Tunable copper doped Zn
1−
x
Cd
x
S alloy quantum dots (QDs) were successfully synthesized by the wet chemical method. A one-step method is developed to synthesize doped ternary QDs which is more ...preferable than a two-step method. The influence of experimental parameters like the Zn/Cd ratio and Cu dopant concentration has been investigated using various spectroscopic techniques like UV-visible, photoluminescence, X-ray diffraction and Raman spectroscopy. The absorption and emission properties can be tuned by changing the concentration of components of the ternary QDs. The high concentration of dopant completely quenched the emission of the ternary QDs. EDX gives confirmation of the elemental composition of the synthesized samples. The obtained results suggest the successful doping of the ternary QDs. Interestingly, the study results revealed that the crystal structure (ZB and/or WZ) and the dual emission of the Cu-doped Zn
1−
x
Cd
x
Se alloy QDs could be controlled by varying the dopant concentration and chemical composition of the host. Doping also leads to enhancement in emission properties and provides more stability to ternary QDs. The enhancement in the photoluminescence (PL) decay lifetime of Cu-doped ternary QDs can be advantageous for optoelectronic and biosensor applications.
Tunable copper doped Zn
1−
x
Cd
x
S alloy quantum dots (QDs) were successfully synthesized by the wet chemical method.
Enhanced recovery pathways have been shown to reduce length of stay without increasing readmission or complications in numerous areas of surgery. Uptake of gynecologic oncology ERAS guidelines has ...been limited. We describe the effect of ERAS guideline implementation in gynecologic oncology on length of stay, patient outcomes, and economic impact for a province-wide single-payer system.
We compared pre- and post-guideline implementation outcomes in consecutive staging and debulking patients at two centers that provide the majority of surgical gynecologic oncology care in Alberta, Canada between March 2016 and April 2017. Clinical outcomes and compliance were obtained using the ERAS Interactive Audit System. Patients were followed until 30 days after discharge. Negative binomial regression was employed to adjust for patient characteristics.
We assessed 152 pre-ERAS and 367 post-ERAS implementation patients. Mean compliance with ERAS care elements increased from 56% to 77.0% after implementation (p < 0.0001). Median length of stay for all surgeries decreased from 4.0 days to 3.0 days post-ERAS (p < 0.0001), which translated to an adjusted LOS decrease of 31.4% (95% CI = 21.7% - 39.9%, p < 0.0001). In medium/high complexity surgery median LOS was reduced by 2.0 days (p = 0.0005). Complications prior to discharge decreased from 53.3% to 36.2% post-ERAS (p = 0.0003). There was no significant difference in readmission (p = 0.6159), complications up to 30 days (p = 0.6274), or mortality (p = 0.3618) between the cohorts. The net cost savings per patient was $956 (95%CI: $162 to $1636).
Systematic implementation of ERAS gynecologic oncology guidelines across a healthcare system improves patient outcomes and saves resources.
•Implementation of ERAS gynecologic oncology guidelines results in significant clinical improvements and cost savings.•Use of an audit system allows measurement of compliance to the individual ERAS recommendations.•ERAS teams should strive to improve compliance to guidelines as this translates into improved outcomes.
We report investigations on the crystal structure and optical properties of CdTe/CdTe0.5Se0.5/CdSe (CdTe/CdTeSe/CdSe) core/alloyed/shell (C/A/S) type-II structure and comparison with CdTe core and ...CdTe/CdSe core/shell (C/S) quantum dots. The analysis of crystal structure by X-ray diffraction and phonon vibration approve for a composition-tuned of C/A/S structure. Tuning C/S composition and structure, we are able to confine holes in the core, and delocalize electrons both in the shell and alloyed. The photoluminescence (PL) arises from a tunneling of electrons through the alloyed layer at low pump fluence. At higher excitation power, the PL reveals a large blue-shift (46 meV) and a peak broadening toward to high-energy, which can be explained by the second recombination route of electrons and holes in the alloyed and core, respectively. An important implication of these results is the possibility of tunable dual emission by laser power, and approves for the tunneling exciton recombination.
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•Fabricate the new CdTe/CdTeSe/CdSe core/alloyed/shell nanostructure.•For the first time, the quantum tunneling recombination of exciton is observed in colloidal QDs.•Our results suggest that the possibility of tunable dual emission by laser power.
A systematic investigation of the structural, magnetic and electrical properties of a series of nanocrystalline La0.7SrxCa0.3-xMnO3 materials, prepared by high energy ball milling method and then ...annealed at 900 degree C has been undertaken. The analysis of the XRD data using the Win-metric software shows an increase in the unit cell volume with increasing Sr ion concentration. The La0.7SrxCa0.3-xMnO3 compounds undergo a structural orthorhombic-to-monoclinic transition at x=0.15. Electric and magnetic measurements show that both the Curie temperature and the insulator-to-metal transition temperature increase from 259 K and 253 K correspondingly for La0.7Ca0.3MnO3 (x=0) to 353 K and 282 K, respectively, for La0.7Sr0.3MnO3 (x=0.3). It is argued that the larger radius of Sr2+ ion than that of Ca2+ is the reason to strengthen the double-exchange interaction and to give rise to the observed increase of transition temperatures. Using the phenomenological equation for conductivity under a percolation approach, which depends on the phase segregation of ferromagnetic metallic clusters and paramagnetic insulating regions, we fitted the resistivity versus temperature data measured in the range of 50-320 K and found that the activation barrier decreased with the raising Sr2+ ion concentration.
We have used wet chemical methods to fabricate colloidal CdSe/CdSm/ZnSen core/intermediate/shell (C/I/S) nanocrystals (NCs), where m = 1 and 2 and n = 1–4 are the number of monolayers. The growth was ...monitored by using Raman and UV–vis spectroscopy, which demonstrated the formation of correct CdSe/CdSm/ZnSen C/I/S NCs. X-ray diffraction studies proved single-phase NCs crystallized in the zincblende-type structure. Photoluminescence (PL) studies have indicated that after photoexcitation C/I/S NCs generate simultaneously type-I and type-II emissions, namely EI and EII, associated with CdSe/CdSm and CdSm/ZnSen structures, respectively. For a specific value of m = 2, we have found the redshift of both EI and EII emissions when n is increased from 1 to 4. The PL studies versus the laser-excitation power (Pex) up to about four orders of magnitude allow us to identify the origin of two emissions. A large blueshift of the EII peak is ascribed to the band bending effect resulting from the spatially separated photoexcited carriers in type-II NCs. It appears that the dependence of the EII peak on the cube root of Pex (Pex1/3) is linear while that of the EI peak on Pex1/3 is almost constant. In this work, we also point out that the emission intensity (I) of EI and EII can be tuned by changing the values of n and Pex, where I obeys a power law I∝Pexk, with k = 0.7–1.0 dependent on the emission type. The nature of these phenomena is discussed in comparison with previous studies on C/S and C/I/S nanoheterostructures.
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•Type-I/Type-II CdSe/CdS/ZnSe C/I/S NCs have been synthesized successfully.•Provided the evidence for the formation of the CdSe/CdS/ZnSe NCs.•Demonstrated the origin of two emission peaks of CdSe/CdS/ZnSe NCs.•Explain the emission mechanism of two emission peaks when the excitation power changes.•The emission intensity of EI and EII can be tuned by changing the values of n and Pex.
The Enhanced Recovery After Surgery (eras) colorectal guideline has been implemented widely across Alberta. Our study examined the clinical and cost impacts of eras on colon cancer patients across ...the province.
We first used both summary statistics and multivariate regression methods to compare, before and after guideline implementation, clinical outcomes (length of stay, complications, readmissions) in consecutive elective colorectal patients 18 or more years of age and in colon cancer and non-cancer patients treated at the Peter Lougheed Centre and the Grey Nuns Hospital between February 2013 and December 2014. We then used the differences in clinical outcomes for colon cancer patients, together with the average cost per hospital day, to estimate cost impacts.
The analysis considered 790 patients (398 cancer and 392 non-cancer patients). Mean guideline compliance increased to 60% in cancer patients and 57% in non-cancer patients after eras implementation from 37% overall before eras implementation. From pre- to post-eras, mean length of stay declined to 8.4 ± 5 days from 9.5 ± 7 days in cancer patients, and to 6.4 ± 4 days from 8.8 ± 5.5 days in non-cancer patients (p = 0.0012 and p = 0.0041 respectively). Complications declined significantly in the renal, hepatic, pancreatic, and gastrointestinal groups (difference in proportions: 13% in cancer patients; p < 0.05). No significant change in the risk of readmission was observed. The net cost savings attributable to eras implementation ranged from $1,096 to $2,771 per cancer patient and from $3,388 to $7,103 per non-cancer patient.
Implementation of eras not only resulted in clinical outcome improvements, but also had a significant beneficial impact on scarce health system resources. The effect for cancer patients was different from that for non-cancer patients, representing an opportunity for further refinement and study.
•Tricritical point in Y-doped Nd0.7Sr0.3MnO3 manganites.•A large magnetic-entropy change.•Magnetic inhomogeneity and phase separation.
We have determined the values of critical exponents of two ...polycrystalline samples (Nd1−xYx)0.7Sr0.3MnO3 (x=0 and 0.07) from the magnetization data versus temperature and magnetic field, M(H, T), to learn about their magnetic and magnetocaloric (MC) properties. The results reveal the samples exhibiting the crossover of first-order and second-order phase transitions, where the exponent values β=0.271 and γ=0.922 for x=0, and β=0.234–0.236 and γ=1.044–1.063 for x=0.07 determined by using modified Arrott plots and static-scaling hypothesis are close to those expected for the tricritical mean-field theory (β=0.25 and γ=1.0). Particularly, the TC of x=0 and 0.07 can be any value in the temperature ranges of 240–255K and 170–278K, respectively, depending on the magnitude of applied magnetic field and determination techniques. Around the TC, studying the MC effect of the samples has revealed a large magnetic-entropy change (ΔSm) up to ∼8J/kgK for the applied field interval ΔH=50kOe, corresponding to refrigerant capacity values of 200–245J/kg. These phenomena are related to the crossover nature and the persisting of FM/anti-FM interactions even above the TC, as further confirmed by electron-spin-resonance data, Curie–Weiss law-based analyses, and an exponential parameter characteristic of magnetic order n=dLn|ΔSm|/dLnH.
ERAS—Value based surgery Ljungqvist, Olle; Thanh, Nguyen X.; Nelson, Gregg
Journal of surgical oncology,
October 1, 2017, Letnik:
116, Številka:
5
Journal Article
Recenzirano
This paper reviews implementation of ERAS and its financial implications. Literature on clinical outcomes and financial implications were reviewed. Reports from many different surgery types shows ...that implementation of ERAS reduces complications and shortens hospital stay. These improvements have major impacts on reducing the cost of care even when costs for implementation, and investment in time for personnel and training is accounted for. The conclusion is that ERAS is an excellent example of value based surgery.
Two new and three known polyhydroxysteroid glycosides were isolated from the MeOH extract of the starfish Acanthaster planci. The structures of the isolated compounds were elucidated using NMR and ...mass spectrometry. The new glycosides had the same aglycon, (24S)-24-methyl-5α-cholestane-3β,4β,6α,8,15β,16β,28-heptaol, and different carbohydrate fragments,2-O-methyl-β-D-xylopyranosyl-(1→2)-β-D-galactofuranose and 5-O-sulfo-α-L-arabinofuranose, bonded to the C-28 position of the 24-methylcholestane side chain.
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