Listar Biología por título
Mostrando ítems 1133-1152 de 1643
-
Pharmacological activities of a toxic phospholipase A isolated from the venom of the snake Bothrops asper
(1986)A toxic phospholipase A was isolated from the venom of Bothrops asper. It induced skeletal muscle damage, anticoagulant effects and edema in the foot pad. The toxin had an intravenous LD50 of 95 micrograms/16-18 g mouse ... -
Phenology of an urban population of Lyssomanes jemineus Peckham & Wheeler (Araneae: Salticidae) with a list of other jumping spiders from the same Costa Rican site
(2019)Jumping spiders were sampled for 24 months in a Costa Rican urban environment and one of the species collected, Lyssomanes jemineus, was observed in detail in order to document its phenology in this disturbed habitat. ... -
Phenology of myxomycetes in Turrialba, Costa Rica
(2021-05)Long-term monitoring and phenological patterns of microbial communities are rare in the scientific literature. Myxomycetes have life cycle characteristics that allow both to be documented. The present study summarizes ... -
Phenotypic variation and vocal divergence reveals a species complex in White-eared Ground-sparrows (Cabanis) (Aves: Passerellidae)
(2017-07-11)The taxonomy of the genus Melozone has recently been analyzed from genus to subspecies level, leading to a significant revision of our understanding of this group of birds. Previous studies quantified differences in ... -
Phospholipase C and sphingomyelinase activities of the Clostridium perfringens Alfa-toxin
(Chemistry and Physics of Lipids, 2009-02)Alfa-Toxin is a major pathogenic determinant of Clostridium perfringens, the causative agent of gas gangrene. Alfa-Toxin has been known for long to be a phospholipase C, but up to now its hydrolytic properties have been ... -
Photobiochemical changes in Chlorella g120 culture during trophic conversion (metabolic pathway shift) from heterotrophic to phototrophic growth regime
(2020)Physiological and photobiochemical changes and growth in the heterotrophic strain Chlorella vulgaris g120 were studied during trophic conversion from heterotrophic to phototrophic growth regime. After the exposure of the ... -
Photochemical efficiency of adult and young leaves in the neotropical understory shrub Psychotria limonensis (Rubiaceae) in response to changes in the light environment
(Revista de Biologia Tropical 52 (4): 839-844, 2004-12)We explored the short-term adjustment in photochemical efficiency (Fv/Fm) in adult and young leaves of the understory neotropical shrub Psychotria limonensis Krause (Rubiaceae) in response to rapid changes in the light ... -
Photosynthetic characterization of two Nannochloropsis species and its relevance to outdoor cultivation
(2020)Despite the increased interest in exploring the potential of algal biomass production for food stock and renewable energy, very little work has been done in developing reliable screening protocols to enable the identification ... -
Phragmipedium (Pfitz.) Rolfe
(2020)The nomenclature of the tropical American lady-slippers has been somewhat confused. At first, the species were named as species of Cypripedium, a name now used only for a north temperate group of terrestrial species. ... -
Phragmipedium humboldtii (Warsz.) J.T. Atwood & Dressler: on the correct name for the Central American long-petaled Phragmipedium; again
(2016)I was quite convinced that the complicated taxonomic history of the Central American long-petaled Phragmipedium, which has been misunderstood for over a century and caused a lot of uncertainties among both professional ... -
Phragmipedium longifolium
(2018)Epiphytic, caespitose herb, up to 50 cm tall including the inforescence. Leaves linear to lanceolate, glabrous, margins fnely revolute, emarginate, minutely apiculate, oblique, 15–45 × 2–5 cm. Inforescence a spicate raceme, ... -
Phylogenetic analysis of Andinia (Pleurothallidinae; Orchidaceae) and a systematic re-circumscription of the genus
(2017)Most of the species studied in this paper have previously been placed in either Pleurothallis or Lepanthes. However, at one time or another, members of the group have also been placed in the genera Andinia, Brachycladium, ... -
Phylogenetic analysis of ITS data from endophytic fungi using massive parallel bayesian tree inference with exabayes
(2020-03-27)Ecological studies of fungal communities have been favored thanks to the emergence and improvement of independent culture techniques that use the ITS region as a molecular marker. This has allowed a more accurate identification ... -
Phylogenetic and Functional Diversity of Saprolegniales and Fungi Isolated from Temperate Lakes in Northeast Germany
(2021-11-13)The contribution of fungi to the degradation of plant litter and transformation of dissolved organic matter (humic substances, in particular) in freshwater ecosystems has received increasing attention recently. However, ... -
Phylogenetic comparative methods improve the selection of characters for generic delimitations in a hyperdiverse Neotropical orchid clade
(2019)Taxonomic delimitations are challenging because of the convergent and variable nature of phenotypic traits. This is evident in species-rich lineages, where the ancestral and derived states and their gains and losses are ... -
Phylogenetic reassessment of Acianthera (Pleurothallidinae: Orchidaceae)
(2016-12-31)The phylogenetic relationships within the Acianthera affinity are re-evaluated using Bayesian analyses of nrITS and chloroplast matK sequence data. Emphasis is made on species from the Antilles, Central America and the ... -
Phylogenetic reassessment of Specklinia and its allied genera in the pleurothallidinae (Orchidaceae)
(2016)The phylogenetic relationships within Specklinia (Pleurothallidinae; Orchidaceae) and related genera are re-evaluated using Bayesian analyses of nrITS and chloroplast matK sequence data of a wide sampling of species. ... -
Phylogenetic Relationships of Rhizobia Based on Citrate Synthase Gene Sequences
(2004)Partial nucleotide sequences of the citrate synthase (gltA) gene from different rhizobia genera were determined. Tree topologies based on this housekeeping gene were similar to that obtained using 16S rRNA sequences. However ... -
Phylogenetic systematics of subtribe Spiranthinae (Orchidaceae: Orchidoideae: Cranichideae) based on nuclear and plastid DNA sequences of a nearly complete generic sample
(2018)Subtribe Spiranthinae is the most species-rich lineage of terrestrial Neotropical orchids, encompassing > 500 species and 40 genera. We conducted maximum parsimony and maximum likelihood phylogenetic analyses of DNA sequence ... -
Phylogenetic utility of ycf1 in orchids: a plastid gene more variable than matK
(2008-11-12)Plastid DNA sequences have been widely used by systematists for reconstructing plant phylogenies. The utility of any DNA region for phylogenetic analysis is determined by ease of amplification and sequencing, confidence ...