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Mihailova A, Liebisch B, Islam MD, Carstensen JM, Cannavan A, Kelly SD. The use of multispectral imaging for the discrimination of Arabica and Robusta coffee beans. Food Chem X 2022; 14:100325. [PMID: 35586030 PMCID: PMC9108882 DOI: 10.1016/j.fochx.2022.100325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 04/19/2022] [Accepted: 05/03/2022] [Indexed: 11/16/2022] Open
Abstract
Arabica coffee beans are sold at twice the price, or more, compared to Robusta beans and consequently are susceptible to economically motivated adulteration by substitution. There is a need for rapid, non-destructive, and efficient analytical techniques for monitoring the authenticity of Arabica coffee beans in the supply chain. In this study, multispectral imaging (MSI) was applied to discriminate roasted Arabica and Robusta coffee beans and perform quantitative prediction of Arabica coffee bean adulteration with Robusta. The Orthogonal Partial Least Squares Discriminant Analysis (OPLS-DA) model, built using selected spectral and morphological features from individual coffee beans, achieved 100% correct classification of the two coffee species in the test dataset. The OPLS regression model was able to successfully predict the level of adulteration of Arabica with Robusta. MSI analysis has potential as a rapid screening tool for the detection of fraud issues related to the authenticity of Arabica coffee beans.
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Affiliation(s)
- Alina Mihailova
- Food Safety and Control Laboratory, Joint FAO/IAEA Centre of Nuclear Techniques in Food and Agriculture, Department of Nuclear Sciences and Applications, International Atomic Energy Agency, Vienna International Centre, PO Box 100, 1400 Vienna, Austria
| | - Beatrix Liebisch
- Food Safety and Control Laboratory, Joint FAO/IAEA Centre of Nuclear Techniques in Food and Agriculture, Department of Nuclear Sciences and Applications, International Atomic Energy Agency, Vienna International Centre, PO Box 100, 1400 Vienna, Austria
| | - Marivil D. Islam
- Food Safety and Control Laboratory, Joint FAO/IAEA Centre of Nuclear Techniques in Food and Agriculture, Department of Nuclear Sciences and Applications, International Atomic Energy Agency, Vienna International Centre, PO Box 100, 1400 Vienna, Austria
| | | | - Andrew Cannavan
- Food Safety and Control Section, Joint FAO/IAEA Centre of Nuclear Techniques in Food and Agriculture, Department of Nuclear Sciences and Applications, International Atomic Energy Agency, Vienna International Centre, PO Box 100, 1400 Vienna, Austria
| | - Simon D. Kelly
- Food Safety and Control Laboratory, Joint FAO/IAEA Centre of Nuclear Techniques in Food and Agriculture, Department of Nuclear Sciences and Applications, International Atomic Energy Agency, Vienna International Centre, PO Box 100, 1400 Vienna, Austria
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Srinuttrakul W, Mihailova A, Islam MD, Liebisch B, Maxwell F, Kelly SD, Cannavan A. Geographical Differentiation of Hom Mali Rice Cultivated in Different Regions of Thailand Using FTIR-ATR and NIR Spectroscopy. Foods 2021; 10:foods10081951. [PMID: 34441727 PMCID: PMC8392001 DOI: 10.3390/foods10081951] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 08/16/2021] [Accepted: 08/18/2021] [Indexed: 11/20/2022] Open
Abstract
Although Hom Mali rice is considered the highest quality rice in Thailand, it is susceptible to adulteration and substitution. There is a need for rapid, low-cost and efficient analytical techniques for monitoring the authenticity and geographical origin of Thai Hom Mali rice. In this study, two infrared spectroscopy techniques, Fourier-transform infrared spectroscopy with attenuated total reflection (FTIR-ATR) and near-infrared (NIR) spectroscopy, were applied and compared for the differentiation of Thai Hom Mali rice from two geographical regions over two production years. The Orthogonal Projections to Latent Structures Discriminant Analysis (OPLS-DA) model, built using spectral data from the benchtop FTIR-ATR, achieved 96.97% and 100% correct classification of the test dataset for each of the production years, respectively. The OPLS-DA model, built using spectral data from the portable handheld NIR, achieved 84.85% and 86.96% correct classification of the test dataset for each of the production years, respectively. Direct NIR analysis of the polished rice grains (i.e., no sample preparation) was determined as reliable for analysis of ground rice samples. FTIR-ATR and NIR spectroscopic analysis both have significant potential as screening tools for the rapid detection of fraud issues related to the geographical origin of Thai Hom Mali rice.
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Affiliation(s)
- Wannee Srinuttrakul
- Research and Development Division, Thailand Institute of Nuclear Technology, Sai Mun, Ongkharak, Nakhon Nayok 26120, Thailand;
| | - Alina Mihailova
- Food and Environmental Protection Laboratory, Joint FAO/IAEA Centre of Nuclear Techniques in Food and Agriculture, Department of Nuclear Sciences and Applications, International Atomic Energy Agency, Vienna International Centre, P.O. Box 100, 1400 Vienna, Austria; (M.D.I.); (B.L.); (F.M.); (S.D.K.); (A.C.)
- Correspondence:
| | - Marivil D. Islam
- Food and Environmental Protection Laboratory, Joint FAO/IAEA Centre of Nuclear Techniques in Food and Agriculture, Department of Nuclear Sciences and Applications, International Atomic Energy Agency, Vienna International Centre, P.O. Box 100, 1400 Vienna, Austria; (M.D.I.); (B.L.); (F.M.); (S.D.K.); (A.C.)
| | - Beatrix Liebisch
- Food and Environmental Protection Laboratory, Joint FAO/IAEA Centre of Nuclear Techniques in Food and Agriculture, Department of Nuclear Sciences and Applications, International Atomic Energy Agency, Vienna International Centre, P.O. Box 100, 1400 Vienna, Austria; (M.D.I.); (B.L.); (F.M.); (S.D.K.); (A.C.)
| | - Florence Maxwell
- Food and Environmental Protection Laboratory, Joint FAO/IAEA Centre of Nuclear Techniques in Food and Agriculture, Department of Nuclear Sciences and Applications, International Atomic Energy Agency, Vienna International Centre, P.O. Box 100, 1400 Vienna, Austria; (M.D.I.); (B.L.); (F.M.); (S.D.K.); (A.C.)
| | - Simon D. Kelly
- Food and Environmental Protection Laboratory, Joint FAO/IAEA Centre of Nuclear Techniques in Food and Agriculture, Department of Nuclear Sciences and Applications, International Atomic Energy Agency, Vienna International Centre, P.O. Box 100, 1400 Vienna, Austria; (M.D.I.); (B.L.); (F.M.); (S.D.K.); (A.C.)
| | - Andrew Cannavan
- Food and Environmental Protection Laboratory, Joint FAO/IAEA Centre of Nuclear Techniques in Food and Agriculture, Department of Nuclear Sciences and Applications, International Atomic Energy Agency, Vienna International Centre, P.O. Box 100, 1400 Vienna, Austria; (M.D.I.); (B.L.); (F.M.); (S.D.K.); (A.C.)
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Hoi J, Lieder B, Liebisch B, Czech C, Hans J, Ley JP, Somoza V. TRPA1 Agonist Cinnamaldehyde Decreases Adipogenesis in 3T3-L1 Cells More Potently than the Non-agonist Structural Analog Cinnamyl Isobutyrate. ACS Omega 2020; 5:33305-33313. [PMID: 33403292 PMCID: PMC7774270 DOI: 10.1021/acsomega.0c05083] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2020] [Accepted: 12/02/2020] [Indexed: 05/13/2023]
Abstract
The cinnamon-derived bioactive aroma compound cinnamaldehyde (CAL) has been identified as a promising antiobesity agent, inhibiting adipogenesis and decreasing lipid accumulation in vitro as well as in animal models. Here, we investigated the antiadipogenic effect of cinnamyl isobutyrate (CIB), another cinnamon-derived aroma compound, in comparison to CAL in 3T3-L1 adipocyte cells. In a concentration of 30 μM, CIB reduced triglyceride (TG) and phospholipid (PL) accumulation in 3T3-L1 pre-adipocytes by 21.4 ± 2.56 and 20.7 ± 2.05%, respectively. CAL (30 μM), in comparison, decreased TG accumulation by 37.5 ± 1.81% and PL accumulation by 28.7 ± 1.83%, revealing the aldehyde to be the more potent antiadipogenic compound. The CIB- and CAL-mediated inhibition of lipid accumulation was accompanied by downregulation of essential adipogenic transcription factors PPARγ, C/EBPα, and C/EBPβ on gene and protein levels, pointing to a compound-modulated effect on adipogenic signaling cascades. Coincubation experiments applying the TRPA-1 inhibitor AP-18 demonstrated TRPA1 dependency of the CAL, but not the CIB-induced antiadipogenic effect.
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Affiliation(s)
- Julia
K. Hoi
- Department
of Physiological Chemistry, Faculty of Chemistry, University of Vienna, Althanstraße 14, 1300 Vienna, Austria
| | - Barbara Lieder
- Department
of Physiological Chemistry, Faculty of Chemistry, University of Vienna, Althanstraße 14, 1300 Vienna, Austria
| | - Beatrix Liebisch
- Department
of Physiological Chemistry, Faculty of Chemistry, University of Vienna, Althanstraße 14, 1300 Vienna, Austria
| | - Christiane Czech
- Department
of Physiological Chemistry, Faculty of Chemistry, University of Vienna, Althanstraße 14, 1300 Vienna, Austria
| | - Joachim Hans
- Symrise
AG, Muehlenfeldstraße
1, 37603 Holzminden, Germany
| | - Jakob P. Ley
- Symrise
AG, Muehlenfeldstraße
1, 37603 Holzminden, Germany
| | - Veronika Somoza
- Leibniz
Institute for Food Systems Biology at the Technical University of
Munich, Chair of Nutritional Systems Biology, Technical University of Munich, Lise-Meitner-Strasse 34, 85345 Freising, Germany
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Frey B, Kreiner G, Liebisch B, Sauermann S, Gössinger HD. Irregularity of the ventricular rhythm during atrial fibrillation: effect of slow atrioventricular nodal pathway ablation. Clin Cardiol 2009; 22:665-72. [PMID: 10526693 PMCID: PMC6656205 DOI: 10.1002/clc.4960221015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND The contribution of dual atrioventricular (AV) nodal pathway physiology to the irregularity of the ventricular rhythm during atrial fibrillation has not been clarified. HYPOTHESIS This study was performed to assess the effects of slow AV nodal pathway ablation on the irregularity of the ventricular rhythm during atrial fibrillation. METHODS Irregularity of the ventricular rhythm was quantified using analysis of heart rate variability. In 20 patients with AV nodal reentrant tachycardia, absolute heart rate variability during atrial fibrillation was quantified before and after slow AV nodal pathway ablation by the standard deviation of all NN intervals (SDNN). Relative heart rate variability was determined by computing the coefficient of variation, SDNN normalized for the standard deviation of the mean ventricular cycle length (MVCL-AF). RESULTS The slope of the regression between MVCL-AF and SDNN was significantly more gradual after slow pathway ablation (slope 0.39 vs. 0.23, p < 0.001). Coefficient of variation increased in 12 patients with heart rates > 120 beats/min at baseline (18.6 +/- 3.9 vs. 22.1 +/- 2.7% MVCL-AF, p < 0.05), but decreased in 8 patients with heart rates < 120 beats/min at baseline (25.6 +/- 3.1 vs. 22.2 +/- 2.2% MVCL-AF, p = 0.05). Furthermore, coefficient of variation correlated with MVCL-AF only at baseline (slope 0.034, r = 0.66), but no relation was found after slow pathway ablation (slope 0, r = 0). CONCLUSIONS Slow AV nodal pathway ablation alters the relation between absolute heart rate variability and mean ventricular rate during atrial fibrillation and eliminates cycle length dependency of relative heart rate variability. These data indicate that dual AV nodal pathway physiology contributes to the irregularity of the ventricular rhythm during atrial fibrillation.
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Affiliation(s)
- B Frey
- Department of Cardiology, University of Vienna, Austria
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5
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Weide-Botjes M, Liebisch B, Schwarz S, Watts JL. Molecular characterization of Salmonella enterica subsp. enterica serovar choleraesuis field isolates and differentiation from homologous live vaccine strains suisaloral and SC-54. J Clin Microbiol 1996; 34:2460-3. [PMID: 8880500 PMCID: PMC229294 DOI: 10.1128/jcm.34.10.2460-2463.1996] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Four independent molecular methods were used to characterize the Salmonella enterica subsp. enterica serovar choleraesuis live vaccine strains SC-54 and Suisaloral and to differentiate them from S. choleraesuis field isolates. Plasmid analysis revealed the presence of seven plasmid profiles. A virulence plasmid of 52-kbp was identified by hybridization with an spvB-spvC gene probe in each of the S. choleraesuis field isolates and in the Suisaloral vaccine strain, but not in the SC-54 vaccine strain. Ribotyping, performed with a gene probe that recognized 23S, 16S, and 5S rRNA genes, resulted in three closely related hybridization patterns. IS200 elements were not detected in the field isolates or in the two S. choleraesuis live vaccine strains. Macrorestriction analysis with the enzymes XbaI, SpeI, NotI, and SfiI differentiated the 29 S. choleraesuis strains included in this study into 10, 13, 8, and 13 different fragment patterns, respectively. While the Suisaloral vaccine strain showed a unique XbaI macrorestriction pattern, the fragment patterns of the SC-54 strain obtained with the different enzymes were shared by 2 to 18 S. choleraesuis field strains. A combination of plasmid analysis and macrorestriction analysis proved to be most suitable for the molecular typing of S. choleraesuis and the differentiation of both live vaccine strains from field isolates of this serovar.
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Affiliation(s)
- M Weide-Botjes
- Institut für Kleintierforschung Celle/Merbitz, Bundesforschungsanstalt für Landwirtschaft Braunschweig-Völkenrode (FAL), Celle, Germany
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6
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Liebisch B, Schwarz S. [Molecular biological methods for epidemiological typing of Salmonella--a review]. Berl Munch Tierarztl Wochenschr 1996; 109:348-54. [PMID: 9054336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Various molecular typing methods for the analysis of zoonotic bacterial pathogens have been developed during the last decade. Because of their high discriminatory power, these methods have been increasingly used even in routine diagnostics. The description of several independent genotypic characteristics in addition to that of the phenotypic properties enables a complex and exact identification of bacterial strains. Molecular techniques such as plasmid analysis, ribotyping. IS200 typing as well as macrorestriction analysis represent components of a basic molecular typing system for Salmonella isolates which proved to be suitable for various epidemiological applications.
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Affiliation(s)
- B Liebisch
- Institut für Kleintierforschung Celle/Merbitz, Bundesforschungsanstalt für Landwirtschaft Braunschweig-Völkenrode (FAL)
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7
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Liebisch B, Kletzmayr J, Webber F, Schneider B. Reproducibility of ambulatory blood pressure measurement in renal hypertension. Dippers and non-dippers. Ann N Y Acad Sci 1996; 783:333-4. [PMID: 8853661 DOI: 10.1111/j.1749-6632.1996.tb26736.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- B Liebisch
- Department of Nephrology and Dialysis, University of Vienna Medical School, Austria
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8
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Liebisch B, Schwarz S. Evaluation and comparison of molecular techniques for epidemiological typing of Salmonella enterica subsp. enterica serovar dublin. J Clin Microbiol 1996; 34:641-6. [PMID: 8904430 PMCID: PMC228862 DOI: 10.1128/jcm.34.3.641-646.1996] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
A total of 28 unrelated isolates of the Salmonella enterica subsp. enterica serovar dublin (S. dublin) collected during a 6-year period, as well as four samples of the S. dublin live vaccine strain Bovisaloral and its prototype strain S. dublin 442/039, were investigated by different molecular typing methods for the following reasons: (i) to find the most discriminatory method for the epidemiological typing of isolates belonging to this Salmonella serovar and (ii) to evaluate these methods for their capacity to discriminate among the live vaccine strain Bovisaloral, its prototype strain S. dublin 442/039, and field isolates of the serovar dublin. Five different plasmid profiles were observed; a virulence plasmid of 76 kbp as identified by hybridization with an spvB-spvC gene probe was present in all isolates. The detection of 16S rRNA genes and that of IS200 elements proved to be unsuitable for the epidemiological typing of S. dublin; only one hybridization pattern could be observed with each of these methods. The results obtained from macrorestriction analysis strongly depended on the choice of restriction enzyme. While the enzyme NotI yielded the lowest discriminatory index among all enzymes tested, it was the only enzyme that allowed discrimination between the Bovisaloral vaccine strain and its prototype strain. In contrast to the enzymes XbaI and SpeI, which only differentiated among the S. dublin field isolates, XhoI as well as AvrII also produced restriction fragment patterns of the Bovisaloral strain and of its prototype strain that were not shared by any of the S. dublin field isolates. Macrorestriction analysis proved to be the most discriminatory method not only for the epidemiological typing of S. dublin field isolates but also for the identification of the S. dublin live vaccine strain Bovisaloral.
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Affiliation(s)
- B Liebisch
- Institut fur Kleintierforschung Celle/Merbitz der Bundesforschungsanstalt fur Landwirtschaft Braunschweig-Volkenrode, Celle, Germany
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9
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Abstract
A collection of 31 epidemiologically unrelated Salmonella enterica subsp. enterica serovar Enteritidis (S. Enteritidis) isolates obtained during a 12-year period was characterised by different molecular typing methods. Plasmid profile analysis, the detection of plasmid-encoded virulence genes and ribotyping allowed little or no further differentiation amongst these isolates. Two different hybridisation patterns were observed by IS200-typing of the S. Enteritidis isolates. However, pulsed-field gel electrophoretic separation of restriction endonuclease-digested whole-cell DNA provided a high level of discrimination amongst the 31 S. Enteritidis isolates. This could be increased by the comparative use of the three suitable restriction endonucleases XbaI, SpeI and NotI. Thus, pulsed-field gel electrophoresis proved to be superior in its discriminatory value to other molecular methods such as plasmid analysis, ribotyping or IS200-typing and represents a most helpful tool for the epidemiological typing of S. Enteritidis isolates.
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Affiliation(s)
- B Liebisch
- Institut für Kleintierforschung, Bundesforschungsanstalt für Landwirtschaft (FAL), Celle, Germany
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10
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Abstract
In the present study 56 streptococci of serological group G and L isolated from various animal species and from humans were investigated for tetracycline and minocycline resistance and for the presence of genes conferring this combined resistance. Among the 45 group G streptococci, 2 isolates from dogs, 3 from cattle and 2 from humans, respectively, as well as all 11 group L streptococci isolated from cattle, pigs or poultry were resistant to tetracycline and simultaneously to minocycline. The restriction endonuclease digested and blotted DNA-preparation of the tetracycline-and minocycline resistant group G streptococci from dogs and humans hybridized with the tet (M) gene probe, those from bovines with the tet (O) gene probe. Six group L streptococci carried the gene tet (M), whereas 5 isolates harboured the gene tet (O). The tet (M)-and tet (O) gene probes recognized complementary sequences on EcoRI-fragments of various sizes.
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Affiliation(s)
- I Soedarmanto
- Institut für Kleintierforschung Celle/Merbitz der Bundesforschungsanstalt für Landwirtschaft, Braunschweig-Völkenrode (FAL), Germany
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11
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Abstract
Staphylococcus intermedius cultures from dogs, pigeons, horses and mink were investigated for the prevalence of the insertion elements IS256 and IS257 in relation to their antibiotic resistance. Copies of IS256 could not be detected in any of the Staph. intermedius isolates tested whereas single copies of IS257 occurred in the isolates from dogs and horses. The mink strains did not harbour IS257 elements, whereas Staph. intermedius isolates from pigeons carried multiple copies of IS257 as predicted from the hybridization patterns obtained with a gene probe derived from the internal part of the IS257-encoded transposase gene. Independently of the origin of the Staph. intermedius isolates, all IS257 copies were found to be located in the chromosomal DNA. The large number of chromosomal IS257 copies in the pigeon strains might help to explain chromosomal multiresistance in many of those strains.
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Affiliation(s)
- J Hesselbarth
- Institut für Kleintierforschung der Bundesforschungsanstalt für Landwirtschaft (FAL), Celle, Germany
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12
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Abstract
Salmonella enterica subsp. enterica serovar Typhimurium (Salm. Typhimurium) live vaccine strain Zoosaloral H was characterized by pulsed-field gel electrophoresis (PFGE). Each of the two suitable restriction enzymes, XbaI and SpeI, produced a unique restriction fragment pattern for this live vaccine strain which was not shared by field isolates of the same serovar. The characteristic fragment pattern proved to be stable during a 22 month observation period and was also not altered after animal passage of the vaccine strains. Thus PFGE analysis proved to be a helpful tool in the identification of Salm. Typhimurium live vaccine strain Zoosaloral H and its differentiation from wild-type isolates of the same serovar.
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Affiliation(s)
- S Schwarz
- Institut für Kleintierforschung Celle/Merbitz der Bundesforschungsanstalt für Landwirtschaft, Celle, Germany
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Schwarz S, Liebisch B. Use of ribotyping, IS200 typing and plasmid analysis for the identification of Salmonella enterica subsp. enterica serovar Typhimurium vaccine strain Zoosaloral H and its differentiation from wild type strains of the same serovar. Zentralbl Bakteriol 1994; 281:442-50. [PMID: 7727890 DOI: 10.1016/s0934-8840(11)80330-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Fifty Salmonella enterica subsp. enterica serovar Typhimurium (S. Typhimurium) isolates obtained from one vaccinated and three non-vaccinated poultry flocks as well as the commercially available vaccine strain Zoosaloral H and a S. Typhimurium reference strain were characterized genotypically to differentiate between S. Typhimurium live vaccine strain Zoosaloral H and wild type strains of the same serovar. Ribotyping revealed five different patterns one of which exclusively occurred in the vaccine strain. Seven different hybridization patterns could be observed by IS200-typing of the S. Typhimurium isolates; one of them was only detectable in the vaccine strain. Plasmid analysis showed that 51% of the S. Typhimurium isolates including the vaccine strain harboured large plasmids of approximately 60 MDa. Hybridization with a virulence gene probe identified only 48% of these large plasmids, including that of the vaccine strain, to carry this virulence-associated gene. However, restriction endonuclease analysis of the hybridizing plasmids showed that the virulence gene was located on HindIII fragments of different sizes in the plasmid of the S. Typhimurium vaccine strain Zoosaloral H and in the plasmids of the respective wild type S. Typhimurium isolates. Thus, ribotyping, IS200-typing and plasmid analysis represent at least three independent systems which allow the genotypic identification of the S. Typhimurium vaccine strain Zoosaloral H and its differentiation from wild type isolates of the same serovar.
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Affiliation(s)
- S Schwarz
- Institut für Kleintierforschung, Bundesforschungsanstalt für Landwirtschaft (FAL), Celle, Germany
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Abstract
The elimination of intravenously infused amino acids was evaluated in six patients with acute renal failure (ARF), 6 with conservatively treated chronic renal failure (CRF), 6 subjects receiving regular hemodialysis treatment (RDT), and 5 healthy control subjects. In ARF, CRF, and RDT groups, whole-body clearance (Cltot) of the 10 amino acids was elevated (113.5 +/- 1.5; 94.2 +/- 1.5 and 127.6 +/- 12.4, respectively, vs 85.2 +/- 4.8 mL.kg-1.min-1 in control subjects, P < 0.001). In ARF, Cltot of histidine, lysine, and methionine was higher and Cltot of phenylalanine and valine was lower as compared with control subjects. In CRF, Cltot of tryptophan and histidine was elevated and Cltot of phenylalanine was reduced; in RDT, Cltot of histidine, methionine, tryptophan, lysine, isoleucine, and leucine was raised. In all groups the relative clearance (% of total clearance) of phenylalanine and valine was reduced, and relative clearance of histidine and tryptophan was elevated. We conclude that in renal failure the elimination of amino acids from the intravascular space is profoundly altered and that the pattern of metabolic aberrations is similar in ARF, CRF, and RDT groups.
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Affiliation(s)
- W Druml
- Department of Medicine III, Vienna General Hospital, Austria
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15
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Traindl O, Falger S, Reading S, Banyai M, Liebisch B, Gisinger J, Templ E, Mayer G, Kovarik J. The effects of lisinopril on renal function in proteinuric renal transplant recipients. Transplantation 1993; 55:1309-13. [PMID: 8390733 DOI: 10.1097/00007890-199306000-00019] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Renal transplantation is frequently accompanied by systemic hypertension. In the present study we evaluated the effect of 2.5 mg lisinopril in 12 hypertensive and proteinuric renal graft recipients with stable graft function over 3 months. Only patients with absence of renal artery stenosis, at least as judged by technetium-scan imaging, were included. Lisinopril was effective in lowering systemic blood pressure. Mean arterial pressure was unchanged despite reduction of concomitant antihypertensive medication. Mean serum creatinine was unchanged during the study (1.95 +/- 0.8 mg/dl in the pretreatment period vs. 1.77 +/- 0.76 mg/dl in the intervention period, n.s.). Glomerular filtration rate remained stable (62.75 +/- 21.96 vs. 60.17 +/- 18.27 ml/min/1.73 m2, n.s.) whereas renal plasma flow increased (224.75 +/- 91.66 vs. 244.92 +/- 94.13 ml/min/1.73m2, P < 0.01), leading to a drop in filtration fraction (31.4 +/- 12.4 vs. 26.8 +/- 8.6, n.s.). Renal vascular resistance was significantly reduced following angiotensin-converting enzyme (ACE) inhibitor therapy (26,447 +/- 14,574 vs. 23,425 +/- 12,430 dyne sec cm-5/1.73 m2, P < 0.01). Mean daily proteinuric decreased significantly (2.98 +/- 2.06 vs. 2.06 +/- 2.29 g, P < 0.01) whereas in a group of patients with comparable blood pressure but without ACE inhibitor therapy and similar degree of proteinuria, 24-hr proteinuria remained stable. No severe side effects were observed--in particular, mean serum potassium showed only a slight increase and no clinically significant hyperkalemic condition was observed. When lisinopril therapy was withdrawn after 3 months, blood pressure increased in all patients, requiring reinstitution of additional antihypertensive medication. Renal hemodynamic parameters and daily proteinuria returned to baseline values. We conclude that 2.5 mg lisinopril daily was safe and effective in this group of renal transplant recipients and showed a good antihypertensive as well as antiproteinuric effect.
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Affiliation(s)
- O Traindl
- Department of Internal Medicine III, University of Vienna, Austria
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16
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Abstract
Two chronically ill patients with limited nutritional intake during several weeks developed prolonged lactic acidosis. As no other causes of hyperlactaemia could be identified, thiamine deficiency was suspected. Supplementation of 600 mg thiamine resulted in a rapid normalisation of serum lactate levels (in patient 1 from 10.9-2.4 mmol/l; in patient 2 from 11.8-2.0 mmol/l) and acid base status (patient 1: pH from 7.11-7.30, bicarbonate from 8.6-21.2 mmol/l; patient 2: pH from 7.24-7.46, bicarbonate from 16-28 mmol/l; before and after treatment, respectively). Thiamine deficiency was confirmed by the degree of stimulation of erythrocyte transketolase activation by adding thiamine pyrophosphate, evaluated before and after thiamine replacement therapy. Stimulation decreased in patient 1 from 170% to 17% and in patient 2 from 20% to 0%, respectively. In addition to the metabolic derangement right ventricular heart failure was confirmed by echocardiography in both patients and again this was rapidly reversible by thiamine supplementation. We conclude that in malnourished patients unexplained prolonged lactic acidosis may result from thiamine deficiency, which is rapidly reversible by thiamine replacement therapy.
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Affiliation(s)
- C Madl
- Department of Medicine IV University of Vienna, Währinger Gürtel 18-20, A-1090 Vienna, Austria
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Stockenhuber F, Gottsauner-Wolf M, Marosi L, Liebisch B, Kurz RW, Balcke P. Plasma levels of endothelin in chronic renal failure and after renal transplantation: impact on hypertension and cyclosporin A-associated nephrotoxicity. Clin Sci (Lond) 1992; 82:255-8. [PMID: 1312409 DOI: 10.1042/cs0820255] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
1. Plasma levels of endothelin were measured in 30 patients with chronic renal failure, 32 patients on chronic haemodialysis treatment and 25 renal graft recipients with stable renal graft function. 2. In patients with chronic renal failure as well as in patients on regular haemodialysis treatment, mean plasma levels of endothelin were significantly increased (4.59 +/- 2.09 pg/ml, 10.08 +/- 3.12 pg/ml, respectively) when compared with normal subjects (1.88 +/- 0.6 pg/ml, P less than 0.01, P less than 0.001, respectively). 3. In the group with chronic renal failure a positive correlation between the plasma level of endothelin and the plasma concentration of creatinine was observed (P less than 0.003). 4. Renal graft recipients on cyclosporin A with stable renal graft function had a normal plasma level of endothelin suggesting that cyclosporin A nephrotoxicity is not mediated by endothelin. 5. Hypertensive patients with chronic renal failure or on regular haemodialysis and hypertensive renal graft recipients did not differ from the corresponding normotensive population with regard to the plasma level of endothelin, demonstrating that an increased plasma level of endothelin does not play a major role in the pathogenesis of renal hypertension.
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Affiliation(s)
- F Stockenhuber
- Department of Renal Disease and Dialysis, University of Vienna, Austria
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Hirschl M, Hirschl MM, Magometschnigg D, Liebisch B, Wagner O, Fux B, Kundi M. Arterial baroreflex sensitivity and blood pressure variabilities before and after carotid surgery. Klin Wochenschr 1991; 69:763-8. [PMID: 1762380 DOI: 10.1007/bf01797615] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Carotid surgery is frequently associated with postoperative blood pressure alterations. The role of baroreceptors with regard to these alterations was assessed in 50 patients by determining the pre- and postoperative mechanoreceptor sensitivity after Valsalva maneuver and intravenous injections of angiotensin and nitroglycerine as described by Smyth, Sleight and Pickering. In addition, blood pressure was monitored perioperatively and renin and aldosterone levels were measured. In patients with arterial hypertension a postoperative increase of receptor reactivity can be seen necessitating a reduction of antihypertensive therapy in more than 50% of cases. In normotensive patients no uniform response can be observed. A possible explanation for this effect might be the local increase of pressure in the operated vascular segment. The postoperative reintegration of receptor areas which had been adjusted to a reduced pressure level might induce a more sensitive response than can be seen for the remaining receptors, which usually are less responsive in hypertensive patients.
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Affiliation(s)
- M Hirschl
- Interne Gefässambulanz, Hanuschkrankenhaus Wien
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