Search results for "Botany"
showing 10 items of 4586 documents
Rapid Quantification of Microalgae Growth with Hyperspectral Camera and Vegetation Indices
2021
Spectral cameras are traditionally used in remote sensing of microalgae, but increasingly also in laboratory-scale applications, to study and monitor algae biomass in cultures. Practical and cost-efficient protocols for collecting and analyzing hyperspectral data are currently needed. The purpose of this study was to test a commercial, easy-to-use hyperspectral camera to monitor the growth of different algae strains in liquid samples. Indices calculated from wavebands from transmission imaging were compared against algae abundance and wet biomass obtained from an electronic cell counter, chlorophyll a concentration, and chlorophyll fluorescence. A ratio of selected wavebands containing near…
Analyse des nouveaux systèmes de corrélations de croissance entre bourgeons s'établissant après une grêle chez la vigne
1982
<p style="text-align: justify;">A la suite d'un orage de grêle très violent des dégâts très importants sur les ceps ont entraîné des modifications profondes de l'équilibre entre les différents organes et en particulier entre tous les bourgeons épargnés par la grêle. Une étude fine des facteurs de l'entrée en croissance plus ou moins active de chaque type de bourgeon a été réalisée. Un fait intéressant a pu alors être constaté : l'entrée en croissance prématurée d'un assez grand nombre de bourgeons latents principaux (d'ordre N + 2) alors encore en état de prédormance. Celle ci ne s'est le plus souvent, pas poursuivie. Elle a néanmoins entraîné, l'année suivante, des modifications de l…
Les nucléotides du vin. Séparation, concentration et analyse par chromatographie sur échangeur d'anions
1976
<p style="text-align: justify;">La fraction de l'azote « nucléique » du vin est mal connue, non seulement du point de vue de sa composition, mais encore à cause de l'ignorance actuelle de son importance oenologique. Cette étude propose une technique permettant d'isoler et de purifier la fraction nucléotidique de l'azote libre qui est ensuite analysée oar chromatographie sur échangeur d'ions.</p>
A real-time PCR quantitative detection assay for Pseudomonas savastanoi pv. nerii in Nerium oleander
2008
A real-time PCR assay based on TaqMan chemistry was developed for the detection of Pseudomonas savastanoi pathovars that cause bacterial knot disease on different plant species. Primers and probe sequences were based on the iaaL gene coding for (indole-3-acetyl)-L-lysine synthetase and previously used in conventional PCR tests. Assay specificity was tested with an extended range of strains of P. savastanoi from eight hosts, with 13 other Pseudomonas spp., and with other microorganisms naturally occurring on or in oleander plants. A pure culture cell suspension was quantifi ed over a seven log concentration range (108 to 102 cfu ml-1 ). Different protocols were developed for the detection an…
First report of Diplodia africana on Grevillea robusta
2020
Branch cankers and dieback were observed on silky-oak trees (Grevillea robusta) along some streets of Palermo (Sicily, Italy). Fungi isolated from symptomatic branches were identified as Diplodia africana and D. seriata by morphological characters and phylogenetic analyses of combined ITS and translation elongation factor 1-α sequences. Pathogenicity was verified by inoculating twigs of 3-y-old silky-oak plants. This is the first report of D. africana on G. robusta and the first record of D. seriata on this host in the northern hemisphere.
The Mediterranean weedy vegetation and its origin
2007
An overview on the origin and evolutionary trends in the Mediterranean weedy vegetation is presented, with reference to the phytosociological units to which they are ascribed: Stellarietea mediae, Papaveretea rhoeadis, Oryzetea sativae. It is postulated that the &ldquo;Neolithic revolution&rdquo; was more likely a &ldquo;Neolithic evolution&rdquo;, i.e. the result of a process of selection and demographic growth that lasted for at least 10000 yrs, before leading to the domestication of plants and animals. During this very long time, wild crop relatives were simply growing together with the wild weed relatives, in their original milieu. At the beginning of agriculture, fields…
Antagonism of Bacillus subtilis strain AG1 against vine wood fungal pathogens
2009
Summary. Antagonistic substances produced by a Bacillus subtilis strain (AG1), which were previously found to slow down the growth of esca fungi in vitro, were produced in an artifi cial medium, isolated from the cell-free medium by precipitation and acidifi cation (to less than pH 2.5) and extracted from the precipitate with 96% ethanol. The crude extract employed in antibiotic assays confi rmed, in vitro, the antagonism of B. subtilis against Phaeoacremonium aleophilum and Phaeomoniella chlamydospora, and also showed antifungal activity toward Verticillium dahliae and Botryosphaeria rhodina.
Chemical Composition and Antibacterial Activity of Essential Oils from Different Parts of Bupleurum rotundifolium L.
2012
WOS: 000306925400016
Antinociceptive Effects of Turkish Endemic Eryngium kotschyi Boiss. Roots by Bioactivity Guided Fractionation
2010
Eryngium species (Apiaceae) are well known plants in ethnobotanical culture throughout world and also in Turkey. They are used as antitussive, diuretic as well as for analgesic and antiinflammatory purposes in traditional medicine. This study aimed to evaluate the antinociceptive activity of endemic Eryngium kotschyi Boiss. root extracts by bioguided fractionation. The antinociceptive activity of the extracts/fractions/compound was studied in mice using acetic acid induced writhing test and and hot plate test. The methanolic extract was sequentially partitioned with hexane, dichloromethane and water saturated n-butanol. Among the fractions, the n-BuOH fraction showed the most significant re…
Chemical Composition of the Essential Oil of Teucrium flavum ssp. flavum from Zakynthos, Greece
2012
Essential oil extracted from dried aerial parts of Teucrium flavum ssp. flavum harvested in Zakynthos, Greece, was analysed by gas phase chomatography (GC) and gas chomatography mass spectrometry (GC-MS). The main constituents were caryophyllene (13.5%), caryophyllene oxide (8.5%), 4-vinyl guaiacol (6.0%) and α- humulene (5.0%).