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  • 1
    Electronic Resource
    Electronic Resource
    Agressivite deConidiobolus obscurus via-a-vis du puceron du pois III. Activites enzymatiques exocellulaires (1984)
    Springer
    BioControl 29 (1984), S. 185-201 
    Details
    ISSN: 1573-8248
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Summary The chitinase, protease and lipase activities of aggressive (Ag+) and non-aggressive (Ag−) strains ofConidiobolus obscurus (Hall & Dunn) Remaudière & keller have been studied in agar and agitated liquid cultures. The strains produced different quantities of proteases, but no relationship could be established between protease activity and pathogenicity. In contrast, the lipase-esterase activity of Ag− strains observed in liquid media is greater than that of Ag+ strains. All Ag+ strains produced a chitinase and are capable of metabolising the N-acetyl glucosamine (NAG) liberated. In contrast, of the Ag− strains, some do not possess chitinase activity while others secrete this enzyme but cannot metabolize the NAG liberated.
    Notes: Résumé Les activités chitinasique, protéasique et lipasique de souches deConidio bolus obecurus (Hall& Dunn) Remaudière & Keller ont été étudiées en milieu gélosé et en culture liquide agitée. Les souches sécrètent des protéases à des taux diffℰrents mais aucune relation n'a pu être établie entre l'intensité des protéases étudiées et l'agressivité des souches. Par contre, l'activité lipasique-estérasique des souches non agressives (Ag−) observée en milieu liquide est plus importante que celle des souches agressives (Ag+). Toutes les souches Ag+ produisent une chitinase et sont capables de métaboliser la N-acétylglucosamine (NAG) libérée. Au contraire, les souches Ag− n'ont pas d'activité chitinasique ou celles qui excrètent cette enzyme ne peuvent métaboliser la NAG libérée.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02372108
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Agressivité de Conidiobolus obscurus vis à-vis du puceron du pois (1984)
    Springer
    Mycopathologia 86 (1984), S. 3-19 
    Details
    ISSN: 1573-0832
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Abstract Different physical (temperature, pH, light and osmotic pressure) and nutritional factors (salts, vitamins, sugars and protein hydrolysates) were tested on the germination of primary conidia of Conidiobolus obscurus. The most important total germination levels were obtained at 24 δC, in continuous light on an agar medium containing dextrose and vitamins or yeast extract. Temperatures ranging from 19 to 24°, a basic pH (8–10), darkness and the presence of dextrose and/ or protein hydrolysates stimulated the formation of germ tubes. The strains of C. obscurus studied were classified in 2 groups depending on their aggressivity against the pea aphid and their mode of germination in vitro.
    Notes: Résumé L'influence de différents facteurs physiques (température, pH, lumière, pression osmotique) et nutritionnels (sels, vitamines, sucres et hydrolysats de protéine) a été étudiée sur la germination des conidies primaires de Conidiobolus obscurus. Les germinations globales les plus élevées sont obtenues à 24 °C, à la lumière sur un milieu gélosé contenant du glucose et des vitamines ou de l'extrait de levure. Une température comprise entre 19 et 24 °C, un pH basique (8–10), l'obscurité et la présence de glucose et/ ou d'hydrolysats de protéine stimulent l'émission de tubes germinatifs. Les souches ont pu être classées en 2 groupes en fonction de leur mode de germination in vitro et de leur agressivité vis-à-vis du puceron du pois.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00437224
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  • 3
    Electronic Resource
    Electronic Resource
    Agressivité deConidiobolus obscurus vis-a-vis du puceron du pois,Acyrthosiphon pisum (Hem.: Aphididae] 1.-Comportement des conidies sur la cuticule avant la pénétration du tube germinatif dans l'insecte (1982)
    Springer
    BioControl 27 (1982), S. 323-330 
    Details
    ISSN: 1573-8248
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Summary Seven strains ofConidiobolus obscurus (Hall & Dunn) Remaudière & Keller were classified into 2 groups depending on their pathogenicity against the pea aphid. Variations in germination patterns on the aphid cuticle were related to differences in pathogenicity of the strains. Primary conidia of the virulent strains germinated in higher concentration than the avirulent ones; furthermore, the former have a greater tendandy to produce germ tubes than secondary conidia.
    Notes: Résumé Sept souches deConidiobolus obscurus (Hall & Dunn) Remaudière & Keller ont pu être classées en 2 groupes en fonction de leur pathogénicité vis-à-vis du puceron du pois. Les conidies primaires des souches agressives germent en pourcentage plus élevé que les conidies des souches non agressives (incapables d'infecter des pucerons). Elles ont aussi une meilleure propension à émettre des tubes germinatifs plutôt que des conidies secondaires.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374815
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  • 4
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    The Gaia-ESO Survey: pre-main-sequence stars in the young open cluster NGC 3293 (2016)
    Oxford University Press
    Details
    Publication Date: 2016-06-23
    Description: The young open cluster NGC3293 is included in the observing program of the Gaia -ESO survey (GES). The radial velocity values provided have been used to assign cluster membership probabilities by means of a single-variable parametric analysis. These membership probabilities are compared to the results of the photometric membership assignment of NGC3293, based on UBVRI photometry. The agreement of the photometric and kinematic member samples amounts to 65 per cent, and could increase to 70 per cent as suggested by the analysis of the differences between both samples. A number of photometric PMS candidate members of spectral type F are found, which are confirmed by the results from VPHAS photometry and SED fitting for the stars in common with VPHAS and GES data sets. Excesses at mid- and near-infrared wavelengths, and signs of Hα emission, are investigated for them. Marginal presence of Hα emission or infilling is detected for the candidate members. Several of them exhibit moderate signs of U excess and weak excesses at mid-IR wavelengths. We suggest that these features originate from accretion discs in their last stages of evolution.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 5
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    Susceptibility to the pinewood nematode (PWN) of four pine species involved in potential range expansion across Europe (2015)
    Oxford University Press
    Details
    Publication Date: 2015-09-25
    Description: The pine wilt disease (PWD), caused by the pinewood nematode (PWN) Bursaphelenchus xylophilus (Steiner et Buhrer) Nickle, is one of the most serious threats to pine forests worldwide. Here we studied several components of susceptibility to PWN infection in a model group of pine species widely distributed in Europe ( Pinus pinaster Ait., P. pinea L., P. sylvestris L. and P. radiata D. Don), specifically concerning anatomical and chemical traits putatively related to nematode resistance, whole-plant nematode population after experimental inoculation, and several biochemical and physiological traits indicative of plant performance, damage and defensive responses 60 days post inoculation (dpi) in 3-year-old plants. Pinus pinaster was the most susceptible species to PWN colonization, with a 13-fold increase in nematode population size following inoculation, showing up to 35-fold more nematodes than the other species. Pinus pinea was the most resistant species, with an extremely reduced nematode population 60 dpi. Axial resin canals were significantly wider in P. pinaster than in the other species, which may have facilitated nematode dispersal through the stem and contributed to its high susceptibility; nevertheless, this trait does not seem to fully determinate the susceptible character of a species, as P. sylvestris showed similar nematode migration rates to P. pinaster but narrower axial resin canals. Nematode inoculation significantly affected stem water content and polyphenolic concentration, and leaf chlorophyll and lipid peroxidation in all species. In general, P. pinaster and P. sylvestris showed similar chemical responses after infection, whereas P. radiata , which co-exists with the PWN in its native range, showed some degree of tolerance to the nematode. This work provides evidence that the complex interactions between B. xylophilus and its hosts are species-specific, with P. pinaster showing a strong susceptibility to the pathogen, P. pinea being the most tolerant species, and P. sylvestris and P. radiata having a moderate susceptibility, apparently through distinct coping mechanisms.
    Print ISSN: 0829-318X
    Electronic ISSN: 1758-4469
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Oxford University Press
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  • 6
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    Stellar open clusters membership probabilities: an N-dimensional geometrical approach (2016)
    Oxford University Press
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    Publication Date: 2016-02-28
    Description: We present a new geometrical method aimed at determining the members of open clusters. The methodology estimates, in an N -dimensional space, the membership probabilities by means of the distances between every star and the cluster central overdensity. It can handle different sets of variables, which have to satisfy the simple condition of being more densely distributed for the cluster members than for the field stars (as positions, proper motions, radial velocities and/or parallaxes are). Unlike other existing techniques, this fact makes the method more flexible and so can be easily applied to different data sets. To quantify how the method identifies the cluster members, we design series of realistic simulations recreating sky regions in both position and proper motion subspaces populated by clusters and field stars. The results, using different simulated data sets ( N = 1, 2 and 4 variables), show that the method properly recovers a very high fraction of simulated cluster members, with a low number of misclassified stars. To compare the goodness of our methodology, we also run other existing algorithms on the same simulated data. The results show that our method has a similar or even better performance than the other techniques. We study the robustness of the new methodology from different subsamplings of the initial sample, showing a progressive deterioration of the capability of our method as the fraction of missing objects increases. Finally, we apply all the methodologies to the real cluster NGC 2682, indicating that our methodology is again in good agreement with preceding studies.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 7
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    Physiological trade-offs in the complexity of pine tree defensive chemistry (2014)
    Oxford University Press
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    Publication Date: 2014-09-27
    Print ISSN: 0829-318X
    Electronic ISSN: 1758-4469
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Oxford University Press
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  • 8
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    Analysis of the kinematic structure of the Cygnus OB1 association (2016)
    Oxford University Press
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    Publication Date: 2016-12-24
    Description: The main objective of this study is the characterization of the velocity field in the Cygnus OB1 association using the radial velocity data currently available in the literature. This association is part of a larger star-forming complex located in the direction of the Cygnus region, but whose main subsystems may be distributed at different distances from the sun. We have collected radial velocity data for more than 300 stars in the area of 5 x 5 deg 2 centred on the Cygnus OB1 association. We present the results of a kinematic clustering analysis in the subspace of the phase space formed by angular coordinates and radial velocity using two independent methodologies. We have found evidence of structure in the phase space with the detection of two main groups, corresponding to different radial velocity and distance values, belonging to the association, and associated with two main shells defined by the Hα emission. A third grouping well separated from the other two in velocity appears to occupy the whole region associated with what has been called ‘common shell’.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 9
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    Vermicomposting of wastewater sludge from paper-pulp industry with nitrogen rich materials (1997)
    Elsevier
    Details
    Publication Date: 1997-03-01
    Print ISSN: 0038-0717
    Electronic ISSN: 1879-3428
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Elsevier
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  • 10
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    Spatio-temporal variation of stable isotope ratios in earthworms under grassland and maize cropping systems (2001)
    Elsevier
    Details
    Publication Date: 2001-10-01
    Print ISSN: 0038-0717
    Electronic ISSN: 1879-3428
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Elsevier
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