Abstract：
:Different features of the satellite associations between the acrocentric chromosomes of 100 postpartum mothers, between 14 and 43 years of age, and 100 neonates (51 males and 49 females) from Puriscal, Costa Rica, were compared (400 cells were examined, 2 from each individual). Several types of satellite associations showed higher frequencies in the mothers than in the neonates. The associations most frequently found in the two groups were those of two chromosomes, followed by those of three chromosomes. The D/G ratio was 1.43 in the children and 1.40 in the mothers. The number of associations per cell in the mothers was almost twice that of the children. The mean number of acrocentric chromosomes per association was 2.2 in the children and 2.35 in the mothers. No significant difference was found between observed and expected values of D and G chromosomes in the two groups. Thus, the probable factors responsible for the increase of satellite associations in the mothers similarly influenced the two types of acrocentric chromosomes.
journal_name
Rev Biol Tropjournal_title
Revista de biologia tropicalauthors
Solís Vsubject
Has Abstractpub_date
1985-06-01 00:00:00pages
51-6issue
1eissn
0034-7744issn
2215-2075journal_volume
33pub_type
杂志文章abstract：:A study of the 1963-1965 eruptions of the Irazú volcano (Costa Rica) showed that the ashes altered the ecological conditions of a great number of insects. Experiments suggest a mechanical action of the abrasive particles on the epicuticle, making it permeable, and thus accelerating dehydration. Other insects, such as ...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：1975-12-01 00:00:00
abstract：:The euglossine bee Eulaema nigrita plays an important role for the pollination of native and economically important plants, such as the sweet passion-fruit Passiflora alata. E. nigrita uniquely collects the nectar from the flowers of P. alata, nevertheless, it needs to visit other plants to collect pollen, nectar and ...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：10.15517/rbt.v60i4.2073
更新日期：2012-12-01 00:00:00
abstract：:Cattleya trianae is an endemic species from the tropical rainforest in the Colombian Andes. Its survival is currently threatened due to habitat loss and commercial overexploitation. This study evaluates ten substrates, some organic (pine bark, coconut fiber and wood shavings), some inert icopor (polystyrene foam), veg...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：10.15517/rbt.v55i2.6045
更新日期：2007-06-01 00:00:00
abstract：:Lichens are increasingly used worldwide as air quality biomonitors because they are efficient, easy and cheap, but validation studies of the methodology are scarce. Three foliose lichen biomonitoring methods were compared by field tests (in the tropical urban habitat of San José, Costa Rica) and laboratory simulations...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2002-03-01 00:00:00
abstract：:We studied fruit availability, diet and habitat use by white-lipped peccary (Tayassu pecari) in Corcovado National Park, southwest Costa Rica, from July 1996 to April 1997. The results show that the availability of important fruits for the white-lipped peccary differs between habitats and climatic seasons. Fruit avail...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2001-09-01 00:00:00
abstract：:Fish are important ecological components in tropical coastal lagoons. In order to evaluate the distribution and feeding preferences of the toadfish Opsanus phobetron in the Chelem Lagoon, Yucatan, Mexico, fish samples were collected using a beach seine in eight stations distributed randomly, from March 2002 to January...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2007-09-01 00:00:00
abstract：:The impacts of forest fragmentation on both reproductive biology and genetic diversity of native plant species is hardly understood, despite some studies have analyzed this current worldwide problem. Since this constitutes one of the main threats to seasonal semi-deciduous forests in Southeastern Brazil, we investigat...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2014-03-01 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：:The fertility life table of Podisus nigrispinus (Dallas) (Heteroptera: Pentatomidae) preying either on Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) caterpillars or on alternative prey Tenebrio molitor L. (Coleoptera: Tenebrionidae) under greenhouse conditions (30 +/- 5 degrees C, 61 +/- 23% RH) were studied. The...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2002-03-01 00:00:00
abstract：:The study of sexual reproductive behavior supported by ultrastructural evidence is important in rotifers to describe differences among potential cryptic species. In this research, the morphology of the rotifer Brachionus bidentatus is described at the ultrastructural level, using electronic microscopy, together with a...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2013-12-01 00:00:00
abstract：:Two types of inclusion bodies were consistently observed under light microscopy in bean (Phaseolus vulgaris) leaf tissue infected with Bean rugose mosaic virus (BRMV), a species of the genus Comovirus, family Comoviridae. One type consisted of vacuolated inclusions found mainly in the cytoplasm of epidermal cells. The...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2000-12-01 00:00:00
abstract：:Biomarkers are a widely applied approach in environmental studies. Analyses of cholinesterase (ChE), glutathione S-transferase (GST) and lipid peroxidation (LPO) are biomarkers that can provide information regarding early effects of pollutants at different biochemical levels on an organism. The aim of this study was t...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：10.15517/rbt.v60i1.2769
更新日期：2012-03-01 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：:Bottom trawling has been considered a fishing activity that affects and modifies habitats, because of its impacts in species composition and abundance, and the alteration in the structure and function of the eco-system, that generates biodiversity loss. The Northern part of the Gulf of California has been considered a...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2015-09-01 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：:The contributions published in Revista de Biología Tropical in the area of Biomedical Sciences are reviewed in terms of number of contributions and scope of research subjects. Biomedical Sciences, particularly Parasitology and Microbiology, constituted the predominant subject in the Revista during the first decade, re...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2002-09-01 00:00:00
abstract：:The sea urchin Lytechinus variegatus is of some commercial importance on the Southern coast of Margarita Island (Venezuela), where artisan women fishers process and sell the roe. The reproduction cycle of this species had not been fully studied. We collected these sea urchins in two stations from November 1997 through...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2005-12-01 00:00:00
abstract：:Habitat modifications such as deforestation and the increase of agricultural activities, have led to uncommon faunal interactions. In Colombia, this condition have caused the secondary contact of subspecies of Ramphocelus flammigerus populations from Cauca valley and the Pacific coast; and some specimens with rumps of...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2012-03-01 00:00:00
abstract：:A conductivity staining method for tissue samples were developed using a solution of 10 ml of 5% carbolic acid solution, 2 g of tannic acid, and 10 ml of saturated aluminium sulfate 12-hydrated after fixation with osmium. Specimens of kidney (mouse) with the above treatment can be analyzed under a scanning electron mi...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：1994-08-01 00:00:00
abstract：:Size and fecundity observations of pea crab (Juxtafabia muliniarum) from the paleal cavity of the oyster Saccostrea palmula were made from May 1998 to May 1999. Infestation frequency was 18.52% in a sample of 540 oysters. Of 136 pea crabs, 36% were couples, 60% were single females and 4% were single males. The mean ca...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2001-09-01 00:00:00
abstract：:Deforestation of tropical forests is threatening monkey biodiversity and their health status, dependent of an ecologically undisturbed area. To asses this relationship, we analyzed parasite occurrence in their intestines. The study was conducted at the Estación Biológica La Suerte (EBLS), Limón, Costa Rica. The group ...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2010-12-01 00:00:00
abstract：:Migrating humpback whales from northern and southern feeding grounds come to the tropical waters near Osa Peninsula, Pacific of Costa Rica, to reproduce and raise their calves. Planning effective marine protected areas that encompass humpback critical habitats require data about which oceanographic features influence ...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：10.15517/rbt.v56i2.5610
更新日期：2008-06-01 00:00:00
abstract：:The diet ofa neotropical fish species (Creagrutus bolivari) was studied using different methods: the Cortés 1997 graphic method and two relative importance indexes, one designed by George and Hadley in 1979 (% RIi) and another proposed by Cortés in 1997 (% IRIi). Only discrete prey (aquatic and terrestrial invertebrat...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2006-12-01 00:00:00
abstract：:In India, freshwater environments are experiencing serious threats to biodiversity, and there is an urgent priority for the search of alternative techniques to promote fish biodiversity conservation and management. With this aim, the present study was undertaken to assess the fish biodiversity within and outside a riv...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：10.15517/rbt.v61i1.10942
更新日期：2013-03-01 00:00:00
abstract：:Age and growth of Nile tilapia (Oreochromis niloticus) were determined using 1039 specimens collected in a tropical shallow lake of Mexico, from January to December 1993. Standard length of females ranged from 9.0 to 16.5 cm and males from 8.9 to 14.8 cm. The standard length-weight relationships for all individuals wa...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：10.15517/rbt.v56i2.5630
更新日期：2008-06-01 00:00:00
abstract：:The reproductive season of tilapia was studied by monthly samplings at Emiliano Zapata dam, Morelos State, Mexico. From February 1999 through February 2000 a sample of 50 fish was taken from the commercial catch (castnet, 6.5 cm of mesh size). The observed sex ratio was 1:1.29 (females:males) (chi(2)=10.26; p<0.05). T...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：10.15517/rbt.v53i3-4.14666
更新日期：2005-09-01 00:00:00
abstract：:We studied the composition and seasonal variation of the diet of the capybara (Hydrochaeris hydrochaeris) in the flooded savannas of Caño Limón, Colombia. This was achieved by direct observation of the consumption patterns of these animals. The capybaras only consumed plants, and their diet included 89 species of 22 f...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2003-06-01 00:00:00
abstract：:We analyzed the diet and feeding habits of the fishes Heterandria bimaculata and Poecilia sphenops. Specimens were captured monthly in "Los Carros" damp, Morelos, Mexico (18 degrees 37' N, 98 degrees 43' W). We quantified gut content by the numerical method and by the frequency of occurrence method; and used the MacAr...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2007-06-01 00:00:00
abstract：:A review of leukemia worldwide is discussed, focusing on etiology, diagnosis and treatment. The history of research of this type of cancer in Costa Rica is presented through the first hospital diagnosis, the arrival of clinical and laboratory hematologists, the establishment of specialized laboratories, the local hema...
journal_title：Revista de biologia tropical
pub_type： 杂志文章,评审
doi：
更新日期：2004-09-01 00:00:00
abstract：:Estimating feline abundance becomes particularly difficult, sometimes impossible, due to their elusive behavior and extensive space requirements. Available techniques are expensive and/or poorly efficient, therefore alternative methods are needed. The objective of this study was to assess the possibility of identifyin...
journal_title：Revista de biologia tropical
pub_type： 杂志文章
doi：
更新日期：2008-12-01 00:00:00
