1,721,009 research outputs found
Clara E. Lida (Compiladora), España y el imperio de Maximiliano. Finanzas, diplomacia, cultura e inmigración
No full textMachuca Laura. Clara E. Lida (Compiladora), España y el imperio de Maximiliano. Finanzas, diplomacia, cultura e inmigración. In: Caravelle, n°78, 2002. pp. 272-274
Alicia Hernandez Chavez, México. Breve historia contemporánea
No full textMachuca Laura. Alicia Hernandez Chavez, México. Breve historia contemporánea. In: Caravelle, n°79, 2002. Paysanneries latino-américaines : mythes et réalités. Hommage à Romain Gaignard. pp. 312-314
Thomas A. Abercrombie, Pathways of Memory and Power. Ethnography and History Among an Andean People
No full textMachuca Laura. Thomas A. Abercrombie, Pathways of Memory and Power. Ethnography and History Among an Andean People. In: Caravelle, n°75, 2000. Nouveaux Brésils – Fin de siècle. pp. 230-232
Thomas A. Abercrombie, Pathways of Memory and Power. Ethnography and History Among an Andean People
No full textMachuca Laura. Thomas A. Abercrombie, Pathways of Memory and Power. Ethnography and History Among an Andean People. In: Caravelle, n°75, 2000. Nouveaux Brésils – Fin de siècle. pp. 230-232
María Alba Pastor, Crisis y recomposición social. Nueva España en el tránsito del siglo XVI al XVII
No full textMachuca Laura. María Alba Pastor, Crisis y recomposición social. Nueva España en el tránsito del siglo XVI al XVII. In: Caravelle, n°75, 2000. Nouveaux Brésils – Fin de siècle. pp. 203-205
Dominique Gresle-Pouligny, Un plan pour Mexico-Tenochtitlan. Les représentations de la cité et l'imaginaire européen (XVIe-XVIIIe siècles)
No full textMachuca Laura. Dominique Gresle-Pouligny, Un plan pour Mexico-Tenochtitlan. Les représentations de la cité et l'imaginaire européen (XVIe-XVIIIe siècles). In: Caravelle, n°78, 2002. pp. 259-261
Preparation of eco-friendly antifungals derived of N-acetylated gemini surfactants for use in the chrome tanning processes of skins and hides
No full textThe aim of this work was to compare two novel antifungal agents with 2-(thiocyanomethylthio)-benzothiazole (TCMTB). For this study, two gemini surfactants (3b and 3e) were efficiently synthesized and formulated. The antifungal potency of these compounds was tested and their effectiveness as leather preservatives during the chrome-tanning process was assessed using the environmental chamber test (ASTMD 3273-00 Standard) and wet-blue hides on a plate with culture medium (ASTM D 4576-08 Standard). Two strains were used to perform the study: Aspergillus niger ATCC 6275 and Penicillum citrinum ATCC 9849 3b and 3e showed the ability to preserve hides because of their antifungal activity present in chromium tanning specimens. Compound 3e was foundto be a more potent antifungal than compound 3b, but not as potent as TCMTB. This cationic gemini compound (3e) was less toxic than TCMTB for Daphnia magna as a biological model. This work is the result of a patent of invention registered in the patent offices from Argentina.Fil: Machuca, Laura Marcela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; Argentina. Universidad de la Cuenca del Plata. Secretaria de Politicas del Conocimiento. Instituto de Investigaciones Científicas (sede Goya); ArgentinaFil: Murguia, Marcelo Cesar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; Argentina. Universidad Nacional del Litoral. Facultad de Bioquimica y Ciencias Biologicas. Laboratorio de Química Aplicada.; Argentin
Going 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
Synthesis of novel antifungal gemini compounds derived from n-acetyl diethanolamines as leather preservatives
No full textFil: Machuca, Laura Marcela. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; Argentina.En el presente trabajo, se presenta el diseño sintético para la preparación de nuevas moléculas anfipáticas de la familia gemini con potencial actividad antifúngica para la aplicación en la conservación de cueros. El propósito de esta tesis es generar una nueva librería de antifúngicos diméricos de la familia gemini con capacidad bioactiva, con el propósito de contribuir al desarrollo de productos aplicables en la conservación de cueros y cuya composición química perjudique lo menos posible al medio ambiente. Dichos compuestos tienen como finalidad intentar reemplazar a los ya existentes o bien actuar como sinergisantes de los mismos, reduciendo la cantidad empleada habitualmente y contribuyendo de manera favorable con los seres vivos. El estudio de dichos compuestos constituye un área de investigación y desarrollo en expansión gracias a las excepcionales propiedades que presentan muchos de estos compuestos en disolución acuosa. Por ejemplo, concentraciones micelares críticas (CMC) menores a la de los surfactantes convencionales monoméricos, mejor desempeño en la disminución de la tensión superficial del agua y la propiedad de formar agregados con diferentes morfologías, entre otras.In this work, we present the design for the preparation of new synthetic amphipathic molecules of gemini family with potential antifungal activity for use in the conservation of leather. The purpose of this thesis is to create a new library of antifungal dimeric gemini family with bioactive capability, in order to contribute to the development of applicable products in the conservation of leather and chemical composition which minimizes adverse to the environment. These compounds are designed to try to replace existing ones or to act as sinergists of them, reducing the amount usually employed and contributing favorably with living things. The study of these compounds is an area of expanding research and development thanks to the unique properties exhibited by many of these compounds in aqueous solution. For example, critical micellar concentration (CMC) under the conventional monomeric surfactants, better performance in reducing the surface tension of water and the property of forming aggregates with different morphologies, among others.Universidad Nacional del LitoralConsejo Nacional de Investigaciones Científicas y Técnica
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