6 results on '"De Medeiros, J."'
Search Results
2. Auxiliary device for calibration of roller pumps: development and experimental results.
- Author
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Vieira, Fu, De Medeiros, J Dantas, Antunes, N, Vieira, Rw, and Costa, Et
- Subjects
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VASCULAR surgery , *ACADEMIC medical centers , *ANALYSIS of covariance , *BLOOD testing , *DRUG infusion pumps , *HEALTH outcome assessment , *REGRESSION analysis , *RESEARCH funding , *T-test (Statistics) , *EQUIPMENT & supplies , *TREATMENT effectiveness , *DESCRIPTIVE statistics ,RESEARCH evaluation - Abstract
The article discusses a study determining the efficacy of an auxiliary device for adjusting roller pumps using the dynamic calibration method and show preliminary results of its application in surgical procedures. The findings revealed that the auxiliary calibration device has shown calibration results statistically equal to those obtained with a reference device in the laboratory environment, and has less variability of hemolysis rates in the operating room.
- Published
- 2012
- Full Text
- View/download PDF
3. Atrazine and its degradation products in drinking water source and supply: Risk assessment for environmental and human health in Campinas, Brazil.
- Author
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De Caroli Vizioli B, Silva da Silva G, Ferreira de Medeiros J, and Montagner CC
- Subjects
- Humans, Chromatography, Liquid methods, Brazil, Tandem Mass Spectrometry methods, Environmental Monitoring, Atrazine analysis, Drinking Water analysis, Water Pollutants, Chemical analysis
- Abstract
Atrazine is a broad-spectrum herbicide widely used worldwide to control grassy and broadleaf weeds. Atrazine's popularity is attributable to its cost-effectiveness and reliable performance. Relatedly, it is also an important micropollutant with a potential negative impact on biodiversity and human health. Atrazine has long been regularly detected in several environmental compartments, and its widespread use has resulted in ubiquitous and unpreventable contamination. Among pesticides sold in Brazil, atrazine has remained among the top-ranked active ingredients for the last several years. Thus, this study aimed to evaluate the occurrence of atrazine and three degradation products (hydroxyatrazine, desisopropylatrazine, and desethylatrazine) in surface water (Capivari and Atibaia rivers) and treated water, monthly sampling from two drinking water treatment plants in Campinas (São Paulo, Brazil). An analytical method using solid-phase extraction (SPE) and liquid chromatography tandem mass spectrometry (LC-MS/MS) was developed to determine target compounds simultaneously. The method presented instrument quantification limits from 0.5 to 4.0 ng mL
-1 and recovery values from 80 to 112%, with a maximum relative standard deviation of 6%. All analytes had a detection frequency of 100% from 2 to 2744 ng L-1 . Statistical analysis showed no analyte removal after conventional water treatment. Also, the Capivari River showed greater analyte concentration than the Atibaia River. Performed risk assessments according to current Brazilian standards showed no human and environmental health risks. However, other risk assessment approaches may indicate potential risks, advocating for further research and ongoing surveillance., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier Ltd. All rights reserved.)- Published
- 2023
- Full Text
- View/download PDF
4. Chemical composition, nutritional properties, and antioxidant activity of Licania tomentosa (Benth.) fruit.
- Author
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Lima de Medeiros J, Silva de Almeida T, Joaquim Lopes Neto J, Carlos Pereira Almeida Filho L, Riceli Vasconcelos Ribeiro P, Sousa Brito E, Antonio Morgano M, Gomes da Silva M, Felipe Farias D, and Fontenele Urano Carvalho A
- Subjects
- Brazil, Chromatography, High Pressure Liquid, Chrysobalanaceae metabolism, Flavonoids chemistry, Flour analysis, Fruit chemistry, Fruit metabolism, Polyphenols analysis, Polyphenols chemistry, Protease Inhibitors analysis, Protease Inhibitors chemistry, Seeds chemistry, Seeds metabolism, Spectrometry, Mass, Electrospray Ionization, Antioxidants chemistry, Chrysobalanaceae chemistry, Nutritive Value, Plant Extracts chemistry
- Abstract
Licania tomentosa is a Brazilian plant species that produces edible fruits, yet there is little information available concerning their nutritional and/or bioactive composition. This study aimed to evaluate the nutritional and polyphenol composition of L. tomentosa fruits (pulp and seeds) and measure antioxidant activity in ethanolic extracts.The pulp and seeds were excellent sources of fiber (25.62%-41.70%) as well as minerals and vitamins. L. tomentosa contained no lectins or protease inhibitors (chymotrysin and trypsin) and 12 polyphenol compounds were identified in the seed extracts with a predominance of flavonoids. The seeds also presented antioxidant activities using the DPPH (SC
50 10.30-15.87 μg/mL), TBARS (IC50 18.46-20.84 μg/mL), and FRAP (RC50 0.203-0.309 μg/mL) assays. Due to its nutrient and antioxidant content, L. tomentosa may be used for food applications., (Copyright © 2019 Elsevier Ltd. All rights reserved.)- Published
- 2020
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5. Plasmodium vivax Malaria in Pregnant Women in the Brazilian Amazon and the Risk Factors Associated with Prematurity and Low Birth Weight: A Descriptive Study.
- Author
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Bôtto-Menezes C, Silva Dos Santos MC, Lopes Simplício J, Menezes de Medeiros J, Barroso Gomes KC, de Carvalho Costa IC, Batista-Silva E, Teixeira do Nascimento C, da Silva Chagas EC, Jardim Sardinha JF, Simões de Santana Filho F, Brock M, Bardají A, and Martínez-Espinosa FE
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- Adolescent, Adult, Birth Weight, Brazil epidemiology, Child, Female, Gestational Age, Humans, Infant, Newborn, Malaria, Vivax parasitology, Male, Middle Aged, Odds Ratio, Pregnancy, Risk Factors, Young Adult, Infant, Low Birth Weight, Infant, Premature, Malaria, Vivax epidemiology, Plasmodium vivax, Pregnancy Complications, Parasitic epidemiology
- Abstract
Introduction: Plasmodium vivax is the most prevalent malaria species in the American region. Brazil accounts for the higher number of the malaria cases reported in pregnant women in the Americas. This study aims to describe the characteristics of pregnant women with malaria in an endemic area of the Brazilian Amazon and the risk factors associated with prematurity and low birth weight (LBW)., Methods/principal Findings: Between December 2005 and March 2008, 503 pregnant women with malaria that attended a tertiary health centre were enrolled and followed up until delivery and reported a total of 1016 malaria episodes. More than half of study women (54%) were between 20-29 years old, and almost a third were adolescents. The prevalence of anaemia at enrolment was 59%. Most women (286/503) reported more than one malaria episode and most malaria episodes (84.5%, 846/1001) were due to P. vivax infection. Among women with only P. vivax malaria, the risk of preterm birth and low birth weight decreased in multigravidae (OR, 0.36 [95% CI, 0.16-0.82]; p = 0.015 and OR 0.24 [95% CI, 0.10-0.58]; p = 0.001, respectively). The risk of preterm birth decreased with higher maternal age (OR 0.43 [95% CI, 0.19-0.95]; p = 0.037) and among those women who reported higher antenatal care (ANC) attendance (OR, 0.32 [95% CI, 0.15-0.70]; p = 0.005)., Conclusion: This study shows that P. vivax is the prevailing species among pregnant women with malaria in the region and shows that vivax clinical malaria may represent harmful consequences for the health of the mother and their offsprings particularly on specific groups such as adolescents, primigravidae and those women with lower ANC attendance.
- Published
- 2015
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6. Temporal and physiological influence of the absorption of nutrients and toxic elements by Eichhornia crassipes.
- Author
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Martins DF, de Fátima Vitória de Moura M, Bezerra Loiola MI, Di Souza L, Barbosa E Silva KM, and Francismar de Medeiros J
- Subjects
- Absorption, Biomass, Brazil, Rivers, Seasons, Biodegradation, Environmental, Eichhornia metabolism, Metals metabolism, Nitrogen metabolism, Plant Proteins metabolism, Water Pollutants, Chemical metabolism
- Abstract
Aquatic macrophytes are a very important subject of study due to their capacity to restore polluted aquatic environments as they need high nutrient concentrations to develop. The present study aims to determine their temporal and physiological influence on the amount of total nitrogen, gross protein, P, Cu, Ni, Co, Cd, Pb and Cr absorbed by Eichhornia crassipes (water hyacinth) in the River Apodi/Mossoró, RN, Brazil, identifying viable possibilities for the use of cultivated biomass. Results obtained from the parameters analyzed show that these substances are impacted by the temporality and physiology of Eichhornia crassipes. Leaves showed higher crude protein and macronutrients, while the content of micronutrients and toxic elements was higher in roots. It could, therefore, be utilized to improve water quality in the River Apodi/Mossoró.
- Published
- 2011
- Full Text
- View/download PDF
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