Search results for "lcsh:Botany"
showing 10 items of 177 documents
The influence of yeast glycosylated proteins on tannins aggregation in model solution
2004
<p style="text-align: justify;">The incidence of glycosylated yeast proteins on tannins aggregation in model solution was investigated using the spectrophotometric method (absorbance 700 nm). Glycosylated proteins released by two commercial <em>Saccharomyces cerevisiae</em> strains (RC212 and BM 45) during alcoholic fermentation in synthetic media, glycosylated proteins extracted by Peat’s method and industrial glycosylated proteins purified and separated by chromatography on Sepharose Concanavalin A were used to visualize effects on tannins aggregation. Results showed that tannins aggregation was limited by the glycosylated proteins according to their origin and their mod…
Demonstration of a correlation between young leaves, apex and young bunches specific to a young grapevine cutting in the first period of its developm…
2001
<p style="text-align: justify;">The development of hardwood cutting of grapevine comprise 4 succesive phases. Phase I: first period of shoot extension. Phase II: characterized by a slow growth due to a very low activity of the terminal bud. Phase III: reactivation of the growth consecutive to a resumption of the apical activity. Phase IV: when the growth becomes maximal.</p><p style="text-align: justify;">The objective of this work has been to identify the cause of the slowdown of the activity of apical bud during the phase II.</p><p style="text-align: justify;">In a first experiment, we have compared the effects of three modes of defoliation applied from the b…
Tipificación de dos nombres del género Verbascum incluidos en la subsect. Singuliflora (Scrophulariaceae)
2020
Se designan los tipos nomenclaturales de Verbascum barnadesii y V. fontqueri (≡ Celsia valentina (Scrophulariaceae) a partir de especímenes conservados en los herbarios C y BC, respectivamente.
Fungal pathogens associated with grapevine trunk diseases in young vineyards in Sicily
2020
After the first report of grapevine decline caused by Botryosphaeriaceae in Sicily in 2007, epidemiological studies carried out in mature vineyards until 2011 confirmed the widespread occurrence of “Botryosphaeria dieback” and the “Esca complex” disease. Dieback symptoms were also recently observed in two young vineyards in Partanna and Castellammare del Golfo in western Sicily (Trapani province). Declining vines were inspected for grapevine trunk disease (GTD) symptoms, and were uprooted and submitted for analyses. Fungal isolates were collected and identified using culturing and molecular analyses. One isolate per identified species was inoculated to three grapevine shoots to evaluate pat…
Flavonoids from Teucrium fruticans L.
2014
From aerial parts of <em>Teucrium fncticans</em> L. three flavonoids were isolated and identified as 5-hydroxy-6, 7, 3', 4'-tetramethoxyflavone, 5, 4'-dihydroxy-6, 7, 3'-trimethoxyflavone (cirsilineol) and 5, 4'-dihydroxy-6, 7-dimethoxyflavone (cirsimaritin). The former compound was found to be a predominant flavone aglycone constituent of the plant material. This is the first report on the isolation of flavonoids from the plant.
Notas sobre flora leonesa amenzada
2012
Se aportan citas nuevas para 34 taxones de flora vascular incluidos en el Catálogo de Flora Protegida de Castilla y León y/o en la Lista Roja de la Flora Vascular Española, de los que se conocían pocas (o ninguna) localidades leonesas.SUMMARY: We provide new records of 34 taxa included in the Catalogue of Protected Flora of Castilla y León and/or in the Red List of Spanish Vascular Flora. Some of them represent additions to the checklist of flora of the province of León and the distribution of the others is not well known.
Notas taxonómicas y distributivas sobre Serapias lingua subsp. tunetana (Orchidaceae), una rara espècie endémica de Túnez
2019
Serapias lingua subsp. tunetana, a rare endemic orchid confined to Tunis, northern of Tunisia, has been rediscovered far away from its type locality nearly after 22 years. Since its first finding in 1996 and its description published in 2005, the subspecies has not been found again, and was presumed to be extinct, or the taxon was erroneously identified. A detailed description of the subspecies justifying an amendment to its description, a map of its current distribution and colour photographs are also provided. The affinities to the related taxa within the S. lingua group occurring in Tunisia are here presented. The global IUCN status for this taxon is evaluated. Serapias lingua subsp. tun…
Distribution, ecology and conservation status of Dionysia involucrata Zaprjag., an endangered endemic of Hissar Mts (Tajikistan, Middle Asia)
2014
<em>Dionysia involucrata</em> Zaprjag. (Primulaceae) is known as critically endangered endemic species of Hissar Mountains in Tajikistan. It is reported from few localities mainly in Varzob River valley and its tributaries. The species inhabits steep or overhanging faces of granite rocks in narrow river gorges. During the research all known populations of <em>D. involucrata</em> were examined in respect of the habitat conditions and species composition of vegetation plots. We analyzed the population extent of the species in its range in Tajikistan and the main threats in order to assess its conservation status. The detrended correspondence analysis was performed on a…
Los bosques riparios de Cantabria II. Saucedas de Salix atrocinerea y avellanedas relacionadas
2019
Ecologic and phytosociological data about the riparian and edaphohygrophilous forests of Salix atrocinerea and Corylus avellana of the Autonomic Community of Cantabria (N of Spain) are aported, in relation with the associations Hyperico androsaemi-Salicetum atrocinereae and Carici lusitanicae-Salicetum atrocinereae
Observaciones sobre algunos caracteres de valor taxonómico en el grupo de los carófitos
1990
The variability of the microstructurals characters and mineralogical composition of the oogonia of some charophytes extant and fossils is described. Two types of microstructures (W & V) are find. These are conservative into populations and are not able to change by the environmental factors. Moreover, these structures are quite constant in some of the phylogenetics groups studied. Consequently it is proposed its utilization in taxonomy. The apparition of original compounds in the Charophyta (vaterite. whewelite, aragonite, etc.) is important because it supports an old idea that considerates the Charophyta as an autonomous class between the Clorophyta and the Traqueophyta.<br><b…