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Search Results: 1 - 10 of 179569 matches for " Raul Guerra de;Ward "
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External morphology of sensory structures of fourth instar larvae of neotropical species of phlebotomine sand flies (Diptera: Psychodidae) under scanning electron microscopy
Pessoa, Felipe Arley Costa;Queiroz, Raul Guerra de;Ward, Richard Douglas;
Memórias do Instituto Oswaldo Cruz , 2001, DOI: 10.1590/S0074-02762001000800013
Abstract: in the present study, some morphological structures of antennae, maxillary palps and caudal setae of fourth instar larvae of laboratory-reared phlebotomine sand flies (lutzomyia longipalpis, l. migonei, l. evandroi, l. lenti, l. sericea, l. whitmani and l. intermedia) of the state of ceará, brazil, were examined under scanning electron microscopy. the antennal structures exhibited considerable variation in the morphology and position. a prominent digitiform distal segment has been observed only on the antenna of species of the subgenus nyssomyia. the taxonomic relevance of this and other antennal structure is discussed. the papiliform structures found in the maxillae and the porous structures of the caudal setae of all species examined may have chemosensory function. further studies with transmission electron microscopy are needed to better understand the physiological function of these external structures.
Posterior spiracles of fourth instar larvae of four species of phlebotomine sand flies (Diptera: Psychodidae) under scanning electron microscopy
Pessoa, Felipe Arley Costa;Queiroz, Raul Guerra de;Ward, Richard Douglas;
Memórias do Instituto Oswaldo Cruz , 2000, DOI: 10.1590/S0074-02762000000500013
Abstract: in the present study, posterior spiracles of laboratory-reared fourth instar larvae of lutzomyia longipalpis, l. migonei, l. lenti, and l. whitmani (diptera: psychodidae) of the state of ceará, brazil, were examined under scanning electron microscopy. the number of papillae of spiracles examined varied according to the species examined, but no intraspecific differences were found. the importance of this structure to sand fly larva identification and phylogeny is commented.
External morphology of sensory structures of fourth instar larvae of neotropical species of phlebotomine sand flies (Diptera: Psychodidae) under scanning electron microscopy
Pessoa Felipe Arley Costa,Queiroz Raul Guerra de,Ward Richard Douglas
Memórias do Instituto Oswaldo Cruz , 2001,
Abstract: In the present study, some morphological structures of antennae, maxillary palps and caudal setae of fourth instar larvae of laboratory-reared phlebotomine sand flies (Lutzomyia longipalpis, L. migonei, L. evandroi, L. lenti, L. sericea, L. whitmani and L. intermedia) of the State of Ceará, Brazil, were examined under scanning electron microscopy. The antennal structures exhibited considerable variation in the morphology and position. A prominent digitiform distal segment has been observed only on the antenna of species of the subgenus Nyssomyia. The taxonomic relevance of this and other antennal structure is discussed. The papiliform structures found in the maxillae and the porous structures of the caudal setae of all species examined may have chemosensory function. Further studies with transmission electron microscopy are needed to better understand the physiological function of these external structures.
Posterior spiracles of fourth instar larvae of four species of phlebotomine sand flies (Diptera: Psychodidae) under scanning electron microscopy
Pessoa Felipe Arley Costa,Queiroz Raul Guerra de,Ward Richard Douglas
Memórias do Instituto Oswaldo Cruz , 2000,
Abstract: In the present study, posterior spiracles of laboratory-reared fourth instar larvae of Lutzomyia longipalpis, L. migonei, L. lenti, and L. whitmani (Diptera: Psychodidae) of the State of Ceará, Brazil, were examined under scanning electron microscopy. The number of papillae of spiracles examined varied according to the species examined, but no intraspecific differences were found. The importance of this structure to sand fly larva identification and phylogeny is commented.
Avalia o de cultivares de soja, sob manejo organico, para fins de aduba o verde e produ o de gr os
Padovan Milton Parron,Almeida Dejair Lopes de,Guerra José Guilherme Marinho,Ribeiro Raul de Lucena Duarte
Pesquisa Agropecuária Brasileira , 2002,
Abstract: O objetivo deste trabalho foi avaliar o desempenho de seis cultivares de soja, sob manejo organico, para fins de aduba o verde e produ o de gr os. Utilizou-se delineamento experimental de blocos casualizados, com quatro repeti es por tratamento (cultivar). Na época da colheita, 81 dias após a emergência das plantulas, todas as cultivares testadas (Celeste, Surubi, Campo Grande, Mandi, Lambari e Taquari) mostraram excelente nodula o, variando de 545 a 760 mg/planta de massa nodular seca. As cultivares Celeste e Taquari, que produziram, respectivamente, 8,33 e 7,12 t ha-1 de biomassa seca da parte aérea, apresentaram outras características agron micas vantajosas, tais como: ciclo curto, alta acumula o de nutrientes (N, P, K, Ca e Mg) nos tecidos verdes e bom rendimento de sementes. Esses caracteres indicam potencial de 'Celeste' e 'Taquari' para aduba o verde de ver o em sistemas de agricultura organica. Cinco das cultivares avaliadas revelaram tendência ao acamamento, porém dentro de níveis aceitáveis. As cultivares Celeste, Surubi, Campo Grande, Mandi e Taquari suplantaram em 23%, 32%, 33%, 44% e 70%, respectivamente, a média nacional de produtividade de soja, estimada em 2.398 kg ha-1 nas últimas três safras.
Avalia??o de cultivares de soja, sob manejo organico, para fins de aduba??o verde e produ??o de gr?os
Padovan, Milton Parron;Almeida, Dejair Lopes de;Guerra, José Guilherme Marinho;Ribeiro, Raul de Lucena Duarte;Ndiaye, Aly;
Pesquisa Agropecuária Brasileira , 2002, DOI: 10.1590/S0100-204X2002001200005
Abstract: the objective of this work was to evaluate the grain and aboveground biomass production of six soybean cultivars under organic management. a randomized block design was adopted with four replications per treatment (cultivar). by harvest time, 81 days after plants emergence, all tested cultivars (celeste, surubi, campo grande, mandi, lambari, and taquari) had excellent nodulation ranging from 545 to 760 mg/plant of nodule mass (dry weight). the cultivars celeste and taquari, which yielded 8.33 and 7.12 t ha-1 of dry biomass, respectively, showed other advantageous agronomic characteristics such as: short cycle, a high accumulation of nutrients (n, p, k, ca and mg) in green tissues, and good seed setting. these traits indicated potential of 'celeste' and 'taquari' to be used as green manure summer crops in organic agriculture systems. five of the cultivars revealed a tendency for lodging, however within acceptable levels. cultivars celeste, surubi, campo grande, mandi, and taquari exceeded in 23%, 32%, 33%, 44%, and 70%, respectively, the brazilian soybean grain yield average of 2,398 kg ha-1 of the last three years.
Consórcios de caupi e milho em cultivo organico para produ??o de gr?os e espigas verdes
Guedes, Rejane E;Rumjanek, Norma G;Xavier, Gustavo R;Guerra, José Guilherme M;Ribeiro, Raul de LD;
Horticultura Brasileira , 2010, DOI: 10.1590/S0102-05362010000200006
Abstract: covering the period of autumn-winter-spring of 2007, a study was performed in seropédica, metropolitan region of rio de janeiro state, brazil, to evaluate different intercroppings between cowpea (cv. mauá) and corn (cv. ag-1051) under organic farming system. the experiment was carried out in an area of ultisol employing a randomized block design with four replicates. treatments consisted of four intervals of cowpea sowing, as follows: (e1) 21 days prior to corn; (e2) 14 days prior to corn; (e3) 7 days prior to corn; and (e4) cowpea and corn sowed on the same day. sole crops of cowpea and corn were included, both sown along with treatment e4. intercropping with cowpea did not affect corn yield as immature (green) spikes and also had no influence in terms of the spikes basal diameter and length, regardless the intervals between sowing dates. as for cowpea, the sole crop productivity in green beans was superior to its intercropping with corn. the data obtained for the area equivalency index (aei), higher than 1.0 in all cases, indicated that intercrops were efficient in agronomic/biological terms. considering, in addition, the yield of each component crop intercropping, cowpea sowing 21 days preceding corn was most adequate to the organic management adopted under regional conditions.
Desempenho da alface em cultivo organico com e sem cobertura morta e diferentes laminas d'água
Lima, Márcio Emanoel de;Carvalho, Daniel Fonseca de;Souza, Adilson Pacheco de;Guerra, José Guilherme Marinho;Ribeiro, Raul de Lucena Duarte;
Ciência e Agrotecnologia , 2009, DOI: 10.1590/S1413-70542009000600007
Abstract: this work was carried out in order to evaluate the performance of a lettuce crop (lactuca sativa l.) cultivated under different irrigation depths in ground with and without covering of gliricidia leguminosa. two simultaneous experiments were conducted, in which 5 irrigation depths were applied, corresponding to 25, 50, 80, 100, and 115% of crop evapotranspiration (etc). final production was evaluated by means of the determination of fresh mass and leaf area. up to the 100% etc level, all the analyzed variables had their values increased. for the 115% level, there was a decrease of the same. in total fresh mass production, the system with covering was superior to the one without covering, not differentiating statistically to the 5% level probability for test f, except at depths of 25 and 115% etc.
Manejo da irriga??o associada a coberturas mortas vegetais no cultivo organico da beterraba
Carvalho, Daniel F. de;Oliveira Neto, Dionizio H. de;Ribeiro, Raul de L. D.;Guerra, José G. M.;Rouws, Janaína R. C.;
Engenharia Agrícola , 2011, DOI: 10.1590/S0100-69162011000200007
Abstract: organic farming practices, like mulching, were tested in drip irrigated area in baixada fluminense, state of rio de janeiro, brazil. in this region, the winter crop of sugar beet is favored by mild temperatures, coinciding with the period of higher product availability in the state. for the beet planting were used three soil management practices (different conditions of coverage). in each one, six irrigation depth(0, 29, 48, 78, 100 and 148% of etc), estimated based on soil water balance using tdr technique were applied through drip of different flow rates. moreover, it was also included a plot without irrigation. the statistical design used was randomized blocks with six treatments. under mulch of pennisetum purpureum, gliricidia sepium and without mulching, the maximum values of wue in beet planting, were 40.25, 25.63, 26.08 kg m-3, respectively. the higher depth accumulated in the treatment relative to 29% of etc (951 m3 ha-1) was obtained in plots without mulch. the nitrogen accumulated in the plant was higher in the experiment with gliricidia mulching, indicating advantages of this cultural practice associated with drip irrigation.
Desempenho do inhame (taro) em plantio direto e no consórcio com crotalária, sob manejo organico
Oliveira, Fábio Luiz de;Ribeiro, Raul de L.D.;Silva, Vinícius V.;Guerra, José Guilherme M.;Almeida, Dejair L. de;
Horticultura Brasileira , 2004, DOI: 10.1590/S0102-05362004000300028
Abstract: an experiment was carried out in the upland region of rio de janeiro state, brazil, to evaluate different planting systems on yam performance under organic management. a randomized blocks design was used with four replications, in a 2 x 2 factorial scheme comprising the treatments: soil tillage system (no-tillage or conventional) and cropping system (monoculture or intercropping with crotalaria juncea). intercropping with c. juncea (sun hemp) stimulated yam vegetative growth and reduced leaf blight caused by sun radiation. the weed population was reduced more effectively associating no-tillage and intercropping with sun hemp. none of the treatments affected yam yield, which was considered satisfactory indicating the potential of the organic management adopted.
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