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| 1 | Calcium isotope fractionation and its controlling factors over authigenic carbonates in the cold seeps of the northern South China Sea显示文摘In this study, we analyzed stable calcium isotope results of authigenic carbonates from two cold seep areas of the Dongsha area and the Baiyun Sag in the northern South China Sea. The stable isotopes of carbon and oxygen as well as the mineral composition of authigenic carbonates were used to investigate control calcium isotope fractionation. The δ44/40Ca ratios of the southwestern Dongsha area samples ranged from 1.21‰ to 1.52‰ and the ratio of the Baiyun Sag sample was 1.55‰ of the SRM915a isotope standard. X-ray diffraction analysis showed that the carbonate samples consisted of dolomite, calcite and aragonite, with small amounts of high-Mg calcite and siderite. The δ13C values of the carbonates of the southwestern Dongsha area varied between δ49.21‰ and δ16.86‰ of the Vienna PeeDee Belemnite (VPDB) standard and the δ18O values ranged from 2.25‰ to 3.72‰ VPDB. The δ13C value of the Baiyun Sag sample was 2.36‰ VPDB and the δ18O value was 0.44‰ VPDB. The δ13C values of the carbonates of the southwestern Dongsha area revealed there is methane seeping into this area, with a variable contribution of methane-derived carbon. The sampled carbonates covered a range of δ13C values suggesting a dominant methane carbon source for the light samples and mixtures of δ13C values for the heavier samples, with possibly an organic or seawater carbon source. The δ18O values indicated that there is enrichment in 18O, which is related to the larger oxygen isotope fractionation in dolomite compared to calcite. The results of the Baiyun Sag sample exhibited normal seawater carbon and oxygen isotopic values, indicating that this sample is not related to methane seepage but instead to precipitation from seawater. The relatively high δ44/40Ca values indicated either precipitation at comparatively high rates in pore-water regimes with high alkalinity, or precipitation from an evolved heavy fluid with high degrees of Ca consumption (Raleigh type fractionation). The dolomite samples from the Dongsha area revealed a clear correlation between the carbon and calcium isotope composition, indicating a link between the amount and/or rate of carbonate precipitation and methane contribution to the bicarbonate source. The results of the three stable isotope systems, mineralogy and petrography, show that mineral composition, the geochemical environment of authigenic carbonates and carbon source can control the calcium isotope fractionation. | WANG ShuHong YAN Wen MAGALHAES H Vitor CHEN Zhong PINHEIRO M Luis GUSSONE Nikolaus | 2012 | Chinese Science Bulletin2012，57，11： | 4 |
| 2 | Effectiveness of Helicobacter pylori eradication in the treatment of early-stage gastric mucosa-associated lymphoid tissue lymphoma:An up-to-date meta-analysis显示文摘BACKGROUND Gastric mucosa-associated lymphoid tissue(MALT)lymphoma(GML)is usually a low-grade B-cell neoplasia strongly associated with Helicobacter pylori(H.pylori)-induced chronic gastritis.Clinical practice guidelines currently recommend H.pylori eradication as the preferred initial treatment for early-stage GML.To determine the practical effect of bacterial eradication as the sole initial therapy for early-stage GML,an updated analysis and review of available evidence is imperative.AIM To perform a meta-analysis to assess the rate of complete remission(CR)of H.pylori-positive early-stage GML following bacterial eradication.METHODS We performed independent,computer-assisted literature searches using the PubMed/MEDLINE,Embase,and Cochrane Central databases through September 2022.Prospective and retrospective observational studies evaluating the CR of early-stage GML following bacterial eradication in H.pylori-positive patients.The risk of bias was assessed using Joanna Briggs Institute(JBI)Critical Appraisal Tools.The pooled estimate of the complete histopathological remission rate and respective confidence intervals(95%CI)were calculated following the random-effects model.Heterogeneity and inconsistency were assessed using Cochran’s Q test and I2 statistic,and heterogeneity was defined as P<0.01 and I²>50%,respectively.Subgroup and meta-regression analyses were conducted to explore potential sources of heterogeneity.RESULTS The titles and abstracts of 1576 studies were screened;96 articles were retrieved and selected for full-text reading.Finally,61 studies were included in the proportional meta-analysis(P-MA).Forty-six were prospective and fifteen were retrospective uncontrolled,single-arm,observational studies.The overall risk of bias was low to moderate in all but a single report,with an average critical appraisal score across all studies of 79.02%.A total of 2936 H.pylori-positive early-stage GML patients,in whom H.pylori was successfully eradicated,were included in the analysis.The pooled CR of H.pylori-positive early-stage GML after bacterial eradication was 75.18%(95%CI:70.45%-79.91%).P-MA indicated the substantial heterogeneity in CR reported across studies(I2=92%;P<0.01).Meta-regression analysis identified statistically significant effect modifiers,including the proportion of patients with t(11;18)(q21;q21)-positive GML and the risk of bias in each study.CONCLUSION Comprehensive synthesis of available evidence suggests that H.pylori eradication is effective as the sole initial therapy for early-stage GML.Although the substantial heterogeneity observed across studies limits the interpretation of the pooled overall CR,the present study is a relevant to informing clinical practice. | Fabian Fellipe Bueno Lemos Caroline Tianeze de Castro Mariana Santos Calmon Marcel Silva Luz Samuel Luca Rocha Pinheiro Clara Faria Souza Mendes dos Santos Gabriel Lima Correa Santos Hanna Santos Marques Henrique Affonso Delgado Kádima Nayara Teixeira Cláudio Lima Souza Márcio Vasconcelos Oliveira Fabrício Freire de Melo | 2023 | World Journal of Gastroenterology2023，29，14： | 2 |
| 3 | Role of nickel-regulated small RNA in modulation of Helicobacter pylori virulence factors显示文摘Helicobacter pylori(H.pylori)is a Gram-negative bacterium that infects about half of the world's population.H.pylori infection prevails by several mechanisms of adaptation of the bacteria and by its virulence factors including the cytotoxin associated antigen A(CagA).CagA is an oncoprotein that is the protagonist of gastric carcinogenesis associated with prolonged H.pylori infection.In this sense,small regulatory RNAs(sRNAs)are important macromolecules capable of inhibiting and activating gene expression.This function allows sRNAs to act in adjusting to unstable environmental conditions and in responding to cellular stresses in bacterial infections.Recent discoveries have shown that nickelregulated small RNA(NikS)is a post-transcriptional regulator of virulence properties of H.pylori,including the oncoprotein CagA.Notably,high concentrations of nickel cause the reduction of NikS expression and consequently this increases the levels of CagA.In addition,NikS expression appears to be lower in clinical isolates from patients with gastric cancer when compared to patients without.With that in mind,this minireview approaches,in an accessible way,the most important and current aspects about the role of NikS in the control of virulence factors of H.pylori and the potential clinical repercussions of this modulation. | Fabrício Freire de Melo Hanna Santos Marques Fabian Fellipe Bueno Lemos Marcel Silva Luz Samuel Luca Rocha Pinheiro Lorena Sousa de Carvalho Cláudio Lima Souza Márcio Vasconcelos Oliveira | 2022 | World Journal of Clinical Cases2022，10，31： | 2 |
| 4 | Structure properties of hydroxyapatite obtained by mechanosynthesis 显示文摘 | Silva C C Pinheiro A G Miranda M A R | 2003 | Solid State Sciences2003，5，： | 1 |
| 5 | Photochemical responses and oxidative stress in the clones of Coffea canephora under water deficit conditions显示文摘 | Lima A L S DaMatta F M Pinheiro H A | 2002 | Environmental and Experimental Botany2002，47，23： | 1 |
| 6 | Photochemical responses and oxidative stress in two clones of Coffea canephora under water deficit conditions显示文摘 | LIMA A L S DAMATT F M PINHEIRO H A | 2002 | Environmental and Experimental Botany2002，47，： | 1 |
| 7 | Alterations in car- bon and nitrogen metabolism induced by water deficit in the stems and leaves of Lupinus albus L显示文摘 | PINHEIRO C CHAVES M M RICARDO C P | 2001 | Journal of Experimental Botany2001，52，： | 1 |
| 8 | Photosynthesis underdrought and salt stress:Regulation mechanisms from whole plant to cell 显示文摘 | CHAVES M M FLEXAS J PINHEIRO C | 2009 | Annals of Botany2009，103，： | 1 |
| 9 | Effective Ionization Coefficientsand Electron Drift Velocities in Gas Mixtures of SF6 withHe, Xe, CO2 and N2 from Boltzmann Analysis显示文摘 | Pinheiro M J Loureiro J | 2002 | AppliedPhysics2002，35，23： | 1 |
| 10 | Fed- batch cultivation of Saccharomyces cerevisiae in a hyperbaric bioreactor 显示文摘 | Belo I Pinheiro R Mota M | 2003 | Biotechnology Progress2003，19，2： | 1 |
| 11 | Response of antioxidant enzymes in freshwater fish populations (Leuciscus alburnides complex)to inorginanic pollu- tants exposure显示文摘 | Lopes P A Pinheiro T Santos M C | 2001 | Sci Total Environ2001，280，13： | 1 |
| 12 | Determination of Formaldehyde by Acetaldehyde in Urine by HPLC显示文摘 | Deandrade J B Deandrade M V Pinheiro H L C | 1999 | American Laboratory1999，31，10： | 1 |
| 13 | Incentive to manipulate earnings and its connection to analysts' forecasts, trading, and corporate governance 显示文摘 | Igan D Pinheiro M | 2010 | Journal of Economics and Finance2010，，4： | 1 |
| 14 | EGFR amplification and lack of activating mutations in metaplastic breast carcinomas显示文摘 | Reis-Filho J Pinheiro C Lambros M | 2006 | Pathol2006，209，4： | 1 |
| 15 | Structure properties of hydroxyapatite obtained by mechanosynthesis 显示文摘 | Silva CC Pinheiro A G Miranda M A R | 2003 | Solid StateSci2003，5，3： | 1 |
| 16 | Structural properties of hydroxyapalile obtained by mechanosynlhesis显示文摘 | Silver C C Pinheiro A G Miranda M A R | 2003 | Solid Stale Sciences2003，5，4： | 1 |
| 17 | Self-sustained phase shift modulated resonant converters:modeling,design,and performance显示文摘 | YOUSSEF M Z PINHEIRO H JAIN P K | 2006 | IEEE Transactions on Power Electronics2006，21，2： | 1 |
| 18 | The epitaxial growth of Pd electrodeposition on Au(100) studied by LEED and RHEED 显示文摘 | Pinheiro A L N Zei M S Luo M F | 2006 | Surface Science2006，600，： | 1 |
| 19 | Drought tolerance in relation to protection against oxidative stress in clones of Coffea canephora subjected to long-term drought显示文摘 | Pinheiro H A DaMatta F M Chaves A R M | 2004 | Plant Science2004，167，6： | 1 |
| 20 | Ectodermal dysplasias:a clinical classification and a causal review显示文摘 | Pinheiro M Freire-Maia N | 1994 | Am J Med Genet1994，53，2： | 1 |
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