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Search Results: 1 - 10 of 9122 matches for " Felipe Antunes; "
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Felipe Lacerda Antunes
Revista Geográfica Acadêmica , 2007,
Abstract: Project Communication
Aspectos fenológicos de seis espécies vegetais em matas de galeria do Distrito Federal
Antunes, Neiva Beatriz;Ribeiro, José Felipe;
Pesquisa Agropecuária Brasileira , 1999, DOI: 10.1590/S0100-204X1999000900001
Abstract: the phenology of vochysia piramidalis, tapirira guianensis, talauma ovata, tococa formicaria, miconia pseudonervosa and miconia chamissois were observed weekly, from april/94 to september/95, on ten individuals of each specie. all species presented perennial leaves maybe due to soil water availability. according to the beginning of the rainy season, v. piramidalis and t. guianensis presented delayed flowering, t. ovata, t. formicaria and m. pseudonervosa precocious flowering, while m. chamissois was classified as late. miconia pseudonervosa and t. formicaria showed a long period of flowering and v. piramidalis, t. ovata, t. guianensis and m. chamissois a short one. vochysia piramidalis showed anemochorous dispersal pattern and all the other five species showed zoochorous. miconia pseudonervosa showed ripeness varying among and within plant. talauma ovata also showed a long period of immature fruits, but with simultaneous and quick ripening within the same tree. tapirira guianensis presented a large period of fruit production, simultaneous ripeness and short intervals between reproductive periods. tococa formicaria and m. chamissois showed a non-simultaneous short fruiting period within the same tree. in general, the zoocoricous species showed fruiting period within the rainy season, with corresponding animal dispersal period.
Ant?nio Carlos Antunes,Felipe Peixoto Dias
Revista PRETEXTO , 2000,
A Review of Telemetry Data Transmission in Unconventional Petroleum Environments Focused on Information Density and Reliability  [PDF]
Ivamberg Navarro de Almeida Jr., Pedro Duarte Antunes, Felipe Orlando Centeno Gonzalez, Roberto Akira Yamachita, Andreas Nascimento, Jose Luiz Goncalves
Journal of Software Engineering and Applications (JSEA) , 2015, DOI: 10.4236/jsea.2015.89043
Abstract: The paper addresses a literature review of the technologies used in the transmission of measuring and logging data during well drilling. It presents a discussion about efficiency in data density transmission and reliability, especially when it comes to software and automated tools. Initially, this paper analyzes the principle of the telemetry systems, considering the mud pulse telemetry, acoustic telemetry, electromagnetic telemetry and wired drill pipe telemetry. They were detailed highlighting information about functionality, data transmission and its linkage to supporting software. Focus is also given to details of the main advantages and disadvantages of each technology considering the influences of lithology, drilling fluid and formation fluids in the reliability and capacity of data transmission.
Determination of apramycin in oral soluble powder by a HPLC method using pre-column derivatization with o-phthalaldehyde and UV detection
Antunes, Elisabete de Almeida Barbosa;Louren?o, Felipe Rebello;Pinto, Terezinha de Jesus Andreoli;
Brazilian Journal of Pharmaceutical Sciences , 2011, DOI: 10.1590/S1984-82502011000200007
Abstract: a high-performance liquid chromatographic method employing pre-column derivatization with o-phthalaldehyde (opa) and 2-mercaptoacetic acid was developed for the determination of apramycin, an aminoglycoside antibiotic used in veterinary medicine, in the oral soluble powder form. the chromatographic separation was done by ion-pair hplc using a c18 reversed-phase column, synergy hydro (150 mm x 4.6 mm x 4 μm) and mobile phase composed of 0.005 mol/l sodium octanosulfonate in a mixture of acetonitrile: water: acetic acid (45:55:2) (v/v/v) with a flow rate of 1.0 ml/min; the uv detector was operated at 332 nm. the developed method was validated according to official compendia guidelines, having demonstrated robustness, selectivity and linearity for the concentration range of 0.02 to 0.05 mg/ml, precision (with rsd < 2.0% both for intra and inter-day precision) accuracy (average recuperation of 99.33%) and detectivity (quantification and detection limits of 0.08 and 0.02 μg/ml, respectively). three batches of commercial apramycin oral soluble powder were analyzed by both the proposed method and the official microbiological method, where all the results obtained were in the acceptable range (95% to 105% of labeled value of apramycin). both methods were statistically compared by the t test, which yielded no significant differences (α = 0.05) thereby confirming the equivalence of the methods.
Rice bran extract: an inexpensive nitrogen source for the production of 2G ethanol from sugarcane bagasse hydrolysate
Thais S. S. Milessi,Felipe A. F. Antunes,Anuj K. Chandel,Silvio S. Silva
3 Biotech , 2013, DOI: 10.1007/s13205-012-0098-9
Abstract: Selection of the raw material and its efficient utilization are the critical factors in economization of second generation (2G) ethanol production. Fermentation of the released sugars into ethanol by a suitable ethanol producing microorganism using cheap media ingredients is the cornerstone of the overall process. This study evaluated the potential of rice bran extract (RBE) as a cheap nitrogen source for the production of 2G ethanol by Scheffersomyces (Pichia) stipitis NRRL Y-7124 using sugarcane bagasse (SB) hemicellulosic hydrolysate. Dilute acid hydrolysis of SB showed 12.45 g/l of xylose and 0.67 g/l of glucose along with inhibitors. It was concentrated by vacuum evaporation and submitted to sequential detoxification (neutralization by calcium hydroxide and charcoal adsorption). The detoxified hydrolysate revealed the removal of furfural (81 %) and 5-hydroxymethylfurfural (61 %) leading to the final concentration of glucose (1.69 g/l) and xylose (33.03 g/l). S. stipitis was grown in three different fermentation media composed of detoxified hydrolysate as carbon source supplemented with varying nitrogen sources i.e. medium #1 (RBE + ammonium sulfate + calcium chloride), medium #2 (yeast extract + peptone) and medium #3 (yeast extract + peptone + malt extract). Medium #1 showed maximum ethanol production (8.6 g/l, yield 0.22 g/g) followed by medium #2 (8.1 g/l, yield 0.19 g/g) and medium #3 (7.4 g/l, yield 0.18 g/g).
Role of Organic Matter in the Adsorption/Desorption of Cr, Cu and Pb in Competitive Systems in Two Different Soils  [PDF]
Leandro Antunes Mendes, Luis Felipe Perez Bucater, Maria Diva Landgraf, Maria Olímpia Oliveira Rezende
Open Access Library Journal (OALib Journal) , 2014, DOI: 10.4236/oalib.1101022
Abstract: The various methods of remediation of contaminated soils include isolation, immobilization, toxicity reduction, physical separation and extraction. In this context, a noteworthy technique is vermicomposting, which uses worms to break down recent organic matter, turning it into a chemically more stable form able to retain metal ions, rendering them unavailable to the environment. To understand the transport of these elements in the soil, it is necessary to study their dynamics in the environment. Thus, the aim of this study was to evaluate the adsorption and desorption of metal species in soils, assessing the influence of added organic matter in order to assess the risk that these elements carry to the environment and human health. The curves of adsorption of three toxic elements in the soil were determined by adding a solution of metal salts at various concentrations, leaving 24 h centrifuging and analyzing the supernatant. The concentrations of adsorbed components were taken as the difference between those added initially and those remaining after the equilibration (Ce). Desorption was carried out by adding a solution of 0.01 mol·L﹣1 CaCl2·2H2O to soil samples where the metal ions were adsorbed. Following the same procedure, the concentrations of desorbed metal ions were measured.
In Vitro Effects of the Phytocomplex TrichoTechTM on Human Fibroblasts: Proliferative Potential and Effects on Gene Expression of FGF-7 and FGF-10  [PDF]
Fernando Amaral, Maira Jardim, Valeria Maria de Souza Antunes, Luis Felipe Gomes Michelin, Bárbara Anaís Rodrigues dos Santos, Christiano Marcelo Vaz Barbosa, Daniel Gonsales Spindola, Claudia Bincoletto, Carlos Rocha Oliveira
Journal of Cosmetics, Dermatological Sciences and Applications (JCDSA) , 2017, DOI: 10.4236/jcdsa.2017.71001
Abstract: The human hair follicle, a mini-organ formed with neuroectodermal-meso-dermal interaction, is a complex structure, in the active steady state (anagen) the dermal papilla can be considered as a ball of extracellular matrix, surrounding specialized fibroblasts. The cross-talk of dermal papilla with neighbouring matrix cells results in the maintenance of hair fibre production. This study aimed to investigate the proliferative potential of the compound TrichotechTM, a phytocomplex obtained from a mixture of essential oils, on cultured human fibroblasts and its ability to modulate the gene expression of FGF-7 and FGF-10. TrichotechTM was shown to enhance fibroblasts proliferation in concentrations of 0.5% to 2.0%, and also increase the percentage of cells in the S/G2/M phases of the cell cycle. TrichotechTM at both 1.0% and 2.0% induced a statistically significant effect on wound healing assay compared to the untreated control. We examined the interaction between cell survival (PI3K/Akt) and mitogenic (Ras/MAPK) signal transduction pathways after TrichotechTM treatment (1.0% and 2.0%) on the fibroblast cell line. TrichotechTM caused phosphorylation of ERK1/2, as well as greater phosphorylation of MEK in comparison with both the untreated control and ERK1/2. PI3K and AKT, however, were not shown to be significantly more phosphorylated following TrichotechTM exposure. To verify the relative expression of mRNA for FGF-7 and FGF-10 genes, a real-time polymerase chain reaction (qPCR) protocol was used. Results show the increase in mRNA expression by fibroblasts after treatment with TrichotechTM. In both concentrations tested, TrichotechTM was found to increase the expression of FGF-7 and FGF-10. Sirius red staining allows for rapid assessment of collagen content, it showed a significant increase in collagen content in treated fibroblasts. Further investigation concerning TrichotechTM could be helpful towards the development of new bioactive phytocomplexes for dermatological and trichological use.
Extended-spectrum beta-lactamase-producing bacteria isolated from hematologic patients in Manaus, State of Amazonas, Brazil
Ferreira, Cristina Motta;Ferreira, William Antunes;Almeida, Nayanne Cristina Oliveira da Silva;Naveca, Felipe Gomes;Barbosa, Maria das Gra?as Vale;
Brazilian Journal of Microbiology , 2011, DOI: 10.1590/S1517-83822011000300028
Abstract: antibiotic therapy in hematologic patients, often weak and susceptible to a wide range of infections, particularly nosocomial infections derived from long hospitalization periods, is a challenging issue. this paper presents esbl-producing strains isolated from such hematologic patients treated at the amazon hematology and hemotherapy foundation (hemoam) in the brazilian amazon region to identify the esbl genes carried by them as well as the susceptibility to 11 antimicrobial agents using the e-test method. a total of 146 clinical samples were obtained from july 2007 to august 2008, when 17 gram-negative strains were isolated in our institution. the most frequent isolates confirmed by biochemical tests and 16s rrna sequencing were e. coli (8/17), serratia spp. (3/17) and b.cepacia (2/17). all gram-negative strains were tested for extended-spectrum-beta-lactamases (esbls), where: (12/17) strains carried esbl; among these, (8/12) isolates carried blatem, blactx-m, blaoxa, blashv genes, (1/12) blatem gene and (3/12) blatem, blactx-m, blaoxa genes. antibiotic resistance was found in (15/17) of the isolates for tetracycline, (12/17) for ciprofloxacin, (1/17) resistance for cefoxitin and chloramphenicol, (1/17) for amikacin and (3/17) cefepime. this research showed the presence of gram-negative esbl-producing bacteria infecting hematologic patients in hemoam. these strains carried the blatem, blashv, blactx-m and blaoxa genes and were resistant to different antibiotics used in the treatment. this finding was based on a period of 13 months, during which clinical samples from specific populations were obtained. therefore, caution is required when generalizing the results that must be based on posological orientations and new breakpoints for disk diffusion and microdilution published by clsi 2010.
Cerebral trypanosomiasis and AIDS
Antunes Apio Claudio Martins,Cecchini Felipe Martins de Lima,Bolli Fernando von Bock,Oliveira Patricia Polanczyk de
Arquivos de Neuro-Psiquiatria , 2002,
Abstract: A 36 year-old black female, complaining of headache of one month's duration presented with nausea, vomiting, somnolence, short memory problems, loss of weight, and no fever history. Smoker, intravenous drugs abuser, promiscuous lifestyle. Physical examination: left homonimous hemianopsia, left hemiparesis, no papilledema, diffuse hyperreflexia, slowness of movements. Brain CT scan: tumor-like lesion in the splenium of the corpus calosum, measuring 3.5 x 1.4 cm, with heterogeneous enhancing pattern, sugesting a primary CNS tumor. Due to the possibility of CNS infection, a lumbar puncture disclosed an opening pressure of 380 mmH(2)0; 11 white cells (lymphocytes); glucose 18 mg/dl (serum glucose 73 mg/dl); proteins 139 mg/dl; presence of Trypanosoma parasites. Serum Elisa-HIV tests turned out to be positive. Treatment with benznidazole dramatically improved clinical and radiographic picture, but the patient died 6 weeks later because of respiratory failure. T. cruzi infection of the CNS is a rare disease, but we have an increasing number of cases in HIV immunecompromised patients. Diagnosis by direct observation of CSF is uncommon, and most of the cases are diagnosed by pathological examination. It is a highly lethal disease, even when properly diagnosed and treated. This article intends to include cerebral trypanosomiasis in the differential diagnosis of intracranial space-occupying lesions, especially in immunecompromised patients from endemic regions.
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