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1.
Int J Oral Maxillofac Surg ; 51(8): 1055-1058, 2022 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-35148911

RESUMO

Virtual surgical planning for orthognathic surgery using patient-specific implants (PSI) is usually waferless nowadays. However, without an occlusal wafer, difficulties arise in controlling the accuracy of multi-segment maxillary osteotomies, especially for expansion and rotational movements of each segment. It is technically challenging intraoperatively to manipulate multiple segments to fit into the PSI, as the relatively small bone segments need to be secured into the PSI while simultaneously achieving individual segment movements in all planes and with potential bony interferences with each other. Therefore, the use of a maxillary tooth-supported surgical guide is proposed and described. When the guide is inserted before the PSI, it overcomes difficulties in handling multiple maxillary segments and facilitates achieving maximal positional precision of each individual bone segment. The guide enables multiple smaller segments to behave as one unit with the designated occlusion whilst visualizing bony interferences before PSI plating is commenced. Adding a tooth-borne surgical guide in the form of a wafer and a customized arch bar is a cost-effective method to enhance accuracy in virtually planned multi-segment maxillary surgery. Further investigations are required to validate the accuracy and advantages of using wafers and PSI in multi-segment maxillary and mandibular orthognathic surgeries.


Assuntos
Implantes Dentários , Cirurgia Ortognática , Procedimentos Cirúrgicos Ortognáticos , Humanos , Mandíbula/cirurgia , Maxila/diagnóstico por imagem , Maxila/cirurgia , Procedimentos Cirúrgicos Ortognáticos/métodos , Osteotomia de Le Fort
2.
Int J Oral Maxillofac Surg ; 51(1): 44-53, 2022 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-33865661

RESUMO

Spatial deviations of the temporomandibular joint (TMJ) after oncological mandibular reconstruction are important to the aesthetic and functional rehabilitation. The aim of this study was to clarify whether and how three dimensionally (3D) printed patient-specific surgical plates, and the preservation of the condyle or ramus, affect spatial deviations of the TMJ. A total of 33 patients who underwent mandibular reconstruction via computer-assisted surgery were included. Regarding absolute deviations, patients in the 3D-printed plate group showed smaller TMJ deviations compared to those in the conventional plate group. There was no difference in absolute deviations of the TMJ regardless of whether the condyle or ramus was preserved. Regarding physiological deviations, the impact on the contralateral TMJ was smaller in the 3D-printed plate group. Patients with both the condyle and ramus removed had significantly higher deviations of the condyle and joint space. In summary, 3D-printed patient-specific surgical plates improved the spatial accuracy of the TMJ. Under physiological conditions, TMJ deviations on the operated side were mainly affected by the preservation of the condyle. Removal of both the condyle and ramus caused more severe spatial interference to the TMJ; this should be further confirmed.


Assuntos
Reconstrução Mandibular , Cirurgia Assistida por Computador , Placas Ósseas , Estética Dentária , Humanos , Côndilo Mandibular , Articulação Temporomandibular
3.
Int J Oral Maxillofac Surg ; 50(7): 933-939, 2021 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-33168369

RESUMO

The sagittal split ramus osteotomy (SSRO) and intraoral vertical ramus osteotomy (IVRO) are two common orthognathic procedures for the treatment of mandibular prognathism. This randomized clinical trial compared the surgical morbidities between SSRO and IVRO for patients with mandibular prognathism over the first 2 years postoperative. Ninety-eight patients (40 male, 58 female) with a mean age of 24.4±3.5 years underwent bilateral SSRO (98 sides) or IVRO (98 sides) as part or all of their orthognathic surgery. IVRO presented less short-term and long-term surgical morbidity in general. The SSRO group had a greater incidence of inferior alveolar nerve deficit at all follow-up time points (P< 0.01). There was more TMJ pain at 6 weeks (P= 0.047) and 3 months (P= 0.001) postoperative in the SSRO group. The SSRO group also presented more minor complications, which were related to titanium plate exposure and infection. There were no major complications for either technique in this study. Despite the need for intermaxillary fixation, IVRO appears to be associated with less surgical morbidity than SSRO when performed as a mandibular setback procedure to treat mandibular prognathism.


Assuntos
Má Oclusão Classe III de Angle , Prognatismo , Adulto , Feminino , Humanos , Masculino , Mandíbula/cirurgia , Osteotomia Mandibular , Morbidade , Osteotomia Sagital do Ramo Mandibular , Prognatismo/cirurgia , Adulto Jovem
4.
Clin Radiol ; 75(11): 879.e1-879.e6, 2020 11.
Artigo em Inglês | MEDLINE | ID: mdl-32727657

RESUMO

AIM: To evaluate the technical feasibility and safety of percutaneous recanalisation of benign postoperative hepaticojejunostomy strictures using the reverse end of a microwire. MATERIALS AND METHODS: Twenty-one patients with benign postoperative hepaticojejunostomy strictures that had failed to recanalise following management with conventional percutaneous techniques from January 2012 to March 2019 were included in the study. The stricture was punctured by the reverse end of a microwire. Subsequently, serial balloon dilatation and covered stent placement was performed. Technical as well as clinical success, complications, and patency of the hepaticojejunostomy were evaluated. RESULTS: Technical success was achieved in 19 of 21 (90.5%) patients. The mean number of treatment sessions was 1.2 (range, 1-2). The obstructive symptoms were resolved within 3 days after the procedure in 19 patients (100%). There were no major complications. The 1-year and 3-year patency rates were 76.9% and 61.5%, respectively. CONCLUSION: Percutaneous recanalisation using the reverse end of a microwire is technically feasible and safe in the treatment of benign postoperative hepaticojejunostomy strictures. This technique is useful when the conventional percutaneous technique cannot be used to cross the stricture.


Assuntos
Constrição Patológica/etiologia , Doenças do Jejuno/etiologia , Jejuno/diagnóstico por imagem , Jejuno/cirurgia , Hepatopatias/etiologia , Fígado/cirurgia , Pâncreas/cirurgia , Adulto , Idoso , Idoso de 80 Anos ou mais , Procedimentos Cirúrgicos do Sistema Biliar/efeitos adversos , Constrição Patológica/diagnóstico por imagem , Constrição Patológica/cirurgia , Feminino , Humanos , Doenças do Jejuno/diagnóstico por imagem , Doenças do Jejuno/cirurgia , Fígado/diagnóstico por imagem , Hepatopatias/diagnóstico por imagem , Hepatopatias/cirurgia , Imageamento por Ressonância Magnética , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Tomografia Computadorizada por Raios X
5.
Clin Microbiol Infect ; 26(11): 1495-1500, 2020 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-32062049

RESUMO

OBJECTIVES: To evaluate the effect of timing and appropriateness of antibiotics administration on mortality in patients diagnosed with sepsis according to the Sepsis-3 definition. METHODS: This prospective cohort study was conducted in patients diagnosed with sepsis according to the Sepsis-3 definition at the emergency department of Korea University Ansan Hospital from January 2016 to January 2019. The time to antibiotics was defined as the time in hours from emergency department arrival to the first antibiotic administration. Cox proportional hazards regression analysis was used to estimate the association between time to antibiotics and 7-, 14- and 28-day mortality. RESULTS: Of 482 patients enrolled onto this study, 203 (42.1%) of 482 and 312 (64.7%) of 482 were diagnosed with septic shock and high-grade infection respectively. The median time to receipt of antibiotic therapy was 115 minutes. Antibiotics were administered within 3 and 6 hours in 340 (70.4%) of 482 and 450 (93.2%) of 482 patients respectively. Initial appropriate empirical antibiotics were administered in 375 (77.8%) of 482 patients. The time to and appropriateness of the initial antibiotics were not associated with 7-, 14- and 28-day mortality in multivariate analysis. The Sequential Organ Failure Assessment (SOFA) score (adjusted hazard ratio (aHR) 1.229, 95% confidence interval (CI) 1.093-1.381, p 0.001) and initial lactate levels (aHR 1.128, 95% CI 1.034-1.230, p 0.007), Charlson comorbidity index (aHR 1.115, 95% CI 1.027-1.210, p 0.014), 2-hour lactate level (aHR 1.115, 95% CI 1.027-1.210, p 0.009) and SOFA score (aHR 1.077, 95% CI 1.013-1.144, p 0.018) affected 7-, 14- and 28-day mortality respectively. Subgroup analysis with septic shock, bacteraemia and high-grade infection did not affect mortality rates. CONCLUSIONS: Time to receipt of antibiotics may not affect the prognosis of patients with sepsis if a rapid and well-trained resuscitation is combined with appropriate antibiotic administration within a reasonable time.


Assuntos
Antibacterianos/administração & dosagem , Bacteriemia/tratamento farmacológico , Choque Séptico/tratamento farmacológico , Idoso , Antibacterianos/uso terapêutico , Bacteriemia/metabolismo , Feminino , Humanos , Ácido Láctico/análise , Masculino , Pessoa de Meia-Idade , Mortalidade , Análise Multivariada , Escores de Disfunção Orgânica , Prognóstico , Estudos Prospectivos , Choque Séptico/metabolismo , Choque Séptico/mortalidade , Fatores de Tempo , Tempo para o Tratamento
6.
Int J Oral Maxillofac Surg ; 49(8): 1016-1019, 2020 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-31892445

RESUMO

Segmental mandibular defects require reconstruction. The fibula flap serves as a versatile flap in restoring mandibular contour and bony height. With the advances in computer-aided design and additive manufacturing technology, an innovative "one-piece" patient-specific reconstruction plate to facilitate double-barrel fibula flap shaping and bone securing was developed; the plate is described in this study. The "one-piece" plate is fabricated with individualized specifications and is mainly composed of three components: the long-bar reconstruction plate, a short-bar plate, and connecting bars. Our initial experiences showed that mandibular reconstructive surgery was greatly facilitated by the "one-piece" reconstruction plate for double-barrel fibula flap reconstruction and achieved satisfactory outcomes. A well-designed clinical trial is required to confirm the superiority of the "one-piece" reconstruction plate in the future. ClinicalTrials.gov registration: NCT03057223.


Assuntos
Retalhos de Tecido Biológico , Reconstrução Mandibular , Cirurgia Assistida por Computador , Transplante Ósseo , Desenho Assistido por Computador , Fíbula , Humanos , Mandíbula/cirurgia
7.
Int J Oral Maxillofac Surg ; 49(1): 13-21, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31230767

RESUMO

Three-dimensionally (3D) printed patient-specific surgical plates have been proposed to facilitate mandibular reconstruction and are attracting extensive attention. We have recently reported the high accuracy of 3D-printed patient-specific surgical plates used in head and neck reconstruction. Based on this previous work, the current study proposes a novel 'surgeon-dominated' approach to the design of 3D-printed patient-specific surgical plates. The aim of this proof-of-concept study was to explore the workflow and technical procedures of the surgeon-dominated approach. The workflow includes virtual surgery, the design and printing of patient-specific surgical devices, and real surgery. The prototype of the patient-specific surgical plate was designed by surgeons and further optimized for 3D printing by engineers. Different types of mandibular defect were tested to confirm the wide applicability of this approach. Cases in which this approach was used were reviewed and the duration of time spent on each case studied. Based on a total of 16 patients, the time spent on virtual surgery and plate design was 18.83±13.19hours, and the time taken for 3D printing, post-processing, and product delivery was 162.9±55.15hours. Therefore, this novel surgeon-dominated approach is feasible and time-saving, which would likely promote the wide application of patient-specific surgical plates and lead to a new era of 'digitization and precision' in mandibular reconstruction. ClinicalTrials.gov registration: NCT03057223.


Assuntos
Reconstrução Mandibular , Cirurgiões , Cirurgia Assistida por Computador , Placas Ósseas , Desenho Assistido por Computador , Humanos , Mandíbula , Impressão Tridimensional
8.
Nanotechnology ; 30(37): 374001, 2019 Sep 13.
Artigo em Inglês | MEDLINE | ID: mdl-31181544

RESUMO

A SrRuO3 thin film has been widely used as a metal electrode in electronic devices based on transition metal oxides, and hence it is important to understand its thermal transport properties to minimize a thermal degradation problem during the device operation. Using the time-domain thermoreflectance measurement technique, we investigate the cross-plane thermal conductivity of the SrRuO3 thin films with a thickness variation from 1 µm to 8 nm. We find that the thermal conductivity is reduced from about 6 W m-1 K-1 for the 1 µm thick film to about 1.2 W m-1 K-1 for the 8 nm thick film, and attribute this behavior to the boundary scattering of thermal carriers which originally have the mean free path of about 20 nm in a bulk state. Also, we observe a clear dip behavior of the thermal conductivity in the intermediate thickness around 30 nm which suggests an existence of a strong scattering source other than the film boundary. We explain this result by considering an additional interfacial scattering at the tetragonal-orthorhombic phase boundary which is formed during the strain relaxation with an increase of the film thickness.

9.
Int J Oral Maxillofac Surg ; 48(10): 1300-1306, 2019 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-31084977

RESUMO

Ameloblastoma is a benign odontogenic tumour showing locally aggressive characteristics. This retrospective study was performed to investigate the long-term treatment outcomes of ameloblastoma and to evaluate the risk factors for recurrence. The study was conducted in the Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, the University of Hong Kong and covered the years 1990-2017. Patient demographic data, radiographic pattern and findings, clinical findings, tumour site and size, World Health Organization classification, treatment modality, histological pattern, duration of follow-up, and timing of recurrence were recorded and analyzed. The potential risk factors were analyzed by Kaplan-Meier and Cox regression tests. The cases of a total of 128 patients were reviewed; 65 were male and 63 were female. The mean follow-up period was 117 months. The 5-, 10-, and 15-year recurrence rates were 9.3%, 17.6%, and 24.4%, respectively. Kaplan-Meier and Cox regression tests showed that recurrence was significantly associated with radiographic pattern, tumour size, and treatment modality. Multiple regression analysis for these three variables demonstrated that treatment modality was the only independent prognostic factor for recurrence. This study showed that radical resection is the only significant factor for a low recurrence rate of ameloblastoma and patients require long-term follow-up for late-onset recurrence.


Assuntos
Ameloblastoma , Feminino , Seguimentos , Humanos , Masculino , Recidiva Local de Neoplasia , Estudos Retrospectivos , Fatores de Risco
10.
Opt Express ; 27(5): 6832-6841, 2019 Mar 04.
Artigo em Inglês | MEDLINE | ID: mdl-30876260

RESUMO

We report the transfer printing of GaN-based microscale vertical-type light-emitting diodes (µ-VLEDs) using a functional layer and a biomimetic stamp. An oxide-based functional layer is inserted onto the structure of a µ-VLED and used to separate the chip from the µ-VLED wafer by absorbing the pulse of a UV pulse laser during pick-up of the transfer printing process. Polydimethylsiloxane (PDMS)-based biomimetic stamps have been fabricated to mimic the gecko lizard cilia for improved adhesion and repeatability. The biomimetic stamp has an adhesion force of 25.6 N/cm2, which is 12 times the adhesion of a flat stamp; an adhesion force of 10 N/cm2 or more was maintained after 100,000 repeated adhesion tests. A flexible 10 × 10 prototype array on a polyimide substrate was fabricated, and its bending test results indicated that the strain effect on the forward voltage and the output power was less than 1%. The stable bending test results of the prototype indicate that µ-VLEDs using biomimetic stamps allow the necessary stability for practical transfer printing.

11.
Nutr Metab Cardiovasc Dis ; 28(11): 1106-1113, 2018 11.
Artigo em Inglês | MEDLINE | ID: mdl-30287123

RESUMO

BACKGROUNDS AND AIMS: We aimed to reveal the association between subclinical inflammation and metabolic risk factors and to determine the difference in the association between normal-weight and obese Korean individuals. METHODS AND RESULTS: Data collected from the Korean National Health and Nutrition Examination Survey (KNHANES) 2015, conducted from January to December 2015, were analyzed. Overall, 4620 subjects were examined and divided into two subgroups: 2987 and 1633 subjects in the normal-weight and obese groups, respectively. The prevalence of obesity in the study population was 34.5% (n = 1633). After multivariate adjustment, impaired fasting glucose (IFG) (odds ratio [OR] 1.22, 95% confidence interval [CI] 1.05-1.42, P = 0.010), high triglyceride (TG) levels (OR 1.29, 95% CI 1.13-1.47, P < 0.001), and low high-density lipoprotein-cholesterol (HDL-C) levels (OR 1.47, 95% CI 1.31-1.64, P < 0.001) were significantly associated with increased high-sensitivity C-reactive protein (hs-CRP) levels in the normal-weight group but not in the obesity group. CONCLUSION: Subclinical inflammation was associated with IFG, high TG levels, and low HDL-C levels in normal-weight Korean individuals. Prospective and biochemical research is necessary to clarify the role of subclinical systemic inflammation in individuals with normal body weight and its impact on insulin resistance and abnormal lipid metabolism, which promote the incidence of metabolic syndrome and cardiovascular disease.


Assuntos
Dislipidemias/epidemiologia , Transtornos do Metabolismo de Glucose/epidemiologia , Inflamação/epidemiologia , Doenças Assintomáticas , Biomarcadores/sangue , Glicemia/metabolismo , Proteína C-Reativa/análise , HDL-Colesterol/sangue , Estudos Transversais , Dislipidemias/sangue , Dislipidemias/diagnóstico , Feminino , Transtornos do Metabolismo de Glucose/sangue , Transtornos do Metabolismo de Glucose/diagnóstico , Humanos , Inflamação/sangue , Inflamação/diagnóstico , Mediadores da Inflamação/sangue , Resistência à Insulina , Masculino , Pessoa de Meia-Idade , Inquéritos Nutricionais , Obesidade/diagnóstico , Obesidade/epidemiologia , Prevalência , República da Coreia/epidemiologia , Fatores de Risco , Triglicerídeos/sangue
12.
Health Educ Care ; 3(1): 1-4, 2018 May 14.
Artigo em Inglês | MEDLINE | ID: mdl-34095515

RESUMO

American Indians (AI) have the highest smoking rates and lowest quit rates of any racial/ethnic group in the U.S. Researchers and community members from the American Indian Health Research and Education Alliance (AIHREA) created and evaluated a culturally-tailored smoking cessation program, All Nations Breath of Life (ANBL) as a recruitment tool for smoking cessation programs among AI. To increase enrollment in ANBL, AI smokers were approached at cultural events and asked to attend a 30-minute educational session (in-person, n= 179; tele-video, n=97). Tele-video (30%) and in-person (9%) session participants were recruited into ANBL. Pre- and post-tests showed participants in both sessions demonstrated increased motivation and confidence to quit smoking but significant differences were present in both sessions (p < 0.0001). Results indicate that theoretically guided and culturally tailored education sessions are viable approaches to educate and recruit underserved populations into programs that promote smoking cessation.

13.
J Hand Surg Eur Vol ; 42(3): 240-245, 2017 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-27920391

RESUMO

We analysed scaphoid deformity as a result of surgical treatment of scaphoid fracture nonunion and assessed the deformity associated with a dorsal intercalated segmental instability pattern of carpal malalignment. A total of 45 patients who were treated for scaphoid fracture nonunion were included in the study. The height-to-length ratio of the scaphoid was measured on computed tomographic images and used to assess scaphoid deformity. Carpal malalignment was quantified based on the radio-lunate angle. A correlation analysis between the height-to-length ratio and the radio-lunate angle was performed. Dorsal intercalated segmental instability was defined as a radio-lunate angle >15°, and a receiver operating curve analysis was used to calculate the cutoff height-to-length ratio that can be accompanied with dorsal intercalated segmental instability. Extension of the lunate increases in proportion to the flexion deformity of the scaphoid; dorsal intercalated segmental instability can occur if the height-to-length ratio of the scaphoid is >0.73. LEVEL OF EVIDENCE: IV.


Assuntos
Articulações do Carpo , Fraturas não Consolidadas/cirurgia , Instabilidade Articular/etiologia , Osso Escafoide/lesões , Osso Escafoide/cirurgia , Adolescente , Adulto , Idoso , Estudos de Coortes , Feminino , Fraturas não Consolidadas/diagnóstico por imagem , Humanos , Masculino , Pessoa de Meia-Idade , Osso Escafoide/diagnóstico por imagem , Tomografia Computadorizada por Raios X , Adulto Jovem
14.
Osteoarthritis Cartilage ; 25(3): 401-405, 2017 03.
Artigo em Inglês | MEDLINE | ID: mdl-27477830

RESUMO

OBJECTIVE: Lipocalin-2 (LCN2) is a recently characterized adipokine that is upregulated in chondrocytes treated with pro-inflammatory mediators and in the synovial fluid of osteoarthritis (OA) patients. Here, we explored the in vivo functions of LCN2 in OA cartilage destruction in mice. METHODS: The expression levels of LCN2 were determined at the mRNA and protein levels in primary cultured mouse chondrocytes and in human and mouse OA cartilage. Experimental OA was induced in wild-type (WT) or Lcn2-knockout (KO) mice by destabilization of the medial meniscus (DMM) or intra-articular (IA) injection of adenoviruses expressing hypoxia-inducible factor (HIF)-2α (Ad-Epas1), ZIP8 (Ad-Zip8), or LCN2 (Ad-Lcn2). The effect of LCN2 overexpression on the cartilage of WT mice was examined by IA injection of Ad-Lcn2. RESULTS: LCN2 mRNA levels in chondrocytes were markedly increased by the pro-inflammatory cytokines, interleukin (IL)-1ß and tumor necrosis factor-α (TNF-α), and by previously identified catabolic regulators of OA, such as HIF-2α and components of the zinc-ZIP8-MTF1 axis. LCN2 protein levels were also markedly increased in human OA cartilage and cartilage from various experimental mouse models of OA. However, overexpression of LCN2 in chondrocytes did not modulate the expression of cartilage matrix molecules or matrix-degrading enzymes. Furthermore, LCN2 overexpression in mouse cartilage via IA injection of Ad-Lcn2 did not cause OA pathogenesis, and Lcn2 KO mice showed no alteration in DMM-induced OA cartilage destruction. CONCLUSIONS: Our observations collectively suggest that upregulation of LCN2 in OA cartilage is not sufficient or necessary for OA cartilage destruction in mice.


Assuntos
Cartilagem/metabolismo , Lipocalina-2/metabolismo , Osteoartrite/metabolismo , Animais , Cartilagem/patologia , Condrócitos/metabolismo , Humanos , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Knockout , Osteoartrite/patologia , Regulação para Cima
15.
J Nanosci Nanotechnol ; 16(5): 5295-7, 2016 May.
Artigo em Inglês | MEDLINE | ID: mdl-27483918

RESUMO

In this study, diamond films were prepared using the microwave plasma-enhanced chemical vapor deposition (PECVD) system, which included a DC bias system to enhance the nucleation of the films. The films were synthesized on Si wafers with different ratios of methane (CH4) and hydrogen (H2) gases. We have studied the effects of the CH4-to-H2 ratio on the structural and optical properties of diamond films. The thickness and surface profile of the films were characterized via field emission scanning electron microscopy (FE-SEM). Raman was used to investigate the structural properties of the diamond films. The refractive indexes as functions of the CH4-to-H2 ratio were measured using an ellipsometer. The FE-SEM analysis showed that the 3 and 5 sccm CH4 created diamond films. The Raman analysis indicated that a nanocrystalline diamond film was formed at 3 sccm; a general diamond film, at 5 sccm; and films similar to the a-C:H film, at 7 sccm. The ellipsometer measurement showed that the refractive index of the synthesized diamond film was around 2.42 at 3 sccm. This value decreased as the CH4 volume increased.

16.
J Nanosci Nanotechnol ; 16(5): 5302-4, 2016 May.
Artigo em Inglês | MEDLINE | ID: mdl-27483920

RESUMO

This research investigates plasma-treated and metal-coated carbon nanowalls (CNWs) for use as counter electrodes of dye-sensitized solar cells (DSSCs). The CNWs were synthesized on a fluorine-tin-oxide (FTO) glass substrate using the microwave plasma-enhanced chemical vapor deposition (PECVD) system with methane (CH4) gas. The post-plasma treatment was performed on the CNWs with hydrogen (H2) plasma using PECVD, and the CNWs were sputter-coated with metal films using the RF magnetron sputtering system with a four-inch tungsten (W) target. Then the post-plasma-treated and metal-coated CNWs were used as counter electrodes for the fabrication of the DSSCs. Field-emission scanning electron microscopy (FE-SEM) was performed to obtain cross-sectional and planar images of the grown CNWs. The energy conversion efficiencies of the DSSCs manufactured using the post-plasma-treated and metal-layer-coated CNWs as the counter electrodes were measured.

17.
Clin Microbiol Infect ; 22(10): 880-886, 2016 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-27475739

RESUMO

Given the mode of transmission of Middle East respiratory syndrome (MERS), healthcare workers (HCWs) in contact with MERS patients are expected to be at risk of MERS infections. We evaluated the prevalence of MERS coronavirus (CoV) immunoglobulin (Ig) G in HCWs exposed to MERS patients and calculated the incidence of MERS-affected cases in HCWs. We enrolled HCWs from hospitals where confirmed MERS patients had visited. Serum was collected 4 to 6 weeks after the last contact with a confirmed MERS patient. We performed an enzyme-linked immunosorbent assay (ELISA) to screen for the presence of MERS-CoV IgG and an indirect immunofluorescence test (IIFT) to confirm MERS-CoV IgG. We used a questionnaire to collect information regarding the exposure. We calculated the incidence of MERS-affected cases by dividing the sum of PCR-confirmed and serology-confirmed cases by the number of exposed HCWs in participating hospitals. In total, 1169 HCWs in 31 hospitals had contact with 114 MERS patients, and among the HCWs, 15 were PCR-confirmed MERS cases in study hospitals. Serologic analysis was performed for 737 participants. ELISA was positive in five participants and borderline for seven. IIFT was positive for two (0.3%) of these 12 participants. Among the participants who did not use appropriate personal protective equipment (PPE), seropositivity was 0.7% (2/294) compared to 0% (0/443) in cases with appropriate PPE use. The incidence of MERS infection in HCWs was 1.5% (17/1169). The seroprevalence of MERS-CoV IgG among HCWs was higher among participants who did not use appropriate PPE.


Assuntos
Infecções por Coronavirus/epidemiologia , Transmissão de Doença Infecciosa do Paciente para o Profissional/estatística & dados numéricos , Coronavírus da Síndrome Respiratória do Oriente Médio/imunologia , Adolescente , Adulto , Idoso , Infecções por Coronavirus/imunologia , Feminino , Pessoal de Saúde , Inquéritos Epidemiológicos , Humanos , Incidência , Masculino , Pessoa de Meia-Idade , Vigilância da População , Estudos Soroepidemiológicos , Adulto Jovem
18.
J Nanosci Nanotechnol ; 16(2): 1541-4, 2016 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-27433617

RESUMO

Titanium as one kind of biomaterials comes in direct contact with the body, making evaluation of biocompatibility an important aspect to biomaterials development. Surface chemistry of titanium plays an important role in osseointegration. Different surface modification alters the surface chemistry and result in different biological response. In this study, three kinds of mixed acid solutions were used to treat Ti specimens to induce Ca-P formation. Following a strong mixed acid activation process, Ca-P coating successfully formed on the Ti surfaces in simulated body fluid. Strong mixed acid increased the roughness of the metal surface, because the porous and rough surface allows better adhesion between Ca-P coatings and substrates. After modification of titanium surface by mixed acidic solution and subsequently H2O2/HCL treatment evaluation of biocompatibility was conducted from hydroxyapatite formation by biomimetic process and cell viability on modified titanium surface. Nano-scale modification of titanium surfaces can alter cellular and tissue responses, which may benefit osseointegration and dental implant therapy. Results from this study indicated that surface treatment methods affect the surface morphology, type of TiO2 layer formed and subsequent apatite deposition and biological responses. The thermo scientific alamarblue cell viability assay reagent is used to quantitatively measure the viability of mammalian cell lines, bacteria and fungi by incorporating a rapid, sensitive and reliable fluorometric/colorimetric growth indicator, without any toxic and side effect to cell line. In addition, mixed acid treatment uses a lower temperature and shorter time period than widely used alkali treatment.


Assuntos
Ligas/química , Apatitas/metabolismo , Osteoblastos/metabolismo , Titânio/química , Linhagem Celular , Humanos , Osteoblastos/citologia , Propriedades de Superfície
19.
J Food Sci ; 81(7): E1716-25, 2016 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-27243801

RESUMO

To identify the significant contribution of intermolecular hydrogen bonds of starch molecules to the film structure formation, pH of film-forming solutions was adjusted and also various salts (NaCl, CaCl2 , CaSO4 , and K2 SO4 ) were mixed into the glycerol-plasticized pea starch film. The film made from pH 7 possessed the highest tensile strength-at-break (2 times) and elastic modulus (4 to 15 times) and the lowest elongation-at-break compared with those of the films made from acid and alkali environments. The pH 7 film also has the highest film density and the lowest total soluble matter. At the level of 0.01 to 0.1 M of CaSO4 and 0.1 M of K2 SO4 in a kilogram of starch, the water solubility of the film increased, while chloride salts slightly lowered the solubility. NaCl and CaSO4 reduced water vapor permeability (WVP), while CaCl2 slightly increased WVP at 0.01 and 0.06 M concentrations, and K2 SO4 significantly increased WVP at 0.03 and 0.15 M. Presence of salts increased tensile strength (5 to 14 times than the control films) and elastic modulus (35 to 180 times) of starch film at 0.01 to 0.03 M of CaSO4 and K2 SO4 . Elongation-at-break increased significantly as salt concentration increases to an optimal level. However, when the concentration exceeded above the optimal level, the E of starch films decreased and showed no significant difference from the control film. Overall, the addition of salts modified physical and mechanical properties of pea starch films more than pH adjustment without any salt addition.


Assuntos
Embalagem de Alimentos/métodos , Ervilhas/química , Plastificantes/química , Sais/química , Amido/química , Cloreto de Cálcio/química , Sulfato de Cálcio/química , Módulo de Elasticidade , Glicerol/química , Humanos , Concentração de Íons de Hidrogênio , Permeabilidade , Cloreto de Sódio/química , Solubilidade , Vapor , Sulfatos/química , Resistência à Tração , Água
20.
Int J Clin Pract ; 70(4): 302-11, 2016 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-26997458

RESUMO

AIM: The aim of this study was to assess the effects of ursodeoxycholic acid composite (URSA-S) on fatigue in patients with elevated liver function tests and/or fatty liver disease. METHODS: In this multi-centre randomised double-blinded placebo-controlled trial, 168 adults who were diagnosed with fatigue based on our criteria and had elevated liver function tests (but not > 5 times the normal level) and/or fatty liver on ultrasonography, were randomised to either the placebo or URSA-S administration group. The rate of improvement of checklist individual strength (CIS) using a cut-off of 76 points at the end of the study (8 weeks), the change in fatigue scale [CIS score and visual analogue scale (VAS)] were evaluated. The adverse effects of URSA-S were also recorded. RESULTS: The rate of CIS improvement at the end-point was 79.76% and 45.68% in the therapy and placebo groups, respectively (p < 0.05). The fatigue recovery rate of the CIS score and VAS were higher in the therapy (-25.44 ± 18.57, -27.84 ± 2.70) than in the placebo group (-16.59 ± 17.29, -19.46 ± 2.81) (p < 0.05). The difference in fatigue recovery rate between the therapy and placebo groups was significant after 8 weeks. When analysed separately in patients with abnormal liver function tests and fatty liver disease, the fatigue recovery rate of the CIS score and VAS at 8 weeks was higher in the therapy than in the placebo group (p < 0.05). The frequency of adverse events in the therapy group was not significantly higher than that in the placebo group. CONCLUSION: URSA-S is effective for alleviating fatigue in patients with liver dysfunction and/or fatty liver. The adverse effects of URSA-S are not significant. This study is registered at https://clinicaltrials.gov/ct2/show/NCT02415777.


Assuntos
Fadiga/tratamento farmacológico , Fígado/metabolismo , Hepatopatia Gordurosa não Alcoólica/complicações , Ácido Ursodesoxicólico/uso terapêutico , Adulto , Colagogos e Coleréticos/uso terapêutico , Método Duplo-Cego , Fadiga/etiologia , Fadiga/metabolismo , Feminino , Seguimentos , Humanos , Testes de Função Hepática , Masculino , Pessoa de Meia-Idade , Hepatopatia Gordurosa não Alcoólica/tratamento farmacológico , Hepatopatia Gordurosa não Alcoólica/metabolismo , Estudos Retrospectivos , Resultado do Tratamento
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