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Search Results: 1 - 10 of 672789 matches for " S. A. A. Sajadi "
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A Comparative Investigation of Lead Sulfate and Lead Oxide Sulfate Study of Morphology and Thermal Decomposition  [PDF]
S. A. A. Sajadi
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.22024
Abstract: The compound lead oxide sulfate PbSO4.PbO was prepared in our laboratory. The Thermal behavior of PbSO4 was studied using techniques of Thermogravimetry under air atmosphere from 25 to 1200°C. The identity of both compounds was confirmed by XRD technique. Results obtained using both techniques support same decomposition stages for this compound. The electron microscopic investigations are made by SEM and TEM. The compound is characterized by XRD and the purity was determined by analytical Methods. Also a series of thermogravimetric analysis is made and the ideal condition is determined to convert this compound to pure lead oxide.
Metal ion-binding properties of L-glutamic acid and L-aspartic acid, a comparative investigation  [PDF]
S. A. A. Sajadi
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.22013
Abstract: A comparative research has been developed for acidity and stability constants of M(Glu)1, M(Asp)2 and M(Ttr)3 complexes, which have been determined by potentiometric pH titration. Depending on metal ion-binding properties, vital differences in building complex were observed. The present study indicates that in M(Ttr) com-plexes, metal ions are arranged to the carboxyl groups, but in M(Glu) and M(Asp), some metal ions are able to build chelate over amine groups. The results mentioned-above demonstrate that for some M(Glu) and M(Asp) complexes, the stability constants are also largely determined by the affinity of metal ions for amine group. This leads to a kind of selectivity of metal ions, and transfers them through building complexes accompanied with glutamate and aspartate. For heavy metal ions, this building complex helps the absorption and filtration of the blood plasma, and consequently, the excursion of heavy metal ions takes place. This is an important method in micro-dialysis. In this study the different as-pects of stabilization of metal ion complexes regarding to Irving-Williams sequence have been investigated.
Equilibria and Stability in Glycine, Tartrate and Tryptophan Complexes, Investigation on Interactions in Cu(II) Binary and Ternary Systems in Aqueous Solution  [PDF]
S. A. A. Sajadi
Open Journal of Inorganic Non-metallic Materials (OJINM) , 2014, DOI: 10.4236/ojinm.2014.41001
Abstract:

The acidity and stability constants of M(Gly)1, M(Ttr)1, and M(Trp)1 M: Cu2+, Cu(Bpy2)2+, and Cu(Phen3)2+ complexes, were determined by potentiometric pH titration. It is shown that the stability of the binary Cu(L), (L: Gly, Ttr, and Trp) complex is determined by the basicity of the carboxylate group on one side and amino group on the other side. It is demonstrated that the equilibrium, Cu(Ha4)2+ + Cu(L) \"\"Cu(Har)(L) + Cu2+, is displacement due to the well known experience that mixed ligand complexes formed by a divalent 3d ion, a heteroaromatic N base and an O donor ligand possess increased stability. The stability constants of the 1:1 complexes formed between Cu2+, Cu(Bpy)2+ or Cu(Phen)2+

Complex Bilding Behavior of 2 ((4-Methyl-5-Nitro-6- (Pyrolidine-1-yl)Pyrimidine-2-yl)Amino)Propionic Acid in Aqueous Solution  [PDF]
S. A. A. Sajadi, G. Bagherzadeh, M. Kermane, M. Khaleghian
Open Journal of Inorganic Non-metallic Materials (OJINM) , 2013, DOI: 10.4236/ojinm.2013.31002
Abstract:

The acidity constants of MNPPAP1 were determined by potentiometric pH titration. The stability constants of the 1:1 complexes formed between M2+: Ca2+, Mg2+, Mn2+, Co2+, Ni2+, Cu2+ or Zn2+ and MNPPAP2-, were determined by potentiometric pH titration in aqueous solution (I =0.1 M, NaNO3, 25). The order of the stability constants was reported. It is shown that the stability of the binary M(MNPPAP) complexes is determined by the basicity of the carboxyl or amino group. All the stability constants reported in this work show the usual trend. The obtained order is Ca2+ < Mg2+ > Mn2+ < Co2+ < Ni2+ < Cu2+ > Zn2+. The observed stability order for MNPPAP follows approximately the Irving-Williams sequence. It is shown that regarding to M ion-binding properties vital differences on complex bilding were considered. It is demonstrated, that in M-MNPPAP complexes, M ion is coordinated to the carboxyl group, M ion is also able to bild macrochelate over pyrimidine group. The up mentioned results demonstrate that for M-MNPPAP complex the stability constants is also largely determined by the affinity of M2+ for carboxyl group. It is shown that MNPPAP can exert a direct influence on reaction mechanism through different kinds of metal ions and donor groups of MNPPAP.

The Metal Ions Absorption – and Transportation Properties of L-Aspartic Acid in the Body
S. Ali A. Sajadi and Ali A. Alamolhodavia
The Open Conference Proceedings Journal , 2010, DOI: 10.2174/2210289201001010207]
Abstract: The intra molecular interactions in complexes of Aspartic acid with divalent metal ions (Mg, Ca & Zn) M(Asp)1 were investigated in this work. The acidity constants of Asp and stability constants of M(Asp) are determined and reported as well. The effect of intra molecular interactions can be seen by comparison of these stability constants. Mg and Ca ions form weaker bonds to Asp than Zn ion. Zn(Asp) complex undergoes an intra molecular interaction and builds a chelate in two forms ( an open – isomer M(Asp)op and a closed – isomer M(Asp)cl ). The concentration independent intra molecular interaction constant for two isomers has been calculated and reported. The obtained results demonstrate that for some M(Asp) complexes the stability constant is largely affected by the affinity of metal ions for amine group. This shows a kind of selectivity of metal ions and transfer them via complex – building with the aspartate. Also all three metal ions complexes could be considered as mineral carriers. These complexes can release the minerals in human body in certain conditions ( e,g. pH – range).
Housewives’ Obesity Determinant Factors in Iran; National Survey - Stepwise Approach to Surveillance
S Navadeh,L Sajadi,A Mirzazadeh,F Asgari
Iranian Journal of Public Health , 2011,
Abstract: "nBackground: Women suffer more from obesity than men in Iran do. In this study, we compared obesity risk and its con-tributors regarding the job categories as housewives (HWs) or employees to deeply explore the risk of obesity in house-wives in Iran."nMethods: Based on WHO stepwise approach, in 2005, 33472 women aged 15 to 65 years old (excluding all men) were ex-amined for the major risk factors for non-communicable diseases. Obesity was determined by Body Mass Index>30kgm-2 in adults (>20 years) and by girl BMI percentiles according to WHO 2007 Growth Reference 5-19 years in adolescents. We modeled obesity by logistic regression and entered all the known/potential predictors, including job categories."nResults: The participation rate was more than 99%. The weighted prevalence of overweight and obesity in HWs were 34.5% and 24.5% respectively. Employed women were about 4% and 10% less overweight and obese than the HWs, respec-tively (P< 0.01). HWs vs. employed women had the adjusted OR 1.39 (CI95%, 1.18-1.63) for obesity. Older women, with higher educational level and socioeconomic status, lower physical activities and those living in urban areas were at risk of obesity. In comparison to HWs, working as an Official Clerk (OR=0.66) associated with a decrease in odds of obe-sity significantly, while others did not."nConclusion: Being as HW is an independent significant factor for obesity in women. Preventive health care programs to re-duce risk of obesity in women should be applied, considering their occupation for achieving more effectiveness.
Ternary complexes in solution. Intramolecular hydophobic and stacking interactions in mixed ligand complexes formed by copper (II), 2,2'-bipyridyl or 1,10-phenanthroline, and n-butyl diphosphate (BuDP3-) or phenyl diphosphate (PhDP3-)
S. Ali A. Sajadi,Bin Song,Fridrich Gregan,Helmut Sigel
Bulletin of the Chemical Society of Ethiopia , 1997,
Abstract:
Social Responsibility in Hospitals of Isfahan City
A Barati Marani,HS Sajadi,M Keivanara
Payavard Salamat , 2011,
Abstract: Background and Aim: Hospital's traditional charter that mostly emphasized productivity has been replaced by a charter that stresses social and environmental issues. On this basis, to achieve success, managers should regard both the inner and the outer environments of hospitals. This study aims at measuring hospitals' social responsibility.Materials and Methods: The present descriptive-analytic study was carried out through a cross-sectional method in 2010. The study population consisted of hospital managers of the city of Isfahan (n=21). The data collection instrument was a researcher-made questionnaire. The instrument's content validity was determined by the experts' views and its reliability calculated through Cronbach's α was found to be 0.95. The collected data were analyzed using SPSS software (version 16) and the hypotheses were tested by t-test, ANOVA and Eta coefficients. The maximum mean score was 100.Results: The mean score of hospitals' social responsibility was computed to be 68.6. The mean scores of leadership and inner processes, market place, community policies, environmental policies, and workplace policies were found to be 72.2, 70, 67.8, 67.4 and 66.2, respectively. There was no significant relationship between hospital's social responsibility and type of hospital's possession and activity (pvalue > 0.05).Conclusion: The social responsibility of hospitals was assessed as moderate. To improve hospital's social responsibility, it is suggested that more attention be paid to workplace and environmental policie.
"The effects of polysorbate surfactants on the structure of mucus Glycoproteins "
Sajadi Tabassi A,Martin GP,Marriott Ch
DARU : Journal of Pharmaceutical Sciences , 2001,
Abstract: A dynamic oscillatory technique was used to assess the effect of polysorbate non-ionic surfactants on mucus rheology. Adherent mucus gel was scraped from the surface mucosa of pig stomachs and purified by gel exclusion chromatography followed by ultrafiltration and gelation. Rheological measurements of this gel were carried out on a Carri-Med Controlled Stress Rheometer. Appropriate volumes of surfactant solution were added to weighed samples of mucus gel so that a final concentration of 20 mM surfactant was achieved in a gel containing 8% w/w solids content. Polysorbate 20 (PS20), polysorbate 40 (PS40), polysorbate 60 (PS60) and polysorbate 80 (PS80) all decreased both storage (elastic) modulus G’ and loss (viscous) modulus G’’ significantly at 10 Hz (PPS20>PS60>PS40. The mechanisms by which surfactants disturb the mucus structure are not fully understood, nonetheless, they could possibly affect the mucus gel properties by causing depletion of the glycoprotein constituents such as non-mucin proteins and mucin associated lipids. This might lead to the conclusion that polysorbates, by reducing the viscoelasticity of mucus gel could alleviate its barrier properties and facilitate the diffusion of concomitantly administered drugs via mucus gel.
SOCIAL PHOBIA PREVALENCE IN YOUNGS
AHMAD REZA ZAMANI,H TABAN,A SAJADI,A HEIDARZADEH
Journal of Research in Medical Sciences , 2003,
Abstract: Introduction: The most common psychiatric disorder of new communities are the anxiety disorders. In this survey Isfahans' high school students' social phobia were assessed as an important part of anxiety disorders. Methods & Materials: In this cross sectional study, 500 high school students (250 male, 250 female) whom selected by multi-stage cluster and simple random sampling, were enrolled into study. Data collection performed by multiple choice question are and analysis were done by SPSS software with 0.05 significance level. Results: 11 percents of selected students with mean age about 16 Yrs, have had Social Phobia (male=56.4%, female=43.6 % ). Parents' education of affected group were higher than non-affected, and birth rank had significant relation with Social Phobia (P = 0.043). Conclusions: Unfortunately in spite of high prevalence of social phobia, It's remain unknown and affected students would have numerous educational and communicational problems because of this disorder, therefore for complications' prevention and on time treatment, its need to inform people and physicians about this disorder and its' diagnose.
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