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Diffusa presenza della moria del pero causata da fitoplasmi in Italia. (Widespread occurrence of pear decline diseasein southern Italy).
No full text
Diffusa presenza della moria del pero causata da fitoplasmi in Italia. (Widespread occurrence of pear decline diseasein southern Italy).
No full textDetection and identification of Phytophthora species in southern Italy by RFLP and sequence analysis of PCR-amplified nuclear ribosomal DNA
No full textIn four neighbouring regions of southern Italy, Basilicata, Campania, Apulia and Calabria, pepper and zucchini plants showing Phytophthora blight symptoms, tomato plants with either late blight or buckeye rot symptoms, plants of strawberry showing crown rot symptoms and declining clementine trees with root and fruit rot were examined for Phytophthora infections by means of polymerase chain reaction (PCR) assays, using primers directed to nuclear ribosomal DNA (rDNA) repeat sequences. All diseased plants and trees examined tested positive. The detected fungal-like organisms were differentiated and characterized on the basis of primer specificity as well as through extensive restriction fragment length polymorphism (RFLP) and sequence analysis of PCR-amplified rDNA. Phytophthora capsici was identified in diseased pepper and zucchini plants, P. infestans was identified in tomato with late blight symptoms whereas buckeye rot-affected tomatoes and diseased strawberry plants proved to be infected by P. nicotianae and P. cactorum, respectively. Declining clementine trees were infected with P. citrophthora and P. nicotianae in about the same proportion. Also, thirty-one pure culture-maintained isolates of Phytophthora which had previously been identified in southern Italy by traditional methods but were never examined molecularly, were examined by RFLP and sequence analysis of PCR-amplified nuclear rDNA. Among these, an isolate from gerbera which had previously been identified by traditional methods only at genus level, was assigned to P. tentaculata. For the remaining pure culture-maintained isolates examined, the molecular identification data obtained corresponded with those delineated by traditional methods. Most of the diseases examined were already known to occur in southern Italy but the pathogens were molecularly detected and fully characterized at nuclear rDNA repeat level only from other geographic areas, very often outside Italy. A new disease to southern Italy was the Phytophthora blight of zucchini. This is also the first report on the presence and molecular identification of P. tentaculata from Italy
Fungal diversity in chestnut galls induced by Dryocosmus kuriphilus from Basilicata Region (Southern Italy)
Full text linkIn recent years, the Asian chestnut gall wasp (ACGW) Dryocosmus kuriphilus has been reported to have a high incidence in Italy and other Mediterranean basin countries. In 2021-2022, a study was undertaken in the Basilicata Region (Southern Italy) to investigate the relationship between the galls produced by ACGW on sweet chestnut (Castanea sativa Mill.) and fungal pathogens. In particular, the fungal diversity from green and necrotic galls collected from two important sweet chestnut sites (Melfi and Rionero in Vulture) was investigated. Nineteen fungal taxa were identified based on their morphological and molecular traits. In both localities, the most frequent species isolated from green and necrotic galls were Gnomoniopsis castaneae, Colletotrichum acutatum, and Pestalotiopsis sp. It is essential to understand the role played by the galls as an inoculum source for sweet chestnut fungal pathogens, particularly for G. castaneae, an emerging pathogen of which biology is still poorly understood. Findings from the present study stressed that the complex relationship between host-insect-microbial community needs to be elucidated to be able to control the pathogenic fungi and consequently maintain sweet chestnut trees' health as they play a key role in the local agriculture (horticulture, forestry) and subsidiary econom
Molecular characterization of stolbur phytoplasma infecting weeds, vegetables and grapevine, based on vmp1 gene variability.
No full textIl re sole bizantino. Note su ideologia imperiale e teocrazia nell’impero d’Oriente
No full textL’articolo tratta del simbolo teocratico per eccellenza, quello del re sole. Nella premessa, l’autore propone di definire la teocrazia “l’esercizio di un potere sciolto da ogni giustificazione istituzionale e connesso a una necessità naturale di portata cosmica”. Il testo prende le sue mosse dal dominato romano; il primo capitolo, in effetti, si concentra sull’uso del simbolo del re sole nella tarda antichità. Si esaminano qui alcuni passaggi tratti da autori sia pagani che cristiani – quali, tra gli altri, Eusebio di Cesarea, l’imperatore Giuliano, Temistio, Sinesio, Agapeto. Il secondo capitolo verte piuttosto sulle principali attestazioni del simbolo del re sole a Bisanzio; è dedicato dunque all’analisi di estratti di opere di Giorgio di Pisidia, Costantino VII, Michele Psello, Teodoro Prodromo e molti altri. Pure la cerimonia della prokypsis è fatta oggetto d’indagine in questo contesto. Il terzo capitolo, infine, accenna alla ripresa del simbolo del re sole nella Russia e nell’Europa occidentale fra XV e XVIII secolo.The article deals with the theocratic symbol par excellence, that of the Sun King. In the preface, the author proposes to define theocracy as the exercise of a power freed from all institutional justification and linked to a natural necessity of cosmic scope. The article takes the Roman Dominate as its starting point. The first chapter focuses on the use of the Sun King symbol in Late Antiquity. Some passages taken from both pagan and Christian authors – such as, among others, Eusebius of Caesarea, Emperor Julian, Themistius, Synesius, Agapetus – are examined here. The second chapter addresses the main attestations of the Sun King symbol in Byzantium. It is devoted to the analysis of excerpts from works by George of Pisidia, Emperor Constantine VII, Michael Psellos, Theodore Prodromos, and several others. The prokypsis ceremony is also investigated here. The third chapter, finally, mentions the revival of the Sun King symbol in Russia and Western Europe between the 15th and 18th centuries
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
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