Bernardo Ramiro Ramírez-Padilla - Academia.edu (original) (raw)

Papers by Bernardo Ramiro Ramírez-Padilla

Revista Novedades Colombianas, Dec 29, 2022

The Mariposas de Cristal Ecological Trail is a forest remnant located in the Parcelación Señora M... more The Mariposas de Cristal Ecological Trail is a forest remnant located in the Parcelación Señora María Rosa, in the village of La Venta, municipality of Cajibío, department of Cauca, on km 14 of the Panamerican Highway between Popayán and Cali, it corresponds to a narrow strip of continuous gallery forest that protects two streams that delimit the parcel; it includes gentle slopes, which vary between 1830 and 1880 meters above sea level. With the purpose of knowing the richness of vascular plants present in the ecological path, a richness that can become a possible source of propagules for the ecological restoration of nearby places, monthly samplings were made, herborizing the fertile specimens and registering those species in vegetative state. We found 100 families, 246 genera and 346 species, of which 328 are native and 18 are introduced. There is a predominance of the families Asteraceae, Orchidaceae, Poaceae, Rubiaceae, Fabaceae, Melastomataceae, Piperaceae and Solanaceae; the dominant growth habit corresponds to herbs and subshrubs, followed by shrubs and trees. Many of these species are of interest for the production of flowers and fruits used by fauna or for their contribution to the dynamics of the forest area and the maintenance of diversity.

Revista Novedades Colombianas, 2019

La familia Erpodiaceae pertenece al orden Orthotrichales, sus representantes son plantas pleurocá... more La familia Erpodiaceae pertenece al orden Orthotrichales, sus representantes son plantas pleurocárpicas, terrestres, de tamaño pequeño a mediano (3-20 mm), finas y delgadas, con hojas ecostadas y cápsulas inmersas. Según tratamientos hechos a la familia, el número de géneros varía entre uno y cinco. Sus elementos están ampliamente distribuidos en nichos bien específicos; se encuentran con preferencia en áreas secas de las regiones tropicales y subtropicales de todo el mundo, en un rango altitudinal que va desde el nivel del mar hasta los 1.700 msnm. En el Neotrópico, la familia está representada por 12 especies pertenecientes a cinco géneros; de las cuales 11 se encuentran en Suramérica y dos en Colombia. En este trabajo se presenta la descripción de la familia, géneros y especies presentes en el país y su distribución por departamentos, con la adición de nuevos registros.

Chemico-Biological Interactions, 2009

Comparative studies on free radical scavenging by isomers of hydroxybenzyl alcohols (HBAs) were c... more Comparative studies on free radical scavenging by isomers of hydroxybenzyl alcohols (HBAs) were carried out to understand the molecular mechanisms involved in the antioxidant action. Using rat liver mitochondria as model systems, we have examined the radioprotective and antioxidant effects of hydroxybenzyl alcohols. Apart from their ability to scavenge free radicals and ferric reducing power, HBAs have shown good protection against radiation and oxidative stress. Using peroxyl radicals as initiator of reactive oxygen species (ROS), studies were carried out to evaluate antioxidant properties of HBAs against rat liver mitochondrial membrane components such as lipid and protein. Our results show that HBAs are potent inhibitor of lipid peroxidation and protein oxidation thus suggesting their role as free radical scavengers. In the presence of HBAs, restoration of depleted activity of Mn-SOD has also been investigated. In the presence of 2-hydroxybenzyl alcohol (2-HBA) complete restoration in the activity of Mn-SOD was observed on exposure to 2,2-azobis(2-amidinopropane) dihydrochloride (AAPH). Free radical scavenging ability of HBAs were found to be comparable to alpha tocopherol. Pulse radiolysis technique has been used to study the reactions of HBAs with various biologically relevant reactive species such as hydroxyl radical (• OH) and trichloromethyl peroxyl radical (CCl 3 O 2 •). HBAs could scavenge • OH radical giving initially OHadducts which in turn decays to phenoxyl radicals. Reactions of phenoxyl radicals of HBAs with ascorbic acid have been also studied. Redox potential of HBAs has been evaluated with cyclic voltammetry. Studies clearly suggest a structural reactivity correlation between radical scavenging and antioxidant properties of these isomers of HBA. Among the 3 isomers of HBAs, 4-HBA and 2-HBA are found to have better radical scavenging and antioxidant properties than 3-HBA.

Instituto de Investigación de Recursos Biológicos Alexander von Humboldt, 2021

Esta guía comprende un sistema de inventario estandarizado, la descripción general y detallada de... more Esta guía comprende un sistema de inventario estandarizado, la descripción general y detallada de la familia Rubiaceae, una lista de géneros para el país y su distribución mundial y nacional; la clave, diagnosis e ilustraciones para 109 géneros, entre los que se ...

Revista de la Academia colombiana de ciencias …, 2004

Se describen e ilustran dos nuevas especies de Araliaceae [Schefflera munchiquensis y Schefflera ... more Se describen e ilustran dos nuevas especies de Araliaceae [Schefflera munchiquensis y Schefflera awa] propias del sur de la cordillera Occidental de Colombia. Las nuevas especies pertenecen al grupo Sciodaphyllum que comprende cerca de 175 especies distribuidas desde el nivel del mar hasta cerca de los 3500 m. de altitud en Centroamérica, los Andes, Jamaica y el altiplano Guayanés. Adicionalmente se registran dos especies [Schefflera diplodactyla Harms y Schefflera epiphytica A.

Bryophyte Diversity and Evolution, 2002

A moss inventory for Departamento de Nariño, Colombia records 392 species distributed among 169 g... more A moss inventory for Departamento de Nariño, Colombia records 392 species distributed among 169 genera and 51 families. Taxa newly recorded for Colombia include: Daltonia jamesonii Taylor, Dicranella varia (Hedw.) Schimp., Isopterygium subbrevisetum (Hampe) Broth., Lepyrodontopsis trichophylla (Hedw.) Broth., Macromitrium trichophyllum Mitt., Philonotis incana (Taylor) H. Rob., Racomitrium lamprocarpum (Müll. Hal.) A. Jaeger, Rauiella lagoensis (Hampe) W. R. Buck, Sphagnum cuculliformes H. A. Crum, Stenodesmus tenuicuspis (Mitt.) A. Jaeger, Syrrhopodon isthmi W. D. Reese, Taxithelium pluripunctatum (Renauld & Cardot) W. R. Buck; Lepyrodontopsis and Stenodesmus represent genera new to the country.

Based on herbarium records, data bases and field studies in different localities of the Patia Riv... more Based on herbarium records, data bases and field studies in different localities of the Patia River valley in southwestern Colombia, a total of 297 vascular plants were previously known from this region. In this study the number was increased by 727 to a new total of 1024 species, which is a considerable increase in our knowledge of plant species richness in dry areas of southern Colombia. Those species are distributed among 556 genera in 130 families. Considering the number of species the following families stand out: Fabaceae (45 genera/119 species), Poaceae (52/101), Asteraceae (56/79), Malvaceae (23/44), Cyperaceae (7/41), Euphorbiaceae (10/39), Lamiaceae (13/31) and Solanaceae (9/31). The genera with the largest number of species are: Solanum (19 especies), Cyperus (16), Euphorbia (14), Hyptis (13), Senna (13), Sida (13), Piper (12), Peperomia (11) and Desmodium (10). Herbs are the predominant life-forms (53.77% of total species) followed by shrubs (24.58%). In the valley, past...

Biota Colombiana

Estudiamos los musgos que crecen en el valle del río Patía, en el suroccidente colombiano, que co... more Estudiamos los musgos que crecen en el valle del río Patía, en el suroccidente colombiano, que comprende zonas de bosque muy seco tropical y bosque seco premontano. En la franja altitudinal comprendida entre 550 y 1500 m s. n. m., encontramos 75 especies de musgos (28 familias y 53 géneros), 34 de ellas acrocárpicas (11 familias y 23 géneros) y 41 pleurocárpicas (17 familias y 30 géneros). Las familias con mayor número de especies son: Bryaceae (10), Pottiaceae (9), Hypnaceae (6), Macromitriaceae (5), Brachytheciaceae (5), Entodontaceae (5), Fissidentaceae (5) y Sematophyllaceae (4). Los géneros mejor representados son Bryum (6), Fissidens (5), Sematophyllum (4) y Entodon (3). El 60 % de las especies se encuentran en un solo tipo de sustrato: suelo (31), corteza (10), materia orgánica (3) y roca (1); el 40 % restante se encuentra en 2 o más sustratos. Bosques, matorrales, taludes y corrientes de agua son los hábitats preferidos por los musgos. Los elementos dominantes son neotropicales extraandinos (35 spp.), cosmopolitas (11), ampliamente tropicales (8) y afroamericanos (5).

A preliminary inventory of vascular plants and the floristic-structural characterization of a sec... more A preliminary inventory of vascular plants and the floristic-structural characterization of a secondary vegetation wooded residual with native and foreign species located in the "Alvaro Jose Negret" Botanical Garden, La Rejoya District, Municipality of Popayan (Cauca, Colombia) is presented. The floristic inventory was made through free collection carried out inside and in the forest outskirts. A total of 182 species, 144 genera and 74 families were registered. 30 species, 20 genera and 15 families were present in Lycophyta and Monilophyta; Polypodiaceae and Blechnaceae (4 species) were the richest families as far as number of species. 152 species, 124 genera, and 59 families were found in Magnoliophyta from which Asteraceae (16 species and 15 genera) and Orchidaceae (13 species and 11 genera) were the most diversified families. All individuals with DAP ≥ 2.54 cm in 10 50 x 10 m bands were sampled to determine the structure and 856 individuals of vascular plants belonging ...

Boletin Cientifico Centro De Museos Museo De Historia Natural, Dec 1, 2013

Biota Colombiana, Dec 15, 2018