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Correlating the hydraulic conductivities of GCLs with some properties of bentonites
Oren, A. Hakan,Aksoy, Yeliz Yukselen,Onal, Okan,Demirkiran, Havva Techno-Press 2018 Geomechanics & engineering Vol.15 No.5
In this study, the relationships between hydraulic conductivity of GCLs and physico-chemical properties of bentonites were assessed. In addition to four factory manufactured GCLs, six artificially prepared GCLs (AP-GCLs) were tested. AP-GCLs were prepared in the laboratory without bonding or stitching. A total of 20 hydraulic conductivity tests were conducted using flexible wall permeameters ten of which were permeated with distilled deionized water (DIW) and the rest were permeated with tap water (TW). The hydraulic conductivity of GCLs and AP-GCLs were between $5.2{\times}10^{-10}cm/s$ and $3.0{\times}10^{-9}cm/s$. The hydraulic conductivities of all GCLs to DIW were very similar to that of GCLs to TW. Then, simple regression analyses were conducted between hydraulic conductivity and physicochemical properties of bentonite. The best correlation coefficient was achieved when hydraulic conductivity was related with clay content (R=0.85). Liquid limit and plasticity index were other independent variables that have good correlation coefficients with hydraulic conductivity (R~0.80). The correlation coefficient with swell index is less than other parameters, but still fairly good (R~0.70). In contrast, hydraulic conductivity had poor correlation coefficients with specific surface area (SSA), smectite content and cation exchange capacity (CEC) (i.e., R < 0.5). Furthermore, some post-test properties of bentonite such as final height and final water content were correlated with the hydraulic conductivity as well. The hydraulic conductivity of GCLs had fairly good correlation coefficients with either final height or final water content. However, those of AP-GCLs had poor correlations with these variables on account of fiber free characteristics.
The Effect of Breast Hypertrophy on Patient Posture
Oren Lapid,E Joline de Groof,Leonard UMC Corion,Mark JC Smeulders,Chantal MAM van der Horst 대한성형외과학회 2013 Archives of Plastic Surgery Vol.40 No.5
Background One of the reasons women with macromastia chose to undergo a breast reduction is to relieve their complaints of back, neck, and shoulder pain. We hypothesized that changes in posture after surgery may be the reason for the pain relief and that patient posture may correlate with symptomatic macromastia and may serve as an objective measure for complaints. The purpose of our study was to evaluate the effect of reduction mammaplasty on the posture of women with macromastia. Methods A prospective controlled study at a university medical center. Forty-two patients that underwent breast reduction were studied before surgery and an average of 4.3 years following surgery. Thirty-seven healthy women served as controls. Standardized lateral photos were taken. The inclination angle of the back was measured. Regression analysis was performed for the inclination angle. Results Preoperatively, the mean inclination angle was 1.61 degrees ventrally; this diminished postoperatively to 0.72 degrees ventrally. This change was not significant (P-value=0.104). In the control group that angle was 0.28 degrees dorsally. Univariate regression analysis revealed that the inclination was dependent on body mass index (BMI) and having symptomatic macromastia;on multiple regression it was only dependent on BMI. Conclusions The inclination angle of the back in breast reduction candidates is significantly different from that of controls; however, this difference is small and probably does not account for the symptoms associated with macromastia. Back inclination should not be used as a surrogate “objective” measure for symptomatic macromastia.
Three-dimensional intraoperative computed tomography imaging for zygomatic fracture repair
Oren Peleg,Clariel Ianculovici,Amir Shuster,Eitan Mijiritsky,Itay Oz,Shlomi Kleinman 대한구강악안면외과학회 2021 대한구강악안면외과학회지 Vol.47 No.5
Objectives: Zygomatic complex (ZMC) fractures comprise up to 40% of all facial fractures. Misaligned bone fragments and misplaced fixation hardware traditionally detected postoperatively on plain radiographs of the skull might require re-operation. The intraoperative O-Arm (Medtronic, USA) is a three-dimensional (3D) computed tomographic imaging system. Materials and Methods: This retrospective single-center study evaluated the utility of O-Arm scanning during corrective surgeries for ZMC and zygomatic arch (ZA) fractures from 2018 to 2020. Three females and 16 males (mean age, 31.52 years; range, 22-48 years) were included. Fracture instability (n=6) and facial deformity (n=15) were the most frequent indications for intraoperative 3D O-Arm scan. Results: The images demonstrated that all fracture lines were properly reduced and fixed. Another scan performed at the end of the fixation or reduction stage, however, revealed suboptimal results in five of the 19 cases, and further reduction and fixation of the fracture lines were required. Conclusion: Implementation of an intraoperative O-Arm system in ZMC and ZA fracture surgeries assists in obtaining predictable and accurate results and obviates the need for revision surgeries. The device should be considered for precise operations such as ZMC fracture repairs.
The Effect of Breast Hypertrophy on Patient Posture
Lapid, Oren,de Groof, E. Joline,Corion, Leonard U.M.C.,Smeulders, Mark J.C.,van der Horst, Chantal M.A.M. Korean Society of Plastic and Reconstructive Surge 2013 Archives of Plastic Surgery Vol.40 No.5
Background One of the reasons women with macromastia chose to undergo a breast reduction is to relieve their complaints of back, neck, and shoulder pain. We hypothesized that changes in posture after surgery may be the reason for the pain relief and that patient posture may correlate with symptomatic macromastia and may serve as an objective measure for complaints. The purpose of our study was to evaluate the effect of reduction mammaplasty on the posture of women with macromastia. Methods A prospective controlled study at a university medical center. Forty-two patients that underwent breast reduction were studied before surgery and an average of 4.3 years following surgery. Thirty-seven healthy women served as controls. Standardized lateral photos were taken. The inclination angle of the back was measured. Regression analysis was performed for the inclination angle. Results Preoperatively, the mean inclination angle was 1.61 degrees ventrally; this diminished postoperatively to 0.72 degrees ventrally. This change was not significant (P-value=0.104). In the control group that angle was 0.28 degrees dorsally. Univariate regression analysis revealed that the inclination was dependent on body mass index (BMI) and having symptomatic macromastia; on multiple regression it was only dependent on BMI. Conclusions The inclination angle of the back in breast reduction candidates is significantly different from that of controls; however, this difference is small and probably does not account for the symptoms associated with macromastia. Back inclination should not be used as a surrogate "objective" measure for symptomatic macromastia.
Halobacterium salinarum Strain MMD047 -A Low-salt Adapted Member of the Halobacteriaceae?
Aharon Oren,Antonio Ventosa 한국생물공학회 2009 Biotechnology and Bioprocess Engineering Vol.14 No.6
In a paper recently in Biotechnology and Bioprocess Engineering (vol. 14, pp. 67-75), Shanmughapriya and coworkers described a prokaryote (strain MMD047) isolated from a marine sponge, which they classified as a strain of Halo-bacterium salinarum. As the strain grows at low salinity only, its behavior is greatly different from that of other Halo-bacterium isolates . In spite of multiple requests, the strain has not been made available for further studies and we therefore call upon the authors of the paper to release their interesting isolate for an in-depth taxonomic characterization In a paper recently in Biotechnology and Bioprocess Engineering (vol. 14, pp. 67-75), Shanmughapriya and coworkers described a prokaryote (strain MMD047) isolated from a marine sponge, which they classified as a strain of Halo-bacterium salinarum. As the strain grows at low salinity only, its behavior is greatly different from that of other Halo-bacterium isolates . In spite of multiple requests, the strain has not been made available for further studies and we therefore call upon the authors of the paper to release their interesting isolate for an in-depth taxonomic characterization
Use of ultra-low cost fitness trackers as clinical monitors in low resource emergency departments
Alon Dagan,Oren J Mechanic 대한응급의학회 2020 Clinical and Experimental Emergency Medicine Vol.7 No.3
In low resource hospitals, strained staffing ratios and lack of telemetry can put patients at risk for clinical deterioration and unexpected cardiac arrest. While traditional telemetry systems can provide real-time continuous vital signs, they are too expensive for widespread use in these settings. At the same time, developed countries such as the United States have been increasingly utilizing remote monitoring systems to shift patient care from hospital to home. While the context is dramatically different, the challenge of monitoring patients in otherwise unmonitored settings is the same. At-home monitoring solutions range from highly comprehensive and expensive systems to inexpensive fitness trackers. In the field of global health, the adoption of this technology has been somewhat limited. We believe that low cost fitness trackers present an opportunity to address the challenge of vital sign monitoring in resource-poor settings at a fraction of the cost of existing technical solutions.