oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 6 )

2019 ( 134 )

2018 ( 465 )

2017 ( 529 )

Custom range...

Search Results: 1 - 10 of 15493 matches for " Physical Stability "
All listed articles are free for downloading (OA Articles)
Page 1 /15493
Display every page Item
Stabilit tsanalyse des sekund ren Spannungszustandes in der Umgebung
?urove Juraj B.,Maras Michal
Acta Montanistica Slovaca , 1999,
Abstract: lánok sa zaoberá problematikou stability dlhych banskych diel, ktorá je vyznamná aj v pecifickych prípadoch líniovych podzemnych stavieb razenych v málopevnych horninách. Vyskum zmien nap ovo-deformaèného stavu tychto diel bol realizovany pomocou experimentov na modeloch z ekvivalentnych materiálov. Uvedené vysledky pokusov umo ňujú stanovi hodnotu reakcie vystu e q potrebnú pre stabilizáciu podzemného diela razeného v pru no-plastickom horninovom prostredí
Characterization and stability studies of a novel liposomal cyclosporin A prepared using the supercritical fluid method: comparison with the modified conventional Bangham method
Karn PR, Cho W, Park HJ, Park JS, Hwang SJ
International Journal of Nanomedicine , 2013, DOI: http://dx.doi.org/10.2147/IJN.S39025
Abstract: racterization and stability studies of a novel liposomal cyclosporin A prepared using the supercritical fluid method: comparison with the modified conventional Bangham method Original Research (754) Total Article Views Authors: Karn PR, Cho W, Park HJ, Park JS, Hwang SJ Published Date January 2013 Volume 2013:8 Pages 365 - 377 DOI: http://dx.doi.org/10.2147/IJN.S39025 Received: 11 October 2012 Accepted: 24 November 2012 Published: 22 January 2013 Pankaj Ranjan Karn,1,3 Wonkyung Cho,1,3 Hee-Jun Park,1,3 Jeong-Sook Park,3 Sung-Joo Hwang1,2 1Yonsei Institute of Pharmaceutical Sciences, Yonsei University, Yeonsu-gu, Incheon, Republic of Korea; 2College of Pharmacy, Yonsei University, Yeonsu-gu, Incheon, Republic of Korea; 3College of Pharmacy, Chungnam National University, Yuseong-gu, Daejeon, Republic of Korea Abstract: A novel method to prepare cyclosporin A encapsulated liposomes was introduced using supercritical fluid of carbon dioxide (SCF-CO2) as an antisolvent. To investigate the strength of the newly developed SCF-CO2 method compared with the modified conventional Bangham method, particle size, zeta potential, and polydispersity index (PDI) of both liposomal formulations were characterized and compared. In addition, entrapment efficiency (EE) and drug loading (DL) characteristics were analyzed by reversed-phase high-performance liquid chromatography. Significantly larger particle size and PDI were revealed from the conventional method, while EE (%) and DL (%) did not exhibit any significant differences. The SCF-CO2 liposomes were found to be relatively smaller, multilamellar, and spherical with a smoother surface as determined by transmission electron microscopy. SCF-CO2 liposomes showed no significant differences in their particle size and PDI after more than 3 months, whereas conventional liposomes exhibited significant changes in their particle size. The initial yield (%), EE (%), and DL (%) of SCF-CO2 liposomes and conventional liposomes were 90.98 ± 2.94, 92.20 ± 1.36, 20.99 ± 0.84 and 90.72 ± 2.83, 90.24 ± 1.37, 20.47 ± 0.94, respectively, which changed after 14 weeks to 86.65 ± 0.30, 87.63 ± 0.72, 18.98 ± 0.22 and 75.04 ± 8.80, 84.59 ± 5.13, 15.94 ± 2.80, respectively. Therefore, the newly developed SCF-CO2 method could be a better alternative compared with the conventional method and may provide a promising approach for large-scale production of liposomes.
Tracking of TV and video gaming during childhood: Iowa Bone Development Study
Shelby L Francis, Matthew J Stancel, Frances D Sernulka-George, Barbara Broffitt, Steven M Levy, Kathleen F Janz
International Journal of Behavioral Nutrition and Physical Activity , 2011, DOI: 10.1186/1479-5868-8-100
Abstract: TV viewing and VG use were measured at ages 5, 8, 11, and 13 (n = 434) via parental- and self-report. MVPA was measured using the Actigraph, % BF using dual-energy x-ray absorptiometry, and maturity via Mirwald predictive equations. Generalized Estimating Equations (GEE) were used to assess stability and logistic regression was used to predict children "at risk" for maintaining sedentary behaviors. Additional models examined tracking only in overfat children (boys ≥ 25% BF; girls ≥ 32% BF). Data were collected from 1998 to 2007 and analyzed in 2010.The adjusted stability coefficients (GEE) for TV viewing were 0.35 (95% CI = 0.26, 0.44) for boys, 0.32 (0.23, 0.40) for girls, and 0.45 (0.27, 0.64) for overfat. For VG use, the adjusted stability coefficients were 0.14 (0.05, 0.24) for boys, 0.24 (0.10, 0.38) for girls, and 0.29 (0.08, 0.50) for overfat. The adjusted odds ratios (OR) for TV viewing were 3.2 (2.0, 5.2) for boys, 2.9 (1.9, 4.6) for girls, and 6.2 (2.2, 17.2) for overfat. For VG use, the OR were 1.8 (1.1, 3.1) for boys, 3.5 (2.1, 5.8) for girls, and 1.9 (0.6, 6.1) for overfat.TV viewing and VG use are moderately stable throughout childhood and predictive of later behavior. TV viewing appears to be more stable in younger children than VG use and more predictive of later behavior. Since habitual patterns of sedentarism in young children tend to continue to adolescence, early intervention strategies, particularly to reduce TV viewing, are warranted.Childhood overweight and obesity rates have increased dramatically since 1990. The worldwide prevalence of childhood overweight and obesity increased from 4.2% in 1990 to 6.7% in 2010. In 2010, 43 million children were estimated to be overweight and obese, with another 92 million at risk of becoming overweight [1]. In the US, National Health and Nutrition Examination Survey (NHANES) data indicate that childhood obesity rates have tripled from 1980 to 2008 [2,3]. Previous studies have shown that increased sedentary
VARIACIóN EN EL TIEMPO DE LAS PROPIEDADES FíSICAS DE UN SUELO CON ADICIóN DE ENMIENDAS ORGáNICAS
Seguel S.,Oscar; García de Cortázar G. de C.,Víctor; Casanova P.,Manuel;
Agricultura Técnica , 2003, DOI: 10.4067/S0365-28072003000300008
Abstract: the present study had the objective of evaluating the potential of a biofertilizer and bovine manure as agents to improve soil physical properties. the applied biofertilizer came from residues produced by a batch biodigestor and the manure came from a dairy. a soil amendment was made in plots of 6 x 3 m with four treatments and three replicates. the treatments, in a volumetric ratio, were: control without amendment; soil:biofertilizer mixture on a 3:1 ratio. soil:biofertilizer mixture on a 1:1 ratio; soil:manure mixture on a 1:1 ratio. in the second year, the plots were divided in two, leaving subplots of 6 x 1.5 m, one of which had a second amendment with the same organic material and the same ratio. the effects of the treatments were evaluated at one month, one year and two years after the first application. the soil parameters evaluated were: bulk density, specific weight, water retention, water infiltration rate and aggregate stability. a cactus pear (opuntia ficus - indica (l.) mill.) plantation was established as a test plant. the application of organic material in great volume provoked a decrease on soil bulk density in the short run; consequently, total porosity increased, particularly the coarse pores (reflected in the pf curve). the specific weight and available water were not different between treatments, while the water infiltration rate increased with amendments. there was an increase in the aggregate stability in the short term, but with successive applications the effect disappeared. finally, the biofertilizer applications promoted cactus growth of shoots and production of dm.
Confiabilidade de testes de aptid?o funcional em mulheres de 60 a 80 anos
Virtuoso Júnior,J.S.; Guerra,R.O.;
Motricidade , 2011,
Abstract: the aim of the present study was to verify the reliability expressed by the internal consistency and stability of two series of specific functional fitness tests (aahperd and fullerton) in elderly populations. thirty-six women, mean age 68-year-old, were selected (sd = 6.64). parameters of functional fitness evaluated were: body strength, flexibility, agility and dynamic balance, coordination, and aerobic endurance. descriptive statistics were used to analyze the data and describe the sample (frequency, mean and standard deviation), and the intraclass correlation coefficient (ricc) was used to verify the concordance between the stability and internal consistency of the tests. estimated intervals of 95% of reliability was adopted. in general, the two series showed acceptable rates of reliability, the ricc varying from 0.60 to 0.94. fullerton test proved to be more consistent in the ricc of the proposed tests, mainly in relation to flexibility of the hip and the two-minute-stationary-walking test for the evaluation of aerobic endurance. results allowed for the conclusion that both series of tests present acceptable levels of reliability.
Qualidade física de um latossolo vermelho acriférrico sob diferentes sistemas de uso e manejo
Aratani, Ricardo Garcia;Freddi, On? da Silva;Centurion, José Frederico;Andrioli, Itamar;
Revista Brasileira de Ciência do Solo , 2009, DOI: 10.1590/S0100-06832009000300020
Abstract: agricultural management systems can cause degradation of the soil physical quality, with consequences to the environment and crop yields. thus, the purpose of this study was to evaluate and compare the physical quality of an anionic acrustox in guaíra, s?o paulo state, under the following treatments: no-tillage with irrigation, no-tillage without irrigation, croppasture rotation, conventional tillage, and native forest. the organic matter content, aggregate stability, soil bulk density, porosity and index s were evaluated. results showed that human intervention reduced the soil quality and that no-tillage led to no increase in organic matter contents, but it did increase aggregation indices as compared with conventional tillage. in the no-tillage system plus irrigation, the aggregate stability increased in all evaluated soil layers and there also was gains in macropore volume in the 0-0.10 m soil layer over time. the use of crop-pasture rotation did not improve the soil physical quality and the index s varied according to the systems, although it was always higher than the value suggested as limit for good soil physical quality.
Desenvolvimento e avalia??o da estabilidade física de lo??es O/A contendo filtros solares
Borghetti, Greice Stefani;Knorst, Miriam Teresinha;
Revista Brasileira de Ciências Farmacêuticas , 2006, DOI: 10.1590/S1516-93322006000400008
Abstract: the objectives of this study were to develop and to evaluate the physical stability of o/w lotions containing 6% (w/w) of the sunscreen octylmethoxycinnamate (omc) or methyl benzylidene camphor (mbc). the formulations were stored at room temperature, for six months and during this period its macroscopic characteristics, viscosity and rheological behavior, oil indexes, spreading properties and sun protection factor (spf) were evaluated. the results demonstrate that both formulations were stable for six months. the spf values were significantly (p < 0.05) higher for mbc formulation. on the other hand, the omc formulation presented significantly (p < 0.05) higher spreading and lower viscosity values during the storage period.
Reliability of functional fitness tests in women from 60 to 80 years
J.S. Virtuoso Júnior,R.O. Guerra
Motricidade , 2011,
Abstract: The aim of the present study was to verify the reliability expressed by the internal consistency and stability of two series of specific functional fitness tests (AAHPERD and Fullerton) in elderly populations. Thirty-six women, mean age 68-year-old, were selected (SD = 6.64). Parameters of functional fitness evaluated were: body strength, flexibility, agility and dynamic balance, coordination, and aerobic endurance. Descriptive statistics were used to analyze the data and describe the sample (frequency, mean and standard deviation), and the intraclass correlation coefficient (ricc) was used to verify the concordance between the stability and internal consistency of the tests. Estimated intervals of 95% of reliability was adopted. In general, the two series showed acceptable rates of reliability, the ricc varying from 0.60 to 0.94. Fullerton test proved to be more consistent in the ricc of the proposed tests, mainly in relation to flexibility of the hip and the two-minute-stationary-walking test for the evaluation of aerobic endurance. Results allowed for the conclusion that both series of tests present acceptable levels of reliability.
Formulation and evaluation of domperidone pellets prepared by powder layering technology
Kibria Golam,Akhter Afsana,Ariful Islam K
Asian Journal of Pharmaceutics , 2010,
Abstract: The goal of the present study is to evaluate the influence of the formulation and operating conditions on pellet preparation by the pan technique. The effect of initial core weight on the physical parameters of pellets as well as to conduct stability study was also the goal of this study. For this domperidone maleate was selected as the model drug. Pellets were prepared by layering of powdered drug on sugar-based cores. Inert cores were intermittently treated with micronized drug powder and binding solution. This treatment led to the formation of multiple layers of drug particles around an inert core resulting in the production of pellets that can further be coated by different polymers to obtain modified release formulations. Scanning electron microscopy was employed to image the surface morphology of the prepared pellets. Drug loading efficiency, % yield, size, and shape uniformity of pellets were increased along with increasing the initial core weight. Drug content and dissolution study were performed by following HPLC and UV-Visible method. About 50% and 80% drug was released within 7.72 m and 13.66 m respectively in 0.1N HCl media (pH 1.2). Physical appearance of the prepared pellets, potency, moisture content, pellets size and shape, dissolution data, release rate constant, diffusion exponent (P< .05) over the stability period showed that the system is efficient for the production of highly stable formulations. This study also showed the good performance of the conventional coating pan system in obtaining instant release domperidone pellets prepared by the powder layering technique.
The Effect of Some Soil Physical and Chemical Properties on Soil Aggregate Stability in Different Locations in Sulaimani and Halabja Governorate  [PDF]
Salahaddin Abdulqadir Aziz, Saman Mahmood Karim
Open Journal of Soil Science (OJSS) , 2016, DOI: 10.4236/ojss.2016.64009
Abstract: Some soil properties were studied in relation soil aggregate along a climatologically region and different crop land use in the Northeast of Sulaimani City/Kurdistan Region of Iraq. Five locations were selected along these regions ranging from semiarid to sub-humid climatologically conditions. The soil physical, chemical properties, aggregate stability and size distribution were analyzed. A mean-weight-diameter (MWD) value was determined on 5 soils, which was the sum of the percentage of soil on each sieve (6, 3, 1.5, 0.75, 0.375 and 0.125 mm). The results of the measurements could evaluated with linear correlation coefficients for the relationships between aggregate stability (MWD) and soil physical and chemical properties of the different crop land use. The correlation coefficient for the relationship between aggregate stability and organic matter was highly significant (P < 0.0l%) which is in agreement with the findings of [1]. Generally large aggregates (large 6, 3, 3 - 1.5 mm) were present in highest proportions in the most semiarid of the studied areas. Aggregates 0.75 - 0.125 mm were positively correlated to fine, very fine sand and silt fractions and to organic matter. Stability of aggregates showed a positive correlation with clay content and organic matter content, while the carbonate content was strongly correlated with aggregate stability. The land use history affecting soil overlaps the pattern of climatological situations and cultivated crop lands and has to be taken into account. Aggregate size distribution and stability can be used as indicator of soil conservation and productivity.
Page 1 /15493
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.