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Search Results: 1 - 10 of 252978 matches for " Daniel C. Leite "
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Resíduos de calda sulfocálcica sobre a eficiência de acaricidas no controle de Brevipalpus phoenicis
Andrade, Daniel Junior de;Pattaro, Fernando César;Oliveira, Carlos Amadeu Leite de;
Ciência Rural , 2011, DOI: 10.1590/S0103-84782011005000129
Abstract: the objective was to assess the influence of lime sulfur residues on the acaricidal efficiency against brevipalpus phoenicis mite. initially, the experiment was conducted in a citrus orchard where 10 plants presenting scab fruits were selected. secondly, the application of lime sulfur (8mg a.i. l-1 of water) was performed in five plants, and the other five plants remained without application. next lime sulfur application, 64 fruits in the plants with lime sulfur application were protected with plastic cups and others 64 fruits also were protected in the plants without lime sulfur application with plastic cups. after 30 days of field application, fruits were harvested and transported to the laboratory. these fruits were partially waxed, leaving an arena of approximately 2.5cm in diameter with scab and without paraffin and entrapped with entomological glue. afterwards, acaricides application were done following the concentration expressed in mg of active ingredient per liter of water: propargite (720mg), fenbutatin oxide (400mg), cyhexatin (250mg), azocyclotin (250mg), fenpyroximate (50mg), dicofol (960mg), dinocap (738mg) and control treatment by using the petri dish-potter tower method. after 1, 7 and 16 days of application, ten b. phoenicis were transferred per fruit, in order to evaluate their mortality, 24 and 48 hours after the transferences. the lime sulfur residue did not affect the acaricides efficiency.
Lack of parthenogenesis by Amblyomma cajennense (Acari: Ixodidae)
Freitas Carolina MV de,Leite Romário C,Lopes Cristina ML,Rodrigues Daniel S
Memórias do Instituto Oswaldo Cruz , 2002,
Abstract: Some reproductive parameters of adult stages of Amblyomma cajennense ticks were studied. The capacity of virgin females to reproduce by parthenogenesis was evaluated, during an experimental infestation, in absence of males, on a horse (Equus cabalus). Ticks were spread either completely free or in limited sites on the body of the animal. The engorged virgin females showed longer feeding periods and lighter body weights than those that had been fertilized. Some of these unmated females produced smaller egg masses, which had no embryonary development. On the other hand, females that had been inseminated produced larger egg masses, with normal embryonary development that led to viable larvae. Under the studied conditions, A. cajennense females did not reproduce by parthenogenesis.
Dissec??o espontanea de artéria carótida interna com paralisia de nervos cranianos inferiores: relato de caso
Vieira, Vera L.F.;Pereira, Daniel C.;Ribeiro, Vinícius T.;Leite, Alex B.C.;Emerique, Iran;
Arquivos de Neuro-Psiquiatria , 2006, DOI: 10.1590/S0004-282X2006000600035
Abstract: spontaneous internal carotid artery dissection is a rare event that strikes patients at their productive age. as early intervention frequently determines a significant improvement, it is important to broaden the knowledge of the clinical, pathogenic and pathophysiological aspects of this disease. the objective is making an early diagnosis and treatment to avoid a bad outcome. we report the case of a 46 years-old man with spontaneous carotid artery dissection that had an atypical manifestation characterized by sudden paralysis of lower cranial nerves.
Acaricidas utilizados na citricultura convencional e organica: manejo da leprose e popula??es de ácaros fitoseídeos
Andrade, Daniel Júnior de;Oliveira, Carlos Amadeu Leite de;Pattaro, Fernando César;Siqueira, Diego Silva;
Revista Brasileira de Fruticultura , 2010, DOI: 10.1590/S0100-29452011005000013
Abstract: the citrus leprosis control in s?o paulo state is performed exclusively by acaricides to control the vector mite, brevipalpus phoenicis, which increases the production costs and may affect the beneficial organism's population. therefore, the aim of this trial was to evaluate during four seasons, the effects of acaricides recommended to control the mite b. phoenicis in conventional and organic citrus over evolution of citrus leprosis and over phytoseiids' population. the experiment was installed in october of 2003 in a citrus orchard in reginópolis city, state of s?o paulo. the experimental design used randomized blocks, the dosages was expressed as ml c.p./ 100 l of water and the treatments were the following: spirodiclofen (20 ml); cyhexatin (50 ml) (used in rotation), lime sulfur (4,000 ml) and control (without pesticide application). however, the rotation between spirodiclofen and cyhexatin began in september 2006. prior to that time, only spirodiclofen had been used. surveys were conducted every 15 days on the b. phoenicis, iphiseioides zuluagai,and euseius populations. the control level adopted by the b. phoenicis was 8.3%, and the pesticide applications were conducted using tractor-sprayers. during the 2007-08 seasons, 10 infected fallen fruits per plot were collected and the number of leprosis lesions was quantified by each fruit. by the end of the 2007-08 seasons, the productivity, harvest losses, the disease incidence and severity were evaluated. it was found that the lesions' location over the fruit is more important in determining its drop than the lesions' number. the more intense the mite infestation, the greater is the number of lesions, resulting in increased premature fruit drop. a strategy using acaricides spirodiclofen and cyhexatin in rotation promoted more efficient control of b. phoenicis compared to lime sulfur, resulting in greater productivity, lower fruit losses and severity levels. the lime sulfur applications reduced the mite population in
Lack of parthenogenesis by Amblyomma cajennense (Acari: Ixodidae)
Freitas, Carolina MV de;Leite, Romário C;Lopes, Cristina ML;Rodrigues, Daniel S;Paz, Gustavo Fontes;Oliveira, Paulo R de;
Memórias do Instituto Oswaldo Cruz , 2002, DOI: 10.1590/S0074-02762002000600016
Abstract: some reproductive parameters of adult stages of amblyomma cajennense ticks were studied. the capacity of virgin females to reproduce by parthenogenesis was evaluated, during an experimental infestation, in absence of males, on a horse (equus cabalus). ticks were spread either completely free or in limited sites on the body of the animal. the engorged virgin females showed longer feeding periods and lighter body weights than those that had been fertilized. some of these unmated females produced smaller egg masses, which had no embryonary development. on the other hand, females that had been inseminated produced larger egg masses, with normal embryonary development that led to viable larvae. under the studied conditions, a. cajennense females did not reproduce by parthenogenesis.
Reuse of untreated irrigation water as a vehicle of inoculum of pathogens in eucalyptus clonal nursery
Mafia, Reginaldo G.;Alfenas, Acelino C.;Ferreira, Eraclides M.;Machado, Patrícia S.;Binoti, Daniel H.B.;Leite, Fernando P.;Souza, Flávio L.;
Tropical Plant Pathology , 2008, DOI: 10.1590/S1982-56762008000200003
Abstract: the risk posed by reuse of untreated water for irrigation, collected from the effluents of mini-hedges, greenhouses, shade houses, growing and hardening areas of a eucalyptus cutting nursery, was evaluated in relation to the dissemination of botrytis cinerea and cylindrocladium candelabrum. the presence of inocula of these fungi was also evaluated on gravel used as soil cover. for pathogen detection, leaf discs of castor bean (ricinus communis) were employed as biological bait. periodical analyses of water samples, collected in the nursery effluents, and of gravel, showed that both pathogens are frequently disseminated in the water of the effluents and the gravel used as soil cover, although c. candelabrum is most common. the composition and salt concentration of three nutrient solutions, expressed in electric conductivity values (0, 0.5, 1.0, 1.5, 2.0, 2.5 and 3.0 ms.cm-1) did not affect conidial germination of these two fungi.
Periodic Bifurcations in Descendant Trees of Finite p-Groups  [PDF]
Daniel C. Mayer
Advances in Pure Mathematics (APM) , 2015, DOI: 10.4236/apm.2015.54020
Abstract: Theoretical background and an implementation of the p-group generation algorithm by Newman and O’Brien are used to provide computational evidence of a new type of periodically repeating patterns in pruned descendant trees of finite p-groups.
Index-p Abelianization Data of p-Class Tower Groups  [PDF]
Daniel C. Mayer
Advances in Pure Mathematics (APM) , 2015, DOI: 10.4236/apm.2015.55029
Abstract:

Given a fixed prime number p, the multiplet of abelian type invariants of the p-class groups of all unramified cyclic degree p extensions of a number field K is called its IPAD (index-p abeliani- zation data). These invariants have proved to be a valuable information for determining the Galois group \"\" of the second Hilbert p-class field and the p-capitulation type of K. For p=3 and a number field K with elementary p-class group of rank two, all possible IPADs are given in the complete form of several infinite sequences.

Periodic Sequences of p-Class Tower Groups  [PDF]
Daniel C. Mayer
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.37090
Abstract:

Recent examples of periodic bifurcations in descendant trees of finite p-groups with \"\" ?are used to show that the possible p-class tower groups G of certain multiquadratic fields K with p- class group of type (2,2,2), resp. (3,3), form periodic sequences in the descendant tree of the elementary Abelian root \"\"

Artin Transfer Patterns on Descendant Trees of Finite p-Groups  [PDF]
Daniel C. Mayer
Advances in Pure Mathematics (APM) , 2016, DOI: 10.4236/apm.2016.62008
Abstract: Based on a thorough theory of the Artin transfer homomorphism \"\" from a group G to the abelianization \"\" of a subgroup \"\" of finite index \"\" , and its connection with the permutation representation \"\" and the monomial representation \"\" of G, the Artin pattern \"\", which consists of families \"\" , resp. \"\" , of transfer targets, resp. transfer kernels, is defined for the vertices \"\" of any descendant tree T of finite p-groups. It is endowed with partial order relations \"\" and \"\", which are compatible with the parent-descendant relation \"\" of the edges \"\" of the tree ?T. The partial order enables termination criteria for the p-group generation algorithm which can be used for searching and identifying a finite p-group G, whose Artin pattern \"\" is known completely or at least partially, by constructing the descendant tree with the abelianization \"\" of G as its root. An appendix summarizes details concerning induced homomorphisms between quotient groups, which play a crucial role in establishing the natural partial order on Artin patterns \"\" and explaining the stabilization, resp. polarization, of their components in descendant trees T of finite p-groups.
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