Abstract：
:A comparative study was performed between the isozymes 1 and 2b of the L-amino acid oxidase (E.C. 1.4.3.2) from the venom of Bothrops asper snakes captured in Costa Rica. The amino acid composition differs slightly: L-amino acid oxidase-1 (thn most anodal) shows more aspartic and glutamic acid residues than L-amino acid oxidase-2b, which was found to be richer in lysine and alanine residues. Both isozymes had subunits of 60,000 and 57,000 molecular weight, as shown by electrophoresis on SDS polyacrylamide gel. Results of peptide mapping studies are consistent with a high degree of homology between the compared isozymes, and the number of peptides obtained indicated homologous subunits.
journal_name
Rev Biol Tropjournal_title
Revista de biologia tropicalauthors
Umaña Vsubject
Has Abstractpub_date
1982-07-01 00:00:00pages
79-84issue
1eissn
0034-7744issn
2215-2075journal_volume
30pub_type
杂志文章abstract：:Sponges constitute one of the most diverse and abundant animal groups in the marine tropical benthos especially in coral reefs, though poorly studied to species level. The aim of this study is to characterize the sponge community along a depth gradient at Isla Larga (Parque Nacional San Esteban, Venezuela) fringe reef...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2010-10-01 00:00:00
abstract：:Parasites play a crucial role in the ecology of animals. They also appear to be important in mechanisms underlying sexual selection processes. In this article we study the prevalence, effect and potential role in sexual selection of the protozoon Trypanosoma evansi in capybaras, Hydrochoerus hydrochaeris. We collected...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：10.15517/rbt.v64i3.20110
更新日期：2017-03-01 00:00:00
abstract：:The availability of data sets covering more than a year is scarce for tropical environments. Advances in hardware and software speed-up the re-analysis of old data sets and facilitates the identification of hidden data patterns. From February 1984 to April 1987 (49 sampling dates), core samples (17.7cm2, 15cm deep) we...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2011-09-01 00:00:00
abstract：:Seed production, seed dispersal and recruitment are critical processes in population dynamics, because they are almost never completely successful. We recorded the recruitment dynamics for the population of Dipteryx oleifera in a tropical rainforest in eastern Nicaragua (12 degrees 05' N., 83 degrees 55' W.) from Marc...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：10.15517/rbt.v57i1-2.11324
更新日期：2009-03-01 00:00:00
abstract：:We studied seed germination and seedling growth of the Mexican sunflower Tithonia diversifolia in Nigeria. This involved the usage of some dormancy-releasing methods and the effect of some concentrations of three herbicide formulations on the young seedlings. Initial germination tests on fresh and stored seeds reveale...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：10.15517/rbt.v54i2.13881
更新日期：2006-06-01 00:00:00
abstract：:This paper is the first taxonomic account of the hydroid orders Anthoathecatae and Leptothecatae from the Caribbean and Pacific coast of Costa Rica. All specimens are currently stored at the reference collection of the Museo de Zoología, Escuela de Biología, Universidad de Costa Rica. Sixteen hydroid species are recor...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2002-06-01 00:00:00
abstract：:The Mato Grosso is a typical Atlantic Forest stream located on the East coast of Brazil, approximately 70 km from Rio de Janeiro city. From its source at about 800m a.s.l, the stream drains a 30km2 area of the Northwestern part of the municipality of Saquarema, state of Rio de Janeiro and flows into the Saquarema Lago...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：10.15517/rbt.v58i4.5425
更新日期：2010-12-01 00:00:00
abstract：:Anisotremus interruptus is a widely distributed and commercially important species in the Eastern Pacific. A multi-year research on the reproduction of this species was carried out in coastal waters of Jalisco, Mexico. For this purpose, monthly samples were gathered with gillnets of different mesh sizes from 1998-2008...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2012-06-01 00:00:00
abstract：:The effects of sex, injuries, season and site on the growth of the spiny lobsters Panulirus gracilis, and P. inflatus, were studied through mark-recapture techniques in two sites with different ecological characteristics on the coast of Guerrero, México. Panulirus gracilis occurred in both sites, whereas P. inflatus o...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2003-03-01 00:00:00
abstract：:The land crab Gecarcinus quadratus is an engineering species that controls nutrient cycling in tropical forests. Factors regulating their coastal distribution are not fully understood. We quantified land crab distribution during the dry season at Sirena Field Station in Corcovado National Park, Costa Rica, and found t...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：10.15517/rbt.v55i1.6073
更新日期：2007-03-01 00:00:00
abstract：:Egg abundance of Anchoa mitchilli was studied in Laguna de Tamiahua, Veracruz during three annual cycles (84-85, 85-86 and 86-87). Our goal was to detect areas and seasons with high egg abundance and the possible association of such areas and seasons with covariates such as temperature, salinity, transparency, depth, ...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2003-06-01 00:00:00
abstract：:Fishing activity in two artificial reefs (ARs) was monitored between August 2001 and August 2002 in the gulf of Morrosquillo, to investigate their possible impact on the fishery dynamics. We determined catch per unit effort (CPUE) and catch composition, and found 19 species in Punta de Piedra and 36 in Tolú (16 specie...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2009-12-01 00:00:00
abstract：:Thirteen representatives of Myxariaceae sensu Jülich: Heterochaetella brachyspora (Bourdot & Galzin) Luck-Allen, Myxarium atratum (Peck) Ginns & Lefebvre, M. granulum Hauersl., M. laccatum (Bourdot & Galzin) Reid, M. mesomorphum (Bourdot & Galzin) Haursl., M. mesonucleatum Kisim., Oberw. & L.D. Gómez nov. sp., M. subs...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2000-06-01 00:00:00
abstract：:Recognition of the potentially harmful effects of water development in the tropics had led to increasing efforts to assess the environmental impact of such projects prior to construction. Decisions regarding the development or non-development of water resources must be based on sound investigation of both the long-and...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：1976-06-01 00:00:00
abstract：:The structural and ultrastructural features of gonads from endemic Mexican fish have received scarce attention. This study describes the histological and ultrastructural characteristics of oocyte from Chirostoma humboldtianum. The ovary is asynchronic, and as such, most phases of oocyte development are found in the sa...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2008-09-01 00:00:00
abstract：:The diversity, composition and structure of vegetation in a cattle landscape in Matiguás, Nicaragua was characterized, and the floristic and structural differences of six types of habitats (secondary forests, riparian forests, charrales, live fences and pastures with high and low tree cover) were compared. A total of ...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2005-09-01 00:00:00
abstract：:The arguments presented by Espinoza et al. in their paper "Relationship of genetically modified crops with the environment and health of the Costa Rican human population" published in this journal (Rev. Biol. Trop. 52: 727-732, 2004) are questioned and refuted. The arguments are confronted with evidence offered by sci...
journal_title：Revista de biologia tropical
pub_type： 评论,杂志文章
doi：
更新日期：2007-06-01 00:00:00
abstract：:The composition of demersal fish along the western coast of the State of Baja California Sur, Mexico, including the limit of the northern distribution of the ichthyofauna of the eastern tropical Pacific, is presented. The survey was carried out on four oceanographic cruises between autumn 2004 and March 2006. Of 220 s...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2008-12-01 00:00:00
abstract：:Abstract: Histology of gill, liver and kidney in juvenile fish Colossoma macropomum exposed to three temperatures. Water temperature is an important factor that affects growth and antioxidant enzyme activities in fish, and when adverse, it may trigger diseases in fish populations. C. macropomum is a freshwater neotrop...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2013-06-01 00:00:00
abstract：:Ecologists have been largely interested in the description and understanding of the power scaling relationships between body size and abundance of organisms. Many studies have focused on estimating the exponents of these functions across taxonomic groups and spatial scales, to draw inferences about the processes under...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：10.15517/rbt.v64i1.18334
更新日期：2016-03-01 00:00:00
abstract：:The local effects induced as a consequence of applications of four external secretions from the spider Sphaerobothria hoffmanni were recorded. Macroscopic lesions were not found; the only local effect microscopically observed was a weak necrosis in the skeletal muscle in mice. ...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：1984-11-01 00:00:00
abstract：:Sponges have an important ecological role in coral reef ecosystems. However, when compared to other benthic Phyla, it has been little researched. This research was focused in the variability of the community structure of sponges in three locations at Morrocoy National Park (Cayo Sombrero, Playa Mero and Punta Brava) e...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2013-09-01 00:00:00
abstract：:Capturing small carnivores is often necessary for obtaining key ecological data. We compared the efficiency of box and leg-hold traps, using live and dead bait, to capture six carnivore species (Herpailurus yagouaroundi (E. Geoffroyi, 1803), Leopardus tigrinus (Schreber, 1775), Nasua nasua (Linnaeus, 1766), Cerdocyon ...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：10.15517/rbt.v55i1.6083
更新日期：2007-03-01 00:00:00
abstract：:Panulirus gracilis is a high valuable lobster species with considerable captures along the tropical Pacific coast. In this study, I present some biological and fishery parameters described after a sample of 843 lobsters, landed in Playa Lagarto from November 2007 to October 2008. From landing records, a total of 74.9%...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2011-06-01 00:00:00
abstract：:In recent years, the use of new scientific techniques has effectively improved aquaculture production processes. Astaxanthin has various properties in aquaculture and its antioxidant benefits have been closely related to stress resistance; besides, it is an essential factor for growth in many crustaceans and fish. The...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：10.15517/rbt.v62i4.13057
更新日期：2014-12-01 00:00:00
abstract：:The food habits of Trachinotus paitensis, in San Ignacio Lagoon B.C.S., Mexico, were investigated. We observed that T. paitensis is carnivorous, feeding mainly on benthic invertebrates (the gastropods Anachis spp., Bittium spp., and the crustacean larvae). We concluded that T. paitensis is an opportunist predator that...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：10.15517/rbt.v52i1.14762
更新日期：2004-03-01 00:00:00
abstract：:Richness and abundance of birds in riparian forest belts of varied breadths at the Sesesmiles river microwatershed, Copan, Honduras. Riparian forests protect many species of plants and animals. We studied bird communities in riparian forest belts of the Sesesmiles river microwatershed, Copan, Honduras (140 degrees 43'...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2008-03-01 00:00:00
abstract：:Huperzia brevifolia is one of the dominant species of the genus Huperzia living in paramos and superparamos from the Colombian Andes. A detailed study of the sporangium's ontogeny and sporogenesis was carried out using specimens collected at 4200m above sea level, in Parque Natural Nacional El Cocuy, Colombia. Small p...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2009-12-01 00:00:00
abstract：:To demonstrate that T. lewisi infection increases T. gondii multiplication in white rats, groups of five Wistar or Sprague Dawley rats were inoculated with 10(6) T. lewisi trypomastigotes and four or seven days later infected with Toxoplasma tachyzoites. Host survival time was monitored, and the presence of T. gondii ...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：1997-06-01 00:00:00
abstract：:Because of their slow growth, shade-tolerant species remain exposed to foliar damage long before reproductive age. Foliar damage can be controlled through synchronous leaf production and specialized phytochemical strategies. In this study, the dynamics of foliar damage in different cohorts of seedlings were evaluated ...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2008-09-01 00:00:00
