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Yang Y, Liu M, Yang Z, Lin WS, Chen L, Tan J. Enhanced Antibacterial Effect on Zirconia Implant Abutment by Silver Linear-Beam Ion Implantation. J Funct Biomater 2023; 14:jfb14010046. [PMID: 36662093 PMCID: PMC9865340 DOI: 10.3390/jfb14010046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2022] [Revised: 12/30/2022] [Accepted: 01/11/2023] [Indexed: 01/15/2023] Open
Abstract
Peri-implant lesions, such as peri-implant mucositis and peri-implantitis, are bacterial-derived diseases that happen around dental implants, compromising the long-term stability and esthetics of implant restoration. Here, we report a surface-modification method on zirconia implant abutment using silver linear-beam ion implantation to reduce the bacterial growth around the implant site, thereby decreasing the prevalence of peri-implant lesions. The surface characteristics of zirconia after ion implantation was evaluated using energy dispersive spectroscopy, X-ray photoelectron spectroscopy, and a contact-angle device. The antibacterial properties of implanted zirconia were evaluated using Streptococcus mutans and Porphyromonas gingivalis. The biocompatibility of the material surface was evaluated using human gingival fibroblasts. Our study shows that the zirconia surface was successfully modified with silver nanoparticles by using the ion-implantation method. The surface modification remained stable, and the silver-ion elution was below 1 ppm after one-month of storage. The modified surface can effectively eliminate bacterial growth, while the normal gingiva's cell growth is not interfered with. The results of the study demonstrate that a silver-ion-implanted zirconia surface possesses good antibacterial properties and good biocompatibility. The surface modification using silver-ion implantation is a promising method for future usage.
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Affiliation(s)
- Yang Yang
- Department of Prosthodontics, Peking University School, Hospital of Stomatology, Beijing 100081, China
- National Center of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing Key Laboratory of Digital Stomatology, Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health, NMPA Key Laboratory for Dental Materials, No. 22, Zhongguancun South Avenue, Haidian District, Beijing 100081, China
| | - Mingyue Liu
- National Center of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing Key Laboratory of Digital Stomatology, Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health, NMPA Key Laboratory for Dental Materials, No. 22, Zhongguancun South Avenue, Haidian District, Beijing 100081, China
- First Clinical Division, Peking University School, Hospital of Stomatology, Beijing 100081, China
| | - Zhen Yang
- Department of Prosthodontics, Peking University School, Hospital of Stomatology, Beijing 100081, China
- National Center of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing Key Laboratory of Digital Stomatology, Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health, NMPA Key Laboratory for Dental Materials, No. 22, Zhongguancun South Avenue, Haidian District, Beijing 100081, China
| | - Wei-Shao Lin
- Department of Prosthodontics, Indiana University School of Dentistry, Indianapolis, IN 46202, USA
| | - Li Chen
- Department of Prosthodontics, Peking University School, Hospital of Stomatology, Beijing 100081, China
- National Center of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing Key Laboratory of Digital Stomatology, Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health, NMPA Key Laboratory for Dental Materials, No. 22, Zhongguancun South Avenue, Haidian District, Beijing 100081, China
- Correspondence:
| | - Jianguo Tan
- Department of Prosthodontics, Peking University School, Hospital of Stomatology, Beijing 100081, China
- National Center of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing Key Laboratory of Digital Stomatology, Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health, NMPA Key Laboratory for Dental Materials, No. 22, Zhongguancun South Avenue, Haidian District, Beijing 100081, China
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Bravo de Luciano G, Panecatl‐Bernal Y, Soto‐Cruz B, Méndez‐Rojas MÁ, López‐Salazar P, Alcántara‐Iniesta S, Portillo MC, Romero‐López A, Mejía‐Silva J, Alvarado J, Domínguez‐Jiménez MÁ. Controlling Size Distribution of Silver Nanoparticles using Natural Reducing Agents in MCM‐41@Ag. ChemistrySelect 2022. [DOI: 10.1002/slct.202202566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- Gerardo‐Miguel Bravo de Luciano
- Centro de Investigación en Dispositivos Semiconductores Instituto de Ciencias Benemérita Universidad Autónoma de Puebla Puebla 72570 Puebla México
| | - Yesmin Panecatl‐Bernal
- División de Ingeniería Industrial Tecnológico Nacional de México Campus Zacatlán Jicolapa 73310 Puebla, México
| | - Blanca‐Susana Soto‐Cruz
- Centro de Investigación en Dispositivos Semiconductores Instituto de Ciencias Benemérita Universidad Autónoma de Puebla Puebla 72570 Puebla México
| | - Miguel Ángel Méndez‐Rojas
- Departmento de Ciencias Químico-Biológicas Universidad de las Américas Puebla ExHda. Sta. Catarina Mártir s/n San Andrés Cholula 72810 Puebla, México
| | - Primavera López‐Salazar
- Centro de Investigación en Dispositivos Semiconductores Instituto de Ciencias Benemérita Universidad Autónoma de Puebla Puebla 72570 Puebla México
| | - Salvador Alcántara‐Iniesta
- Centro de Investigación en Dispositivos Semiconductores Instituto de Ciencias Benemérita Universidad Autónoma de Puebla Puebla 72570 Puebla México
| | - Melissa Chávez Portillo
- División de Ingeniería Industrial Tecnológico Nacional de México Campus Zacatlán Jicolapa 73310 Puebla, México
| | - Anabel Romero‐López
- Instituto de Física “Luis Rivera Terrazas” Benemérita Universidad Autónoma de Puebla Puebla, Ecocampus Valsequillo 72960 San Pedro Zacachimalpa, México
| | | | - Joaquin Alvarado
- Centro de Investigación en Dispositivos Semiconductores Instituto de Ciencias Benemérita Universidad Autónoma de Puebla Puebla 72570 Puebla México
| | - Miguel Ángel Domínguez‐Jiménez
- Centro de Investigación en Dispositivos Semiconductores Instituto de Ciencias Benemérita Universidad Autónoma de Puebla Puebla 72570 Puebla México
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Aceti DM, Filipov E, Angelova L, Sotelo L, Fontanot T, Yousefi P, Christiansen S, Leuchs G, Stanimirov S, Trifonov A, Buchvarov I, Daskalova A. Single-Step Process for Titanium Surface Micro- and Nano-Structuring and In Situ Silver Nanoparticles Formation by Ultra-Short Laser Patterning. MATERIALS 2022; 15:ma15134670. [PMID: 35806794 PMCID: PMC9267125 DOI: 10.3390/ma15134670] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Revised: 06/24/2022] [Accepted: 06/28/2022] [Indexed: 02/05/2023]
Abstract
Ultra-short laser (USL)-induced surface structuring combined with nanoparticles synthesis by multiphoton photoreduction represents a novel single-step approach for commercially pure titanium (cp-Ti) surface enhancement. Such a combination leads to the formation of distinct topographical features covered by nanoparticles. The USL processing of cp-Ti in an aqueous solution of silver nitrate (AgNO3) induces the formation of micron-sized spikes surmounted by silver nanoparticles (AgNPs). The proposed approach combines the structuring and oxidation of the Ti surface and the synthesis of AgNPs in a one-step process, without the use of additional chemicals or a complex apparatus. Such a process is easy to implement, versatile and sustainable compared to alternative methodologies capable of obtaining comparable results. Antimicrobial surfaces on medical devices (e.g., surgical tools or implants), for which titanium is widely used, can be realized due to the simultaneous presence of AgNPs and micro/nano-structured surface topography. The processed surfaces were examined by means of a scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDX), atomic force microscopy (AFM) and Raman spectroscopy. The surface morphology and the oxidation, quality and quantity of AgNPs were analyzed in relation to process parameters (laser scanning speed and AgNO3 concentration), as well as the effect of AgNPs on the Raman signal of Titanium oxide.
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Affiliation(s)
- Dante Maria Aceti
- Institute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria
| | - Emil Filipov
- Institute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria
| | - Liliya Angelova
- Institute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria
| | - Lamborghini Sotelo
- Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstraße 7, 91058 Erlangen, Germany
- Innovations-Institut für Nanotechnologie und Korrelative Mikroskopie gGmbH Äußere Nürnberger Str. 62, 91301 Forchheim, Germany
| | - Tommaso Fontanot
- Fraunhofer Institute for Ceramic Technologies and Systems IKTS Äußere Nürnberger Str. 62, 91301 Forchheim, Germany
| | - Peyman Yousefi
- Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstraße 7, 91058 Erlangen, Germany
- Fraunhofer Institute for Ceramic Technologies and Systems IKTS Äußere Nürnberger Str. 62, 91301 Forchheim, Germany
| | - Silke Christiansen
- Innovations-Institut für Nanotechnologie und Korrelative Mikroskopie gGmbH Äußere Nürnberger Str. 62, 91301 Forchheim, Germany
- Fraunhofer Institute for Ceramic Technologies and Systems IKTS Äußere Nürnberger Str. 62, 91301 Forchheim, Germany
| | - Gerd Leuchs
- Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstraße 7, 91058 Erlangen, Germany
- Max-Planck-Institut für die Physik des Lichts, 91058 Erlangen, Germany
| | - Stanislav Stanimirov
- Faculty of Chemistry and Pharmacy, Sofia University, 1 J. Bourchier Blvd., 1164 Sofia, Bulgaria
| | - Anton Trifonov
- Department of Physics, Sofia University, 5 J. Bourchier Blvd., 1164 Sofia, Bulgaria
| | - Ivan Buchvarov
- Department of Physics, Sofia University, 5 J. Bourchier Blvd., 1164 Sofia, Bulgaria
| | - Albena Daskalova
- Institute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria
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Protective Role of Flavonoids against Intestinal Pro-Inflammatory Effects of Silver Nanoparticles. Molecules 2021; 26:molecules26216610. [PMID: 34771019 PMCID: PMC8588041 DOI: 10.3390/molecules26216610] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 10/25/2021] [Accepted: 10/26/2021] [Indexed: 11/17/2022] Open
Abstract
Silver nanoparticles (AgNP) have been increasingly incorporated into food-related and hygiene products for their unique antimicrobial and preservative properties. The consequent oral exposure may then result in unpredicted harmful effects in the gastrointestinal tract (GIT), which should be considered in the risk assessment and risk management of these materials. In the present study, the toxic effects of polyethyleneimine (PEI)-coated AgNP (4 and 19 nm) were evaluated in GIT-relevant cells (Caco-2 cell line as a model of human intestinal cells, and neutrophils as a model of the intestinal inflammatory response). This study also evaluated the putative protective action of dietary flavonoids against such harmful effects. The obtained results showed that AgNP of 4 and 19 nm effectively induced Caco-2 cell death by apoptosis with concomitant production of nitric oxide, irrespective of the size. It was also observed that AgNP induced human neutrophil oxidative burst. Interestingly, some flavonoids, namely quercetin and quercetagetin, prevented the deleterious effects of AgNP in both cell types. Overall, the data of the present study provide a first insight into the promising protective role of flavonoids against the potentially toxic effects of AgNP at the intestinal level.
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Hadian-Ghazvini S, Dashtestani F, Hakimian F, Ghourchian H. An electrochemical genosensor for differentiation of fully methylated from fully unmethylated states of BMP3 gene. Bioelectrochemistry 2021; 142:107924. [PMID: 34474202 DOI: 10.1016/j.bioelechem.2021.107924] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 07/19/2021] [Accepted: 08/03/2021] [Indexed: 10/20/2022]
Abstract
The methylation state of a part of the BMP3 gene was detected by our genosensor. This epigenetic biomarker is involved in the biomarker panel of the sDNA test, which is an FDA approved test for colorectal cancer screening. In the present genosensor, polyethyleneimine-stabilized silver nanoparticles (PEI-AgNPs) were used as a non-specific nanolabel for signal generation/amplification and lowering the limit of detection. After immobilization of capture probes and mercaptoethanol molecules on the gold electrode, a thermally treated mixture of the BMP3 targets and reporter probes was introduced to the electrode. Because of the specificity of the reporter probes for fully methylated targets, complete sandwich-like complexes are formed only with them. Therefore, such full-length double-stranded hybrids compared to fully unmethylated targets have more negative charges and can more attract positively charged PEI-AgNPs. For discrimination between methylated and unmethylated targets, electroimpedance spectroscopy and cyclic voltammetry were used for electrode modification monitoring and signal measurement. The sharp and narrow anodic peaks of cyclic voltammograms, which resulted from silver oxidation, were utilized for calibration plot analysis. The genosensor showed a linear response for the target concentration range from 1fM to 100 nM, while the detection limit for methylated and unmethylated target discrimination was 1 fM.
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Affiliation(s)
- Samaneh Hadian-Ghazvini
- Laboratory of Bioanalysis, Institute of Biochemistry and Biophysics, University of Tehran, Tehran 1417614335, Iran
| | - Fariba Dashtestani
- Laboratory of Bioanalysis, Institute of Biochemistry and Biophysics, University of Tehran, Tehran 1417614335, Iran
| | - Fatemeh Hakimian
- Laboratory of Bioanalysis, Institute of Biochemistry and Biophysics, University of Tehran, Tehran 1417614335, Iran
| | - Hedayatolah Ghourchian
- Laboratory of Bioanalysis, Institute of Biochemistry and Biophysics, University of Tehran, Tehran 1417614335, Iran.
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Zarzuela R, Moreno-Garrido I, Gil MA, Mosquera MJ. Effects of surface functionalization with alkylalkoxysilanes on the structure, visible light photoactivity and biocidal performance of Ag-TiO2 nanoparticles. POWDER TECHNOL 2021. [DOI: 10.1016/j.powtec.2021.01.050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Tan P, Li H, Wang J, Gopinath SCB. Silver nanoparticle in biosensor and bioimaging: Clinical perspectives. Biotechnol Appl Biochem 2020; 68:1236-1242. [PMID: 33043496 DOI: 10.1002/bab.2045] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Accepted: 09/29/2020] [Indexed: 12/18/2022]
Abstract
Recent developments in nanotechnology promoted the production of nanomaterials with various shapes and sizes by utilizing interdisciplinary researches of biology, chemistry, and material science toward the clinical perspectives. In particular, gold and silver (Ag) are noble metals that exhibit tunable and unique plasmonic properties for the downstream applications. Ag exhibits higher thermal and electrical conductivities, and more efficient in the electron transfer than gold with sharper extinction bands. In addition, modified Ag nanoparticle is more stable in water and air. With all these above features, Ag is an attractive tool in various fields, including diagnosis, drug delivery, environmental, electronics, and as antimicrobial agent. In particular, applications of Ag nanoparticle in the fields of biosensor and imaging are prominent in recent days. Enhancing the specific detection of clinical markers with Ag nanoparticle has been proved by several studies. This review discussed the constructive application of Ag nanoparticle in biosensor and bioimaging for the detection of small molecule to larger whole cell in the perspectives of diagnosing diseases.
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Affiliation(s)
- Peng Tan
- Ultrasound Diagnosis Department, Affiliated Hospital of Jiangxi University of Traditional Chinese Medicine, Nanchang City, Jiangxi Province, People's Republic of China
| | - HeSheng Li
- General Surgery, Leping people's Hospital, Phoenix Avenue, Leping, Jiangxi Province, People's Republic of China
| | - Jian Wang
- Clinical Laboratory, Affiliated Hospital of Jiangxi University of traditional Chinese Medicine, Nanchang City, Jiangxi Province, People's Republic of China
| | - Subash C B Gopinath
- Faculty of Chemical Engineering Technology, Universiti Malaysia Perlis, Arau, Perlis, 02600, Malaysia.,Institute of Nano Electronic Engineering, Universiti Malaysia Perlis, Kangar, Perlis, 01000, Malaysia
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Gudz KY, Permyakova ES, Matveev AT, Bondarev AV, Manakhov AM, Sidorenko DA, Filippovich SY, Brouchkov AV, Golberg DV, Ignatov SG, Shtansky DV. Pristine and Antibiotic-Loaded Nanosheets/Nanoneedles-Based Boron Nitride Films as a Promising Platform to Suppress Bacterial and Fungal Infections. ACS APPLIED MATERIALS & INTERFACES 2020; 12:42485-42498. [PMID: 32845601 DOI: 10.1021/acsami.0c10169] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In recent years, bacteria inactivation during their direct physical contact with surface nanotopography has become one of the promising strategies for fighting infection. Contact-killing ability has been reported for several nanostructured surfaces, e.g., black silicon, carbon nanotubes, zinc oxide nanorods, and copper oxide nanosheets. Herein, we demonstrate that Gram-negative antibiotic-resistant Escherichia coli (E. coli) bacteria are killed as a result of their physical destruction while contacting nanostructured h-BN surfaces. BN films, made of spherical nanoparticles formed by numerous nanosheets and nanoneedles with a thickness <15 nm, have been obtained through a reaction of ammonia with amorphous boron. The contact-killing bactericidal effect of BN nanostructures has been compared with a toxic effect of gentamicin released from them. For a wider protection against bacterial and fungal infection, the films have been saturated with a mixture of gentamicin and amphotericin B. Such BN films demonstrate a high antibiotic/antimycotic agent loading capacity and a fast initial and sustained release of therapeutic agents for 170-260 h depending on the loaded dose. The pristine BN films possess high antibacterial activity against E. coli K-261 strain at their initial concentration of 104 cells/mL, attaining >99% inactivation of colony forming units after 24 h, same as gentamicin-loaded (150 μg/cm2) BN sample. The BN films loaded with a mixture of gentamicin (150 and 300 μg/cm2) and amphotericin B (100 μg/cm2) effectively inhibit the growth of E. coli K-261 and Neurospora crassa strains. During immersion in the normal saline solution, the BN film generates reactive oxygen species (ROS), which can lead to accelerated oxidative stress at the site of physical cell damage. The obtained results are valuable for further development of nanostructured surfaces having contact killing, ROS, and biocide release abilities.
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Affiliation(s)
- Kristina Y Gudz
- National University of Science and Technology "MISIS", Leninsky prospect 4, Moscow 119049, Russia
| | - Elizaveta S Permyakova
- National University of Science and Technology "MISIS", Leninsky prospect 4, Moscow 119049, Russia
| | - Andrei T Matveev
- National University of Science and Technology "MISIS", Leninsky prospect 4, Moscow 119049, Russia
| | - Andrey V Bondarev
- Department of Control Engineering, Faculty of Electrical Engineering, Czech Technical University in Prague, Technicka 2, Prague 6 16627, Czech Republic
| | - Anton M Manakhov
- National University of Science and Technology "MISIS", Leninsky prospect 4, Moscow 119049, Russia
| | - Daria A Sidorenko
- National University of Science and Technology "MISIS", Leninsky prospect 4, Moscow 119049, Russia
| | - Svetlana Y Filippovich
- Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky prospect 33, bld. 2, Moscow 119071, Russia
| | - Anatoli V Brouchkov
- Lomonosov Moscow State University, GSP1, Leninskie Gory, Moscow 119991 Russia
| | - Dmitri V Golberg
- Centre for Materials Science and School of Chemistry and Physics, Queensland University of Technology (QUT), Second George St., Brisbane, QLD 4000, Australia
- International Centre for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 3050044, Japan
| | - Sergei G Ignatov
- State Research Center for Applied Microbiology and Biotechnology, Obolensk, Moscow Region 142279, Russia
| | - Dmitry V Shtansky
- National University of Science and Technology "MISIS", Leninsky prospect 4, Moscow 119049, Russia
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The Impact of Engineered Silver Nanomaterials on the Immune System. NANOMATERIALS 2020; 10:nano10050967. [PMID: 32443602 PMCID: PMC7712063 DOI: 10.3390/nano10050967] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Revised: 05/04/2020] [Accepted: 05/05/2020] [Indexed: 01/07/2023]
Abstract
Over the last decades there has been a tremendous volume of research efforts focused on engineering silver-based (nano)materials. The interest in silver has been mostly driven by the element capacity to kill pathogenic bacteria. In this context, the main area of application has been medical devices that are at significant risk of becoming colonized by bacteria and subsequently infected. However, silver nanomaterials have been incorporated in a number of other commercial products which may or may not benefit from antibacterial protection. The rapid expansion of such products raises important questions about a possible adverse influence on human health. This review focuses on examining currently available literature and summarizing the current state of knowledge of the impact of silver (nano)materials on the immune system. The review also looks at various surface modification strategies used to generate silver-based nanomaterials and the immunomodulatory potential of these materials. It also highlights the immune response triggered by various silver-coated implantable devices and provides guidance and perspective towards engineering silver nanomaterials for modulating immunological consequences.
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Mohammed SH, Ahmed MM, Al-Mousawi AM, Azeez A. Seasonal behavior and forecasting trends of tuberculosis incidence in Holy Kerbala, Iraq. Int J Mycobacteriol 2019; 7:361-367. [PMID: 30531036 DOI: 10.4103/ijmy.ijmy_109_18] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Background Pulmonary tuberculosis (PTB) remains major public health problem over the world. Cities witnessing religious event throughout of the year like Kerbala/Iraq require great efforts to minimize the incidence of deadly communicable diseases like TB. The aim of this study is to model the monthly incidence rates of PTB cases in Kerbala/Iraq. Methods This is a retrospective study in which records of confirmed PTB patients whom they referred to the chest and respiratory illnesses center of Holy Kerbala governorate were obtained. Monthly registered new smear-positive PTB cases from January 2010 to December 2016 were analyzed. Seasonal autoregressive integrated moving average (SARIMA), SARIMA-exponential smoothing method (ETS), SARIMA-neural network autoregressive, and SARIMA-adaptive neuro-fuzzy inference system (SARIMA-ANFIS) were used for forecasting monthly incidence rate of TB in Kerbala, Iraq. Mean absolute percentage error, root mean square error, and mean absolute square error were used to compare the models, and Akaike information criterion (AIC) and Bayesian information criterion (BIC) were used to selected best model. Results The trend of PTB incidence showed a seasonal characteristic, with peaks in spring and winter. Predicted estimates using all models proposed to forecast the number of PTB cases from 2016 to 2018 showed that the PTB cases indicated marginal decrease trends and best forecasted in SARIMA-ANFIS model (the lower AIC and BIC values, 712.69 and 731.05, respectively). Conclusion Seasonal characteristic of PTB incidence was observed with peaks during spring and winter. Forecasting of PTB incidence between the period 2016 and 2018 showed marginal decrease trends, and the best forecasting model was SARIMA-ANFIS model.
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Affiliation(s)
- Suhad Hadi Mohammed
- Department of Clinical Laboratories, College of Applied Medical Sciences, Kerbala University, Kerbala, Iraq
| | - Mohanad Mohsin Ahmed
- Department of Microbiology, College of Medicine, Kerbala University, Kerbala, Iraq
| | - Ali Mousa Al-Mousawi
- Department of Family Medicine, College of Medicine, Kerbala University, Kerbala, Iraq
| | - Adeboye Azeez
- Department of Statistics, Biostatistics and Epidemiology Research, University of Fort Hare, Alice, South Africa
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Kim H, Cho J, Cho J, Park BJ, Kim JW. Magnetic-Patchy Janus Colloid Surfactants for Reversible Recovery of Pickering Emulsions. ACS APPLIED MATERIALS & INTERFACES 2018; 10:1408-1414. [PMID: 29243915 DOI: 10.1021/acsami.7b15894] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We present a straightforward and robust method for the synthesis of Janus colloid surfactants with distinct amphiphilicity and magnetic responsiveness. To this end, hydroxyl-functionalized amphiphilic Janus microparticles (JMPs) are synthesized by seeded monomer swelling and subsequent photopolymerization. By incorporating controlled amounts of hydroxyl groups on poly(styrene-co-vinyl alcohol) seed particles, we adjust the interfacial tension between the seed polymer and the poly(tetradecyl acrylate) secondary polymer (γ13). From theoretical and experimental observations, we verify that when γ13 is tuned to ∼8.5 mN/m in a medium with controlled solvency, which corresponds to a 0.6 volume fraction of ethanol in water, the particles bicompartmentalize to form oval or ellipsoidal JMPs with controllable bulb dimensions. We also show that bulb site-specific patching of magnetic nanoparticles (NPs) can be achieved using the electrostatic interaction between the polyethylenimine-coated bulb surface and the polyvinylpyrrolidone-stabilized Fe2O3 NPs. Finally, we demonstrate that our magnetic-patchy JMPs can assemble at the oil-water interface, enabling magnetic-responsive reversible recovery of Pickering emulsions.
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Affiliation(s)
| | | | | | - Bum Jun Park
- Department of Chemical Engineering, Kyung Hee University , Yongin 17104, Republic of Korea
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12
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Incorporation of silver nanoparticles into magnetron-sputtered calcium phosphate layers on titanium as an antibacterial coating. Colloids Surf B Biointerfaces 2017; 156:104-113. [PMID: 28527354 DOI: 10.1016/j.colsurfb.2017.05.016] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 05/02/2017] [Accepted: 05/07/2017] [Indexed: 01/04/2023]
Abstract
A three-layer system of nanocrystalline hydroxyapatite (first layer; 1000nm thick), silver nanoparticles (second layer; 1.5μg Ag cm-2) and calcium phosphate (third layer, either 150 or 1000nm thick) on titanium was prepared by a combination of electrophoretic deposition of silver nanoparticles and the deposition of calcium phosphate by radio frequency magnetron sputtering. Scanning electron microscopy showed that the silver nanoparticles were evenly distributed over the surface. The adhesion of multilayered coating on the substrate was evaluated using the scratch test method. The resistance to cracking and delamination indicated that the multilayered coating has good resistance to contact damage. The release of silver ions from the hydroxyapatite/silver nanoparticle/calcium phosphate system into the phosphate-buffered saline (PBS) solution was measured by atomic absorption spectroscopy (AAS). Approximately one-third of the incorporated silver was released after 3days immersion into PBS, indicating a total release time of the order of weeks. There were no signs of cracks on the surface of the coating after immersion after various periods, indicating the excellent mechanical stability of the multilayered coating in the physiological environment. An antimicrobial effect against Escherichia coli was found for a 150nm thick outer layer of the calcium phosphate using a semi-quantitative turbidity test.
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