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  • 1
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Using a biolistic device built here and based on the principle of the device described by Klein et al. (1987). we have reproducibly obtained transformants of Chlamydomonas reinhardtii. The reproducibility of the method has allowed us to examine the maintenance and expression of cloned DNA fragments introduced into C. Reinhardtii.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature America Inc.
    Nature biotechnology 18 (2000), S. 1172-1176 
    ISSN: 1546-1696
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: [Auszug] Removal of antibiotic resistance genes from genetically modified (GM) crops removes the risk of their transfer to the environment or gut microbes. Integration of foreign genes into plastid DNA enhances containment in crops that inherit their plastids maternally. Efficient plastid transformation ...
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Chromosoma 102 (1993), S. 500-507 
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We describe the characterization of tandemly repeated DNA sequences, which resemble the satellite DNA sequences of multicellular eucaryotes, in the unicellular green alga Chlamydomonas reinhardtii. Restriction enzymes that cleave C. reinhardtii DNA relatively frequently produce a number of high molecular weight DNA fragments in addition to the bulk of low molecular weight DNA fragments. pTANC 1.5 contains a 1.5 kb Sau3A fragment cloned from one of these large bands. pTANC 1.5 hybridized to at least three large arrays (200 to 700 kb) of tandemly repeated DNA sequences in the cell-wall-deficient strain cw1.5. These arrays are composed of repeat units that are each cleaved once by BamHl into bands of 1.5, 1.9, 2.0 and 2.5 kb in size. The copy numbers of the 1.5, 1.9, 2.0 and 2.5 kb Bamhl bands vary between different C. reinhardtii strains. Chlamydomonas smithii and a number of C. reinhardtii strains are deficient in all four BamHl bands. Genetic analysis of wild-type strain 137c, which is deficient in the 2.0 kb BamHl band, indicates that the 1.5, 1.9 and 2.5 kb BamHl bands derive from at least five loci. The 1.5, 1.9 and 2.5 kb repeat units are not extensively interspersed with each other in strain 137c. Pulsed-field gel electrophoresis of intact C. reinhardtii chromosomes indicates that TANC arrays are present on more than one chromosome.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0983
    Keywords: Chlamydomonas reinhardtii ; Repetitive DNA ; Transcription-organization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Four cDNAs (cDNAs 1–4),162,338,321 and 167 by in size, that contain repetitive DNA sequences, were isolated from C. reinhardtii. cDNAs 1, 2 and 3 hybridized to multiple transcripts in poly A+ RNA. Each of the four repeat families is comprised of an extremely heterogeneous population of interspersed nuclear DNA sequences most of which are less than 0.5 kbp in size. A large number of restriction fragment length polymorphisms were uncovered by using cDNAs 1 and 2 as hybridization probes. cDNA2 was compared to two different genomic DNA sequences: the first sequence was complementary to a central 136 bases of cDNA2, which is bordered by a 15-bp imperfect direct repeat; the second sequence lacks a poly-dA tail, but is otherwise colinear along its entire length with cDNA2. This suggests that some members of the cDNA2 repeat family contain signals for polyadenylation. The majority of accumulated transcripts that hybridize to cDNA2 have the same 5′–3′ orientation as cDNA2.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Current genetics 9 (1985), S. 671-678 
    ISSN: 1432-0983
    Keywords: Plastid DNA ; Barley ; Anther culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Wheat and barley albino plants derived from anther culture contain plastid genomes which have suffered deletion. DNA molecules of the size of unit genomes exist in these plants. In some cases these may be linear genomes. In all cases a region near the T8 fragment of barley or the corresponding region of the wheat plastid genome has been retained. This region may therefore represent sequences sufficient for replication.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Plant molecular biology 28 (1995), S. 437-442 
    ISSN: 1573-5028
    Keywords: Chlamydomonas ; transposon-like sequence ; nuclear genome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A 1.2 kb DNA sequence, flanked by a potential seven base target-site duplication, was found inserted into a TOC1 transposable element from Chlamydomonas reinhardtii. The insertion sequence, named TOC2, is a member of a family of repeated DNA sequences that is present in all the C. reinhardtii strains tested. It resembles class II transposable elements: it possesses short 14 bp imperfect terminal repeats that begin AGGAGGGT, and sub-terminal direct repeats located within 250 bp of the termini. No large open reading frames were found. The terminal bases and length of target-site duplication are important in classifying transposable elements. On this basis TOC2 does not fall readily into existing families of class II transposable elements found in plants.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1573-5036
    Keywords: chloroplast ; genetic engineering ; nif genes ; nitrogenase ; plant transformation ; plastid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The engineering of plants capable of fixing their own nitrogen is an extremely complex task, requiring the co-ordinated and regulated expression of 16 nif genes in an appropriate cellular location. We suggest that plastids may provide a favourable environment for nif gene expression provided that the nitrogenase enzyme can be protected from oxygen damage. Using the non-heterocystous cyanobacteria as a model, we argue that photosynthesis could be temporally separated from nitrogen fixation in chloroplasts by restricting nitrogenase synthesis to the dark period. We report preliminary data on the introduction and expression of one of nitrogenase components, the Fe protein, in transgenic tobacco and Chlamydomonas reinhardtii. Finally we discuss potential avenues for further research in this area and the prospects for achieving the ultimate goal of expressing active nitrogenase in cereal crops such as rice.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 237 (1993), S. 134-144 
    ISSN: 1617-4623
    Keywords: ADP/ATP translocator ; Chlamydomonas ; Codon usage ; Heat shock ; Mitochondria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The first AUG in the Chlamydomonas reinhardtii ADP/ATP translocator (CRANT) mRNA initiates an open reading frame (ORF) which is very similar (51–79% amino acid identity) to other ANT proteins. In contrast to higher plants, no evidence for a long amino-terminal extension was obtained. The 5′ non-transcribed region of the single-copy CRANT gene contains sequence motifs present in other C. reinhardtii nuclear genes. Four introns, whose positions are not conserved in other ANT genes, interrupt the protein coding region. A short heat shock specifically reduces CRANT mRNA levels. CRANT mRNA levels were unaffected by a mutation in photosynthesis. In a dark/light regime CRANT mRNA levels are high in the dark phase and low in the early light phase. Data on translation initiation sites, splice junctions and the codon preferences of C. reinhardtii nuclear genes were compiled. With the exception of two rare codons, ACA and GGA, the CRANT gene exhibits the biased codon usage of C. reinhardtii nuclear genes that are highly expressed during normal vegetative growth.
    Type of Medium: Electronic Resource
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