• KOL
    • Cytokinin Activity
    • Folke Skoog
    • Folke Skoog: Influence Statistics

      Folke Skoog

      Folke Skoog

      Department of Botany, Birge Hall, University of Wisconsin, Madison, Wisconsin 53706 | Institute of Plant Development, Birge Hall, University of Wisconsin, Madison, Wisconsin ...

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      Folke Skoog:Expert Impact

      Concepts for whichFolke Skooghas direct influence:Cytokinin activity,Trna species,Wheat germ,Tobacco callus,Biological activity,Tobacco bioassay,Cytokinin activities,Microcystis aeruginosa.

      Folke Skoog:KOL impact

      Concepts related to the work of other authors for whichfor which Folke Skoog has influence:Somatic embryogenesis,Plant regeneration,Arabidopsis thaliana,Gene expression,Tissue culture,Vitro propagation,Hairy roots.

      KOL Resume for Folke Skoog

      Year
      1987

      Department of Botany, Birge Hall, University of Wisconsin, Madison, Wisconsin 53706

      1980

      Institute of Plant Development, Birge Hall, University of Wisconsin, Madison, Wisconsin 53706

      1979

      Institute of Plant Development, Department of Botany, University of Wisconsin, Madison, Wisconsin 53706

      1977

      Institute of Plant Development University of Wisconsin Madison, Wisconsin 53706 USA

      1976

      aInstitute of Plant Development, University of Wisconsin, Madison, Wisconsin 53706

      1975

      Institute of Plant Development, Birge Hall, University of Wisconsin, Madison, Wisconsin 53706, U.S.A.

      1974

      Institute of Plant Development, University of Wisconsin, Madison, Wisconsin 53706

      1973

      Institute of Plant Development, Birge Hall, University of Wisconsin, Madison Wisc. 53706

      1972

      Institute of Plant Development, Birge Hall, University of Wisconsin, Madison, Wiscosin 53706

      1970

      Institute of Plant Development, University of Wisconsin, Madison, Wisconsin 53706, U.S.A.

      INSTITUTE OF PLANT DEVELOPMENT, BIRGE HALL, UNIVERSITY OF WISCONSIN, MADISON, WIS. 53706

      1969

      Department of Botany, University of Wisconsin, Madison, Wisconsin 53706

      INSTITUTE OF PLANT DEVELOPMENT, UNIVERSITY OF WISCONSIN, MADISON DEPARTMENT OF MOLECULAR BIOPHYSICS, YALE UNIVERSITY, NEW HAVEN

      Institute of Plant Development, University of Wisconsin, Madison, Wisconsin, USA

      1968

      Institute of Plant Development, University of Wisconsin, Madison, Wisconsin

      1967

      Department of Botany, University of Wisconsin, Madison, Wisconsin 53706 U.S.A.

      1966

      Department of Botany, University of Wisconsin, Madison, Wisconsin

      1962

      Department of Botany, University of Wisconsin, Madison, 6, Wisconsin

      1961

      Department of Botany University of Wisconsin Madison 6, Wisconsin

      1960

      Department of Botany, University of Wisconsin. Madison, Wisconsin

      1959

      DEPARTMENT OF BOTANY, UNIVERSITY OF WISCONSIN, MADISON 6, WISCONSIN

      Departments of Botany, Bacteriology University of Wisconsin, Madison 6, Wisconsin

      Department of Botany, University of Delhi, Delhi 8, India

      1957

      Departments of Pathology and Botany, University of Wisconsin

      1956

      Departments of Botany and Pathology. University of Wisconsin

      1955

      U. S. Regional Soybean Laboratory, Urbana, Illinois

      1954

      Department of Botany, University of Wisconsin

      1952

      Department of Botany, College of Letters and Science

      1951

      The University of Wisconsin Press, Madison

      1950

      Department of Botany University of Wisconsin

      1944

      Biological Laboratories, Johns Hopkins University, Baltimore, Maryland

      1942

      Stellenbosch, Union of South Africa

      Harvard University, Cambridge, Massachusetts

      Johns Hopkins University, Baltimore, Maryland

      1938

      Division of Plant Nutrition, University of California, Berkeley, Calif.

      1937

      From the William G. Kerckhoff Laboratories of the Biological Sciences, California Institute of Technology, Pasadena

      1935

      The William G. Kerckhoff Laboratories of the Biological Sciences, California Institute of Technology, Pasadena

      1934

      William G. Kerckhoff Laboratories of the Biological Sciences, California Institute of Technology.

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      Sample of concepts for which Folke Skoog is among the top experts in the world.
      Concept World rank
      considerable dna #1
      callus transfer #1
      814cfr6a content #1
      presence alternate form #1
      thiamine tissue #1
      3 position adenine #1
      bacterial rna layer #1
      white nutrient #1
      trna extraction #1
      cytokinins influence #1
      synthesis coleoptile #1
      unsubstituted couterparts #1
      week tissue transfer #1
      derivatives ribosides #1
      cytokinins chloroplast #1
      dowex 50 columns #1
      conjunction cytokinin concentrations #1
      lh20 ribosylzeatin #1
      natural components trna #1
      ribosylciszeatin #1
      azidopurines cytokinin activity #1
      rrna preparation #1
      wheat germ structure #1
      ribofuranosylpurine publication chromatography #1
      adenine cyclonucleoside #1
      28disubstituted derivatives n6isopentenyladenine #1
      tobacco stem segments #1
      63methyl2butenylaminopurine bud formation #1
      exudation auxin #1
      tobacco bioaassy #1
      β ribofuranosylpurine #1
      zeatin ribosylcis #1
      trna fractions alanine #1
      butenylamino2 methylthiopurine #1
      2chlorozeatin esters activity #1
      callus tissue kinetin #1
      thiamine tissue content #1
      n6butyryl substituent #1
      21 bimonthly passages #1
      transfer rna fractions #1
      labeled kinetin #1
      cytokinin active #1
      begonia bryophyllum #1
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      Prominent publications by Folke Skoog

      KOL-Index: 9170

      Geometric and position isomers of zeatin and of ribosylzeatin and other compounds closely related to zeatin have been tested in the tobacco (Nicotiana tabacum var. Wisconsin No. 38) bioassay. None was more active than zeatin itself. There was a much greater difference in activity (> 50-fold) between trans- and cis-zeatin than between trans-isozeatin [6-(4-hydroxy-2-methyl-trans-2-butenylamino) purine] and cis-isozeatin [6-(4-hydroxy-2-methyl-cis-2-butenylamino) purine], the latter being ...

      Known for Cis Zeatin | Biological Activity | Ribosyl Trans | Nicotiana Tabacum | Cytokinins Synthesis
      KOL-Index: 9022

      It is well known that when the growing point of a young dicotyledonons plant is removed, the axillary buds lower down the stem grow out strongly, and eventually take the place of main stem. The presence of the terminal bud thus exercises an inhibiting action on the development of the lateral buds, causing them to remain dormant. To a smaller extent the leaves also inhibit the development of buds in their axils, as was shown by Dorsál (1909). The phenomenon has been studied by many ...

      Known for Growth Substance | Bud Development | Vicia Faba | Inhibiting Action | Inhibition Lateral
      KOL-Index: 8521

      Sixty-nine compounds, mostly purine derivatives and closely related substances, were tested for promotion of growth and regulation of organ formation in the tobacco bioassay to determine relationships between chemical structure and cytokinin activity. Forty-three substances were synthesized in this study, and 13 of these were reported for the first time. N6-Alkyladenines (I) varied in activity over a wide concentration range depending on the length of the alkyl chain. Starting with ...

      Known for Cytokinin Activity | Tobacco Bioassay | Adenine Derivatives | N6 Substituted | Chain Length
      KOL-Index: 7218

      Cytokinin activity in the culture medium of four pathogenic strains of Corynebacterium fascians varied from 168 to 0.4 mug of kinetin (6-furfurylaminopurine) equivalents per liter, as compared to 0.2 in an avirulent control. N(6)-Isopentenyladenine was the predominant cytokinin in the medium of all five strains, and its increased production was correlated with the degree of pathogenicity; however, the virulent strains also produced 8-13 times more cis-zeatin ...

      Known for Cytokinin Production | Corynebacterium Fascians | Virulent Strains | Culture Medium | Cis Zeatin
      KOL-Index: 7127

      Pelet, F., A. C. Hildebrandt, A. J. Riker, and F. Skoog. (U. Wisconsin, Madison.) Growth in vitro of tissues isolated from normal stems and insect galls. Amer. Jour. Bot. 47(3) : 186—195. Illus. 1960.–In a preliminary analysis of the nature of gall formation induced by insects, a comparative study has been made of the in vitro growth and nutrition of plant tissues derived from insect galls and from normal plants. Grape, elm, poplar, and willow tissues were grown on a standard medium, ...

      Known for Naa Kinetin | Gall Tissues | Callus Tissue | Basal Medium | Coconut Milk
      KOL-Index: 7048

      Transfer RNA from yeast, liver, and Escherichia coli has cytokinin activity in the tobacco callus bioassay, whereas ribosomal RNA from yeast is inactive. In contrast to fractions of yeast transfer RNA rich in serine acceptor and cytokinin activity, preparations (70 to 90 percent pure) of arginine transfer RNA(2), glycine transfer RNA, phenylalanine transfer RNA, and valine transfer RNA(1) and of highly purified alanine transfer RNA from yeast were inactive at concentrations of 20 to 2500 ...

      Known for Cytokinin Activity | Transfer Rna | Tobacco Callus Bioassay | Plants Toxic | Chromatography Escherichia
      KOL-Index: 6306

      Bioassays of tissue extracts show that high (500-1000 mug/liter) kinetin concentrations which permit growth of tobacco callus cultures on media without added thiamine activate the biosynthesis of this vitamin by the tissues. Although the tissue concentration of thiamine may fall appreciably, it is maintained at a level adequate for survival and slow growth of the cultures, and there is a large net increase in total thiamine content per culture with time. In the second and subsequent ...

      Known for Tobacco Callus Cultures | Thiamine Growth | Cytokinin Activation | Kinetin Concentrations | Tissue Presence
      KOL-Index: 6202

      The RNA base analogues, 2-thiouracil, 6-azauracil and 8-azaguanine incorporated singly into the medium, increased the number of floral buds in excised stem segments of Nicotiana tabacum variety Wisconsin No. 38 cultured in vitro. Combined treatments with 2 and 3 base analogues were even more effective. The effects were prevented by the corresponding natural counterparts, uracil, uridine, and guanosine respectively. These nucleic acid constituents added to cultures without base analogues ...

      Known for Stem Segments | Iaa Inhibition | Floral Buds | Flower Formation | Excised Tobacco
      KOL-Index: 5861

      Compounds related to dihydrozeatin that define the influence of the location of the hydroxyl group along the side chain have been synthesized and tested for cytokinin activity. The compounds compared are in the series: 6-(X-hydroxy-3-methylbutylamino)purines and their ribosides, where X = 2, 3, and 4.Hydroxy substitution on the 4-position of the side chain enhances, but in the 2-, 3-, or 2- and 3- positions, decreases cytokinin activity as compared with the unsubstituted isopentyl (or ...

      Known for Biological Activity | Mass Spectra | Compounds Zeatin | Tobacco Bioassay | Methyl 2
      KOL-Index: 5756

      THE MAIN RESULTS PRESENTED IN THIS ARTICLE MAY BE SUMMARIZED AS FOLLOWS: 1. A test method with deseeded Avena seedlings for small concentrations of auxin and precursors of auxin has been described. 2. This method makes possible quantitative determinations of about ten times as low concentrations of hormone as can be obtained with the standard method, (a) Through an increase in the time of the test, so that nearly all the hormone applied can be utilized. (b) Through an increase in ...

      Known for Small Amounts | Auxin Synthesis | Avena Test | Chemical Nature | Primary Leaves
      KOL-Index: 5317

      This distribution of cytokinin activity in tRNA species of Escherichia coli has been determined. Cytokinin activity was restricted to tRNA species recognizing codons with the initial letter U. The following have been shown to contain a cytokinin: tRNA(Phe), tRNA(Leu) UUG, tRNA(Ser)UC(G) (A), tRNA(Tyr), and tRNA(Try). tRNA(Cys) was present in fractions with cytokinin activity but was not sufficiently pure to prove it to be active. One tRNA(Ser) UC(C) (U) species was inactive. All major ...

      Known for Escherichia Coli | Cytokinin Activity | Bacterial Rna | Genetic Code | Cell Division
      KOL-Index: 5247

      The incorporation of (14)C-2-mevalonic acid into transfer RNA and ribosomal RNA (high molecular weight RNA) in rapidly growing, cytokinin-dependent tobacco (Nicotiana tabacum var. Wisconsin No. 38) callus cultures has been investigated. Approximately 40% of the label incorporated into transfer RNA was present in a ribonucleoside with chromatographic properties identical to those of cis-ribosylzeatin. The remainder of the label in the transfer RNA appears to be nonspecific incorporation ...

      Known for Mevalonic Acid | Tobacco Callus | Transfer Rna | Cytokinin Activity | Nicotiana Tabacum
      KOL-Index: 5161

      Pith tissue was cultured on modified White’s nutrient medium supplemented, except for controls, with 2 mg/l of IAA and/or 0,5 mg/l of kinetin. For autoradiographs sections were used from tissue grown on medium containing tritiated thymidine.Nuclear DNA contents (Feulgen) were measured by the microspectrophotometric two-wavelengths method. No fading of Feulgen dye in nuclei was found in 11 weeks, in contrast to considerable fading observed in earlier work when a different batch of basic ...

      Known for Dna Synthesis | Pith Tissue | Kinetin Iaa | Tritiated Thymidine | Excised Tobacco
      KOL-Index: 4986

      The esters of the highly active cytokinin zeatin [6-(4-hydroxy-3-methyl-trans-2-butenylamino) purine] with formic, propionic, and indole-3-acetic acids and of its 2-chloro-substituted derivative [2-chloro-6-(4-hydroxy-3-methyl-trans-2-butenylamino)purine] with acetic and propionic acids have been synthesized, and their growth-promoting activities in the tobacco bioassay have been determined and compared with those of four known, related compounds: zeatin, ...

      Known for Biological Activity | Tobacco Bioassay | Molar Basis | Active Zeatin | Methyl Trans2

      Key People For Cytokinin Activity

      Top KOLs in the world
      #1
      Folke Skoog
      cytokinin activity tobacco callus plant tissues
      #2
      David Stuart Letham
      zeatin riboside cell division leaf senescence
      #3
      Nelson J Leonard
      biological activity catalytic subunit unsaturated amines
      #4
      C O Miller
      urinary tract cell division vesicovaginal fistula
      #5
      Johannes van van Staden
      south africa seed germination medicinal plants
      #6
      Donald J Armstrong
      cytokinin oxidase callus tissues transfer rna

      Department of Botany, Birge Hall, University of Wisconsin, Madison, Wisconsin 53706 | Institute of Plant Development, Birge Hall, University of Wisconsin, Madison, Wisconsin 53706 | Institute of Plant Development, Department of Botany, University of

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