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Identification and partial characterization of a Carica papaya-infecting isolate of Alfalfa mosaic virus in Brazil

MOREIRA, A. G.; KITAJIMA, E. W.; REZENDE, J. A. M.
Fonte: SPRINGER TOKYO Publicador: SPRINGER TOKYO
Tipo: Artigo de Revista Científica
Português
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A Carica papaya plant with severe yellow leaf mosaic, leaf distortion, and systemic necrosis was found in the municipality of Piracicaba, state of So Paulo, Brazil. Transmission electron microscopy (TEM) analysis revealed the presence of potyvirus-like particles and bacilliform particles similar to those of the Alfamovirus genus. The potyvirus was identified as Papaya ringspot virus-type P (PRSV-P). Biological, serological, and molecular studies confirmed the bacilliform virus as an isolate of Alfalfa mosaic virus (AMV). Partial nucleotide and amino acid sequences of the coat protein gene of this AMV isolate shared 97-98% identity with the AMV isolates in the GenBank database. This report is the first of the natural infection of papaya plants by AMV.

Pectinesterase do mamão (Carica papaya L.); Pectinesterase from papaya (Carica papaya L.)

Catutani, Adelaide Tie
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 23/12/1982 Português
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Não consta resumo na publicação.; Pectinesterase (E C 3.1.1.11) was extracted from papaya (Carica papaya L.) tissue and purified 4,48 fold by fractionated ammonium sulphate precipitation, dialysis and chromatography on DEAE-celulose and Sephadex G-100. Extraction conditions of enzyme were studied and their properties characterized. The increase on the activity of pectinesterase was practically followed by increase on the content of soluble pectin, during ripening. The molecular weight of the enzyme eluted in one peak of activity was 53.000 daltons. The pectinesterase has its maximum activity at pH 8,0 and at 0,2 M of NaCl. Optimum temperature for the enzyme assay was 60°C. The enzymatic reaction was linear with the time and protein concentration. With citric pectin as substrate, pectinesterase had a Km of 0,012% and was inhibited competitively by polygalacturonic acid with a Ki of 0,007%. Papaya pectinesterase was inhibited by sucrose, glucose and glicerol.

Identification of sex in Carica papaya L. using RAPD markers

Lemos, EGM; Silva, CLSP; Zaidan, H. A.
Fonte: Kluwer Academic Publ Publicador: Kluwer Academic Publ
Tipo: Artigo de Revista Científica Formato: 179-184
Português
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Brazil is currently the worlds largest producer of papaya (Carica papaya L.), producing fruits for both the domestic market and export. Only fruits from hermaphrodite plants are marketed because they have the necessary commercial characteristics, i.e. they are pear-shaped and have thicker flesh and a smaller internal cavity. Increased papaya yield has been limited mainly by the ratio of female to hermaphrodite (1:2) plants normally occurring in orchards. This ratio causes great losses to papaya producers and the identification of the sex of seedlings during the nursery stage would be an important advance. In our study random amplified polymorphic DNA (RAPD) analysis was used to differentiate between the sexual forms of three commercial C. papaya cultivars belonging to the Solo group. RAPD assays using the BC210 primer were able to detect hermaphrodites in all of the cultivars tested. The BC210(438)molecular marker was much better at papaya sex differentiation than other markers described in the literature.

Microbicidal effect of medicinal plant extracts (Psidium guajava Linn. and Carica papaya Linn.) upon bacteria isolated from fish muscle and known to induce diarrhea in children

VIEIRA,Regine Helena Silva dos Fernandes; RODRIGUES,Dália dos Prazeres; GONÇALVES,Flávia Araújo; MENEZES,Francisca Gleire Rodrigues de; ARAGÃO,Janisi Sales; SOUSA,Oscarina Viana
Fonte: Instituto de Medicina Tropical Publicador: Instituto de Medicina Tropical
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2001 Português
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Out of the twenty-four samples of shrimp and fish muscle used for this study, twelve were collected near a large marine sewer for waste disposal, 3 km off the coast of Fortaleza (Brazil) and used for the isolation of E. coli. Other twelve were collected at the Mucuripe fresh fish market (Fortaleza, Brazil) and used for the isolation of Staphylococcus aureus. Ethanol, water and acetone-diluted extracts of guava and papaya leaf sprouts were tested on the bacteria in order to verify their microbicidal potential. The E. coli strains used in the trials were rated LT positive. The papaya leaf extracts (Carica papaya Linn) showed no microbicidal activity while the guava sprout extracts (Psidium guajava Linn) displayed halos exceeding 13 mm for both species, an effect considered to be inhibitory by the method employed. Guava sprout extracts by 50% diluted ethanol most effectively inhibited E. coli (EPEC), while those in 50% acetone were less effective. It may be concluded that guava sprout extracts constitute a feasible treatment option for diarrhea caused by E. coli or by S. aureus-produced toxins, due to their quick curative action, easy availability in tropical countries and low cost to the consumer.

Changes in protein profile during coagulation of latex from Carica papaya

Fonte: Associação Brasileira de Divulgação Científica Publicador: Associação Brasileira de Divulgação Científica
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/05/1997 Português
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We describe the changes in peptide composition by SDS-PAGE analysis of latex from Carica papaya collected at various times after incision of the unripe fruit. The data show that during latex coagulation several peptides are processed in an orderly fashion.

Phytochemical screening and hypoglycemic activity of Carica papaya leaf in streptozotocin-induced diabetic rats

Juárez-Rojop,Isela E.; A.Tovilla-Zárate,Carlos; Aguilar-Domínguez,Dora E.; Fuente,Luis F. Roa-de la; Lobato-García,Carlos E.; Blé-Castillo,Jorge L.; López-Meraz,Leonor; Díaz-Zagoya,Juan C.; Bermúdez-Ocaña,Deysi Y.
Fonte: Sociedade Brasileira de Farmacognosia Publicador: Sociedade Brasileira de Farmacognosia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2014 Português
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69.398%
The extraction of plant constituents is essential to isolate biologically active compounds, aimed to understand their role on the treatment of diabetes. This study was designed to explore the preliminary phytochemical and physicochemical analysis of Carica papaya L., Caricaceae, leaf, and further evaluation of its hypoglycemic effect on diabetic rats. C. papaya leaves were extracted using chloroform, n-hexane or ethanol. For each extract a phytochemical screening was performed. The tests were conducted in triplicate and the qualitative and quantitative determination of the various metabolites was done using analytical standards proposed by Mexican Herbal Pharmacopoeia. The chloroform extract, containing steroids and quinones as major components, was chosen to study C. papaya biological effects. The chloroform extract was evaporated to dryness, and doses 0, 31, 62, 125 mg/kg were orally administered in 300 µl polyethylene glycol to diabetic rats; and 0 and 62 mg/kg to non-diabetic rats. After a 20-day treatment with the chloroform extract, the animals were sacrificed and blood was obtained for biochemical studies. The main effect observed was a decrease in serum glucose, triglycerides and transaminases in diabetic rats after the administration of C. papaya chloroform extract. These results confirm the potential beneficial action of C. papaya to treat the symptoms of diabetic patients.

Variabilidade e controle de Phytophthora palmivora (podridão-do-pé) e controle da varíola (Asperisporium caricae) do mamoeiro (Carica papaya).

DIANESE, A. de C.
Fonte: 2006 Publicador: 2006
Tipo: Teses/dissertações (ALICE) Formato: 109 f.
Português
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O mamoeiro (Carica papaya L.), possivelmente originário da América Central, é uma das plantas tropicais de maior importância na produção nacional e mundial de fruteiras. Este projeto visou estudar diferentes aspectos de duas doenças importantes que afetam a produção de mamão no Brasil: a podridão do pé e dos frutos (Phytophthora palmivora) e a varíola (Asperisporium caricae). Uma coleção de isolados de P. palmivora foi montada para se verificar a variabilidade em termos de virulência do patógeno em experimentos com mudas e frutos de mamoeiro. A maioria dos isolados do patógeno provenientes do mamoeiro foi altamente virulenta. O isolado proveniente de Morremia odorata foi avirulento. Além disso, diferentes genótipos de mamão foram avaliados no campo e em experimentos em casa de vegetação para resistência a P. palmivora. O cultivar ?Tailândia Roxão? demonstrou ser moderadamente resistente. Conjuntamente, fertilizantes a base de fosfitos foram testados para o controle da doença, com dois produtos (fosfito 40 % P2O5 + 20 % K2O, 150 ml/100 l; e fosfito 20 % P2O5 + 20 % K2O, 200 ml/100 l) retardando o desenvolvimento da doença. Do mesmo modo dez isolados de Trichoderma sp. foram avaliados quanto ao seu potencial como agentes de controle biológico de P. palmivora em experimentos com mudas em casa de vegetação. Os isolados cen162 e cen235 foram os mais efetivos. Diferentes doses de nitrogênio e calcário dolomítico incorporadas ao solo em experimentos com vasos também foram avaliadas em relação a sua influência no desenvolvimento da podridão do pé em mudas de mamoeiro. O tratamento com 1...

Portable chlorophyll meter for the quantification of photosynthetic pigments, nitrogen and the possible use for assessment of the photochemical process in Carica papaya L.; Medidor portátil de clorofila : determinação dos teores de pigmentos fotossintéticos, nitrogênio e possibilidades de uso nas interpretações do processo fotoquímico em Carica papaya L.

Torres Netto, Alena; Campostrini, Eliemar; Oliveira, Jurandi Gonçalves de; Yamanishi, Osvaldo Kiyoshi
Fonte: Universidade de Brasília Publicador: Universidade de Brasília
Tipo: Artigo de Revista Científica
Português
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ABSTRACT; The techniques utilized to extract chlorophyll from plant materials are destructive and based on methods that use organic solvents. This study proposes the non-destructive quantification of chlorophyll and nitrogen concentration using a portable chlorophyll meter (SPAD-502). Further, was possible to establish relationships between chlorophyll fluorescence and SPAD-502 values. This methodology could save time, space and resources, and could be used for analysis of the photosynthetic processes. Papaya leaves (Solo and Formosa groups) of different ages were collected from 15-month-old plants cultivated in a commercial field in São Francisco de Itabapoana, Rio de Janeiro State (410:15W; 210:27S). Correlations were established between the chlorophyll content and carotenoids extracted in DMSO, nitrogen content, a chlorophyll a fluorescence (Ff, Fmax, Fn/Fmax, qN, qP, NPQ) with readings from SPAD-502 taken on papaya leaves of different ages. The results show that while the qp and the Fn/Fmax increased with SPAD-502 readings of up to 40, the qN and NPQ variables decreased. The Fmax presented a direct linear correlation with the SPAD-502 values while the Ff variable did not correlate with the SPAD-502 values. The portable chlorophyll meter was shown to be useful for nondestructive determination of photosynthetic pigments (chlorophyll and carotenoids) and can be used indirectly in advanced interpretation of the photochemical process in Carica papaya L. leaves. ________________________________________________________________________________ RESUMO; Os métodos utilizados para a extração de clorofila em materiais vegetais são destrutivas e baseiam-se em métodos que utilizam solventes orgânicos. Este trabalho propõe a quantificação não-destrutiva dos teores de clorofila e nitrogênio por meio do SPAD-502. Ainda...

Leaf gas exchange characteristics of four papaya genotypes during different stages of development; Trocas gasosas em folhas de diferentes estádios de desenvolvimento em genótipos de mamoeiro (Carica Papaya L.)

Campostrini, Eliemar; Yamanishi, Osvaldo Kiyoshi; Martinez y Huaman, Carlos Alberto
Fonte: Universidade de Brasília Publicador: Universidade de Brasília
Tipo: Artigo de Revista Científica
Português
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ABSTRACT; In this research, was used four papaya (Carica papaya L.) genotypes: three from the 'Solo ( Sunrise Solo TJ, Sunrise Solo 72/12 and Baixinho de Santa Amália) group and one from the 'Formosa' group (Know-You 01). They were grown in plastic pots containing a sandy-clay-loam soil subjected to pH correction and fertilization, under greenhouse conditions. Throughout the experimental period plants were subjected to periodic irrigation to maintain the soil humitidy around field capacity. The experiment was conducted 73 days after sowing. In all genotypes, leaf gas exchange characteristics were determined. The net photosynthetic rate (A, mmol m-2 s-1 ), stomatal conductance (gs mol m-2 s-1), leaf temperature (TI, 0C) and intercellular carbon dioxide concentration (ci, mL L-1) on the 4th, 5th, 6th, 7th, 8th and 9th leaves from the plant apex were determined. No significant differences were observed for A, gs, ci, or Tl either among the leaves sampled from any of the genotypes. A was positively correlated with gs and in the other hand TI and gs were negatively correlated. The results suggest that, for 73 DAP, all the sampled papaya leaves functioned as sources of organs. ___________________________________________________________________________________ RESUMO; Neste trabalho...

Estudo Comparativo entre os Constituintes Voláteis Liberados por Machos Ceratitis Capitata e Anastrepha obliqua (Diptera: Tephritidae) e seus Frutos Hospedeiros Preferencial Averrhoa carambola L. e Secundário, Carica papaya L.

Silva, Carlos Eduardo da
Fonte: Universidade Federal de Alagoas; BR; Química; Biotecnologia; Programa de Pós-Graduação em Química e Biotecnologia; UFAL Publicador: Universidade Federal de Alagoas; BR; Química; Biotecnologia; Programa de Pós-Graduação em Química e Biotecnologia; UFAL
Tipo: Dissertação Formato: application/pdf
Português
Relevância na Pesquisa
69.602876%
Males of fruit flies (Diptera: Tephritidae) release a complex blend of chemical constituents to attract co-especific males and females (aggregation pheromone). Males fruit fly from the genus Bactrocera use chemicals acquired from their host by feeding as part of their aggregation pheromone. Considering this information, studies were carried out aiming to find out if the chemical constituentes relesead by preferencial, Averrhoa carambola L. (Oxalidaceae) and alternative, Carica papaya L. (Caricaceae) fruit hosts, whose fruit fly larvae fed on these fruits, exert any influence in the chemical composition of the odours released by calling males of Ceratitis capitata and Anastrepha obliqua. In addition, a correlation between the time when the majority of C. capitata males displayed the calling behaviour and the amount of chemical constituents released by them was also studied. The volatile constituents released by calling males of the two fruit fly species and their mature host fruits were extracted by means of headspace technique using Tenax® and activated charcoal as adsorvents and desorptions were carried out by use of HPLC grade n-hexane. The results demonstrated that the chemicals found exclusively in papaya fruits were also present in extracts of C. capitata and A. obliqua calling males...

Drying kinetics of fresh and osmotically pre-treated papaya (Carica papaya L.).

EL-AOUAR, A. A.; AZOUBEL, P. M.; MURR, F. E. X.
Fonte: Journal of Food Engineering, Barking, v. 59, p. 85-91, 2003. Publicador: Journal of Food Engineering, Barking, v. 59, p. 85-91, 2003.
Tipo: Artigo em periódico indexado (ALICE)
Português
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The aim of this work was to study and to model the drying kinetics of fresh osmotically pre-treated papaya cubes \(Carica papaya L.) using the diffusional model (Fick's seccond law) adapted to a cubic geometry, and an empirical two parameters model. The osmotic pre-treatment was carried out in an incubator at constant tenperature and agitation. The drying process was carried out in a fixed bed dryert two different temperatures and air velocities. At the beginning of the drying process of fresh papaya, drying rate was influenced by both air velocity and air temperature. But lose to the equilibrium condition, the drying rate was affected a only by the air temperature. The physico-chemical changes in the papaya cubes during osmotic pre-tratment caused differences in the drying rate in the subsequent air drying prcess when compared to fresh papaya cubes. The effective diffusivities of water, calculated by diffusional model, were of the order of 10-9 m2/s.; 2003

Development and validation of minisatellite markers for Carica papaya

OLIVEIRA, G. A. F.; DANTAS, J. L. L.; OLIVEIRA, E. J. de
Fonte: Biologia Plantarum, v. 59, n.4, p 686-694, 2015. Publicador: Biologia Plantarum, v. 59, n.4, p 686-694, 2015.
Tipo: Artigo em periódico indexado (ALICE)
Português
Relevância na Pesquisa
69.398%
Whereas microsatellite markers are well described, there are few studies investigating minisatellites. Therefore, this study aimed to identify, characterize, and validate minisatellite loci for papaya (Carica papaya L.). The entire papaya genome, which covers 330 Mb, was used to mine minisatellites with motifs ranging from 6 to 500 bp, and at least six replicates and 82 loci were validated in a set of 24 accessions. A total of 1 730 minisatellite loci were identified, located in 695 sequences, with an average of one minisatellite every 156 kb. Variation in GC content ranged from 0.00 to 83.84 % with an average of 28.84 % indicating that these papaya minisatellites are AT rich. Motifs of up to 20 bases represented 71.45 % of the markers. In addition, the observed variation in the number of motif repeats was from 6 to 186 with an average of 9.27 per minisatellite. Independent of the classification, the frequency of minisatellites decreased with an increase in the number of repeating units. Among the validated loci, 48.78 % were found to be polymorphic, and the number of alleles (NA) ranged from two to seven with a mean of 3.10. The average polymorphic information content (PIC), expected heterozygosity (He), and observed heterozygosity (Ho) were 0.38...

Caracterização morfoagronômica de genótipos de mamoeiro (Carica papaya L.) e seleção de descritores visando a proteção de cultivares.

Dias, Nágela Lazare Pereira
Fonte: Universidade Federal do Recôncavo da Bahia Publicador: Universidade Federal do Recôncavo da Bahia
Português
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69.59802%
O mamoeiro (Carica papaya L.) é uma das fruteiras mais cultivadas no mundo, todavia, há necessidade de novas variedades para a expansão e sustentabilidade da cultura. Assim sendo, é de suma importância determinar a variabilidade genética presente nos acessos de mamão, permitindo aos melhoristas o direcionamento dos cruzamentos mais apropriados para o desenvolvimento de cultivares. A caracterização destes acessos representa, pois, uma etapa primordial no processo de síntese de novos genótipos. Os objetivos deste trabalho foram avaliar, em 27 genótipos de mamoeiro, a variação de 30 descritores quantitativos e estimar parâmetros genéticos, bem como definir uma lista de descritores mínimos visando a proteção de cultivares, a partir de 30 descritores quantitativos e 21 multicategóricos, relacionados à planta, folhas, flores, frutos e sementes. Os genótipos apresentaram amplo polimorfismo para os descritores quantitativos, sendo que para todos os descritores a maior parte da variabilidade foi devida à variância genotípica, com estimativas de herdabilidade variando de 60,48 a 99,05%. Para a indicação dos descritores mais informativos, os dados quantitativos foram selecionados com base nos métodos de Singh e seleção direta...

Isolation of a novel Carica papaya _-amylase inhibitor with deleterious activity toward Callosobruchus maculatus

Farias, Luciana Ramalho; Costa, Fábio Teles; Souza, L.A.; Pelegrini, Patrícia Barbosa; Grossi-de-Sá, Maria Fátima; Maria Neto, Simone; Bloch Júnior, Carlos; Laumann, Raul Alberto; Noronha, Eliana Ferreira; Franco, Octávio Luiz
Fonte: Universidade Católica de Brasília Publicador: Universidade Católica de Brasília
Tipo: Artigo de Revista Científica Formato: Texto
Português
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Cowpea (Vigna unguiculata) is a subsistence crop for small and poor farmers from Latin America and Africa. This culture is commonly damaged by cowpea weevil (Callosobruchus maculatus), which burrow into stored seeds to fed on. Due to impact of larval predation, several plant defense studies have been developed, indicating that _-amylase inhibitors are able to impede and/or reduce bruchids digestive process. In this report, a novel _-amylase inhibitor from papaya seeds (Carica papaya) with activity against cowpea weevil enzymes was puriWed and biochemical characterized. Peeled seeds were macerated and extracted with a 0.6M NaCl and 0.1% HCl solution. Crude extract was precipitated with ammonium sulphate (100%). After dialyses, this rich fraction was applied onto a CM-Cellulose column and retained peak was submitted to an analytic reversed-phase column HPLC (Vydac C-18TP) yielding several peaks. Only one fraction, with molecular mass of 4562Da, showed signiWcant inhibitory activity against C. maculatus _-amylases. Otherwise, no inhibitory activities against mammalian _-amylases were observed. Bioassays using artiWcial seeds containing C. papaya _-amylase inhibitor rich fraction (0.5% and 1.0%) were also conduced showing that _-amylase inhibitors were able to increase larval mortality (50%) and also decrease insect fecundity and adult longevity. These results showed the presence of an _-amylase inhibitor from C. papaya seeds with high speciWcity to insect enzymes...

Adubação nitrogenada em cobertura e substratos na produção de mudas de mamoeiro 'Formosa'; Nitrogen fertilization as top dressing and different substrates on the production of 'Formosa' papaya (Carica papaya L.) seedlings

Mendonça, Vander; Ramos, José Darlan; Abreu, Nildo Antônio Arruda de; Teixeira, Glauco Antônio; Souza, Henrique Antunes de; Gurgel, Rafael Lucas da Silva; Orbes, Maria Yumbla
Fonte: Editora da Universidade Federal de Lavras Publicador: Editora da Universidade Federal de Lavras
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 30/04/2015 Português
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Aiming at evaluating the seedling production of papaya (Carica papaya L.) on different substrates and nitrogen fertilization as top dressing, an experiment was carried out at the plant formation area of Federal University of Lavras orchard. Five doses of nitrogen were tested, viz.: 0; 400; 800; 1600, and 3200 mg N dm-3 substrate, applied five times, and in each application, 20 mL of the solution containing the N was added to the polyethylene bags (500 mL capacity). Two substrate composition were tested, namely A (organic compost + sand + soil at 1:1:3 volume proportion) and B (Plantmax + sand + soil at 1:1:3 volume proportion). A randomized block design was used with factorial scheme 5x2, with four replications and five plants per plot. One hundred and eighty days after the sowing the following characteristics were evaluated: height of the aerial parts (cm), length of roots (cm), number of leaves/plant, dry matter of aerial part, root, and total plant (g/plant). It was observed that the doses up to 1.800 mg N dm-3 as top dressing promoted better quality in the formation of seedlings. The substrate B promoted the best results in the production of 'Formosa' papaya plants.; Objetivando-se avaliar a produção de mudas de mamoeiro em diferentes substratos com adubações de nitrogênio em cobertura...

Estudo Comparativo entre os Constituintes Voláteis Liberados por Machos Ceratitis Capitata e Anastrepha obliqua (Diptera: Tephritidae) e seus Frutos Hospedeiros Preferencial Averrhoa carambola L. e Secundário, Carica papaya L.

Silva, Carlos Eduardo da
Fonte: Universidade Federal de Alagoas; BR; Química; Biotecnologia; Programa de Pós-Graduação em Química e Biotecnologia; UFAL Publicador: Universidade Federal de Alagoas; BR; Química; Biotecnologia; Programa de Pós-Graduação em Química e Biotecnologia; UFAL
Tipo: Dissertação Formato: application/pdf
Português
Relevância na Pesquisa
69.602876%
Males of fruit flies (Diptera: Tephritidae) release a complex blend of chemical constituents to attract co-especific males and females (aggregation pheromone). Males fruit fly from the genus Bactrocera use chemicals acquired from their host by feeding as part of their aggregation pheromone. Considering this information, studies were carried out aiming to find out if the chemical constituentes relesead by preferencial, Averrhoa carambola L. (Oxalidaceae) and alternative, Carica papaya L. (Caricaceae) fruit hosts, whose fruit fly larvae fed on these fruits, exert any influence in the chemical composition of the odours released by calling males of Ceratitis capitata and Anastrepha obliqua. In addition, a correlation between the time when the majority of C. capitata males displayed the calling behaviour and the amount of chemical constituents released by them was also studied. The volatile constituents released by calling males of the two fruit fly species and their mature host fruits were extracted by means of headspace technique using Tenax® and activated charcoal as adsorvents and desorptions were carried out by use of HPLC grade n-hexane. The results demonstrated that the chemicals found exclusively in papaya fruits were also present in extracts of C. capitata and A. obliqua calling males...

Uso de extrato de plantas medicinais (Psidium guajava Linn. e Carica papaya Linn.) frente a bactérias isoladas de pescado, causadoras de diarréias infantis; Microbicidal effect of medicinal plant extracts (Psidium guajava Linn. and Carica papaya Linn.) upon bacteria isolated from fish muscle and known to induce diarrhea in children

VIEIRA, Regine Helena Silva dos Fernandes; RODRIGUES, Dália dos Prazeres; GONÇALVES, Flávia Araújo; MENEZES, Francisca Gleire Rodrigues de; ARAGÃO, Janisi Sales; SOUSA, Oscarina Viana
Fonte: Universidade de São Paulo. Instituto de Medicina Tropical de São Paulo Publicador: Universidade de São Paulo. Instituto de Medicina Tropical de São Paulo
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; ; Formato: application/pdf
Publicado em 01/06/2001 Português
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Foram coletadas doze amostras de camarão e peixes nas imediações do interceptor oceânico, em Fortaleza e igual número na Feira de pescado do Mucuripe, Fortaleza, para isolamento de E. coli e Staphylococcus aureus, respectivamente. Extratos aquosos, alcoólicos e cetônicos de broto de goiabeira e de folha de mamão foram testados frente às bactérias para se verificar suas ações antibióticas. As cepas de E. coli utilizadas nos ensaios foram as classificadas como LT positivas. Os extratos de folhas de mamão (Carica papaya Linn) não revelaram quaisquer atividades antibióticas enquanto que os preparados com broto de goiabeira (Psidium guajava Linn) apresentaram halos sempre >;13 mm para as duas espécies, considerados como de inibição pelo método empregado. Os extratos de broto de goiabeira que apresentaram melhores resultados frente às cepas de E. coli ETEC foram os alcoólicos a 50% seguido do cetônico também a 50%. Concluímos que nos tratamentos de diarréias causadas por E. coli ou por toxinas elaboradas por S. aureus o extrato de brotos de goiabeira é uma opção devido a sua pronta ação curativa, seu fácil cultivo nos países tropicais e ao seu baixo valor aquisitivo.; Out of the twenty-four samples of shrimp and fish muscle used for this study...

Parámetros poblacionales de Tetranychus merganser Boudreaux (Acari: Tetranychidae) en papayo (Carica papaya L.) a diferentes temperaturas

Reyes-Pérez,Noel; Villanueva-Jiménez,Juan A.; de la Cruz Vargas-Mendoza,Mónica; Cabrera-Mireles,Héctor; Otero-Colina,Gabriel
Fonte: Colegio de Postgraduados Publicador: Colegio de Postgraduados
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2013 Português
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El ácaro Tetranychus merganser es una de las especies que causa mayor daño económico en la zona productora de papayo (Carica papaya) del estado de Veracruz, México. Por tanto, se requiere conocer aspectos de su biología para tomar mejores decisiones de su manejo. Se obtuvo una colonia de ácaros a partir de una hembra recolectada en el municipio de Manlio F. Altamirano, y se incrementó la población en invernadero sobre hojas de frijol (Phaseolus vulgaris). El objetivo fue evaluar la influencia de la temperatura en los parámetros poblacionales de esta especie y sobre la duración de sus fases de desarrollo. Para ello se iniciaron cohortes desde huevecillos y expuestas a las siguientes condiciones: temperaturas constantes (19, 23, 27, 31, 33 y 35 °C); 60±2 % de humedad relativa; fotoperiodo de 14:10 h luz:oscuridad y alimentación en discos de hojas de papaya. La duración del ciclo de vida de T. merganser disminuyó de 52.3 hasta 12.9 d con el aumento de la temperatura. La tasa neta reproductiva (Ro) fue 37.40, 62.38, 43.98, 10.47 y 2.32 para 19, 23, 27, 31 y 33° C; a 35 °C la cohorte no fue viable. La tasa intrínseca de crecimiento poblacional (r m) fue 0.08, 0.19, 0.21, 0.18 y 0.12 a las temperaturas anotadas. El desarrollo óptimo ocurrió entre 23 y 27 °C. Aunque el papayo no es su mejor hospedero comparado con parámetros poblacionales más favorables obtenidos por otros autores en frijol...

Situación actual y perspectivas tecnológicas para la papaya (Carica papaya L.) en el distrito de Veracruz, Veracruz

Granados Ramírez,Rebeca; Salceda Lopez,Rafael; Longar Blanco,María del Pilar
Fonte: Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias Publicador: Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2015 Português
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La papaya es la tercera fruta tropical más consumida en el mundo y por su dinamismo comercial es considerada una de las más importantes desde el punto de vista económico. México ocupa el sexto lugar como productor mundial con 712 917 t anuales, de las cuales una quinta parte se destina al mercado exterior. El objetivo de este trabajo fue analizar las innovaciones tecnológicas utilizadas durante el proceso de producción de la Carica papaya L. en el DDR 007 Veracruz, e identificar las etapas vulnerables y sugerir estrategias. La metodología incluyó la evaluación del coeficiente de localización, análisis del proceso de producción con énfasis en la utilización de tecnologías de vanguardia, mediante la obtención de información en campo en las comunidades productoras. Se integró la matriz FODA donde se identificaron las fortalezas y factores críticos, oportunidades y amenazas de la actividad frutícola. Se destacaron las condiciones edafo-climáticas para la producción, elevada rentabilidad y rápido retorno de la inversión (fortalezas). De lo anterior, se puede inferir que asignar mayores superficies de tierra al cultivo de papaya en la zona, con certeza será una opción viable para la adquisición de mayores ingresos económicos para los productores locales; además de un creciente consumo y las grandes posibilidades de exportación (oportunidades). Se subraya la necesidad de adicionar biotecnología para retrasar el proceso de maduración...

Obtención, regeneración y evaluación de híbridos intergenéricos entre Carica papaya Y Vasconcellea cauliflora

Vegas,Ariadne; Trujillo,Gustavo; Sandrea,Yanet
Fonte: ASOCIACIÓN INTERCIENCIA Publicador: ASOCIACIÓN INTERCIENCIA
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2003 Português
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El rescate de híbridos de cruces intergenéricos entre la lechosa (Carica papaya L.) y otras especies de vasconcelleas (antes conocidas como caricas) posibilita la transferencia de genes desde las especies silvestres hacia la cultivada. El objetivo del presente trabajo fue la obtención y evaluación de plantas híbridas mediante el rescate y regeneración de embriones u óvulos después del cruce entre C. papaya y Vasconcellea cauliflora. Se obtuvo un porcentaje de fructificación entre 0 y 76%, de acuerdo al tipo de lechosa usada en el cruce. En los frutos, las semillas fueron vanas, inmaduras o contenían embriones cigóticos. En la mayoría de ellas ocurrió la poliembrionía cigótica in vivo, aún cuando también se produjeron híbridos individuales. Se logró el desarrollo, germinación y multiplicación de embriones híbridos, y la regeneración de plantas in vitro. Las plantas sembradas en campo produjeron flores andróicas y andromonóicas.