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Preliminary study on modelling, fabrication by photo-chemical etching and in vivo testing of biodegradable magnesium AZ31 stents

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Bioactive Materials 2021年第6期6卷 1663-1675页

作者： Bala Subramanya Pavan Kumar Kandala Guangqi Zhang Capucine LCorriveau Mark Paquin madeleine chagnon Dana Begun Vesselin Shanov Department of Mechanical and Materials Engineering University of CincinnatiOH45221USA Department of Chemical and Environmental Engineering University of CincinnatiOH45221USA Charles River Laboratories Montreal ULC BoisbriandQuebecJ7H 1N8Canada Medical Products Market Consulting IncIndianapolisIN46202USA Waygate Technologies Baker HughesCincinnatiOH45241USA

Magnesium metal(Mg)is a promising material for stent applications due to its biocompatibility and ability to be resorbed by the *** of stents by laser cutting has become an industry *** alternative approach uses photo-chemical etching to transfer a pattern of the stent onto a Mg *** this study,we present three stages of creating and validating a stent prototype,which includes design and simulation using finite element analysis(FEA),followed by fabrication based on AZ31 alloy and,finally,in vivo testing in peripheral arteries of domestic *** to the preliminary character of this study,only six stents were implanted in two domestic farm pigs weighing 25-28 kg and they were evaluated after 28 days,with an interim follow-up on day *** left and right superficial femoral,the left iliac,and the right renal artery were selected for this *** diameters of the stented artery segments were evaluated at the time of implantation,on day 14 and then,finally,on day 28,by quantitative vessel analysis(QVA)using fluoroscopic *** Coherence Tomography(OCT)imaging displayed some malposition,breaks,stacking,and protrusion into the lumen at the proximal,distal,and mid-sections of the stented *** stents degraded with time,but simultaneously became embedded in the *** 28 days,the animals were euthanized,and explanted vessels were fixed for micro-CT imaging and histology ***-CT imaging revealed stent morphological and volumetric changes due to the in-body *** in vivo corrosion rate of 0.75 mm/year was obtained by the CT *** histology suggested no-life threatening effects,although moderate injury,inflammation,and endothelialization scores were observed.

关键词： Magnesium alloy FEA modelling Stents Photo-chemically etching Micro-CT Histology

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Mantle avalanches in a Venus-like stagnant lid planet

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Earth and Planetary Physics 2024年第5期8卷 686-702页

作者： madeleine C.Kerr Dave R.Stegman Institute of Geophysics and Planetary Physics Scripps Institution of Oceanography University of California

Stagnant lid planets are characterized by a globe-encircling, conducting lid that is thick and strong, which leads to reduced global surface heat flows. Consequently, the mantles of such planets can have warmer interiors than Earth, and interestingly, a pyrolitic mantle composition under warmer conditions is predicted to have a distinctly different mantle transition zone compared to the present-day Earth(Hirose, 2002; Stixrude and Lithgow-Bertelloni, 2011; Ichikawa et al., 2014; Dannberg et al, 2022). Instead of olivine primarily transforming into its higher-pressure polymorphs such as wadsleyite and then ringwoodite, at pressures corresponding to410 km and 520 km depth in Earth, respectively, it instead transforms into a mineral assemblage of wadsleyite, majorite, and ferropericlase(WMF), and then to majorite + ferropericlase(MF), before finally transforming into bridgmanite at pressures corresponding to 660 km depth in Earth(Stixrude and Lithgow-Bertelloni, 2011; Ichikawa et al., 2014). Convective motions in stagnant lid planets are dominated by small-scale instabilities(cold drips) forming within the mobile rheological sublayer under the rigid lid. Using ASPECT and a thermodynamic model of a pyrolitic mantle composition generated by HeFESTo, we show that under certain conditions, the small drips can pond atop the WMF-MF mineral phase transition. The barrier to convective flow arises from the WMF mineral phase assemblage having an effective negative thermal expansivity(Stixrude and Lithgow-Bertelloni, 2022). Although large-scale downwellings that typically occur within mobile lid planets are able to pass through the WMF zone without difficulty(Dannberg et al., 2022; Li RP et al.,2024), the smaller and less negatively buoyant nature of downwelling drips in stagnant lid planets are more susceptible to these effects,which leads to an ephemeral layering of the mantle. Our numerical models show that in stagnant lid planets with mantle potential temperatures that exceed

关键词： Venus mantle avalanches numerical modelling phase transitions

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PROCEED外科网片的抗腹部粘连实验

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外科理论与实践 2005年第2期10卷 185-186页

作者： Richard W.Hutchinson madeleine chagnon L.Thomas Divilio 王晔鸣美国强生爱惜康研究发展中心

以往腹壁疝传统的治疗方法是在有张力的条件下用缝线对合组织,以补缺损.近年来,为达到无张力下修补,各种网片的应用乃应时而生[1].

关键词：外科网片疝腹部外科手术

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A Biogas Production Model from the Combination of Pig Manure and Cow Dung in N’Zérékoré City, Republic of Guine

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Energy and Power Engineering 2024年第9期16卷 293-312页

作者： madeleine Kamano Oumar Keita Ansoumane Sakouvogui Aboubacar Sangare Department of Physics Universit de NZrkor NZrkor Guinea Department of Hydrology Universit de NZrkor NZrkor Guinea Department of Energy Institut Suprieur de Technologie de Mamou Mamou Guinea Department of Environmental Engineering Université de NZérékoré NZérékoré Guinea

This present research work focuses on the valorization of pig droppings for production of biogas in mono digestion and co-digestion with proportions of cow dung from the urban commune of N’Zérékoré. It was carried out in December 2020 in the Physics laboratory of the University of N’Zérékoré. The anaerobic digestion process took 25 days in an almost constant ambient temperature of 25˚C. Five digesters were loaded on 12/06/2020, two of which with 1 kg of pig dung and 1 kg of cow dung both in mono-digestion. The 3 other digesters in co-digestion with different proportions of pig manure and cow dung. The substrate in each digester is diluted in 2 liters of water, with a proportion of (1/2). The main results obtained are: 1) the evolution of the temperature and pH during digestion process, 2) the average biogas productions 0.61 liters for (D1);1.20 liter for (D2);1.65 liter for (D3);1.51 liter for (D4) and 1.31 liter for (D5). The cumulative amounts of biogas are respectively: D1 (7.95 liters), D2 (15.60 liters), D3 (21.50 liters), D4 (19.65 liters) and D5 (17.05 liters). The total cumulative production is 81.75 liters at the end of the process. The originality of this research work is that the proposed model examines the relation between the daily biogas production and the variation of temperature, pH and pressure. The combustibility test showed the biogas produced during the first week was no combustible (contains less than 50% methane). Combustion started from the biogas produced from the 15th day and it is from the 20th day that a significant amount of stable yellow/blue flame was observed. The results of this study show the combination of pig manure and cow dung presents advantages for optimal biogas production.

关键词： Production Experimental Model Pig Manure Cow Dung Biogas N’Zérékoré Republic of Guinea

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Monogenic deficiency in murine intestinal Cdc42 leads to mucosal inflammation that induces crypt dysplasia

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Genes & Diseases 2024年第1期11卷 413-429页

作者： Dongsheng Zhang Wenjuan Tang Haitao Niu William Tse Hai-Bin Ruan Helmut Dolznig Thomas Knosel Friedrich Karl-Heinz madeleine Themanns Jiang Wang Mingquan Song Lee Denson Lukas Kenner Richard Moriggl Yi Zheng Xiaonan Han Division of Hematology and Oncology Division of Cancer BiologyDepartment of MedicineMetroHealth Medical Center(MHMC)Case Western Reserve University(CWRU)School of MedicineClevelandOH 44109USA Cancer Genomics and Epigenomics Program Case Comprehensive Cancer CenterCase Western Reserve University(CWRU)ClevelandOH 44106USA Division of Gastroenterology Hepatology and NutritionCincinnati Children’s Hospital Medical Center(CCHMC)CincinnatiOH 45229USA Children’s Hospital of Fudan University Shanghai 201102China School of Medicine Jinan UniversityGuangzhouGuangdong 510632China Laboratory Animal Science(ILAS) Chinese Academy of Medical Science(CAMS)and Peking Union Medical College(PUMC)Beijing 100006China Department of Integrative Biology and Physiology University of Minnesota Medical SchoolMinneapolisMI 55455USA Institute of Medical Genetics Medical University of ViennaVienna 1040Austria Institute of Pathology Ludwig-Maximilians-University MunichMunich 80539Germany Institute of Biochemistry II University Hospital JenaJena 07743Germany Laboratory Animal Pathology University of Veterinary Medicine ViennaVienna 1210Austria Department of Pathology University of CincinnatiCincinnatiOH 45221USA Department of Gastroenterology The Affiliated Hospital of Qingdao UniversityQingdaoShandong 266005China Department of Pathology Medical University of ViennaVienna 1040Austria Ludwig Boltzmann Institute for Cancer Research Vienna 1090Austria Medical University of Vienna Vienna 1040Austria Institute of Animal Breeding and Genetics University of Veterinary Medicine ViennaVienna 1210Austria Division of Experimental Hematology CCHMCCincinnatiOH 45229USA

CDC42 controls intestinal epithelial(IEC)stem cell(IESC)*** aberrant CDC42 initiates intestinal inflammation or neoplasia is *** utilized models of inflam-matory bowel diseases(IBD),colorectal cancer,aging,and IESC injury to determine the loss of intestinal Cdc42 upon inflammation and *** specimens were collected to determine the levels of CDC42 in IBD or colorectal ***42 floxed mice were crossed with Villin-Cre,Villin-CreERT2 and/or Lgr5-eGFP-IRES-CreERT2,or Bmi1-CreERT2 mice to generate Cdc42 deficient ***,colitis,aging,and intestinal organoid were used to evaluate CDC42 upon mucosal inflammation,IESC/progenitor regenerative capacity,and IEC *** studies revealed that increased CDC42 in colorectal cancer correlated with lower survival;in contrast,lower levels of CDC42 were found in the inflamed IBD *** Cdc42 depletion significantly reduced Lgr5+IEsCs,increased progenitors'hyperplasia,and induced mucosal inflammation,which led to crypt *** Cdc42 depletion markedly enhanced irra-diation-or chemical-induced *** or inhibition of Cdc42 reduced colonic Lgr5+IESC *** conclusion,depletion of Cdc42 reduces the IESC regeneration and IEC repair,leading to prolonged mucosal *** monogenic loss of Cdc42 in-duces mucosal inflammation,which could result in intestinal neoplasia in the context of aging.

关键词： Cell divisioncycle 42(CDC42) Colitis Colorectal cancer(CRC) Inflammatory bowel diseases(IBD) Intestinal epithelial cell(IEC) Intestinal epithelial stem cell(IESC) Irradiation

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Prevalence and Factors Associated with Low Back Pain among Healthcare Workers in Two Hospitals in Yaoundé-Cameroon: A Cross-Sectional Study

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Open Journal of Rheumatology and Autoimmune Diseases 2024年第3期14卷 89-107页

作者： Brian Gweha Ahmadou Musa Jingi Baudelaire Fojo Talongong Claude Tayou madeleine Singwé-Ngandeu Department of Clinical Sciences Faculty of Health Sciences The University of Bamenda Bamenda Cameroon Faculty of Medicine and Biomedical Sciences The University of Yaound Yaound Cameroon The Rheumatology Unit The Yaound Central Hospital Yaound Cameroon The Hematology Laboratory The Yaound University Teaching Hospital Yaound Cameroon

Background: Low back pain (LBP) is a very common health problem amongst the general population and a major cause of disability that affects work performance and well-being. Healthcare workers (HCWs) are especially at risk of developing LBP because of physical and emotional factors. Little is known about the burden of LBP in Cameroon. Objective: To determine the prevalence of low back pain and identify its associated factors among healthcare workers. Methods: A cross-sectional study using a self-administered questionnaire was conducted among healthcare workers in the Yaound Central Hospital and the Yaound University Teaching Hospital. The questionnaire collected data regarding recent, past year and lifetime occurrences of LBP, socio-demographics and work conditions. Data were analysed using IBM Statistical Package for Social Sciences (SPSS) version 26. Results: A total number of 268 HCWs participated in the study, including 197 (73.5%) females and 71 (26.5%) males. The mean age of the study participants was 40.60 8.38 years (extremes of 20 and 65 years). The lifetime, annual, and point prevalences of LBP among the participants were 67.5% (CI: 61.6 - 73.1), 61.5% (CI: 55.6 - 67.1) and 35.7% (CI: 29.7 - 41.5) respectively. Multivariate analysis confirmed a moderate stress level, a sedentary lifestyle, working in the medicine and specialities department, lifting heavy objects and bending to work as associated factors to LBP. Most sufferers had a minimal functional disability (65.7%) while 34.3% had a moderate to severe disability. Conclusions: Healthcare providers have a considerably high prevalence of low back pain. Factors associated with LBP found in this study were similar to those widely recognized in the literature. A substantial proportion of healthcare providers are suffering from functional disability associated with low back pain, affecting their social and work lives. There is a need for multilevel interventions to prevent and control low back pain in this hi

关键词： Prevalence Associated Factors Low Back Pain Healthcare Workers Yaoundé

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Social determinants of gastrointestinal malformation mortality in Brazil:a national study

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World Journal of Pediatric Surgery 2024年第2期7卷 134-141页

作者： Ayla Gerk Amanda Rosendo Luiza Telles Aricia Gomes Miranda madeleine Carroll Bruna Oliveira Trindade Sarah Bueno Motter Esther Freire Gabriella Hyman Julia Ferreira Fabio Botelho Roseanne Ferreira David P Mooney Joaquim Bustorff-Silva Program in Global Surgery and Social Change Harvard Medical SchoolBostonMassachusettsUSA Faculty of Medicine and Health Sciences McGill UniversityMontrealQuebecCanada Harvey E.Beardmore Division of Pediatric Surgery The Montreal Children's HospitalMcGill University Health CentreMontrealQuebecCanada Department of Surgery Universidade Estadual de Campinas(UNICAMP)CampinasBrazil Instituto de Educação Médica(IDOMED/Estácio Campus Vista Carioca)Rio de JaneiroBrazil Faculty of Medicine Universidade Federal do Delta do ParnaibaParnaibaPiauiBrazil Universidade Federal de Ciencias da Saude de Porto Alegre Porto AlegreBrazil Universidade Federal da Bahia SalvadorBrazil Department of Health Research Methods McMaster UniversityHamiltonSouthern OntarioCanada Department of Pediatric Surgery Boston Children's HospitalBostonMassachusettsUSA

Introduction In Brazil,approximately 5%are born with a congenital disorder,potentially fatal without *** study aims to evaluate the relationship between gastrointestinal congenital malformation(GICM)mortality,health indicators,and socioeconomic factors in *** GICM admissions(Q39-Q45)between 2012 and 2019 were collected using national *** demographics,socioeconomic factors,clinical management,outcomes,and the healthcare workforce density were also accounted *** Surgical Workforce density and the number of neonatal intensive care units in a region were extracted from national datasets and combined to create a clinical index termed'NeoSurg'.Socioeconomic variables were combined to create a socioeconomic index termed SocEcon'.Simple linear regression was used to investigate if the temporal changes of both indexes were *** correlation between mortality and the different indicators in Brazil was evaluated using Pearson's correlation *** Over 8 years,Brazil recorded 12804 GICM *** Southeast led with 6147 cases,followed by the Northeast(2660),South(1727),North(1427),and Midwest(843).The North and Northeast reported the highest mortality,lowest NeoSurg,and SocEcon Index ***,mortality rates declined across regions from 7.7%(2012)to 3.9%(2019),a 51.7%*** North and Midwest experienced the most substantial reductions,at 63%and 75%,*** significantly correlated with the indexes in nearly all regions(p<0.05).Conclusion Our study highlights the correlation between social determinants of health and GICM mortality in Brazil,using two novel indexes in the pediatric *** findings provide an opportunity to rethink and discuss new indicators that could enhance our understanding of our country and could lead to the development of necessary solutions to tackle existing challenges in Brazil and globally.

关键词： Northeast Brazil globally

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Interleukin 6 and Bone Erosions in Rheumatoid Arthritis in an African Hospital

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Open Journal of Rheumatology and Autoimmune Diseases 2024年第1期14卷 13-19页

作者： Paul Eloundou Aly Kamissoko Fernando Kempta Francine Same Bebey William Beko’o Ange Ngeuleu William Nguekouo Estelle Megne Suzy Manizou madeleine Singwe Faculty of Medicine and Pharmaceutical Sciences University of Douala Douala Cameroon Department of Internal Medicine Cité Verte District Hospital Yaounde Cameroon Cameroon CHU Ignace Deen Conakry Guinea Faculty of Medicine University of Dschang Dschang Cameroon Faculty of Medicine and Biomedical Sciences Yaoundé University of Yaoundé I Yaounde Cameroon

Introduction: Rheumatoid arthritis (RA) is a chronic, erosive and deforming inflammatory rheumatic disease. In the era of biotherapies and the arrival of biosimilars in sub-Saharan Africa, the objective of this study was to describe plasma IL-6 variations in RA patients at Cité Verte District Hospital (Cameroon). Material and Methods: Descriptive and analytical cross-sectional study from December 1, 2021 to May 31, 2022. We included patients over 18 years old suffering from RA (ACR/EULAR 2010). Patients with an infection were not included. The data collected were age, sex, smoking status, family history, disease duration, disease activity by DAS28, CRP, rheumatoid factor, and plasma level of IL-6. Bone erosion was sought on radiography and ultrasound. Result: We included 31 patients, 25 of whom were women (80.6%). The mean age was 47.27 ± 17.97 years. Disease activity was predominantly moderate (32.3%) and severe (32.3%). Mean IL-6 level was 15.29 ± 2.36 pg/ml (extremes: 11.26 pg/ml and 20.15 pg/ml). IL-6 levels were higher in patients with a history of smoking. Similarly, IL-6 levels were higher in patients with mildly active RA in remission than in moderately and severely active RA. Mean IL-6 levels were significantly higher in patients with erosive RA (16.3 pg/ml VS 14.6 pg/ml). Conclusion: IL-6 levels were significantly elevated in men, weaned smokers and patients with bone erosions.

关键词： Rheumatoid Arthritis Interleukin 6 Bone Erosion-DAS28 Sub-Saharan Africa

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癌症特异性多属性效用量表FACT-8D研制与应用介绍

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中国卫生经济 2024年第4期43卷 17-20页

作者：曹译尹 madeleine T.King David Cella 李浩飞贾燕妮周澜谷文施佳轩黄卫东罗南哈尔滨医科大学卫生管理学院哈尔滨150081 悉尼大学医学院悉尼2006 西北大学范伯格医学院芝加哥60601 新加坡国立大学苏瑞福公共卫生学院新加坡117549

八维癌症特异性效用量表(FACT-8D)的开发为癌症领域经济学评价研究,尤其是癌症患者的健康效用值测量提供了新的工具选择。部分国家已经完成或正在进行FACT-8D健康效用积分体系的构建,但国内关于该量表的信息仍然有限。文章对FACT-8D进... 详细信息

八维癌症特异性效用量表(FACT-8D)的开发为癌症领域经济学评价研究,尤其是癌症患者的健康效用值测量提供了新的工具选择。部分国家已经完成或正在进行FACT-8D健康效用积分体系的构建,但国内关于该量表的信息仍然有限。文章对FACT-8D进行系统介绍,首先,简述FACT-8D的开发过程及健康状态分级系统;其次,以澳大利亚为例,介绍FACT-8D健康效用积分体系的构建方法、流程和结果;再次,总结FACT-8D的测量属性;最后,对该量表的应用与发展进行展望。总之,应尽早参考标准化方案构建基于中国人群的FACT-8D效用积分体系,进一步验证FACT-8D的测量属性,探索针对不同癌症种类患者的“附加”维度。

关键词：八维癌症特异性效用量表癌症健康效用效用积分体系

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“FISH VERTEBRA” about 3 Sickle Cell Patients Followed at Laquintinie Hospital, Douala

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Open Journal of Rheumatology and Autoimmune Diseases 2024年第1期14卷 20-25页

作者： Same Bebey Francine Mbono Betoko Ritha Eloundou Onomo Paul Mantho Fopa Pauline Eposse Ekoube Charlotte Megne Tamo Estelle Ebene Mbende Romain Singwe Ngandeu madeleine Rheumatology Unit Laquintinie Hospital Douala Douala Cameroon Paediatric Unit Laquintinie Hospital Douala Douala Cameroon La Cite Verte Hospital Yaounde Yaounde Cameroon Paediatric Surgery Unit Laquintinie Hospital Douala Douala Cameroon La Cite des palmiers Hospital Douala Douala Cameroon Rheumatology Unit Central Hospital Yaounde Yaounde Cameroon

Vertebral involvement in particular is common in sickle cell patients. We report 3 cases of “fish vertebra” fractures in sickle cell patients aged 16, 18, and 24 years old respectively at Laquintinie Hospital, Douala. When the vertebral fractures were diagnosed, the 3 patients had back pain and kyphosis deformities of the dorsal spine. Treatment with an infusion of biphosphonates (zoledronic acid at a dose of 0.5 mg·per·kg) was offered to all three patients. Two out of three patients received treatment with biphosphonates with a successful outcome. Profound vitamin D deficiency is associated with increased bone remodeling and a history of fractures. In sickle cell anemia, vertebral fractures may also result from bone fragility, which is often overlooked as aseptic osteonecrosis and osteomyelitis, which are very often suspected.

关键词： Vertebral Fractures Sickle Cell Anemia Vertebral Bone Fragility

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