Search results for "Lep"
showing 10 items of 3622 documents
Impact of the synergistic collaboration of oligothiophene bridges and ruthenium complexes on the optical properties of dumbbell-shaped compounds.
2012
The linear and non-linear optical properties of a family of dumbbell-shaped dinuclear complexes, in which an oligothiophene chain with various numbers of rings (1, 3, and 6) acts as a bridge between two homoleptic tris(2,2'-bipyridine)ruthenium(II) complexes, have been fully investigated by using a range of spectroscopic techniques (absorption and luminescence, transient absorption, Raman, and non-linear absorption), together with density functional theory calculations. Our results shed light on the impact of the synergistic collaboration between the electronic structures of the two chemical moieties on the optical properties of these materials. Experiments on the linear optical properties …
Quality characteristics of horchata (a Spanish vegetable beverage) treated with pulsed electric fields during shelf-life
2005
Abstract The application of pulsed electric fields (PEF) is one of the new non-thermal technologies being studied to evaluate their potential as alternative or complementary processes to thermal pasteurization. “Horchata de chufa” (tiger nut milk or earth almond milk) is of high nutritional quality and therefore has great potential in the food market, limited by its very short shelf-life. The present work studies whether PEF can be used to obtain a quality horchata and increase its shelf-life while maintaining its organoleptic characteristics. In order to do so we determined pH, total fat, peroxide index, thiobarbituric acid-reactive substances index, formol index, and peroxidase activity i…
Asymmetric and Symmetric Dicopper(II) Paddle-Wheel Units with Modified Nucleobases
2015
New copper(II) paddle-wheel complexes with different modified nucleobases and simple molecules in the axial positions have been prepared by direct reactions between copper(II) salts and the corresponding uracil- or thymine-1-acetic acids under inert atmosphere to produce the two homoleptic complexes, [Cu2(μ-OOCCH2-T)4(G)2] and [Cu2(μ-OOCCH2-U)4(G)2], and the heteroleptic one [Cu2(μ-OOCCH2-T)2(μ-OOCCH2-U)2(G)2] (where OOCCH2-T = thymine-1-acetate, OOCCH2-U = uracil-1-acetate, and G = dimethylformamide, water, dimethylacetamide, or dimethyl sulfoxide). Interestingly, the crystal structures of this family of closely related molecules present significant differences in their supramolecular arra…
Internalizing symptoms in children affected by childhood absence epilepsy: A preliminary study
2016
Introduction: Childhood absence epilepsy (CAE) is a common type of pediatric idiopathic generalized epilepsy, characterized by multiple seizures of typical absence, with typical EEG pattern consisting in bilateral synchronous and symmetrical discharges of generalized 3 Hz spike-wave (SWDs). Recently, some researchers have suggested that the underlying epileptogenic mechanism of absence seizures selectively involves the frontal cortical circuits, also supported by video-electroencephalography data(3). These data may be considered as a new window in CAE comprehension and management, particularly about symptoms different from seizure that children affected may present. In this light, aim of th…
Phylogeny of long-tailed tits and allies inferred from mitochondrial and nuclear markers (Aves: Passeriformes, Aegithalidae)
2010
Abstract In this paper we provide a molecular phylogeny based on three mitochondrial and three nuclear markers for all long-tailed tit species of the genus Aegithalos including several doubtful subspecies (17 taxa) plus three close allies of SE Asian Leptopoecile and North American Psaltriparus . Genus Aegithalos is divided into three major clades, two of them showing only minor differentiation. Separation of two mitchondrial haploytpe clusters in the N Palearctic Long-tailed Tit, Ae. caudatus , was dated back to the Late Pleistocene, however, descendants from both lineages underwent a rapid post-Pleistocene range expansion and largely mixed over the entire distribution area. The Chinese po…
Anomalous non-leptonic kaon decays
1992
8 páginas, 1 figura.
Optically Detected Magnetic Resonance of Chlorophyll Triplet States in Water-Soluble Chlorophyll Proteins from Lepidium virginicum: Evidence for Exci…
2018
Optically detected magnetic resonance of triplet states populated by photoexcitation in water-soluble chlorophyll proteins (WSCPs) from Lepidium virginicum has been performed using both absorption and fluorescence detection. Well resolved triplet-singlet (T-S) spectra have been obtained and interpreted in terms of electronic interactions among the four chlorophylls (Chls), forming two dimers in the WSCP tetramer. Localization of the triplet state on a single Chl leads to a redistribution of the oscillator strength in the remaining three Chls of the complex. By comparing the spectra with those obtained on a substoichiometric WSCP complex containing only 2 Chls per protein tetramer, we proved…
Ketogenic diet as antiepileptic therapy: Historical perspective
2017
Ketogenic diet (KD) is a high-lipid diet, adequate for protein content but low in carbohydrates content. Caloric intake is calculated on the basis of the ideal patient's needs, reduced by about 20%, and is about 90% of lipids present in 3: 1 or 4: 1 ratio with proteins and carbohydrates. KD is considered the most ancient antiepileptic therapy, actually proposed also for migraine therapy.
Ketogenic diet as antiepileptic therapy: Administration and formulas
2017
In 1921 Wilder defined classical cholesterol diet providing the patient with a daily calorie intake of less than 20% compared to age-related requirements. The main macronutrient is represented by saturated and long chain unsaturated fatty acids, in the ratio of 4: 1 to carbohydrates and proteins (4 grams of lipids per gram of carbohydrates and proteins). One of the first therapeutic protocols proposed is that of John Hopkins that the onset of the diet should take place in a hospital environment to assess the patient's response in a controlled situation.
Production of sulfur flavors by ten strains of Geotrichum candidum
1999
ABSTRACT Ten strains of Geotrichum candidum were studied on a liquid cheese model medium for the production of sulfur compounds which contribute to the aroma of cheeses. The volatile components produced by each cultured strain were extracted by dynamic headspace extractions, separated and quantified by gas chromatography (GC), and identified by GC-mass spectrometry. It was shown that four strains of this microorganism produced significant quantities of S -methyl thioacetate, S -methyl thiopropionate, S -methyl thiobutanoate, S -methyl thio iso butanoate, S -methyl thio iso valerate, and S -methyl thiohexanoate. This is the first example of the production of these compounds by a fungus. In a…