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Chemical and Biological Activity of Leaf Extracts of Chromolaena leivensis

Torrenegra G., Ruben D.; Rodríguez A., Oscar E. (2011)

The flavonoids 3,5-dihydroxy-7-methoxy-flavanone, 3,5-dihydroxy-7-methoxyflavone and 3,5,7-trihydroxy-6-methoxyflavone were isolated from the leaves of C. leivensis. Preliminary observations in K562 cells (human erythroleukemia) ...
New records of the Western Rounded Ear Bat, Lophostoma occidentalis (Davis & Carter, 1978) (Chiroptera: Phyllostomidae), from Colombia

Vasquez, Anatoly Marin; Ramírez Chaves, Héctor E.; Rivas Pava, Pilar; Mantilla Meluk, Hugo (2015-01)

We report new records of the western rounded ear bat Lophostoma occidentalis for the Colombian territory, rep-resented by ten specimens collected on the western portion of the country, in the departments of ...
Otolith eco-morphological patterns of benthic Fishes from the coast of valencia (spain)

Jaramillo, Angela M.; Tombari, Andrea D.; Benedito Dura, Vicent; Rodrigo, Maria Eugeni; Volpedo, Alejandra V. (2014)

Los peces bentónicos presentan diferentes estrategias de adaptación y diferentes grados de asociación con el sustrato. El objetivo de este estudio es describir las características morfológicas y morfométricas de otolitos ...

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Chemical and Biological Activity of Leaf Extracts of Chromolaena leivensis
...
Torrenegra G., Ruben D. | 2011

The flavonoids 3,5-dihydroxy-7-methoxy-flavanone, 3,5-dihydroxy-7-methoxyflavone and 3,5,7-trihydroxy-6-methoxyflavone were isolated from the leaves of C. leivensis. Preliminary observations in K562 cells (human erythroleukemia) using the trypan blue test, showed a 90% viability at a concentration of 100 µg/mL; however, further testing of the flavonoids at concentrations of 25, 50 and 100 µg/mL showed toxicity affecting the morphology of human erythroleukemia cells (K562) and human melanoma cells (A375). Induction of apoptosis was produced by 3.5-dihydroxy-7-methoxyflavone at 72 hours after treatment with arrest in the G2 / M phase of the cell cycle. The A375 cells treated with 50 µg/mL of 3.5-dihydroxy-7-methoxy-flavanone for 24, 48 and 72 hours, display effects on the behavior of the cell cycle. The flavonoid 3,5-dihydroxy-7-methoxyflavone has activity on the mitochondrial membrane at concentrations of 25, 50 and 100 µg/mL, at time intervals of 8 to 12 hours. The flavonoids 3,5-dihydroxy-7-methoxy-flavanone and 3,5-dihydroxy-7-methoxyflavone at a concentration of 25 µg/mL increased the expression of costimulatory molecules corresponding to the phenotype presented by mature dendritic cells with differentiation markers CD40, CD83, CD86 and HLA-DR. The two flavonoids at concentrations between 0.39 and 100 µg/mL slightly increased the proliferation of peripheral blood mononuclear cells in the presence and in the absence of phytohemagglutinin. These flavonoids at concentrations of 50 and 100 µg/mL slightly increased the proliferation of fibroblasts.

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New records of the Western Rounded Ear Bat, Lophostoma occidentalis (Davis & Carter, 1978) (Chiroptera: Phyllostomidae), from Colombia
...
Vasquez, Anatoly Marin | 2015-01

We report new records of the western rounded ear bat Lophostoma occidentalis for the Colombian territory, rep-resented by ten specimens collected on the western portion of the country, in the departments of Cauca, Chocó, and Valle del Cauca, all in the Colombian Pacific Region. The new re-cords of L. occidentalis represent a substantial geographic and ecological extension in the known distribution of this species and corroborate its occurrence in Colombia. In addition, we discuss on the morphological variation of representatives of large Lophostoma species in Colombia.

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Otolith eco-morphological patterns of benthic Fishes from the coast of valencia (spain)
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Jaramillo, Angela M. | 2014

Los peces bentónicos presentan diferentes estrategias de adaptación y diferentes grados de asociación con el sustrato. El objetivo de este estudio es describir las características morfológicas y morfométricas de otolitos de cuatro especies de peces bentónicos de la costa de Valencia y estudiar la relación entre estas caracterisitcas de los otolitos con el sustrato. Las sagittae analizadas pertenecen a las siguientes especies: Scorpaena scrofa Linnaeus, 1758 (N = 40), Mullus surmuletus Linnaeus, 1758 (N = 29), Uranoscopus scaber Linnaeus, 1758 (N = 24) y Synaptura lusitanica Capello, 1868 (N = 121). Los peces fueron sexados, se midió la longitud total (lt) en mm, y las sagittae fueron extraídas para examinar su morfología y morfometría. Se calculó el índice E (= ancho máximo de los otolitos (OW) / máxima longitud del otolito (OL) %) y S (superficie del sulcus (SS) / superficie del otolito (OS) %). El índice morfométrico E mostró una tendencia hacia una forma alargada o circular y el índice S mostró una tendencia de la mácula nerviosa a tener una mayor superficie de captación de información para transmitir al cerebro del pez. El análisis de la morfología y morfometría de los otolitos reveló la existencia de diferentes patrones eco-morfológicos asociados con el uso del hábitat y el tipo de sustrato donde los peces se encuentran con mayor frecuencia. Los índices E y S han demostrado ser útiles para discriminar entre las sagittae de peces que hacen un uso diferencial de la columna de agua y que están asociados a diferentes tipos de sustratos.

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Browsing by Subject "morfología"

Chemical and Biological Activity of Leaf Extracts of Chromolaena leivensis ﻿

New records of the Western Rounded Ear Bat, Lophostoma occidentalis (Davis & Carter, 1978) (Chiroptera: Phyllostomidae), from Colombia ﻿

Otolith eco-morphological patterns of benthic Fishes from the coast of valencia (spain) ﻿

Envíos recientes

Chemical and Biological Activity of Leaf Extracts of Chromolaena leivensis

New records of the Western Rounded Ear Bat, Lophostoma occidentalis (Davis & Carter, 1978) (Chiroptera: Phyllostomidae), from Colombia

Otolith eco-morphological patterns of benthic Fishes from the coast of valencia (spain)

Chemical and Biological Activity of Leaf Extracts of Chromolaena leivensis

New records of the Western Rounded Ear Bat, Lophostoma occidentalis (Davis & Carter, 1978) (Chiroptera: Phyllostomidae), from Colombia

Otolith eco-morphological patterns of benthic Fishes from the coast of valencia (spain)