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Ali S, Ran J, Luan Y, Khorrami B, Xiao Y, Tangdamrongsub N. The GWR model-based regional downscaling of GRACE/GRACE-FO derived groundwater storage to investigate local-scale variations in the North China Plain. Sci Total Environ 2024; 908:168239. [PMID: 37931810 DOI: 10.1016/j.scitotenv.2023.168239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 09/30/2023] [Accepted: 10/29/2023] [Indexed: 11/08/2023]
Abstract
Groundwater storage and depletion fluctuations in response to groundwater availability for irrigation require understanding on a local scale to ensure a reliable groundwater supply. However, the coarser spatial resolution and intermittent data gaps to estimate the regional groundwater storage anomalies (GWSA) prevent the Gravity Recovery and Climate Experiment (GRACE) and GRACE Follow-On (GARCE-FO) mission from being applied at the local scale. To enhance the resolution of GWSA measurements using machine learning approaches, numerous recent efforts have been made. With a focus on the development of a new algorithm, this study enhanced the GWSA resolution estimates to 0.05° by extensively investigating the continuous spatiotemporal variations of GWSA based on the regional downscaling approach using a regression algorithm known as the geographically weighted regression model (GWR). First, the modified seasonal decomposition LOESS method (STL) was used to estimate the continuous terrestrial water storage anomaly (TWSA). Secondly, to separate GWSA from TWSA, a water balance equation was used. Third, the continuous GWSA was downscaled to 0.05° based on the GWR model. Finally, spatio-temporal properties of downscaled GWSA were investigated in the North China Plain (NCP), China's fastest-urbanizing area, from 2003 to 2022. The results of the downscaled GWSA were spatially compatible with GRACE-derived GWSA. The downscaled GWSA results are validated (R = 0.83) using in-situ groundwater level data. The total loss of GWSA in cities of the NCP fluctuated between 2003 and 2022, with the largest loss seen in Handan (-15.21 ± 7.25 mm/yr), Xingtai (-14.98 ± 7.25 mm/yr), and Shijiazhuang (-14.58 ± 7.25 mm/yr). The irrigated winter-wheat farming strategy is linked to greater groundwater depletion in several cities of NCP (e.g., Xingtai, Handan, Anyang, Hebi, Puyang, and Xinxiang). The study's high-resolution findings can help with understanding local groundwater depletion that takes agricultural water utilization and provide quantitative data for water management.
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Affiliation(s)
- Shoaib Ali
- Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen 518005, China.
| | - Jiangjun Ran
- Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen 518005, China.
| | - Yi Luan
- Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen 518005, China.
| | - Behnam Khorrami
- Department of GIS, The Graduate School of Natural and Applied Sciences, Dokuz Eylul University, Izmir, Türkiye.
| | - Yun Xiao
- Xi'an Research Institute of Surveying and Mapping, Xi'an, China
| | - Natthachet Tangdamrongsub
- Water Engineering and Management, School of Engineering and Technology, Asian Institute of Technology, Pathum Thani 12120, Thailand.
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Randell Z, Dehghanbanadaki H, Fendereski K, Jimbo M, Aston K, Hotaling J. Sperm telomere length in male-factor infertility and reproduction. Fertil Steril 2024; 121:12-25. [PMID: 37949346 DOI: 10.1016/j.fertnstert.2023.11.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Revised: 11/02/2023] [Accepted: 11/03/2023] [Indexed: 11/12/2023]
Abstract
The underlying reasons for male-factor infertility are often unknown. 30% of all men have unexplained semen analysis abnormalities. Moreover, 15%-40% of infertile men have normal semen analyses. There have been increasing efforts to identify causes and associations that may explain idiopathic male-factor infertility. Telomeres have become an area of considerable interest in the field because of the essential roles they have in cellular division and genome integrity. Research to date most consistently supports that men with infertility have shorter sperm telomere length (STL); however, associations between shorter STL and meaningful reproductive health outcomes are less consistent. There is a major need for additional studies to better identify the role of STL in male reproductive health and use the information to improve the counseling and treatment of couples with idiopathic male-factor infertility.
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Affiliation(s)
- Zane Randell
- Division of Urology, Department of Surgery, University of Utah, Salt Lake City, Utah.
| | - Hojat Dehghanbanadaki
- Division of Urology, Department of Surgery, University of Utah, Salt Lake City, Utah
| | - Kiarad Fendereski
- Division of Urology, Department of Surgery, University of Utah, Salt Lake City, Utah
| | - Masaya Jimbo
- Division of Urology, Department of Surgery, University of Utah, Salt Lake City, Utah
| | - Kenneth Aston
- Division of Urology, Department of Surgery, University of Utah, Salt Lake City, Utah
| | - James Hotaling
- Division of Urology, Department of Surgery, University of Utah, Salt Lake City, Utah
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Seto H, Toki H, Kitora S, Oyama A, Yamamoto R. Seasonal variations of the prevalence of metabolic syndrome and its markers using big-data of health check-ups. Environ Health Prev Med 2024; 29:2. [PMID: 38246652 PMCID: PMC10808004 DOI: 10.1265/ehpm.23-00216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Accepted: 12/07/2023] [Indexed: 01/23/2024] Open
Abstract
BACKGROUND It is crucial to understand the seasonal variation of Metabolic Syndrome (MetS) for the detection and management of MetS. Previous studies have demonstrated the seasonal variations in MetS prevalence and its markers, but their methods are not robust. To clarify the concrete seasonal variations in the MetS prevalence and its markers, we utilized a powerful method called Seasonal Trend Decomposition Procedure based on LOESS (STL) and a big dataset of health checkups. METHODS A total of 1,819,214 records of health checkups (759,839 records for men and 1,059,375 records for women) between April 2012 and December 2017 were included in this study. We examined the seasonal variations in the MetS prevalence and its markers using 5 years and 9 months health checkup data and STL analysis. MetS markers consisted of waist circumference (WC), systolic blood pressure (SBP), diastolic blood pressure (DBP), triglycerides (TG), high-density lipoprotein cholesterol (HDL-C), fasting plasma glucose (FPG). RESULTS We found that the MetS prevalence was high in winter and somewhat high in August. Among men, MetS prevalence was 2.64 ± 0.42 (mean ± SD) % higher in the highest month (January) than in the lowest month (June). Among women, MetS prevalence was 0.53 ± 0.24% higher in the highest month (January) than in the lowest month (June). Additionally, SBP, DBP, and HDL-C exhibited simple variations, being higher in winter and lower in summer, while WC, TG, and FPG displayed more complex variations. CONCLUSIONS This finding, complex seasonal variations of MetS prevalence, WC, TG, and FPG, could not be derived from previous studies using just the mean values in spring, summer, autumn and winter or the cosinor analysis. More attention should be paid to factors affecting seasonal variations of central obesity, dyslipidemia and insulin resistance.
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Affiliation(s)
- Hiroe Seto
- Graduate School of Human Sciences, Osaka University, Osaka 565-0871, Japan
- Health Care Division, Health and Counseling Center, Osaka University, Osaka 560-0043, Japan
| | - Hiroshi Toki
- Health Care Division, Health and Counseling Center, Osaka University, Osaka 560-0043, Japan
- Research Center for Nuclear Physics, Osaka University, Osaka 567-0047, Japan
| | - Shuji Kitora
- Health Care Division, Health and Counseling Center, Osaka University, Osaka 560-0043, Japan
| | - Asuka Oyama
- Health Care Division, Health and Counseling Center, Osaka University, Osaka 560-0043, Japan
| | - Ryohei Yamamoto
- Health Care Division, Health and Counseling Center, Osaka University, Osaka 560-0043, Japan
- Laboratory of Behavioral Health Promotion, Department of Health Promotion, Graduate School of Medicine, Osaka University, Osaka 565-0043, Japan
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Abad-Coronel C, Pazán DP, Hidalgo L, Larriva Loyola J. Comparative Analysis between 3D-Printed Models Designed with Generic and Dental-Specific Software. Dent J (Basel) 2023; 11:216. [PMID: 37754336 PMCID: PMC10529710 DOI: 10.3390/dj11090216] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 08/28/2023] [Accepted: 09/11/2023] [Indexed: 09/28/2023] Open
Abstract
With the great demand in the market for new dental software, the need has been seen to carry out a precision study for applications in digital dentistry, for which there is no comparative study, and there is a general ignorance regarding their applications. The purpose of this study was to investigate the accuracy differences between digital impressions obtained using generic G-CAD (general CAD) and D-CAD (CAD dental) software. Today, there is a difference between the design software used in dentistry and these in common use. Thus, it is necessary to make a comparison of precision software for specific and generic dental use. We hypothesized that there is no significant difference between the software for specific and general dental use. METHODS A typodont was digitized with an intraoral scanner and the models obtained were exported in STL format to four different softwares (Autodesk MeshMixer 3.5, Exocad Dental, Blender for dental, and InLAB). The STL files obtained by each software were materialized using a 3D printer. The printed models were scanned and exported in STL files, with which six pairs of groups were formed. The groups were compared using analysis software (3D Geomagic Control X) by superimposing them in the initial alignment order and using the best fit method. RESULTS There were no significant differences between the four analyzed software types; however, group 4, composed of the combination of D-CAD (Blender-InLAB), obtained the highest average (-0.0324 SD = 0.0456), with a higher accuracy compared to the group with the lowest average (group 5, composed of the combination of the Meshmixer and Blender models), a generic software and a specific software (0.1024 SD = 0.0819). CONCLUSION Although no evidence of significant difference was found regarding the accuracy of 3D models produced by G-CAD and D-CAD, combinations of groups where specific dental design software was present showed higher accuracy (precision and trueness). The comparison of the 3D graphics obtained with the superimposition of the digital meshes of the printed models performed with the help of the analysis software using the best fit method, replicating the same five reference points for the six groups formed, evidenced a greater tolerance in the groups using D-CAD.
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Affiliation(s)
- Cristian Abad-Coronel
- CAD/CAM Materials and Digital Dentistry Research Group, Faculty of Dentistry, Universidad de Cuenca, Cuenca 010107, Ecuador
| | - Doménica Patricia Pazán
- Faculty of Dentistry, Universidad de Cuenca, Cuenca 010101, Ecuador; (D.P.P.); (L.H.); (J.L.L.)
| | - Lorena Hidalgo
- Faculty of Dentistry, Universidad de Cuenca, Cuenca 010101, Ecuador; (D.P.P.); (L.H.); (J.L.L.)
| | - Jaime Larriva Loyola
- Faculty of Dentistry, Universidad de Cuenca, Cuenca 010101, Ecuador; (D.P.P.); (L.H.); (J.L.L.)
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Muller H, Fossey A. Stereolithography ( STL) measurement rubric for the evaluation of craniomaxillofacial STLs. 3D Print Med 2022; 8:25. [PMID: 35934728 PMCID: PMC9358852 DOI: 10.1186/s41205-022-00151-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Accepted: 07/05/2022] [Indexed: 11/10/2022] Open
Abstract
Background Facial deformities often demand reconstructive surgery and the placement of three-dimensional (3D) printed craniomaxillofacial prostheses. Prostheses manufacturing requires patients’ computed tomography (CT) images. Poor quality images result in incorrectly sized prostheses, necessitating repeat imaging and refitting. The Centre for Rapid Prototyping and Manufacturing (CRPM) produces most facial prostheses in South Africa but does not have a prescribed optimised CT protocol. Therefore, this study was undertaken. Methods A collection of CRPM STLs used in the design and manufacturing of craniomaxillofacial prostheses is available. The image quality of stereolithography (STL) files of CRPM CT scans was evaluated to determine what constitutes good image quality. This collection was scrutinised for inclusion in the image quality evaluation. After scrutiny, 35 STLs of individuals ≥15 years of age were selected and included metadata attached to the DICOM file. Furthermore, only STLs created without manipulation by the same designer were included in the collection. Before the qualitative evaluation of the STLs, eight different critical anatomical reference points (CARPs) were identified with the assistance of an expert team. A visual acuity rating scale of three categories was devised for each CARP, where 1 was allocated to poor visual acuity, 2 to partial, and 3 to good visual acuity. Similarly, rating scales were devised for the presence of concentric rings and the overall impression score awarded by the two designers involved in the design and manufacturing of the prostheses. This stereolithography measurement rubric (SMR) was then applied to the 35 STLs by a team of three experts, including the two designers, during a structured evaluation session. The scores were used to calculate summary and inferential statistics. Results Scores grouped around the central rating of partial visual acuity. The three evaluators’ mean total CARP scores ranged from 13.1 to 14.4 (maximum possible score 24), while the mean total CARP + ring scores ranged from 15.8 to 17.1 (maximum possible score 27). No significant differences were detected between the evaluators’ scores. Conclusion This SMR appears to be the first of its kind. This image quality assessment of STLs provides the groundwork for finer CT image quality evaluation to formulate a CT imaging protocol for the CRPM to design and manufacture accurate internal cranial prostheses.
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Affiliation(s)
- Henra Muller
- Department of Clinical Imaging Sciences, School of Clinical Medicine, Faculty of Health Sciences, University of the Free State, Bloemfontein, South Africa. .,Department of Clinical Sciences, Faculty of Health and Environmental Sciences, Central University of Technology Free State, C/o Park Road & President Brand Street, Bloemfontein, 9300, South Africa.
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Asar NV, Yun S, Schwartz S, Turkyilmaz I. Analysis of the relationship between the surface topography of prepared tooth surfaces and data quality of digital impressions from an intraoral scanner. J Dent Sci 2022; 17:545-50. [PMID: 35028082 DOI: 10.1016/j.jds.2021.07.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 07/16/2021] [Indexed: 11/21/2022] Open
Abstract
Background/purpose With the rise of digitalization in dentistry, intraoral scanners and digital impressions have recently been adopted by many clinicians. The aim of this study was to investigate surface topography of prepared teeth and the accuracy of digital impressions. Materials and methods Twenty mandibular typodonts, containing left first premolar and left first molar abutment teeth manufactured by using CAD/CAM, were used in this study. An intraoral scanner was used to scan each typodont, and each STL file generated was exported in high resolution (Group H), moderate resolution (Group M), and low resolution (Group L). All 60 files were inspected in a 3-D mesh processing software. For each file, the number of triangulation points in the meshwork were obtained for both abutment teeth. Results The measurements obtained from the 3-D mesh processing software revealed that the mean number of triangulation points on the 3-D surface of the abutment teeth (20 premolars + 20 M) were 790,625 ± 98,890 dots in Group H, 592,283 ± 74,881 dots in Group M, and 198,067 ± 19,328 dots in Group L. Significant differences were found between Group H and M (p < 0.05), Group H and L (p < 0.001), and Group M and L (p < 0.01). Conclusion The outcomes of this study reveal that there are strong correlations between the data quality of digital impressions and surface topography of prepared teeth. Therefore, the utilization of STL files in high resolution format is the recommended choice for clinicians engaging in a digital workflow process.
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Turkyilmaz I, Wilkins GN, Benli M. Relationship between the data quality of digital scans from intraoral scanners and surface topography of prepared teeth. J Dent Sci 2022; 17:592-594. [PMID: 35028093 PMCID: PMC8738113 DOI: 10.1016/j.jds.2021.06.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 06/03/2021] [Indexed: 12/01/2022] Open
Affiliation(s)
- Ilser Turkyilmaz
- New York University College of Dentistry, Department of Prosthodontics, New York, NY, USA
| | | | - Merve Benli
- University of Pittsburgh, School of Dental Medicine, Department of Oral Biology, Pittsburgh, PA, USA.,Istanbul University, School of Dentistry, Department of Prosthodontics, Istanbul, Turkey
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Turkyilmaz I. Correlation between the data quality of digital impressions and surface topography of prepared teeth. J Dent Sci 2022; 17:583-585. [PMID: 35028090 PMCID: PMC8739252 DOI: 10.1016/j.jds.2021.06.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Revised: 06/19/2021] [Indexed: 11/25/2022] Open
Affiliation(s)
- Ilser Turkyilmaz
- New York University College of Dentistry, Department of Prosthodontics, New York, NY, USA
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Gentiluomo M, Luddi A, Cingolani A, Fornili M, Governini L, Lucenteforte E, Baglietto L, Piomboni P, Campa D. Telomere Length and Male Fertility. Int J Mol Sci 2021; 22:ijms22083959. [PMID: 33921254 PMCID: PMC8069448 DOI: 10.3390/ijms22083959] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Revised: 04/03/2021] [Accepted: 04/08/2021] [Indexed: 12/23/2022] Open
Abstract
Over the past decade, telomeres have attracted increasing attention due to the role they play in human fertility. However, conflicting results have been reported on the possible association between sperm telomere length (STL) and leukocyte telomere length (LTL) and the quality of the sperm parameters. The aim of this study was to run a comprehensive study to investigate the role of STL and LTL in male spermatogenesis and infertility. Moreover, the association between the sperm parameters and 11 candidate single nucleotide polymorphisms (SNPs), identified in the literature for their association with telomere length (TL), was investigated. We observed no associations between sperm parameters and STL nor LTL. For the individual SNPs, we observed five statistically significant associations with sperm parameters: considering a p < 0.05. Namely, ACYP2˗rs11125529 and decreased sperm motility (p = 0.03); PXK˗rs6772228 with a lower sperm count (p = 0.02); NAF1˗rs7675998 with increased probability of having abnormal acrosomes (p = 0.03) and abnormal flagellum (p = 0.04); ZNF208˗rs8105767 and reduction of sperms with normal heads (p = 0.009). This study suggests a moderate involvement of telomere length in male fertility; however, in our analyses four SNPs were weakly associated with sperm variables, suggesting the SNPs to be pleiotropic and involved in other regulatory mechanisms independent of telomere homeostasis, but involved in the spermatogenic process.
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Affiliation(s)
- Manuel Gentiluomo
- Department of Biology, University of Pisa, 56126 Pisa, Italy; (M.G.); (A.C.); (D.C.)
| | - Alice Luddi
- Department of Molecular and Developmental Medicine, Siena University, 53100 Siena, Italy; (A.L.); (L.G.)
| | - Annapaola Cingolani
- Department of Biology, University of Pisa, 56126 Pisa, Italy; (M.G.); (A.C.); (D.C.)
| | - Marco Fornili
- Department of Clinical and Experimental Medicine, University of Pisa, 56126 Pisa, Italy; (M.F.); (E.L.); (L.B.)
| | - Laura Governini
- Department of Molecular and Developmental Medicine, Siena University, 53100 Siena, Italy; (A.L.); (L.G.)
| | - Ersilia Lucenteforte
- Department of Clinical and Experimental Medicine, University of Pisa, 56126 Pisa, Italy; (M.F.); (E.L.); (L.B.)
| | - Laura Baglietto
- Department of Clinical and Experimental Medicine, University of Pisa, 56126 Pisa, Italy; (M.F.); (E.L.); (L.B.)
| | - Paola Piomboni
- Department of Molecular and Developmental Medicine, Siena University, 53100 Siena, Italy; (A.L.); (L.G.)
- Correspondence: ; Tel.: +39-057-758-6632
| | - Daniele Campa
- Department of Biology, University of Pisa, 56126 Pisa, Italy; (M.G.); (A.C.); (D.C.)
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Zhou L, Li L, Hao G, Li B, Yang S, Wang N, Liang J, Sun H, Ma S, Yan L, Zhao C, Wei Y, Niu Y, Zhang R. Sperm mtDNA copy number, telomere length, and seminal spermatogenic cells in relation to ambient air pollution: Results of a cross-sectional study in Jing-Jin-Ji region of China. J Hazard Mater 2021; 406:124308. [PMID: 33257117 DOI: 10.1016/j.jhazmat.2020.124308] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 09/15/2020] [Accepted: 10/15/2020] [Indexed: 06/12/2023]
Abstract
Evidences on the association of air pollutants and semen quality were limited and mechanism-based biomarkers were sparse. We enrolled 423 men at a fertility clinic in Shijiazhuang, China to evaluate associations between air pollutants and semen quality parameters including the conventional ones, sperm mitochondrial DNA copy number (mtDNAcn), sperm telomere length (STL) and seminal spermatogenic cells. PM2.5, PM10, CO, SO2, NO2 and O3 exposure during lag0-90, lag0-9, lag10-14 and lag70-90 days were evaluated with ordinary Kringing model. The exposure-response correlations were analyzed with multiple linear regression models. CO, PM2.5 and PM10 were adversely associated with conventional semen parameters including sperm count, motility and morphology. Besides, CO was positively associated with seminal primary spermatocyte (lag70-90, 0.49; 0.14, 0.85) and mtDNAcn (lag0-90, 0.37; 0.12, 0.62, lag10-14, 0.31; 0.12, 0.49), negatively associated with STL (lag0-9, -0.30; -0.57, -0.03). PM2.5 was positively associated with mtDNAcn (0.50; 0.24, 0.75 and 0.38; 0.02, 0.75 for lag0-90 and lag70-90) while negatively associated with STL (lag70-90, -0.49; -0.96, -0.01). PM10 and NO2 were positively associated with mtDNAcn. Our findings indicate CO and PM might impair semen quality testicularly and post-testicularly while seminal spermatogenic cell, STL and mtDNAcn change indicate necessity for more attention on these mechanisms.
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Affiliation(s)
- Lixiao Zhou
- Department of Toxicology, School of Public Health, Hebei Medical University, Shijiazhuang 050017, PR China; School of Public Health and Management, Chongqing Medical University, Chongqing 400016, PR China
| | - Lipeng Li
- Department of Toxicology, School of Public Health, Hebei Medical University, Shijiazhuang 050017, PR China; Department of Reproductive Medicine, The Second Hospital of Hebei Medical University, Shijiazhuang 050017, PR China
| | - Guimin Hao
- Department of Reproductive Medicine, The Second Hospital of Hebei Medical University, Shijiazhuang 050017, PR China
| | - Binghua Li
- Department of Occupational Health and Environmental Health, School of Public Health, Hebei Medical University, Shijiazhuang 050017, PR China
| | - Sujuan Yang
- Department of Reproductive Medicine, The Second Hospital of Hebei Medical University, Shijiazhuang 050017, PR China
| | - Ning Wang
- Department of Reproductive Medicine, The Second Hospital of Hebei Medical University, Shijiazhuang 050017, PR China
| | - Jiaming Liang
- Department of Toxicology, School of Public Health, Hebei Medical University, Shijiazhuang 050017, PR China
| | - Hongyue Sun
- Department of Toxicology, School of Public Health, Hebei Medical University, Shijiazhuang 050017, PR China
| | - Shitao Ma
- Department of Occupational Health and Environmental Health, School of Public Health, Hebei Medical University, Shijiazhuang 050017, PR China
| | - Lina Yan
- Department of Toxicology, School of Public Health, Hebei Medical University, Shijiazhuang 050017, PR China
| | - Chunfang Zhao
- Department of Histology and Embryology, Schoolof Basic Medical Science, Hebei Medical University, Shijiazhuang 050017, PR China
| | - Yanjing Wei
- Department of Laboratory Diagnostics, School of Basic Medical Science, Hebei Medical University, Shijiazhuang 050017, PR China
| | - Yujie Niu
- Department of Occupational Health and Environmental Health, School of Public Health, Hebei Medical University, Shijiazhuang 050017, PR China; Hebei Key Laboratory of Environment and Human Health, Shijiazhuang 050017, PR China
| | - Rong Zhang
- Department of Toxicology, School of Public Health, Hebei Medical University, Shijiazhuang 050017, PR China; Hebei Key Laboratory of Environment and Human Health, Shijiazhuang 050017, PR China.
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Reymus M, Liebermann A, Diegritz C, Keßler A. Development and evaluation of an interdisciplinary teaching model via 3D printing. Clin Exp Dent Res 2020; 7:3-10. [PMID: 33108832 PMCID: PMC7853885 DOI: 10.1002/cre2.334] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 09/21/2020] [Accepted: 09/27/2020] [Indexed: 12/28/2022] Open
Abstract
The investigation aimed to assess the feasibility of creating an interdisciplinary training model simulating endodontic, restorative as well as implantologic treatment procedures by using 3D printing technology. A CBCT scan of the mandible of a real patient was initially taken. The generated DICOM-data were converted to a STL-file, which was further processed to design spaces for exchangeable replica teeth, a bone segment and an adapter to fix the model in a mannequin's head. After the manufacturing process, the model was evaluated by dental students performing a root canal treatment, the insertion of a glass fibre post and the insertion of an implant. The workflow allowed a simple and cost-effective way of manufacturing a single model, which is suitable for several training scenarios in the fields of endodontics, prosthodontics and implantology. The model was rated as being comparable to the real patient situation and offers repetitive treatment simulations. The present workflow is a feasible way of using DICOM-data and 3D printing for an interdisciplinary training model. The dental schools can design models according to their own curriculum and put the focus on a patient centered education.
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Affiliation(s)
- Marcel Reymus
- Department of Conservative Dentistry and Periodontology, University Hospital, Ludwig-Maximilians-University, Munich, Germany
| | - Anja Liebermann
- Department of Prosthetic Dentistry, University Hospital, Ludwig-Maximilians-University, Munich, Germany
| | - Christian Diegritz
- Department of Conservative Dentistry and Periodontology, University Hospital, Ludwig-Maximilians-University, Munich, Germany
| | - Andreas Keßler
- Department of Conservative Dentistry and Periodontology, University Hospital, Ludwig-Maximilians-University, Munich, Germany
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Shah D, Naik L, Paunipagar B, Rasalkar D, Chaudhary K, Bagaria V. Setting Up 3D Printing Services for Orthopaedic Applications: A Step-by-Step Guide and an Overview of 3DBioSphere. Indian J Orthop 2020; 54:217-227. [PMID: 33194095 PMCID: PMC7609604 DOI: 10.1007/s43465-020-00254-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Accepted: 09/03/2020] [Indexed: 02/04/2023]
Abstract
INTRODUCTION 3D printing has widespread applications in orthopaedics including creating biomodels, patient-specific instruments, implants, and developing bioprints. 3DGraphy or printing 3D models enable the surgeon to understand, plan, and simulate different procedures on it. Despite widespread applications in non-healthcare specialties, it has failed to gain traction in healthcare settings. This is perhaps due to perceived capital expenditure cost and the lack of knowledge and skill required to execute the process. PURPOSE This article is written with an aim to provide step-by-step instructions for setting up a cost-efficient 3D printing laboratory in an institution or standalone radiology centre. The article with the help of video modules will explain the key process of segmentation, especially the technique of edge detection and thresholding which are the heart of 3D printing. CONCLUSION This is likely to enable the practising orthopaedician and radiologist to set up a 3D printing unit in their departments or even standalone radiology centres at minimal startup costs. This will enable maximal utilisation of this technology that is likely to bring about a paradigm shift in planning, simulation, and execution of complex surgeries.
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Affiliation(s)
- Darshil Shah
- grid.465035.1Department of Orthopaedics, Sir HN Reliance Foundation Hospital, Mumbai, India
| | - Lokesh Naik
- grid.465035.1Department of Orthopaedics, Sir HN Reliance Foundation Hospital, Mumbai, India
| | - Bhawan Paunipagar
- Department of Radiology, Akshay PET-CT, Akshay CT, Sai MRI Scans, Sangli, India ,Department of Radiology, Akshay CT and Sai MRI Scans, Sangli, Kolhapur India
| | - Darshana Rasalkar
- Department of Radiology, Akshay PET-CT, Akshay CT, Sai MRI Scans, Sangli, India ,Department of Radiology, Akshay CT and Sai MRI Scans, Sangli, Kolhapur India
| | - Kshitij Chaudhary
- grid.465035.1Department of Orthopaedics, Sir HN Reliance Foundation Hospital, Mumbai, India
| | - Vaibhav Bagaria
- grid.465035.1Department of Orthopaedics, Sir HN Reliance Foundation Hospital, Mumbai, India
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Qi Y, Zhang F, Fang C, Liu C. Dynamics of the surface thermal landscape ( STL) in northern slope of central Tianshan mountains, Xinjiang, NW China from 2000 to 2018. Environ Sci Pollut Res Int 2020; 27:22033-22045. [PMID: 32285396 DOI: 10.1007/s11356-020-08556-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Accepted: 03/23/2020] [Indexed: 06/11/2023]
Abstract
Using the 2000-2018 MODIS Land Surface Temperature (LST) data and taking 11 cities (counties) in the northern slope of the central Tianshan Mountains in northwestern China as the study area, the spatial-temporal characteristics, landscape indices, centroid, and geo-information Tupu (carto-methodology in geo-information, CMGI) of surface thermal landscape (STL) were analyzed, and the paper draws the following results: (1) There are great differences in the diurnal and seasonal STL. The higher thermal levels are distributed more northerly in spring, summer, and autumn, and more southerly in winter. (2) In terms of class type level and landscape level, different landscape indices show different characteristics in diurnal and seasonal thermal landscapes. (3) Centroids at different thermal levels during the daytime are more dispersed than at nighttime in spring and summer, while the opposite is found in autumn. In winter, centroids of different thermal levels are concentrated in the southern and central-southern regions. During the period of 2000-2018, centroids of different thermal levels tend to move with the varying of STL. (4) The whole STL in same seasons changed little, transition usually happens between adjacent thermal levels. Overall, compared with the eastern monsoon area, there are similarities and differences in the characteristics of the STL.
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Affiliation(s)
- Yaxiao Qi
- Key Laboratory of Wisdom City and Environment Modeling of Higher Education Institute, College of Resources and Environment Sciences, Xinjiang University, Urumqi, 830046, China
- Key Laboratory of Oasis Ecology, Xinjiang University, Urumqi, 830046, China
| | - Fei Zhang
- Key Laboratory of Wisdom City and Environment Modeling of Higher Education Institute, College of Resources and Environment Sciences, Xinjiang University, Urumqi, 830046, China.
- Key Laboratory of Oasis Ecology, Xinjiang University, Urumqi, 830046, China.
- Engineering Research Center of Central Asia Geoinformation Development and Utilization, National Administration of Surveying, Mapping and Geoinformation, Urumqi, 830002, China.
| | - Chuanglin Fang
- Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China
| | - Changjiang Liu
- Key Laboratory of Wisdom City and Environment Modeling of Higher Education Institute, College of Resources and Environment Sciences, Xinjiang University, Urumqi, 830046, China
- Key Laboratory of Oasis Ecology, Xinjiang University, Urumqi, 830046, China
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Abstract
This article is a guide to starting a 3-dimensional (3-D) print laboratory; 3-D models of complicated foot and ankle pathology can enhance surgical planning, improve patient and medical trainee education, and aid in research. This article discusses the variables that must be considered when creating a 3-D printing laboratory, including the hardware, software, printing materials, and procedures. Herein is a basic outline of what is required to develop a foot and ankle 3-D printing laboratory.
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Affiliation(s)
- Collin E Pehde
- College of Podiatric Medicine and Surgery, Des Moines University, 3200 Grand Avenue, Des Moines, IA 50312, USA.
| | - John Bennett
- College of Podiatric Medicine and Surgery, Des Moines University, 3200 Grand Avenue, Des Moines, IA 50312, USA
| | - Brad Lee Peck
- College of Podiatric Medicine and Surgery, Des Moines University, 3200 Grand Avenue, Des Moines, IA 50312, USA
| | - Logan Gull
- College of Podiatric Medicine and Surgery, Des Moines University, 3200 Grand Avenue, Des Moines, IA 50312, USA
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Storelli S, Palandrani G, Amorfini L, Scanferla M, Ausenda F, Romeo E. A digital workflow for computer-guided implant surgery integrating CBCT, model scanning, and CAD/CAM for a complete edentulism implant-supported prosthesis: a technique procedure. Int J Comput Dent 2020; 23:269-279. [PMID: 32789314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The utilization of digital 3D surface images (STL format) for planning cases of computer-guided implant surgery is very useful in partially edentulous cases. In fully edentulous cases, however, the absence of teeth makes it necessary to add reference markers. The proposed protocol demonstrates a simple procedure that allows for the superimposition of STL and radiologic data (DICOM format). In the presented patient case, the tissue-bearing area of the prosthesis was relined with a polysulfide impression material and sent to the laboratory. A master cast was produced. The prosthesis was relined to improve intraoral stability and was provided with at least three radiopaque 3D markers. An STL copy of the prosthesis and the model was generated through a laboratory scanner. The patient wore the prosthesis with the attached markers during the 3D radiologic examination. In the planning software (CoDiagnostiX; Dental Wings), the prosthesis markers on the STL were matched to the corresponding markers visible on the DICOM data. Then, the STL of the model was matched to that of the prosthesis. Once the STL of the mucosa and the prosthesis were imported into the software, new possibilities arose, ie, the option to add other digital or traditional tooth setups to the same radiologic data or to design a surgical guide based on the actual mucosa of the patient.
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Tong X, Wang X, Li Z, Yang P, Zhao M, Xu K. Trend analysis and modeling of nutrient concentrations in a preliminary eutrophic lake in China. Environ Monit Assess 2019; 191:365. [PMID: 31089888 DOI: 10.1007/s10661-019-7394-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Accepted: 03/13/2019] [Indexed: 06/09/2023]
Abstract
Accurately measuring and estimating trends and variations in nutrient levels is a significant part of managing emerging eutrophic lakes in developing countries. This study developed an integrated approach containing Seasonal Trend Decomposition using Loess (STL) and a dynamic nonlinear autoregressive model with exogenous input (NARX) network to decompose and estimate the nutrient concentrations in Lake Erhai, a preliminary eutrophic lake in China. The STL decomposition results indicated that total nitrogen (TN) concentration of Lake Erhai progressively descended from 2006 to 2014, except for some agriculture area. The total phosphorus (TP) concentration showed an increasing trend from 2006 to 2013 and then decreased in 2014, but in the area near the tourist attractions, TP increased continuously from 2011 to 2014. Seasonal variations in TN and TP indicated that the lowest water quality of Lake Erhai occurred from July to October. Based on results obtained with STL, TP was selected as the sensitive parameter, as it showed a significant deterioration trend, and the area near the tourist attractions was selected as the sensitive area. Three variables (DO, pH, and water temperature) were selected as input parameters to estimate TP using the dynamic NARX model. The NARX modeling results demonstrated that it can accurately estimate TP concentrations with low root-mean-square error (0.0071 mg/L). The study establishes a new approach to better understand trends and variations in nutrient levels and to better refine estimates by identifying more easily accessible physical parameters in a preliminary eutrophic lake.
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Affiliation(s)
- Xinnan Tong
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Rd, Shanghai, 200240, China
| | - Xinze Wang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Rd, Shanghai, 200240, China.
| | - Zekun Li
- Dali Environmental Monitoring Station, Dali, 671000, Yunnan, China
| | - Pingping Yang
- Dali Environmental Monitoring Station, Dali, 671000, Yunnan, China
| | - Ming Zhao
- Dali Environmental Monitoring Station, Dali, 671000, Yunnan, China
| | - Kaiqin Xu
- Research Center for Material Cycles and Waste Management, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
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Pankowski F, Paśko S, Max A, Szal B, Dzierzęcka M, Gruszczyńska J, Szaro P, Gołębiowski M, Bartyzel BJ. Computed tomographic evaluation of cleft palate in one-day-old puppies. BMC Vet Res 2018; 14:316. [PMID: 30342508 PMCID: PMC6195986 DOI: 10.1186/s12917-018-1642-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Accepted: 10/05/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Cleft palate is a birth defect characterized by a lack of fusion between structures forming the palate. Causes include a multitude of factors, both genetic and environmental. Computed tomography (CT) is widely used to evaluate morphological features and diagnose head disorders in adult dogs. However, there is less data about its use in neonatal dogs. The purpose of this study was to perform CT evaluation of palatal defects in one-day-old puppies and to present a novel approach of 3D modeling in terms of cleft palate assessment. RESULTS Macroscopic and CT examinations were performed in 23 stillborn or euthanized purebred newborn puppies. On the basis of CT data, a 3D model was prepared and the cleft surface area was then calculated. A multi-stage approach, which utilised software such as 3D Slicer and Blender, was applied. Palatal defects were found in ten dogs, of which five had cleft palate, three had bilateral cleft lip and palate, one had a unilateral cleft lip and palate and one had a unilateral cleft lip. The surface area of the clefts ranged from 31 to 213 mm2, which made up respectfully 11 to 63% of the total surface area of the palate. No abnormalities were found in thirteen dogs and they made up the control group. CONCLUSIONS Computed tomography and 3D modeling were very effective in evaluation of palatal disorders in newborn dogs. 3D models adapted to the natural curvature of the palate were created and more precise data was obtained. Morphological characteristics, CT findings and advanced image analysis of cleft palate in neonates obtained from these models increase the knowledge about this malformation in dogs.
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Affiliation(s)
- Filip Pankowski
- Department of Morphological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences - SGGW, Warsaw, Poland
| | - Sławomir Paśko
- Virtual Reality Techniques Division, Institute of Micromechanics and Photonics, Faculty of Mechatronics, Warsaw University of Technology, Warsaw, Poland
| | - Andrzej Max
- Department of Small Animal Diseases with Clinic, Faculty of Veterinary Medicine, Warsaw University of Life Sciences - SGGW, Warsaw, Poland
| | - Bartłomiej Szal
- Department of Morphological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences - SGGW, Warsaw, Poland
| | - Małgorzata Dzierzęcka
- Department of Morphological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences - SGGW, Warsaw, Poland
| | - Joanna Gruszczyńska
- Department of Genetics and Animal Breeding, Faculty of Animal Sciences, Warsaw University of Life Sciences - SGGW, Warsaw, Poland
| | - Paweł Szaro
- 1st Department of Radiology, Medical University of Warsaw, Warsaw, Poland
| | - Marek Gołębiowski
- 1st Department of Radiology, Medical University of Warsaw, Warsaw, Poland
| | - Bartłomiej Jan Bartyzel
- Department of Morphological Sciences, Faculty of Veterinary Medicine, Warsaw University of Life Sciences - SGGW, Warsaw, Poland.
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Townsend K, Pietila T. 3D printing and modeling of congenital heart defects: A technical review. Birth Defects Res 2018; 110:1091-1097. [PMID: 30063112 DOI: 10.1002/bdr2.1342] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Accepted: 04/13/2018] [Indexed: 11/07/2022]
Abstract
Use of 3D printing technology is expanding in healthcare. One of the common applications is the creation of anatomical models of congenital heart defects (CHD) from medical image data. These patient-specific models are being used for multiple purposes including visualization of anatomy, simulation of surgical procedures, patient education, and facilitating communication between clinical staff. The process for creating CHD models begins with acquiring volumetric image data that is segmented using medical image processing software. A virtual 3D model is calculated based on the segmented data which can be further refined using computer-aided design software. Last, the virtual model is transferred to a 3D printer for production. By obtaining detailed knowledge on the process for creating patient-specific CHD anatomical models, institutions can implement the technology in an efficient and cost-effective manner.
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García-Mozo H, Oteros JA, Galán C. Impact of land cover changes and climate on the main airborne pollen types in Southern Spain. Sci Total Environ 2016; 548-549:221-228. [PMID: 26802350 DOI: 10.1016/j.scitotenv.2016.01.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Revised: 12/17/2015] [Accepted: 01/04/2016] [Indexed: 05/21/2023]
Abstract
Airborne pollen concentrations strongly correlate with flowering intensity of wind-pollinated species growing at and around monitoring sites. The pollen spectrum, and the variations in its composition and concentrations, is influenced by climatic features and by available nutritional resources but it is also determined by land use and its changes. The first factor influence is well known on aerobiological researches but the impact of land cover changes has been scarcely studied until now. This paper reports on a study carried out in Southern Spain (Córdoba city) examining airborne pollen trends over a 15-year period and it explores the possible links both to changes in land use and to climate variations. The Seasonal-Trend Decomposition procedure based on Loess (STL) which decomposes long-term data series into smaller seasonal component patterns was applied. Trends were compared with recorded changes in land use at varying distances from the city in order to determine their possible influence on pollen-count variations. The influence of climate-related factors was determined by means of non-parametric correlation analysis. The STL method proved highly effective for extracting trend components from pollen time series, because their features vary widely and can change quickly in a short term. Results revealed mixed trends depending on the taxa and reflecting fluctuations in land cover and/or climate. A significant rising trend in Olea pollen counts was observed, attributable both to the increasing olive-growing area but also to changes in temperature and rainfall. Poaceae pollen concentrations also increased, due largely to an expansion of heterogeneous agricultural areas and to an increase in pollen season length positively influenced by rainfall and temperature. By contrast, the significant declining trend observed for pollen from ruderal taxa, such as Amaranthaceae, Rumex, Plantago and Urticaceae, may be linked to changes in urban planning strategies with a higher building pressure.
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Affiliation(s)
- Herminia García-Mozo
- Department of Botany, Ecology and Plant Physiology, University of Córdoba, Spain.
| | - Jose Antonio Oteros
- Department of Botany, Ecology and Plant Physiology, University of Córdoba, Spain; Center of Allergy & Environment (ZAUM), Helmholtz Zentrum München, Technische Universität München, Germany
| | - Carmen Galán
- Department of Botany, Ecology and Plant Physiology, University of Córdoba, Spain
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Abstract
We have developed a GPU-accelerated SPECT system simulator that integrates into instrument-design workflow [1]. This simulator includes a gamma-ray tracing module that can rapidly propagate gamma-ray photons through arbitrary apertures modeled by SolidWorks TM -created stereolithography (.STL) representations with a full complement of physics cross sections [2, 3]. This software also contains a scintillation detector simulation module that can model a scintillation detector with arbitrary scintillation crystal shape and light-sensor arrangement. The gamma-ray tracing module enables us to efficiently model aperture and detector crystals in SolidWorks TM and save them as STL file format, then load the STL-format model into this module to generate list-mode results of interacted gamma-ray photon information (interaction positions and energies) inside the detector crystals. The Monte-Carlo scintillation detector simulation module enables us to simulate how scintillation photons get reflected, refracted and absorbed inside a scintillation detector, which contributes to more accurate simulation of a SPECT system.
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Affiliation(s)
- Xin Li
- Center for Gamma-Ray Imaging and College of Optical Sciences, University of Arizona, Tucson, AZ 85724, USA
| | - Lars R Furenlid
- Center for Gamma-Ray Imaging and College of Optical Sciences, University of Arizona, Tucson, AZ 85724, USA
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Huotilainen E, Jaanimets R, Valášek J, Marcián P, Salmi M, Tuomi J, Mäkitie A, Wolff J. Inaccuracies in additive manufactured medical skull models caused by the DICOM to STL conversion process. J Craniomaxillofac Surg 2013; 42:e259-65. [PMID: 24268714 DOI: 10.1016/j.jcms.2013.10.001] [Citation(s) in RCA: 128] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Revised: 07/08/2013] [Accepted: 10/08/2013] [Indexed: 11/28/2022] Open
Abstract
INTRODUCTION The process of fabricating physical medical skull models requires many steps, each of which is a potential source of geometric error. The aim of this study was to demonstrate inaccuracies and differences caused by DICOM to STL conversion in additively manufactured medical skull models. MATERIAL AND METHODS Three different institutes were requested to perform an automatic reconstruction from an identical DICOM data set of a patients undergoing tumour surgery into an STL file format using their software of preference. The acquired digitized STL data sets were assessed and compared and subsequently used to fabricate physical medical skull models. The three fabricated skull models were then scanned, and differences in the model geometries were assessed using established CAD inspection software methods. RESULTS A large variation was noted in size and anatomical geometries of the three physical skull models fabricated from an identical (or "a single") DICOM data set. CONCLUSIONS A medical skull model of the same individual can vary markedly depending on the DICOM to STL conversion software and the technical parameters used. Clinicians should be aware of this inaccuracy in certain applications.
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Affiliation(s)
- Eero Huotilainen
- BIT Research Centre, Department of Industrial Engineering and Management, School of Science and Technology, Aalto University, P.O. Box 15500, FI-00076 Helsinki, Finland
| | - Risto Jaanimets
- Oral and Maxillofacial Unit, Department of Otorhinolaryngology, Tampere University Hospital, P.O. Box 2000, FI-33521 Tampere, Finland; Medical Imaging Center, Department of Radiology, Tampere University Hospital, P.O. Box 2000, FI-33521 Tampere, Finland.
| | - Jiří Valášek
- Institute of Solid Mechanics, Mechatronics and Biomechanics, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, 616 69 Brno, Czech Republic
| | - Petr Marcián
- Institute of Solid Mechanics, Mechatronics and Biomechanics, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, 616 69 Brno, Czech Republic
| | - Mika Salmi
- BIT Research Centre, Department of Industrial Engineering and Management, School of Science and Technology, Aalto University, P.O. Box 15500, FI-00076 Helsinki, Finland
| | - Jukka Tuomi
- BIT Research Centre, Department of Industrial Engineering and Management, School of Science and Technology, Aalto University, P.O. Box 15500, FI-00076 Helsinki, Finland
| | - Antti Mäkitie
- BIT Research Centre, Department of Industrial Engineering and Management, School of Science and Technology, Aalto University, P.O. Box 15500, FI-00076 Helsinki, Finland; Dept. of Otolaryngology - Head & Neck Surgery, Helsinki University Hospital and University of Helsinki, P.O. Box 220, FI-00029 Helsinki, Finland
| | - Jan Wolff
- Oral and Maxillofacial Unit, Department of Otorhinolaryngology, Tampere University Hospital, P.O. Box 2000, FI-33521 Tampere, Finland; Medical Imaging Center, Department of Radiology, Tampere University Hospital, P.O. Box 2000, FI-33521 Tampere, Finland
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Zhang L, Sedykh A, Tripathi A, Zhu H, Afantitis A, Mouchlis VD, Melagraki G, Rusyn I, Tropsha A. Identification of putative estrogen receptor-mediated endocrine disrupting chemicals using QSAR- and structure-based virtual screening approaches. Toxicol Appl Pharmacol 2013; 272:67-76. [PMID: 23707773 PMCID: PMC3775906 DOI: 10.1016/j.taap.2013.04.032] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Revised: 04/16/2013] [Accepted: 04/17/2013] [Indexed: 12/24/2022]
Abstract
Identification of endocrine disrupting chemicals is one of the important goals of environmental chemical hazard screening. We report on the development of validated in silico predictors of chemicals likely to cause estrogen receptor (ER)-mediated endocrine disruption to facilitate their prioritization for future screening. A database of relative binding affinity of a large number of ERα and/or ERβ ligands was assembled (546 for ERα and 137 for ERβ). Both single-task learning (STL) and multi-task learning (MTL) continuous quantitative structure-activity relationship (QSAR) models were developed for predicting ligand binding affinity to ERα or ERβ. High predictive accuracy was achieved for ERα binding affinity (MTL R(2)=0.71, STL R(2)=0.73). For ERβ binding affinity, MTL models were significantly more predictive (R(2)=0.53, p<0.05) than STL models. In addition, docking studies were performed on a set of ER agonists/antagonists (67 agonists and 39 antagonists for ERα, 48 agonists and 32 antagonists for ERβ, supplemented by putative decoys/non-binders) using the following ER structures (in complexes with respective ligands) retrieved from the Protein Data Bank: ERα agonist (PDB ID: 1L2I), ERα antagonist (PDB ID: 3DT3), ERβ agonist (PDB ID: 2NV7), and ERβ antagonist (PDB ID: 1L2J). We found that all four ER conformations discriminated their corresponding ligands from presumed non-binders. Finally, both QSAR models and ER structures were employed in parallel to virtually screen several large libraries of environmental chemicals to derive a ligand- and structure-based prioritized list of putative estrogenic compounds to be used for in vitro and in vivo experimental validation.
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Affiliation(s)
- Liying Zhang
- Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, NC
| | - Alexander Sedykh
- Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, NC
| | - Ashutosh Tripathi
- Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, NC
| | - Hao Zhu
- The Rutgers Center for Computational and Integrative Biology, Rutgers University, Camden, NJ
- Department of Chemistry, Rutgers University, Camden, NJ
| | | | | | | | - Ivan Rusyn
- Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, NC
| | - Alexander Tropsha
- Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, NC
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Zimmermann S, Oufir M, Leroux A, Krauth-Siegel RL, Becker K, Kaiser M, Brun R, Hamburger M, Adams M. Cynaropicrin targets the trypanothione redox system in Trypanosoma brucei. Bioorg Med Chem 2013; 21:7202-9. [PMID: 24080104 DOI: 10.1016/j.bmc.2013.08.052] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2013] [Revised: 08/16/2013] [Accepted: 08/23/2013] [Indexed: 11/19/2022]
Abstract
In mice cynaropicrin (CYN) potently inhibits the proliferation of Trypanosoma brucei-the causative agent of Human African Trypanosomiasis-by a so far unknown mechanism. We hypothesized that CYNs α,β-unsaturated methylene moieties act as Michael acceptors for glutathione (GSH) and trypanothione (T(SH)2), the main low molecular mass thiols essential for unique redox metabolism of these parasites. The analysis of this putative mechanism and the effects of CYN on enzymes of the T(SH)2 redox metabolism including trypanothione reductase, trypanothione synthetase, glutathione-S-transferase, and ornithine decarboxylase are shown. A two step extraction protocol with subsequent UPLC-MS/MS analysis was established to quantify intra-cellular CYN, T(SH)2, GSH, as well as GS-CYN and T(S-CYN)2 adducts in intact T. b. rhodesiense cells. Within minutes of exposure to CYN, the cellular GSH and T(SH)2 pools were entirely depleted, and the parasites entered an apoptotic stage and died. CYN also showed inhibition of the ornithine decarboxylase similar to the positive control eflornithine. Significant interactions with the other enzymes involved in the T(SH)2 redox metabolism were not observed. Alongside many other biological activities sesquiterpene lactones including CYN have shown antitrypanosomal effects, which have been postulated to be linked to formation of Michael adducts with cellular nucleophiles. Here the interaction of CYN with biological thiols in a cellular system in general, and with trypanosomal T(SH)2 redox metabolism in particular, thus offering a molecular explanation for the antitrypanosomal activity is demonstrated. At the same time, the study provides a novel extraction and analysis protocol for components of the trypanosomal thiol metabolism.
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Affiliation(s)
- Stefanie Zimmermann
- Department of Pharmaceutical Sciences, University of Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland; Department of Medical Parasitology and Infection Biology, Swiss Tropical and Public Health Institute, Basel, Switzerland
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Velázquez-Domínguez J, Marchat LA, López-Camarillo C, Mendoza-Hernández G, Sánchez-Espíndola E, Calzada F, Ortega-Hernández A, Sánchez-Monroy V, Ramírez-Moreno E. Effect of the sesquiterpene lactone incomptine A in the energy metabolism of Entamoeba histolytica. Exp Parasitol 2013; 135:503-10. [PMID: 23994114 DOI: 10.1016/j.exppara.2013.08.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Revised: 08/14/2013] [Accepted: 08/21/2013] [Indexed: 10/26/2022]
Abstract
Entamoeba histolytica is the causative agent of human amoebiasis, which mainly affects developing countries. Although several drugs are effective against E. histolytica trophozoites, the control of amoebiasis requires the development of new and better alternative therapies. Medicinal plants have been the source of new molecules with remarkable antiprotozoal activity. Incomptine A isolated from Decachaeta incompta leaves, is a sesquiterpene lactone of the heliangolide type which has the major in vitro activity against E. histolytica trophozoites. However the molecular mechanisms involved in its antiprotozoal activity are still unknown. Using a proteomic approach based on two-dimensional gel electrophoresis and mass spectrometry (ESI-MS/MS) analysis, we evidenced that 21 E. histolytica proteins were differentially expressed in response to incomptine A treatment. Notably, three glycolytic enzymes, namely enolase, pyruvate:ferredoxin oxidoreductase and fructose-1,6-biphosphate aldolase, were down-regulated. Moreover, ultrastructural analysis of trophozoites through electronic microscopy showed an increased number of glycogen granules. Taken together, our data suggested that incomptine A could affect E. histolytica growth through alteration of its energy metabolism.
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Affiliation(s)
- José Velázquez-Domínguez
- Posgrado en Biomedicina Molecular, ENMyH, Instituto Politécnico Nacional, México City 07320, Mexico
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Tam MD, Laycock SD, Jayne D, Babar J, Noble B. 3-D printouts of the tracheobronchial tree generated from CT images as an aid to management in a case of tracheobronchial chondromalacia caused by relapsing polychondritis. J Radiol Case Rep 2013; 7:34-43. [PMID: 24421951 DOI: 10.3941/jrcr.v7i8.1390] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
This report concerns a 67 year old male patient with known advanced relapsing polychondritis complicated by tracheobronchial chondromalacia who is increasingly symptomatic and therapeutic options such as tracheostomy and stenting procedures are being considered. The DICOM files from the patient's dynamic chest CT in its inspiratory and expiratory phases were used to generate stereolithography (STL) files and hence print out 3-D models of the patient's trachea and central airways. The 4 full-sized models allowed better understanding of the extent and location of any stenosis or malacic change and should aid any planned future stenting procedures. The future possibility of using the models as scaffolding to generate a new cartilaginous upper airway using regenerative medical techniques is also discussed.
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Affiliation(s)
- Matthew David Tam
- Department of Radiology, Southend University Hospital NHS Foundation, Westcliff-on-Sea, Essex, UK ; P ostgraduate Medical Institute, Anglia Ruskin University, Chelmsford, Essex, UK
| | - Stephen David Laycock
- East Anglian Radiography Research, Modelling and 3-D Printing Group, University Campus Suffolk, UK ; School of Computing Sciences, University of East Anglia, Norwich, UK
| | - David Jayne
- Department of Clinical Medicine, Addenbrookes Hospital NHS Trust, Cambridge, UK
| | - Judith Babar
- Department of Clinical Radiology, Addenbrookes Hospital NHS Trust, Cambridge, UK
| | - Brendon Noble
- School of Science, Technology and Health, University Campus Suffolk, Ipswich, UK
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