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Sintering effects on chemical and physical properties of bioactive ceramics

Journal of Advanced Ceramics 2013年第3期2卷 274-284页

作者： Lukasz WITEK James SMAY Nelson R.F.A.SILVA Teja gUDA Joo L.ONg paulo g.coelho School of Chemical Engineering Oklahoma State University423 Engineering NorthStillwaterOKUSA Department of Biomaterials and Biomimetics New York University345 East 24th Street804S New YorkNYUSA Department of Operative Dentistry Universidade Federal de Minas GeraisPampulhaBelo HorizonteMGBrazil Department of Biomedical Engineering University of Texas San AntonioOne UTSA CircleSan AntonioTXUSA Department of Periodontology and Implant Dentistry College of DentistryNew York University345 East 24th StreetNew YorkNYUSA

The objective of this study was to characterize the chemical and physical properties of bioactive ceramics prepared from an aqueous paste containing hydroxyapatite(HA)and beta tri-calcium phosphate(β-TCP).Prior to formulating the paste,HA andβ-TCP were calcined at 800℃and 975℃(11 h),milled,and blended into 15%/85%HA/β-TCP volume-mixed *** cylindrical rods were subsequently sintered to 900℃,1100℃or 1250℃.The sintered specimens were characterized by helium pycnometry,X-ray diffraction(XRD),Fourier transform-infrared(FT-IR),and inductively coupled plasma(ICP)spectroscopy for evaluation of porosity,crystalline phase,functional-groups,and Ca:P ratio,*** properties were assessed via 3-point bending and diametral *** microstructural evaluation using scanning electron microscopy(SEM)showed larger pores and a broader pore size distribution(PSD)for materials sintered at 900℃and 1100℃,whereas the 1250℃samples showed more uniform *** quantification showed significantly higher porosity for materials sintered to 900℃and 1250℃(pg sintering where lower amounts of HA were observed when sintering temperature was *** testing demonstrated significant differences between calcination temperatures and different sintering regimes(pg.

关键词： bone graft material chemical/physical characterization sintering bi-phasic calcium phosphate(BCP)

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Bone Remodeling, Biomaterials And Technological Applications: Revisiting Basic Concepts

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Journal of Biomaterials and Nanobiotechnology 2011年第3期2卷 318-328页

作者： Patricia C.Salgado Plinio C.Sathler Helena C.Castro gutemberg g.Alves Aline M.de Oliveira Rodrigo Cde Oliveira Monica D.C.Maia Carlos R.Rodrigues paulo g.coelho Andre Fuly Lúcio M.Cabral Jose M.granjeiro Program of Post-graduation in Medical Sciences Fluminense Federal UniversityNiteróiBrazil Post-graduation in Biology of Interactions Institute of BiologyFluminense Federal UniversityNiteróiBrazil Program of Post-graduation in Pathology Fluminense Federal UniversityNiteróiBrazil Clinical Research Unit Antonio Pedro HospitalNucleus of Cell TherapyFluminense Federal UniversityNiteróiBrazil School of Odontology Fluminense Federal UniversityNiteróiBrazil Department of Biological Sciences Dental School of BauruSão Paulo UniversitySão PauloBrazil School of Pharmacy Federal University of Rio de JaneiroRio de JaneiroBrazil Department of Biomaterials and Biomimetics New York UniversityNew YorkUSA

Presently, several different graft materials are employed in regenerative or corrective bone surgery. However current misconceptions about these biomaterials, their use and risks may compromise their correct application and development. To unveil these misconceptions, this work briefly reviewed concepts about bone remodeling, grafts classification and manufacturing processes, with a special focus on calcium phosphate materials as an example of a current employed biomaterial. Thus a search on the last decade was performed in Medline, LILACS, Scielo and other scientific electronic libraries using as keywords biomaterials, bone remodeling, regeneration, biocompatible materials, hydroxyapatite and therapeutic risks. Our search showed not only an accelerated biotechnological development that brought significant advances to biomaterials use on bone remodeling treatments but also several therapeutic risks that should not be ignored. The biomaterials specificity and limitations to clinical application point to the current need for developing safer products with better interactions with the biological microenvironments.

关键词： Biocompatible materials Bone remodeling Hydroxyapatite Therapeutic risks

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Physico-chemical characterization of acid base disorders in patients with COVID-19:A cohort study

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World Journal of Nephrology 2024年第2期13卷 16-23页

作者： Sergio Pinto de Souza Juliana R Caldas Marcelo Barreto Lopes Marcelo Augusto Duarte Silveira Fernanda Oliveira coelho Igor Oliveira Queiroz Pedro Domingues Cury Rogério da Hora Passos Department of Nephrology Hospital São RafaelSalvadorBA 41253190Brazil Department of Nephrology D’Or Institute for Research and Education(IDOR)SalvadorBA 41253190Brazil Faculty of Medicine Escola Bahiana de Medicina e Saúde Pública-EBMSPSalvadorBA 40290000Brazil Department of Intensive Care D’Or Institute for Research and Education(IDOR)SalvadorBA 41253190Brazil Hospital São Rafael D’Or Institute for Research and Education(IDOR)SalvadorBA 41253190Brazil Department of Intensive Care Unit Hospital Israelita Albert EinsteinSao PauloSP 05652900Brazil

BACKgROUND Acid-base imbalance has been poorly described in patients with coronavirus disease 2019(COVID-19).Study by the quantitative acid-base approach may be able to account for minor changes in ion distribution that may have been over-looked using traditional acid-base analysis *** a cohort of critically ill COVID-19 patients,we looked for an association between metabolic acidosis surrogates and worse clinical outcomes,such as mortality,renal dialysis,and length of hospital *** To describe the acid-base disorders of critically ill COVID-19 patients using Stewart’s approach,associating its variables with poor *** This study pertained to a retrospective cohort comprised of adult patients who experienced an intensive care unit stay exceeding 4 days and who were diagnosed with severe acute respiratory syndrome coronavirus 2 infection through a positive polymerase chain reaction analysis of a nasal swab and typical pulmonary involvement observed in chest computed tomography *** and clinical data were obtained from electronic *** variables were compared using Fisher’s exact *** data were presented as median and interquartile *** Mann-Whitney U test was used for *** In total,211 patients were *** mortality rate was 13.7%.Overall,149 patients(70.6%)presented with alkalosis,28 patients(13.3%)had acidosis,and the remaining 34 patients(16.2%)had a normal arterial pondus *** those presenting with acidosis,most had a low apparent strong ion difference(SID)(20 patients,9.5%).Within the group with alkalosis,128 patients(61.0%)had respiratory *** non-survivors were older,had more comorbidities,and had higher Charlson’s and simplified acute physiology score *** did not find severe acid-base imbalance in this *** analyzed Stewart’s variables(effective SID,apparent SID,and strong ion gap and the effect of albumin,lactate,phosphorus,and chloride)were not d

关键词： COVID-19 Physicochemical approach Acid-base status Critically ill patients Acute respiratory syndrome

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Novel preoperative strategies to improve hepatocellular carcinoma resectability

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Hepatobiliary Surgery and Nutrition 2023年第1期12卷 140-141页

作者： Francisco Tustumi Fabricio Ferreira coelho paulo Herman Department of gastroenterology Universidade de São PauloSao PauloBrazil Department of Surgery Hospital Israelita Albert EinsteinSao PauloBrazil

Peng et al.(1)performed a pretty interesting article,reporting the proposal of a new strategy to improve resectability for hepatocellular carcinoma(HCC).Their findings are *** strategies to improve liver resection are methods for promoting future liver remnant(FLR)growth in a timely manner before cancer *** main strategies are portal vein embolization(PVE)and associating liver partition and portal vein ligation for staged hepatectomy(ALPPS).

关键词： hepatocellular liver

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Repeat hepatectomy for recurrent colorectal liver metastases:A comparative analysis of short-and long-term results

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Hepatobiliary & Pancreatic Diseases International 2022年第2期21卷 162-167页

作者： paulo Figueiredo Costa Fabricio Ferreira coelho Vagner Birk Jeismann Jaime Arthur Pirola Kruger gilton Marques Fonseca Ivan Cecconello paulo Herman Digestive Surgery Brazilian College of Digestive Surgery(Colégio Brasileiro de Cirurgia Digestiva-CBCD) São PauloBrazil Digestive Surgery Division Department of GastroenterologyUniversity of São Paulo School of MedicineSão PauloBrazil Instituto do Câncer do Estado de São paulo(ICESP) São PauloBrazil

Background: Liver recurrence after resection of colorectal liver metastases(CRLM) is frequent. Repeat hepatectomy has been shown to have satisfactory perioperative results. However, the long-term outcomes and the benefts for patients with early recurrence have not been clarifed. The aim of this study was to compare the short-and long-term outcomes of patients undergoing single hepatectomy and repeat hepatectomy for CRLM. Additionally, the oncological outcomes of patients with early( ≤ 6 months) and late recurrence who underwent repeat hepatectomy were compared. Methods: Consecutive adult patients undergoing hepatectomy for CRLM between June 20 0 0 and February 2020 were included and divided into two groups: single hepatectomy and repeat hepatectomy. Results: A total of 709 patients were included: 649 in the single hepatectomy group and 60 in the repeat hepatectomy group. Patients in the repeat hepatectomy group underwent more cycles of preoperative chemotherapy [4(3-6) vs. 3(2-4), P = 0.003]. Patients in the single hepatectomy group more frequently underwent major hepatectomies(34.5% vs. 16.7%, P = 0.004) and had a greater number of lesions resected(2.9 ± 3.6 vs. 1.9 ± 1.8, P = 0.011). There was no increase in operative time, estimated blood loss, length of hospital stay, complications, or mortality in the repeat hepatectomy group. There were no differences in overall survival( P = 0.626) and disease-free survival( P = 0.579) between the two groups. Similarly, for patients underwent repeat hepatectomy, no difference was observed between the early and late recurrence groups in terms of overall survival( P = 0.771) or disease-free survival( P = 0.350). Conclusions: Repeat hepatectomy is feasible and safe, with similar short-and long-term outcomes when compared to single hepatectomy. Surgical treatment of early liver recurrence offers similar oncological outcomes to those obtained for late recurrence.

关键词： Colorectal cancer Metastasis Hepatectomy Postoperative complications Survival analysis

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Does microfinance foster the development of its clients?A bibliometric analysis and systematic literature review

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Financial Innovation 2022年第1期8卷 1023-1057页

作者： João paulo coelho Ribeiro Fábio Duarte Ana Paula Matias gama CIICESI ESTGPolitécnico do PortoPortoPortugal School of Economics and Management and cef.upUniversity of PortoPortoPortugal Research Center in Business Science(NECE) University of Beira InteriorCovilhãPortugal

This paper conducts a scientometric analysis and systematic literature review to identify the trends in microfinance outcomes from the perspective of their recipients,specifically more vulnerable people,while also focusing on the demand *** the keywords“co-occurrence networks”and“citation networks,”we examined 524 studies indexed on the ISI Web of Science database between 2012 and March *** subsequent content analysis of bibliometric-coupled articles concerns the main research topics in this field:the socioeconomic outcomes of microfinance,the dichotomy between social performance and the mission drift of microfinance institutions,and how entrepreneurship and financial innovation,specifically through crowdfunding,mitigate poverty and empower the more *** findings reinforce the idea that microfinance constitutes a distinct field of development thinking,and indicate that a more holistic approach should be adopted to boost microfinance outcomes through a better understanding of their *** trends in this field will help policymakers,regulators,and academics to examine the nuts and bolts of microfinance and identify the most relevant areas of intervention.

关键词： Microfinance Microcredit Bibliometric analysis Economics Business finance

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Laparoscopic resection for hepatocellular carcinoma: eastern and western experiences

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Chinese Journal of Cancer Research 2014年第3期26卷 234-236页

作者： paulo Herman Fabricio Ferreira coelho Liver Surgery Unit Department of GastroenterologyUniversity of Sao Paulo Medical School

Hepatocellular carcinoma （HCC） is the most common primary liver cancer （1）. The incidence is rising in the last decades due to many factors, especially hepatitis C, alcoholic liver disease and non-alcoholic steatohepatitis. Moreover, the introduction of screening programs in patients with chronic liver disease has led to an increase in HCC diagnosis （1,2）. In the western world, 80% to 90% of HCC eases occur in patients with liver cirrhosis （3） while this proportion is lower in some regions in Asia and sub-Saharian Africa, where hepatitis B remains as an important etiologic factor for chronic liver disease （2,4）. In 1990, the annual world frequency of HCC was 437,000 cases/year （1）, and in 2012 the number reached 782,200 cases/year being responsible for 746,000 deaths （5）. Nowadays, HCC represents the 6th most frequent neoplastic disease in the world and the 3rd in mortality （5）.

关键词： HCC eastern and western experiences Laparoscopic resection for hepatocellular carcinoma

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Current status and future perspectives of radiomics in hepatocellular carcinoma

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World Journal of gastroenterology 2023年第1期29卷 43-60页

作者： Joao Miranda Natally Horvat gilton Marques Fonseca Jose de Arimateia Batista Araujo-Filho Maria ClaraFernandes Charlotte Charbel Jayasree Chakraborty Fabricio Ferreira coelho Cesar Higa Nomura paulo Herman Department of Radiology University of Sao PauloSao Paulo 05403-010Brazil Department of Radiology Memorial Sloan-Kettering Cancer CenterNew YorkNY 10065United States Department of gastroenterology University of Sao PauloSao Paulo 05403-000Brazil Department of Radiology Hospital Sirio-LibanesSao Paulo 01308-050Brazil Department of Surgery Memorial Sloan-Kettering Cancer CenterNew YorkNY 10065United States Department of Radiology University of Sao PauloSao Paulo 05403-000Brazil

given the frequent co-existence of an aggressive tumor and underlying chronic liver disease,the management of hepatocellular carcinoma(HCC)patients requires experienced multidisciplinary team ***,imaging plays a key role in the diagnosis,staging,restaging,and surveillance of ***,imaging assessment of HCC entails the assessment of qualitative characteristics which are prone to inter-reader *** is an emerging field that extracts high-dimensional mineable quantitative features that cannot be assessed visually with the naked eye from medical *** main potential applications of radiomic models in HCC are to predict histology,response to treatment,genetic signature,recurrence,and *** the encouraging results to date,there are challenges and limitations that need to be overcome before radiomics implementation in clinical *** purpose of this article is to review the main concepts and challenges pertaining to radiomics,and to review recent studies and potential applications of radiomics in HCC.

关键词： Radiomics Hepatocellular carcinoma Texture analysis Radiology

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Performance of aerogel as a thermal insulation material towards a sustainable design of residential buildings for tropical climates in Nigeria

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Energy and Built Environment 2022年第3期3卷 291-315页

作者： Aminu Wali Bashir Brenda Chaves coelho Leite Departamento de Engenharia de Construção Civil Escola Politécnica da Universidade de São PauloSão Paulo 05508-010Brasil

The building sector accounts for nearly 40%of global energy *** Nigeria,more than two-thirds of the consumption comes from residential *** efficiency measures through the adoption of insulation materials are tools that could crash the peak demand of energy in buildings while improving its thermal comfort and aerogel is considered as the most effective material for insulation,owing to its unique thermal *** this paper,we present the performance of aerogel as a thermal insulation material towards a sustainable design of residential buildings for tropical climates in ***,a typical residential building in the tropical region was modeled with conventional materials utilized in the region and was later modified through the application of aerogel material on various surfaces of the model.A whole building energy simulation was then carried out in each variation and the outcome was compared to effectively conclude on the significance of aerogel in terms of thermal comfort improvement and energy consumption *** show that aerogel had the highest influence when inserted in the attic and floor slabs of the designed model.A reduction of more than 6%was attained in the recorded indoor mean air and operative temperatures while still maintaining an acceptable humidity *** energy consumption,a reduction of more than 15%was ***,the high price of aerogel may hinder its application on the studied building but could be a good investment where climate change and sustainability are of high importance and less concern is given to *** demonstrated significant potential with respect to both thermal comfort improvement and energy consumption reduction on the designed *** outcome of the study is hoped to serve as a base reference for the insulation of residential buildings with similar climate and characteristics to the adopted case building.

关键词： Aerogels Building energy consumption Energy efficiency Thermal insulation materials Thermal comfort Building energy simulation

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Obtaining 2D Soil geotechnical Profiles from Cokriging Interpolation of Sample Data and Electrical Resistivity Tomography (ERT)—Applications in Mass Movements Studies

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International Journal of geosciences 2024年第7期15卷 525-548页

作者： Cassiano Antonio Bortolozo Noel Howley Andy Legg Tristan Pryer Danielle Silva de Paula Tatiana Sussel gonçalves Mendes Daniel Metodiev Marcio Roberto Magalhães de Andrade Silvio Jorge coelho Simões Maiconn Vinicius de Moraes Marcio Augusto Ernesto de Moraes Luana Albertani Pampuch Rodolfo Moreda Mendes Harideva Marturano Egas Institute of Science and Technology So Paulo State University (UNESP) So Jos dos Campos Brazil Cemaden-National Center for Monitoring and Early Warning of Natural Disasters General Coordination of Research and Development So Jos dos Campos Brazil Institute for Mathematical Innovation University of Bath Bath UK Department of Mathematical Sciences University of Bath Bath UK

Brazil annually faces significant challenges with mass movements, particularly in areas with poorly constructed housing, inadequate engineering, and lacking sanitation infrastructure. Campos do Jordão, in São paulo state, is a city currently grappling with these issues. This paper details a study conducted within a pilot area in Campos do Jordão, where geophysical surveys and geotechnical borehole data were integrated. The geophysical surveys provided 2D profiles, and samples were collected to analyse soil moisture and plasticity. These datasets were combined using a Cokriging-based model to produce an accurate representation of the subsurface conditions. The enhanced modelling of subsurface variability facilitates a deeper understanding of soil behavior, which can be used to improve landslide risk assessments. This approach is innovative, particularly within the international context where similar studies often do not address the complexities associated with urban planning deficits such as those observed in some areas of Brazil. These conditions, including the lack of proper sanitation and irregular housing, significantly influence the geological stability of the region, adding layers of complexity to subsurface assessments. Adapting geotechnical evaluation methods to local challenges offers the potential to increase the efficacy and relevance of geological risk management in regions with similar socio-economic and urban characteristics.

关键词： Mass Movements geophysics ERT geotechnical Surveys Campos do Jordão Cokriging

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