1,721,076 research outputs found
Phylogenomic analysis resolves the evolutionary pattern of diversification of cyanobacteria and reveals the evolutionary affinity of novel Antarctic lineages
Full text linkEstablishing phylogenetic relationships among the major cyanobacterial lineages remains elusive. Here we report a phylogenetic analysis of a large and well curated dataset, which allowed us to resolve with maximum statistical support the general pattern of cyanobacterial diversification and to address the limited knowledge regarding the diversity of Antarctic cyanobacteria. The analysis included novel Metagenome-Assembled Genomes (MAGs) sampled from diverse lithic habitats across Antarctica at elevations up to 3.4 km. The results presented here revealed previously undetected lineages and provided a robust phylogenetic framework for a natural cyanobacterial classificatio
AMBIENTE LITICO E SPECIAZIONE. CARATTERIZZAZIONE SU BASE MOLECOLARE DI UN NUOVO TAXON DI FUNGHI NERI MERISTEMATICI DI PROVENIENZA ALPINA
No full textCARATTERIZZAZIONE MOLECOLARE DI FUNGHI MELANIZZATI ISOLATI DA ROCCE PROVENIENTI DA AMBIENTI ESTREMI. DATI PRELIMINARI
No full textRock-inhabiting fungi and their role in deterioration of stone monuments in the Mediterranean area
No full textMost of the cultural heritage is in the Mediterranean area. Stone was historically the most durable and widely used building material; therefore, the greatest deal of antiques is represented by stone monuments located in outdoor environments. Atmospheric agents, pollution, and various stresses are the main causes of deterioration of artistic heritage as well as many micro-organisms that often cause irreversible damages. Conservation of this invaluable patrimony, therefore, is a demanding challenge. Rock-inhabiting fungi (RIF) are very active agents causing visible alteration patterns and exfoliation of stone monuments; ecological conditions in the Mediterranean rocks are optimal for RIF development. Along with environmental conditions, fungal colonization depends also on bioreceptivity of the surfaces and survival strategies of colonizing species. This paper represents an overview of RIF biodiversity on stone monuments known at present, mechanisms of attack and colonization and outdoor conditions allowing the settlement of RIF propagules, colonization, and the following biodeterioration processe
Isolation and screening of fungi as potential degradors of volatile aromatic hydrocarbons
No full textRock black fungi: excellence in the extremes. From the Antarctic to Space
No full textThis work focuses on rock-inhabiting fungi (RIF) of Antarctic rocky deserts, considered the closest to a possible Martian habitat, as the best example of adaptation to the extremes. The study of RIF ecophysiology, resistance and adaptation provides tools that shed light on the evolution of extremophily. These studies also help define the actual limits for life and provide insight for investigating its existence beyond our planet. The scientific results obtained from over 20 years of research on the biodiversity, phylogeny and evolution toward extremotolerance reviewed here demonstrate how these fascinating organisms can withstand conditions well beyond those in their natural environment. A final focus is given on results and perspectives arising from a recent proteomic approach, and from astrobiological experiments and their significance for future space exploration. These studies demonstrate that Antarctic RIF offer an excellent opportunity to investigate many basic, but also applicative areas of research on extremophily
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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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