检索结果-南通市图书馆

Journal of Geoscience and Environment Protection 2019年第6期7卷 1-12页

作者： Adriana Monica Dalla Vecchia jorge carvalho de Lena Ana Claudia Queiroz Ladeira Center for Development of Nuclear Technology Belo Horizonte Brazil Department of Geology Federal University of Ouro Preto Ouro Preto Brazil

This work presents a Principal Component Analysis (PCA) study using Pbisotope signatures and U, Th and Pb concentrations from groundwater, sediments and rocks (granites and orthogneisses) of the Complex of Lagoa Real (Bahia, Brazil). This area is naturally enriched in U and Th, with the occurrence of Pb derived from the radioactive decay of the elements (238U, 235U and 232Th) in the form of their stable isotopes 206Pb, 207Pb and 208Pb in addition to the natural isotope 204Pb. Sampling was carried out in the rainy season (December to January) and the points were selected according to regional hydrology and geology. Thirty samples were analyzed: 12 of groundwater (AP) and 18 of sediments (S). The results show that the use of isotopic ratios allows discrimination between geogenic and anthropogenic samples. This information is not obtained using only the analysis of concentration data. Statistically, the isotopic data of Pb stand out as an efficient tool in the characterization of sources in the scenario investigated, allowing an effective environmental monitoring and a better management of the mining activities.

关键词： Environmental Monitoring Statistical Analysis Lead Stable Isotopes Anthropogenic Sources Geogenic Sources

Use of Extra-Narrow-Diameter Implants in Reduced Alveolar Ridge:A Case Report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Biomaterials and Nanobiotechnology 2020年第2期11卷 101-109页

作者： Camila Ferreira Mattos Marco Antonio Alencar De carvalho jorge Jose De carvalho Paulo Goncalo Pinto Dos Santos jorge Luis Da Silva Pires Igor Da Silva Brum Department of Implantology Faculty of DentistryState University of Rio de JaneiroRio de JaneiroBrazil Department of Biology Faculty of DentistryState University of Rio de JaneiroRio de JaneiroBrazil

Background: Narrow-diameter implants (3.0 - 3.5 mm range) have been introduced for the replacement of teeth with insufficient bone structure and/or limited mesiodistal or interimplant spaces, and appear to offer clinical results similar to those obtained with implants of greater diameter. Studies using extra-narrow-diameter implants (2.8 mm) are scarce. Case Presentation: A 59-year-old male patient received two extra-narrow-diameter implants, 2.8 × 11 mm in the region between elements 11 and 14. Together, two 3.5 × 8.5 mm SYSTHEX®platform 4.1 implants were installed in the region of elements 15 and 16 to provide greater stability in the occlusion. Of four previous implants on the maxillary left side, one in the region between the elements 23 and 24 that was located in a very apical position and vestibularized was removed. The provisional was already installed on the elements 11, 21, and 22 with the metal cores already prepared and with the Globteck®implants in the region of the elements 23, 24, and 27. The functional and esthetic results were satisfactory. Conclusions: Insertion of extra-narrow-diameter implants of 2.8 mm in the maxillary anterior region is a reliable option in a patient with absence of elements 12 and 13, restoring masticatory function and aesthetics in the upper arch.

关键词： Dental Implants Narrow-Diameter Maxilla Bone Density

Ultrastructural Characterization of the Titanium Surface Degree IV in Dental Implant Aluminum Free (Acid Attack)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Biomaterials and Nanobiotechnology 2020年第3期11卷 151-160页

作者： Igor da Silva Brum Marco Antônio Alencar De carvalho Paulo Gonçalo Pinto Dos Santos Renan Lana Devita jorge Luiz da Silva Pires jorge José de carvalho Department of Implantology Faculty of Dentistry State University of Rio de Janeiro Rio de Janeiro Brazil Department of Orthodontic Faculty of Dentistry State University Barcelona Barcelona Spain Department of Biology Faculty of Dentistry State University of Rio de Janeiro Rio de Janeiro Brazil

Following the worldwide trend of developing heavy metal free materials, dental implants aren’t out of this tendency. Over the years, a number of techniques to condition the surface of dental implants have been designed and used such as oxide blasting, however the scientific medical community has been concerned about the use of these heavy metals which leads us to investigate and develop new conditioning techniques. The aim of the study was the analysis of the Systhex® implant surface in automatic system for the treatment of the surface with acid, where we can identify the surfaces purity level, pore size, deepness and especially the roughness proportionated by the technology of acid conditioning on the titanium surfaces of degree IV dental implants. We conclude that the automatic conditioning of acid attack promoted cleanliness, homogeneity and ideal roughness for the osseointegration process.

关键词： Dental Implant Implant Stability Nanotechnology Surface

Crohn's disease in one mixed-race population in Brazil

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2007年第33期13卷 4489-4492页

作者： Genoile Oliveira Santana Luiz Guilherme Costa Lyra Tamara Celi Almeida Santana Lidiane Bianca dos Reis jorge carvalho Guedes Maria Betania Toralles André Castro Lyra Gastrohepatology Unit Federal University of Bahia Brazil Gastrohepatology Unit Hospital San Rafael BahiaBrazil Gastrohepatology Unit Federal University of Bahia Brazil Department of Medicine Federal University of Bahia Brazil Gastrohepatology Unit Hospital San Rafael BahiaBrazil Department of Medicine Federal University of Bahia Brazil Gastrohepatology Unit Federal University of Bahia Brazil Department of Medicine Federal University of Bahia Brazil Genetic Unit Federal University of Bahia Brazil

AIM： To evaluate the classification and severity of Crohn＇s disease in different racial groups. METHODS： Patients with Crohn＇s disease from the outpatient clinic of the University Hospital Prof. Edgard Santos were enrolled in the study. This hospital is a reference centre for inflammatory bowel disease. Race was determined using self-identification. The Vienna＇s classification was applied for all subjects. The severity of Crohn＇s disease was determined according to the number of surgical procedures, hospital admissions in the last year and treatment with steroids and immunosuppressors. Statistical analysis was calculated using t test for means,χ^2 or F for proportions. A P value 〈 0.05 was considered to be significant. RESULTS： Sixty-five patients were enrolled. Non-white patients were more frequently diagnosed with Crohn＇s disease in the age less than 40 years than white patients. The behaviour of disease was similar in both groups with a high frequency of the penetrating form. There was a tendency for non-white patients to have a greater frequency of hospital admissions in the last year compared to white subjects. Non-whites also had a higher rate of colonic and upper gastrointestinal involvement, and were also more frequently on treatment with immunossupressors than white patients although this difference was not statistically significant. CONCLUSION： Non-white patients with Crohn＇s disease had an earlier diagnosis and appeared to have had a more severe disease Dresentation than white patients.

关键词： Racial group Brazil Race Inflammatory bowel disease Crohn's disease

Complete Achilles Tenotomy:A New Improved Experimental Surgical Technique in Rats

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Animal Sciences 2018年第1期8卷 1-11页

作者： Kelly Biancardini Gomes Barbato Guilherme de Almeida Joao da Costa Libardo Rodriguez Clara Raposo Hanna Dias Renata Paiva Liszt Palmeira de Oliveira jorge carvalho Clinical and Experimental Pathophysiology Postgraduate Program School of MedicineState University of Rio de JaneiroRio de JaneiroBrazil Department of Surgical Specialties School of MedicineState University of Rio de JaneiroRio de JaneiroBrazil School of Medicine State University of Rio de JaneiroRio de JaneiroBrazil Department of Histology and Embriology Roberto Alcantara Gomes Institute of BiologyState University of Rio de JaneiroRio de JaneiroBrazil

Rupture of the Achilles tendon is one of the most frequent tendon injuries in humans. However, there is no standard surgical technique thus far to reproduce complete rupture of this tendon in rats. Surgical procedures were performed in Wistar rats under light microscopy, with posterior longitudinal incision and preservation of the plantaris tendon. The animals were sacrificed on 2nd and 8th postoperative week and we used hematoxilin and eosin, picrosirius-red and Weigert’s resorcin-fuchsin to observe general tendon healing. The mean operative time was one minute and 24 seconds. Histological studies showed cellular proliferation and fibrillogenesis at two weeks, with decreased amounts of cellularity and elastic fibers at the 8th week, besides changes in structural organization of collagen fibers. The complete Achilles tenotomy in rats, was improved under light microscopy and sparing the plantaris tendon. This surgical technique was simple and quick, showed signs of normal healing process, could be easily reproducible, and triggered translational researches in this area.

关键词： Achilles Tendon Rupture Animal Experimentation Wound Healing Collagen Elastic Tissue

Benefits of the Combined Use of NSAID and Early Exercise on Tendon Healing in a Murine Model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Animal Sciences 2018年第4期8卷 357-369页

作者： Kelly Biancardini Gomes Barbato Clara Raposo Hanna Dias Renata Paiva Joao da Costa Libardo Rodriguez Guilherme de Almeida Oscar Rocha-Barbosa Liszt Palmeira de Oliveira jorge carvalho School of Medicine State University of Rio de JaneiroRio de JaneiroBrazil Department of Surgical Specialties School of MedicineState University of Rio de JaneiroRio de JaneiroBrazil Department of Zoology Roberto Alcantara Gomes Institute of BiologyState University of Rio de JaneiroRio de JaneiroBrazil Department of Histology and Embriology Roberto Alcantara Gomes Institute of BiologyState University of Rio de JaneiroRio de JaneiroBrazil

Achilles tendon rupture is one of the most frequent tendon injuries. The aim of this experimental study was to evaluate the effect of a non-steroidal anti-inflammatory drug (NSAID) and of aerobic exercise, in an isolated fashion and combined, on cell proliferation and on the biomechanical aspects of the Achilles tendon during healing process after a complete tenotomy in 156 male Wistar rats. Half of the animals received an intra-muscular injection of tenoxicam for 7 days and exercise was initiated on the 8th day for half the animals of each group. Animals were sacrificed at 1, 2, 4 and 8 weeks after the tenotomy and cell proliferation was evaluated by immunohistochemistry for PCNA, biomechanical evaluation was performed with ultimate load and gait cycle analysis was also carried out. Animals were divided into four treatment groups: A) no NSAID and no exercise (control group);B) NSAID plus exercise;C) no NSAID, with exercise;D) NSAID and no exercise. We used the test of two-way analysis of variance with equal cells number, Kruskal-Wallis test and also, Bonferroni method, in the R Project program 3.5.0. The highest intensity of PCNA immunostaining was found at 2 weeks in all groups except for group A (control) that had the highest intensity at 1 week. Animals submitted to exercise had significantly higher (P = 0.02) ultimate loads when compared to animals that were not submitted to exercise at 8 weeks after injury. The animals that received NSAID presented with a more stable gait cycle than the animals that did not receive NSAID. Aerobic exercise, initiated early after a complete Achilles tendon tenotomy, was beneficial to the biomechanical aspects of the tendon that occur during tendon regeneration and the combined use of NSAID improved the gait’s characteristics which could be protective against re-ruptures.

关键词： Achilles Tendon Rupture Experimental Study Non-Steroidal Anti-Inflammatory Drug Aerobic Exercise PCNA Biomechanics

Evidence-Based Complementary and Alternative Medicine Effects of Capybara Oil on Cardiac Remodeling of C57bl/6 Mice

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Biosciences and Medicines 2024年第5期12卷 213-232页

作者： Rafael M. Almeida Wagner D. Giannetti Guilherme R. Silveira Carolina R. Castilho Renata V. Lisboa Bianca T. Ciambarella Rodrigo N. Ferreira jorge José de carvalho Laboratory of Ultrastructure and Tissue Biology Institute of Biology State University of Rio de Janeiro Rio de Janeiro Brazil Higher Education Center of Valenç a Dom Andr&#233 Arcoverde Educational Foundation Valen&#231a Brazil

Cardiovascular diseases are the main cause of morbidity and mortality in the world, and obesity and the metabolic syndrome are risk factors for its development. One of the therapies to reduce cardiovascular risk is the use of polyunsaturated fatty acids. In Brazil, a source of such acid is the oil extracted from the fat of the capybara. The objective of this work is to study the effects of the capybara oil on lipid and glucose metabolism, as well as its effects on the adipose tissue and cardiac remodeling. We assessed the effects of capybara oil treatment on body mass, lipid and carbohydrate metabolism, systolic blood pressure, adipose tissue and cardiac remodeling, and performed an ultrastructural evaluation of the myocardium in C57Bl/6 mice treated with high-fat diet. Treatment with capybara oil reduced total cholesterol and triglyceride levels, systolic blood pressure, visceral and subcutaneous adipose tissue, and adipocyte diameter. In addition, cardiac remodeling was attenuated, preserving cardiomyocytes, increasing vascularization, reducing cardiomyocyte hypertrophy and the extracellular matrix, and preserving the morphological integrity of mitochondria. Capybara oil has several beneficial effects on the cardiovascular and metabolic system, and further studies are needed to better understand its role in the prevention or treatment of cardiovascular diseases.

关键词： Capybara Oil Cardiac Remodeling Polyunsaturated Fatty Acids Obesity Metabolic Syndrome

Contribution of mechanical forces to structural synaptic plasticity:insights from 3D cellular motility mechanisms

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第7期20卷 1995-1996页

作者： Rita O.Teodoro Mafalda Ribeiro Ramos Lara carvalho iNOVA4Health NOVA Medical School|Faculdade de Ciências MédicasNMS|FCMUniversidade Nova de LisboaLisboaPortugal

Cells,tissues,and organs are constantly subjected to the action of mechanical forces from the extracellular environment-and the nervous system is no ***-intrinsic properties such as membrane lipid composition,abundance of mechanosensors,and cytoskeletal dynamics make cells more or less likely to sense these *** and extrinsic cues are integrated by cells and this combined information determines the rate and dynamics of membrane protrusion growth or retraction(Yamada and Sixt,2019).Cell protrusions are extensions of the plasma membrane that play crucial roles in diverse contexts such as cell migration and neuronal synapse *** the nervous system,neurons are highly dynamic cells that can change the size and number of their pre-and postsynaptic elements(called synaptic boutons and dendritic spines,respectively),in response to changes in the levels of synaptic activity through a process called *** plasticity is a hallmark of the nervous system and is present throughout our lives,being required for functions like memory formation or the learning of new motor skills(Minegishi et al.,2023;Pillai and Franze,2024).

关键词： plasticity structural mechanisms

Hydrometallurgical processing of chalcopyrite:A review of leaching techniques

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第12期31卷 2537-2555页

作者： Darwin Michell Cheje Machaca Amilton Barbosa Botelho Junior Thamyres Cardoso de carvalho jorge Alberto Soares Tenório Denise Crocce Romano Espinosa Department of Chemical Engineering University of Sao PauloSão PauloBrazil

Copper,an essential metal for the energy transition,is primarily obtained from chalcopyrite through hydrometallurgical and pyrometallurgical *** risks and harmful impacts of these processes pose significant concerns for environmental and human safety,highlighting the need for more efficient and eco-friendly hydrometallurgical *** review article emphasizes current pro-cesses such as oxidative leaching,bioleaching,and pressure leaching that have demonstrated efficiency in overcoming the complicated chalcopyrite *** leaching operates under benign conditions within the leaching media;nevertheless,the introduction of oxidizing agents provides benefits and ***,a non-aggressive method,has shown a gradual increase in copper extrac-tion efficiency and has been explored using both primary and secondary *** leaching,known for its effectiveness and se-lectivity in copper extraction,is becoming commercially more viable with increased research *** research also provides im-portant data for advancing future research in the field.

关键词： chalcopyrite leaching bioleaching ionic liquids chloride hydrogen peroxide

Laser texturing of piston ring for tribological performance improvement

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Friction 2023年第10期11卷 1895-1905页

作者： Rita FERREIRA Óscar carvalho Luís SOBRAL Sandra carvalho Filipe SILVA CMEMS-UMinho University of MinhoGuimarães 4800058Portugal LABBELS-Associate Laboratory Guimarães 4800058Portugal CEMMPRE-Center for Mechanical Engineering Materials and ProcessesUniversity of CoimbraRua Luís Reis SantosCoimbra 3030-788Portugal MAHLE Componentes de MotoresS.A.Núcleo Industrial de MurtedeCantanhede 3060-372Portugal

The radial surface coating layer of compression piston rings is used to improve their wear resistance during the internal combustion engine ***,at top dead centers,the friction coefficient of the piston ring–cylinder liner pair is detrimental to the engine’s tribological *** this work,dimples with different texture dimensions and densities were tested in a home-developed *** friction coefficient was measured for all samples,and for those with the best results,their wear resistance was *** texture with an aspect ratio of 0.25 and a density area of 15%reported the best tribological results.

关键词： piston ring surface texture friction wear