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Static bending and moisture response of cement-bonded particleboard produced at different levels of percent chemical additive content in board
Published 2012Subjects: “…cement bondedparticle board additive concentration…”
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Impact of metabolic Acidosis on the dialysis dose: findings from a two center cross-sectional study in a low income population setting.
Published 2021Subjects: “…Predialysis serum Bicarbonate Concentration.…”
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Effect of technology and musical sound on concentration in individualized learning: a study of covenant university students
Published 2012-04Subjects: “…Concentration…”
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Page will reload when a filter is selected or excluded.- Binder concentration 2 results 2
- Chloride concentration 2 results 2
- Concentration 2 results 2
- Minimum Inhibitory Concentration 2 results 2
- Minimum inhibitory concentration 2 results 2
- Quality 2 results 2
- "Market, Structure 1 results 1
- A study was carried out to determine the optima level of percent additive concentration for wood cement board production from mixed tropical hardwoods species. Eight hardwood species used for the study are: Triplochiton scleroxylon K. Schum (Obeche). Terminalia ivorensis A. Chev. (Idigbo) Terminalia superb Eng. & Diets (Afara) Bruchystegia nigerica Hoyle & A.P.D. Jones (Okwen) Khaya ivorensis A. Chev. (Lagos Mahogany) Nesogordonia papaverifeni A. Chev. (Dantu-Oro) Tectona grandis Linn. F. (Teak) Gmelina arborea Roxb. (Gmelina). The experimental boards were made at five chemical additive content levels of 1.00%: 1.50%: 2.00%: 2.50% and 3.00% based on dry weight of cement in board, and three cement/wood mixing ratio levels of 2.25: 1.0. 2.50: 1.0 and 2.75:1.0. The experimental design is a two-factor factorial experiment, a combination of which manifested in 15 treatment combinations. The mean moduli of Rupture and Elasticity (MOR and MOE) obtained for each of the 15 treatment combinations in this experiment ranged from 3.28 to 10.46 N/mm2 while MOE values ranged from 2200 to 4010 N/mm2. The mean percent water absorption (WA) values ranged from 24.66 to 46.37% while the thickness swelling (TS) ranged from 0.98 to 3.62%. Statistical analysis showed chemical additive concentration and wood/cement ratio were found significant at 1% level of probability on the flexural and moisture properties. Stronger, stiffer and more dimensionally stable boards were produced at increasing levels of these two production variables. Also percent chemical additive content in board of 3.0% (Based on dry cement weight in board) performed best. 1 results 1
- Activity concentrations 1 results 1
- Agar plate 1 results 1
- Ageratum conyzoides 1 results 1
- Anion Gap 1 results 1
- Antimicrobial activity 1 results 1
- Arsenite is a major environmental toxicant that is well known to cause reproductive injury. The sperm protective potential of Ageratum conyzoides Linn in arsenic-treated rats was carried out in this study taking advantage of the antioxidant constituents and its androgenic activities. Twenty-four male albino rats aged 16 weeks, weighing 225 to 228g were used. They were grouped into 4(A-Da) with each group containing 6 rats. Group A was orally treated with 100mg/kg ethanol leaf extract of Ageratum conyzoides L., daily for 14 days, group B (single oral dose of sodium arsenite 2.5 mg/kg body weight), C (Ageratum conyzoides extract daily for 14 days and sodium arsenite (SA) given on the 14th day) and group D (Propylene glycol as negative control). It was observed that group B had a lower (p<0.05) percentage motility (26.7±6.67%) when compared across the groups while group A had a significantly higher (p<0.05) mean value (63.3±3.33%). The sperm motility of rats in group D was significantly higher (p<0.05) than groups B and C. This implies that A. conyzoides extract had no adverse effect on the sperm motility of the rats and also ameliorates the adverse effect of arsenite on sperm motility. The mean value obtained for sperm liveability, semen volume and Sperm concentration followed a similar pattern although, the differences were not significant (p>0.05) for semen volume and the Sperm concentration of rats across the groups. The total sperm abnormality obtained across the groups ranges between 10.44 and 14.27% with group B treated with sodium arsenite (SA) having the highest value when compared with groups A and D, although, the differences were not significant (P>0.05). The study concluded that ethanol leaf extract of Ageratum conyzoides has no negative effect on sperm motility, liveability characteristics and morphology and also protected spermatozoa against arsenic reproductive toxicity in Wistar strain albino rats. 1 results 1
- Attributes 1 results 1
- Background: Metabolic acidosis (MA) still remains a very common finding in patients with end stage kidney disease (ESRD) despite the increasing volume of research on dialysis treatment that have resulted in improved haemodialysis delivery. Its occurrence increases the risk of dialysis termination and inadequate dialysis dose that is associated with poor treatment outcome. The study endeavored to study metabolic acidosis and to determine its relationship with the dialysis dose (Kt/V). Materials and Methods: This was a two centre cross-sectional study involving 298 participants with ESKD who had 1642 sessions of maintenance haemodialysis. Serum electrolytes were analyzed by the Ion-Selective Electrode method and haematocrit was determined using a Hematocrit Centrifuge Results: Two hundred and ninety eight (192 males and 106 females) participants took part with a mean age of 51.44 + 7.31 years (males, 51.18 + 4.62 years, females, 52.14 + 2.93 years), P=0.04. The mean serum bicarbonate concentration, post dialysis (20.61 ± 6.26 mmol/L) was significantly higher than the pre dialysis, 18.41 ± 3.63 mmol/L (P<0.001) concentration. The prevalence of pre and post dialysis metabolic acidosis were 79.0% and 38.3% (P<0.001) There was a significant reduction in the mean anion gap following dialysis (P<0.001). The mean dialysis dose was significantly higher in males than females (P=0.03) and in participants with normal PSBC than participants with low PSBC (P<0.001) Risk factors for metabolic acidosis were advancing age, elevated Body Mass Index and blood pressure. Metabolic acidosis was negatively related to glomerular filtration rate and haematocrit. Aging, lesser dialysis frequency, independently predicted metabolic acidosis Conclusion: Metabolic acidosis is quite common in patients on maintenance dialysis, more common in females, advancing age and in less frequent dialysis treatment. Its occurrence increased the risk of inadequate dialysis. 1 results 1
- Background: Solanum dasyphyllum is a plant with several ethno-medicinal uses and to date, there is little scientific validation of its folkloric claims compared to other species of the Solanaceae family. Objective: This study determined the antimicrobial and antioxidant potential of methanol extract and fractions of the leaves of S. dasyphyllum and identified the phyto-constituents using GC-MS technique. Methods: Crude methanolic extract of S. dasyphyllum leaves were subjected to Phytochemical screening and liquid-liquid fractionation. Crude extracts and fractions were subjected to antimicrobial screening, including minimum inhibitory concentrations (MICs) and minimum bactericidal/fungicidal concentrations (MBC/MFC) determination, time-kill kinetics study, antioxidant activity and Gas Chromatography-Mass Spectrometry (GCMS) analysis. Results: Phytochemicals present included flavonoids, alkaloids, saponins, cyanogenic glycosides, tannins and reducing sugars. Antimicrobial activities were recorded against all the isolates (Staphylococcus aureus, Bacillus subtilis, Escherichia coli, Pseudomonas aeruginosa, Aspergillus niger, Rhizopus spp., Candida albicans and Penicillium spp.) with MIC between 0.25 and >4 mg/mL, MBC of 1 and >4 mg/mL and MFC of 0.5 and >4 mg/mL. Time-kill kinetics study showed dichloromethane and ethylacetate fractions to be bactericidal. Crude extract displayed moderate antioxidant (IC50 = 425.51μg/mL) and GC-MS analysis showed 29 metabolites, including phenols and polyphenols derivatives, benzofuranone derivative and esters of decanoic acid derivatives, all of which are known to have anti-infective and anti-oxidant properties. Conclusion: This study therefore elucidates the potentials of the Solanum dasyphyllum plant as a good source of bioactive compounds including those with anti-infective and antioxidant properties. 1 results 1
- Beef 1 results 1
- Binary liquid alloys 1 results 1
- Binary liquid alloys have found wide applications in electronics, communications, automotive and aerospace technologies. The development of new alloys and improvement of existing ones require accurate knowledge of thermodynamic variables of the constituent systems which may not be obtainable experimentally. Hence, there is always the need for theoretical investigation to complement experiment. This study was aimed at theoretical determination of the thermodynamic properties of nine binary liquid alloys. Nine liquid alloys (Al-Zn, Bi-In, Ga-Zn, Ga-Mg, Al-Ga, Sb-Sn, In-Pb, Ga-Tl and Al-Si) with insufficient theoretical investigation were selected for investigation using three different models. Quasi-lattice theory which connects thermodynamic and dynamical properties was employed to determine the concentration concentration fluctuation in the long-wavelength limit [Scc(0)], chemical short range order parameter (α1), free energy of mixing (GM), the concentration dependence of diffusion and viscosity of Al-Zn and Bi-In liquid alloys. Quasi-chemical approximation model for strongly interacting systems was used to investigate ordering and glass formation tendencies in Ga-Zn, Ga-Mg and Al-Ga binary alloys. A statistical thermodynamic theory was used to determine the mixing properties of Sb-Sn, In-Pb, Ga-Tl and Al-Si liquid alloys. The choice of model was influenced by the type of available experimental data. The Scc(0) and α1 showed that a reasonable degree of chemical order existed in Bi-In system, while Al-Zn liquid alloys exhibited a liquid miscibility gap or phase separation at all concentrations. The values of free energy of mixing at the equiatomic composition were -0.4986RT and -0.9344RT for Al-Zn and Bi-In alloys respectively. The free energy of mixing of Ga-Zn, Al-Ga and Ga-Mg alloys are almost symmetrical around the equiatomic composition with Ga-Mg being the most interacting, while Al-Ga is more interacting than Ga-Zn alloy. Apart from Ga-Mg alloys with negative enthalpy of mixing, both the enthalpy of mixing and entropy of mixing of the three Ga-based systems are positive and symmetrical about the equiatomic composition. In the concentration range 0 ≤ cAl ≤ 0.3 and 0.7 ≤ cAl ≤ 1, Al-Ga systems exhibited a glass-forming potential. The free energy of mixing, enthalpy of mixing and entropy of mixing of Sb-Sn and Al-Si liquid alloys exhibited negative deviations from ideality and were symmetric around the equiatomic composition, while In-Pb and Ga-Tl systems exhibited positive deviations with Ga-Tl alloys showing asymmetry behaviour. The compound formation in liquid phase was weaker in Al-Zn than in Bi-In alloys. The Sb-Sn and Al-Si liquid alloys had tendency for heterocoordination, while In-Pb and Ga-Tl exhibited homocoodination. The Ga-Zn and Al-Ga alloys exhibited homocoordination, whereas Ga-Mg alloys had tendency towards heterocoodination. 1 results 1
- Binder type 1 results 1
- Borassus aethiopum 1 results 1
- Brine Concentration 1 results 1
- Briquettes 1 results 1
- Ceramic tiles 1 results 1
- Coastal aquifer 1 results 1
- Coastal aquifers 1 results 1
- Coefficient of inequality" 1 results 1
- Combustion 1 results 1
- Comprehension 1 results 1
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