acid-suppressive therapy and community-acquired respiratory infections (2003)
    Oxford, UK : Blackwell Science Ltd
    Alimentary pharmacology & therapeutics 18 (2003), S. 0 
    Details
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background : Bacteria and viruses have been detected in the stomach of patients during acid-suppressive therapy.Aim : To investigate whether subjects using acid-suppressive drugs more often develop community-acquired respiratory infections when compared to those who do not use acid-suppressive drugs.Methods : 700 study subjects were recruited during a single week in December 2002. Information on the prevalence of clinical manifestations of infections and complications in the preceding month was assessed by questionnaire. Furthermore, subjects were asked to report antibiotic therapy and physician visits related to possible infection.Results : Questionnaires were returned by 405 subjects (58%). Consumption of acid-suppressive drugs was reported by 91 individuals, of whom 79 used proton-pump inhibitors (20%) and 12 H2-receptor antagonists (3%). Overall, 101 (25%) responders reported clinical manifestations of respiratory infection in the preceding month. Subjects using acid-suppressive drugs were 2.34 times [95% confidence interval (CI) 1.4–4.1] more likely to have clinical manifestations of infection than individuals not using acid-suppressive drugs. Subjects using acid-suppressive drugs visited a physician 3.72 times more often (95% CI 2.1–6.8) for an infection and received antibiotic therapy 4.19 times more often (95% CI 2.2–8.1) in comparison to individuals not using acid-suppressive drugs.Conclusions : Subjects using acid-suppressive drugs more often reported community-acquired respiratory infections in comparison to those who did not use acid-suppressive drugs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2036.2003.01744.x
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  • 6
    Electronic Resource
    Electronic Resource
    Corpus gastritis in patients with endoscopic diagnosis of reflux oesophagitis and Barrett's oesophagus (2002)
    Oxford UK : Blackwell Science Ltd
    Alimentary pharmacology & therapeutics 16 (2002), S. 0 
    Details
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A high level of gastric acid secretion is considered to be a risk factor for reflux oesophagitis or Barrett's oesophagus. Corpus gastritis may have a protective effect on the oesophagus, because of decreased gastric acid output.〈section xml:id="abs1-2"〉〈title type="main"〉Aim:To determine if corpus gastritis is associated with reflux oesophagitis or Barrett's oesophagus.〈section xml:id="abs1-3"〉〈title type="main"〉Methods:Three antral and two corpus biopsies were taken from consecutive patients in whom Helicobacter pylori testing was requested during endoscopy at a single centre between January 1995 and May 1997. Antral and corpus gastritis was studied by histology; H. pylori was studied by histology, culture and CLO test. A regression model was used to test for correlation between reflux oesophagitis, Barrett's oesophagus and risk factors.〈section xml:id="abs1-4"〉〈title type="main"〉Results:During the study period, 676 patients had biopsies taken during upper gastrointestinal endoscopy. Endoscopic signs of reflux oesophagitis and Barrett's oesophagus were observed in 125 and 23 patients, respectively. Corpus gastritis was found in 59% of patients without reflux oesophagitis or Barrett's oesophagus, 45% of patients with reflux oesophagitis and 30% of patients with Barrett's oesophagus. Two hundred and fifty-seven patients underwent follow-up endoscopy after H. pylori therapy. During a mean follow-up of 3 months, the incidence of reflux oesophagitis was not statistically different for patients with healing of corpus gastritis (10/98; 10%) and patients with persistent gastritis (8/97; 8%).〈section xml:id="abs1-5"〉〈title type="main"〉Conclusions:Corpus gastritis was less common in patients with an endoscopic diagnosis of reflux oesophagitis or Barrett's oesophagus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2036.2002.01245.x
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  • 7
    Electronic Resource
    Electronic Resource
    Review article: treatment of Helicobacter pylori infection with ranitidine bismuth citrate- or proton pump inhibitor-based triple therapies (2000)
    Oxford UK : Blackwell Science Ltd
    Alimentary pharmacology & therapeutics 14 (2000), S. 0 
    Details
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Triple therapy, combining a proton pump inhibitor with clarithromycin (C) and either amoxycillin (A) or a nitro-imidazole (I) is the standard in Helicobacter pylori eradication therapy. Recently, triple therapies based on ranitidine bismuth citrate (RBC) have emerged as an alternative. This review examines the current literature for studies directly comparing proton pump inhibitor- with RBC-based triple therapies. Seventeen studies were identified, of which three have been published as a full paper.Eradication rates in an intention-to-treat analysis ranged from 51 to 98%. No large difference in cure rates between the different regimens was demonstrated, although the RBC-I-C combination was somewhat superior. No definite conclusions could be made about the impact of metronidazole or clarithromycin resistance since only three studies performed a formal resistance analysis. No serious side-effects were reported, and dropout rates were equal for the two regimens.Both RBC- and proton pump inhibitor-based triple therapies are highly effective. If one prefers a imidazole/clarithromycin combination the evidence presented here suggests that RBC should be used instead of a proton pump inhibitor. Larger studies comparing both forms of triple therapy, using proper resistance analysis, are needed before final conclusions can be reached regarding efficacy in the setting of bacterial resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2036.2000.00798.x
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  • 8
    Electronic Resource
    Electronic Resource
    Helicobacter pylori infection as a risk factor for gastrointestinal symptoms in patients using aspirin to prevent ischaemic heart disease (2001)
    Oxford UK : Blackwell Science Ltd
    Alimentary pharmacology & therapeutics 15 (2001), S. 0 
    Details
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Aspirin use in the secondary prevention of ischaemic heart disease may provoke gastrointestinal discomfort.〈section xml:id="abs1-2"〉〈title type="main"〉Objective:To register gastrointestinal symptoms and complications in patients with cardiovascular disease using aspirin and to relate these symptoms to infection with H. pylori.〈section xml:id="abs1-3"〉〈title type="main"〉Methods:Blood samples were obtained from 398 consecutive patients in the Coronary-Care Unit, University Hospital Nijmegen and analysed for serum antibody levels to H. pylori infection. Questionnaires were sent 2 weeks after discharge to assess gastrointestinal symptoms.〈section xml:id="abs1-4"〉〈title type="main"〉Results:Questionnaires were returned by 314 patients (79%). A total of 183 out of 314 patients (46%) reported gastrointestinal symptoms. Of 238 patients using 80–100 mg aspirin daily, 145 (61%) recorded gastrointestinal symptoms. Besides aspirin, the use of calcium antagonists was correlated with gastrointestinal symptoms. Of the 128 patients using calcium antagonists, 84 (66%) reported gastrointestinal symptoms. The prevalence of gastrointestinal symptoms in H. pylori-positive and -negative patients using aspirin was 48% and 52%, respectively.〈section xml:id="abs1-5"〉〈title type="main"〉Conclusions:Two weeks after discharge almost 50% of the patients with cardiovascular disease experienced gastrointestinal symptoms, especially patients using aspirin or calcium antagonists. Patients seropositive for H. pylori and using aspirin or calcium antagonists did not have more gastrointestinal discomfort compared to non-infected patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2036.2001.01016.x
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  • 9
    Electronic Resource
    Electronic Resource
    A systematic comparison of triple therapies for treatment of Helicobacter pylori infection with proton pump inhibitor/ ranitidine bismuth citrate plus clarithromycin and either amoxicillin or a nitroimidazole (2001)
    Oxford UK : Blackwell Science Ltd
    Alimentary pharmacology & therapeutics 15 (2001), S. 0 
    Details
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Triple therapies with proton pump inhibitor/ranitidine bismuth citrate (RBC), clarithromycin (C) and either amoxicillin (A) or a nitroimidazole (I) are widely accepted as treatment for Helicobacter pylori infection. However, it is not clear which of these antibiotic combinations should be preferred.〈section xml:id="abs1-2"〉〈title type="main"〉Aim:To evaluate whether there is a difference in efficacy between triple therapies with proton pump inhibitor/RBC, clarithromycin and either amoxicillin or a nitroimidazole.〈section xml:id="abs1-3"〉〈title type="main"〉Methods:The literature was examined for randomized trials comparing proton pump inhibitor/RBC-C-A and proton pump inhibitor/RBC-C-I. Studies were grouped according to the type of acid inhibitor used (proton pump inhibitor or RBC) and differences between pooled cure rates were calculated.〈section xml:id="abs1-4"〉〈title type="main"〉Results:Forty-seven studies were identified: seven using RBC, 39 using proton pump inhibitor, one using both. RBC-C-I was somewhat superior to RBC-C-A, although this difference only reached statistical significance in intention-to-treat analysis. Overall, proton pump inhibitor-C-I and proton pump inhibitor-C-A were equally effective, but in nitroimidazole-susceptible strains, proton pump inhibitor-C-I performed better, in nitroimidazole-resistant strains, proton pump inhibitor-C-A performed better. No serious side-effects were reported and pooled drop-out rates were equal.〈section xml:id="abs1-5"〉〈title type="main"〉Conclusions:In general, proton pump inhibitor-C-I and proton pump inhibitor-C-A are equally effective and therefore other factors such as local prevalence of resistant strains, cost of therapy and options for second-line treatment should determine which regimen should be preferred. When using RBC, the RBC-C-I combination is somewhat superior to RBC-C-A.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2036.2001.00974.x
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  • 10
    Electronic Resource
    Electronic Resource
    Health-related quality of life of patients with gastrointestinal symptoms (2004)
    Oxford, UK : Blackwell Science Ltd
    Alimentary pharmacology & therapeutics 20 (2004), S. 0 
    Details
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background : Little is known about the variation in health-related quality of life among patients with different presentations of gastrointestinal symptoms.Aim : To study the association between health-related quality of life and presentations of gastrointestinal symptoms.Methods : Health-related quality of life and demographic information was obtained from 873 patients referred to the hospital for endoscopy, using a questionnaire.Results : A total of 436 patients (50%) reported predominantly upper gastrointestinal symptoms, 344 (39%) predominantly lower symptoms, and 93 (11%) patients reported both upper and lower symptoms. Patients with mild, moderate and severe symptoms, reported mean scores on a 100-point visual analogue scale (95% CI) of 90 (79–100), 75 (64–86) and 64 (53–76), respectively (P 〈 0.001). Mean visual analogue scale scores (95% CI) almost linearly declined from 81 (77–85) to 49 (46–52) for those with one to those with more than eight symptoms. Patients who reported upper gastrointestinal symptoms and in particular epigastric pain, bloating and vomiting had significantly impaired health status in comparison to patients without these symptoms (P 〈 0.05).Conclusions : Severity of gastrointestinal symptoms is the most important factor in affecting health status, followed by the numbers and type of gastrointestinal symptoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2036.2004.02076.x
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