116,820 research outputs found
Falsas anomalías de la función valor actual neto
No full textLas anomalías que surgen en el cálculo y la interpretación del Valor Actual Neto (VAN) y la Tasa Interna de Rendimiento son fácilmente superables, teniendo en cuenta las propiedades reales del VAN y redefiniendo adecuadamente lo que es una inversión y un crédit
Spurostigma caatinga Neto & García, 2012, n. sp.
No full textSpurostigma caatinga n. sp. (Male) (Figs. 1–11) Color (in 80 % ethyl alcohol). Body yellowish brown. Compound eyes black, ocelli hyaline, with interommatidial setae and each with an ochre centripetal crescent (Fig. 1). Scape brown, pedicel pale yellow, flagellum pale yellow, f 1 –f 10 with distal ends white (Fig. 2); f 11 elongate, with a slender distal process (Fig. 3). Mx 1-2 creamy white, Mx 3 pale brown, Mx 4 dark brown. Thorax brown, pleura pale brown and abdomen yellowish brown. Legs: coxae, trochanters and femora whitish, tibiae and tarsomeres brown (Fig. 4); pretarsal claw slender, with a preapical denticle (Fig. 5). Forewings almost hyaline, as illustrated (Fig. 6), veins brown, ending in a brown spot at wing margin. Hindwing (Fig. 7), almost hyaline throughout, veins brown. Morphology. Forewing and hindwing Rs-M fused for a distance (Fig. 5). Lacinia broadening distally, outer cusp broad, with nine denticles (Fig. 8). Five distal labral sensilla, a central placoid, flanked by a pair trichoidplacoid. Hypandrium of two pieces, the distal one simple, broad, almost straight anteriorly and rounded posteriorly, setose as illustrated (Fig. 9). Phallosome (Fig. 10) simple, elongate, with a mid concavity anteriorly; endophallus indistinct, aedeagal arch slender, strongly sclerotized; external parameres long, stout, distally rounded. Paraprocts robust, almost semi-elliptic, with setae as illustrated (Fig. 11); sensory fields elliptic, with 34 trichobothria on basal rosettes. Epiproct broad, trapeziform, with setae as illustrated (Fig. 11). Measurements (in microns): FW: 2833, HW: 2012, F: 597, T: 995, t 1: 388, t 2: 121, cttl: 34, f 1: 314, f 2: 170, f 3: 166, f 4: 143, f 5: 117, f 6: 117, f 7: 101, f 8: 97, f 9: 86, f 10: 82, f 11: 83, IO: 382, D: 183, d: 116, IO/d: 3.29, PO: 0.64. Specimens studied. Holotype male, 1 paratype male. BRAZIL. Bahia. Milagres, 12 º 54`21.9 ”S: 39 º 50`46.7 ”W. Alt. 730m. 25.III. 2012. Beating branches of trees and shrubs with dead leaves, Silva-Neto, A. M. Etymology. The specific name refers to the caatinga biome, where the two specimens were collected.. Discussion. The 13 described species of Spurostigma are strictly neotropical and are found in three of the subregions established by Morrone (2001). Nine species occur in the Caribbean subregion: S. cuba Eertmoed, S. jimenezi Badonnel, (Cuba); S. dominica Eertmoed, S. insula Eertmoed, (Dominica); S. nesiotis Eertmoed, S. portoricense Eertmoed, (Puerto Rico); S. panamense Eertmoed, (Panama); S. epirotica Eertmoed, (Mexico). Two species have been recorded in the Amazonian subregion: S. guyana Eertmoed, (Guyana) and S. mesembria Eertmoed, (Suriname), and two species occur in the Chaco subregion: S. boliviana García Aldrete, and S. caatinga n. sp. (Brazil) (Fig. 12). S. caatinga is the first recorded for the caatinga province (a subdivision of the Chaco subregion, Morrone, 2001). S. caatinga belongs in Section B of García Aldrete (2009), characterized by having the forewing veins Rs- M fused for a distance or diverging from a point; in that section, it is similar to S. panamensis Eertmoed, from which it differs mostly on the structure of the phallosome. Figure 12 shows that both S. boliviana García Aldrete, and S. caatinga Silva-Neto & García Aldrete, are isolated from the presently known main area of distribution of the genus.Published as part of Neto, Alberto Moreira Da Silva & García, Alfonso N., 2012, A new species of Spurostigma Eertmoed (Psocodea: ' Psocoptera': Spurostigmatidae) from Brazil, pp. 83-87 in Zootaxa 3501 on page 86, DOI: 10.5281/zenodo.21032
Spurostigma caatinga Neto & García, 2012, n. sp.
No full textSpurostigma caatinga n. sp. (Male) (Figs. 1–11) Color (in 80 % ethyl alcohol). Body yellowish brown. Compound eyes black, ocelli hyaline, with interommatidial setae and each with an ochre centripetal crescent (Fig. 1). Scape brown, pedicel pale yellow, flagellum pale yellow, f 1 –f 10 with distal ends white (Fig. 2); f 11 elongate, with a slender distal process (Fig. 3). Mx 1-2 creamy white, Mx 3 pale brown, Mx 4 dark brown. Thorax brown, pleura pale brown and abdomen yellowish brown. Legs: coxae, trochanters and femora whitish, tibiae and tarsomeres brown (Fig. 4); pretarsal claw slender, with a preapical denticle (Fig. 5). Forewings almost hyaline, as illustrated (Fig. 6), veins brown, ending in a brown spot at wing margin. Hindwing (Fig. 7), almost hyaline throughout, veins brown. Morphology. Forewing and hindwing Rs-M fused for a distance (Fig. 5). Lacinia broadening distally, outer cusp broad, with nine denticles (Fig. 8). Five distal labral sensilla, a central placoid, flanked by a pair trichoidplacoid. Hypandrium of two pieces, the distal one simple, broad, almost straight anteriorly and rounded posteriorly, setose as illustrated (Fig. 9). Phallosome (Fig. 10) simple, elongate, with a mid concavity anteriorly; endophallus indistinct, aedeagal arch slender, strongly sclerotized; external parameres long, stout, distally rounded. Paraprocts robust, almost semi-elliptic, with setae as illustrated (Fig. 11); sensory fields elliptic, with 34 trichobothria on basal rosettes. Epiproct broad, trapeziform, with setae as illustrated (Fig. 11). Measurements (in microns): FW: 2833, HW: 2012, F: 597, T: 995, t 1: 388, t 2: 121, cttl: 34, f 1: 314, f 2: 170, f 3: 166, f 4: 143, f 5: 117, f 6: 117, f 7: 101, f 8: 97, f 9: 86, f 10: 82, f 11: 83, IO: 382, D: 183, d: 116, IO/d: 3.29, PO: 0.64. Specimens studied. Holotype male, 1 paratype male. BRAZIL. Bahia. Milagres, 12 º 54`21.9 ”S: 39 º 50`46.7 ”W. Alt. 730m. 25.III. 2012. Beating branches of trees and shrubs with dead leaves, Silva-Neto, A. M. Etymology. The specific name refers to the caatinga biome, where the two specimens were collected.. Discussion. The 13 described species of Spurostigma are strictly neotropical and are found in three of the subregions established by Morrone (2001). Nine species occur in the Caribbean subregion: S. cuba Eertmoed, S. jimenezi Badonnel, (Cuba); S. dominica Eertmoed, S. insula Eertmoed, (Dominica); S. nesiotis Eertmoed, S. portoricense Eertmoed, (Puerto Rico); S. panamense Eertmoed, (Panama); S. epirotica Eertmoed, (Mexico). Two species have been recorded in the Amazonian subregion: S. guyana Eertmoed, (Guyana) and S. mesembria Eertmoed, (Suriname), and two species occur in the Chaco subregion: S. boliviana García Aldrete, and S. caatinga n. sp. (Brazil) (Fig. 12). S. caatinga is the first recorded for the caatinga province (a subdivision of the Chaco subregion, Morrone, 2001). S. caatinga belongs in Section B of García Aldrete (2009), characterized by having the forewing veins Rs- M fused for a distance or diverging from a point; in that section, it is similar to S. panamensis Eertmoed, from which it differs mostly on the structure of the phallosome. Figure 12 shows that both S. boliviana García Aldrete, and S. caatinga Silva-Neto & García Aldrete, are isolated from the presently known main area of distribution of the genus.Published as part of Neto, Alberto Moreira Da Silva & García, Alfonso N., 2012, A new species of Spurostigma Eertmoed (Psocodea: ' Psocoptera': Spurostigmatidae) from Brazil, pp. 83-87 in Zootaxa 3501 on page 86, DOI: 10.5281/zenodo.21032
Brasineura Silva-Neto & Garcia Aldrete 2015
No full textBrasineura Silva-Neto & García Aldrete, 2015 jiboia Silva-Neto, García Aldrete & Rafael, 2018: 548, Figs 1 –15 Holotype: ♂, BRAZIL, Bahia: Santa Teresinha, (“ Serra da Jibóia, 12°46’S / 39°31’W ”), 26.ix.2001, light trap, Bravo. F & Castro. I. leg. Paratypes: 1 ♂, same data of holotype, except: 2.ii.2002. Castro. I.; 1 ♀, same data of holotype, except: 19.v.2001.Published as part of Ferreira, André Da Silva, Araújo, Maíra Xavier, Vilarinho, Naiara Thaís, Silva-Neto, Alberto Moreira Da & Bravo, Freddy, 2020, Catalogue of type specimens of Insecta (Arthropoda: Hexapoda) deposited in the entomological collection of the Museum of Zoology of Universidade Estadual de Feira de Santana, Brazil, pp. 501-546 in Zootaxa 4728 (4) on page 536, DOI: 10.11646/zootaxa.4728.4.10, http://zenodo.org/record/362654
Neto levels affect NMJ development and function.
No full text<p>(A) Confocal images of NMJ4 (segment A4) in third instar larvae of indicated genotypes labeled for Neto (green) and HRP (red). Excess Neto distributed in larger, more diffuse synaptic clusters or spread over the muscle. Bouton numbers were decreased at low Neto levels in the <i>neto<sup>109</sup></i> hypomorph or in RNAi knockdown (<i>24B>neto<sup>RNAi</sup></i>) (quantified in B). Excess Neto also induced smaller NMJs in a concentration-dependent manner in both rescue (<i>neto<sup>36</sup>/Y;G14>neto-Ai</i>) or overexpression (<i>G14>neto-A1</i>) settings. (C) Western blot comparison of Neto, GluRIIC and Tubulin levels in muscle extracts from <i>neto</i> null larvae rescued with various <i>neto</i> transgenes. Neto levels vary from low (<i>A9</i>) and moderate (<i>A3</i>) to high (<i>A1</i>). (*) processed Neto. (D-F) Electrophysiological recordings of control and <i>neto</i> loss-of-function and gain-of-function third instar larvae. The mEJPs frequency (D) and amplitude (E) as well as EJP amplitude (F) were reduced at NMJs with reduced or high levels of Neto. The numbers of NMJs examined are indicated in each bar. Error bars indicate SEM. *; <i>p</i><0.001, ***; <i>p</i><0.05. Bars: 10 μm.</p
Taiophlebia ferreirai Martins-Neto & Gallego & Brauckmann & Cruz 2007, comb. n.
No full textTaiophlebia ferreirai (Pinto, 1994), comb. n. Archaemegaptilus ferreirai Pinto, 1994: 107–108, fig. 1 (holotype BA-PB-638, studied). Remarks: A. ferreirai from the Upper Carboniferous (Piedra Shotle Formation, Chubut) of Argentina, was originally attributed to the palaeodictyopterans but clearly exhibits characters typical for Taiophlebia, and can be therefore transferred to the latter genus.Published as part of Martins-Neto, R. G., Gallego, O. F., Brauckmann, C. & Cruz, J. L., 2007, A review of the South American Palaeozoic entomofauna Part I: the Ischnoneuroidea and Cacurgoidea, with description of new taxa, pp. 87-101 in African Invertebrates 48 (1) on page 98, DOI: 10.5281/zenodo.766762
On f-domination: polyhedral and algorithmic results
No full textGiven an undirected simple graph G with node set V and edge set E, let fv, for each node v∈ V, denote a nonnegative integer value that is lower than or equal to the degree of v in G. An f-dominating set in G is a node subset D such that for each node v∈ V D at least fv of its neighbors belong to D. In this paper, we study the polyhedral structure of the polytope defined as the convex hull of all the incidence vectors of f-dominating sets in G and give a complete description for the case of trees. We prove that the corresponding separation problem can be solved in polynomial time. In addition, we present a linear-time algorithm to solve the weighted version of the problem on trees: Given a cost cv∈ R for each node v∈ V, find an f-dominating set D in G whose cost, given by ∑ v∈Dcv, is a minimum
Taiophlebia niloriclasodae Martins-Neto 2007, sp. n.
No full textTaiophlebia niloriclasodae Martins-Neto, sp. n. Fig. 10 Etymology: Anagram derived from Nilson, Lorelai, Rita, Claus, Sonis, and Daiana, dynamic students of Geosciences Department, Universidade do Vale do Rio dos Sinos– UNISINOS, leadered by Dr Tania Lindner Dutra, the team that collected the holotype. Description: Fore wing 104 mm long and 34 mm wide, as preserved, with straight costal margin and slightly acuminate apex. Subcostal area notably wide close the base, progressively narrowing toward the apex. ScA well-defined with numerous secondary veinlets and anastomosed pattern of cross-veins. ScP long with at least two strong secondary branches and several, relatively long, distally dichotomous veinlets, unbranched. RP origin at 1/5 of wing base. RP slightly sigmoid, with five secondary branches. MA long, slightly sigmoid, three-branched. MP+CuA origin little before RP origin level with at least eight terminal branches, clade-like. CuP two-branched with CuP1 being the smallest, converging to MP+CuA, fusing distally; CuP partially preserved, oblique to anal margin, reaching it at about 1/3 of wing base. AP1 fuses to AP2 close to the wing base, Y-shaped.AP1+2 parallel to CuP2. Intense pattern of crossveins forming mosaics of heterogeneous cells in the whole preserved wing. No ornamentation pattern. Holotype: BRAZIL: Santa Catarina State: Taió municipality; Upper Carboniferous, Itararé Subgroup, upper part of the Rio do Sul Formation. Housed at Geosciences Department, UNISINOS, Rio Grande do Sul, Brazil.Published as part of Martins-Neto, R. G., Gallego, O. F., Brauckmann, C. & Cruz, J. L., 2007, A review of the South American Palaeozoic entomofauna Part I: the Ischnoneuroidea and Cacurgoidea, with description of new taxa, pp. 87-101 in African Invertebrates 48 (1) on page 97, DOI: 10.5281/zenodo.766762
Scinax tropicalia Novaes-E-Fagundes & Araujo-Vieira & Entiauspe-Neto & Roberto & Orrico & Solé & Haddad & Loebmann 2021, sp. nov.
No full textNovaes-E-Fagundes, Gabriel, Araujo-Vieira, Katyuscia, Entiauspe-Neto, Omar M., Roberto, Igor J., Orrico, Victor G. D., Solé, Mirco, Haddad, Célio F. B., Loebmann, Daniel (2021): Scinax tropicalia Novaes-E-Fagundes & Araujo-Vieira & Entiauspe-Neto & Roberto & Orrico & Solé & Haddad & Loebmann 2021, sp. nov. Journal of Herpetology 10 (1): 173-177, DOI: 10.1670/16-048, URL: http://dx.doi.org/10.5281/zenodo.456283
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