oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

4 ( 1 )

2020 ( 7 )

2019 ( 427 )

2018 ( 561 )

Custom range...

Search Results: 1 - 10 of 284778 matches for " Jo?o Rafael de Conte Carvalho de;Leite "
All listed articles are free for downloading (OA Articles)
Page 1 /284778
Display every page Item
Parasitism Capacity of Trichogramma pretiosum and Trichogramma acacioi (Hym.: Trichogrammatidae) on eggs of Sitotroga cerealella (Lep.: Gelechiidae)
Pratissoli, Dirceu;Zanuncio, José Cola;Vianna, Ulysses Rodrigues;Andrade, Josimar Souza;Zinger, Fernando Domingo;Alencar, Joo Rafael de Conte Carvalho de;Leite, Germano Le?o Demolin;
Brazilian Archives of Biology and Technology , 2008, DOI: 10.1590/S1516-89132008000600021
Abstract: the objective of this work was to evaluate the parasitism capacity of trichogramma pretiosum riley and t. acacioi brun, moraes and soares (hymenoptera: trichogrammatidae) in eggs of the alternative host sitotroga cerealella (olivier) (lepidoptera: gelechiidae) aiming to use both species in biological control programs of nipteria panacea tierry-mieg (lepidoptera: geometridae). the parasitism rhythm and total parasitism of these parasitoid species were affected by the temperature with higher values during the first 24 h of their life. parasitism period was longer for t. pretiosum and t. acacioi at the lowest temperature.
PRIVA O DE HOSPEDEIRO E ALIMENTA O SOBRE AS CARACTERíSTICAS REPRODUTIVAS DE TRICHOGRAMMA ATOPOVIRILIA (HYMENOPTERA: TRICHOGRAMMATIDAE) HOST AND FEEDING PRIVATION ON THE TRICHOGRAMMA ATOPOVIRILIA (HYMENOPTERA: TRICHOGRAMMATIDAE) REPRODUCTIVE CHARACTERISTICS
Ulysses Rodrigues Vianna,Dirceu Pratissoli,José Cola Zanuncio,Joo Rafael De Conte Carvalho de Alencar
IDESIA , 2010,
Abstract: Comparou-se o efeito de diferentes períodos de tempo sem hospedeiro nas características reprodutivas de Trichogramma atopovirilia (Hymenoptera: Trichogrammatidae) alimentados ou n o. Ovos de Anagasta kuehniella (Lepidoptera: Pyralidae) e Sitotroga cerealella (Lepidoptera: Gelechiidae) foram utilizados como hospedeiros, sendo expostos a fêmeas desse parasitóide após 0, 6, 12, 24, 36, 48, 60, 72, 84 ou 96 horas. Fêmeas de T. atopovirilia, alimentadas parasitaram ovos dos hospedeiros até 96 horas sem os mesmos. No entanto, o parasitismo ocorreu até o período de 24 horas em A. kuehniella e 48 horas com S. cerealella quando n o alimentados. O parasitismo, a emergência e a raz o sexual de T. atopovirilia foram semelhantes em ovos de A. kuehniella, mas com o aumento do período sem esse hospedeiro, decresce ao longo do tempo, com S. cerealella de forma semelhante foi observado para aquelas n o alimentadas. O alimento foi o principal fator que afetou no parasitismo de T. atopovirilia. The effect of time different periods was compared without host in the Trichogramma atopovirilia (Hym.: Trichogrammatidae) reproducitive characteristics fed or not. Anagasta kuehniella (Lepidoptera: Pyralidae) and Sitotroga cerealella (Lepidoptera: Gelechiidae) eggs they were used as hosts, being exposed to that parasitoid females after 0, 6, 12, 24, 36, 48, 60, 72, 84 or 96 hours. T. atopovirilia females, fed and sponged the hosts eggs up to 96 hours without the same ones. However, the parasitism happened until the period of 24 hours in A. kuehniella and 48 hours with S. cerealella when not fed. The T. atopovirilia parasitism, the emergency and the sexual reason were similar in A. kuehniella eggs, but with the increase of the period without that host, it decreases along the time, with S. cerealella in a similar way it was observed for those not fed. The food was the principal factor that affected in the T. atopovirilia parasitism.
PRIVA??O DE HOSPEDEIRO E ALIMENTA??O SOBRE AS CARACTERíSTICAS REPRODUTIVAS DE TRICHOGRAMMA ATOPOVIRILIA (HYMENOPTERA: TRICHOGRAMMATIDAE)
Rodrigues Vianna,Ulysses; Pratissoli,Dirceu; Cola Zanuncio,José; De Conte Carvalho de Alencar,Joo Rafael; Zinger,Fernando Domingo;
Idesia (Arica) , 2010, DOI: 10.4067/S0718-34292010000200010
Abstract: the effect of time different periods was compared without host in the trichogramma atopovirilia (hym.: trichogrammatidae) reproducitive characteristics fed or not. anagasta kuehniella (lepidoptera: pyralidae) and sitotroga cerealella (lepidoptera: gelechiidae) eggs they were used as hosts, being exposed to that parasitoid females after 0, 6, 12, 24, 36, 48, 60, 72, 84 or 96 hours. t. atopovirilia females, fed and sponged the hosts eggs up to 96 hours without the same ones. however, the parasitism happened until the period of 24 hours in a. kuehniella and 48 hours with s. cerealella when not fed. the t. atopovirilia parasitism, the emergency and the sexual reason were similar in a. kuehniella eggs, but with the increase of the period without that host, it decreases along the time, with s. cerealella in a similar way it was observed for those not fed. the food was the principal factor that affected in the t. atopovirilia parasitism.
Selection of Beauveria bassiana (Bals.) Vuill. isolates for controlling Sitophilus zeamais (Mots.) (Coleoptera: Curculionidae)
Rondelli,Vando Miossi; de Carvalho,José Romário; Pratissoli,Dirceu; Polanczyk,Ricardo Antonio; de Alencar,Joo Rafael De Conte Carvalho; Zinger,Fernando Domingo; Pereira,Sara Maria Andrade;
Idesia (Arica) , 2012, DOI: 10.4067/S0718-34292012000300013
Abstract: sitophilus zeamais (mots.) (coleoptera: curculionidae) is considered a major pest of maize, responsible for reducing grain quality and making the corn inappropriate for industrial use and human consumption. s. zeamais has been controlled exclusively with chemical products. the objective of this research was to select isolates of beauveria bassiana (bals.) vuill. to control s. zeamais. beetles were immersed in conidia suspensions of each isolate for five seconds and placed in a gerbox container with maize grains. in pathogenicity tests, the isolates that caused the highest mortality to the maize weevil were esalq-447 (68.0%), cca-ufes/ bb-36 (57.3%) and cca-ufes/bb-31 (51.3%). esalq-447 was the most virulent, with an lc50 of 1.7 x 107 conidia/ml and shows promise for controlling maize weevils. these isolates of b. bassiana can be used as effective substitutes for conventional chemical control, normally carried out with phosphine. further tests should be performed under field and semi-field conditions to develop an appropriate strategy for the use of this entomopathogen to manage s. zeamais.
Structural Characteristics of Mulato Grass I under Different Cutting Heights  [PDF]
Leonardo Assis Dutra, Fabianno Cavalcante de Carvalho, Eneas Reis Leite, Magno José Duarte Candido, Joo Ambrósio de Araújo Filho
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.55077
Abstract:

This work aimed to evaluate the effects of different individual heights of cut on structural characteristics of Brachiaria hibrida cv. Mulato I in four periods of the year. The study was carried out at the Fazenda Experimental Vale do Acaraú, in Sobral, Ceará, Brazil, from January to December, 2008. The experimental design was a split plot, with the plots representing four pasture conditions through manual cuts of 10 cm, 20 cm, 30 cm and 40 cm heights, which were done every 30 days. Each treatment had three replications. The subplots were represented by four periods of evaluation: January-February-March, April-May-June, July-August-September and October-November-December. Fertilization was performed with 350 kg of N/ha, divided into monthly applications. Irrigation was conducted in alternate days during the dry season. The variables studied were: mean height before cutting (cm); dry matter content (%); total dry matter production (t/ha); percentage of leaves; percentage of stems; percentage of dead material; leaf blade/stem ratios; number of total leaves per tiller; number of live leaves per tiller; average size of leaves; and tiller density. Cutting at 10 cm caused a decrease in total dry matter production, underestimating the potential production. Cutting heights between 20 and 30 cm contributed positively to increase the total number of leaves, number of green leaves, average size of the leafs and total dry matter production. Under the present experimental conditions, cutting around 40 cm was not recommended because of a decreasing in the leaf/stem ratio and a increasing in stem fraction and dry matter content, compromising the structure of the canopy.

Immune-mediated hemolytic anemia - report of three cases / Anemia hemolítica imunomediada em c es - relato de três casos
Joo Henrique Atero de Carvalho Leite,Luciana Curotto Nolasco de Carvalho,Patricia Mendes Pereira
Semina : Ciências Agrárias , 2011,
Abstract: Immune-mediated hemolytic anemia (IMHA) is a common type of anemia in dogs and cats. The disease é most common in middle-aged female dogs, especially American Cocker Spaniel. The clinical signs are associated with severe anemia. There is no pathognomonic test for IMHA, but the presence of hemolytic anemia in a young adult or middle age, autoagglutination and spherocytosis or positive results of Coombs test, elimination of any other underlying cause of anemia and an appropriate response to immunosuppressive therapy are suggestive of it. The aim of the present paper is to report of three cases of serious IMHA, and highlighting the therapeutic modalities and prognosis associated with them. A anemia hemolítica imunomediada (AHIM) é um tipo comum de anemia em c es e gatos. A doen a é mais comum em fêmeas caninas de meia-idade, especialmente Cocker Spaniel Americano. Os sinais clínicos est o associados com a anemia severa. N o há achados patognom nicos, mas a presen a de anemia hemolítica em um c o jovem ou de meia idade, auto-aglutina o e esferócitos ou teste de Coombs positivo, elimina o de outros diagnósticos diferenciais e a resposta apropriada a terapia imunossupressora indicam AHIM. Apesar de inúmeras op es terapêuticas, os índices de mortalidade permanecem elevados. O objetivo do presente trabalho é relatar três casos graves de AHIM, ressaltando as modalidades terapêuticas e o prognóstico associado a elas.
Evolu??o de atributos físicos de solo em sistema de integra??o lavoura-pecuária
Conte, Osmar;Flores, Joo Paulo Cassol;Cassol, Luís César;Anghinoni, Ibanor;Carvalho, Paulo César de Faccio;Levien, Renato;Wesp, Cristiane de Lima;
Pesquisa Agropecuária Brasileira , 2011, DOI: 10.1590/S0100-204X2011001000026
Abstract: the objective of this work was to assess the effect of sward height and successive grazing cycles over soil physical attributes in an integrated crop-livestock system. the experiment was established in 2001, in the planalto médio region, rs, brazil, in a rhodic hapludox (oxisol), with annual ryegrass (lolium multiflorum) intercropped with black oat (avena strigosa), under continuous grazing, during the winter, and single cropped soybean (glycine max) during the summer. the treatments consisted of different grazing intensities, determined by sward height (10, 20, 30, and 40 cm), and a no-grazing area was used as a control. soil bulk density and soil porosity were evaluated at the end of the grazing and soybean cycles, as well as soil resistance to mechanic penetration and aggregate stability in the seventh year of the experiment. no significant differences were found on soil bulk density and soil porosity after seven years under crop-livestock integration. soil resistance to penetration is higher on the superficial layer after the grazing cycle. soil aggregation increases in grazing areas, regardless of grazing intensities.
Eficácia do tratamento Ovsynch associado à insemina o artificial prefixada em rebanhos Bos taurus e Bos indicus
Alvarez Rafael Herrera,Martinez Antonio Campanha,Carvalho Joo Batista Pereira de,Arcaro Juliana Rodrigues Pozzi
Pesquisa Agropecuária Brasileira , 2003,
Abstract: O presente trabalho objetivou avaliar a eficácia do tratamento Ovsynch associado à insemina o artificial em tempo prefixado em vacas Bos taurus e Bos indicus. Foram utilizados rebanhos das ra as Holandesa, Caracu, Nelore e Mantiqueira. Também foi incluído um rebanho de vacas Gir, com problemas de fertilidade. Cada rebanho foi dividido em três grupos. O grupo 1 recebeu o tratamento Ovsynch e foi inseminado em tempo prefixado. O grupo 2 foi inseminado no cio induzido com cloprostenol. O grupo 3 foi inseminado no cio natural. As taxas de concep o e de prenhez foram determinadas por ultra-sonografia. N o existiu intera o significativa das variáveis reprodutivas analisadas para rebanho, idade, período pós-parto, número de pari o e presen a do bezerro. A taxa de concep o n o diferiu (P>0,05) entre os grupos, ao passo que a taxa de prenhez foi superior (P<0,05) nos grupos 1 e 2 em compara o ao grupo 3. No rebanho Gir, o tratamento Ovsynch n o alterou a taxa de concep o nem a de prenhez. Independentemente da ra a, os tratamentos Ovsynch e cloprostenol n o afetam a taxa de concep o, mas melhoram a taxa de prenhez. O tratamento Ovsynch n o aumenta a fertilidade de vacas com problemas reprodutivos inespecíficos.
Estudo de rajadas de ventos e dire??es predominantes em Lavras, Minas Gerais, por meio da distribui??o gama
Bueno, Renato Candido;Carvalho, Luiz Gonsaga de;Vianello, Rubens Leite;Marques, Joo José Granate de Sá e Melo;
Ciência e Agrotecnologia , 2011, DOI: 10.1590/S1413-70542011000400019
Abstract: the present work was carried out in order to study the ccurrence probabilities o of extreme winds and their predominant directions in the region of lavras, minas gerais state, brazil. the data were collected from graphic registrations of the universal anemograph of the principal climatological station of lavras, located in the campus of the federal university of lavras. with the available data (139 months), in the period of january/1988 to may/2004, the adjustment by gamma distribution was verified for this data series applying the χ2 test to the 5% probability. estimates of the occurrence probabilities of wind gust equal or above 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100 km h-1 were determined for each month. it was verified that the months of september to february presented strong winds with probabilities higher than the other months. for very strong winds, above 100 km h-1, the occurrence probabilities were minimum for all months of the year. it was observed that the predominant wind gust direction were east and west in relation to the others.
Estabilidade de agregados e distribui??o de carbono e nutrientes em Argissolo sob aduba??o organica e mineral
Matos, Eduardo da Silva;Mendon?a, Eduardo de Sá;Leite, Luiz Fernando Carvalho;Galv?o, Joo Carlos Cardoso;
Pesquisa Agropecuária Brasileira , 2008, DOI: 10.1590/S0100-204X2008000900017
Abstract: the aim of this work was to evaluate the effect of mineral and organic fertilization on the soil-water aggregate stability and on the distribution of c, n and p in different classes of aggregates in an acrisol. the treatments were 0 and 40 m3 ha-1 per year of organic fertilizer and 0, 250 and 500 kg ha-1 of mineral fertilizer n-p-k of the formula 4-14-8. an area under atlantic forest was used as reference. soil samples were collected at 0-10 and 10-20 cm depths. the distribution of aggregates showed the highest values from 4 to 2 mm. in the organic fertilizer treatment, the aggregates 4-2 mm corresponded to 39.7% of the total on the soil. for the aggregates 4-2 and 0.105-0.25 mm, the total organic carbon contents were 17.5 and 36.7% higher in the organic fertilizer treatments. the organic fertilization contributed to values of n and p of 43 and 38.7% (0-10 cm) and 35.4 and 36.8% (10-20 cm), which were higher than the treatments without organic fertilizer. the carbon/nitrogen ratio did not vary among the aggregate classes in the same treatment. however, the carbon/phosphorus ratio was reduced with the use of organic and mineral fertilizer. the indexes of aggregates stability were positively correlated with the content of total organic carbon in the 4-2 mm.
Page 1 /284778
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.