1,721,014 research outputs found
The antimicrobial actitity of water extracts from Labiatae.
No full textIn vitro antimicrobial activity of water extracts of oregano, rosemary and sage were tested against five different fungi (Phytophthora cactorum, Verticillium dahliae, Fusarium oxysporum f.sp. lycopersici, Phoma tracheiphila and Botrytis cinerea). Infusion, decoction and maceration methods were used to obtain the extracts. Their inhibent effect on radial fungal growth was determined at three different concentrations (500 mL/L, 50 mL/L and 5 mL/L). After 4, 8 and 12 days the radial growth of the species was measured and fungitoxicity was recorded in terms of percent colony inhibition. The data obtained showed that while the extracts of rosemary and sage were less effective against all fungi tested at all concentrations and by all extraction methods used, oregano extract showed a strong antifungal activity at higher concentration by infusion and decoction methods
ATTIVITA' INIBENTE DEGLI ESTRATTI ACQUOSI DI INULA VISCOSA E PELARGONIUM GRAVEOLENS SULL'ACCRESCIMENTO "IN VITRO" DI FUNGHI FITOPATOGENI
No full textFungistatic activity of essential oils of Laurus nobilis, Mentha X Piperita and Ruta graveolens against Rhizoctonia solani Kunn and Sclerotinia sclerotiorum (L.) De Bary
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Efficacy of Clove Essential Oil an Sodium Bicarbonate to Control Powdwry Mildew and Grey Mould in the Strawberry Crops
No full textStraberry growning in greenhouse is frequently affected by diseases which are controlled by means of chemical products.In order to find an alternative to synthetic fungicides, the antifungal activity of clove essential oil and Sodium bicarbonate were tested to control powdery mildew (causal agent Oìdium fragaria (Harz.)and grey mould and grey mould (Botrytis cinerea Pers.) "in vitro" and in planta essays "In vitro" essay the inhibition efficacy of natural substances was evaluated on O.fragariae conidial germination and on B. cinerea mycelial growth. The results showed a consistent fungicidal activity in all concentrations tested. In planta essay, treatments were carried out in greenhouse on the strawberry cultivar Tudla. Concentrations at 0,125 an 0,5 ml/l of the essential oil and concentrations at 1 and 0,25 g/l of Sodium bicarbonate were sprayed on the plants. The controls were a standard chemical control (sulphur+ pyrimethanil) and an untreated strawberries: Treatments were applied every 7-8 days after the first syntoms of diseases appeared. Incidence of diseases has been checked at harvest-time on 100 fruits. Quantitative and qualitative parameters have been also checked in order to evaluate the effects of treatments on strawberries quality. Essential oil at 0,5 ml/l and Sodium bicarbonate at 0,25 g/l treatments controlled powdwry mildew more than grey mould which showed a number of affecteed fruits like the untreated control. No toxicity phenomena have been found at both concentrations. These results support the possibility to useful natural substances in the integrates management of strawberry powdery mildew
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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