ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

Digitale Medien

Electrophoretic Characterization of Members of the Crypthecodinium cohnii (Dinophyceae) Species Complex (1987)

BEAM, CARL A. ; HIMES, MARION

Oxford, UK : Blackwell Publishing Ltd

The @journal of eukaryotic microbiology 34 (1987), S. 0

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1550-7408

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Biologie

Notizen: Eighty-seven axenic clones of the colorless inshore dinoflagellate Crypthecodinium cohnii were found by mating experiments to fall into 52 sibling species, seven wide ranging (two possibly global)—called major sibling species—and 45 found only once—minor sibling species. Electrophoretic analysis of three soluble enzymes from these strains revealed the following: 1) Despite some polymorphism most members of major sibling species closely resemble one another electrophoretically. 2) Major sibling species and most minor ones are electrophoretically distinct. 3) Sharing of electromorphs is sufficiently extensive, however, that no major sibling species is totally unrelated to all others. 4) Some minor sibling species are electrophoretically indistinguishable from a member of a major sibling species or from one another, suggesting recent origin by sexual isolation in situ. 5) Other minor sibling species differ from majors by one, two, or all three of the enzymes studied. A “model” of sexual isolation and diversification is offered.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1550-7408.1987.tb03161.x

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

2

Digitale Medien

Distribution of Members of the Crypthecodinium cohnii (Dinophyceae) Species Complex (1982)

BEAM, CARL A. ; HIMES, MARION

Oxford, UK : Blackwell Publishing Ltd

The @journal of eukaryotic microbiology 29 (1982), S. 0

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1550-7408

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Biologie

Notizen: Crypthecodinium cohnii, a small marine heterotrophic homothallic dinoflagellate, has diversified into a complex of morphologically very similar breeding groups (biological species or sibling species), some of which have become widely dispersed. Membership of two clones in the same sibling species is shown by their sexual compatibility as determined by genetic complementation in zygotes formed from motility mutants derived from the two stocks. Membership in different sibling species may be inferrec when motility mutants of one strain do not complement those of another. Fifty-six clones representing seaweed enrichments from *** geographic sites have been found to belong to 28 sibling species; 35 clones are members of seven wide-ranging biological species, and 21 are single representatives of 21 other breeding groups within the ranges of the others. Of 174 clonal isolates in our possession, 168 conform in size and shape to C. cohnii. Six others which have smaller cells and only one-fifth the standard DNA and chromosome number belong, we believe, to another species. The C. cohnii complex provides a unique opportunity for the study of evolutionary divergence and geographical dispersion of a dinoflagellate.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1550-7408.1982.tb02874.x

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

3

Digitale Medien

Further Studies of Breeding Restrictions among Crypthecodinium cohnii-like Dinoflagellates. Evidence of a New Interbreeding Group (1978)

HIMES, MARION ; BEAM, CARL A.

Oxford, UK : Blackwell Publishing Ltd

The @journal of eukaryotic microbiology 25 (1978), S. 0

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1550-7408

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Biologie

Notizen: SYNOPSIS. Studies on sexual compatibility among populations of different origins of axenically cultivated, heterotrophic, homothallic dinoflagellates resembling Crypthecodinium cohnii have been undertaken using motility mutants and complementation testing. We showed previously that one interbreeding group or biologic species can be found on the East and West coasts of the United States, thus far associated only with Fucus. In addition, we found several strains of these organisms each of which, though fertile in intrastrain crosses, appeared infertile with all other isolates. A continuation of these studies has revealed another biologic species of wide geographic distribution (Taiwan, California, Florida, New York) and apparently associated with sea weeds other than Fucus.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1550-7408.1978.tb03908.x

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

4

Digitale Medien

Ribosomal RNA Sequencing of Members of the Crypthecodinium cohnii (Dinophyceae) Species Complex; Comparison with Soluble Enzyme Studies (1993)

BEAM, CARL A. ; PREPARATA, ROSA-MARIA ; HIMES, MARION ; [weitere]

Oxford, UK : Blackwell Publishing Ltd

The @journal of eukaryotic microbiology 40 (1993), S. 0

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1550-7408

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Biologie

Notizen: . Sixty-five members of the Ctypthecodinium cohnii species complex were analyzed for sequence differences within the D2 region of the 23S ribosomal RNA molecule. On the basis of 46 sequence differences the strains fell into 19 distinct ribosets (strains of identical sequence), some with many members. Members of four of the seven major sibling species (widespread breeding groups) were each found within single ribosets. Members of three other major sibling species were each, however, divided into two ribosets by a single sequence difference correlated with geographic separation and with previously reported electrophoretic polymorphisms of soluble enzymes within the sibling species. In addition to members of major sibling species, some ribosets include many minor sibling species (each represented by only one strain). Of 38 minor sibling species, 22 shared sequence with a major sibling species. Of these 22, 14 were identical in soluble enzymes to their related major sibling species or differed by only one of three enzymes. Other minor sibling species appear to have diverged extensively from any others in both rRNA sequence and electrophoretic profile. As a group, major sibling species differ markedly in the number of minor sibling species associated with them, suggesting differences in frequency of sexually isolating events in their past histories. These findings are discussed in the context of the previously proposed model of sympatric speciation.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1550-7408.1993.tb06124.x

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

5

Digitale Medien

Sexual Isolation and Genetic Diversification Among Some Strains of Crypthecodinium cohnii-like Dinoflagellates Evidence of Speciation (1977)

BEAM, CARL A. ; HIMES, MARION

Oxford, UK : Blackwell Publishing Ltd

The @journal of eukaryotic microbiology 24 (1977), S. 0

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1550-7408

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Biologie

Notizen: SYNOPSIS. Nine new isolates of Crypthecodinium-like dinoflagellates from diverse geographic locations, together with 3 established strains from Woods Hole and Puerto Rico, were analyzed for sexual compatibility by means of a complementation test using motility mutants. The results indicate that 5 of the 12 are mutually compatible and thereby represent one species. Five others are clearly reproductively isolated from this group and from each other and therefore may belong to separate species. The position of 2 other isolates remains uncertain. Only one, MC-5, is markedly distinct morphologically from all the others. It is also sympatric with one of the others, strain G, and its separation from Crypthecodinium cohnii seems therefore more fully justified than that of the other sexually isolated strains. G and MC-5 would be considered “good” species by an evolutionary biologist. The others are from widely separate geographic origins and. though still poorly characterized, all superficially resemble C. cohnii. Comparison of many characters (DNA profile, radiation response, drug sensitivity, macroalgal association, etc.) of the incompatible strains show significant disparities which are discussed in considering speciation.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1550-7408.1977.tb01007.x

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

6

Digitale Medien

Nuclear Proteins of Hepatocyte and Erythrocyte Nuclei of Frog Liver (1969)

BURDICK, CAROLYN J. ; HIMES, MARION

[s.l.] : Nature Publishing Group

Nature 221 (1969), S. 1150-1152

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] We have attempted to obtain further information about the role of nuclear proteins in the regulation of gene activity by characterizing and comparing the nuclear proteins of genetically active (hepatocyte) nuclei and relatively inactive (erythrocyte) nuclei by both biochemical and cytochemical ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/2211150a0

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

7

Digitale Medien

Evidence for sexual fusion and recombination in the dinoflagellate Crypthecodinium (Gyrodinium) cohnii (1974)

BEAM, CARL A. ; HIMES, MARION

[s.l.] : Nature Publishing Group

Nature 250 (1974), S. 435-436

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] Axenic cultures of Puerto Rican and Woods Hole strains of C. cohnii (gifts from Drs K. Gold and L. Provasoli, respectively) and a strain which we isolated from Mattapoisett Bay, Massachusetts, were cloned by isolating single cells on agar by micromanipulation. Several clones of each strain were ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/250435a0

Permalink