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Publication
Journal: Chemical Communications
January/2/2012
Abstract
We report here on an efficient one-step-impregnation method to synthesize crystalline mesoporous bimetal oxides (e.g. NiFe(2)O(4), CuFe(2)O(4), Cu/CeO(2)) using mesoporous silicas as hard templates under optimized mixing conditions. This new procedure enables a true replication of the mesostructure with high yield and phase purity, while retaining particle morphology of the template.
Publication
Journal: Environmental Science & Technology
March/27/2014
Abstract
The performances of fresh and sulfated MnOx-CeO₂ catalysts for selective catalytic reduction of NOx by NH₃ (NH₃-SCR) in a low-temperature range (T < 300 °C) were investigated. Characterization of these catalysts aimed at elucidating the role of additive and the effect of sulfation. The catalyst having a Sn:Mn:Ce = 1:4:5 molar ratio showed the widest SCR activity improvement with near 100% NOx conversion at 110-230 °C. Raman and X-ray photoelectron spectroscopy (XPS) indicated that Sn modification significantly increases the concentration of oxygen vacancies that may facilitate NO oxidation to NO₂. NH₃-TPD characterization showed that the low-temperature NH₃-SCR activity is well correlated with surface acidity for NH3 adsorption, which is also enhanced by Sn modification. Furthermore, as compared to MnOx-CeO₂, Sn-modified MnOx-CeO₂ showed remarkably improved tolerance to SO₂ sulfation and to the combined effect of SO₂ and H₂O. In the presence of SO₂ and H₂O, the Sn-modified MnOx-CeO₂ catalyst gave 62% and 94% NOx conversions as compared to 18% and 56% over MnOx-CeO₂ at temperatures of 110 and 220 °C, respectively. Sulfation of SnO₂-modified MnOx-CeO₂ may form Ce(III) sulfate that could enhance the Lewis acidity and improve NO oxidation to NO₂ during NH₃-SCR at T>> 200 °C.
Publication
Journal: Optics Express
October/8/2015
Abstract
We present the first direct carrier-envelope-offset (CEO) frequency detection of a modelocked laser based on supercontinuum generation (SCG) in a CMOS-compatible silicon nitride (Si(3)N(4)) waveguide. With a coherent supercontinuum spanning more than 1.5 octaves from visible to beyond telecommunication wavelengths, we achieve self-referencing of SESAM modelocked diode-pumped Yb:CALGO lasers using standard f-to-2f interferometry. We directly obtain without amplification strong CEO beat signals for both a 100-MHz and 1-GHz pulse repetition rate laser. High signal-to-noise ratios (SNR) of>> 25 dB and even>> 30 dB have been generated with only 30 pJ and 36 pJ of coupled pulse energy from the megahertz and gigahertz laser respectively. We compare these results to self-referencing using a commercial photonic crystal fiber and find that the required peak power for CEO beat detection with a comparable SNR is lowered by more than an order of magnitude when using a Si(3)N(4) waveguide.
Publication
Journal: International Journal of Molecular Sciences
August/18/2016
Abstract
The study aim was to test the applicability of pooling of nanomaterials-induced in vitro data for identifying the toxic capacity of specific (SiO₂, TiO₂, ZnO, CuO, CeO₂ and carbon nanotubes, [CNT]) nanoparticles (NP) and to test the usefulness for grouping purposes. Publication selection was based on specific criteria regarding experimental conditions. Two relevant biological endpoints were selected; generation of intracellular reactive oxygen species (ROS) and viability above 90%. The correlations of the ROS ratios with the NP parameters' size, concentration, and exposure time were analysed. The obtained data sets were then analysed with multiple regression analysis of variance (ANOVA) and the Tukey post-hoc test. The results show that this method is applicable for the selected metal oxide NP, but might need reconsideration and a larger data set for CNT. Several statistically significant correlations and results were obtained, thus validating the method. Furthermore, the relevance of the combination of ROS release with a cell viability test was shown. The data also show that it is advisable to compare ROS production of professional phagocytic with non-phagocytic cells. In conclusion, this is the first systematic analysis showing that pooling of available data into groups is a useful method for evaluation of data regarding NP induced toxicity in vitro.
Publication
Journal: Langmuir
July/12/2011
Abstract
To understand the ceria promotion effect of Pt-CeO(2)/C catalysts on methanol oxidation, microstructural and metal-oxide interactions of Pt-CeO(2)/C catalysts with an atomic ratio of Pt/Ce between 0.14 and 1.4 were systematically examined using high-resolution transmission electron microscopy and electron energy loss spectroscopy (EELS). With an increasing Pt content in the catalysts, Pt particles gradually invaded into the ceria supports and decoration on Pt particles was observed. Simultaneously, the morphology of the supports was dramatically modified with nanocrystalline and amorphous ceria formed between and/or around the Pt particles. It reveals that the Pt-ceria interaction could take place in the catalysts and the influence of the interaction was enhanced with an increasing Pt/Ce ratio. The EELS study demonstrated that the strong Pt-ceria interaction was related to the redox reaction between Pt and ceria. Experimental results also suggested that the strong interaction between Pt and ceria could contribute to the promotion effect of ceria on the oxidation of methanol.
Publication
Journal: Health Affairs
September/20/2004
Abstract
In 2002 Kaiser Permanente's board surprised the industry by reaching outside its organization and selecting a nonphysician leader, George C. Halvorson, then CEO of HealthPartners of Minneapolis. In this interview Halvorson talks about returning to Kaiser's strengths--its sixty-year-plus history of integrated health care organization and its power base along the Pacific Coast--and about how he and his physician colleagues intend to leverage clinical information technology to improve their subscribers' health. Halvorson also discusses the new Medicare prescription drug legislation, the sources of the current run-up in health costs, and how he intends to position Kaiser for future growth.
Publication
Journal: Harvard Business Review
December/19/2007
Abstract
Peachtree Healthcare has major IT infrastructure problems, and CEO Max Berndt is struggling to find the right fix. He can go with a single set of systems and applications that will provide consistency across Peachtree's facilities but may not give doctors enough flexibility. Or he can choose service-oriented architecture (SOA), a modular design that will allow Peachtree to standardize incrementally and selectively but poses certain risks as a newer technology. What should he do? Four experts comment on this fictional case study, authored by John P. Glaser, CIO for Partners HealthCare System. George C. Halvorson, the chairman and CEO of Kaiser Permanente, warns against using untested methodologies such as SOA in a health care environment, where lives are at stake. He says Peachtree's management must clarify its overall IT vision before devising a plan to achieve each of its objectives. Monte Ford, the chief information officer at American Airlines, says Peachtree can gradually replace its old systems with SOA. An incremental approach, he points out, would not only minimize risk but also enhance flexibility and control, and would allow IT to shift priorities along the way. Randy Heffner, a vice president at Forrester Research who focuses on technology architectures for computer-based business systems, thinks SOA's modular approach to business design would best meet Peachtree's need for flexibility. He says that Peachtree's CIO sees SOA as a new product category but should instead view it as a methodology. John A. Kastor, a professor at the University of Maryland School of Medicine, questions the goal of standardized care. He argues that it would be difficult to persuade doctors, many of whom are fiercely independent, to follow rigid patterns in their work.
Publication
Journal: Health and Social Care in the Community
July/22/2018
Abstract
Trauma in early childhood has been shown to adversely affect children's social, emotional, and physical development. Children living in out-of-home care (OoHC) have better outcomes when care providers are present for children, physically, psychologically, and emotionally. Unfortunately, the high turnover of out-of-home carers, due to vicarious trauma (frequently resulting in burnout and exhaustion) can result in a child's trauma being re-enacted during their placement in OoHC. Organisation-wide therapeutic care models (encompassing the whole organisation, from the CEO to all workers including administration staff) that are trauma-informed have been developed to respond to the complex issues of abuse and neglect experienced by children who have been placed in OoHC. These models incorporate a range of therapeutic techniques, and provide an overarching approach and common language that is employed across all levels of the organisation. The aim of this study was to investigate the current empirical evidence for organisation-wide, trauma-informed therapeutic care models in OoHC. A systematic review searching leading databases was conducted for evidence of organisation-wide, trauma-informed, out-of-home care studies, between 2002 and 2017. Seven articles were identified covering three organisational models. Three of the articles assessed the Attachment Regulation and Competency framework (ARC), one study assessed the Children and Residential Experiences programme (CARE), and three studies assessed The Sanctuary Model. Risk of bias was high in six of the seven studies. Only limited information was provided on the effectiveness of the models identified through this systematic review, although the evidence did suggest that trauma-informed care models may have significantly positive outcomes for children in OoHC. Future research should focus on evaluating components of trauma-informed care models and assessing the efficacy of the various organisational care models currently available.
Publication
Journal: International Journal of Food Microbiology
March/26/2017
Abstract
A Box-Behnken design was used to determine the effect of protein concentration (0, 5, or 10g of casein/100g), fat (0, 3, or 6g of corn oil/100g), aw (0.900, 0.945, or 0.990), pH (3.5, 5.0, or 6.5), concentration of cinnamon essential oil (CEO, 0, 200, or 400μL/kg) and incubation temperature (15, 25, or 35°C) on the growth of Aspergillus flavus during 50days of incubation. Mold response under the evaluated conditions was modeled by the modified Gompertz equation, logistic regression, and time-to-detection model. The obtained polynomial regression models allow the significant coefficients (p<0.05) for linear, quadratic and interaction effects for the Gompertz equation's parameters to be identified, which adequately described (R2>0.967) the studied mold responses. After 50days of incubation, every tested model system was classified according to the observed response as 1 (growth) or 0 (no growth), then a binary logistic regression was utilized to model A. flavus growth interface, allowing to predict the probability of mold growth under selected combinations of tested factors. The time-to-detection model was utilized to estimate the time at which A. flavus visible growth begins. Water activity, temperature, and CEO concentration were the most important factors affecting fungal growth. It was observed that there is a range of possible combinations that may induce growth, such that incubation conditions and the amount of essential oil necessary for fungal growth inhibition strongly depend on protein and fat concentrations as well as on the pH of studied model systems. The probabilistic model and the time-to-detection models constitute another option to determine appropriate storage/processing conditions and accurately predict the probability and/or the time at which A. flavus growth occurs.
Publication
Journal: Harvard Business Review
May/9/2007
Abstract
Senior leadership teams whose members play complementary roles have been chronicled as far back as Homer's account of the Trojan War: Although King Agamemnon commanded the Greek army, Achilles, Odysseus, and Nestor each played a distinct role in defeating Troy. Today, complementary-leadership structures are common and, in some cases, even institutionalized. Think of a CEO concerned mainly with external issues and a COO who focuses internally. The authors describe four kinds of complementarity: task, expertise, cognitive, and role. The two top executives at the software company Adobe Systems, for example, represent the second kind. As CEO, Bruce Chizen draws on his sales and marketing knowledge, while COO Shantanu Narayen adds his engineering and product development expertise. Roberto Goizueta, formerly the CEO of Coca-Cola, and Douglas Ivester, his COO (who later became CEO), were famous examples of the fourth type: Goizueta, the diplomat, maintained good relations with external stakeholders; Ivester, the warrior, drove the company to defeat the competition. Bringing together two or more people with complementary strengths can compensate for the natural limitations of each. But with the benefits comes the risk of confusion, disagreement about priorities, and turf battles. Leadership succession also presents substantial challenges, especially when a COO or president who has worked in a complementary fashion with the CEO moves into the top role. An organization's board of directors and CEO can manage the risks by fostering a shared vision, common incentives, communication, and trust. They can also ensure smooth succession processes in various ways, such as brokering a gradual transfer of responsibilities or allowing the CEO and the COO to share duties as long as they maintain the logic of complementarity.
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Publication
Journal: Journal of Ambulatory Care Management
June/16/2008
Abstract
We administered surveys to 100 chief executive officers (CEOs) of community health centers to determine their perceptions of the financial impact of the Health Disparities Collaboratives, a national quality improvement initiative. One third of the CEOs believed that the HDC had a negative financial impact on their health center, and this perception was significantly correlated with centers having a higher proportion of uninsured patients. Performance-based payment incentives may improve care but may also add new financial burdens to facilities that treat the uninsured population. As such, a provider's payer mix may need to be considered in the design of QI programs if they are to be sustainable.
Publication
Journal: Journal of Hazardous Materials
May/25/2019
Abstract
The main prerequisite of an active visible-light-driven photocatalyst is to effectively utilize the visible light to induce electron-hole (e-/h+) pairs of expanded lifetime. To this end, for the first time, the ternary heterojunctions of CeO2/Fe3O4 /Graphene oxide and Ce3+/ Fe3O4 /Graphene oxide (CeO2/Fe3O4/GO and Fe2.8Ce0.2O4/GO) were prepared via facile ultrasonic-assisted procedures and employed for destruction of oxytetracycline (OTC) under visible light irradiation. The changes in the relative crystal structure, morphology, atomic and surface functional group composition, magnetic, and optic properties of magnetite were uncovered by various techniques. The substantial degradation and mineralization of OTC via visible light/Fe2.8Ce0.2O4/GO system were thoroughly discussed in terms of narrowed band gap energy, the principal function of Ce3+/Ce4+ and Fe2+/Fe3+ redox pairs and GO platelets, enhanced charge separation and transfer, and enlarged active surface area. Furthermore, the performance of visible light/Fe2.8Ce0.2O4/GO system was evaluated for treating real wastewater and its efficiency was investigated using a number of enhancers and scavengers. Finally, the generated byproducts in the course of photodegradation were determined and the oxidation pathway, photocatalytic kinetics, and plausible mechanism were proposed. The results confirmed that the introduced Ce ions and graphene oxide sheets boost the photo-catalytic efficiency of magnetite for photodegradation of OTC.
Publication
Journal: Journal of Toxicology
August/22/2012
Abstract
Redox potential has been identified by the Organisation for Economic Co-operation and Development (OECD) as one of the parameters that should be investigated for the testing of manufactured nanomaterials. There is still some ambiguity concerning this parameter, i.e., as to what and how to measure, particularly when in a nanoecotoxicological context. In this study the redox potentials of six nanomaterials (either zinc oxide (ZnO) or cerium oxide (CeO(2))) dispersions were measured using an oxidation-reduction potential (ORP) electrode probe. The particles under testing differed in terms of their particle size and dispersion stability in deionised water and in various ecotox media. The ORP values of the various dispersions and how they fluctuate relative to each other are discussed. Results show that the ORP values are mainly governed by the type of liquid media employed, with little contributions from the nanoparticles. Seawater was shown to have reduced the ORP value, which was attributed to an increase in the concentration of reducing agents such as sulphites or the reduction of dissolved oxygen concentration. The lack of redox potential value contribution from the particles themselves is thought to be due to insufficient interaction of the particles at the Pt electrode of the ORP probe.
Publication
Journal: Journal of Health Economics
August/15/2001
Abstract
Given the considerable insight into corporate governance achieved through studies of executive compensation in proprietary firms it is surprising that executive contracting in nonprofit organizations remains largely unexplored. In this paper, we use the multitask principal agent model of Holmström and Milgrom [The Journal of Law, Economics and Organization 7 (1991) (Suppl.) 24] to argue that nonprofit hospitals represent an optimal response to information asymmetries between managers and boards. For a board with multidimensional objectives, the agency problem is getting top executives to distribute their efforts across all dimensions of the hospital's mission. The nonprofit form is preferred because the absence of high powered incentives such as share ownership reduces executives' incentives to place undue emphasis on improving financial performance at the expense of important but less observable tasks. Using newly available compensation data we test the model by comparing the conditional distributions of earnings for industrial and nonprofit hospital CEOs in Ontario. Our best estimates are that CEOs in publicly traded firms earn twice as much on average as those in similarly sized nonprofit hospitals but bear roughly eight times the income variance. Estimates of the associated degree of risk aversion are well within conventional bounds and are consistent with the trade-off between insurance and incentives predicted by the theory.
Publication
Journal: Chemosphere
December/15/2011
Abstract
Public concerns over the toxicity of nanoparticles (NPs) are growing due to the rapid development of nanotechnology. An important mechanism of nanotoxicity is oxidative stress resulting from reactive oxygen species (ROS). In this study, the chemical production of ROS by inorganic NPs oxidizing the mammalian phenolic compound, L-3,4-dihydroxyphenylalanine (l-dopa) was evaluated using a ROS sensitive dye, 2',7'-diclorodihydrofluorescin (DCFH). CeO(2), Fe(2)O(3) and Fe(0) NPs enhanced ROS production during the autoxidation of L-dopa by more than four-fold in reactions that were dependent on O(2). This is the first report of chemical ROS production due to interaction of phenolic compounds with NPs. Mn(2)O(3) oxidized DCFH in a reaction that did not require O(2) or L-dopa, suggesting a direct redox reaction between the Mn(2)O(3) and the dye. CeO(2), Mn(2)O(3) and to a lesser extent Fe(0) formed clear electron paramagnetic resonance (EPR) signature for hydroxyl radicals when incubated in aerobic aqueous suspensions with spin traps. The results indicate that NPs can generate ROS via chemical reactions with medium components and biomolecules susceptible to oxidation, such as L-dopa. NPs were reactive whereas micron-sized particles were not. The combined assay with L-dopa and DCFH is a method proposed to screen for chemical ROS production by NPs.
Publication
Journal: Review of Scientific Instruments
February/11/2009
Abstract
We report on a modification of a commercial scanning force microscope (Omicron UHV AFM/STM) operated in noncontact mode (NC-AFM) at room temperature in ultrahigh vacuum yielding a decrease in the spectral noise density from 2757 to 272 fm/Hz. The major part of the noise reduction is achieved by an exchange of the originally installed light emitting diode by a laser diode placed outside the vacuum, where the light is coupled into the ultrahigh vacuum chamber via an optical fiber. The setup is further improved by the use of preamplifiers having a bandpass characteristics tailored to the cantilever resonance frequency. The enhanced signal to noise ratio is demonstrated by a comparison of atomic resolution images on CeO(2)(111) obtained before and after the modification.
Publication
Journal: Journal of Hazardous Materials
June/5/2011
Abstract
Pt/Al(2)O(3)-CeO(2) nanocatalysts with Pt loading of 1% and ceria loading of 10, 20 and 30% were successfully prepared via wet impregnation method to be utilized in catalytic oxidation of BTX. The nanocatalysts were characterized using XRD, FESEM, TEM, N(2) adsorption, FTIR and TPR-H(2) techniques. The XRD patterns confirmed the formation of cerium oxide as the crystalline phase on alumina with the average crystallite size of 8.1-8.7 nm, derived by Scherrer equation. FESEM images confirmed that these nanocatalysts had ceria particles in nano-ranges. TEM analysis showed that platinum particles were fairly well dispersed on Al(2)O(3)-CeO(2) with an average size of 5-20 nm. BET surface area presented large surface area for nanocatalysts. TPR patterns showed that by adding 1% platinum to support, the reducibility is highly increased. These patterns also revealed the promoting effect of ceria on reducibility of Pt and Al(2)O(3). The results of toluene oxidation indicated that the synthesized nanocatalysts were highly active and able to remove nearly 100% of toluene and xylene and about 85% of benzene as representative VOCs. The presence of nanoparticles along with good characteristics of the synthesized nanocatalysts presented them as highly efficient materials for catalytic oxidation of VOCs.
Publication
Journal: Inorganic Chemistry
April/8/2004
Abstract
[Ce(NR(2))(3)] (R = SiMe(3)) with TeCl(4) in tetrahydrofuran solution gave a mixture of two major products in a combined yield of ca. 50% based on available metal: (i) the Ce(IV) amide [CeCl(NR(2))(3)] (1), which was isolated as purple needles and identified on the basis of (1)H NMR and mass spectra, microanalysis, and a single-crystal X-ray analysis [C(18)H(54)CeClN(3)Si(6), rhombohedral, R3c (No. 161), a = b = 18.4508(7) A, c = 16.8934(7) A, Z = 6]; (ii) unstable [[Ce(NR(2))(2)(mu-Cl)(thf)](2)] (2), as colorless blocks [C(32)H(88)Ce(2)Cl(2)N(4)O(2)Si(8), monoclinic, P2(1)/n (No. 14), a = 14.506(3) A, b = 13.065(3) A, c = 16.779(3) A, beta = 113.789(12) degrees, Z = 2], which readily disproportionated in solution. In toluene solution, the product 1 was obtained exclusively. The same cerium(III) amide starting material was oxidized by PBr(2)Ph(3) in diethyl ether solution to give purple [CeBr(NR(2))(3)] (3) [C(18)H(54)BrCeN(3)Si(6), rhombohedral, R3c (No. 161), a = b = 18.4113(12) A, c = 16.9631(17) A, Z = 6], along with presumed [CeBr(3)(OEt(2))(n)()], which has not been characterized but with thf, by displacement of the ether ligands, gave [CeBr(3)(thf)(4)] (4) [C(16)H(32)Br(3)CeO(4), triclinic, P1 (No. 2), a = 8.2536(7) A, b = 9.4157(5) A, c = 15.5935(14) A, alpha = 79.009(5), beta = 87.290(3) degrees, gamma = 74.835(5) degrees, Z = 2). TeBr(4) reacted with [Ce(NR(2))(3)] in thf to give small amounts of 3; the major product (although only formed in 15% yield) was monomeric [CeBr(2)(NR(2))(thf)(3)] (5) [C(18)H(42)Br(2)CeNO(3)Si(2), monoclinic, P2(1)/c (No. 14), a = 14.9421(4) A, b = 11.8134(5) A, c = 15.8317(7) A, alpha = gamma = 120 degrees, beta = 92.185(3) degrees, Z = 4].
Publication
Journal: Environmental Pollution
May/14/2014
Abstract
A multi-scale methodology was used to characterize the long-term behavior and chemical stability of a CeO2-based nanocomposite used as UV filter in wood stains. ATR-FTIR and (13)C NMR demonstrated that the citrate coated chelates with Ce(IV) through its central carboxyl- and its α-hydroxyl- groups at the surface of the unaged nanocomposite. After 42 days under artificial daylight, the citrate completely disappeared and small amount of degradation products remained attached to the surface even after 112 days. Moreover, the release/desorption of the citrate layer led to a surface reorganization of the nano-sized CeO2 core observed by XANES (Ce L3-edge). Such a surface and structural transformation of the commercialized nanocomposite could have implications in term of fate, transport, and potential impacts towards the environment.
Publication
Journal: Chemical Research in Toxicology
March/24/2010
Abstract
With the goal of elucidating the molecular and cellular mechanisms of chloroprene toxicity, we examined the potential DNA cross-linking of the bifunctional chloroprene metabolite, (1-chloroethenyl)oxirane (CEO). We used denaturing polyacrylamide gel electrophoresis to monitor the possible formation of interstrand cross-links by CEO within synthetic DNA duplexes. Our data suggest interstrand cross-linking at deoxyguanosine residues within 5'-GC and 5'-GGC sites, with the rate of cross-linking depending on pH (pH 5.0>> pH 6.0>> pH 7.0). A comparison of the cross-linking efficiencies of CEO and the structurally similar cross-linkers diepoxybutane (DEB) and epichlorohydrin (ECH) revealed that DEB>> CEO>> or = ECH. Furthermore, we found that cytotoxicity correlates with cross-linking efficiency, supporting a role for interstrand cross-links in the genotoxicology of chloroprene.
Publication
Journal: International Journal of Biochemistry and Cell Biology
February/3/2016
Abstract
Energy metabolism alterations are found in a large number of rare and common diseases of genetic or environmental origin. The number of patients that could benefit from bioenergetic modulation therapy (BIOMET) is therefore very important and includes individuals with pathologies as diverse as mitochondrial diseases, acute coronary syndrome, chronic kidney disease, asthma or even cancer. Although, the alteration of energy metabolism is disease specific and sometimes patient specific, the strategies for BIOMET could be common and target a series of bioenergetic regulatory mechanisms discussed in this article. An excellent training of scientists in the field of energy metabolism, related human diseases and drug discovery is also crucial to form a young generation of MDs, PHDs and Pharma or CRO-group leaders who will discover novel personalized bioenergetic medicines, through pharmacology, genetics, nutrition or adapted exercise training. The Mitochondrial European Educational Training (MEET) consortium was created to pursue this goal, and we dedicated here a special issue of Organelle in Focus (OiF) to highlight their objectives. A total of 10 OiFs articles constitute this Directed Issue on Mitochondrial Medicine. As part of this editorial article, we asked timely questions to the PR. Jan W. Smeitink, professor of Mitochondrial Medicine and CEO of Khondrion, a mitochondrial medicine company. He shared with us his objectives and strategies for the study of mitochondrial diseases and the identification of future treatments. This article is part of a Directed Issue entitled: Energy Metabolism Disorders and Therapies.
Publication
Journal: Medical Journal of Australia
March/12/2012
Abstract
Yes. Public health adviser David Roder and Cancer Council Australia CEO Ian Olver believe the reduction in breast cancer mortality in Australia reflects both treatment and screening effects.
Publication
Journal: Journal of Ocular Pharmacology and Therapeutics
December/31/2019
Abstract
Cerium oxide nanoparticles (CeO2-NPs; or nanoceria) have been largely studied for biomedical applications due to their peculiar auto-regenerative antioxidant activity. This review focuses on ophthalmic applications of nanoceria. Many in vivo data indicate that nanoceria protect the retina from neurodegeneration. In particular, they have been tested in animal models of age-related macular degeneration and retinitis pigmentosa and their neuroprotective properties have been shown to persist for a long time, without any collateral effects. In vitro cytotoxicity studies have shown that CeO2-NPs could be safe for lens cells and could represent a new therapy for cataract treatment, but further studies are needed. To date, different pharmaceutical formulations based on nanoceria have been created looking at future clinical ophthalmic applications, such as water-soluble nanoceria, glycol chitosan-coated ceria nanoparticles (GCCNPs), and alginate-gelatin hydrogel loaded GCCNPs. GCCNPs were also effective in preventing choroidal neovascularization in vivo. Based on the nanosize of nanoceria, corneal permeation could be achieved to allow topical treatment of nanoceria. PEGylation and encapsulation in liposomes represent the main strategies to support corneal permeation, without altering nanoceria chemical-physical properties. Based on their great antioxidant properties, safety, and nanosize, nanoceria represent a new potential therapeutic for the treatment of several eye disorders.
Publication
Journal: Journal of Synchrotron Radiation
October/8/2008
Abstract
A GE Revolution 41RT flat-panel detector (GE 41RT) from GE Healthcare (GE) has been in operation at the Advanced Photon Source for over two years. The detector has an active area of 41 cm x 41 cm with 200 microm x 200 microm pixel size. The nominal working photon energy is around 80 keV. The physical set-up and utility software of the detector system are discussed in this article. The linearity of the detector response was measured at 80.7 keV. The memory effect of the detector element, called lag, was also measured at different exposure times and gain settings. The modulation transfer function was measured in terms of the line-spread function using a 25 microm x 1 cm tungsten slit. The background (dark) signal, the signal that the detector will carry without exposure to X-rays, was measured at three different gain settings and with exposure times of 1 ms to 15 s. The radial geometric flatness of the sensor panel was measured using the diffraction pattern from a CeO(2) powder standard. The large active area and fast data-capturing rate, i.e. 8 frames s(-1) in radiography mode, 30 frames s(-1) in fluoroscopy mode, make the GE 41RT one of a kind and very versatile in synchrotron diffraction. The loading behavior of a Cu/Nb multilayer material is used to demonstrate the use of the detector in a strain-stress experiment. Data from the measurement of various samples, amorphous SiO(2) in particular, are presented to show the detector effectiveness in pair distribution function measurements.
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