Abstract:
:Fifty specimens of five strains (10 per strain) of Helisoma duryi from Lima (Peru), St. Croix (Virgin Islands), Formosa (Brazil), Cartago (Costa Rica) and St. Vincent (Lesser Antilles), reared in isolation for about 150 days, laid 103 eggs. The numbers of eggs laid by the 10 specimens of each strain were respectively (viable eggs in parenthesis): 44 (26), 1 (1), 5 (0), 15 (7) and 38 (0). Egg production widely varied between the individuals of each strain, there being in all strains, except St. Vincent, a number of specimens (3 to 9) which did not lay any eggs. After the observation period the isolated specimens, including those that laid no eggs, readily engaged in cross-breeding when mated and brought forth large numbers of eggs. Self-fertilized F1S are fully interfertile, producing normal cross-fertilized offspring. Ten specimens of Helisoma trivolvis (strain from Zempoala, Mexico), also reared in isolation for about 120 days, laid 646 eggs, of which 74 were inviable. Our data, added to those from a few previous studies cited in the text, show that self-fertilization is not so efficient an alternative mode of reproduction in H. duryi as in many other planorbids (it is a little more efficient in H. trivolvis than in H. duryi). Thus, H. duryi benefits much less from functional hermaphroditism which, besides other advantages, enables a single virgin individual to found a new population.
journal_name
Mem Inst Oswaldo Cruzjournal_title
Memorias do Instituto Oswaldo Cruzauthors
Paraense WL,Corrêa LRdoi
10.1590/s0074-02761988000400002subject
Has Abstractpub_date
1988-10-01 00:00:00pages
405-9issue
4eissn
0074-0276issn
1678-8060pii
S0074-02761988000400002journal_volume
83pub_type
杂志文章abstract::In a recent issue of Memórias do Instituto Oswaldo Cruz, published in Rio de Janeiro in February 2014 (109: 87-92), Adami et al. have published a survey reporting Mansonella parasite prevalence in the Amazon Region. This report makes a useful contribution to the existing knowledge of filarial parasite distribution wit...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/0074-0276140079
更新日期:2014-07-01 00:00:00
abstract::The mechanisms that facilitate the adaptation of Trypanosoma cruzi to two distinct hosts, insect and vertebrate, are poorly understood, in part due to the limited ability to perform gene disruption studies by homologous recombination. This report describes a developmentally-defective phenotype that resulted from integ...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/s0074-02762007000100019
更新日期:2007-02-01 00:00:00
abstract::BACKGROUND Studies on malaria vectors in the Pantanal biome, Central Brazil, were conducted more than half a century ago. OBJECTIVES To update anopheline records and assess receptivity and vulnerability to malaria transmission. METHODS Five-day anopheline collections were conducted bimonthly in Salobra, Mato Grosso do...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/0074-02760170175
更新日期:2018-02-01 00:00:00
abstract::The ultrastructure of endogenous stages of Eimeria ninakohlyakimovae was observed in epithelial cells of cecum and colon crypts from a goat experimentally infected with 2.0 x 10(5) oocysts/kg. The secondary meronts developed above the nucleus of the host cell. The nucleus first divides and merozoites then form on the ...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/s0074-02761997000400017
更新日期:1997-07-01 00:00:00
abstract::Dipteran polytene chromosomes provide an excellent model for understanding in species complexes, as well as for structural and functional cytogenetics. The status of species in the Culex pipiens complex is controversial and the use of polytene chromosomes for cytogenetic analysis in the subfamily Culicinae has been di...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/s0074-02762003000300016
更新日期:2003-04-01 00:00:00
abstract::Nontuberculous mycobacteria are ubiquitous and saprophytic organisms that have been implicated in a wide spectrum of diseases due to an increasing number of immunocompromised patients. The natural resistance of atypical mycobacteria to classical antituberculous drugs has encouraged research into new chemotherapeutic a...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/s0074-02762009000400008
更新日期:2009-07-01 00:00:00
abstract::Five field populations of Musca domestica L. collected in poultry farms were bioassayed in order to detect possible resistance to the larvicide cyromazine in Brazil. The concentrations used were 0, 0.5, 0.1, 0.2, 0.4, 1, 2, 4 and 8 ppm. Three populations (Petrópolis, RJ, Montes Claros, MG and Promissão, SP) were resis...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/s0074-02762001000500027
更新日期:2001-07-01 00:00:00
abstract::For the first time Angiostrongylus vasorum in Canis familiaris in Minas Gerais State, Brazil, is described. The description and measurements of three males and ten females are presented together with a diagram of the parasite. ...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/s0074-02761985000200015
更新日期:1985-04-01 00:00:00
abstract::Experimental techniques that we have found useful during our studies of insect blood-feeding behaviour are reviewed. Some of the principal findings resulting from these techniques are discussed. Where directly applicable, the work of others is included, but no complete review of the subject has been attempted. ...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章,评审
doi:10.1590/s0074-02761987000700005
更新日期:1987-01-01 00:00:00
abstract::The biochemical pathways involved in nicotinamide adenine dinucleotide (NAD) biosynthesis converge at the enzymatic step catalysed by nicotinamide mononucleotide adenylyltransferase (NMNAT, EC: 2.7.7.1). The majority of NMNATs are assembled into homo-oligomeric states that comprise 2-6 subunits. Recently, the NMNAT of...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/0074-02760180073
更新日期:2018-07-10 00:00:00
abstract::Chagas cardiomyopathy is the most frequent and most severe manifestation of chronic Chagas disease, and is one of the leading causes of morbidity and death in Latin America. Although the pathogenesis of Chagas cardiomyopathy is incompletely understood, it may involve several mechanisms, including parasite-dependent my...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/0074-02760160334
更新日期:2017-03-01 00:00:00
abstract::Peritoneal exudate cells from mice infected with Schistosoma mansoni (S-PEC) can kill schistosomula in vitro in the presence of immune serum. S-PEC produce a low level of respiratory burst, and schistosomula mortality in their presence is not reduced when exogenous antioxidants are added, suggesting that with S-PEC, o...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/s0074-02761987000800052
更新日期:1987-01-01 00:00:00
abstract::American cutaneous leishmaniasis (ACL) has been increasing in Pernambuco, thus becoming an important problem for Public Health. The incindence is predominant in the region called 'Zona da Mata', in the east of this state. This region corresponds geographically to the primitive area of the Atlantic forest. In order to ...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/s0074-02761994000300028
更新日期:1994-07-01 00:00:00
abstract::Ketoconazole, an azole antifungic drug which is already in the market has also been demonstrated to be active against Trypanosoma cruzi experimental infections. In this paper we confirmed the drug effect and investigated its range of activity against different T. cruzi strains naturally resistant or susceptible to bot...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 临床试验,杂志文章
doi:10.1590/s0074-02761993000100023
更新日期:1993-01-01 00:00:00
abstract::We report the finding of Tetrameres spirospiculum Pinto & Vicente, 1995 from Theristicus melanopis melanopis (Threskiornithidae) from Patagonia, Argentina. These constitute new host and locality records. We propose the assignation of this species to the subgenus T. (Gynaecophila) Gubanov, 1950, based on the presence o...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/s0074-02762001000300009
更新日期:2001-04-01 00:00:00
abstract::Epstein-Barr virus (EBV) plays a major role in liver pathology. Similar to other members of the herpesvirus family, EBV establishes a persistent infection in more than 90% of adults. The aim of this study was to evaluate the impact of EBV and chronic hepatitis C co-infection (HCV) on biochemical and immunological resp...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/0074-0276140049
更新日期:2014-09-01 00:00:00
abstract::Predictions that deforestation would reduce American cutaneous leishmaniasis incidence have proved incorrect. Presentations at a recent international workshop, instead, demonstrated frequent domestication of transmission throughout Latin America. While posing new threats, this process also increases the effectiveness ...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/s0074-02762001000200004
更新日期:2001-02-01 00:00:00
abstract::Non-bilayer phospholipid arrangements are three-dimensional structures that form when anionic phospholipids with an intermediate structure of the tubular hexagonal phase II are present in a bilayer of lipids. Antibodies that recognise these arrangements have been described in patients with antiphospholipid syndrome an...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/s0074-02762012000900016
更新日期:2012-12-01 00:00:00
abstract::In 2004, the urban presence of Lutzomyia longipalpis was recorded for the first time in Formosa province. In 2006, the first autochthonous case of human urban visceral leishmaniasis (VL) was recorded in Misiones in the presence of the vector, along with some canine VL cases. After this first case, the vector began to ...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/0074-0276130358
更新日期:2013-12-01 00:00:00
abstract::As in many areas of Brazil, the AIDS epidemic in Curitiba is relatively stable, but surveillance is important to support public policy. The molecular characteristics of HIV may be instrumental for monitoring epidemic trends. We evaluated plasma HIV-1 RNA (n = 37) from 38 cases presenting with positive serology, who we...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/s0074-02762008000800010
更新日期:2008-12-01 00:00:00
abstract::Forty-three (31.4%) out of 137 serum samples obtained from two Indian communities living in the Amazon region were found to be positive for HTLV-I antibody, as tested by enzyme-linked immunosorbent assay (ELISA). Eighty-two sera were collected from Mekranoiti Indians, yielding 39% of positivity, whereas 11 (20.0%) of ...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/s0074-02761990000100004
更新日期:1990-01-01 00:00:00
abstract::Domiciliated Rhodnius prolixus and sylvatic R. colombiensis were analyzed in order to confirm their genetic divergence and verify the risk that the latter represents in the domiciliation process, and to provide tools for identifying the sources of possible reinfestation by triatomines in human dwellings allowing contr...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/s0074-02762001000800003
更新日期:2001-11-01 00:00:00
abstract::An increased plasma concentration of von Willebrand factor (vWF) is detected in individuals with many infectious diseases and is accepted as a marker of endothelium activation and prothrombotic condition. To determine whether ExoU, a Pseudomonas aeruginosa cytotoxin with proinflammatory activity, enhances the release ...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/s0074-02762012000600004
更新日期:2012-09-01 00:00:00
abstract::Living in close association with a vertebrate host and feeding on its blood requires different types of adaptations, including behavioural adjustments. Triatomines exhibit particular traits associated with the exploitation of their habitat and food sources and these traits have been the subject of intense analysis. Ma...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/s0074-02762009000900011
更新日期:2009-07-01 00:00:00
abstract::An overview is presented of the results obtained with biodegradable sustained release devices (SRDs) containing a mixture of polymers and either isometamidium (ISMM) or ethidium. Under controlled laboratory conditions (monthly challenge with tsetse flies infected with Trypanosoma congolense) the protection period in S...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 临床试验,杂志文章,评审
doi:10.1590/s0074-02761999000200016
更新日期:1999-03-01 00:00:00
abstract::A semiarid area of northwest Costa Rica where Lutzomyia longipalpis is common in corrals around houses is described. Monthly captures of the sandfly during two consecutive years for fixed periods of time indicated that the insect bites avidly cows, horses, pigs, dogs and humans. From a total of 14,215 specimens, 90.5%...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/s0074-02761984000400010
更新日期:1984-10-01 00:00:00
abstract:BACKGROUND:The time of progression towards AIDS can vary greatly among seropositive patients, and may be associated with host genetic variation. The NR1I2 (PXR) gene, a ligand-activated transcription factor, regulates the transcription immune pathway genes and can therefore be targets of viral replication mechanisms in...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/0074-02760160382
更新日期:2017-04-01 00:00:00
abstract::A study was undertaken to search for DNA recombinant Schistosoma mansoni proteins responsible for eliciting an antibody response from the host at a very early phase after infection. A S. mansoni adult worm cDNA expression library was screened using pooled sera from baboons with four weeks of infection. Based on their ...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/s0074-02762002000500022
更新日期:2002-07-01 00:00:00
abstract::The anesthetic effect of some water-soluble anesthesic or narcotic drugs currently used in mice was tested in molluscs of the Biomphalaria genus. Sodium thiopental was very toxic to the snails resulting in high rates of mortality in all the treatment schedules tested. Cetamine base, at concentration of 0.25 mg/ml of w...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/s0074-02762001000300019
更新日期:2001-04-01 00:00:00
abstract::In this study we compared two polymerase chain reaction (PCR) methods using either 16S ribosomal RNA (rRNA) or 23S rRNA gene primers for the detection of different Leptospira interrogans serovars. The performance of these two methods was assessed using DNA extracted from bovine tissues previously inoculated with sever...
journal_title:Memorias do Instituto Oswaldo Cruz
pub_type: 杂志文章
doi:10.1590/s0074-02762012000100012
更新日期:2012-02-01 00:00:00