1,721,159 research outputs found
Catalyst- and Additive-Free Electrochemical CO2 Fixation into Morita-Baylis-Hillman Acetates
Full text linkThe electrochemical carboxylation of Morita-Baylis-Hillman (MBH) acetates with CO2 is presented. The process proceeds in the absence of transition metal catalysts and relies on the cathodic reduction of MBH acetates to generate nucleophilic anions able to trap low-pressure CO2. Valuable succinate derivatives are obtained (20 examples) in high yields (up to 90%) and high functional group tolerance. A remarkable substrate controlled (electronic nature) regioselectivity of the transformation was documented along with a mechanistic rationale based on control experiments
Recovery of tomato bioactive compounds through a biocompatible and eco-sustainable new technology for the production of enriched "nutraceutical tomato products"
No full textThe increase of knowledge concerning the importance of nutrients in human health is creating more and more a new market for products containing biologically active compounds and leading to a redefinition of criteria for the development of new "green technologies" of separation and extraction of natural bioactive molecules. During the last years numerous research groups have studied the possibility to recover bioactive compounds from vegetables by-products and/or from their industrial processes. This paper is aimed to introduce an innovative process for the production of new tomato-based juice ("beta-juice") extract, naturally enriched with bioactive components (lycopene and polyphenols) improved from selected High Pigment (round square shape) tomato cultivars. Data concerning the enriched tomato juice obtained, showed that it could be easily employed both as source of natural antioxidants and colorant for the formulation of novel functional foods and/or as a concentrated bioactive additive for foods to extend their added-value; moreover, this method has proved to be in agreement with the emerging concepts of sustainability and recycle/reuse from industrial point of view. This technology involves a complete "eco-sustainable" extraction process that lead to concentrate and enhance the bioactive compounds which are normally found in processed products (e.g., pulp and puree). Further studies will be carried out in order to improve the application of this new "green technology" to all the other processing vegetable industrial residues
Re: Francesco Soria, Marco Moschini, David D'Andrea, et al. Comparative Effectiveness in Perioperative Outcomes of Robotic versus Open Radical Cystectomy: Results from a Multicenter Contemporary Retrospective Cohort Study. Eur Urol Focus 2020;6:1233–9
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Re: Malte W. Vetterlein, Jakob Klemm, Philipp Gild, et al. Improving Estimates of Perioperative Morbidity After Radical Cystectomy Using the European Association of Urology Quality Criteria for Standardized Reporting and Introducing the Comprehensive Complication Index. Eur Urol 2020;77:55–65
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Gold-catalyzed dearomatization reactions
Full text linkThe advent of homogenous gold catalysis has revolutionized the way of approaching organic synthesis providing new and desirable solutions for challenging chemical manipulations of unactivated unsaturated hydrocarbons. In the realm of aromatic compounds, dearomatization protocols have been emerging as valuable synthetic tools to densely functionalized polycyclic 3D-molecular scaffolds, starting from readily available 2D-aromatic congeners. Gold catalysis contributed substantially in expanding this scenario enabling the condensation of numerous electron-rich arenes with hydrocarbons, resulting in the partial or total dearomatization of the aryl fragment. An overview of the most recent findings in the field, organized by type of electrophilic partners, is hereby presented
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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