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  • Salmon  (2)
  • AFLP  (1)
  • Biochemistry  (1)
  • 1
    ISSN: 1432-2242
    Schlagwort(e): Key words QTL ; AFLP ; Marker-assisted selection ; Barley ; Puccinia striiformis f.sp. hordei
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract  Genome-analysis tools are useful for dissecting complex phenotypes and manipulating determinants of these phenotypes in breeding programs. Quantitative trait locus (QTL)-analysis tools were used to map QTLs conferring adult plant resistance to stripe rust (caused by Puccinia striiformis f.sp. hordei) in barley. The resistance QTLs were introgressed into a genetic background unrelated to the mapping population with one cycle of marker-assisted backcrossing. Doubled-haploid lines were derived from selected backcross lines, phenotyped for stripe-rust resistance, and genotyped with an array of molecular markers. The resistance QTLs that were introgressed were significant determinants of resistance in the new genetic background. Additional resistance QTLs were also detected. The susceptible parent contributed resistance alleles at two of these new QTLs. We hypothesize that favorable alleles were fixed at these new QTLs in the original mapping population. Genetic background may, therefore, have an important role in QTL-transfer experiments. A breeding system is described that integrates single-copy and multiplex markers with confirmation of the target phenotype in doubled-haploid lines phenotyped in field tests. This approach may be useful for simultaneously producing agronomically useful germplasm and contributing to an understanding of quantitatively inherited traits.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Archives of toxicology 69 (1995), S. 379-383 
    ISSN: 1432-0738
    Schlagwort(e): Keywords Cyclohexylmethylphosphonofluoridate ; Rhesus monkey ; Serum ; Biochemistry ; Hemotology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  Changes in serum biochemical and hematological parameters were studied in 20 male rhesus monkeys following acute poisoning by the organophosphate nerve agent cyclohexylmethylphosphonofluoridate (CMPF or GF). Animals were challenged with 5×LD50 GF (233 μg/kg, IM) following pretreatment with pyridostigmine (0.3–0.7 mg/kg per 24 h) and treated with atropine (0.4 mg/kg, IM) and either 2-PAM (25.7 mg/kg, IM) or HI6 (37.8 mg/kg, IM) at the onset of clinical signs or at 1 min after exposure. Muscle fasciculations, tremors, or convulsions occurred in 19 of 20 animals. Serum biochemical and hematologic parameters were analyzed 2 days and 7 days after exposure and compared to pre-exposure baseline values. Significant increases in creatine kinase (CK), lactate dehydrogenase (LD), aspartate transaminase (AST), alanine transaminase (ALT) and potassium ion (K+), associated with damage to striated muscle and metabolic acidosis, occurred in both oxime-treated groups 2 days after exposure. Total protein, albumin, red blood cell (RBC) count, hemoglobin concentration (Hb) and hematocrit (Hct), were decreased in both oxime-treated groups at 7 days. The results demonstrate that animals exposed to a single high dose of GF and treated with standard therapy exhibit changes in serum biochemical and hematological indices directly and indirectly associated with their clinical presentations.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Journal of comparative physiology 167 (1997), S. 370-377 
    ISSN: 1432-136X
    Schlagwort(e): Key words Proximal and distal intestine ; Mannitol flux ; Transepithelial electrical resistance ; Enhancement ; Salmon
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract The objective of this study was to assess regional variations in the permeability of the salmon posterior intestine and to evaluate the effect of permeability enhancers as a basis for oral delivery of biologically active peptides. Proximal and distal portions of the posterior intestine of the chinook salmon (Oncorhynchus tshawytscha) were removed, mounted as flat sheets in Ussing chambers and superfused with trout Ringer's. Intestinal permeability was assessed under short-circuit conditions by measurement of 14C-mannitol (mucosal to serosal) flux. Tissues were treated either with the mucolytic agent dithiothreitol (10 mmol · l−1), the permeability enhancer sodium deoxycholate (5.0 mmol · l−1) or both and compared to untreated controls. Both proximal and distal control tissues had low permeabilities, but the distal region had a lower transepithelial electrical resistance and produced significantly less mucus. Treatment with either dithiothreitol or sodium deoxycholate alone reduced mucus adhering to tissue in both regions but did not increase permeability or change transepithelial electrical resistance. In the distal region, sequential treatment with both agents significantly reduced adhering mucus, decreased transepithelial electrical resistance, and increased tissue permeability. The salmon posterior intestine can be divided into proximal and distal regions. The distal region is more likely to have the necessary permeability and responsiveness to enhancement for the successful delivery of peptides or polar drugs.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Journal of comparative physiology 168 (1998), S. 562-568 
    ISSN: 1432-136X
    Schlagwort(e): Key words Mannitol ; Fluorescein ; Permeability ; Salmon ; Posterior intestine ; Enhanced epithelial permeability
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract This study characterised the permeability of the salmonid posterior intestine in vivo, to two hydrophilic markers of different molecular weight, both in the presence and absence of sodium deoxycholate (SDA), and determined the influence of mucosal secretions. The posterior intestine of chinook salmon was cannulated with a balloon catheter and the lumen infused with a solution of fluorescein and 14C-mannitol. In treated fish, the solution also contained 5.0 mmol · l−1 SDA. Blood samples from the dorsal aorta were taken at regular time intervals over 3 h. Clearances and volumes of distribution were assessed by intravenous administration of the markers to another group of fish. In the absence of SDA, low permeabilities were recorded for both markers; however, permeabilities for both were significantly greater in the treated groups. Both solutes had volumes of distribution similar to values reported elsewhere. Metabolism of fluorescein by the liver resulted in its plasma clearance. In contrast, elimination of mannitol was negligible during the study period, probably due to the lowered glomerular filtration rates observed in sea water adapted fish. Compared to in vitro investigations, in vivo mucus secretions were significantly lower and solute delivery across the epithelium was higher. Results from these in vivo investigations have implications for the oral delivery of peptides to salmonids.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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