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Digitale Medien

Transfer of a marine DNA virus fromEctocarpus toFeldmannia (Ectocarpales, Phaeophyceae): aberrant symptoms and restitution of the host (1993)

Müller, D. G. ; Parodi, Elisa

Springer

Protoplasma 175 (1993), S. 121-125

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ISSN: 1615-6102

Schlagwort(e): Ectocarpus ; Feldmannia ; Phaeophyceae ; DNA-virus, marine ; Intergeneric gene transfer

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Summary The marine brown algaEctocarpus siliculosus is invaded by a polyhedric virus, whose genome consists of circular, double-stranded DNA. In laboratory experiments this virus can infect a different host species,Feldmannia simplex. InfectedFeldmannia plants show severe somatic malformations. However, no functional virus particles are formed. SuchFeldmannia plants recover to resume a normal, symptom-free appearance. This result raises the possibility of intergeneric gene transfer in the natural habitat.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01385009

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Digitale Medien

Two-loop relevant parts ofD-dimensional massive scalar one-loop integrals (1993)

Nierste, U. ; Müller, D. ; Böhm, M.

Springer

The European physical journal 57 (1993), S. 605-613

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ISSN: 1434-6052

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The calculation of two-loop Feynman integrals within the dimensional regularization scheme requires the knowledge of scalar one-loop integrals up to the linear term inD-4. We give the corresponding explicit expressions in terms of polylogarithms for the general one-, two-and three-point function and for a special case of the fourpoint function needed for vertex corrections. Our results are valid in all kinematical regions for real masses and momenta.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01561479

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Digitale Medien

Virus infections in three marine brown algae: Feldmannia irregularis, F. simplex, and Ectocarpus siliculosus (1993)

Müller, D. G. ; Frenzer, K.

Springer

Hydrobiologia 260-261 (1993), S. 37-44

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ISSN: 1573-5117

Schlagwort(e): Virus infection ; marine ; Phaeophyceae ; Feldmannia ; Ectocarpus

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract Culture studies with healthy and virus-infected isolates of Ectocarpus siliculosus, Feldmannia simplex and F. irregularis gave the following results: Virus particles are produced in deformed reproductive organs (sporangia or gametangia) of the hosts and are released into the surrounding seawater. Their infective potential is lost after several days of storage under laboratory conditions. New infections occur when gametes or spores of the host get in contact with virus particles. The virus genome enters all cells of the developing new plant via mitosis. Virus expression is variable, and in many cases the viability of the host is not impaired. Infected host plants may be partly fertile and pass the infection to their daughter plants. Meiosis of the host can eliminate the virus genome and generate healthy progeny. The genome of the Ectocarpus virus consists of dsDNA. Meiotic segregation patterns suggest an intimate association between virus genome and host chromosomes. An extra-generic host range has been demonstrated for the Ectocarpus virus. Field observations suggest that virus infections in ectocarpalean algae occur on all coasts of the world, and many or all Ectocarpus and Feldmannia populations are subject to contact with virus genomes.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00049001

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Digitale Medien

Deep-water macroalgae from the Canary Islands: new records and biogeographical relationships (1993)

Haroun, R. J. ; Prud'homme van Reine, W. F. ; Müller, D. G. ; [weitere]

Springer

Helgoland marine research 47 (1993), S. 125-143

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ISSN: 1438-3888

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract Due to the geographical location and paleobiogeography of the Canary Islands, the seaweed flora contains macroalgae with different distributional patterns. In this contribution, the biogeographical relations of several new records of deep-water macroalgae recently collected around the Canarian archipelago are discussed. These areBryopsidella neglecta (Berthold) Rietema,Discosporangium mesarthrocarpum (Meneghini) Hauck,Hincksia onslowensis (Amsler et Kapraun) P. C. Silva,Syringoderma floridana Henry,Peyssonnelia harveyana J. Agardh,Cryptonemia seminervis (C. Agardh) J. Agardh,Botryocladia wynnei Ballantine,Gloiocladia blomquistii (Searles) R. E. Norris,Halichrysis peltata (W. R. Taylor) P. Huvé et H. Huvé,Leptofauchea brasiliensis Joly, andSarcodiotheca divaricata W. R. Taylor. These new records, especially those in the Florideophyceae, support the strong affinity of the Canary Islands seaweed flora with the warm-temperate Mediterranean-Atlantic region. Some species are recorded for the first time from the east coast of the Atlantic Ocean, enhancing the biogeographic relations of the Canarian marine flora with that of the western Atlantic regions.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02430354

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