201,046 research outputs found
Contreras, C. "De lo oblicuo a lo aporético: responsabilidad, justicia y deconstrucción"
No full textContreras, C. "De lo oblicuo a lo aporético: responsabilidad, justicia y deconstrucción". Revista de Filosofía, Universidad de Chile 63 (2007): 111-116
CONTRERAS C., Medardo
No full textLetter from Medardo Contreras C. to General Plutarco Elías Calles. Condolences on the death of his wife. / Carta de Medardo Contreras C. al Gral. PEC. Pésame por el fallecimiento de su esposa
Las contribuciones ornitológicas de Julio R. Contreras
No full textEn este capítulo se resume la actividad de Julio R. Contreras y sus contribuciones científicas en el ámbito de la ornitología.Fil: Di Giacomo, Adrian Santiago. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; Argentin
Cascada en Contreras, paisaje
No full textNota: En la guarda está inscrito: vista de una cascada en Contreras c/24559 2456
Estudo de uma fonte de alimentação trifásica, alto fator de potência, comutação suave, com um único estágio de processamento de potência
No full textVaejovis tenamaztlei Contreras-Felix, Francke & Bryson 2015
No full textVaejovis tenamaztlei Contreras-Félix, Francke & Bryson, 2015 Figures 4, 35l, 36l, 3 hl, 38l, 39l, 40k, 41l, 52 Vaejovis tenamaztlei Contreras-Félix, Francke & Bryson, 2015: 133 –138, Figs: 2–14. Type material. Holotype male. MEXICO: Aguascalientes: Municipio Calvillo, 3 km east of “Alamitos” dam, Sierra del Laurel (N 21.73531°, W 102. 69753°, elev. 2440 m), VII-24-2012. Cols.: O. Francke, G. Contreras, D. Barrales & A. Valdez. 1 ♂ (CNAN–T0871). Examined. Paratypes: MEXICO: Aguascalientes: Same data as the holotype. 1 ♂, 3 ♀ (CNANT–0872). MEXICO: Aguascalientes, Municipio Calvillo, Los Alisos, Sierra del Laurel (N 21.725611° W 102.700389°, elev. 2415 m), I- 10-2011. Col.: J. C. Arenas. 1 ♂ (AMNH). Examined. Other specimens examined. MEXICO: Aguascalientes: Municipio Calvillo, Los Alisos, Sierra del Laurel (N 21.725611°, W 102.700389°, elev. 2415 m), VII-20-2010. Col.: R. W. Bryson Jr. 1 ♀ (AMNH), 5 adult ♀, 3 subadult ♂ (CNAN). MEXICO: Aguascalientes: Municipio Calvillo, 3 km east of “Alamitos” dam, Sierra del Laurel (N 21.73531°, W 102.69753°, elev. 2440 m), VII-242012. Cols.: O. Francke, G. Contreras, D. Barrales & A. Valdez. 2 adult ♂, 9 juvenile ♀ (CNAN-Sc13775). Diagnosis. Adult total length ranging from 19 mm to 26 mm (Fig: 52-a, b). Carapace (Fig: 35-l) on males shorter than metasomal segment V (Carapace L/MS-V 0.85 ±0.06), but as long or slightly longer on females [Carapace L/ MS-V 1.02±0.02], and longer than pedipalp femur in both males (Carapace L/Femur L 1.13±0.13) and females [Carapace L/Femur L [1.22±0.07]; anterior margin of carapace slightly concave, almost straight, without median notch. Tergite VII with median lateral and lateral carinae weak, composed of a discontinuous line of rounded granules, and both pairs of carinae not reaching posterior margin. Pectinal tooth count on males 16–17 (mode= 16), on females 13–14 (mode=14). Sternite V without a whitish spot on posterior edge; sternite VII with lateral carinae weak, composed of a cuticular ridge and some scattered granules. Metasomal segment I wider than long (MSI L/ W 0.7 ±0.01); intercarinal spaces on metasomal segments I–V shagreened; metasomal segment V wider than deep (MS-V W/D 1.15 ± 0.1). Vesicle (Fig: 36-l) long and slender (L/ W 2.16 ± 0.1; W/D 1.3 ± 0.03); dorsally with a conspicuous central depressed vesicular gland, deeper on adult males than on females and subadult males, on which it is almost absent. Pedipalp femur (Fig: 37-l) is less than three times longer than wide (L/ W 2.87 ± 0.13) [2.75 ± 0.15]. Patella (Fig: 38-l) less than three times longer than wide (L/ W 2.89 ± 0.11) [2.77 ± 0.13]; patellar prolateral carina weak, with few sharp scattered granules. Chela (Fig: 39, 40-l) rounded (CM L/W 2 ± 0.09 [2 ± 0.1]), as wide as deep (CM W/D 1 [1]); with prolateral median-ventro submedian carina feebly granular, but conspicuously more elevated than other carinae which are represented by low cuticular ridges. Pedipalp chela fingers dentate margins straight, without scalloping. Hemispermatophore (Fig: 41-l): Lamelliform (TL: 3.6; LL: 2;LW: 0.5). Lamina wider at the base, with a median apical crest; laminar hooks with three rounded ridges. Capsular lobe present, well-sclerotized and may present some faint, small granules (updated from Contreras-Fèlix et al., 2015). Full morphometric variation is given in tables 13 and 14. Setae variation is given in tables 9–12. Distribution. Known only from the two localities within the higher elevations of the Sierra del Laurel in southwestern Aguascalientes. This species probably occurs in other regions within the Sierra del Laurel, including adjacent areas in northern Jalisco. Natural history. found in winter during the dry season, as well as in the summer during the rainy season. Specimens were found underneath rocks in oak forest during the day. Specimens from Los Alisos were found along the base of a rock wall, which followed the crest of a hill. Among the specimens collected during July, three females had broods on their back, and the counts of newborns were 14, 18 and 22, respectively; the young were positioned randomly on the mother’s back.Published as part of A, Contreras-Félix Gerardo & Oscar, Francke B., 2019, Taxonomic revision of the " mexicanus " group of the genus Vaejovis C. L. Koch, 1836 (Scorpiones: Vaejovidae), pp. 1-100 in Zootaxa 4596 (1) on pages 82-83, DOI: 10.11646/zootaxa.4596.1.1, http://zenodo.org/record/265909
Ctenomys dorbignyi Contreras & Contreras 1984
No full text<i>Ctenomys dorbignyi</i> <p> This species was originally described by Contreras and Contreras (1984) establishing a narrow distribution in the north of the Corrientes Province. Later, its range was extended, considering four disjunct groups of populations (nucleuses) over the assumption of a common chromosome number 2n = 70 (Contreras and Scolaro 1986). These nucleuses were designated North (Mbarigüí), South (Paraje Sarandicito, Los ángeles, Esquina and Laguna Itá), East (Contreras Cué) and West (Loma Alta and Mburucuyá), and were differentiated over the base of external and cranial morphometry (Contreras and Scolaro 1986). Based on discriminant analyses, these authors stated that each nucleus “behaves as a good taxonomic entity”. Karyotypical information was then published by Ortells et al. (1990) who found that Mbarigüí and Paraje Sarandicito had undistinguishable 2n = 70 FN = 84 karyotypes (Table 1). Hence, these two disjunct nucleuses, although they are 350 km away, maintained their adscription to <i>Ctenomys dorbignyi</i> and were identified as relicts of a widespread nearly continuous ancestral stock of the Corrientes group. More recently Argüelles et al. (2001) ascribed to this species a third karyotypically related group of populations from the localities of Paso Vera and San Joaquín de Miraflores, at the Entre Ríos Province. Taking these three nucleuses into consideration <i>C. dorbignyi</i> was considered Near Threatened in the IUCN Red List (Bidau et al. 2008b).</p> <p> Notwithstanding, the Entrerrianan populations have a different chromosomal arm number, FN = 88 (Argüelles et al. 2001), which indicates that, under the applied delimitation criterion this third nucleus is a separate lineage. In addition, when included into the cyt-b phylogeny, the populations of San Joaquín de Miraflores and Paso Vera fall into the clade containing the <i>Ctenomys pearsoni</i> complex (Figure 3), as occurs with the also Entrerrianan population of Médanos which also has a FN = 88 (García et al. 2000a), confirming these populations are not members of the Corrientes group. The northern (Mbarigüí and Paraje Angostura) and the southern (Paraje Sarandicito) nucleuses split apart in the basal clades of the Corrientes group (Figure 3), and also form unique separate SSR clusters (Table 1, see below). Thus, we propose to restrict <i>Ctenomys dorbignyi</i> to the northern populations: Mbarigüí (topotype) and Paraje Angostura. It should be remarked that Contreras et al. (1985) included at least seven additional neighboring populations in the northern nucleus of <i>C. dorbignyi</i>. However, no genetic or cytogenetic studies have been carried out in these populations.</p>Published as part of <i>Caraballo, Diego A. & Rossi, María Susana, 2018, Integrative lineage delimitation in rodents of the Ctenomys Corrientes group, pp. 35-47 in Mammalia (Warsaw, Poland) (Warsaw, Poland) 82 (1)</i> on pages 40-41, DOI: 10.1515/mammalia-2016-0162, <a href="http://zenodo.org/record/7837626">http://zenodo.org/record/7837626</a>
FIGURE 1. Coulteria a-c in Coulteria lewisiae (Leguminosae: Caesalpinioideae) a new species for Infiernillo region, Mexico
No full textFIGURE 1. Coulteria a-c pollen grains different views (J.L. Contreras 3048); d male flower style; e male flower stigma close up (J.L. Contreras 2510); f female flower stigma; g female flower abaxial sepal (JL. Contreras 3155).Published as part of Sotuyo, Solange & Contreras-Jiménez, José Luis, 2021, Coulteria lewisiae (Leguminosae: Caesalpinioideae) a new species for Infiernillo region, Mexico, pp. 220-226 in Phytotaxa 498 (3) on page 221, DOI: 10.11646/phytotaxa.498.3.8, http://zenodo.org/record/542428
Corydalus colombianus Contreras-Ramos 1998
No full textCorydalus colombianus Contreras-Ramos, 1998 Distribution. Colombia. Materials examined. Colombia:Valle del Cauca: Buenaventura, Anchicayá, 400 m, II- 1985, M. Alvarado (1 ♀-MUSENUV); Buenaventura, Anchicayá, 25 -III- 1988, C. Serrato, attracted to light (1 ♀-MUSENUV); Buenaventura, Bajo Anchicayá, 29 -VIII- 1992, light trap (1 ♀-MUSENUV); Calima Medio, Rio Azul, 500 m, VII- 1994, C. Aldana, attracted to light (1 ♀-MUSENUV).Published as part of Ardila-Camacho, Adrian, 2014, A new species of Corydalus Latreille, 1802 (Megaloptera, Corydalidae) and first record of C. clavijoi Contreras-Ramos, 2002 and C. nubilus Erichson, 1848 from Colombia, pp. 107-118 in Zootaxa 3811 (1) on page 111, DOI: 10.11646/zootaxa.3811.1.6, http://zenodo.org/record/22466
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