Abul.hasnat@my.westminster.ac.uk Hasnat | University of Westminster (original) (raw)

Papers by Abul.hasnat@my.westminster.ac.uk Hasnat

Archives of Disease in Childhood, 1992

International Journal of Epidemiology, 1991

To identify the prognostic indicators and risk factors for increased duration of acute diarrhoea ... more To identify the prognostic indicators and risk factors for increased duration of acute diarrhoea and for occurrence of persistent diarrhoea (i.e. acute episodes lasting longer than 14 days) in children under three years, a systematic sample (3690) of patients attending a large treatment centre in Bangladesh was analysed using multiple regression, logistic regression and stratified (Mantel-Haenszel) analysis. Significant prognostic indicators or risk factors for increase in duration of acute diarrhoea, after adjusting for confounders, include bloody or mucoid diarrhoea, concomitant signs of chest infection, presence of vitamin A deficiency signs, decreased weight for age, routine use of contaminated surface water, lack of breastfeeding and increasing age; presence of rotavirus or enterotoxigenic Escherichia coli or Vibrio cholerae 01 in stool had negative association. In logistic regression and stratified analysis these factors, except for lack of breastfeeding and age, were also found to be risk factors or prognostic indicators of persistent diarrhoea. Policy implications of these findings for programmes to reduce morbidity and mortality from persistent diarrhoea include development of effective vaccines against dysentery-causing Shigella, programmes to prevent vitamin A deficiency, protein energy malnutrition and acute respiratory infections in children, and long-term programmes to provide clean water for all day-to-day needs.

Journal of Structural Engineering-asce, 1988

ABSTRACT

Journal of Structural Engineering-asce, 1987

Progress in Organic Coatings, 2006

In situ epoxidation of linseed oil (LO) was carried out as per previously reported method. Epoxid... more In situ epoxidation of linseed oil (LO) was carried out as per previously reported method. Epoxidised oil (LOE) was further hydroxylated (HLOE) and cured with butylated melamine formaldehyde (BMF), in varying weight percentages (10-30 wt.% on the weight of epoxy resin) to develop coating materials. Structural elucidation of HLOE and HLOE-BMF system was performed by IR, 1 H NMR and 13 C NMR spectroscopic analyses. Physico-chemical characterization was carried out by standard methods. Thermal stability and curing behaviour of these systems were investigated by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC), respectively. HLOE-BMF systems were applied over mild steel strips of standard sizes to evaluate their physico-mechanical and chemical resistance performance. It was found that, among all resin compositions, HLOE-30 exhibited far better coating properties.

Journal of Applied Polymer Science, 2001

Coatings prepared from polyesteramide resin synthesized from linseed oil, a renewable resource, h... more Coatings prepared from polyesteramide resin synthesized from linseed oil, a renewable resource, have been found to show improved physicomechanical and anticorrosive characteristics. These properties are further improved when aluminum is incorporated in the polyesteramide resin. The coatings of this resin are generally obtained by baking at elevated temperatures. With a view toward the use of linseed oil, as a precursor for the synthesis of polyesteramide resins and to cure their coatings at ambient temperature, toluylene diisocyanate (TDI) was incorporated into polyesteramide and alumina-filled polyesteramide in varying proportions to obtain urethane-modified resins. The latter resins were found to cure at room temperature. The broad structural features of the urethane-modified polyesteramide and alumina-filled polyesteramide were confirmed by FTIR and 1H–NMR spectroscopies. Scratch hardness; impact resistance; bending resistance; specular gloss; and resistance to acid, alkali, and organic solvents of the coatings of these resins were determined by standard methods. Physicomechanical and anticorrosive properties, specular gloss, and thermal stability of the urethane-modified alumina-filled polyesteramide coatings were found to be at higher levels among these resins. It was found that TDI could be incorporated in polyesteramide up to only 6 wt %, such that above this loading its properties started to deteriorate, whereas alumina-filled polyesteramide could take up to 10 wt % TDI. Explanation is provided for the increase in scratch hardness and impact resistance above 6 and 10 wt % addition of TDI in polyesteramide and alumina-filled polyesteramide, respectively, as well as for the decrease in flexibility and resistance to solvents, acid, and alkali of coatings of these resins above these limits of TDI addition. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 1855–1865, 2001

Journal of Applied Polymer Science, 2005

Diglycidyl ether of bisphenol A acrylate (DAC) and diglycidyl ether of bisphenol A methacrylate (... more Diglycidyl ether of bisphenol A acrylate (DAC) and diglycidyl ether of bisphenol A methacrylate (DMAC) were synthesized by the reaction of an epoxy [diglycidyl ether of bisphenol A (DGEBA)] with acrylic acid and methacrylic acid, respectively. The synthesized resins were characterized by determination of the acid, hydroxyl, and saponification values. Structure elucidation was done by gel permeation chromatography, Fourier transform infrared spectroscopy, 1H-NMR spectroscopy, and 13C-NMR spectroscopy. DACs were cured with melamine formaldehyde resin at low pH values. The pH of the resin systems was adjusted with phosphoric acid. The coatings of these systems were formed on mild steel specimens for physicomechanical and chemical/corrosion-resistance performance. The coatings of DAC and DMAC showed excellent scratch hardness and good impact-resistance performance. The coatings of DMAC showed better performance than DAC with respect to chemical and corrosion resistance. Thermogravimetric analysis and differential scanning calorimetry were used to investigate the thermal stability and curing behavior of these systems. DAC showed a little higher glass-transition temperature than DMAC and also showed a higher thermal resistivity. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 95: 494–501, 2005

Progress in Crystal Growth and Characterization of Materials, 2002

Polyurethane resins are a class of thermosetting polymers largely used in high performance surfac... more Polyurethane resins are a class of thermosetting polymers largely used in high performance surface coatings and paints. Fast depletion of petroleum stock and increase in their cost puts limit to their use in future for production of petroleum-based resins. Consequently the need for utilization of renewable resources as substitute to petrochemicals is pressing. We have attempted to synthesize polyurethane (PU) from linseed oil epoxy and have developed from it an anticorrosive coating. Trans hydroxylation of linseed oil epoxy was carried out in situ after a reported method. It was further reacted with toluylene diisocyanate to synthesize polyurethane. Physico-chemical characterization of the synthesized resin was carried out as per standard methods. Structural elucidation was carried out using IR, NMR spectral data. Physico-mechanical and weather resistance performance of the coated samples were also studied .It was found that the synthesized resin showed good performance in various corrosion tests. These studies show that the material holds promise for use as an effective anticorrosive coating compound.

Progress in Organic Coatings, 2003

Oil from P. glabra was extracted and characterized. It was first converted into N,N-bis(2-hydroxy... more Oil from P. glabra was extracted and characterized. It was first converted into N,N-bis(2-hydroxyethyl ) P. glabra fatty amide (HEPGA), which was further transformed into polyesteramide (PGPEA, P. glabra polyesteramide) by reacting with the phthalic acid. Characterization of ...

Biological Trace Element Research, 2010

The purpose of the study was to determine the serum concentration of trace elements of panic diso... more The purpose of the study was to determine the serum concentration of trace elements of panic disorder patients and to find out the relationship between trace element levels and nutritional status or socio-economic factors. The study was conducted among 54 panic disorder patients and 52 healthy volunteers. Patients were recruited from Bangabandhu Sheikh Mujib Medical University by random sampling. Serum trace element concentrations were determined by flame atomic absorption spectroscopy (for Mg, Zn, Ca, and Cu) as well as graphite furnace (for Mn). Data were analyzed by independent t test, Pearson’s correlation analysis, regression analysis, and ANOVA. The serum concentration of Mn, Zn, Ca, Cu, and Mg in panic disorder patients were 0.37 ± 0.30, 0.67 ± 0.20, 99.91 ± 15.15, 0.83 ± 0.23, and 21.14 ± 3.72 mg/L, while those were 0.4163 ± 0.2527, 0.86 ± 0.3, 106.6073 ± 18.6531, 0.8514 ± 0.3646, and 21.37 ± 2.03 mg/L in control subjects, respectively. The serum concentration of Zn decreased significantly (p = 0.001) in patient group. But the differences of the concentration of Mn, Ca, Cu, and Mg between patient and control group were not significant (p = 0.522, p = 0.065, p = 0.800, and p = 0.712, respectively). Socio-economic data reveal that most of the patients were very poor and middle aged. Mean BMIs of the control group (23.74 ± 2.71 kg/m2) and the patient group (22.62 ± 3.74 kg/m2) were within the normal range (18.5–25.0 kg/m2). There was no significant relationship between serum zinc level and BMI of patients (r = 0.038; p = 0.809). So the decreased level of serum zinc in panic disorder patients was not because of other reasons, but rather it may provide a prognostic tool for the diagnosis and treatment of this disease.

Biological Trace Element Research, 2009

The purpose of the study was to determine the concentration of trace elements present in scalp ha... more The purpose of the study was to determine the concentration of trace elements present in scalp hair sample of schizophrenic patients and to find out the relationship between trace elements level and nutritional status or socioeconomic factors. The study was conducted among 30 schizophrenic male patients and 30 healthy male volunteers. Patients were recruited from Bangabandhu Sheikh Mujib Medical University by random sampling. Hair trace element concentrations were determined by flame atomic absorption spectroscopy and analyzed by independent t test, Pearson’s correlation analysis, regression analysis, and analysis of variance (ANOVA). Mn, Zn, Ca, Cu, and Cd concentrations of schizophrenic patients were 3.8 ± 2.31 μg/gm, 171.6 ± 59.04 μg/gm, 396.23 ± 157.83 μg/gm, 15.40 ± 5.68 μg/gm, and 1.14 ± 0.89 μg/gm of hair sample, while those of control subjects were 4.4 ± 2.32 μg/gm, 199.16 ± 27.85 μg/gm, 620.9 ± 181.55 μg/gm, 12.23 ± 4.56 μg/gm, and 0.47 ± 0.32 μg/gm of hair sample, respectively. The hair concentration of Zn and Ca decreased significantly (p = 0.024; p = 0.000, respectively) and the concentration of Cu and Cd increased significantly (p = 0.021; p = 0.000, respectively) in schizophrenic patients while the concentration of Mn (p = 0.321) remain unchanged. Socioeconomic data reveals that most of the patients were poor, middle-aged and divorced. Mean body mass indices (BMIs) of the control group (22.26 ± 1.91 kg/m2) and the patient group (20.42 ± 3.16 kg/m2) were within the normal range (18.5−25.0 kg/m2). Pearson’s correlation analysis suggested that only Ca concentration of patients had a significant positive correlation with the BMI (r = 0.597; p = 0.000) which was further justified from the regression analysis (R 2 = 44%; t = 3.59; p = 0.002) and one-way ANOVA test (F = 3.62; p = 0.015). A significant decrease in the hair concentration of Zn and Ca as well as a significant increase in the hair concentration of Cu and Cd in schizophrenic patients than that of its control group was observed which may provide prognostic tool for the diagnosis and treatment of this disease. However, further work with larger population is suggested to examine the exact correlation between trace element level and the degree of disorder.