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Search Results: 1 - 10 of 378422 matches for " Nivia da S.;Costa "
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First report and morphological redescription of Teleonemia morio (St?l) (Hemiptera, Tingidae) in Annona squamosa L. (Annonaceae) in Brazil
Broglio, S?nia M. F.;Dias-Pini, Nivia da S.;Costa, Luiz A. A.;Lemos, Eurico E. P.;
Revista Brasileira de Entomologia , 2012, DOI: 10.1590/S0085-56262012005000003
Abstract: first report and morphological redescription of teleonemia morio (st?l) (hemiptera, tingidae) in annona squamosa l. (annonaceae) in brazil. this is the first report of a severe attack of teleonemia morio (st?l, 1855) (hemiptera, heteroptera, tingidae) on annona squamosa l. (custard apple), causing up to 80% of losses of infested trees. in order to facilitate the identification of this insect pest, the adult female of t. morio is redescribed based on specimens collected in palmeira dos índios, alagoas, brazil.
Ocorrência de Telenomus alecto Crawford, 1914 (Hymenoptera: Scelionidae) em ovos de Diatraea spp. (Lepidoptera: Crambidae) em cana-de-a úcar no estado de Alagoas, Brasil Occurrence of Telenomus alecto Crawford, 1914 (Hymenoptera: Scelionidae) in eggs of Diatraea spp. (Lepidoptera: Crambidae) in sugar cane in the stateof Alagoas, Brazil
Nivia da Silva Dias,S?nia Maria Forti Broglio-Micheletti,Natália Rafaella de Moraes Farias,Simone Silva da Costa
IDESIA , 2011,
Abstract: O objetivo deste trabalho foi verificar a ocorrência natural de T. alecto, parasitóide de ovos de Diatraea spp. em cana-de-a úcar no Estado de Alagoas. As posturas de D. flavipennella e D. saccharalis apresentaram 47,9% e 30,0% dos ovos com características de parasitismo e viabilidade de 92,4% e 89,9%, respectivamente. A presen a deste inimigo natural sugere um potencial de regula o natural de Diatraea spp. The objective of this study was to investigate the natural occurrence of T. alecto, an egg parasitoid of Diatraea spp. in sugar cane in the State of Alagoas. The eggs of D. flavipennella and D. saccharalis presented 47.9% and 30.0% with characteristics of parasitism, and viabilities of 92.4% and 89.9%, respectively. The presence of this natural enemy suggests a potential for natural regulation of Diatraea spp.
Ocorrência de Telenomus alecto Crawford, 1914 (Hymenoptera: Scelionidae) em ovos de Diatraea spp. (Lepidoptera: Crambidae) em cana-de-a?úcar no estado de Alagoas, Brasil
da Silva Dias,Nivia; Forti Broglio-Micheletti,S?nia Maria; de Moraes Farias,Natália Rafaella; Silva da Costa,Simone; dos Santos,Jakeline Maria; Peixoto Lopes,Diego Olympio; Costa,Valmir Antonio;
Idesia (Arica) , 2011, DOI: 10.4067/S0718-34292011000300014
Abstract: the objective of this study was to investigate the natural occurrence of t. alecto, an egg parasitoid of diatraea spp. in sugar cane in the state of alagoas. the eggs of d. flavipennella and d. saccharalis presented 47.9% and 30.0% with characteristics of parasitism, and viabilities of 92.4% and 89.9%, respectively. the presence of this natural enemy suggests a potential for natural regulation of diatraea spp.
Sele??o de hospedeiro alternativo para três espécies de tricogramatídeos neotropicais
Dias, Nivia da Silva;Parra, José Roberto Postali;Lima, Tiago Cardoso da Costa;
Pesquisa Agropecuária Brasileira , 2008, DOI: 10.1590/S0100-204X2008001100004
Abstract: the objective of this work was to assess the biological characteristics of the parasitoids trichogrammatoidea annulata, trichogramma atopovirilia e trichogramma bruni, reared on factitious hosts, through different generations, in order to select the best host for parasitoid mass rearing. the experiment was carried out in a completely randomized design, in a 3x3 factorial arrangement (three hosts - anagasta kuehniella, corcyra cephalonica and sitotroga cerealella - and three generations - 1st, 10th and 28th). evaluations were made for: the total parasitized eggs by each female; viability; longevity of male and female; duration of the egg-adult period; sexual ratio; and viability of the parasitoids. the parasitoids trichogrammatoidea annulata and trichogramma bruni showed better development on c. cephalonica. for trichogramma atopovirilia, the factitious host can be either c. cephalonica or a. kuehniella. the host s. cerealella was the least indicated for the three parasitoids species. the evaluated trichogrammatids showed adaptative capacity to their preferential factitious host, through generations.
The Dwarf Spheroidal Galaxies in the Galactic Halo
G. S. Da Costa
Physics , 1999,
Abstract: In the first part of this contribution the observed velocity dispersions in Galactic halo dwarf spheroidal (dSph) galaxies are reviewed, and the consequences for dark matter content outlined. The results are suggestive of a dSph dark matter mass of ~2x10^7 solar masses, independent of the luminosity of the dSph. Alternatives to the dark matter interpretation are also briefly discussed. In the second part of the contribution the emphasis is on the stellar populations of Galactic dSphs. Recent results for the ages of the oldest populations are presented. These data, together with similar recent results for Galactic halo and LMC globular clusters, indicate that regardless of the subsequent star formation history, the initial epoch of star formation was well synchronized throughout the entire proto-Galactic halo. The implications of the first high dispersion studies of element abundance ratios in Galactic dSph red giants are also discussed. For the Sagittarius dSph in particular, the observed abundance ratios show good agreement with expectations for an episodic star formation history, and such a history is in fact deduced from colour-magnitude diagrams studies.
The dynamics of the outer parts of omega Centauri
G. S. Da Costa
Physics , 2012, DOI: 10.1088/0004-637X/751/1/6
Abstract: The multi-object fibre-fed spectrograph AAOmega at the Anglo-Australian Telescope has been used to establish and measure accurate (<1 kms-1) radial velocities for a new sample of members in the outer parts of the stellar system omega Centauri. The new sample more than doubles the number of known members with precise velocities that lie between 25' and 45' from the cluster center. Combining this sample with earlier work confirms that the line-of-sight velocity dispersion of omega Cen remains approximately constant at ~6.5 kms-1 in the outer parts of the cluster, which contain only a small fraction of the total cluster stellar mass. It is argued that the approximately constant velocity dispersion in the outer regions is most likely a consequence of external influences, such as the tidal shock heating that occurs each time omega Cen crosses the Galactic plane. There is therefore no requirement to invoke dark matter or non-standard gravitational theories.
The Star Cluster Systems of the Magellanic Clouds
G. S. Da Costa
Physics , 2001,
Abstract: The characteristics of the cluster systems of the Magellanic Clouds, as inferred from integrated properties, are compared with those from individual cluster studies and from the field population. The agreement is generally satisfactory though in the case of the LMC, the lack of clusters older than ~3 Gyr is not reflected in the field population. The possible origin(s) for this cluster ``age-gap'' are discussed. The SMC cluster age-metallicity relation is also presented and discussed.
Are the globular clusters with significant internal [Fe/H] spreads all former dwarf galaxy nuclei?
G. S. Da Costa
Physics , 2015,
Abstract: In this contribution the hypothesis that the Galactic globular clusters with substantial internal [Fe/H] abundance ranges are the former nuclei of disrupted dwarf galaxies is discussed. Evidence considered includes the form of the metallicity distribution function, the occurrence of large diffuse outer envelopes in cluster density profiles, and the presence of ([s-process/Fe], [Fe/H]) correlations. The hypothesis is shown to be plausible but with the caveat that if significantly more than the current nine clusters known to have [Fe/H] spreads are found, then re-evaluation will be required.
The Ca II triplet in red giant spectra: [Fe/H] determinations and the role of [Ca/Fe]
G. S. Da Costa
Physics , 2015, DOI: 10.1093/mnras/stv2315
Abstract: Measurements are presented and analyzed of the strength of the Ca II triplet lines in red giants in Galactic globular and open clusters, and in a sample of red giants in the LMC disk that have significantly different [Ca/Fe] abundance ratios to the Galactic objects. The Galactic objects are used to generate a calibration between Ca II triplet line strength and [Fe/H], which is then used to estimate [Fe/H]_CaT for the LMC stars. The values are then compared with the [Fe/H]_spec determinations from high dispersion spectroscopy. After allowance for a small systematic offset the two abundance determinations are in excellent agreement. Further, as found in earlier studies, e.g., Battaglia et al. (2008), the difference is only a very weak function of the [Ca/Fe] ratio. For example, changing [Ca/Fe] from +0.3 to -0.2 causes the Ca II based abundance to underestimate [Fe/H]_spec by only ~0.15 dex, assuming a Galactic calibration. Consequently, the Ca II triplet approach to metallicity determinations can be used without significant bias to study stellar systems that have substantially different chemical evolution histories.
A o de extrato e óleo de nim no controle de Rhipicephalus (Boophilus) microplus (Canestrini, 1887) (Acari: Ixodidae) em laboratório Action of extract and oil neem in the control of Rhipicephalus (Boophilus) microplus (Canestrini, 1887) (Acari: Ixodidae) in laboratory
S?nia Maria Forti Broglio-Micheletti,Nivia da Silva Dias,Ellen Carine Neves Valente,Leilianne Alves de Souza
Revista Brasileira de Parasitologia Veterinária , 2010, DOI: 10.1590/s1984-29612010000100009
Abstract: Extratos vegetais organicos e óleos emulsionáveis de Azadirachta indica A. Juss (Meliaceae) (nim) foram estudados com o objetivo de avaliar seus efeitos no controle de fêmeas ingurgitadas de Rhipicephalus (Boophilus) microplus (Canestrini, 1887) em laboratório. Foram utilizados extratos organicos hexanicos e alcoólicos a 2% (peso/volume), em testes de imers o, durante 5 minutos, preparados com sementes, solubilizados em dimetilsulfóxido (DMSO) a 1%. O experimento foi inteiramente casualizado, sendo constituído por 6 tratamentos e 5 repeti es, cada uma delas representada por 5 carrapatos. O grupo controle consistiu de fêmeas sem tratamento. Com base nos resultados deste trabalho, pode-se indicar que os tratamentos extrato de semente (hexano) e óleo emulsionável I1, em concentra o a 2%, possuem significativo potencial adjuvante de controle do carrapato bovino, pois ocasionam a mortalidade nos primeiros dias após o tratamento e interferem na reprodu o, mostrando ser uma alternativa aos carrapaticidas normalmente utilizados. Organic plant extracts and emulsified oil of Azadirachta indica A. Juss (Meliaceae) (neem) were studied to evaluate its effects in control of engorged females of Rhipicephalus (Boophilus) microplus (Canestrini, 1887) in the laboratory. Hexane and alcoholic organic extracts, 2% (weight/volume) were used in tests of immersion for 5 minutes, prepared with seeds, solubilized in dimethylsulfoxide (DMSO) to 1%. The experiment was entirely randomized, consisting of 6 treatments and 5 replicates, each represented by 5 ticks. Control groups consisted of untreated females. Based on the results of this work, we can indicate that the seed extract (hexanic fraction) and óleo emulsionável I1 concentration to 2% have significant adjuvant potential to control the cattle tick, because, cause the mortality in the first days after the treatment and interfere in the reproduction, showing to be an alternative to acaricides normally used.
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