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  • 1
    Digitale Medien
    Digitale Medien
    Serum from pregnant women carrying a fetus with neural tube defect is teratogenic for rat embryos in culture (1989)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 96 (1989), S. 0 
    Details
    ISSN: 1471-0528
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Summary. Sera from 13 pregnant women carrying a fetus with a neural tube defect, and from 13 control women with normal pregnancies at the same stage of gestation were used in the culture of postimplantation rat embryos. Serum from women with normal pregnancies had no adverse effect on rat embryo growth and development. Serum from 10 of the women with affected fetuses had a deleterious effect on the rat embryos as abnormalities of neural tube closure were observed in 28% of the conceptuses compared to only 1·3% of the embryos cultured in control scrum.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1471-0528.1989.tb01573.x
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  • 2
    Digitale Medien
    Digitale Medien
    On the mystery of the golden angle in phyllotaxis (2004)
    Oxford, UK : Blackwell Science Ltd
    Plant, cell & environment 27 (2004), S. 0 
    Details
    ISSN: 1365-3040
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Phyllotaxis, the arrangement of leaves around a stem, shows in the vast majority of cases a regularity in the divergence angle of subsequent leaves which divide the whole circle into regular fractions. These are in most cases rational fractions of two Fibonacci numbers in an alternating series, converging towards the irrational limit of the golden section, corresponding to the golden divergence angle of 137.5  . . . degrees. This peculiarity was a long-standing mystery. Here, it is related to the evolutionary pressure of optimal light capture for maximal photosynthetic activity. A model is established which relates minimal shadowing for the lower leaves to the divergence angle. Numerical results of this model agree well with semi-empirical data on the dependence of light capture from the divergence angle. The basic shadow function of the model is also related with the demand of minimal shadowing for the angular separation of leaves and obtain, using elementary number theory, as solution the golden section. Further numerical studies show that the rational approach to the golden section (Schimper–Braun series) is related to the leaf width and the number of leaves of the plant.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-3040.2004.01185.x
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  • 3
    Digitale Medien
    Digitale Medien
    Resolution of candidal lesions of the dorsal rat tongue by ketoconazole (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 17 (1988), S. 0 
    Details
    ISSN: 1600-0714
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: The purpose of this study was to determine whether the mucosal alterations of the dorsal rat tongue produced by Candida albicans infection were reversible upon treatment with the antifungal drug ketoconazole. Following experimentally-produced infection, 17 rats showed clinical evidence of persistent lesions over a period of 20 weeks. Eight of these animals were then treated with ketoconazole daily for 2 weeks (20 mg/kg/day). Appropriate non-infected controls and ketoconazole-only controls were also maintained. Five weeks after the ketoconazole treatment, all animals were killed and the dorsal tongues evaluated clinically and histologically. Control groups showed no abnormalities. Of the 8 animals in the treated-lesion group, all showed lesional resolution, while only 2 of the 9 animals in the untreated-lesion group showed resolution of their lesions (p=0.002). These findings indicate that the epithelial changes produced by this candidal isolate for this period of time are reversible.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1600-0714.1988.tb01517.x
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  • 4
    Digitale Medien
    Digitale Medien
    Prevalence of fluconazole-resistant strains of Candida albicans in otherwise healthy outpatients (2002)
    Oxford, UK : Blackwell Science, Ltd
    Journal of oral pathology & medicine 31 (2002), S. 0 
    Details
    ISSN: 1600-0714
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Background:  In contrast to the immunosupressed patient population, the prevalence of fluconazole-resistant strains of Candida albicans among healthy individuals has not been extensively studied.Methods:  Candida species were cultured form 50 healthy outpatients with clinical signs of oral candidiasis. Following one week of the recommended fluconazole regimen, post-treatment cultures were obtained. Both pre- and post-treatment yeasts were identified and in vitro susceptibility testing was performed using the NCCLS M-27A method. Strains were further differentiated using established cDNA probes.Results:  Forty-four patients (88%) had positive C.albicans cultures prior to treatment. Antifungal susceptibility testing of these strains demonstrated no in vitro resistance to fluconazole. At post-treatment evaluation, eight patients (18%) had persistent signs of infection and 10 patients (23%) had positive Candida sp. cultures despite no clinical signs of infection. DNA analysis confirmed that the same C. albicans strain was present both in the pre-treatment and the post-treatment cultures.Conclusions:  Our results showed that the presence of fluconazole-resistant strains of C.albicans does not appear to be prevalent among healthy outpatients furthermore, in vitro antifungal susceptibility testing does not always predict successful therapy in these patients.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1034/j.1600-0714.2002.310207.x
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  • 5
    Digitale Medien
    Digitale Medien
    Differences in mucosal reaction related to Candida albicans isolates (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 16 (1987), S. 0 
    Details
    ISSN: 1600-0714
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: In order to examine the behavior of Candida albicans in an oral mucosal model, 16 isolates of the organism were collected from a variety of clinical settings and were inoculated weekly, in equal numbers and concentrations, into the mouths of separate groups of 20 female Sprague-Dawley rats. Oral swabs were taken bi-weekly in order to monitor the presence of the yeast. After 16 weeks, the animals were killed and the tongues were examined grossly and histologically. Six isolates demonstrated the ability to produce characteristic dorsal tongue lesions to varying degrees (1/20; 1/20; 1/20; 2/20; 3/20; and 12/20). Of the remaining 10 isolates, 5 showed hyphal penetration of the keratin layer of the dorsal tongue epithelium, yet no mucosal reaction was elicited and no lesion was produced (1/19; 2/19; 4/20; 5/20 and 5/20). These findings support the concept that C. albicans exhibits a spectrum of mucosal pathogenicity for dorsal rat tongue.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1600-0714.1987.tb00693.x
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  • 6
    Digitale Medien
    Digitale Medien
    Electron microprobe analysis of proximal tubule cellular Na, Cl and K element concentrations during acute mannitol-saline volume expansion in rats: evidence for inhibition of the Na pump (1985)
    Springer
    Pflügers Archiv 403 (1985), S. 205-209 
    Details
    ISSN: 1432-2013
    Schlagwort(e): Electron microprobe analysis ; Volume expansion ; Intracellular electrolytes ; Renal tubular cells ; Natriuretic mechanisms
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract It has previously been shown that during mannitol-saline volume expansion (VE) Na transport was inhibited 50% by harvested proximal tubular fluid without a change in paracellular shunt pathway permeability to Na. To determine whether this inhibition was due to changes in cellular entry step or an effect on the pump itself, intracellular element concentrations were measured by electron microprobe X-ray ranalysis in proximal tubular cells of control (non-expanded, NE) and VE rats. Na i , Cl i and phosphorus i were increased (mean±S.E.) from 19.3±0.8 to 23.4±0.6, 15.8±0.4 to 21.3±0.4 and 124.3±2.6 to 138.0±1.8 mmol · kg−1 wet weight (P〈0.001) respectively while K i remained unchanged: 122.9±2.2 and 124.2±1.3 mmol · kg−1 wet weight. The increases in Na i and Cl i were in excess of cell shrinkage produced by the hyperosmolal peritubular environment while the unchanged K i in the face of cell shrinkage indicates and actual loss. It is concluded that mannitol-saline VE inhibits the Na pump producing a rise in Na i and a fall in K i .
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00584101
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  • 7
    Digitale Medien
    Digitale Medien
    Effect of acute metabolic acidosis on transmembrane electrolyte gradients in individual renal tubule cells (1988)
    Springer
    Pflügers Archiv 412 (1988), S. 427-433 
    Details
    ISSN: 1432-2013
    Schlagwort(e): Acute metabolic acidosis ; Renal distal electrolyte transport ; Renal cell electrolyte concentrations ; Individual distal tubule cells ; Transmembrane electrolyte concentration gradients ; Electron microprobe analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract We studied the effect of acute metabolic acidosis on potassium, sodium and chloride gradients across the apical membrane of proximal and distal tubule cells by determining electrolyte concentrations in individual cells and in tubule fluid employing electron microprobe analysis. Cellular measurements were performed on freeze-dried cryosections of the renal cortex, analysis of tubule fluid electrolyte concentrations on freeze-dried microdroplets of micropuncture samples obtained from proximal and from early and late distal collection sites. Acidosis (NH4Cl i.v. and i.g.) induced a substantial rise in plasma potassium concentration without significant effects on cell potassium concentrations. Potassium concentrations along the surface distal tubule were also unaltered; thus the chemical driving force for potassium exit from cell to lumen was not affected by acidosis. In all but intercalated cells acidosis markedly increased cell phosphorus concentration and cell dry weight indicating cell shrinkage and thus diminution of cell potassium content. Because the increase in intracellular chloride concentration exceeded the increase in plasma chloride concentration, the chemical chloride gradient across the contraluminal membrane was markedly depressed by acidosis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01907563
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  • 8
    Digitale Medien
    Digitale Medien
    Cellular osmoregulation in the renal papilla (1988)
    Springer
    Journal of molecular medicine 66 (1988), S. 843-848 
    Details
    ISSN: 1432-1440
    Schlagwort(e): Renal papillary cells ; Cell electrolytes ; Osmoadaptation ; Organic osmolytes ; Electron microprobe analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The cells of the renal papilla are subject to extreme variations in extracellular tonicity. To obtain more insight into the mechanisms whereby these cells adapt osmotically to these unique environmental conditions, elements were measured in individual cells of the rat renal papilla in antidiuresis and after prolonged furosemide administration. In antidiuresis cell sodium, chloride and potassium concentrations did not differ fundamentally from those observed in tubule cells exposed to isotonic surroundings such as in proximal tubule cells. The marked fall in extracellular electrolyte concentrations induced by furosemide was paralleled by a far less pronounced decline in intracellular sodium, chloride and potassium concentrations. These data indicate that papillary cells achieve osmoadaptation to widely differing extracellular tonicities mainly by varying the intracellular concentrations of osmotically active substances other than inorganic electrolytes. Since high concentrations of organic osmolytes (sorbitol, inositol, glycerophosphorylcholine and other trimethylamines) have been detected in the papilla and since the tissue contents of these compounds have been shown to vary in parallel with urine osmolality, it may be concluded that metabolically inert, organic osmolytes play a dominant role in the osmoregulation of renal papillary cells.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01728945
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  • 9
    Digitale Medien
    Digitale Medien
    Dosage – Response Curves for the Teratogenic Activity of Trypan Blue (1964)
    [s.l.] : Nature Publishing Group
    Nature 201 (1964), S. 1136-1137 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] At 8.5 days of gestation (timed by vaginal smearing), inbred Wista.r rats were injected subcutaneously with 5, 12.5, 25, 37.5, 50, 75, 100 or 200 mg/kg of trypan blue in the free acid form (control trypan blue (C)7). Controls received 5 ml/kg of isotonic saline. At 20.5 days the rats were killed, ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/2011136b0
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  • 10
    Digitale Medien
    Digitale Medien
    Effect of Trypan Blue on Rat Embryos (1960)
    [s.l.] : Nature Publishing Group
    Nature 187 (1960), S. 605-607 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] During our own preliminary investigations into the action of trypan blue it was found that the commercial sample used was grossly impure. A brief survey (Table 1) of the purity of various other commercial samples showed that the chief impurity was sodium chloride, which is used for the salting out ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/187605a0
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