Search Results - (Author, Cooperation:B. Howlett)
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1Latest Papers from Table of Contents or Articles in PressL. A. Garibaldi ; I. Steffan-Dewenter ; R. Winfree ; M. A. Aizen ; R. Bommarco ; S. A. Cunningham ; C. Kremen ; L. G. Carvalheiro ; L. D. Harder ; O. Afik ; I. Bartomeus ; F. Benjamin ; V. Boreux ; D. Cariveau ; N. P. Chacoff ; J. H. Dudenhoffer ; B. M. Freitas ; J. Ghazoul ; S. Greenleaf ; J. Hipolito ; A. Holzschuh ; B. Howlett ; R. Isaacs ; S. K. Javorek ; C. M. Kennedy ; K. M. Krewenka ; S. Krishnan ; Y. Mandelik ; M. M. Mayfield ; I. Motzke ; T. Munyuli ; B. A. Nault ; M. Otieno ; J. Petersen ; G. Pisanty ; S. G. Potts ; R. Rader ; T. H. Ricketts ; M. Rundlof ; C. L. Seymour ; C. Schuepp ; H. Szentgyorgyi ; H. Taki ; T. Tscharntke ; C. H. Vergara ; B. F. Viana ; T. C. Wanger ; C. Westphal ; N. Williams ; A. M. Klein
American Association for the Advancement of Science (AAAS)
Published 2013Staff ViewPublication Date: 2013-03-02Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Animals ; Bees/physiology ; Crops, Agricultural/*growth & development ; Flowers/physiology ; Fruit/*growth & development ; Insects/*physiology ; *PollinationPublished by: -
2Articles: DFG German National LicensesStaff View
ISSN: 1420-8938Source: Springer Online Journal Archives 1860-2000Topics: MathematicsNotes: Abstract. Let W be the Weyl group of a connected reductive group over a finite field. It is a consequence of the Borel-Tits rational conjugacy theorem for maximal split tori that for certain reflection subgroups W 1 of W (including all parabolic subgroups), the elements of minimal reflection length in any coset wW 1 are all conjugate, provided w normalises W 1. We prove a sharper and more general result of this nature for any finite Coxeter group. Applications include a fusion result for cosets of reflection subgroups and the counting of rational orbits of a given type in reductive Lie algebras over finite fields.Type of Medium: Electronic ResourceURL: -
3Articles: DFG German National LicensesStaff View
ISSN: 1365-2222Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: MedicineNotes: Immunoglobulin E (IgE), directed against components of Acacia (wattle) pollen, has been detected by radioallergosorbent tests (RAST) in the sera of some children and adults who develop allergic symptoms in the presence of flowering Acacia trees in Australia. All these subjects also had high levels of IgE directed against Lolium perenne (rye grass) pollen. Inhibition by RAST showed that most of the IgE molecules which bound to Acacia pollen components also bound to L. perenne pollen extracts, and to Glycoprotein I, the major allergen of L. perenne pollen. In these assays, the allergens have been immobilized on polyvinyl chloride microtitre trays: the sensitivity of this approach is compared to that of commercial RAST kits.Type of Medium: Electronic ResourceURL: -
4Articles: DFG German National LicensesJ. Marcroft, S. ; Sprague, S. J. ; Salisbury, P. A. ; Howlett, B. J.
Oxford, UK : Blackwell Science Ltd
Published 2004Staff ViewISSN: 1365-3059Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, NutritionNotes: Pseudothecial density of the blackleg fungus Leptosphaeria maculans and discharge of ascospores was measured from stubble of a range of Brassica species, including Brassica napus (canola) cultivars, with a range of blackleg resistance. Since ascospores are the primary inoculum, these parameters reflect inoculum potential for blackleg. Stubble from a representative line of each of B. carinata, B. nigra, Sinapis alba and B. napus cv. Surpass 400 (incorporates blackleg resistance from B. rapa ssp. sylvestris) had lower pseudothecial density and discharged fewer ascospores than stubble of other B. napus cultivars (Karoo, Oscar, Emblem, Dunkeld and Columbus). These latter B. napus cultivars and a representative B. juncea line had higher pseudothecial densities and discharged higher numbers of ascospores. If this trait of low blackleg inoculum from stubble could be introgressed into commercial canola cultivars, blackleg disease severity could be substantially reduced, resulting in higher and more stable canola yields. However, the trait of reduced ascospore discharge may not be stable, as demonstrated by the B. rapa ssp. sylvestris-derived resistance already being overcome by the blackleg fungus in Australia.Type of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesStaff View
ISSN: 0005-2728Keywords: ATPase ; Azide inhibition ; CF"1 ; Chloroplast ; Protonmotive force ; ThylakoidSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyMedicinePhysicsType of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesStaff View
ISSN: 0005-2728Keywords: (Spinach) ; ATPase ; CF"1 ; Chloroplast ; N-Ethylmaleimide ; SulfiteSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyMedicinePhysicsType of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesStaff View
ISSN: 0003-2697Keywords: Lowry method ; protein determinationSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyType of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesStaff View
ISSN: 0038-0121Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: SociologyEconomicsType of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesStaff View
ISSN: 0168-9452Keywords: Particle bombardment ; Protein production ; S-locus glycoprotein (SLG) ; S-locus related glycoprotein-1 (SLR1) ; Self-incompatibility ; Tobacco cell cultureSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyType of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesStaff View
ISSN: 1573-6865Source: Springer Online Journal Archives 1860-2000Topics: BiologyMedicineNotes: Summary Two major glycoproteins have been localized in sectioned grains of ryegrass pollen by direct and indirect immunofluorescence methods using Fluorescein isothiocyanate (FITC)-labelled IgC fractions of antisera. These glycoproteins are the major allergen Group 1 allergen, and a principal antigen Antigen A. Four methods of fixation were employed: freeze-drying, methanol, 2.5% glutaraldehyde and 4% paraformaldehyde for 1 h at 4°C. The post-embedding staining technique of immunocytochemistry was used: anthers were embedded directly, or after dehydration, in JB-4 plastic resin and antibody reacted with sectioned pollen. The effects of these fixatives on the antibody combining sites of the antigens were quantified by a solid phase radioimmunoassay using [125I]protein A to measure antibody binding. Glutaraldehyde was the only fixative to significantly depress antibody binding of both Antigen A and Group 1 allergen to their homologous antisera. This radioimmunoassay was modified to reyeal that FITC conjugation to either antibody did not impair antigen binding. In mature pollen, these antigens were located in the cytoplasm and in the complex wall. In developing grains early in the maturation period, specific fluorescence was concentrated at the periphery of the cytoplasm.Type of Medium: Electronic ResourceURL: -
11Articles: DFG German National LicensesStaff View
ISSN: 1573-6865Source: Springer Online Journal Archives 1860-2000Topics: BiologyMedicineType of Medium: Electronic ResourceURL: -
12Articles: DFG German National LicensesStaff View
ISSN: 1573-6865Source: Springer Online Journal Archives 1860-2000Topics: BiologyMedicineNotes: Summary The cellular sites of the glycoproteins Group 1 allergen (glycoprotein 1) and Antigen A (glycoprotein 2) in mature ryegrass pollen have been investigated by immunoelectron microscopy. Radioimmunoassays confirm previous findings of cross-reactivity between the purified glycoprotein antigens at the high immunoglobulin G (IgG) concentrations used for localization. Freeze-drying of anthers followed by anhydrous processing has been employed because of the water solubility and mobility of the glycoproteins. A double-embedding technique has been developed. This involves, first, embedding anthers in the water-soluble plastic resin JB-4, sectioning and incubating in ferritin-labelled antisera by the indirect method. The sections are then embedded in Spurr's resin for ultra-thin sectioning. Both glycoproteins are found in the following sites: (1) exine and intine wall layers; (2) pollen cytoplasm; (3) the orbicules and anther loculus; and (4) the anther cuticle. In the exine arcades and surface and in the anther loculus, the ferritin label is bound to pollenkitt. The finding that the glycoproteins are in similar sites is predictable in view of the cross-specificity of the antisera. The extent of antibody penetration of the plastic sections has been examined; labelling is confined to cut grains and absent from intact grains.Type of Medium: Electronic ResourceURL: -
13Articles: DFG German National LicensesStaff View
ISSN: 1617-4623Keywords: Key wordsLeptosphaeria maculans ; Cyanide hydratase ; Brassica ; GlucosinolateSource: Springer Online Journal Archives 1860-2000Topics: BiologyNotes: Abstract A gene encoding a cyanide hydratase was cloned from an aggressive isolate of Leptosphaeria maculans, the fungus which causes blackleg disease of oilseed Brassica spp. This enzyme catalyses the breakdown of hydrogen cyanide to a less toxic compound, formamide. The predicted amino acid sequence of cyanide hydratase in L. maculans is 77% and 82% identical to cyanide hydratases from two other ascomycetes, Gloeocercospora sorghi and Fusarium lateritium, respectively. The gene is present as a single copy in the L. maculans genome, in both aggressive and non-aggressive isolates, although there is a restriction fragment length polymorphism between these two isolate groups for this gene. The cyanide hydratase promoter contains four putative target sites for GATA transcription factors, proteins that regulate nitrogen metabolism and other processes. Transcription of cyanide hydratase in an aggressive L. maculans isolate is induced strongly by potassium cyanide. Transcription of the gene is detectable in cotyledons of Brassica juncea and B. napus during infection. L. maculans can utilise the reaction product, formamide, as a sole source of nitrogen.Type of Medium: Electronic ResourceURL: