Nanoporous inorganic materials from mineral templates

MacKenzie,K. Okada,J. Temuujin 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4

The crystal architecture of layer-lattice minerals has been used to prepare inorganic materials containing pores of closely con-trolled size and shape. The template minerals are activated, either bythermal or mechanical treatment, and selectivelyleached withacid to remove the octahedrally-coordinated component, or with alkali to remove the tetrahedral (silica) component. Some acid-leached products contain hydrophilic slit-shaped pores with narrow size distributions typically in the nanopore range, whereas thealkali-leached products contain unimodal pore distributions of larger size (23 nm). The leaching by-products have also been used toprepare combined anion and cation exchange material potentiallyuseful for simultaneous removal of PO.4 and NHþ4 from wastewaters.

Thermal Development from Hybrid Gels of Compounds for Use in Fibre-Reinforced Oxide Ceramics

MacKenzie, Kenneth J.D.,Kemmitt, Tim,Meinhold, Richard H.,Schmucker, Martin,Mayer, Lutz The Korean Ceramic Society 1998 The Korean journal of ceramics Vol.4 No.4

Mixed oxide compounds of potential usefulness for fibre coatings (hexagonal celsian, $BaAl_2Si_2O_8$ and lanthanum hexaluminate, $LaAl_{11}O_{18}$) or for matrix materials (yttrium aluminium garnet, $Y_3Al_5O_{12}$) were prepared by hybrid sol-gel synthesis and their thermal crystallisation was monitored by thermal analysis, X-ray diffraction and multinuclear solid state MAS NMR. All the gels convert to the crystalline phase below about $12200^{\circ}C$, via amorphous intermediates in which the Al shows and NMR resonance at 36-38 ppm sometimes ascribed to Al in 5-fold coordination. Additional information about the structural changes during thermal treatment was provided by $^{29}Si$, $^{137}Ba$ and $^{89}Y$ MAS NMR spectroscopy, showing that the feldspar framework of celsian begins to be established by about $500^{\circ}C$ but the Ba is still moving into its polyhedral lattice sites about $400^{\circ}C$ after the sluggish onset of crystallization. Lanthanum hexaluminate and YAG crystallise sharply at 1230 and $930^{\circ}C$ respectively, the former via $\gamma-Al_2O_3$, the latter via $YAlO_3$. Yttrium moves into the garnet lattice sites less than $100^{\circ}C$ after crystallisation.

Are there avoidable causes of early revision total knee arthroplasty?

( Mackenzie A. Roof ),( Jason B. Kreinces ),( Ran Schwarzkopf ),( Joshua C. Rozell ),( Vinay K. Aggarwal ) 대한슬관절학회 2022 대한슬관절학회지 Vol.34 No.-

Introduction: Surgeons can improve their practice by understanding potentially avoidable reasons for early revision total knee arthroplasty (rTKA). The purpose of this study is to describe potentially avoidable indications for rTKA within 5 years of the index procedure. Methods: This retrospective observational analysis utilized the rTKA database at a large, academic orthopedic specialty hospital to identify 167 consecutive rTKA from 2014 to 2019 performed within 5 years after primary TKA (pTKA). Two fellowship-trained arthroplasty surgeons reviewed the cases to classify them as potentially avoidable or unavoidable. Unavoidable indications for rTKA included infection/wound complication, arthrofibrosis, instability due to underlying collagen disease or significant weight loss, and any traumatic event leading to pTKA failure. Potentially avoidable indications included atraumatic instability, intraoperative fracture, metal allergy, and atraumatic patellar instability or maltracking. Aseptic loosening was considered avoidable if it occurred in the presence of component malpositioning or poor cementation technique. Results: There were 112 (67.1%) unavoidable cases and 55 avoidable cases (32.9%). Of the unavoidable cases, there were 68 rTKA for infection or wound complications (60.7%), 23 for arthrofibrosis (20.5%), 6 for instability (5.4%), 6 for postoperative fracture (5.4%), 6 for aseptic loosening (5.4%), and 3 for extensor mechanism pathology following trauma (2.6%). Of the potentially avoidable rTKA, 24 were for aseptic loosening (43.7%), 23 for atraumatic instability (41.8%), 6 for atraumatic extensor mechanism pathology (10.9%), 1 for nickel allergy (1.8%), and 1 for intraoperative fracture (1.8%). Conclusion: These findings indicate that over 30% of early rTKA are potentially avoidable. Interventions should focus on addressing potentially avoidable causes such as short-term aseptic loosening and instability to reduce the need for costly and resource-intensive rTKA. Level of evidence III, retrospective observational analysis

Prostaglandins : Has the Initial Promise been Realised?

MacKenzie, I.Z. Medical Publications Korea 1978 Medical Progress Vol.5 No.9

Impact of time to revision total knee arthroplasty on outcomes following aseptic failure

( Mackenzie A. Roof ),( Shankar Narayanan ),( Nathan Lorentz ),( Vinay K. Aggarwal ),( Morteza Meftah ),( Ran Schwarzkopf ) 대한슬관절학회 2023 대한슬관절학회지 Vol.35 No.-

Introduction Prior studies have demonstrated an association between time to revision total knee arthroplasty (rTKA) and indication; however, the impact of early versus late revision on post-operative outcomes has not been reported. Materials and methods A retrospective, observational study examined patients who underwent unilateral, aseptic rTKA at an academic orthopedic hospital between 6/2011 and 4/2020 with > 1-year of follow-up. Patients were early revisions if they were revised within 2 years of primary TKA (pTKA) or late revisions if revised after greater than 2 years. Patient demographics, surgical factors, and post-operative outcomes were compared. Results 470 rTKA were included (199 early, 271 late). Early rTKA patients were younger by 2.5 years (p = 0.002). The predominant indications for early rTKA were instability (28.6%) and arthrofibrosis/stiffness (26.6%), and the predominant indications for late rTKA were aseptic loosening (45.8%) and instability (26.2%; p < 0.001). Late rTKA had longer operative times (119.20 ± 51.94 vs. 103.93 ± 44.66 min; p < 0.001). There were no differences in rTKA type, disposition, hospital length of stay, all-cause 90-day emergency department visits and readmissions, reoperations, and number of re-revisions. Conclusions Aseptic rTKA performed before 2 years had different indications but demonstrated similar outcomes to those performed later. Early revisions had shorter surgical times, which could be attributed to differences in rTKA indication. Level of evidence III, retrospective observational analysis.

유도분만시 질 투여용 프로스타글란딘의 사용

Mackenzie, I.Z. 임상약학사 1993 臨床藥學 Vol.13 No.12

Do Faith-Based Foster Care Agencies Respond Equally to All Clients?

Mattie Mackenzie-Liu,David J. Schwegman,Leonard M. Lopoo 서울대학교행정대학원 2022 The Korean Journal of Policy Studies Vol.37 No.2

Recent laws and court rulings have increased legal protections for faith-based organizations that refuse to provide services to certain individuals based on deeply held religious beliefs. Using data from a 2019 email correspondence study, we examine if religiously-affiliated foster care agencies respond to inquiries from white same-sex couples differently from public and secular foster care agencies. This paper provides preliminary, descriptive results that public sector discrimination can vary by the type of organization that is providing the service. We find suggestive evidence that religiously-affiliated foster care agencies are less likely to respond to same-sex male couples. However, this study lacks sufficient statistical power to find conclusive evidence of differential treatment by type of organization, which highlights the challenges of conducting correspondence studies that examine intersectional discrimination. Despite this limitation, we argue that it is increasingly important for scholars of public administration and public policy to examine and understand how discrimination in the public sector may vary by group membership or organizational type. While exploring this intersectional discrimination may be limited in certain contexts, understanding how and why organizations and public servants are more or less likely to respond to particular groups is an important first step in designing interventions or crafting policies to reduce differential treatment.

Effective Treatment of Vaginal Discharge and NSU in the Female

Thomas Mackenzie Fiddes Medical Publications Korea 1974 Medical Progress Vol.1 No.11

The Rise, Fall and Return of Li-Ning

Ian Mackenzie,Máté Deutsch,Peter Koczerzat,Matthew Russell-Cheung Academy of Asian Business (AAB) 2016 Academy of Asian Business Review Vol.2 No.2

The purpose of this study is to analyse the factors that contributed to the rise, fall and return of Li-Ning in the Chinese sportswear and footwear market. The history of Li-Ning can be segmented into three main periods: its steady rise from humble beginnings from 1990 to 2008, its astronomical success experienced from 2008 to 2010 and its journey from demise to break even from 2011 to 2015. The second period, 2008 to 2010, serves as a lens to examining the strategic importance of brand positioning and innovative ‘guerrilla’ or ‘ambush’ marketing tactics to assert dominance in a highly competitive industry. These success factors illustrate that a company might not have the same budgets or international reach of incumbents, but it can capture attention and value through alternative methods. This practice can be adopted by smaller firms or startups battling incumbents for market share in different industries and countries. The third and most recent period, from 2012 to 2015, serves as a study in the importance of pragmatic, incremental brand repositioning and market consolidation. These two factors form the basis of our key takeaways from Li-Ning’s story. In addition, we will be analyzing the current 2016 market landscape and international/domestic competitors to form the basis of our recommendations to Li-Ning to bring it back to success.

Innovative Ideas in Management and Administration : The Process Approach to Multi-Level Organizational Behavior

( Kenneth D. Mackenzie ) 한국행정학회 2003 Bulletins et mémoires de la Societe d'Anthropologi Vol.2003 No.-