Search results for "ASTER"
showing 10 items of 2223 documents
A Protein Nuclear Extract fromD. melanogasterLarval Tissues
2008
Preparation of protein nuclear extracts is often the first step to study in vitro biological processes occurring in the nucleus of the eukaryotic cell. Nuclear extracts have been extensively used in different model organisms to identify and study protein function in nuclei. Drosophila embryos can be collected in large quantities and have been the source of choice for the production of protein nuclear extracts. However, most of Drosophila in vivo studies on protein function are conducted in larval tissues. Here we report a new method to produce highly stable large-scale protein nuclear extracts from whole Drosophila larvae that are suited for a variety of biochemical analyses.
Composition of the essential oil from flowerheads of Chrysanthemum coronarium L. (Asteraceae) wild growing in Southern Italy
2004
The essential oils from the aerial parts of Chrysanthemum coronarium L. (Asteraceae) growing wild in two different localities of Southern Italy, Lascari (L) and Palinuro (P), were obtained by hydrodistillation in a 0.13–0.16% yield. The oils were analysed by GC and GC–MS; 68 constituents, amounting to 89.0% of the oil (L), and 43 constituents, amounting to 91.6% of the oil (P), were identified. The trans‐spiroketal–enol ether 2‐(2,4‐hexadiynylidene)‐1,6‐dioxaspiro[4,4]non‐3‐ene (trans‐tonghaosu) with chrysanthenyl and lyratyl esters and camphor were the main components of the oils.
Composition and antimicrobial activity of the essential oil of Achillea falcata L. (Asteraceae).
2005
The composition of the essential oil from aerial parts of Achillea falcata L. (Asteraceae) growing wild in Lebanon was analysed by GC and GC–MS; 58 compounds, representing 94.4% of the oil, were identified. Isomers of the cyclobutane ethanol, 1-methyl-2-(1-methylethenyl), grandisol (21.4%) and fragranol (16.8%) were the main components of the oil. Also abundant were artemisia ketone (5.2%), terpinen-4-ol (4.5%) and 1,8-cineole (4.0%). The essential oil shows inhibitory activity mainly against Gram-positive bacteria.
Volatile components of Centaurea calcitrapa L. and Centaurea sphaerocephala L. ssp. sphaerocephala, two Asteraceae growing wild in Sicily
2006
The volatile components of the flowerheads of Centaurea calcitrapa L. (C.c.) and Centaurea sphaerocephala L. ssp. sphaerocephala (C.s.) were obtained by hydrodistillation and identified by GC and GC–MS. Altogether 96 components were identified, 66 in C. calcitrapa and 68 in C. spaerocephala, mostly fatty acids (32.8%, C.c. and 44.2%, C.s.) and hydrocarbons (32.3%, C.c. and 15.9%, C.s.). 9,12-Octadecadienoic acid (15.8%, C.c.) and hexadecanoic acid (30.7%, C.s.) were the most abundant fatty acids; tricosane (8.0%, C.c.) and heptacosane (4.9%, C.s.) were the main hydrocarbons. Sesquiterpenes were also present as hydrocarbons (10.1% for 14 components in C.c. and 9.2% for 13 components in C.s.)…
Bar-sur-Aube (Aube). 13 rue Beugnot et 2, 4, 10 rue du Prieuré [notice archéologique]
2019
Un projet immobilier de réhabilitation de l’îlot du prieuré Saint-Pierre (dépendance de l’abbaye Saint-Claude dans le Jura), accolé à l’église éponyme, au NO de la ville ancienne de Bar-sur-Aube, a entraîné la prescription d’un diagnostic archéologique sur les deux « cours » concernées par le projet et sur une analyse du potentiel archéologique conservé en élévation. Ce diagnostic a montré d’importants aménagements médiévaux encore conservés au sein du prieuré Saint-Pierre dont la création est antérieure au milieu du XIIe s., tant dans les élévations que dans les données stratigraphiques. Bien que les remaniements modernes et contemporains soient conséquents, et caractéristiques d’une opéra…
Mycorrhizal symbiosis changes host nitrogen source use
2021
Abstract Purpose The ecological importance of arbuscular mycorrhizal fungi (AMF) in plant acquisition of inorganic and organic sources of nitrogen (N) is not clear. To improve understanding of the plant N nutrition ecology, we tested the effect of intraspecific competition and AMF in plant N source use in growth and N acquisition. Methods Solidago virgaurea was grown in microcosms in a fully factorial experiment under greenhouse conditions. The factors tested were intraspecific competition between seedlings and adult plants (yes, no), N source (NH4, glycine) and AMF (inoculated with Glomus hoi, not inoculated). Results When grown separately, non-mycorrhizal seedling growth was highest when …
Design, Construction, and Characterization of a New Regioisomer and Diastereomer Material Based on the Spirooxindole Scaffold Incorporating a Sulphon…
2020
The 1,3-dipolar cycloaddition reaction is one of the most rapid, and efficient protocols to access, and construct highly divergent heterocycle chiral auxiliaries. Free catalyst synthesis of spirooxindole scaffold incorporating sulphone moiety via one pot&ndash
Piccole meraviglie in alabastro, avorio e corallo: nuove aggiunte alle arti decorative siciliane a Malta
2017
L’articolo tratta di alcune inedite opere d’arte decorativa in alabastro, avorio e corallo di collezione privata maltese che, per motivi sia tecnici che stilistico-compositivi, possono riconoscersi come manufatti trapanesi del XVIII secolo. The article deals with some unpublished alabaster, ivory and coral decorative arts kept in a Maltese private collection that, for technical and stylistic-compositional reasons, can be recognized as 18th century artifacts from Trapani.
Análisis espectroscópico de fragmentos cometarios y asteroidales a su entrada en la atmósfera terrestre.
2002
En la presente tesis se analiza el origen y composición de la materia interplanetaria a partir de una perspectiva nueva basada en el estudio de los fenómenos luminosos que producen estas partículas a su entrada a la atmósfera terrestre, llamados meteoros. Estas partículas, procedentes mayoritariamente de la degradación de las superficies de cometas y asteroides, cuando se hayan en órbita solar se denominan genéricamente meteoroides. Dependiendo de la geometría del encuentro con la Tierra los meteoroides alcanzan la atmósfera a velocidades comprendidas en el rango de 11 a 73 km/s. A estas velocidades a alturas de entre 120 y 70 km. la densidad atmosférica es suficiente para que las colisione…
Dust environment of an airless object: A phase space study with kinetic models
2016
Abstract The study of dust above the lunar surface is important for both science and technology. Dust particles are electrically charged due to impact of the solar radiation and the solar wind plasma and, therefore, they affect the plasma above the lunar surface. Dust is also a health hazard for crewed missions because micron and sub-micron sized dust particles can be toxic and harmful to the human body. Dust also causes malfunctions in mechanical devices and is therefore a risk for spacecraft and instruments on the lunar surface. Properties of dust particles above the lunar surface are not fully known. However, it can be stated that their large surface area to volume ratio due to their irr…