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Cavalcante IR, Luz JAM, Santos CID, Linhares LA, Lopes GS, Cavaleiro KCLM, Braga ML, Silva ECE. ATENÇÃO AMBULATORIAL ESPECIALIZADA EM HEMATOLOGIA E HEMOTERAPIA NA CLÍNICA DE SAÚDE DO INSTITUTO PRÓ-HEMO SAÚDE (IPH). Hematol Transfus Cell Ther 2022. [DOI: 10.1016/j.htct.2022.09.772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Alcântara DB, Riceli P, Almeida ADS, Luz LR, Nascimento HO, Fernandes TSM, Dionísio AP, Castro ACR, Nascimento RF, Lopes GS, Zocolo GJ. Development, Optimization, and Validation of an Ultrasound-Assisted Liquid–Liquid Microextraction (UALLME) for Selenomethionine Analyses in Cashew Nut (Anacardium occidentale) by Ultra-Performance Liquid Chromatography Coupled to Electrospray Ionization/Single Quadrupole Mass Spectrometer (UPLC-ESI/QDa). FOOD ANAL METHOD 2022. [DOI: 10.1007/s12161-022-02355-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Alcântara DB, Dionísio AP, Artur AG, Silveira BKS, Lopes AF, Guedes JAC, Luz LR, Nascimento RF, Lopes GS, Hermsdorff HHM, Zocolo GJ. Selenium in Brazil nuts: An overview of agronomical aspects, recent trends in analytical chemistry, and health outcomes. Food Chem 2022; 372:131207. [PMID: 34634585 DOI: 10.1016/j.foodchem.2021.131207] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 08/30/2021] [Accepted: 09/20/2021] [Indexed: 01/15/2023]
Abstract
Se is an essential element in mammals. We review how its bioavailability in soil and the ability of plants to accumulate Se in foods depends on the soil Se profile (including levels and formats), besides to describe how the various selenoproteins have important biochemical functions in the body and directly impact human health. Owing to its favorable characteristics, the scientific community has investigated selenomethionine in most nut matrices. Among nuts, Brazil nuts have been highlighted as one of the richest sources of bioavailable Se. We summarize the most commonly used analytical methods for Se species and total Se determination in nuts. We also discuss the chemical forms of Se metabolized by mammals, human biochemistry and health outcomes from daily dietary intake of Se from Brazil nuts. These findings may facilitate the understanding of the importance of adequate dietary Se intake and enable researchers to define methods to determine Se species.
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Silva NA, Nobre NF, Lopes GS. Rapid and Low Cost Determination of Total Mercury in Cat Foods by Photochemical Vapor Generation Coupled to Atomic Absorption Spectrometry. Biol Trace Elem Res 2021; 199:1161-1169. [PMID: 32472353 DOI: 10.1007/s12011-020-02216-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Accepted: 05/20/2020] [Indexed: 10/24/2022]
Abstract
A rapid and low-cost method for determination of total mercury (THg) in cat food was developed based on photochemical vapor generation (PVG) coupled to cold vapor atomic absorption spectrometry (CVAAS). Cat food samples with ingredients based on tuna fish and other seafood were investigated. Organic acid precursor and concentration for radical generation and Hg photoreduction, sample UV irradiation time, and carrier gas flow were optimized. Highest PVG efficiency was achieved using 10% v v-1 formic acid, 4-s UV irradiation time, and a carrier gas flow of 50 mL min-1. The calibration function presented a correlation coefficient of 0.99. Accuracy was confirmed by analysis of Certified Reference Materials with recoveries of 93-110% and relative standard deviation lower than 6%. Under optimized conditions, a procedural detection limit of 0.28 μg kg-1 was obtained. Determination of THg in 10 samples of cat food purchased in local markets revealed a concentration range of 0.035-0.388 mg kg-1. Highest concentrations were found in cat foods. Only one sample presented a concentration close to the regulatory limit of the European Commission Directive. Assuming the estimated daily food intake (EDI) calculated in a range of 0.0021 to 0.023 mg of THg per day per kg body weight, it is concluded that it remains below that considered lethal for cats. The methodology is efficient, simple, low cost, and fit for purpose.
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Vasconcelos PHM, Camelo ALM, de Lima ACA, do Nascimento HO, Vidal CB, do Nascimento RF, Lopes GS, Longhinotti E. Chemometric tools applied to optimize a fast solid-phase microextraction method for analysis of polycyclic aromatic hydrocarbons in produced water. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:8012-8021. [PMID: 33044696 DOI: 10.1007/s11356-020-10881-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Accepted: 09/15/2020] [Indexed: 06/11/2023]
Abstract
Chemometric tools are powerful strategies to efficiently optimize many processes. These tools were employed to optimize a fast-solid phase microextraction procedure, which was used for the analysis of polycyclic aromatic hydrocarbons (PAHs) in oil-based produced water using a Headspace-Solid Phase Microextraction technique (HS-SPME/GC-MS). This optimization was achieved with a 24 factorial design approach, where the final conditions for this extraction procedure were 10 μg L-1, 1 h, 92 °C (at headspace), and 0.62 mol L-1 for PAHs concentration, fiber exposition to headspace, temperature, and NaCl concentration, respectively. The limit of detection (LOD) in this protocol ranged from 0.2 to 41.4 ng L-1, while recovery values from 67.65 to 113.10%. Besides that, relative standard deviation (RSD) were lower than 8.39% considering high molecular weight compounds. Moreover, the proposed methodology in this work does not require any previous treatment of the sample and allows to quantify a higher number of PAHs. Notably, naphthalene was the major PAHs compound quantified in all samples of the produced water at 99.99 μg L-1. Altogether, these results supported this methodology as a suitable analytical strategy for fast determination of PAHs in produced water from oil-based industry.
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da Silva FLF, Neto DMA, de Menezes FL, Sa IP, de Higuera JM, Fechine PBA, da Costa LS, Nogueira ARA, Lopes GS, Matos WO. Non-chromatographic arsenic speciation analyses in wild shrimp (Farfantepenaeus brasiliensis) using functionalized magnetic iron-nanoparticles. Food Chem 2020; 345:128781. [PMID: 33601653 DOI: 10.1016/j.foodchem.2020.128781] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 11/11/2020] [Accepted: 11/29/2020] [Indexed: 11/26/2022]
Abstract
A new iron-magnetic nanomaterial functionalized with organophosphorus compound was used as solid-phase for arsenic speciation analysis in seafood samples by ICP-MS. The procedure was optimized using chemometric tools and the variables pH = 4.0, 15 min extraction time, and 20 mg of mass of material were obtained as the optimum point. The inorganic arsenic (iAs) extracted using nanoparticles presented concentrations between 20 and 100 µg kg-1 in the evaluated samples. The method was validated for accuracy using CRMs DOLT-5 and DORM-4. It was possible to reuse the same magnetic nanomaterial for 6 successive cycles, and we obtained a detection limit of 16.4 ng kg-1. The proposed method is suitable for the use of inorganic speciation of As, presenting good accuracy, precision, relatively low cost, and acquittance to green chemistry principles.
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Alcântara DB, Nascimento RF, Lopes GS, Grinberg P. Evaluation of different strategies for determination of selenomethionine (SeMet) in selenized yeast by asymmetrical flow field flow fractionation coupled to inductively coupled plasma mass spectrometry (AF4-ICP-MS). ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2020; 12:3351-3360. [PMID: 32930222 DOI: 10.1039/d0ay00658k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
This manuscript exemplifies the prospective use of asymmetrical flow field flow fractionation (AF4) coupled to inductively coupled plasma mass spectrometry (ICP-MS) as a simple tool for chemical speciation of selenomethionine (SeMet) in selenized yeast. Several popular sample preparation methods were evaluated for their suitability to determine selenomethionine (SeMet) in selenized yeast by AF4-ICP-MS. These included water, methanesulfonic acid (MSA), formic acid (FA) and alkaline extractions. Alkaline extraction (using sodium dodecyl sulfate buffer) provided the best recovery/determination conditions for SeMet based on analysis of NRC certified reference material (CRM) SELM-1 since it minimized hydrolysis of the protein peptide bonds optimally required for the AF4 separation. The analytical performance of three different AF4 membranes (5, 10 and 500 kDa regenerated cellulose) was also evaluated. No significant difference in the recovery of SeMet was observed when using 5 and 10 kDa RC membranes, whereas the 500 kDa membrane resulted in a significant loss. The proposed method presents appropriate instrument and intra-assay precisions of 4.4-9.2% and 3.8% RSD, respectively, a detection limit of 0.49 μg L-1 SeMet as Se and good linearity with correlation coefficients (R) between 0.996 - 0.999. This is the first report of use of AF4-ICP-MS for species specific quantitation of SeMet in selenized yeast demonstrating its efficient use as an alternative method to other traditional chromatographic techniques.
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Silva FLF, Nascimento GO, Lopes GS, Matos WO, Cunha RL, Malta MR, Liska GR, Owen RW, Trevisan MTS. The concentration of polyphenolic compounds and trace elements in the Coffea arabica leaves: Potential chemometric pattern recognition of coffee leaf rust resistance. Food Res Int 2020; 134:109221. [PMID: 32517933 DOI: 10.1016/j.foodres.2020.109221] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 04/02/2020] [Accepted: 04/06/2020] [Indexed: 01/03/2023]
Abstract
Coffee (Coffea arabica L.) is an important commodity, involving about 500 million people from the cultivation of the coffee trees to final consumption of infusions of the ground roasted coffee beans. In contrast to a considerable amount of research performed on green coffee beans, there are relatively few studies regarding the chemical constituents of coffee leaves. Hemileia vastatrix is a parasite, specific to coffee plants and causes coffee leaf rust, which is a very destructive disease. Some coffee plants have natural resistance which is mainly linked to a gene and specific host resistance response. An increase in flavonoid production may be related to fungal disease resistance, with the levels and flavonoid types being an early physiological response to rust infection. Trace inorganic elements can be related to many roles in the defense response of higher plants and can be used as a biomarker for some diseases. To address this, coffee leaves from 16 different cultivars of Coffea arabica were harvested from Minas Gerais, Brazil (susceptible and resistant to rust) and their polyphenolic compounds were extracted using the QuEChERS technique and quantitated by HPLC-ESI-MS. The same leaves were decomposed using an acid mixture in a block digester and the content of Al, Cu, Mg, Mn, Ni, Sn and Zn was quantitated by ICP-OES. Principal component analysis (PCA) was applied and we could establish a relation between polyphenolic and trace element concentration in the leaves with resistance to rust infection. On this basis in this preliminary study we were able to separate the resistant from the susceptible cultivars. The main compounds responsible for this differentiation were the content of chlorogenic acid and magnesium in the leaves. The content of polyphenolic compounds was lower in susceptible cultivars and a diametric effect was observed between Mn and Mg concentrations. This study shows potential for the discrimination of resistant and susceptible coffee trees based on the analyses of both trace element and polyphenolic concentration.
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Campos VM, Silva FLF, Oliveira JPS, Ribeiro LPD, Matos WO, Lopes GS. Investigation of a rapid infrared heating assisted mineralization of soybean matrices for trace element analysis. Food Chem 2019; 280:96-102. [PMID: 30642512 DOI: 10.1016/j.foodchem.2018.12.051] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Revised: 11/01/2018] [Accepted: 12/09/2018] [Indexed: 10/27/2022]
Abstract
A fast sample preparation procedure based on use of infrared (IR) assisted heating for mineralization of soybean derived samples has been developed for their subsequent multielement analysis by inductively coupled plasma optical emission spectrometry (ICP-OES) and flame atomic absorption spectrometry (FAAS). A cold finger was examined for refluxing of acid vapors to determine its impact on efficiency and economy of digestion. The optimized procedure, based on 1 g subsamples, 8 mL of HNO3 (65% w/w) and exposure of the mixture to a 500 W IR source for 5 min without refluxing, permitted accurate determination of all analytes in NIST SRM 1568b (rice flour). Detection limits using ICP-OES were (µg/kg) 97, 1.0, 39, 185, 0.47 and 1200 for Ca, Cu, Fe, K, Mn and P, respectively, and 18 for Zn by FAAS. The IR-assisted digestion approach provided a low cost, easy to use system having great potential for implementation in routine analysis of trace elements in soybean and similar matrices.
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da Silva FL, de Lima JP, Melo LS, da Silva YS, Gouveia ST, Lopes GS, Matos WO. Comparison between boiling and vacuum cooking ( sous-vide ) in the bioaccessibility of minerals in bovine liver samples. Food Res Int 2017; 100:566-571. [DOI: 10.1016/j.foodres.2017.07.054] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Revised: 07/19/2017] [Accepted: 07/22/2017] [Indexed: 12/12/2022]
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Gondim TA, Guedes JAC, Ribeiro LPD, Lopes GS, Matos WO. Optimization of a cloud point extraction procedure with response surface methodology for the quantification of dissolved iron in produced water from the petroleum industry using FAAS. MARINE POLLUTION BULLETIN 2017; 114:786-791. [PMID: 27837910 DOI: 10.1016/j.marpolbul.2016.10.068] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Revised: 10/19/2016] [Accepted: 10/31/2016] [Indexed: 06/06/2023]
Abstract
The characterization of inorganic elements in the produced water (PW) samples is a difficult task because of the complexity of the matrix. This work deals with a study of a methodology for dissolved Fe quantification in PW from oil industry by flame atomic absorption spectrometry (FAAS) after cloud point extraction (CPE). The procedure is based on the CPE using PAN as complexing agent and Triton X-114 as surfactant. The best conditions for Fe extraction parameters were studied using a Box-Behnken design. The proposed method presented a LOQ of 0.010μgmL-1 and LOD of 0.003μgmL-1. The precision of the method was evaluated in terms of repeatability, obtaining a coefficient of variation of 2.54%. The accuracy of the method was assessed by recovery experiments of Fe spiked that presented recovery of 103.28%. The method was applied with satisfactory performance to determine Fe by FAAS in PW samples.
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Lopes GS, Silva FLF, Grinberg P, Sturgeon RE. An Evaluation of the Use of Formic Acid for Extraction of Trace Elements from Brazil Nut and Babassu Coconut and Its Suitability for Multi-Element Determination by ICP-MS. J BRAZIL CHEM SOC 2016. [DOI: 10.5935/0103-5053.20160018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Lico DTP, Lopes GS, Brusco J, Rosa JC, Gould RM, De Giorgis JA, Larson RE. A novel SDS-stable dimer of a heterogeneous nuclear ribonucleoprotein at presynaptic terminals of squid neurons. Neuroscience 2015; 300:381-92. [PMID: 26012490 DOI: 10.1016/j.neuroscience.2015.05.040] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Revised: 05/05/2015] [Accepted: 05/16/2015] [Indexed: 01/27/2023]
Abstract
The presence of mRNAs in synaptic terminals and their regulated translation are important factors in neuronal communication and plasticity. Heterogeneous nuclear ribonucleoprotein (hnRNP) complexes are involved in the translocation, stability, and subcellular localization of mRNA and the regulation of its translation. Defects in these processes and mutations in components of the hnRNP complexes have been related to the formation of cytoplasmic inclusion bodies and neurodegenerative diseases. Despite much data on mRNA localization and evidence for protein synthesis, as well as the presence of translation machinery, in axons and presynaptic terminals, the identity of RNA-binding proteins involved in RNA transport and function in presynaptic regions is lacking. We previously characterized a strongly basic RNA-binding protein (p65), member of the hnRNPA/B subfamily, in squid presynaptic terminals. Intriguingly, in sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE), p65 migrated as a 65-kDa protein, whereas members of the hnRNPA/B family typically have molecular masses ranging from 35 to 42kDa. In this report we present further biochemical and molecular characterization that shows endogenous p65 to be an SDS-stable dimer composed of ∼37-kDa hnRNPA/B-like subunits. We cloned and expressed a recombinant protein corresponding to squid hnRNPA/B-like protein and showed its propensity to aggregate and form SDS-stable dimers in vitro. Our data suggest that this unique hnRNPA/B-like protein co-localizes with synaptic vesicle protein 2 and RNA-binding protein ELAV and thus may serve as a link between local mRNA processing and presynaptic function and regulation.
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Silva FLFD, Duarte TOA, Dantas ANS, Lopes GS, Gouveia ST, Matos WO. TREATMENT OF WASTE FROM ATOMIC EMISSION SPECTROMETRIC TECHNIQUES AND REUSE IN UNDERGRADUATE LAB CLASSES FOR QUALITATIVE ANALYSIS. QUIM NOVA 2015. [DOI: 10.5935/0100-4042.20150142] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Ureshino RP, Bertoncini CR, Fernandes MJS, Abdalla FMF, Porto CS, Hsu YT, Lopes GS, Smaili SS. Alterations in calcium signaling and a decrease in Bcl-2 expression: possible correlation with apoptosis in aged striatum. J Neurosci Res 2010; 88:438-47. [PMID: 19774672 DOI: 10.1002/jnr.22214] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Aging is a multifaceted process associated with various functional and structural deficits that might be evolved in degenerative diseases. It has been shown that neurodegenerative disorders are associated with alterations in Ca(2+) homeostasis. Thus, in the present work, we have investigated Ca(2+) signaling and apoptosis in aged striatum. Our results show that glutamate and NMDA evoke a greater Ca(2+) rise in striatum slices from aged animals. However, this difference is not present when glutamate is tested in the absence of external Ca(2+). Immunostaining of glutamate receptors shows that only NMDA receptors (NR1) are increased in the striatum of aged rats. Increases in mitochondrial Ca(2+) content and in the reactive oxygen species levels were also observed in aged animals, which could be associated with tissue vulnerability. In addition, a decrease in the Bcl-2 protein expression and an enhancement in apoptosis were also present in aged striatum. Together the results indicate that, in aged animals, alterations in Ca(2+) handling coupled to an increase in ROS accumulation and a decrease in the prosurvival protein Bcl-2 may contribute to apoptosis induction and cell death in rat striatum.
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Damasco PV, Pimenta FP, Filardy AA, Brito SM, Andrade AFB, Lopes GS, Hirata R, Mattos-Guaraldi AL. Prevalence of IgG diphtheria antitoxin in blood donors in Rio de Janeiro. Epidemiol Infect 2005; 133:911-4. [PMID: 16181513 PMCID: PMC2870324 DOI: 10.1017/s0950268805003997] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/26/2005] [Indexed: 11/06/2022] Open
Abstract
The lack of information on the immunity of adults in Brazil against diphtheria prompted us to analyse sera from 234 blood donors aged 18-61 years (30.3% females and 69.7% males). IgG diphtheria antitoxin levels determined by means of an ELISA, validated by toxin neutralization test in Vero cells, showed that 30.7% (95% CI 25.0-37.1) of the population was fully protected (>or=1 IU/ml). The highest percentage of subjects fully protected was in the 31-40 years age group. Most of the subjects with uncertain or no protection (<1 IU/ml) were found in the 18-30 years age group (43.8%, OR 2.18, P=0.01). Antitoxin levels were not influenced by the increase in age. Males were more protected than females (80.5%, OR 0.44, P=0.01). The prevalence of 30% of individuals fully protected against diphtheria in blood donors in Rio de Janeiro supports the fact that immunity to diphtheria among healthy Brazilian adults is inadequate. To avoid diphtheria epidemics in the future the immunity among adults should be raised in the coming years.
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Cantanhede LB, Lima JBD, Lopes GS, Farias RF, Bezerra CWB. Uso de sílica e sílica-titânia organofuncionalizadas para a remoção de Cu(II) em aguardentes. FOOD SCIENCE AND TECHNOLOGY 2005. [DOI: 10.1590/s0101-20612005000300018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Lopes GS, Lemos CCS, Mandarim-De-Lacerda CA, Bregman R. Effect of unilateral nephrectomy on renal function of diabetic rats. Histol Histopathol 2004; 19:1085-8. [PMID: 15375750 DOI: 10.14670/hh-19.1085] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Glomerular alterations of experimental diabetes mellitus are observed in animals submitted to a reduction in renal mass, suggesting that some mechanisms responsible for the progression of renal disease are common. The aim of this study was to investigate the effect of nephrectomy on the renal function and morphology of diabetic rats. Male Wistar rats were divided into 4 groups: control (C), n=8; diabetic (DM), n=8; non-diabetic nephrectomized (Nx), n=8; (DMNx), n=9. DM was induced by streptozotocin (65 mg/Kg), and animals were treated with insulin. After 12 weeks, the glomerular filtration rate (GFR), renal plasma flow (RPF) and mean arterial pressure (MAP) were evaluated in unanaesthetized animals. Glomerular volume (GV), glomerular sclerosis index (GSI), mesangial volume density (Vvmes) and glomerular capillary surface density (Svcap) were also evaluated. Results show that kidney weight increased in Nx groups, being higher in DMNx. GFR was higher in Nx groups as was RPF, being higher in DMNx. RVR was lower in Nx groups, especially in DMNx. MAP was not different among the groups. RPF and GFR showed a high correlation for the DMNx group (r=0.95, p=0.02). The DMNx group showed a correlation between RVR and GFR (r=-0.96, p=0.005). The GV increased in Nx groups, and the GSI was higher in DMNx. Vvmes and Svcap increased in DMNx group. In summary, Nx groups developed similar degrees of glomerular hypertrophy, but only DMNx showed an increased value for GSI. The present data suggest that the acceleration of glomerular lesions in DMNx animals was more closely associated to hemodynamic adaptations than to glomerular hypertrophy.
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Gouveia ST, Lopes GS, Fatibello-Filho O, Nogueira ARA, Nóbrega JA. Homogenization of breakfast cereals using cryogenic grinding. J FOOD ENG 2002. [DOI: 10.1016/s0260-8774(01)00037-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Lopes GS, Rioja LS, de Oliveira CA, Santos Oda R. HBsAg in the kidneys of patients with HIV-associated nephropathy (HIVAN). Clin Nephrol 1996; 45:133-4. [PMID: 8846527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
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De Pinho AM, Lopes GS, Ramos-Filho CF, Santos ODR, De Oliveira MP, Halpern M, Gouvea CA, Schechter M. Urinary tract infection in men with AIDS. Genitourin Med 1994; 70:30-4. [PMID: 8300097 PMCID: PMC1195176 DOI: 10.1136/sti.70.1.30] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
OBJECTIVE--To investigate whether bacteriuria and, specifically, symptomatic urinary tract infection (UTI) occur with increased frequency in men with HIV infection. METHODS--In this cross-sectional study we investigated three groups of men, aged from 18 to 50 years. Group A was composed of patients with a diagnosis of AIDS; Group B, of patients without HIV infection, and group C of patients with asymptomatic HIV infection. Patients with any known predisposing factor for UTI were excluded from the study. A clean-catch midstream urine sample was collected from each patient on the first day of hospital admission (groups A and B) or during a visit to the outpatient clinic (group C). Bacteriuria was diagnosed when > or = 100,000 colony forming units/ml, urine were grown. RESULTS--There were 415 patients, 151 in group A, 170 in group B and 94 in group C. Bacteriuria was significantly more frequently in group A (20 cases, 13.3%) than in groups B (3 cases, 1.8%, p = 0.00007) and C (3 cases, 3.2%, p = 0.009). Ten cases of bacteriuria in group A (6.6%) were symptomatic while no case of symptomatic UTI was seen in groups B (p = 0.0004) and C (p = 0.008). The frequency of UTI in homosexual men with AIDS (7 cases, 6.7%) was not significantly different from that observed in men with AIDS who denied homosexuality (3 cases, 6.5%). E coli was the predominant pathogen associated with UTI. Although adequate response to a two-week course of antibiotics was observed in most cases, an in-hospital mortality rate of 20% was found among AIDS patients with symptomatic UTI. CONCLUSIONS--In the present study, the frequency of bacteriuria and symptomatic UTI was found to be increased in men with AIDS. E coli was the predominant pathogen in these cases. These data suggest that symptomatic UTI may represent a relevant cause of morbidity for men with AIDS.
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Marques LP, Rioja LS, de Oliveira CA, Lopes GS, Santos OR. Kidney and HIV-infection. Clin Nephrol 1992; 37:269-70. [PMID: 1606780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
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Lopes GS, Marques LP, Rioja LS, Basilio-de-Oliveira CA, Oliveira AV, Nery AC, Santos ODR. Glomerular disease and human immunodeficiency virus infection in Brazil. Am J Nephrol 1992; 12:281-7. [PMID: 1488997 DOI: 10.1159/000168461] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Clinically overt glomerular disease was detected in 6 (1.1%) of 543 patients with HIV infection followed at a Brazilian National Referral Center for AIDS. In 4 cases, glomerulosclerosis was present (focal and segmental in 3, diffuse and global in 1) and rapid progression to terminal renal failure was observed 1-10 months after clinical presentation. The other 2 patients died with normal renal function, and autopsy studies suggested the diagnosis of minimal change disease. Clinically overt glomerular disease was significantly more common among Black patients, whether all the cases with glomerulopathy (p < 0.001) or just the cases with glomerular sclerosis were considered (p = 0.011). Autopsy study of renal fragments from patients without clinical evidence of glomerular disease was additionally performed and revealed the presence of focal and segmental glomerulosclerosis in 3 cases (7.5%). We concluded that a glomerulopathy with clinicopathological features which match the definition of HIV nephropathy can be found among Brazilian patients with HIV infection. Accordingly to what has been described in American series, Brazilian Black patients seem to be at increased risk of the development of that nephropathy.
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Lopes GS. A Dietary Approach to Chronic Renal Failure. ISSUES IN COMPREHENSIVE PEDIATRIC NURSING 1983; 6:23-62. [PMID: 6549645 DOI: 10.3109/01460868309059837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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