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Le “ nuove specie infestanti delle colture a ciclo autunno-vernino e le modalità per il loro controllo
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Classification of Italian Xanthium strumarium complex based on biological traits, electrophoretic analysis and response to maize interference
No full textXanthium strumarium complex was studied taking plant seeds from 16 diverse locations in Italy. Plant morphophysiological traits were noted and electrophoretical analysis of seed reserve proteins was carried out from individual plants grown at the same site, in the presence and absence of competition from maize. Significant correlations between diverse plant phenological traits, the geographical origin of the seeds and the seed protein electrophoretic patterns were found. A high correlation between seed reserve proteins and the genetic structure of this weed was also detected. Maize competition increased Xanthium stem growth and decreased bur production and number of branches. Xanthium plant populations could be classified according to the morphological characters evaluated in three groups closely related to their geographical original area and latitude (northern, central and southern Italy), each showing precise morphological traits of Xanthium italicum, X. strumarium and X. orientale respectively. Electrophoresis supported the classification of these three morphological groups
Strategie di diserbo in un oliveto secolare del sud-italia: primi risultati dell’utilizzo di “indici integrati” per la valutazione qualitativa della flora infestante
No full textClassification of Italian Xanthium strumarium complex based on biological traits, electrophoretic analysis and response to maize interference
No full textXanthium strumarium complex was studied taking plant seeds from 16 diverse locations in Italy. Plant morphophysiological traits were noted and electrophoretical analysis of seed reserve proteins was carried out from individual plants grown at the same site, in the presence and absence of competition from maize. Significant correlations between diverse plant phenological traits, the geographical origin of the seeds and the seed protein electrophoretic patterns were found. A high correlation between seed reserve proteins and the genetic structure of this weed was also detected. Maize competition increased Xanthium stem growth and decreased bur production and number of branches. Xanthium plant populations could be classified according to the morphological characters evaluated in three groups closely related to their geographical original area and latitude (northern, central and southern Italy), each showing precise morphological traits of Xanthium italicum, X. strumarium and X. orientale respectively. Electrophoresis supported the classification of these three morphological groups
Effects of some enviromental factors on the germination of Silybum marianum Gaertner seeds
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