Search results for "COMPOSITION"
showing 10 items of 2675 documents
New complexes of nickel and nickel/cobalt with tetrahydrofuran-2,3,4,5-tetracarboxylic acid, THF(COOH)4. Crystal structures of Ni[THF(COOH)2(COOH)2](…
1993
Abstract The reaction of NiCl2·6H2O with tetrahydrofuran-2,3,4,5-tetracarboxylic acid, THF(COOH)4, partially deprotonated by Na2CO3 (1 : 1 metal/ligand molar ratio), yielded Ni[THF(COOH)2(COO)2](H2O)3 (1). The molecular structure of 1 was determined by X-ray diffraction on the monocrystal. The structure consists of a mononuclear neutral unit with the nickel atom coordinated by a [THF(COOH)2(COO)2]2− ligand, which acts as a tridentate ligand, and three water molecules. Direct interaction of NiCl2·6H2O and CoCl2·6H2O (1 : 1 molar ratio) with THF(COOH)4 previously deprotonated by Na2CO3 (1 : 1 metal/ligand molar ratio) gave, by slow evaporation of the solution obtained, green crystals of the n…
Light and Primary Production Shape Bacterial Activity and Community Composition of Aerobic Anoxygenic Phototrophic Bacteria in a Microcosm Experiment
2020
ABSTRACT Phytoplankton is a key component of aquatic microbial communities, and metabolic coupling between phytoplankton and bacteria determines the fate of dissolved organic carbon (DOC). Yet, the impact of primary production on bacterial activity and community composition remains largely unknown, as, for example, in the case of aerobic anoxygenic phototrophic (AAP) bacteria that utilize both phytoplankton-derived DOC and light as energy sources. Here, we studied how reduction of primary production in a natural freshwater community affects the bacterial community composition and its activity, focusing primarily on AAP bacteria. The bacterial respiration rate was the lowest when photosynthe…
Effects of high power ultrasound treatments on the phenolic, chromatic and aroma composition of young and aged red wine
2019
Abstract In this study, the effects of both ultrasonic bath and probe treatments on the phenolic, chromatic and aroma composition of young red wine Cabernet Sauvignon were studied and modeled by artificial neural networks (ANNs). Moreover, the effect of high power ultrasound (HPU) along with antioxidants addition (sulfur dioxide and glutathione) was investigated during 6 months of aging in bottles. Lower amplitude and temperature, shorter treatment duration and particularly lower frequency showed a more favorable and milder effect on the chemical composition of wine. In the case of the ultrasonic probe treatment, similar effect was achieved primarily by a larger probe diameter as well as lo…
Chemical Composition of the Essential Oil ofAnethum graveolensAerial Parts
2014
Abstract:The chemical composition of the essential oil obtained by hydrodistillation method from the aerial parts of Anethum graveolens were analysed by GC-MS. Twelve compounds constituting 96.8 % of the oil were identified. The main compounds were α-phellandrene (31.8 %), apiole (15.3 %), dill ether (13.2 %), limonene (11.8 %), geraniol (10.6 %) and pcymene (5.3 %). The chemical composition of the oil was found to be similar as reported from India and abroad, however there was a considerable quantitative variation among the major compounds identified.
Composition of the Essential Oil ofDictamnus hispanicusfrom Spain
2006
The composition of the essential oil of Dictamnus hispanicus Webb ex. Willk. collected in eastern Spain was analyzed by GC and GC/MS. The main constituents identified were methyl chavicol (79%) and limonene (7%). The high oil yield (72.0% fresh plant material) and the proportion of the main compounds support the consideration of D. hispanicus as a separate species of the S. and CS. Europe as D. albus aggregate or as a new chemotype of the polymorphic D. albus.
Chemical constituents of the volatile oil of Murraya koenigii leaves
2004
Abstract The chemical composition of the volatile oil of the fresh leaves of Murraya koenigii growing wild in Dehra Dun was analyzed by gas chromatography-mass spectrometry. Thirty-four compounds consisting of 97.4% of the oil were identified. The major constituents identified were α-pinene (51.7%), sabinene (10.5%), β-pinene (9.8%), β-caryophyllene (5.5%), limonene (5.4%), bornyl acetate (1.8%), terpinen-4-ol (1.3%), γ-terpinene (1.2%) and α-humulene (1.2%).
Linear dynamics induced by odometers
2022
Weighted shifts are an important concrete class of operators in linear dynamics. In particular, they are an essential tool in distinguishing variety dynamical properties. Recently, a systematic study of dynamical properties of composition operators on $L^p$ spaces has been initiated. This class of operators includes weighted shifts and also allows flexibility in construction of other concrete examples. In this article, we study one such concrete class of operators, namely composition operators induced by measures on odometers. In particular, we study measures on odometers which induce mixing and transitive linear operators on $L^p$ spaces.
Unbounded Linear Operators in Hilbert Spaces
2002
In order to make this monograph self-contained, we summarize in this chapter some basic definitions and results for unbounded linear operators in a Hilbert space. In Section 1.1, we recall the definitions of C*-algebras and von Neumann algebras. In Section 1.2, we define and investigate the notion of closedness, the closure and the adjoint of an unbounded linear operator in a Hilbert space. Section 1.3 is devoted to the Cayley transform approach to the self-adjointness of a symmetric operator. Section 1.4 deals with the self-adjoint extendability of a symmetric operator with help of the deficiency spaces. In Section 1.5, we extend to unbounded self-adjoint operators the spectral theorem and…
“Should she really be covered by her own subtitle?”
2016
This article provides a first concept of typographic identity in film and the impact of audiovisual translation on it. Based on an analysis of 52 films, relevant text elements and their graphical translation strategies in film were identified. Finally, possible shortcomings and challenges such as collisions and the impact on a film’s typographic identity and image composition are discussed as a first basis for further studies
Some notes to the language of two late byzantine poems
2019
Los poemas bizantinos titulados Συναξάριον τοῦ τιμημένου γαδάρου y Γαδάρου, λύκου κι ἀλουποὺς διήγησις ὡραία ofrecen un ejemplo significativo y claro de la interacción entre dos variedades lingüísticas opuestas: de un lado, el griego literario empleado para la composición poética; de otro, el griego popular que iba poco a poco ganando terreno con vistas a reemplazar a la lengua antigua.