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  • 1
    Digitale Medien
    Digitale Medien
    Effects of a single dose of the acetylcholinesterase inhibitor velnacrine on recognition memory and regional cerebral blood flow in Alzheimer's disease (1992)
    Springer
    Psychopharmacology 108 (1992), S. 103-109 
    Details
    ISSN: 1432-2072
    Schlagwort(e): Dementia ; Alzheimer's disease ; Acetylcholinesterase-inhibitor ; Tomography, single photon emission computed ; Human
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The effects of a single oral dose of the acetylcholinesterase inhibitor velnacrine maleate on word and object recognition memory and regional uptake of99mTc-exametazime were examined in patients with Alzheimer's disease. Word recognition memory was marginally improved 2 h after 75 mg velnacrine. With the same dose of velnacrine a relative increase in superior frontal uptake of99mTc-exametazime was shown with single photon emission computed tomography (SPECT). This suggests increased regional perfusion and metabolism as a consequence of cholinergic stimulation. The effect did not co-vary with the degree of memory improvement, but, instead, more cognitively impaired patients showed a greater increase in tracer uptake after velnacrine, suggesting cholinergic hypersensitivity in the brains of Alzheimer patients.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02245293
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  • 2
    Digitale Medien
    Digitale Medien
    Somatic hybridization between Lycopersicon esculentum and Lycopersicon pennellii (1985)
    Springer
    Theoretical and applied genetics 70 (1985), S. 1-12 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Tomato ; Somatic hybrid ; Protoplast fusion ; Organelle genome ; Regeneration
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Selection and screening methods were devised which resulted in the identification of a number of somatic hybrid callus clones following fusion of Lycopersicon esculentum protoplasts and L. pennellii suspension culture protoplasts. Visual selection for callus morphology combined with a high fusion frequency and irradiation of one parental protoplast type (137Cs source, 1.5 Krads) resulted in selection of a callus clone population containing a high proportion of somatic hybrids. Analysis of a dimeric isozyme for the presence of a heterodimeric form was found to be satisfactory for distinguishing parental-type calli, somatic hybrid calli, and mixed calli derived from both types of unfused parental cells. No somatic hybrid calli produced shoots, although the sexual hybrid between L. esculentum and L. pennellii regenerated well under the culture conditions employed. This result suggests that the non-regenerable growth habit of the L. pennellii suspension culture was dominant in the somatic hybrid. The culture conditions described here are suitable for obtaining regenerated plants from L. esculentum mesophyll protoplasts. L. esculentum protoplast calli from fusion cultures gave rise to shoots with L. esculentum phenotype at higher frequency than calli from control unfused L. esculentum mesophyll protoplast cultures. The use of probes for species-specific organelle DNA fragments allowed identification of organelle DNA restriction fragments in digests of total DNA from small samples of individual callus clones. The callus clones analyzed either carried predominantly one parental plastid DNA type or mixtures of both types. Use of a mitochondrial DNA (mtDNA) probe which distinguishes two parental mtDNA fragments revealed that the L. pennellii-specific fragment was present in all clones examined, but the L. esculentum fragment was absent or in low proportion.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00264476
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  • 3
    Digitale Medien
    Digitale Medien
    Regeneration of somatic hybrid plants formed between Lycopersicon esculentum and Solatium rickii (1986)
    Springer
    Theoretical and applied genetics 72 (1986), S. 59-65 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Tomato ; Somatic hybrid ; Organelle genome ; Regeneration ; Protoplast fusion
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary A single somatic hybrid callus clone was identified following the fusion of Lycopersicon esculentum protoplasts and Solanum rickii suspension culture protoplasts. The hybrid nature of the callus and the plants regenerating from it was determined by assaying phosphoglucomutase-2 isozyme expression. The chloroplast genome present in four somatic hybrid plants was characterized by probing digests of total DNA with nick translated L. esculentum chloroplast DNA(cpDNA). All four somatic hybrid plants had inherited S. rickii cpDNA. Two clones of plant mitochondrial DNA (mtDNA), soybean 18S and 5S rDNA and maize cytochrome oxidase subunit II were used to characterize the mtDNA present in total DNA digests of four somatic hybrid plants. In both cases, the somatic hybrid plants had inherited most but not all of the S. rickii specific fragments, but none of the L. esculentum specific fragments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00261455
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  • 4
    Digitale Medien
    Digitale Medien
    Differential fate of plastid and mitochondrial genomes in Petunia somatic hybrids (1986)
    Springer
    Theoretical and applied genetics 72 (1986), S. 748-755 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Petunia ; Chloroplast DNA ; Mitochondrial DNA ; Somatic hybrid ; Protoplast fusion
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The chloroplast (cp) and mitochondrial (mt) DNAs of Petunia somatic hybrid plants, which were derived from the fusion of wild-type P. parodii protoplasts with albino P. inflata protoplasts, were analyzed by endonuclease restriction and Southern blot hybridization. Using 32P-labelled probes that distinguished the two parental cpDNAs at a BamH1 site and at a HpaII site, only the P. parodii chloroplast genome was detected in the 10 somatic hybrid plants analyzed. To examine whether cytoplasmic mixing had resulted in rearrangement of the mitochondrial genome in the somatic hybrids, restriction patterns of purified somatic hybrid and parental mtDNAs were analyzed. Approximately 87% of those restriction fragments which distinguish the two parental genomes are P. inflata-specific. Restriction patterns of the somatic hybrid mtDNAs differ both from the parental patterns and from each other, suggesting that an interaction occurred between the parental mitochondrial genomes in the somatic fusion products which resulted in generation of the novel mtDNA patterns. Southern blot hybridization substantiates this conclusion. In addition, somatic hybrid lines derived from the same fusion product were observed to differ in mtDNA restriction pattern, reflecting a differential sorting-out of mitochondrial genomes at the time the plants were regenerated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00266540
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  • 5
    Digitale Medien
    Digitale Medien
    Regeneration of somatic hybrid plants formed between Lycopersicon esculentum and L. pennellii (1987)
    Springer
    Theoretical and applied genetics 75 (1987), S. 83-89 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Tomato ; Somatic hybrid ; Organelle genome ; Protoplast fusion ; Irradiation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Somatic hybrid plants have been regenerated following polyethylene glycol mediated fusion of leaf mesophyll protoplasts from tomato and protoplasts from Lycopersicon pennellii callus. Three different cultivars of tomato were used as sources of protoplasts: Early Girl, Manapal, and UC82B. Fusions were performed between protoplasts of these tomato cultivars and protoplasts of L. pennellii, and between protoplasts of the cultivars and protoplasts of L. pennellii that had been exposed to 3 or 6 krads of gamma radiation. Somatic hybrid plants were identified on the basis of heterozygous isozyme banding patterns, and leaf and flower morphology. Somatic hybrid plants were regenerated following fusion of tomato protoplasts with either untreated or irradiated L. pennellii protoplasts. All were heterozygous for isozyme loci on five different chromosomes. Regenerated somatic hybrids showed inheritance of either or both parental chloroplast genomes, but predominantly the L. pennellii mitochondrial genome. The regenerated somatic hybrid plants exhibited reduced fertility, less than 20% viable pollen. A total of 34 somatic hybrid calli were identified. Of these, 21 regenerated shoots, and 7 produced seed following manual pollinations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00249146
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