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Search Results: 1 - 10 of 211629 matches for " Pedro N.;Gimenes "
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Daily activity patterns of visits by males of four species of Eulaema (Apidae: Euglossina) to odor baits in a tropical forest fragment in Bahia, Brasil
Melo, Pedro N.;Gimenes, Miriam;Oliveira Neto, Antonio;
Zoologia (Curitiba) , 2009, DOI: 10.1590/S1984-46702009000200002
Abstract: several studies have been conducted with bees of the subtribe euglossina using odor baits as attractants. the objective of this study was to analyze the daily activity pattern of visits by males of four species of eulaema - eulaema nigrita lepeletier, 1841, eulaema flavescens (friese, 1899), eulaema cingulata (fabricius, 1804) and eulaema bombiformis (packard, 1869) - to vanillin and benzyl acetate baits, and their relationship with climatic and environmental factors throughout the day in different months of the year in a tropical forest fragment in bahia. eulaema nigrita was the most frequent species on vanillin baits and e. flavescens was the most frequent species on benzyl acetate baits. the highest frequency of visits was observed in february and december. activities started between 5:00 and 9:00 h. in february and november, visits of e. nigrita to the bait were observed daily, following a bimodal pattern. the same activity pattern was observed for e. bombiformis in december. males of four species of eulaema occurred in all remaining months in a unimodal daily activity pattern, with a higher frequency before 9:30 h. the correlation between the visiting activity to odor baits and climatic factors was low. this result can be due to bee flight activity occurring within a range of adequate climatic variation, particularly temperature, which in our study ranged from 23 to 32oc. daily activity patterns of euglossina males on odor baits can represent patterns of flower fragrance collection under natural conditions, with visits usually at the time of highest production.
Coupling dark-baryonic matter density profile for vacuum decay scenarios
H. T. C. M Souza,H. S. Gimenes,N. Pires
Physics , 2014,
Abstract: In this paper, we reanalysis the cosmological scenery with vacuum decay in dark matter proposed by Wand and Meng. Here, the baryonic matter is also considered as a fluid gravitationally coupled with dark matter. It is made a careful analysis to constrain this model with the observational data of growth rate of cosmic structures. The theoretical growth rate is followed since the primordial recombination and the main physical processes on the baryonic component are considered. As a complementary constraint, this model is compared with the observed CMB-BAO ratio as well with the gas mass fraction o cluster of galaxies. We found the best fit values for dark matter $\Omega_{d0} = 0.269 ^{+0.023}_{-0.023}$ and for the decay parameter $\epsilon = 0.02 ^{+0.04}_{-0.05}$.
Interaction between visiting bees (Hymenoptera, Apoidea) and flowers of Ludwigia elegans (Camb.) hara (Onagraceae) during the year in two different areas in S?o Paulo, Brazil
Gimenes, M.;
Brazilian Journal of Biology , 2003, DOI: 10.1590/S1519-69842003000400008
Abstract: this study was designed to characterize the interactions between ludwigia elegans flowers and visiting bees during two years in two areas 200 km apart, at the same latitude (approximately 22o48's) but at different altitudes (alumínio, 600 m, and campos do jord?o, 1500 m), in the state of s?o paulo, brazil. as these flowers open simultaneously in the morning and lose their petals by sunset, interaction with bees occurs only during the photophase. flowers of l. elegans were mainly visited by bees, the most frequent species being: tetraglossula anthracina (michener, 1989) (colletidae), rhophitulus sp. (andrenidae), and pseudagapostemon spp. (halictidae), all considered specialized bees for collecting pollen and nectar from these flowers, as well as the generalist bee apis mellifera linnaeus, 1758 (apidae). the specialist bees were temporally adjusted to the opening schedule of the flower, which occurs primarily in the morning, but shows a circannual variation. t. anthracina appears in both study areas, but only between december and april. the annual activity patterns of these specialist bees are synchronized to the phenology of l. elegans. photoperiod and temperature cycles are suggested as the main synchronizers of both bees and plants.
Poliniza??o de Vochysia lucida C. Presl (Vochysiaceae) em uma área de restinga na Bahia
Gimenes, Miriam;
Revista Brasileira de Entomologia , 2007, DOI: 10.1590/S0085-56262007000400010
Abstract: vochysia species are neotropical and present flowers that can be visited by bees, hummingbirds, and butterflies. this study aimed to analyze the interactions between the flowers of vochysia lucida and their floral visitors in an area of restinga in bahia state, brazil. v. lucida is an arborescent species and presents inflorescences of the type raceme, with about 100 to 170 flowers. the flowers are zygomorphic, yellow-coloured, and considered mellitophilous. the floral nectar is produced and stored in the spur, which is localized at the calyx. the flowering peak of v. lucida was in november and december. all through the study the flowers opened at 6 h., when the stigma was already receptive. at flower opening the anther was already not more present and the pollen grains were deposited in the wall of the style, occurring secondary presentation of pollen. petals dropped in the end of the afternoon about 17:00 h. the hummingbirds, although frequent in the flowers of v. lucida, were considered as opportunistic visitors. among the recorded floral visitors, the large bees were regarded the most efficient pollinators, especially xylocopa frontalis, because it has suitable morphology and behavior to contact the reproductive structures of the flower, during nectar collections, and for its high visiting frequency.
Interactions between bees and Ludwigia elegans (Camb.) Hara (Onagraceae) flowers at different altitudes in S?o Paulo, Brazil
Gimenes, Miriam;
Revista Brasileira de Zoologia , 2002, DOI: 10.1590/S0101-81752002000300005
Abstract: populations of ludwigia elegans (carnb.) hara were examined in aluminio (600m) and campos do jord?o (1520m), in the state of s?o paulo. flowers of both populations are self-incompatible and dependent on bees for pollination. flowers of ludwigia elegans at the aluminio site were visited by about 30 different species of bees, and those at campos do jord?o by 10. these results can be related to climatic differences at the two sites, especially temperature, due to their difference in altitude. inspite of the difference in the absolute number of bee species seen at each site, tetraglossula anthracina (michener, 1989) (colletidae) can be considered a specialized and efficient pollinator in both areas, since it visited these flowers frequently and showed many morphological and behavioral adaptations for pollen and nectar collection.
Interaction between visiting bees (Hymenoptera, Apoidea) and flowers of Ludwigia elegans (Camb.) hara (Onagraceae) during the year in two different areas in S o Paulo, Brazil
Gimenes M.
Brazilian Journal of Biology , 2003,
Abstract: This study was designed to characterize the interactions between Ludwigia elegans flowers and visiting bees during two years in two areas 200 km apart, at the same latitude (approximately 22o48'S) but at different altitudes (Alumínio, 600 m, and Campos do Jord o, 1500 m), in the State of S o Paulo, Brazil. As these flowers open simultaneously in the morning and lose their petals by sunset, interaction with bees occurs only during the photophase. Flowers of L. elegans were mainly visited by bees, the most frequent species being: Tetraglossula anthracina (Michener, 1989) (Colletidae), Rhophitulus sp. (Andrenidae), and Pseudagapostemon spp. (Halictidae), all considered specialized bees for collecting pollen and nectar from these flowers, as well as the generalist bee Apis mellifera Linnaeus, 1758 (Apidae). The specialist bees were temporally adjusted to the opening schedule of the flower, which occurs primarily in the morning, but shows a circannual variation. T. anthracina appears in both study areas, but only between December and April. The annual activity patterns of these specialist bees are synchronized to the phenology of L. elegans. Photoperiod and temperature cycles are suggested as the main synchronizers of both bees and plants.
Contribui es de um grupo de estudos para a forma o matemática de professoras que lecionam nas séries iniciais
Jucelene Gimenes
Bolema: Boletim de Educa??o Matemática , 2008,
Abstract:
Managing Macular Holes in a Developing Economy  [PDF]
Bassey Fiebai, Chinyere N. Pedro-Egbe
Open Journal of Ophthalmology (OJOph) , 2015, DOI: 10.4236/ojoph.2015.53021
Abstract: Background: Macular holes are the common cause of visual impairment especially in the elderly and have a variety of etiological factors. The advances in the management of macular holes are encouraging and are now available in developing countries although scarce, where hitherto; patients seek attention outside their country. The need to understand this disease has therefore become pertinent in all retina clinics. Objective: To evaluate the pattern of presentation of macular holes and its management in a retina clinic in South South Nigeria. Methods: A 5 year retrospective, non comparative review of 24 consecutive cases presenting to a retinal clinic was carried out. Relevant information was extracted from the medical records and analyzed. Results: Three hundred and sixty four cases were seen between January 2009 and December 2013. Twenty four cases had macular holes and ten (41.7%) had bilateral presentation with a total of 34 eyes. The incidence of macular holes was 6.6%. The mean age was 46 years (SD ± 13.42) with a female preponderance, 5:1. Idiopathic holes formed the bulk of the cases 14(58.3%); others were trauma 4(16.7%), posterior uveitis 2, (8.3%), chemotherapy 2 (8.3%), Solar retinopathy and retinitis pigmentosa 1 (4.2%). Nineteen (55.9%) of the 34 eyes were visually impaired (BCVA <6/18). Nineteen eyes had full thickness holes (55.9%) requiring surgery, however only 3(12.5%) of these could afford to have surgery with one reoperation. Four patients (16.7%) had complications in form of retinal detachments at presentation. Conclusion: This study has shown that the incidence of macular holes in the developing world is significant and resources to manage these cases are grossly lacking. Specialist training, with government subsidizing costs will alleviate these difficulties and reduce visual loss from macular holes.
Atividades relacionadas à constru??o e aprovisionamento de ninhos de Xylocopa subcyanea (Hymenoptera, Apidae) em uma área de restinga na Bahia, Brasil
Gimenes, Miriam;Figueiredo, Nívia A.;Santos, Andreza H. P. dos;
Iheringia. Série Zoologia , 2006, DOI: 10.1590/S0073-47212006000300005
Abstract: bees of the genus xylocopa latreille, 1802 are frequent in sandbank ecosystems under accelerated degradation. they nest especially in dead or rotted wood. the nest construction and nest structure of xylocopa (schoenherria) subcyanea perez, 1901 were studied in a sandbank from bahia's north littoral, brazil. we observed 43 active nests, under different stages of development, in two dead logs. the main activities were excavation of the logs, entering and leaving nest, permanence in the nest entrance, entering with pollen, and nectar dehydration. preferential times along the day were observed for entering and leaving nest, showing influence of sunrise and sunset times. abandoned nests were reused by x. subcyanea and centris tarsata smith, 1874. active nests were occupied by four different adult bees. an individual frequently stayed at nest entrance, adopting a defensive behavior. the nest structure was described.
The role of micro-ribonucleic acids in normal hematopoiesis and leukemic T-lymphogenesis
Slavov, S.N.;Gimenes Teixeira, H.L.;Rego, E.M.;
Brazilian Journal of Medical and Biological Research , 2010, DOI: 10.1590/S0100-879X2010007500057
Abstract: micro-ribonucleic acids (micrornas) are small molecules containing 20-23 nucleotides. despite their small size, it is likely that almost every cellular process is regulated by them. moreover, aberrant microrna expression has been involved in the development of various diseases, including cancer. although many data are available about the role of micrornas in various lymphoproliferative disorders, their impact on the development of acute lymphoblastic leukemia of t-cell progenitors is largely unknown. in this review, we present recent information about how specific micrornas are expressed and regulated during malignant t-lymphopoiesis and about their role during normal hematopoiesis.
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