WorldCat Identities

Hellgren, Olof

Overview
Works: 19 works in 25 publications in 3 languages and 29 library holdings
Roles: Author, Publishing director, Other
Publication Timeline
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Most widely held works by Olof Hellgren
Aus den Memoiren eines Laubfrosches by Olof Hellgren( Book )

5 editions published in 1896 in German and held by 6 WorldCat member libraries worldwide

Data base for birch plants at steady-state : performance of birch plants (Betula pendula Roth.) under non-limiting conditions and under limitation by nitrogen and light by Torsten Ingestad( Book )

2 editions published in 1994 in English and held by 3 WorldCat member libraries worldwide

Data base for birch plants at steady-state : performance of birch plants (Betula pendula Roth.) under non-limiting conditions and under limitation by nitrogen and light by Torsten Ingestad( Book )

1 edition published in 1994 in English and held by 2 WorldCat member libraries worldwide

Djurens värn : tidskrift( )

in Swedish and held by 2 WorldCat member libraries worldwide

A parasite perspective of malaria vectors : obstacles, life history trade-offs and manipulations by Olof Hellgren( Book )

1 edition published in 2004 in English and held by 1 WorldCat member library worldwide

J.F. Lundin och hans ugnskonstruktioner by Olof Hellgren( )

1 edition published in 1946 in Swedish and held by 1 WorldCat member library worldwide

Datorer för växthusbruk by Olof Hellgren( Book )

1 edition published in 1980 in Swedish and held by 1 WorldCat member library worldwide

Evolution of a cluster of innate immune genes(beta-defensins) along the ancestral lines of chicken and zebra finch by Olof Hellgren( )

1 edition published in 2010 in English and held by 1 WorldCat member library worldwide

BACKGROUND:Avian beta-defensins (AvBDs) represent a group of innate immune genes with broad antimicrobial activity. Within the chicken genome, previous work identified 14 AvBDs in a cluster on chromosome three. The release of a second bird genome, the zebra finch, allows us to study the comparative evolutionary history of these gene clusters between from two species that shared a common ancestor about 100 million years ago. RESULTS:A phylogenetic analysis of the beta-defensin gene clusters in the chicken and the zebra finch identified several cases of gene duplication and gene loss along their ancestral lines. In the zebra finch genome a cluster of 22 AvBD genes were identified, all located within 125Kbp on chromosome three. Ten of the 22 genes were found to be highly conserved with orthologous genes in the chicken genome. The remaining 12 genes were all located within a cluster of 58 Kbp and are suggested to be a result of recent gene duplication events that occurred after the galliformes- passeriformes split (G-P split) and where no duplications have happened along the chicken line. Within the chicken genome, AvBD6 was found to be a duplication of AvBD7, whereas the gene AvDB14 seems to have been lost along the ancestral line of the zebra finch. The duplicated beta-defensin genes have had a significantly higher accumulation of non-synonymous over synonymous substitutions compared to the genes that have not undergone duplication since the G-P split. The expression patterns of avian beta-defensin genes seem to be well conserved between chicken and zebra finch.CONCLUSION:The genomic comparisons of the beta-defensins gene clusters of the chicken and zebra finch illuminate the evolutionary history of this gene complex. Along their ancestral lines, several gene duplication events have occurred in the passerine line after the galliformes-passeriformes split giving rise to 12 novel genes compared to a single duplication event in the galliformes line. After the duplication events, the duplicated genes have been subject to a relaxed selection pressure compared to the non-duplicated genes, thus supporting models of evolution by gene duplication
Filmen i kommunens tjänst by Olof Hellgren( )

1 edition published in 1935 in Swedish and held by 1 WorldCat member library worldwide

Huddinge socken by Margareta Seth-Stenung( Book )

1 edition published in 1958 in Swedish and held by 1 WorldCat member library worldwide

Avian malaria in the montane tropics by Benjamin Daly( )

1 edition published in 2013 in English and held by 1 WorldCat member library worldwide

J. F. Lundin och hans ugnskonstruktioner by Olof Hellgren( )

1 edition published in 1946 in Swedish and held by 1 WorldCat member library worldwide

Data base for tomato plants at steady plants (Lycopersicon esculentum Mill cv. Solentos) under non-limiting conditions and under limitation by nitrogen and light by Torsten Ingestad( Book )

1 edition published in 1994 in English and held by 1 WorldCat member library worldwide

Filmförevisningar i hembygdsföreningarna by Olof Hellgren( )

1 edition published in 1936 in Swedish and held by 1 WorldCat member library worldwide

Arbetsbok i hembygdskunskap : Utarb by Margareta Seth-Stenung( Book )

1 edition published in 1953 in Swedish and held by 1 WorldCat member library worldwide

Huddinge socken : Arbetsbok i hembygdskunskap by Margareta Seth-Stenung( Book )

1 edition published in 1953 in Swedish and held by 1 WorldCat member library worldwide

 
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Audience Level
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Audience level: 0.90 (from 0.59 for Data base ... to 0.97 for Djurens va ...)

Languages
Swedish (10)

English (10)

German (5)