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Search Results: 1 - 10 of 3688 matches for " Mahfuzur Rahman "
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Morphological and Biochemical Changes in Ginseng Seedling Roots Affected with Stripe Symptoms  [PDF]
Zamir K. Punja, Mahfuzur Rahman
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.616257
Abstract: A unique symptom of longitudinal red stripes on the surface of one-year-old ginseng roots was studied to determine the morphological and biochemical changes taking place. Light and scanning electron microscopy, measurements of phenolic and mineral element content, and enzyme activity, were compared between healthy and stripe-affected root tissues. Light microscopy revealed that the root epidermis had ruptured and fissures extended for 3 - 4 cell layers into the cortex. Phenolic compounds accumulated in the epidermal cells which stained with Toluidine blue 0. Total phenolic content was higher in tissues from striped roots compared to healthy roots and HPLC profiles showed increases in a number of specific phenolic compounds. Analysis of epidermal tissues by SEM-EDX for mineral element content showed a marked increase in levels of iron, silicon and aluminum and a decline in potassium in striped root tissues. The activity of the enzymes phenylalanine ammonia lyase and peroxidase were also found to be higher in striped root tissues. Striping of ginseng roots is a physiological condition caused by a rupture of the epidermis due to rapid growth of underlying cells, which results in phenolic accumulation and sequestration of several minerals. Further oxidation causes a visible red striping on the root surface.
Clinico-Demographic Characteristics of Intestinal Tuberculosis in Pre-Operative Unsuspected Laparotomy as Incidental Findings in Bangladesh  [PDF]
Md. Mizanur Rahman, Ayub Ali, Md. Abdullah Yusuf, Md. Zamil Zaidur Rahim, Md. Mahfuzur Rahman, Zahir-ul Islam
Journal of Tuberculosis Research (JTR) , 2017, DOI: 10.4236/jtr.2017.52015
Abstract: Background: Clinical presentation of intestinal tuberculosis is varied. It is also essential to know the clinical and demographic characteristics of incidentally detected intestinal tuberculosis patient. Objective: The purpose of the present study was to find out the clinic-demographic characteristics of intestinal tuberculosis in clinically and preoperatively unsuspected laparotomies. Methodology: This cross-sectional study was carried out in the Department of Surgery at Dhaka Medical College Hospital, Dhaka from March 2002 to March 2004 for a period of two (2) years. All the patients underwent laparotomy presented without any suspicion of pulmonary or intestinal tuberculosis were included as study population. Patients who were without the history of cough, haemoptysis, antitubercular drug therapy were included. Per operative suspicion was raised due to enlarged lymph nodes in mesentery, omental masses, ileocaecal masses, suspicious growth in ileum, omental thickening, perforation suspected by tuberculosis. Biopsy was taken from suspicious lesions. Histopathology was confirmed the tubercular lesion. Results: A total number of 300 patients under laparotomy were recruited for this study of which 38 positive cases were found in the study with a percentage of 12.7%. Maximum affected age group was 21 to 30 years which was 16 (42%) cases. Male was predominant to female which was 28 (73.7%) cases and 10 (26.3%) cases respectively. Low socioeconomic people are affected more (76.3%). Most common presentation in positive cases was acute and sub-acute intestinal obstruction 20 (52.6%) followed by intestinal perforation (26.31%). Conclusion: In conclusion young age male patient is the most commonly affected intestinal tuberculosis which is frequently presented with sub-acute intestinal obstruction among the preoperatively unsuspected laparotomy patients.
Mother s Health Seeking Behaviour at Rajshahi District
Mahfuzur Rahman,Rashed Alam,Tapan Kumar Roy,Abdul Goni
Pakistan Journal of Social Sciences , 2012,
Abstract: The study based on primary data collected from Rajshahi District. The aim of this study is to identify the factors related with the utilization of mother s health seeking behavior in Rajshahi. ANC, delivery care, taking Iron tablet, TT injection and Vitamin-A were considered here as utilization of services. This study revealed that fifty percent women were working and more than 50% (61.1%) gave birth in their middle aged (20-34 years). ANC services were very poor during pregnancy time. Logistic regression technique was employed to detect the significant factors for utilization of services. The important significant factors are: Mother s age, residence, education, economic standard of family, contraceptive use, mass media exposure and visits of health worker. The interesting findings showed that access to delivery in hospital/clinic are very poor. Urban and high economic standard mothers were more likely to utilize services than their rural and low economic standard. This study will help policy makers to take initiative for rural vulnerable mothers.
Parameter Compensation for Mel-LP based Noisy Speech Recognition
Md. Mahfuzur Rahman,Md. Robiul Hoque,M. Babul Islam
Research Journal of Information Technology , 2012,
Abstract: This study deals with a noise robust distributed speech recognizer for real-world applications by deploying feature parameter compensation technique. To realize this objective, Mel-LP based speech analysis has been used in speech coding on the linear frequency scale by applying a first-order all-pass filter instead of a unit delay. To minimize the mismatch between training and test phases, Cepstral Mean Normalization (CMN) and Blind Equalization (BEQ) have been applied to enhance Mel-LP cepstral coefficients as an effort to reduce the effect of additive noise and channel distortion. The performance of the proposed system has been evaluated on Aurora-2 database which is a subset of TIDigits database contaminated by additive noises and channel effects. The baseline performance, that is, for Mel-LPC the average word accuracy for test set A has found to be 59.05%. By applying the CMN and BEQ with the Mel-LP cepstral coefficients, the performance has been improved to 68.02 and 65.65%, respectively.
Evaluation of Biochemical Changes in Chronic Arsenic Poisoning among Bangladeshi Patients
A. H. M. Nurun Nabi,M. Mahfuzur Rahman,Laila N. Islam
International Journal of Environmental Research and Public Health , 2005, DOI: 10.3390/ijerph2005030002
Abstract: An estimated 40 million people in Bangladesh have been suffering from arsenic toxicity-related diseases because of drinking water contamination with high levels of naturally occurring arsenic. To evaluate the biochemical changes in chronic arsenic exposure, a total of 115 exposed subjects diagnosed as arsenicosis patients were examined and interviewed, and 120 unexposed volunteers were enrolled in this study. Drinking water, urine and peripheral blood samples were collected from all participants and analyzed. The average levels of arsenic in the drinking water and spot urine samples of the arsenicosis patients were 218.18g/L and 234.68g/L, respectively, and duration of exposure was 7.6 ± 5.2 yrs that ranged from 1-25 yrs. Prevalence of diabetes mellitus among chronic arsenic-exposed subjects was about 2.8 times higher than the unexposed subjects. The activities of alkaline phosphatase were significantly elevated in the patients, 197 U/L compared to 149 U/L in the controls, but alanine transaminase and aspartate transaminase were mostly normal. The patients had significantly lower levels of serum creatinine, 0.97 mg/dL compared to 1.15 mg/dL in the controls; but had significantly elevated levels of total protein, 84 g/L and 77 g/L respectively. The mean level of inorganic phosphate in the serum of arsenicosis patients was 6.4 mg/dL compared to 4.6 mg/dL in the unexposed subjects and the level was significantly higher, indicating substitution of the pentavalent arsenate for the phosphate ion causing underutilization of the latter. Evaluation of the lipid profiles showed while the levels of triacylglycerol were not much different, the patients had significantly lower levels of cholesterol, HDL-cholesterol and LDL-cholesterol compared to the unexposed subjects. These findings suggest significant changes in biochemical parameters in human arsenic toxicity.
Association of Clinical Complications with Nutritional Status and the Prevalence of Leukopenia among Arsenic Patients in Bangladesh
Laila N. Islam,AHM Nurun Nabi,M Mahfuzur Rahman,Monsur A. Khan,Azizul I. Kazi
International Journal of Environmental Research and Public Health , 2004, DOI: 10.3390/ijerph2004020074
Abstract: This study conducted in Bangladesh reports the relationship of clinical complications with nutritional status and the prevalence of leukopenia among arsenic exposed patients living in the rural villages. A total of 115 exposed individuals diagnosed as arsenicosis patients were randomly selected from four known arsenic endemic villages, and age-matched 120 unexposed subjects were enrolled in the study program. The duration of arsenic exposure in about 37% of the patients was at least 10 yrs, while the population mean and range were 7.6 ± 5.2 yrs, and 1 – 25 yrs, respectively. The mean arsenic concentrations in the drinking water for the exposed and unexposed (control) population were 218.1 μg/L and 11.3 μg/L, respectively. The spot urine sample of the arsenicosis patients contained an average of 234.6 μg/L arsenic. Although very few patients showed elevated WBC count, 16% had leukopenia (below normal count), and the whole population had significantly low WBC count than the control subjects. Prevalences of neutropenia and lymphocytosis were observed in patients with chronic exposure to high levels of arsenic in water. The body mass index was found to be lower than 18.5, the cut-off point for malnutrition (underweight), in about 28% of the arsenicosis cases compared to 15% of the controls. The monthly income and total calorie consumption per day showed the patients were underprivileged than the controls. Arsenical symptoms and complications were more severe in the nutritionally vulnerable (underweight) patients than the overweight ones. Also, the incidences of leukopenia and anaemia were more common in the female patients who were underweight. The findings of this research demonstrate that the poor nutritional status of patients increases the complications of chronic arsenic toxicity; suggest the possibility of other sources of arsenic contamination different from drinking water in the study area; and establish a higher prevalence of leukopenia and lymphocytosis in arsenicosis patients.
Three Layer Hierarchical Model for Chord
Waqas A. Imtiaz,Shimul Shi,A.K.M Mahfuzur Rahman
International Journal of Advanced Computer Sciences and Applications , 2012,
Abstract: Increasing popularity of decentralized Peer-to-Peer (P2P) architecture emphasizes on the need to come across an overlay structure that can provide efficient content discovery mechanism, accommodate high churn rate and adapt to failures in the presence of heterogeneity among the peers. Traditional p2p systems incorporate distributed client-server communication, which finds the peer efficiently that store a desires data item, with minimum delay and reduced overhead. However traditional models are not able to solve the problems relating scalability and high churn rates. Hierarchical model were introduced to provide better fault isolation, effective bandwidth utilization, a superior adaptation to the underlying physical network and a reduction of the lookup path length as additional advantages. It is more efficient and easier to manage than traditional p2p networks. This paper discusses a further step in p2p hierarchy via 3-layers hierarchical model with distributed database architecture in different layer, each of which is connected through its root. The peers are divided into three categories according to their physical stability and strength. They are Ultra Super-peer, Super-peer and Ordinary Peer and we assign these peers to first, second and third level of hierarchy respectively. Peers in a group in lower layer have their own local database which hold as associated super-peer in middle layer and access the database among the peers through user queries. In our 3-layer hierarchical model for DHT algorithms, we used an advanced Chord algorithm with optimized finger table which can remove the redundant entry in the finger table in upper layer that influences the system to reduce the lookup latency. Our research work finally resulted that our model really provides faster search since the network lookup latency is decreased by reducing the number of hops. The peers in such network then can contribute with improve functionality and can perform well in P2P networks.
Effects of Plant Growth Regulators on Callus Proliferation, Plantlet Regeneration and Growth of Plantlets of Doritaenopsis Orchid
Israt Chowdhury,Abu Reza Md. Mahfuzur Rahman,M. Obaidul Islam,S. Matsui
Biotechnology , 2003,
Abstract: Supplement of 2,4-D and BAP into New Phalaenopsis (NP) medium was not effective for the growth of callus in Doritaenopsis orchid. Among the different combinations of BAP and NAA, 5.0 mg l-1 BAP + 0.1 mg l-1 NAA highly enhanced PLB formation from calli. For plantlet initiation from PLBs 0.5 mg l-1 BAP was suitable and higher concentration was inhibitory. Similar effect to that of BAP was found for NAA (0.5 mg l-1) and BAP + NAA (0.5 mg l-1 + 0.5 mg l-1) in plantlet initiation. For in vitro growth of plantlets, 0.5 mg l-1 of BAP was the best for leaf and shoot growth compared to that of for BAP and NAA. However, for root growth of plantlets 1.0 mg l-1 BAP + 1.0 mg l-1 NAA was the most suitable.
Magneto-optical metamaterial
Mehdi Sadatgol,Mahfuzur Rahman,Ebrahim Forati,Miguel Levy,Durdu O. Guney
Physics , 2015,
Abstract: We propose a new class of metamaterials called magneto-optical metamaterials that offer enhanced angle of rotation in polarization compared to bulk magneto-optical materials. In the proposed approach, the permittivity tensor of a magneto-optical material is tailored by embedded wire meshes behaving as artificial plasma. We have shown that the angle of rotation in the magneto-optical metamaterial can be enhanced up to 9 times compared to bulk magneto-optical material alone while the polarization extinction ratio remains below -20dB and insertion loss is less than 1.5dB.
Effects of Carbohydrates on Callus Growth and Callus Derived Plantlet Regeneration in Doritaenopsis Orchid
Abu Reza Md. Mahfuzur Rahman,M. Obaidul Islam,A.K.M. Azad-ud-doula Prodhan,Syoichi Ichihashi
Biotechnology , 2005,
Abstract: Doritaenopsis callus utilized sucrose, maltose and sorbitol as energy sources for the growth and development, where each carbohydrate elicited a different response. Calli on sucrose supplemented New Phalaenopsis (NP) medium grew well and remained friable, bright yellow and translucent, similar to source calli, but turned green and produced Protocorm Like Bodies (PLBs) on maltose and sorbitol supplemented media. Sucrose supplemented medium was the best for callus growth over maltose and sorbitol. The initiation of PLBs from calli on maltose medium was the highest followed by sorbitol medium while the sucrose medium did not produce PLB. Sorbitol affected most intensively plantlet regeneration from PLBs over maltose and sucrose. However, maltose supplemented medium markedly enhanced the subsequent growth and development of regenerated mini plantlets over sorbitol and sucrose media.
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