A ring R called left SF if its simple left modules are at. Regular rings are known to be left SF-rings. However, till date it is unknown whether a left SF-ring is necessarily regular. In this paper, ...we prove the strong regularity of left (right) complement bounded left SF-rings. We also prove the strong regularity of a class of generalized semi-commutative left SF-rings.
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IZUM, KILJ, NUK, PILJ, PNG, SAZU, UL, UM, UPUK
Very few studies describe the fate of artificial sweeteners (ASWs) in wastewater treatment plants (WWTPs). In this study, mass loadings, removal efficiencies, and environmental emission of sucralose, ...saccharin, aspartame, and acesulfame were determined based on the concentrations measured in wastewater influent, primary effluent, effluent, suspended particulate matter (SPM), and sludge collected from two WWTPs in the Albany area of New York State, U.S.A. All ASWs were detected at a mean concentration that ranged from 0.13 (aspartame) to 29.4 μg/L (sucralose) in wastewater influent, 0.49 (aspartame) to 27.7 μg/L (sucralose) in primary influent, 0.11 (aspartame) to 29.6 μg/L (sucralose) in effluent, and from 0.08 (aspartame) to 0.65 μg/g dw (sucralose) in sludge. Aspartame was found in 92% of influent SPM samples at a mean concentration of 444 ng/g dw, followed by acesulfame (92 ng/g) and saccharin (49 ng/g). The fraction of the total mass of ASWs sorbed to SPM was in the rank order: aspartame (50.4%) > acesulfame (10.9%) > saccharin and sucralose (0.8%). The sorption coefficients of ASWs ranged from 4.10 (saccharin) to 4540 L/kg (aspartame). Significant removal of aspartame (68.2%) and saccharin (90.3%) was found in WWTPs; however, sucralose and acesulfame were less efficiently removed (<2.0%). The total mass loading of sucralose, saccharin, and acesulfame in the WWTP that served a smaller population (∼15 000) was 1.3–1.5 times lower than that in another WWTP that served a larger population (∼100 000). The average daily loading of sucralose in both WWTPs (18.5 g/d/1000 people) was ∼2 times higher than the average loading of saccharin. The daily discharge of sucralose from the WWTPs was the highest (17.6 g/d/1000 people), followed by acesulfame (1.22 g/d/1000 people), and saccharin (1.07 g/d/1000 people). Approximately, 1180 g of saccharin and 291 g of acesulfame were transformed in or removed daily from the two WWTPs. This is the first study to describe the fate of ASWs, including the fraction found in SPM and in sludge, in addition to the aqueous portion of wastewater in WWTPs.
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IJS, KILJ, NUK, PNG, UL, UM
This study reports a new record of freshwater fish Macrognathus aral (Bloch & Schneider) from Aiechu-Kalikhola tributary of the Maukhola river in Sarpang, Bhutan. The species was found in shoal of ...the tributary and was identified using its morphometric characters. It can be identified and distinguished from its congeners reported in Bhutan by dorsal fin rays XIX, 47, anal fin rays III, 52, rostral plates 28, pectoral fin rays 19, caudal fin rays 15, soft rayed part of dorsal and anal fin separated by a notch from rounded caudal fin, and presence of four ocelli at the base of dorsal fins. Further studies are needed to better understand its distribution, ecology, and population dynamics in the country. A key to species belonging to Mastacembelidae of Bhutan including the new record is provided.
I study the lattice dynamics and electron-phonon coupling in noncentrosymmetric quasi-one-dimensional K2Cr3As3 using density functional theory based first principles calculations. The phonon ...dispersions show stable phonons without any soft-mode behavior. They also exhibit features that point to a strong interaction of K atoms with the lattice. I find that the calculated Eliashberg spectral function shows a large enhancement around 50 cm-1. The phonon modes that show large coupling involve inplane motions of all three species of atoms. The q dependent electron-phonon coupling decreases strongly away from the qz=0 plane. The total electron-phonon coupling is large, with a value of lambdaep=3.0, which readily explains the experimentally observed large mass enhancement.
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CMK, CTK, FMFMET, IJS, NUK, PNG, UM
Sewage epidemiology is a rapidly expanding field that can provide information on illicit drug usage in communities, based on the measured concentrations in samples from wastewater treatment plants ...(WWTPs). In this study, select illicit drugs (six drugs and eight metabolites) were determined on a daily basis for a week in wastewater, suspended particulate matter (SPM), and sludge from two WWTPs in the Albany area in New York State. The WWTP that served a larger population (∼100 000, with a flow rate of 83 300 m3/d) showed 3.2 (methadone) to 51 (3,4-methylenedioxyamphetamine; MDA) times higher mass flows of illicit drugs than did the WWTP that served a smaller population (∼15 000, with a flow rate of 6850 m3/d). The consumption rate of target illicit drugs in the communities served by the two WWTPs was estimated to range from 1.67 to 3510 mg/d/1000 people. Between the dissolved and particulate phases, the fraction of methadone, 2-ethylidene-1,5-dimethyl-3,3-diphenylpyrrolidine (EDDP), amphetamine, and MDA sorbed to SPM ranged from 34.3% to 41.1% of the total mass in the waste stream. The removal efficiencies of illicit drugs from the two WWTPs ranged from 4% (norcocaine) to 99% (cocaine); however, methamphetamine, methadone, and EDDP showed a negative removal in WWTPs. The environmental emission of illicit drugs from WWTP discharges was calculated to range from 0.38 (MDEA) to 67.5 (EDDP) mg/d/1000 people. Other markers such as caffeine, paraxanthine, nicotine, and cotinine were found to predict the concentrations of select illicit drugs in raw wastewater (r 2 = 0.20–0.79; p ≤ 0.029).
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Two 2H-1-benzopyran derivatives, methyl 8-hydroxy-2,2-dimethyl-2H-1-benzopyran-5-carboxylate (1) and methyl 8-hydroxy-2,2-dimethyl-2H-1-benzopyran-6-carboxylate (2), including a new compound (1) were ...isolated from the twigs of Chaenomeles sinensis. Their chemical structures were characterized based on analysis of NMR data including 1H and 13C, COSY, HSQC, and HMBC and HRMS data. The isolated compounds (1 and 2) were assessed for their anti-neuroinflammatory activity by measuring inhibition levels of nitric oxide (NO) production in lipopolysaccharide (LPS)-activated BV-2 cells and for their neurotrophic activity by the secretion of nerve growth factor (NGF) in C6 cells. Compounds 1 and 2 exhibited powerful anti-neuroinflammatory effects with IC50 values of 17.14 and 19.30 μM, respectively, without cell toxicity, and also showed moderate effects on the stimulation of NGF secretion levels with 113.15 ± 3.54 and 130.20 ± 8.03%, respectively. The biosynthetic pathway of 1 and 2 was proposed that they would be derived from a protocatechuic acid and an isoprenyl unit.
Introduction
The world is heading towards a larger proportion of older population, indicating an increased risk of diseases, disability, and advanced ageing before death as well as the demand for the ...health system.
Methods
This study is a community based cross-sectional study, total 329 older people aged 60 years and above were surveyed. Two stage cluster-sampling technique was used. Semi structured questionnaire was used for data collection.
Results
Current study showed that 63.3% of the older population have utilized health services in the past one year. Multivariate analysis showed that, respondents with basic education and secondary education are 0.3(AOR: 0.31, 95% CI: 0.17-0.56) and 0.14 (AOR: 0.14, 95% CI: 0.83-0.26) times less likely to utilize health services, respectively. Similarly, respondents reporting current personnel income above forty thousand are 2.8 (AOR:2.81 95% CI:1.84-4.31) times more likely to utilize health services. Respondents at risk of malnutrition are 2.1(AOR: 2.18, 95% CI: 1.14-4.17) times more likely to utilize health services, similarly undernourished respondents are 3.3 (AOR:3.35,95% CI:1.50-7.51) times more likely to utilize health services as compared to respondents with normal nutritional status. Respondents with chronic disease condition are 11.8 (AOR: 11.89, 95% CI: 6.81-20.74) times more likely to utilize health services as compared to those with no chronic disease condition when holding other variables constant.
Conclusions
There is urgent need to highlight the problems faced by the older population as regards health service utilization and dealing with the identified factors associated with health service utilization among the older population should receive high priority.
Key messages
* Municipality and health facilities should create enabling environment for older population to get necessary health services.
* Awareness program targeting the underprivileged ethnic groups and poor houses are recommended.
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NUK, OILJ, UL, UM, UPUK, VSZLJ
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