45,063 research outputs found
A monoclinic modification of propane-1,3-diyl bis(pyridine-3-carboxylate)
No full textIn the title compound, C15H14N2O4, (I), the molecule lies on a twofold rotation axis which passes through the central C atom of the aliphatic chain, giving one half-molecule per asymmetric unit. The structure is a monoclinic polymorph of the triclinic structure previously reported [Brito, Vallejos, Bolte & López-Rodríguez (2010). Acta Cryst. E66, o792], (II). The most obvious difference between them is the O/C/C/C—O/C/C/C torsion angle [58.2 (7)° in (I) and 173.4 (3)/70.2 (3)° in (II) for GG and TG conformations, respectively]. Another important difference is observed in the dihedral angle between the planes of the aromatic rings [86.49 (7)° for (I) and 76.4 (3)° for (II)]. The crystal structure features a weak pi–pi interaction [centroid–centroid distance = 4.1397 (10)Å]; this latter kind of interaction is not evident in the triclinic polymorph
Phyllocnistis selene Brito & Moreira 2017
No full textPhyllocnistis selene Brito & Moreira, 2017 Figs. 3V, 4V, 5, S1; Tab. 2 Phyllocnistis selene; Brito & Moreira 2017: figs. 2C, F, 3G–I, 14–18. Type material. Description of Phyllocnistis selene Brito & Moreira, 2017 was based on five specimens from the Centro de Pesquisas e Conservação da Natureza Pró-Mata (CPCN Pró-Mata) São Francisco de Paula municipality, Brazil. The male holotype is deposited at DZUP and has the following labels (separated by forward slash symbols, Fig. 4V): / Phyllocnistis selene Brito & Moreira HOLOTYPE #m / 236–22 Brasil, RS Promata 0 7.03.2014 GRPMoreira&RBrito #m / DZ 33.403 /. The holotype genitalia is slide-mounted in Canada balsam (GRPM 50– 121). According to the original description, the paratypes are as follows: one male (LMCI 263–18) with genitalia on slide (GRPM 50–122) and one female (LMCI 210–34), deposited at DZUP (33.413, 33.423, respectively); another male (LMCI 263–26) with genitalia on slide (GRPM 50–123) and one female (LMCI 263–28) are deposited at MCTP (57.620 and 57.621, respectively). Forewing length. 2.15 mm (n=2). Diagnosis (Figs. 3V, S 1; Tab. 2). Dorsal forewing: ground color light gray. lf thin, light brown, without borders, emerging from the base of costal margin and running straight to center, connecting to fused tf 1 –tf 2. Transversal fasciae light yellow with light brown borders. tf 1 short, restricted to costal section. tf 2 crossing the wing entirely, merged with tf 1. At distal region (III), a light yellow blotch formed by fusion of tf 3 + tf 4. At the center of this blotch there is another small black blotch. As preceded by a light gray stripe. Costal and apical strigulae typical. The shape of lf, in association with pattern of corresponding fusion with tf 1+ tf 2 are unique for this species compared to other Neotropical Phyllocnistis. Geographical distribution (Fig. 5). Records are restricted to type locality, in São Francisco de Paula municipality, Rio Grande do Sul state, Brazil, at 900 m of altitude. Natural history. According to the original description, mines are transparent, serpentine shaped and usually followed by a brown trail of feces. Initially they are thin, increasing in width along larval ontogenesis, and corresponding paths may cross each other forming blotches. The mines are found on the abaxial and adaxial leaf surfaces. The egg is deposited next to the petiole, and usually only one larva feeds per leaf. The cocoon is covered with silk, constructed at the border of the leaf, provoking a leaf wrinkling. Larvae were found in the field in the months of March and April, suggesting that this species is active as leaf mining during late summer and early autumn. Host plant(s). Drimys angustifolia Miers (Winteraceae). Examined material. Holotype male and one specimen, with no sex identified. Brazil: Rio Grande do Sul - São Francisco de Paula (Centro de Pesquisas e Conservação da Natureza—Pró-mata), 900 m, 07.III.2014, G.R.P. Moreira & R. Brito legs., 1 male (DZ 33.403) (DZUP); 04-06.IV.2014, G.R.P. Moreira & R. Brito legs., 1 specimen (LMCI 263.21) (LMCI). Remarks. In the original description, additional diagnostic characters are provided for this species, such the absence of signum on the female genitalia, the acute, hook shaped cocoon-cutter and two pairs of strong tergal spines facing towards the lateral region of the body on the pupal abdominal segments.Published as part of Brito, Rosângela, Lopez-Vaamonde, Carlos, Gonçalves, Gislene L., Becker, Vitor O., Mielke, Olaf H. H. & Moreira, Gilson R. P., 2017, Taxonomic revision of Neotropical Phyllocnistis Zeller, 1848 (Lepidoptera: Gracillariidae), with descriptions of seven new species and host plant associations, pp. 301-352 in Zootaxa 4341 (3) on pages 324-325, DOI: 10.11646/zootaxa.4341.3.1, http://zenodo.org/record/104000
Vanneaugobius canariensis Van Tassell, Miller and Brito 1988
No full textVanneaugobius canariensis Van Tassell, Miller and Brito, 1988 Material. Cape Verdes: 1,l 23.5 1 6.0 mm and 2 mm, 20.5 1 4.5 and 22.0 1 6.0 mm, Ilha da Boa Vista, 7 October 1998; 1 m, 22.0 1 6.0; and 2 juveniles, 16.5 1 4.0 and 18.0 1 5.0 mm, all Ilheu de Sal Rei, 7 October 1998; 4 juveniles, 13.0 1 3.0 to 20.0 1 4.0 mm, 8 October 1998; 4, 14 1 d to 20.5 1 5.5 mm, Sta Maria, Ilha do Sal, 8 October 1998. Generic and speci W c identi W cation. These specimens from the Cape Verdes correspond in diagnostic features to the original description of this species by Van Tassell et al. (1988), based on material from the Canaries and Guinea. Their meristic features are D1 VI, D2 I /10 (10±11), A I /9, P 18 (17±18), and LL 24±27. Biology. At the Cape Verdes localities, the species was collected in 11±16 m on mixed substrata of sand, stones, calcareous algae, and rock, within a depth range of 9±45 m noted elsewhere (Van Tassell et al., 1988). The ®nding of V. canariensis at the Cape Verdes supports the suggestion by Van Tassell et al. (1988) that this is a tropical species whose northern limit of distribution now appears to be at Madeira (Debelius, 1998).Published as part of Brito, A. & Miller, P. J., 2001, Gobiid ® shes from the Cape Verde Islands, including two new species of Gobius (Teleostei: Gobioidei), pp. 253-277 in Journal of Natural History 35 (2) on pages 274-275, DOI: 10.1080/00222930150215399, http://zenodo.org/record/527604
Rational design of hierarchical porous Cu/SAPO-34 obtained with sustainable templates
No full textA simple procedure was developed to synthesize hierarchical Cu exchanged SAPO-34 material by bottom-up method. To induce two levels of porosity (micro and mesoporosity) in SAPO-34, traditional tetraethylammonium hydroxide (TEAOH) to address the micropores formation and sucrose, a low-cost and green mesoporogen to address the mesopore formation, have been used. The Si loading was also modulated to achieve hierarchical SAPO-34 with a high concentration of Bronsted acid sites that are the locus of the exchange with Cu ions. The exchange method to introduce Cu in chabazite (CHA) architecture was deeply investigated to reduce the number of post-synthetic steps and to obtain a hierarchical Cu/SAPO-34 catalyst with Cu(II) sites stabilized in the 6membered ring (6 MR) available to perform selective catalytic reduction of NOx with NH3 (NH3-SCR). Physico-chemical characterization was performed by using structural and spectroscopic techniques to elucidate the properties of hierarchical SAPO-34 before and after Cu introduction
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Contribuições à análise de lajes nervuradas por analogia de grelha
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Civil.Este trabalho aborda aspectos da análise elástico-linear de lajes nervuradas de concreto armado através do modelo de analogia de grelha, o qual apresenta algumas vantagens em relação a outros métodos numéricos. São abordados alguns parâmetros que podem influenciar os resultados das análises, dando ênfase ao estudo do coeficiente de rigidez à torção, no modelo de analogia de grelha, e ao espaçamento entre nervuras da laje nervurada. Os resultados obtidos pelo modelo de analogia de grelha são comparados com os resultados obtidos calculando a laje nervurada como placa pela teoria da elasticidade, conforme permite a NBR-6118/78, e com o modelo tridimensional em elementos finitos. São apresentados exemplos de lajes quadradas e retangulares, com diferentes espaçamentos entre nervuras e diversas condições de apoio, inclusive considerações das lajes apoiadas em bordos indeslocáveis ou em vigas
Spinivalva gaucha Moreira
No full text<i>Spinivalva gaucha</i> Moreira & Vargas, 2013 <p> " <i>Spinivalva gaucha</i> Moreira & Vargas, sp. n."—Brito, R., Gonçalves, G.L., Vargas, H.A., Moreira, G.R.P.</p> <p> 2013. <i>ZooKeys</i> 291: 10–22, figs. 1–12.</p> <p> Type locality: Brazil, Rio Grande do Sul State, São Francisco de Paula Municipality, Condomínio Alpes, de São Francisco, 29°27'9.2"S 50°37'6.6"W, e.l. <i>Passiflora actinia</i> 19.xii.2012, leg. G.R.P. Moreira, R. Brito & F.A. Luz.</p> <p> Type specimens: Holotype ♂, DZUP; Paratypes 2♂, 3♀, DZUP, MCNZ, MCTP. Distribution: Brazil (Brito <i>et al</i>. 2013: 10).</p> <p> Larval hostplant(s): Passifloraceae: <i>Passiflora actinia</i> Hook, <i>P. misera</i> Kunth., <i>P. suberosa</i> L. (Brito, R. <i>et</i></p> <p> <i>al</i>. 2013: 10).</p> <p> DNA: BOLD GBGL13506-14, GBGL13507-14; Genbank KC512114; KC512123 (Brito <i>et al</i>. 2013).</p>Published as part of <i>Prins, Jurate De, Brito, Rosângela & Moreira, Gilson Rudinei Pires, 2016, An annotated taxonomic checklist of the Neotropical Gracillariidae (Lepidoptera) with links to the information on host plants and parasitoids, pp. 1-51 in Zootaxa 4158 (1)</i> on page 32, DOI: 10.11646/zootaxa.4158.1.1, <a href="http://zenodo.org/record/255480">http://zenodo.org/record/255480</a>
Les biblioteques universitàries i el suport a la recerca
No full textThe European Higher Education Area and the European Research Area are currently two key objectives for university learning, teaching and research in all European universities. University libraries must meet the challenges by offering the best library services to the academic community. In drafting the second strategic plan, Rebiun (Network of University Libraries) gathered comments and suggestions from professionals in Spanish university libraries. This article presents the reflections and suggestions contributed by the author regarding the support services that university libraries could offer for university research.L'espai europeu d'educació superior i l'espai europeu d'investigació són actualment dos objectius clau per a l'aprenentatge, la docència i la recerca de totes les universitats europees. Les biblioteques universitàries han de contribuir a aquests reptes, oferint els millors serveis bibliotecaris a la comunitat acadèmica. En la fase d'elaboració del seu segon Pla estratègic, la REBIUN (Red de Bibliotecas Universtarias) va recollir reflexions i suggeriments de diferents professionals de les biblioteques universitàries de l'Estat espanyol. En l¿article següent es presenten les reflexions i els suggeriments aportats per l'autora sobre el suport que les biblioteques universitàries poden oferir a la recerca universitària
Letter from Carl Hayden to L. L. Ferrall, Postmaster at Grand Canyon
No full textLetter from Carl Hayden to L. L. Ferrall on the favorable conditions for creating a national park and the prospect of the United States entering WW I
The synthesis of monodisperse alkanes with long chains
No full textThis thesis discusses reasons for the interest in monodisperse long chain alkanes and describes attempts, past and present, to synthesise such molecules. Chapter 1 discusses why the synthesis of such molecules are important and the objectives of this project. Chapter 2 reviews the methods previous groups have devised to prepare pure samples of long chain alkanes. In particular, work carried out by Whiting et al. at Bristol, whose scheme formed the basis of the early work in Durham. Chapter 3 describes the work in Durham and improvements which were made to Whiting's method, allowing the synthesis of longer chain lengths and greater quantities of materials to be achieved. Chapter 4 provides a summary of the practical work carried out by the author. Chapter 5 gives experimental details of the work described in Chapter 4
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