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Search Results: 1 - 10 of 22516 matches for " Roberto;Romeiro "
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Bacterial spot and early blight biocontrol by epiphytic bacteria in tomato plants
Lanna Filho, Roberto;Romeiro, Reginaldo da Silva;Alves, Eduardo;
Pesquisa Agropecuária Brasileira , 2010, DOI: 10.1590/S0100-204X2010001200007
Abstract: the objective of this work was to evaluate in vitro and in vivo biocontrol of bacterial spot (xanthomonas vesicatoria) and early blight (alternaria solani) by the epiphytic bacteria paenibacillus macerans and bacillus pumilus. tomato plants were previously sprayed with epiphytic bacteria, benzalkonium chloride and pbs buffer and, after four days, they were inoculated with a. solani and x. vesicatoria. to determine the phytopathogenic bacteria population, leaflet samples were collected from each treatment every 24 hours, for seven days, and plated on semi-selective medium. the effect of epiphytic bacteria over phytopathogens was performed by the antibiosis test and antagonistic activity measured by inhibition zone diameter. the epiphytic and benzalkonium chloride drastically reduced the severity of early blight and bacterial spot in comparison to the control (pbs). in detached leaflets, the epiphytic bacteria reduced in 70% the number of phytopathogenic bacteria cells in the phylloplane. the antibiosis test showed that the epiphytic bacteria efficiently inhibit the phytopathogens growth. in all the bioassays, the epiphytic bacteria protect tomato plants against the phytopathogens
Carbon Capture and Storage and the UNFCCC: Recommendations to Address Trans-Boundary Issues  [PDF]
Viviane Romeiro, Virginia Parente
Low Carbon Economy (LCE) , 2012, DOI: 10.4236/lce.2012.323017
Abstract: This paper is mainly focused on the eligibility of trans-boundary Carbon Dioxide Capture and Storage (CCS) as a Clean Development Mechanism (CDM) project activity and it aims to explore a broad range of CCS transboundary issues whereby the United Nations Framework Convention on Climate Change (UNFCCC) and national governments could take into consideration. Much work is still to be done by the CCS community (including the Institute) to ensure that the implementation of CCS under the CDM is both environmentally effective and commercially attractive. The recommendations focus on technical issues, with the aim of helping Parties evaluate a robust strategy for CCS as part of international negotiations and establish CCS best practice criteria for governments and the international process, thereby enhancing transparency and ensuring that CCS deployment is safe and effective. When considering CDM projects activities with a transboundary component, it is recommend that the rules of the main international treaties related to CCS be considered by the UNFCCC, especially the London Protocol guidelines for risk assessment and management and the 2006 IPCC Guidelines. Additionally, national governments should apply the rules and guidelines as delineated under the relevant existing international treaties and CCS national regulations.
Self-performed supragingival biofilm control: qualitative analysis, scientific basis and oral-health implications
Cortelli, Sheila Cavalca;Cortelli, José Roberto;Aquino, Davi Romeiro;Costa, Fernando Oliveira;
Brazilian Oral Research , 2010, DOI: 10.1590/S1806-83242010000500008
Abstract: patients frequently fail to achieve an optimal mechanical plaque control. however, many patients are not confident about using mouthrinses, and many professionals refuse to prescribe them for regular daily use. aiming at achieving a better understanding of the use and prescription of mouthrinses in periodontics, 24 dentists with different dental educational levels were purposively chosen and interviewed in a qualitative research. partial data was presented at the 15th congress of the brazilian association for oral health promotion (aboprev), and full data was presented at the 88th general session and exhibition of the international association for dental research (iadr). the professionals' answers were confirmed or rejected through scientific data analysis. additionally, scientifically supported answers were provided for the interviewees' most frequent unanswered questions. around half of the participants (46%) reported that they recommended the use of mouthrinses, although a high percentage (64%) of the dentists answered that they knew very little about the efficacy of mouthrinses and also about the oral benefits (54%) provided by them. all interviewees reported that they were aware of the fact that their patients, and themselves, failed to floss and, less frequently, to brush their teeth, and all of them believed that oral health impacts overall systemic health. seventy five percent answered that using mouthrinses was safe. most participants (55%) did not declare themselves as mouthrinse users. we concluded that dentists with different levels of dental education have only partial knowledge related to mouthrinse use in periodontics. the use of effective mouthrinses on a daily basis is justified and can help patients achieve or maintain a healthier mouth. a healthier mouth will positively impact patients' quality of life and could also benefit their overall systemic health.
Tumorogênese em plantas causadas por espécies de Agrobacterium
Romeiro, Reginaldo da Silva;Vieira Júnior, José Roberto;Brommonschenkel, Sérgio Hermínio;
Summa Phytopathologica , 2007, DOI: 10.1590/S0100-54052007000100001
Abstract: tumors - the plant hyperplasia symptoms- - induced by species of agrobacterium sp. have deeply impressed plant pathologists since early 20th century when erwin smith and his co-workers demonstrated that such tumors had a bacterial etiology. nevertheless, until recently the state of art of microbiology and molecular biology was not developed enough for scientists to realize and to elucidate the complexes biochemical, genetic and physiologic mechanisms by which the pathogen transforms the plant by inserting a region of its own plasmid into the genome of the latter, creating an specific ecological niche for itself. in this paper its is showed a historical brief on the evolution of knowledge about the genomic characteristics of the ti plasmid, events and requirements needed for infection to take place as well as it is discussed the transformation dynamics of the host by the pathogen.
Characterization of Char and Oil From Low Temperature Conversion of Biomass from Eichhornia Crassipes
Roberto G. Pereira,Gilberto A. Romeiro,Raimundo N. Damasceno,Luiz Antonio P. Fernandes Junior
International Journal of Chemistry , 2011, DOI: 10.5539/ijc.v3n4p121
Abstract: The present work describes an experimental investigation concerning the characterization of char and oil obtained through Low Temperature Conversion (LTC) process applied to biomass of Eichhornia crassipes. Basic analysis (heating values, elemental analysis, total ash and moisture content) of char and oil are reported. The preliminary characteristics of the oil and the char obtained indicate the viability of their use as, for instance, in the generation of energy.
Validation of the anti-bacteremic efficacy of an essential oil rinse in a Brazilian population: a cross-over study
José Roberto Cortelli,Karina Cogo,Davi Romeiro Aquino,Sheila Cavalca Cortelli
Brazilian Oral Research , 2012,
Abstract: This cross-over study was conducted to assess the germ-killing efficacy of an essential oil mouthrinse (EOM) by determining the blood levels of microorganisms associated with induced bacteremia and investigating the prevalence of this event in Brazilians with mild-to-moderate gingivitis. Thirty four (31.19%) subjects positive for bacteremia induced by chewing a ration of apple were enrolled out of 109 screened subjects (50 males and 59 females). A difference of at least 10 colony forming units between the pre- and post-insult blood samples was defined as a positive result. For the following two weeks patients underwent a toothbrush plus fluoride dentifrice normalization period, and were then scheduled for the Phase I protocol as follows. At baseline I, subjects were instructed to chew a new apple ration, had new blood samples taken before and after this oral stimulus, and were randomly assigned to an experimental essential oil (n = 17) or placebo (P) mouthrinse (n = 17) treatment for 2 weeks. These procedures were repeated at the end of Phase I and then followed by a two-week wash-out period (tooth brushing with fluoride dentifrice). Bacteremia was again induced at baseline and at the end of Phase II, when subjects were crossed-over to the other EOM or placebo groups. Bacterial count differences between baseline and 2-week post-treatment (EOM versus P) in the blood samples collected were assessed by analysis of covariance. Mean aerobic counts decreased by 45.8%, whereas mean anaerobic counts decreased by 63.3% after EOM treatment. After the P treatment, aerobic bacteria increased by 28.4% and anaerobic bacteria decreased by 18.5%. This study validated this novel methodology and showed that the germ-killing action of EOM significantly reduced bacteremia.
A constru??o de um mito: Ant?nio de Albuquerque e o levante emboaba
Romeiro, Adriana;
Tempo , 2010, DOI: 10.1590/S1413-77042010000200007
Abstract: this article examines the construction of the image of peacemaker hero ant?nio de albuquerque, governor of the captaincy of rio de janeiro and then the captaincy of s?o paulo and minas do ouro, considered responsible for the pacification of the war of emboabas. described by cláudio manuel da costa as a hero endowed with virtues like courage and wisdom, such image would then spread to historical studies, influencing the narratives on the war of emboabas in particular, and the albuquerque administration in general.
Territórios de mando: banditismo em Minas Gerais, século XVIII
Adriana Romeiro
Varia Historia , 2007, DOI: 10.1590/s0104-87752007000100014
Absor??o de chumbo e potencial de fitorremedia??o de Canavalia ensiformes L.
Romeiro, Solange;Lag?a, Ana Maria Magalh?es Andrade;Furlani, Pedro Roberto;Abreu, Cleide Aparecida de;Pereira, Bruno Fernando Faria;
Bragantia , 2007, DOI: 10.1590/S0006-87052007000200017
Abstract: phytoextraction is an important technique used for decontamination of areas polluted by heavy metals. consequently, understanding the physiological responses in relation to the tolerance of tropical species subjected to increasing levels of contamination is fundamental before considering their use as phytoextractans in contaminated areas. the objective of our study was to assess the potential of canavalia ensiformes l. for the phytoextraction of lead (pb). plants were cultivated with nutrient solution in greenhouse under partially controlled conditions. pb was tested at concentrations of 100, 200 and 400 μmol.l-1. the experimental set-up was a randomized blocks design, using a 4 x 1 factorial scheme, with three replicates. follow-ups of physiological symptoms were carried out, determining fresh and dried mass for shoot and root, leaf area, plant height, pb content in nutrient solution and in roots and shoot of the plants. the samples of shoot and roots and of the nutrient solution were submitted to chemical analysis for the determination of pb, using dry digestion. the canavalia ensiformes plants proved to be both accumulators and tolerant to pb, demonstrating their potential as a phytoextractants.
Periodontal profile and presence of periodontal pathogens in young African-Americans from Salvador, BA, Brazil
Victor, Ligia Valéria;Cortelli, Sheila Cavalca;Aquino, Davi Romeiro;Carvalho Filho, Jonas de;Cortelli, José Roberto;
Brazilian Journal of Microbiology , 2008, DOI: 10.1590/S1517-83822008000200005
Abstract: this cross-sectional study evaluated the periodontal status and the presence of periodontopathogens in 132 young, black ethnic subjects who live in salvador/bahia-brazil and have never smoked. periodontal probing depth (ppd), clinical attachment level (cal), plaque index (pi) and gingival index (gi) were measured and analyzed by anova and wilcoxon tests (p<0.05) according to gender and age. the presence of a.actinomycetemcomitans, p.gingivalis, e.corrodens and f.nucleatum was determined by pcr and was analyzed by anova, wilcoxon, student-t tests (p<0.05). mean values of ppd and cal were 2.18 and 1.0mm, respectively. clinical parameters did not show differences between subjects of varying gender and age. the microbial prevalence was observed to be 95.45% for e.corrodens followed by f.nucleatum with 68.18%, a.actinomycetemcomitans with45.45% and p.gingivalis with 40.9%. an association between the presence of pathogens and gender and age was not observed (p<0.05). ppd, cal and pi were not associated with p.gingivalis; however, gi appeared in higher frequencies among subjects without p.gingivalis. in this young, black ethnic, brazilian population, a high percentage (96.96%) of subjects harbored at least one selected periodontal pathogen, but most subjects showed a healthy periodontal status. further investigations are required to evaluate the actual influence of the presence of these bacterial species.
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