8,188 research outputs found
Carta de Gabriel Velásquez Posada para Ignacio Rengifo
No full text2 ImágenesCarta de Gabriel Velásquez Posada para Ignacio Rengifo sobre la necesidad de abrir un Instituto de Bellas Artes en Cali y su interés en trabajar en ella dando clases de escultura. Fechada en Medellín
El Tlacuache Núm. 699 (2015). 699 Año 13 (2015) noviembre. El Tlacuache
No full textEl patrimonio cultural de un pueblo japonés: Habitar la Hacienda de Temixco y su significado por Brisa Katzuyo Mejía Yoshino. - La cumbre de París: Permiso para destruir o ascenso de la conciencia humana por Alberto Betancourt Posada
African origin of the malaria parasite Plasmodium vivax.
No full textPlasmodium vivax is the leading cause of human malaria in Asia and Latin America but is absent from most of central Africa due to the near fixation of a mutation that inhibits the expression of its receptor, the Duffy antigen, on human erythrocytes. The emergence of this protective allele is not understood because P. vivax is believed to have originated in Asia. Here we show, using a non-invasive approach, that wild chimpanzees and gorillas throughout central Africa are endemically infected with parasites that are closely related to human P. vivax. Sequence analyses reveal that ape parasites lack host specificity and are much more diverse than human parasites, which form a monophyletic lineage within the ape parasite radiation. These findings indicate that human P. vivax is of African origin and likely selected for the Duffy-negative mutation. All extant human P. vivax parasites are derived from a single ancestor that escaped out of Africa
Reseña de A. R. Posada, Métricos pinceles: literatura y artes plásticas en el Siglo de Oro, Madrid-Frankfurt, Iberoamericana-Vervuert, 2022.
No full textReview of A. R. Posada, Métricos pinceles: literatura y artes plásticas en el Siglo de Oro, Madrid-Frankfurt, Iberoamericana-Vervuert, 2022
Carta enviada por Joaquín Antonio Uribe a Marceliano Posada Puerta
No full text1 hojaCarta manuscrita enviada por Joaquín Antonio Uribe a Marceliano Posada Puerta agradeciendo el artículo que escribió sobre Mutis que había salido en El Heraldo. También le cuenta que artículo sobre R. Puerta quedará muy estrecho debido a la escasez de datos. Le envía a la sobrina la monjita un paquete. Se encuentra realizando un enumeración de especies de animales, vegetales y minerale
Miconia rheophytica Posada, sp. nov.
No full textMiconia rheophytica Posada ‒Herrera & Almeda, sp. nov. (Figs. 1 & 2) Type:— COLOMBIA. Antioquia: Municipio de San Luis, río Samaná Norte, 2 km abajo del puente de la carretera Medellín ‒ Bogotá. 6° 0’ 59.19’’N, 75° 55’ 51.04’’W, 430 m, 18 diciembre 2016 (fl, fr), S. E. Hoyos-Gómez 3105 (holotype: HUA!). Figs. 1, 2. Diagnosis: Unusual and unique among species of the Octopleura clade in being rheophytic and in having a combination of narrowly elliptic to ovate-lanceolate leaf blades with entire to subentire margins that have evenly spaced spreading smooth eglandular trichomes 0.8−1.4 mm long, unribbed hypanthia covered with a mixture of basally roughened trichomes and dendritic trichomes with short axes, anthers with two ± truncate apical pores, eglandular anther appendages, 3-locular ovary, and berries that are bright blue at maturity. Shrub 0.6–1.5 m tall with open and lax branching. Distal internodes rounded-quadrate, nodal line absent. Indumentum on distal internodes, adaxial surfaces of petioles, and primary and secondary elevated veins on abaxial foliar surfaces consisting of a moderate to dense cover of brown dendritic trichomes with short axes and terete radiating arms. Leaves of a pair somewhat anisophyllous; petioles 0.3−1.8 cm long, deeply canaliculate adaxially but this is often obscured by indumentum; blades 5.2−9.4 × 1−1.8 cm, narrowly elliptic to ovate-lanceolate, the base rounded to obtuse, the apex acuminate to attenuate, the margin essentially entire or vaguely subentire with evenly spaced spreading smooth eglandular trichomes 0.8−1.4 mm long, papyraceous when dry; adaxial surface of mature blade glabrous, abaxial surface essentially glabrous but commonly with dendritic trichomes with short axes persisting to varying degrees along contact points of primary and secondary veins with blade surface and at the point where these veins diverge from one another at the blade base, 3−5-plinerved including the tenuous marginal veins with the innermost pair of secondary veins diverging from the midvein above the blade base. Inflorescences axillary in short dichasia 0.6−1 cm long with 2−3 flowers or dichasia sessile to subsessile in leaf axils; bracts and bracteoles 0.5−0.7 × 0.2−0.3 mm, triangular-subulate, light green or pale red, glabrous, persistent in fruit. Flowers 5-merous on pedicels 3.4−4.3 mm long with dendritic trichomes like those on the petioles and distal internodes but less dense. Hypanthia 3−3.4 × 1.4−1.7 mm, campanulate and unribbed but somewhat constricted and tapered distally below the torus into a neck-like distension 1.8−2 mm long, densely covered with a mixture of reddish-purple elongate somewhat spreading trichomes 0.3−0.5 mm long with roughened bases and dendritic trichomes with short axes. Calyx open in bud and persistent in fruit, greenish-yellow, adaxially glabrous, abaxially nearly glabrous or with indumentum like the hypanthium but much sparser, lobes 1.2−1.3 mm, depressed-triangular, the margin entire, the apex bluntly acute; exterior calyx teeth 1.4 × 1.3 mm, bluntly conic-triangular and tipped with a smooth trichome that slightly exceeds the lobes. Petals 1.2−1.3 × 1.6−1.8 mm, obovate, the margin entire, the apex rounded-truncate, white, densely papillose on both surfaces, reflexed at anthesis. Stamens 10, isomorphic, erect and closely encircling the style at anthesis; filaments 1.6−1.8 × 1.2 mm, white but yellow distally, glabrous; anther thecae 1.5 × 0.5 mm, linear-oblong, opening by two ± truncate apical pores, yellow; connective yellow, prolonged dorso-basally into a blunt deflexed eglandular appendage 0.3 mm long. Ovary 3 × 3 mm long at anthesis, 3-locular with axile placentation, completely inferior; style 5.3 mm long, 0.7 mm wide at the middle, terete and tapering to 0.5 mm distally, white, glabrous; stigma rounded-truncate, 0.66 mm wide and somewhat expanded when receptive. Berries with enveloping hypanthia 3.4−4.2 × 3.4−5 mm, ± globose to subglobose, reddish-purple when immature turning bright indigo blue when mature, the indumentum of mature hypanthia persistent but scattered and inconspicuous. Seeds 0.75−0.77 × 0.4−0.45 mm, ovoid, lateral and antiraphal symmetrical planes elliptic to elliptic-ovate, the highest point toward the chalazal side; raphal zone oblong, extending the entire length of the seed and expanded along its entire length on all sides into a well-developed skirt-like angled appendage that exceeds the corpus of the seed and collapses when dry. Phenology:—This species has been collected in flower in March, June, July, November, and December; fruiting material has been collected in March, June, July, September, November, and December. It seems possible that it may flower and fruit most months of the year. Distribution and habitat:— Miconia rheophytica appears to be largely restricted to the Magdalena Medio region of Colombia where it is known only from the Department of Antioquia (Fig. 3). It grows along rocky banks of Río Nechí, and in the Río Samaná Norte and Río Claro river canyons in the municipalities of Anorí and San Luis at elevations of 110− 600 m. Conservation status:—This species is known to us from the type and eight other collections. The type and one of the paratypes were recently collected in the river canyon of Samaná Norte. Two collections were made in the municipio of Anorí and the other four come from the river canyon of Río Claro. Collections from Río Claro may be afforded some protection in Reserva Natural Cañón de Río Claro, a private conservation area covering some 500 hectares. The other collections come from areas that have no official protected status. The Samaná Norte river canyon is the type locality of Miconia rheophytica. This region has recently attracted the attention of scientists and conservationists. The rheophytic plants that grow along this river are under threat because a dam for a hydroelectric plant is planned to flood a large tract of the Samaná Norte river. Plans for this dam are already in progress and a license has been granted to the interested firm by the Colombian Environmental Licensing Agency (ANLA) based on an environmental impact study (Hoyos-Gómez & Bernal 2018). The EOO is 12,900 km ² and the AOO is 16 km ². Because of its limited AOO, fragmented population structure in isolated river canyons, and the threat that rheophytic plants in these canyons face from massive flooding for dam construction, we recommend a conservation classification of Endangered (EN): B2ab(iii). Discussion: — Miconia rheophytica is readily distinguished from all other members of the Octopleura clade by its rheophytic habitat preference, narrowly elliptic to ovate-lanceolate leaf blades with entire to subentire margins that have evenly spaced spreading smooth eglandular trichomes 0.8−1.4 mm long, indumentum of dendritic trichomes with short axes and terete radiating arms on distal internodes, adaxial petiole surfaces, and primary and secondary veins on abaxial leaf surfaces, unribbed hypanthia that are constricted and tapered distally below the torus and covered with a mixture of basally roughened trichomes and dendritic trichomes with short axes, eglandular anther appendages, 3- locular ovary, and berries that are bright blue at maturity. By virtue of having moderately anisophyllous leaf blades at each node, papillose petals, and seeds with raphal margins that are expanded on all sides into well-developed fleshy appendages, M. rheophytica can confidently be assigned to the Quinquenervia subclade within the Octopleura clade (Gamba & Almeda 2014). Of the seven species presently included in this subclade, M. rheophytica appears to be closest to M. atropurpurea Gamba & Almeda (2014: 57), M. neocoronata Gamba & Almeda (2014: 95), and M. reitziana (Cogn. & Gleason ex Gleason 1939: 115) Gamba & Almeda (2014: 117). All three of these species differ consistently from M. rheophytica in having anthers with one dorsally inclined apical pore, 5-locular ovaries, and bluntly 10-ribbed hypanthia. Among these three close relatives, only M. atropurpurea has mature berries that are bright blue like M. rheophytica but it otherwise differs consistently in having elliptic to elliptic-ovate leaves that are wider (5−7 cm) and typically flushed red-purple abaxially, and hypanthia with persistent spreading smooth trichomes 1–1.3 mm long. Both M. neocoronata and M. reitziana differ from M. rheophytica in having berries that are blue-black at maturity. The former has ovate to elliptic-ovate leaves that are also wider (5−9.5 cm). The latter also has ovate to elliptic-ovate leaves that are much wider (7.8−11 cm) and its hypanthia are covered with spreading persistent elongate smooth trichomes 0.9−1.2 mm long that are intermixed with resinous slightly furrowed more or less stalked glands ca. 0.05 mm long. For additional descriptive and distributional information for these species see Gamba & Almeda (2014). Etymology:—The specific epithet is derived from the word rheophyte, a plant that grows along margins of fast moving river currents with frequent flooding. This is an environment that is particularly harsh for many organisms. Additional specimens examined: — COLOMBIA. Antioquia: Municipio de San Luis, Cañón del Río Claro, sector sur-oriental 5° 53’ N, 74° 39’ W, 350‒400 m, 30 marzo 1984 (fl, fr), A . Cogollo 1499 (HUA!, JAUM!); Municipio de San Luis, 600 m, 12 septiembre 1982 (fr), E . Rentería & A. Cogollo 2628 (JAUM!); Municipio de Anorí, vía Dos Bocas- Providencia, de Toná-Liberia a lo largo del río Nechí 7° 28 N, 74° 56’ W, 110−280 m, 11 julio 1987 (fl), R . Callejas, J. Betancur & F. J. Roldán 4538 (HUA!); Municipio de San Luis, Cañón del Río Claro, 5° 49’ 59.76’’ N, 74° 52’ 00.04’’W, 435 m, 4 noviembre 2006 (fl, fr), H . David, F. Giraldo, A. Patiño & Estudiantes de Ecología Tropical 1423 (HUA!); Municipio de Anorí, corregimiento de Charcón, 500 m, 8 junio 1971 (fl, fr), D. D. Soejarto 1971 (HUA!); Municipio de San Luis, Parque Ecológico Cañón del Río Claro, sector sur, orilla del río, margen izquierda, 325 m, 10 julio 1983 (fr), A . Cogollo & R. Borja 548 (HUA!). Municipio de San Luis, río Samaná Norte, margen derecha, 360 m, 18 diciembre 2016 (fl, fr), S. E . Hoyos-Gómez et al. 3118 (HUA!).Published as part of Posada-Herrera, Juan Mauricio & Almeda, Frank, 2018, Miconia rheophytica (Melastomataceae: Miconieae), a new and endangered species from the Magdalena Medio region of Colombia, pp. 55-61 in Phytotaxa 371 (1) on pages 56-60, DOI: 10.11646/phytotaxa.371.1.7, http://zenodo.org/record/478032
P–T conditions in mylonitic gneiss from Posada Shear Zone, NE Sardinia
No full textThe Posada Valley shear zone is part of a regional-scale mylonitic belt that runs from Posada (NE Sardinia) to Asinara Island (NW Sardinia) separating the Variscan Medium Grade Metamorphic Complex to the south from the Migmatite Complex to the north. In the Posada Valley, a dextral top–to–the SE shear belt developing ductile and brittle–ductile D2 mylonites has been recognized. In southern Gallura the dextral shear movement follows a sinistral top–to–the NW shear belt, coeval to the initial D2 post–collisional phase. At Punta Orvili, a few kilometers north from Posada village, a sequence of mylonitic gneiss with subordinate calc–silicate nodules and metabasite lenses crop out. The main foliation at the mesoscale is the S2 schistosity striking N 60–80°and dipping 30°–50° SE. Locally, the S2 schistosity is affected by centimetre size, sinistral strike–slip greenschist shear zones, striking N 30° and dipping 60° SE. Three mineral lineations have been recognized on the S2 schistosity: a feldspar+quartz lineation trending N30°–50° and plunging 20°–30° SW; a quartz lineation trending N 40°, plunging 30° SW; a biotite±chlorite lineation trending N 20° and plunging 15°–30° SW. The mylonitic gneiss consists of quartz, plagioclase, K-feldspar, biotite, white mica, fibrolite, ± garnet. Centimetric garnet porphyroblasts, locally observed, are Alm58–68, Pyr8–12, Grs2–3, Sps16–31. The mylonitic gneiss is characterized by the widespread occurrence of millimetre– to centimetre–sized nodules enveloped by the S2 foliation. The nodules occur in four textural types: (i) quartz–rich, (ii) K-feldspar–rich, (iii) plagioclase–rich, and (iv) sillimanite–rich nodules. The K-feldspar–rich nodules are made up of polygonal aggregates of submillimetric K-feldspar crystals or by elongated, anhedral K-feldspars up to 5mm in length associated with smaller quartz–feldspathic grains. Perthite exsolutions and very thin albite rims are often observed in K-feldspar. The plagioclase–rich nodules consist of plagioclase (An20) aggregates with subordinate quartz and K-feldspar. The feldspar rich–nodules probably document an incipient melting affecting the rock prior of the mylonitic deformation. Application of the garnet–biotite geothermometer and GASP geobarometer to some selected mylonitic gneiss yielded P–T conditions of P ~ 6 kbar, T = 540–620°C. These P–T conditions most likely refers to the development of the D2 deformation, i.e. to the development of the sinistral top–to–the NW shear deformation. In conclusion, the Posada shear zone is first characterized by a medium– to high–grade sinistral shear movement followed by dextral shear movement as shown by Carosi et al. (2012) in southern Gallura
Imperial collapse or revolution? A discussion of Brian R. Hamnett’s The End of Iberian Rule on the American Continent, 1770–1830
No full textA book forum featuring The End of Iberian Rule on the American Continent, 1770–1830 by Brian R. Hamnett. His 2017 volume argues that the origins of Ibero-American Independence must be found in the interplay between the Spanish and Lusitanian monarchies and the American empires ruled by them. It was internal conflict within these empires that led to independence, not revolution, separatist sentiment, or the emergence of American nation-states. Monica Ricketts, Eduardo Posada-Carbó, Clément Thibaud strongly commend the work while offering constructive criticism and analysis. Reviewers raise questions about socio-cultural forces and changes, the role of politics, the exclusion of an Atlantic perspective, and the lack of attention to revolutionary thought and nationalism. The book is celebrated for its breadth, its historiographical contribution, and the strength of its argument for the continuities from the Iberian monarchies and empires to the nation states that grew out of them. Hamnett responds to the reviewers
Recensiones [Revista de Historia Económica Año II Primavera-Verano 1984 n. 2 pp. 185-208]
No full textLester K. Little. Pobreza voluntaria y economía de beneficio en ¡a Europa medieval (Miguel Ángel Ladero Quesada).-- Fermín Rey Velasco. Historia económica y social de Extremadura a finales del Antiguo Régimen (Enrique Llopis Agelan).-- D. R. Ringrose. Madrid and the Spanish Economy, 1360-1850 (Agustín González Enciso).-- J. Romero González. Propiedad agraria y sociedad rural en la España mediterránea. Los casos valenciano y castellano en los siglos XIX y XX (Ramón Garrabou).-- Karl Dietrich Bracher. Controversias de historia contemporánea sobre fascismo, totalitarismo y democracia (Mercedes Cabrera).-- Banco De España. Actas del Primer Congreso sobre Archivos Económicos de Entidades Privadas (Pablo Martín Aceña).-- Francisca Alexandre Tena. Catálogo de la Biblioteca y Archivo del Instituto Valenciano de Economía (Teresa Tortella).-- Manuel Garzón Pareja. La Hacienda de Carlos II (Joaquín del Moral Ruiz)Publicad
¿Qué tan indómita es Colombia?
No full textEntrevista con la profesora Paula Andrea Barreiro Posada, autora del libro Indómita: Colombia según el cine extranjero. La autora es doctora en artes de la Universidad de Antioquia y habló con la Editorial de la Universidad del Rosario sobre su texto y sobre la manera en que se construyó la representación y escenificación de lo colombiano en el cine extranjero durante los últimos cuarenta años.Interview with Professor Paula Andrea Barreiro Posada, author of the book Indómita: Colombia según el cine extranjero. The author has a PhD of arts from the University of Antioquia and spoke with the Editorial of the Universidad del Rosario about her text and about the way in which the representation and staging of the Colombian was built in foreign cinema during the last forty years
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