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Articles by Zakaria Ahmed
Total Records ( 17 ) for Zakaria Ahmed
  A. K. M. Mahabubuzzaman , Latifa Binte Lutfar , M. K. Kabir and Zakaria Ahmed
  Drawing frame plays an important role on yarn quality. There are two types of processing line in jute spinning. One is conventional (traditional) and other is modern line (high speed). The difference between these two lines is due to the difference of drawing stages. In modern line mono-head high-speed type draw frame is in use, where in conventional line push-bar type draw frame is in use. The study was carried out to find out the effectiveness of the line in quality control of jute yarn. The effectiveness of mono-head high-speed type draw frame was better than conventional line push-bar type draw frame on the quality control of jute yarn.
  Zakaria Ahmed and Firoza Akhter
  Jute fibre quality depends to a very great extent on the process of retting. Much research has been done so far on retting of jute but still the jute growers face various practical difficulties in implementing the proper procedure for retting. Jute retting can be done by microbial or chemical process. Improper retting causes defective fibers which reduce the acceptability of these fibers for various industrial uses. Various methods have been devised for effective retting of jute which needs further research and development to systematize the entire retting process.
  Zakaria Ahmed , Hasina Banu , Firaza Akhter , . M. Faruquzzaman and Shamsul Haque
  Sugars have a long history of safe use in foods. They are common food ingredients that add taste appeal and perform important functions in foods. Besides its pleasant sweetness, sugar performs a host of less obvious and important functions in cooking, baking, candy making and the like. As carbohydrates, sugars are a contributor of calories for the body. The ability to produce solutions of varying degrees of sweetness is important in many food applications, particularly in beverages and confectionery. Low-calorie sweeteners add a taste that is similar to that of sucrose. Intense sweeteners are generally several times sweeter than sucrose. On the other hand, sugar replacers are the bulk and volume providing sweeteners usually less sweet than and different tasting from sugar, commonly used on a one-for-one replacement basis for sugar in recipes. Sugars have been studied extensively for their impact on a variety of issues.
  Zakaria Ahmed , Hasina Banu , M. Motiur Rahman , Firaza Akhter and M. Shamsul Haque
  In present world there is an increase in demand for organic waste disposal to minimize pollution and maximize resource recovery. Several workers from various parts of the world have reported successful conversion of waste materials to useful compost. Lignocellulose comprises three different polymer types: lignin, hemicellulose and cellulose. Bioconversion of lignocellulosic material through microbial enzyme to produce fermentable sugars has been given serious consideration and continuous research and development activities has been carried out in laboratories around the world. This article highlights the significant research findings and reviews the state of the art in this very important area of biotechnology.
  M. Shamsul Haque , Zakaria Ahmed , Firoza Akhter , M. Asaduzzaman , M. Motiur Rahman and M. A. Hannan
  Recently six varieties of jute were released from Bangladesh Jute Research Institute where two were from C. olitorius (OM-1 and OF-390) and four from C. capsularis (C-718, C-2035, C-2005 & C-2143). These varieties were compared for their retting properties, morphological differences as well as their physical properties of the fibre extracted from them. Among them, white fibre with fewer cuttings and “A” and “B” grade fibers were obtained by retting from C-718 and OF-390 varieties, respectively yielding higher quantity of fibers. Other varieties found inferior in quality in all aspects.
  Zakaria Ahmed , Hasina Banu , Firoza Akhter and Ken Izumori
  Hydrolysis of agricultural wastes of jute sticks and rice husks were studied to extract D-xylose. When jute sticks was used as substrate, 1N H2SO4 was found to be suitable for D-xylose extraction at boiling temperature after a period of 1h. 1N H2SO4 was also found best for D-xylose extraction from rice husks. No cellobiose was detected in hydrolysate
  Zakaria Ahmed
  Candida famata R28 showed potential growth at 36 h cultivated cells (absorbance 40 at 600 nm) for D-arabitol production on substrate concentration 5~20%. Among the various carbohydrates, highest growth was observed in medium containing D-glucose. In the production of D-arabitol, reaction gave 5.0% D-arabitol from 10.0% D-glucose without producing any by-product. The product was finally identified by HPLC analysis.
  Md. Shamsul Haque , Md. Asaduzzaman , Firoza Akhter and Zakaria Ahmed
  Isolated fungi of Aspergillus clavatus, Rhizopus sp., Zygorinchous sp., Sporotrichum sp., Trichoderma sp., Penicillium sp. and Curvularia sp. were tested for their retting efficacy on green jute ribbons. In laboratory condition as well as in field condition, Sporotrichum sp. retted green ribbons of jute (var. CVL-1) in 7 days whereas both Trichoderma sp and Curvularia sp. retted green ribbons in 11 days. In case of retting by Sporotrichum sp., no adverse effect on the fiber bundle strength and fiber yield was observed and according to Pressley Index, fiber strength was found to be 10.82 Ibs/mg and fiber yield was about 2.8 Kg out of 40 Kg green ribbons.
  Zakaria Ahmed , Firoza Akhter , M. Shamsul Haque , Hasina Banu , M. Motiur Rahman and A. K. M. Faruquzzaman
  Micropropagation consists of three types of vegetative propagation. It remains a popular research subject and thus continued research is definitely needed to increase the speed with which some plants can be produced giving a superior quality product.
  M. Shamsul Haque , M. Asaduzzaman , Firoza Akhter , M. A. Samad , Taher Baksh and Zakaria Ahmed
  Harvesting jute plants leaving 1``, 2", 3", 4", 5" and 6" from the basal portion in the soil and retted separately, produced significant effect on the production of jute cutting and fibre quality. Harvesting plants leaving 4"-6" from the soil eliminated cutting completely and produced A-grade fibre. But harvesting plants leaving 4"-6" of basal portion in the soil apprehend loss of fibre weight.
  M. Shamsul Haque , M. Asaduzzaman , Firoza Akhter , M. M. Hossain and Zakaria Ahmed
  An experiment was conducted in laboratory condition maintaining the ratio of plant stems and water at the range of 1:5, 1:10, 1:15, 1:20, 1:25 and 1:30 at a temperature 30°C. The best retting phenomena was observed at the ratio of 1:20. After the completion of retting in each ratio, fibre properties were measured and the best fibre was obtained at the ratio of 1:20. In the Retting top and bottom parts of the jute plants separately and malleting 40 cm of the basal part improved the fibre quality and showed more or less uniform retting. The cutting was completely eliminated through malleting and separately retting top and the bottom parts of the jute plants.
  Pankaj Kumar Bhowmik , Toshyuki Matsui and Zakaria Ahmed
  Changes in the activities of acid invertase and sucrose synthase during germination of wheat (Triticum aestivum L. cv. Kanchan) seeds were investigated. The activities of both acid invertase and sucrose synthase were changed during growth of seedlings. Until third day of germination their activities increased and thereafter decreased. The activity of acid invertase in the soluble fraction was higher than that of cell wall- bound fraction and for soluble fraction coleoptiles showed a significantly higher acid invertase activity than roots. But in the cell wall-bound fraction a higher activity was found in roots. Sucrose synthase activity was also higher in roots than in coleoptiles. Sucrose content was negatively correlated with the acid invertase activity in both coleoptiles and roots accounting well for the relation between substrate and the activity. Fructose content was significantly higher than the glucose and sucrose content and the amount of sugar was higher in roots than in coleoptiles.
  Firoza Akhter , Z. N. Tahmida , R. Mondal and Zakaria Ahmed
  The residual effect of a mixture of blue-green algae (Anabaena variabilis, Aulosira fertilissima, Scytonema sp., Calothrix javanica and Westiellopsis prolifica) on the growth and yield of two cultivars of rice (BR-3 and BR-7) grown in two consecutive seasons was studied. Four treatments were considered viz. No- Control, UN- Chemical fertilizer applied 24 hours before transplantation, AN- Algal mixture applied seven days after transplantation and UN+AN- Fertilizer and algal inoculum used together. Results showed positive residual effect in terms of leaf breadth and length, number of grain and yield of straw in t. Aman season. Increase in grain yield over control was recorded in Boro and t. Aman season following only AN treatment. Combined effect of UN+AN was much better over control in first, second and third crop respectively. Highest amount of nitrogen and protein content of rice grain, nitrogen uptake by grain, nitrogen content of plants and uptake of nitrogen by plant were recorded suggesting positive residual effect of algalization. Enhancement effect of nitrogen fixation by blue-green algae on the yield of rice was found to be significant at 5% level.
  F. A. H. Talukder , M. Mahbubul Islam , S. C. Chanda , Izaz Ahmed and Zakaria Ahmed
  Phenological events namely field duration, average flowering and pod maturation took longer period in Roselle, HS-24 at all the ten dates of sowing. Jute and Kenaf had shorter field duration, average flowering days and pod maturation days compared to Roselle. Field duration of the crop was longer in May 15 sowing in all the experimental materials. Plant height decreased consistently from May sowing to September sowing. Plant height in all the sowings was higher in Tossa than White Jute, Kenaf and Roselle. Seed crop could be sown from May 15 to September 30.
  M. Nasimul Gani , M. Monjurul Alam , A. K. M. Maqsudul Alam , S. Khandker and Zakaria Ahmed
  In a field experiment (1994-97), the water retention capacity, percentage of pore space of soil were increased and bulk density was reduced over control treatments due to addition of city waste compost (CWC). Incorporation of CWC in soil increased organic carbon (OC), nitrogen (N), phosphorus (P), and potassium (K) content over control. The organic matter content of soil found the highest rate, with CWC @ 5t/ha. The highest growth and yield of jute was recorded every year or on alternate year with CWC @ 4 t/ha over control and recommended dose of fertilizer.
  A.K.M. Mahabubuzzaman , Latifa Binte Lutfar , Md. Asaduzzaman , Md. Osman Gani Miazi , F.A. Dilruba and Zakaria Ahmed
  The spin Guard Gardella is a centrifugal type dry spinning machine. In this machine yarn can be spun from 72 (2.08 lbs./spy) to 241 tex (7 lbs./spy). But in this system of this machine, it is preferable to produce fine yarn. Here fine yarn 103 tex (3 lbs./spy) was produced in existing speed. Apron Draft Spinning frame was modified into ring spinning system. In this system rings and travelers were used and fine yarn upto 103 tex (3 lbs./spy) was produced. Bangla white B (BWB) grade jute fibres were used for producing fine yarn. The spinning performance and physical properties of produced yarn were found and compared. It was found that the yarn produced from Gardella spinning frame was better than modified ring spinning frame.
  A.K.M. Mahabubuzzaman , Latifa Binte Lutfar , Md. Asaduzzaman , F.A. Dilruba and Zakaria Ahmed
  An emulsion making process has been developed for spinning hessian type jute yarn by eliminating mineral oil from the normal sequence of emulsion processing. A number of experiments were carried out with jute fibers and 242 and 280 tex yarn were spun on the hessian spinning frame. It was observed that the elimination of mineral oil in emulsion processing did not make the yarn quality worse.
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