44 research outputs found
Dissomphalus pyata Colombo & Azevedo, sp. nov.
No full textDissomphalus pyata Colombo & Azevedo, sp. nov. (Figs 11, 147–149) Description. Male. Head and mesosoma black; metasoma dark castaneous or black. Mandible with two apical teeth; median clypeal lobe trapezoidal, median tooth weakly triangular; frons weakly coriaceous, punctate. Pronotal disc coriaceous. T2 without tergal process. Posterior hypopygeal margin straight. Genitalia: paramere small in dorsal view, apex rounded, larger than basiparamere; aedeagal ventral ramus smaller than dorsal body, apex weakly bifurcated, laminar; aedeagal dorsal body with one pair of apical lobes, inner pair with apex narrow in dorsal view, membranous; basal process larger than apical lobes, wide; apodeme extending beyond genital ring. Female unknown. Remarks. This species is allocated in amplus species-group by having the tergal process absent. This species not is similar other of species-group. This species is mainly different because has the aedeagal ventral ramus with apex weakly bifurcated and aedeagal dorsal body with basal process larger than apical lobes. Material examined. Types: Holotype Ƌ, BR[AZIL], E[spírito] S[anto]: Domingos Martins, Par [que] Est [adual] Pedra Azul, 20º25’55’’S 41º00’53’’W, 26.VIII–02.IX.2003, Arm [adilha] Malaise, C. O Azevedo & eq[uipe] col. (UFES). Paratypes: BRAZIL, Espírito Santo: 1Ƌ, Santa Maria de Jetibá, Fazenda Clarindo Kruguer, 20º0/4’S 40º44’53’’W, 29.XI–06.XII.2002, armadilha Malaise, Tavares, Azevedo e equipe col. (UFES); 4♂, Domingos Martins, Par [que] Est [adual] Pedra Azul, 20º25’55’’S 41º00’53’’W, 26.VIII–02.IX.2003, Arm [adilha] Malaise, C. O Azevedo & eq[uipe] col. (UFES). Etymology. The epithet pyata refers to strong in Tupi-Guarani. Distribution. Brazil (Espírito Santo).Published as part of Colombo, Wesley D. & Azevedo, Celso O., 2016, Review of Dissomphalus Ashmead, 1893 (Hymenoptera, Bethylidae) from Espíri- to Santo, Brazil, with description of twenty-one new species, pp. 1-84 in Zootaxa 4143 (1) on page 41, DOI: 10.11646/zootaxa.4143.1.1, http://zenodo.org/record/26075
A relação entre o risco de falência e a rendibilidade das ações: evidência europeia
No full textO presente estudo analisa a relação existente entre o risco de falência e a rendibilidade das ações, no contexto das empresas europeias. Pretende-se verificar se as empresas com baixo risco de falência têm rendibilidades baixas ou se as empresas com alto risco de falência apresentam rendibilidades altas. Para responder às duas questões de investigação, foi estudada uma amostra de 323 empresas pertencentes ao índice europeu Stoxx Europe 600, ao longo de 10 anos de análise (entre janeiro de 2010 e dezembro de 2019).
Para medir o risco de falência foi utilizado o modelo EDF de Bharath e Shumway (2008). Com base neste, dividiu-se a amostra em três portfólios: ações com baixo, médio e alto risco de falência. As rendibilidades das carteiras de teste foram ajustadas com recurso ao modelo de Fama e French (1993).
Os resultados do estudo evidenciaram que as empresas com alto risco de falência apresentam rendibilidades baixas e que as empresas com baixo risco de falência apresentam rendibilidades altas, sugerindo uma relação negativa entre o risco de falência e a rendibilidade. Os nossos resultados são consistentes com os resultados de Garlappi, Shu e Yan (2008)
PLANT-TO-SEED TRANSMISSION of CURTOBACTERIUM FLACCUMFACIENS pv. FLACCUMACIENS IN A DRY BEAN CULTIVAR
No full textBacterial Wilt is a disease that Causes serious bean crop losses in Brazil, and its causal agent, the bacterium Curto-bacterium flaccumfaciens pv. flaccumfaciens QA is seed transmitted. Recommendations for managing the disease in the field include the use of pathogen-free seed, crop rotation, and resistant cultivars of dry bean. Transmission of Cff from plant to seed Was evaluated in three assays With six different dry bean cultivars (IAC Carioca, IAC Carioca Arua IAC Carioca Akyta, IAC Carioca Pyata IAC Carioca Tybata, and Perola) Plants of these cultivars were Inoculated with a Cff isolate by stern puncture and the disease symptoms were evaluated using,I scale. To assess bacterial transmission to seeds, three assays were made analysing in each 500 seeds of the cultivars IAC Carioca, IAC Carioca Arua, IAC Carioca Akyta, IAC Carioca Pyata, and IAC Carioca Tybata respectively, whereas for the cv Perola 46, 1.55, and 87 seeds were analysed in the first, second, and third assay, respectively These seeds were macerated individually in distilled and sterilized Water, and soaked for 24 h at 5 degrees C. The resulting, suspension was streaked oil Petri dishes containing semi-selective medium for Cff, and incubated at 28 degrees C for 96 to 120 h. Typical colonies for Cff Were purified oil 7 % NSA+NaCl medium, after which Grain staining, KOH, and pathogenicity tests Were conducted. Isolates from the first and second assays were characterized by Micrology2 (TM) L,, and those of the third assay with PCR. Results showed that on cvs IAC Carioca Arua, IAC Carioca Akyta, IAC Carioca Pyata, and IAC Carioca Tybata low levels of disease developed, indicating resistance to bacterial Wilt, whereas cvs Perola and IAC Carioca were highly susceptible in all the assays. With respect to transmission of Cff from plants to seeds, cvs IAC Carioca Akyta, IAC Carioca Pyata, and IAC Carioca Tybata showed no transmission, Whereas IAC Carioca Arua showed a 5.5-14.8% level of transmission. Cvs IAC Carioca and Perola showed the highest levels of transmission, namely 10 4-70% and 32.6.1-74.2%, respectivelyFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq
PLANT-TO-SEED TRANSMISSION of CURTOBACTERIUM FLACCUMFACIENS pv. FLACCUMACIENS IN A DRY BEAN CULTIVAR
No full textBacterial Wilt is a disease that Causes serious bean crop losses in Brazil, and its causal agent, the bacterium Curto-bacterium flaccumfaciens pv. flaccumfaciens QA is seed transmitted. Recommendations for managing the disease in the field include the use of pathogen-free seed, crop rotation, and resistant cultivars of dry bean. Transmission of Cff from plant to seed Was evaluated in three assays With six different dry bean cultivars (IAC Carioca, IAC Carioca Arua IAC Carioca Akyta, IAC Carioca Pyata IAC Carioca Tybata, and Perola) Plants of these cultivars were Inoculated with a Cff isolate by stern puncture and the disease symptoms were evaluated using,I scale. To assess bacterial transmission to seeds, three assays were made analysing in each 500 seeds of the cultivars IAC Carioca, IAC Carioca Arua, IAC Carioca Akyta, IAC Carioca Pyata, and IAC Carioca Tybata respectively, whereas for the cv Perola 46, 1.55, and 87 seeds were analysed in the first, second, and third assay, respectively These seeds were macerated individually in distilled and sterilized Water, and soaked for 24 h at 5 degrees C. The resulting, suspension was streaked oil Petri dishes containing semi-selective medium for Cff, and incubated at 28 degrees C for 96 to 120 h. Typical colonies for Cff Were purified oil 7 % NSA+NaCl medium, after which Grain staining, KOH, and pathogenicity tests Were conducted. Isolates from the first and second assays were characterized by Micrology2 (TM) L,, and those of the third assay with PCR. Results showed that on cvs IAC Carioca Arua, IAC Carioca Akyta, IAC Carioca Pyata, and IAC Carioca Tybata low levels of disease developed, indicating resistance to bacterial Wilt, whereas cvs Perola and IAC Carioca were highly susceptible in all the assays. With respect to transmission of Cff from plants to seeds, cvs IAC Carioca Akyta, IAC Carioca Pyata, and IAC Carioca Tybata showed no transmission, Whereas IAC Carioca Arua showed a 5.5-14.8% level of transmission. Cvs IAC Carioca and Perola showed the highest levels of transmission, namely 10 4-70% and 32.6.1-74.2%, respectivelyFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq
PLANT-TO-SEED TRANSMISSION of CURTOBACTERIUM FLACCUMFACIENS pv. FLACCUMACIENS IN A DRY BEAN CULTIVAR
No full textBacterial Wilt is a disease that Causes serious bean crop losses in Brazil, and its causal agent, the bacterium Curto-bacterium flaccumfaciens pv. flaccumfaciens QA is seed transmitted. Recommendations for managing the disease in the field include the use of pathogen-free seed, crop rotation, and resistant cultivars of dry bean. Transmission of Cff from plant to seed Was evaluated in three assays With six different dry bean cultivars (IAC Carioca, IAC Carioca Arua IAC Carioca Akyta, IAC Carioca Pyata IAC Carioca Tybata, and Perola) Plants of these cultivars were Inoculated with a Cff isolate by stern puncture and the disease symptoms were evaluated using,I scale. To assess bacterial transmission to seeds, three assays were made analysing in each 500 seeds of the cultivars IAC Carioca, IAC Carioca Arua, IAC Carioca Akyta, IAC Carioca Pyata, and IAC Carioca Tybata respectively, whereas for the cv Perola 46, 1.55, and 87 seeds were analysed in the first, second, and third assay, respectively These seeds were macerated individually in distilled and sterilized Water, and soaked for 24 h at 5 degrees C. The resulting, suspension was streaked oil Petri dishes containing semi-selective medium for Cff, and incubated at 28 degrees C for 96 to 120 h. Typical colonies for Cff Were purified oil 7 % NSA+NaCl medium, after which Grain staining, KOH, and pathogenicity tests Were conducted. Isolates from the first and second assays were characterized by Micrology2 (TM) L,, and those of the third assay with PCR. Results showed that on cvs IAC Carioca Arua, IAC Carioca Akyta, IAC Carioca Pyata, and IAC Carioca Tybata low levels of disease developed, indicating resistance to bacterial Wilt, whereas cvs Perola and IAC Carioca were highly susceptible in all the assays. With respect to transmission of Cff from plants to seeds, cvs IAC Carioca Akyta, IAC Carioca Pyata, and IAC Carioca Tybata showed no transmission, Whereas IAC Carioca Arua showed a 5.5-14.8% level of transmission. Cvs IAC Carioca and Perola showed the highest levels of transmission, namely 10 4-70% and 32.6.1-74.2%, respectivelyFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Univ Estadual Paulista, UNESP, Fac Ciencias Agron, Dept Prod Vegetal, BR-18603970 São Paulo, BrazilUniv Estadual Paulista, UNESP, Fac Ciencias Agron, Dept Prod Vegetal, BR-18603970 São Paulo, Brazi
Identification of resistance sources of bacterial wilt in common bean landraces, collected in Santa Catarina
No full textIt was evaluated the reaction of 73 common bean land races, collected in Santa Catarina State, to the bacterial wilt, caused by Curtobacterium flaccumfaciens pv. flaccumfaciens. The experiments were set up under greenhouse conditions and the cultivars IAC Carioca Pyata and IPR 88 - Uirapuru were the resistant and susceptible standards, respectively. The inoculation with the strain FJ 36 was done in the 10(th) day after the sowing and the disease evaluations were at the 10, 14, 21 and 28(th) day after the inoculation. The landraces Mouro Piratuba (color bean group) and Vagem Amarela (black bean group) were identified as resistance sources of bacterial wilt of bean.UFMS, Campus Chapada Sul CPCS, BR-79560000 Chapadao Do Sul, MS, BrazilUniv Comunitaria Reg Chapeco UNOCHAPECO, BR-89809000 Chapeco, SC, BrazilUniv Estadual Paulista, FCA, Dept Prod Vegetal, Setor Defesa Fitossanitaria, BR-18603970 Botucatu, SP, BrazilUniv Estadual Paulista, FCA, Dept Prod Vegetal, Setor Defesa Fitossanitaria, BR-18603970 Botucatu, SP, Brazi
Revisão taxonômica de Dissomphalus Ashmead 1893 (Hymenoptera, Bethylidae) no Espírito Santo, Brasil.
No full textForty-two species of Dissomphalus Ashmead, 1893 are reviewed, 21 of them are described and illustrated: Dissomphalus botocudus sp. nov., D. fredi sp. nov., D. tupinikim sp. nov., D. guarani sp. nov., D. congo sp. nov., D. rosangelae sp. nov., D. waedeagus sp. nov., D. amana sp. nov., D. potyra sp. nov., D. pyata sp. nov., D. clovisi sp. nov., D. kuara sp. nov., D. miriamae sp. nov., D. cacirus sp. nov., D. mirim sp. nov., D. secretus sp. nov., D. caparao sp. nov., D. capixaba sp. nov., D. ibirapitanga sp. nov., D. purius sp. nov. and D. taiabocu sp. nov. Six species are registered for the first time from Espírito Santo: D. brasiliensis Kieffer, D. bahiensis Redighieri & Azevedo, D. dumosus Evans, D. incomptus Evans, D. refertus Alencar & Azevedo and D. umbilicus Azevedo. Three species were reidentified: D. napo Evans, D. truncatus Azevedo and D. vallensis Azevedo. Among fifteen species-groups which recognized in the genus in Espírito Santo, amana species-group; amplus species-group and secretus species-group are newly proposed.Quarenta e duas espécies de Dissomphalus Ashmead, 1893 são revisadas, 21
espécies são descritas e ilustradas: Dissomphalus botocudus sp. nov., D. fredi sp. nov.,
D. tupinikim sp. nov., D. guarani sp. nov., D. congo sp. nov., D. rosangelae sp. nov., D.
w-aedeagus sp. nov., D. amana sp. nov., D. potyra sp. nov., D. pyata sp. nov., D. clovisi
sp. nov., D. kuara sp. nov., D. miriamae sp. nov., D. cacirus sp. nov., D. mirim sp. nov.,
D. secretus sp. nov., D. caparao sp. nov., D. capixaba sp. nov., D. ibirapitanga sp. nov.,
D. purius sp. nov. e D. taiabocu sp. nov. Seis espécies são registradas pela primeira vez
para o Espírito Santo: D. brasiliensis Kieffer, D. bahiensis Redighieri & Azevedo, D.
dumosus Evans, D. incomptus Evans, D. refertus Alencar & Azevedo e D. umbilicus
Azevedo. Três espécies são reidentificadas: D. napo Evans, D. truncatus Azevedo e D.
vallensis Azevedo. Dos 15 grupos de espécies registrados para o gênero no Espírito Santo,
os grupos de espécies amplus, secretus e amana são aqui propostos
