Results 171 to 180 of about 5,027 (193)
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An Extract From the Bark of Aspidosperma Quebracho Blanco Binds to Human Penile ??-Adrenoceptors
The Journal of Urology, 2002We determined whether an extract from the bark of the tree Aspidosperma quebracho blanco, which is used as a prescription drug to treat erectile dysfunction in some countries, can bind to human penile alpha1 and alpha2-adrenoceptors, and cloned human alpha-adrenoceptor subtypes.Competition binding studies were performed with alpha1 and alpha2 ...
Sperling, Herbert +4 more
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Forest Ecology and Management, 1999
The Aspidosperma quebracho-blanco is an important sclerophyllous evergreen species of the Argentine Chaco. There is scarce information about demographic patterns of A. quebracho blanco in the Arid Chaco. This paper focused on describing consequences of the process of degradation of the vegetation on the regeneration and size structure of A.
Alicia H Barchuk +1 more
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The Aspidosperma quebracho-blanco is an important sclerophyllous evergreen species of the Argentine Chaco. There is scarce information about demographic patterns of A. quebracho blanco in the Arid Chaco. This paper focused on describing consequences of the process of degradation of the vegetation on the regeneration and size structure of A.
Alicia H Barchuk +1 more
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International Journal of Plant Sciences, 1999
Flower structure, attractants, breeding system, and visitors were studied in Aspidosperma quebracho-blanco, a South American mass-flowering tree with simple moth-pollinated flowers and without floral reward. Flowers are protandrous, having an initial male phase for 2 d. The pendulous and horizontal flower position and protandry prevent self-pollination.
, Lin, , Bernardello
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Flower structure, attractants, breeding system, and visitors were studied in Aspidosperma quebracho-blanco, a South American mass-flowering tree with simple moth-pollinated flowers and without floral reward. Flowers are protandrous, having an initial male phase for 2 d. The pendulous and horizontal flower position and protandry prevent self-pollination.
, Lin, , Bernardello
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Austral Ecology, 2006
Abstract Aspidosperma quebracho‐blanco is found throughout the Chaco (17°−33°S) in Argentina, and it is the dominant tree species in the arid Chaco. Under the hypothesis that morpho‐physiological features of A. quebracho‐blanco change as a function of its geographical position on a water deficit gradient, it was predicted that with increasing water ...
ALICIA H. BARCHUK +1 more
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Abstract Aspidosperma quebracho‐blanco is found throughout the Chaco (17°−33°S) in Argentina, and it is the dominant tree species in the arid Chaco. Under the hypothesis that morpho‐physiological features of A. quebracho‐blanco change as a function of its geographical position on a water deficit gradient, it was predicted that with increasing water ...
ALICIA H. BARCHUK +1 more
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2017
Effective management and conservation of a biological population requires knowledge of the different phases of its life cycle. We present data on seed production of quebracho blanco (white quebracho), Aspídosperma quebracho-blanco, a key tree species in the Chaco ecosystem of South America.
Tálamo, Andrés +2 more
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Effective management and conservation of a biological population requires knowledge of the different phases of its life cycle. We present data on seed production of quebracho blanco (white quebracho), Aspídosperma quebracho-blanco, a key tree species in the Chaco ecosystem of South America.
Tálamo, Andrés +2 more
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Journal of Pharmaceutical Sciences, 1973
Abstract A continuing investigation of the leaves of Aspidosperma quebracho-bianco Schlecht. (Apocynaceae) has resulted in the isolation of natural acetylakuammidine, in addition to the previously reported alkaloids aspidospermine and quebrachidine. Methods used for the isolation and characterization of these bases are described.
R L, Lyon, H H, Fong, N R, Farnsworth
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Abstract A continuing investigation of the leaves of Aspidosperma quebracho-bianco Schlecht. (Apocynaceae) has resulted in the isolation of natural acetylakuammidine, in addition to the previously reported alkaloids aspidospermine and quebrachidine. Methods used for the isolation and characterization of these bases are described.
R L, Lyon, H H, Fong, N R, Farnsworth
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Austral Ecology, 2008
Abstract The survival of Aspidosperma quebracho‐blanco juveniles in the Arid Chaco is facilitated under the canopy of nurse plants. The possible effects of nurse plants were studied at intra‐ and interspecific levels by analysing the spatial distribution of juveniles and adults of A.
ALICIA H. BARCHUK +2 more
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Abstract The survival of Aspidosperma quebracho‐blanco juveniles in the Arid Chaco is facilitated under the canopy of nurse plants. The possible effects of nurse plants were studied at intra‐ and interspecific levels by analysing the spatial distribution of juveniles and adults of A.
ALICIA H. BARCHUK +2 more
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Radial wood variation in some anatomical features in Aspidosperma quebracho blanco
2001Radial wood variation patterns of Aspidosperma quebracho blanco, one of the most important species of the Dry Chaco Region, and their influence on wood quality are reported in this study. Pattern variations of wood density, frequency and diameter of pore vessels and fiber length were examined using sites, trees and radial distances as sources of ...
Moglia, Juana Graciela +1 more
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Revista iberoamericana de micologia, 2007
Aspidosperma quebracho-blanco (white quebracho) and Schinopsis balansae (red quebracho) are distinctive trees of the South American Park in Argentina. Quebrachos are found in forests that have been exploited very intensively. The object of this work was the identification of biotic and abiotic factors specially fungal pathogen that affect the quality ...
Claudia, Alzugaray +3 more
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Aspidosperma quebracho-blanco (white quebracho) and Schinopsis balansae (red quebracho) are distinctive trees of the South American Park in Argentina. Quebrachos are found in forests that have been exploited very intensively. The object of this work was the identification of biotic and abiotic factors specially fungal pathogen that affect the quality ...
Claudia, Alzugaray +3 more
openaire +1 more source