Results 21 to 30 of about 498,968 (231)

Effect of Reaction Time and Temperature on the Impurity Profile of Amphetamine in the Leuckart Method

open access: yesDrug Testing and Analysis, EarlyView.
This study investigates the effect of the reaction temperature (step 1) and reaction time (step 1 and 2) on the conversion efficiency and impurity profile of amphetamine synthesized via the Leuckart method. Conversion efficiency and impurity profile were assessed using gas chromatography–flame ionization detection (GC–FID) and GC–mass spectrometry (GC ...
Maartje C. M. Verhoeven   +7 more
wiley   +1 more source

Cartografia cognitiva: mapeando conhecimento e organizando rede de informação na Internet [PDF]

open access: yes, 2003
O objetivo deste trabalho é discutir como webmaps (mapas na Internet) podem ser utilizados para propiciar a construção do conhecimento e organizar redes de informações na Internet.
Okada, Alexandra Lilavati Pereira
core  

By‐product of heparin extraction as a sustainable alternative to enhance the use of nitrogen in agriculture

open access: yesEnvironmental Progress &Sustainable Energy, EarlyView.
Abstract This study evaluates the potential of a new organic fertilizer derived from porcine intestinal mucosa (designated BHE), a by‐product of the heparin extraction process, as a sustainable nitrogen (N) source for agriculture. The work was conducted in two stages: (i) chemical and spectroscopic characterization of BHE compared with poultry litter ...
Aline Zanquetti   +3 more
wiley   +1 more source

Ciudad, teatro, mapas [PDF]

open access: yes, 2009
El presente articulo se centra en el estudio de las relaciones analogicas establecidas entre la ciudad y el cosmos o el mundo en diversos textos del Siglo de Oro, mediante la comparacion del plano urbano con un mapamundi.
Alonso Miguel, Álvaro
core   +1 more source

Wheat flour particle size: Influence of mill design and effects on quality and performance

open access: yesJSFA reports, EarlyView.
Abstract Among the various characteristics of wheat (Triticum aestivum) flour, particle size is of paramount importance globally. The industrial process of separating the three main components (endosperm, bran, and germ) must ensure that the desired quality is delivered to customers through a progressive reduction in the size of the endosperm until the
Ricardo Barroso Lopes   +3 more
wiley   +1 more source

Expanding the Faunal Interpretation of the Cova Eirós (NW Iberia) Middle Paleolithic–Early Upper Paleolithic Record With ZooMS

open access: yesInternational Journal of Osteoarchaeology, EarlyView.
ABSTRACT The Cova Eirós archaeopaleontological site preserves the most comprehensive archaeostratigraphic sequence in the northwestern Iberian Peninsula, with an exceptionally rich record spanning from the Mousterian to the Upper Paleolithic. The extensive fragmentation of the faunal record and the rich taxonomic diversity at this site have limited the
Hugo Bal‐García   +9 more
wiley   +1 more source

La recuperación de símbolos del Siglo de Oro en la obra de Jorge Luis Borges

open access: yesPensamiento. Revista de Investigación e Información Filosófica, 2022
La obra de Jorge Luis Borges (1899-1986) siempre suele relacionarse con la de autores ajenos a la literatura española como De Quincey, Stevenson, Whitman, Chesterton, Coleridge o Poe. Su anglofilia es bien conocida por todos.
Miguel Antón Moreno
doaj   +1 more source

Mapas Conceptuales y Mapas Mentales: Composición, Funciones y Principios de Calidad [PDF]

open access: yes, 2010
A concept map or a mental map (as of now, we'll use the first as a unifying term) is a class diagram that tries to represent graphically a conceptual system components as well as relations between them.
Codina, Lluís
core  

Ancient Cartographies as a Basis for Geolocation Models in Public Space: The Case of Giambattista Nolli and its Heritage Application [PDF]

open access: yes, 2019
In 1748, the architect and surveyor Giambattista Nolli mapped an abstract reality of the city of Rome. As a challenge to the inherited projections, it represented the city mixing streets, halls, corridors, churches, baths and markets as part of a unique ...
Cubero Hernández, Antonio   +2 more
core   +1 more source

More pumas (Puma concolor) does not change perceptions: The mismatched response of ranchers to the presence of a top carnivore

open access: yesPeople and Nature, EarlyView.
Abstract Human‐wildlife conflicts (HWCs) are one of the most critical conservation challenges worldwide. Large carnivores are frequently at the centre of these conflicts because of the perceived and real threats they pose to livestock and human safety.
Esperanza C. Iranzo   +10 more
wiley   +1 more source

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