Bangladesh Journal of Scientific and Industrial Research最新文献_第3页

Optimization of alkali concentration in the pretreatment of sugarcane bagasse for ethanol production 甘蔗渣生产乙醇预处理中碱浓度的优化

Bangladesh Journal of Scientific and Industrial Research Pub Date : 2023-06-22 DOI: 10.3329/bjsir.v58i2.66990

S. Sujan, M. Hossain, M. Uddin, A. Fakhruddin

{"title":"Optimization of alkali concentration in the pretreatment of sugarcane bagasse for ethanol production","authors":"S. Sujan, M. Hossain, M. Uddin, A. Fakhruddin","doi":"10.3329/bjsir.v58i2.66990","DOIUrl":"https://doi.org/10.3329/bjsir.v58i2.66990","url":null,"abstract":"This study was aimed for the investigation of the effect of pretreatment procedure of alkaline, based on the chemical arrangement, surface morphology, structural composition and enzymatic assimilation of sugarcane bagasse for sugars and ethanol production. Alkali pretreatment (0 to 8% w/v of NaOH) assists to reduce the lignin portion (from 19.57±0.03% to 9.91±0.02%) and increase the cellulose content of the treated SB (from 34.66±0.05% to 63.58±0.05%) simultaneously. The optimal conditions for alkali pretreatment were 8% NaOH charge at 100oC for 90 min. Enzymatic digestibility of alkali treated SB was significantly improved and hydrolysis yield reached to 89.59% glucose and 61.23% xylose at an prime level using Trichoderma viridae. Further hydrolysate of 8% (w/v) alkali treated SB sample was fermented by Saccharomyces cerevisiae to convert sugar into ethanol and yield was 16.81±0.32% in 24 h. Alkali pretreatment was found to be a treatment of choice for cellulose hydrolysis in SB and subsequent sugar acquired for the production of ethanol during fermentation.\u0000Bangladesh J. Sci. Ind. Res. 58(2), 89-98, 2023","PeriodicalId":8735,"journal":{"name":"Bangladesh Journal of Scientific and Industrial Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43363205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mineral nutrition of rice and post-harvest soils influenced by self-made organic composts 自制有机堆肥对水稻及采后土壤矿质营养的影响

Bangladesh Journal of Scientific and Industrial Research Pub Date : 2023-06-22 DOI: 10.3329/bjsir.v58i2.64570

Sumana Akter, M. H. Khan, M. Saha

引用次数: 0

Changes in physical properties of some proprietary safflower (Carthamus tinctorius L.) cultivars after film coating application 部分红花品种涂膜后物理性质的变化

Bangladesh Journal of Scientific and Industrial Research Pub Date : 2023-06-22 DOI: 10.3329/bjsir.v58i2.60570

Zeynep Dumanoğlu

引用次数: 0

Effect of the temperature and osmotic stress on the growth and cell viability of Candida maltosa 温度和渗透胁迫对麦芽糖念珠菌生长和细胞活力的影响

Bangladesh Journal of Scientific and Industrial Research Pub Date : 2023-06-22 DOI: 10.3329/bjsir.v58i2.63347

Mohammad Nazrul Islam Bhuiyan, KR Raiyaan, S. Afrin, M. Nahid

{"title":"Effect of the temperature and osmotic stress on the growth and cell viability of Candida maltosa","authors":"Mohammad Nazrul Islam Bhuiyan, KR Raiyaan, S. Afrin, M. Nahid","doi":"10.3329/bjsir.v58i2.63347","DOIUrl":"https://doi.org/10.3329/bjsir.v58i2.63347","url":null,"abstract":"The present research attempted to observe the temperature and osmotic stress effects on yeast species in cheese. The Candida maltosa yeast was isolated from locally made raw cheese samples, and it was identified by its biochemical properties, followed by using the BIOLOGTM microbial identification system to confirm species level identification. The study investigate about Candida maltosa's ability to grow and develop a budding pattern under high temperatures up to 44°C and osmotic stress for 72 h. Osmotic stress tolerance was studied at 32.5°C in different concentrations of dextrose (0.04 g/l, 0.12 g/l, 0.2 g/l, 0.28 g/l, and 0.36 g/l) and sucrose (0.02 g/l, 0.06 g/l, and 0.36 g/l), respectively. Cell growth of the C. maltosa was measured by optical density at 600nm (OD600) and the enumeration of colony forming units (CFUs) on the agar plates up to 300 m. The obtained result indicated the optimal growth pattern at 32.5°C and complete growth retardation at 44°C with the high concentrations of dextrose (0.36 g/l) and sucrose (0.38 g/l). Particularly, C. maltosa budding could only survive 240 m at 37°C to 40°C and was suppressed at 44°C. The experimental findings demonstrated the stress response in yeast cells in the phenotypic level with the existing acquaintance on the osmotic stress response actions in C. maltosa.\u0000Bangladesh J. Sci. Ind. Res. 58(2), 71-78, 2023","PeriodicalId":8735,"journal":{"name":"Bangladesh Journal of Scientific and Industrial Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43958453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Molecular characterization and antimicrobial resistance of Escherichia coli in dairy products of Dhaka, Bangladesh 孟加拉国达卡乳制品中大肠杆菌的分子特征和耐药性

Bangladesh Journal of Scientific and Industrial Research Pub Date : 2023-06-22 DOI: 10.3329/bjsir.v58i2.64033

G. Hasan, M. Satter, K. S. Ahmed

引用次数: 0

Potential of low-grade fluorite ore of Landi Kotal, Khyber Pakhtunkhwa Province, Pakistan 巴基斯坦开伯尔-普赫图赫瓦省Landi Kotal低品位萤石矿石的潜力

Bangladesh Journal of Scientific and Industrial Research Pub Date : 2023-06-22 DOI: 10.3329/bjsir.v58i2.64607

Muhammad Arif Bhatti, U. Zafar, A. Mehmood, Rashid Mehmood, S. Nasir

{"title":"Potential of low-grade fluorite ore of Landi Kotal, Khyber Pakhtunkhwa Province, Pakistan","authors":"Muhammad Arif Bhatti, U. Zafar, A. Mehmood, Rashid Mehmood, S. Nasir","doi":"10.3329/bjsir.v58i2.64607","DOIUrl":"https://doi.org/10.3329/bjsir.v58i2.64607","url":null,"abstract":"This paper describes the results of a beneficiation study conducted on low-grade fluorite ore. The study was aimed at the development of a suitable beneficiation process to produce chemical grade fluorite concentrate. The representative sample of the ore was up-graded by leaching and flotation process. The important parameters of froth flotation process were optimized to obtain highest grade and recovery of fluorite concentrate. A single-factor variation method was applied to get the optimum conditions of the process. The rougher concentrate was reground to liberate fine locked fluorite particles and two cleaning flotation were employed in close circuit to achieve higher grade concentrate. A process flowsheet was designed in the light of these tests. After optimization of process parameters, the fluorite ore containing 62.24% CaF2 could be upgraded to a concentrate assaying 97.55% CaF2 with an overall recovery of 92.73%. The prepared fluorite concentrate meets the specifications of chemical grade and is suitable for production of fluoride based chemicals.\u0000Bangladesh J. Sci. Ind. Res. 58(2), 107-118, 2023","PeriodicalId":8735,"journal":{"name":"Bangladesh Journal of Scientific and Industrial Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41608326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis of MgO nanostructure thin films via electrodeposition method for gas sensing applications 电沉积法制备气敏用MgO纳米结构薄膜

Bangladesh Journal of Scientific and Industrial Research Pub Date : 2023-06-22 DOI: 10.3329/bjsir.v58i2.64166

N. Lal, Ajay Kumar, Kanhaiya Chawla, Sandeep Sharma, C. Lal

{"title":"Synthesis of MgO nanostructure thin films via electrodeposition method for gas sensing applications","authors":"N. Lal, Ajay Kumar, Kanhaiya Chawla, Sandeep Sharma, C. Lal","doi":"10.3329/bjsir.v58i2.64166","DOIUrl":"https://doi.org/10.3329/bjsir.v58i2.64166","url":null,"abstract":"Magnesium oxide has long been intriguing due to several significant phenomena, including wide laser emission, spin electron reflectivity, and defect-induced magnetism. MgO nanostructures have a variety of applications, from spintronics to wastewater treatment, depending on their size and shape. Mg is sensitive material for hydrogen and forms MgH2, so we used Mg/MgO as a sensor to sense hydrogen gas in the present work. Magnesium oxide thin films were synthesized by electrodeposition technique using magnesium nitrate salt. XRD results suggested that the deposited thin films have a face-centered cubic structure. X-ray photoelectron spectroscopy was used to detect the elemental composition and chemical state with the general electronic structure of the sample. The morphology and growth of deposited nanostructure with elemental mapping of the thin film were investigated by SEM-EDS. The UV-visible analysis shows the calculated band gap for MgO thin filmwas 4.16 eV which is in the ultraviolet region. The I-V characteristics have been studied to find out the effect of hydrogenation on the synthesized MgO nanostructure and the sensitivity responseof about 31%. It is quiteevident that MgO nanostructure may be used for gas sensing applications (such as H2 gas).\u0000Bangladesh J. Sci. Ind. Res. 58(2), 119-128, 2023","PeriodicalId":8735,"journal":{"name":"Bangladesh Journal of Scientific and Industrial Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48475724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Biodiesel from moringa stenopetala seed oil 辣木籽油制备生物柴油

Bangladesh Journal of Scientific and Industrial Research Pub Date : 2023-03-27 DOI: 10.3329/bjsir.v58i1.62772

GY Shage, A. Ali

{"title":"Biodiesel from moringa stenopetala seed oil","authors":"GY Shage, A. Ali","doi":"10.3329/bjsir.v58i1.62772","DOIUrl":"https://doi.org/10.3329/bjsir.v58i1.62772","url":null,"abstract":"The aim of this paper is the production and characterization of biodiesel from Moringa stenopetala seed oil. Biodiesel is a renewable, biodegradable, and nontoxic biofuel. Moringa stenopetala seed oil is a potential feedstock that has not been discovered as an energy source. This study investigated the effects of process parameters: methanol to oil ratio, reaction temperature, and catalyst loading on the yield and quality of biodiesel. The experimental results showed that the maximum biodiesel yield was 94% and it was obtained at optimum process conditions: temperature 55°C, methanol to oil ratio 6:1, and catalyst loading1.0. Biodiesel product was characterized based on international standards for testing fuels. According to the findings of the study, moringa stenopetala seed oil biodiesel has a specific gravity of 0.874 g/mole, a kinematic viscosity of 4.8 mm2/s, an acid value of 0.4 mg KOH/g, a saponification value of 196 mg KOH/g, FFA 0.2%, iodine value 104.5 high heating value 10,287 cal/g, flash Point 184°C, pour point 1°C, cloud point 10°C and cetane number 53. These results satisfy international standards for biodiesel.\u0000Bangladesh J. Sci. Ind. Res. 58(1), 35-44, 2023","PeriodicalId":8735,"journal":{"name":"Bangladesh Journal of Scientific and Industrial Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45051268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tannin agents from native Swietenia microphylla (sky fruit) for leather processing 土产小叶甜果鞣酸剂用于皮革加工

Bangladesh Journal of Scientific and Industrial Research Pub Date : 2023-03-27 DOI: 10.3329/bjsir.v58i1.65108

M. Hashem, S. Payel, MS Ali, P. Bhowmik, M. Sahen

{"title":"Tannin agents from native Swietenia microphylla (sky fruit) for leather processing","authors":"M. Hashem, S. Payel, MS Ali, P. Bhowmik, M. Sahen","doi":"10.3329/bjsir.v58i1.65108","DOIUrl":"https://doi.org/10.3329/bjsir.v58i1.65108","url":null,"abstract":"In leather processing, retanning is considered one of the most important steps which play a key role in the final leather. The retanning agent improves the required physicomechanical properties of the final leather. In this study, an alternative retanning agent is extracted from the native Swietenia macrophylla (sky fruit). The solvent extracted tannin from the sky fruit was characterized by Fourier Transform Infrared (FT-IR) speactroscopy. The tannin content of the sky fruit was 8.09%. The leather retanned with tannin extracted from sky fruit was compared with the conventional one. The physicomechanical properties-tensile strength, elongation at break (%), stitch tear strength, and shrinkage temperature fulfilled the requirements. The organoleptic properties of the retanned leather e.g., softness, fullness, grain smoothness, grain break, general appearance, and uniformity were evaluated in comparison with the conventional retanned leather. The extraction of retanning agent from the native sky fruit could be an alternative source of vegetable tannin which is locally and available.\u0000Bangladesh J. Sci. Ind. Res. 58(1), 01-08, 2023","PeriodicalId":8735,"journal":{"name":"Bangladesh Journal of Scientific and Industrial Research","volume":"131 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41265172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Antimicrobial activities of Cassia sophera L. extract 决明提取物的抗菌活性

Bangladesh Journal of Scientific and Industrial Research Pub Date : 2023-03-27 DOI: 10.3329/bjsir.v58i1.65115

S. Aziz, M. Sorowar, S. Parveen, MA Satter Miah, S. Siddique, MH Ara Begum

{"title":"Antimicrobial activities of Cassia sophera L. extract","authors":"S. Aziz, M. Sorowar, S. Parveen, MA Satter Miah, S. Siddique, MH Ara Begum","doi":"10.3329/bjsir.v58i1.65115","DOIUrl":"https://doi.org/10.3329/bjsir.v58i1.65115","url":null,"abstract":"This study investigates the antibacterial activities of a variety of extracts from several parts of Cassia sophera L. which include the stem, leaf, flower, and seed from n-hexane, chloroform, ethyl acetate, and methanol extract. The disc diffusion method, at a concentration of 300 μg/disc, was employed to test the extracts against several pathogenic microorganisms. Some of the extracts were antibacterial against the bacteria tested, with inhibition zones ranging from 7.0 to 25.0 mm in diameter. In comparison to a streptomycin standard sample, the organic extracts showed almost identical activity in a few cases. The ethyl acetate extract of the seed had the highest activity against Sarcina sp. and Pseudomonas aeruginosa, with inhibition zones of 25.0 mm and 23.0 mm in diameter, respectively. Methanol extract of the flower was most effective against Bacillus cereus (inhibition zone of 18.0 mm), while chloroform extract of the leaf was most effective against Bacillus cereus (inhibition zone of 18.5 mm). The result of present research is expressing the high potency of various parts of the plant extracts to stop the growth of bacteria and this extract can be further suggested for medical utilization and could be used as natural antimicrobial source.\u0000Bangladesh J. Sci. Ind. Res. 58(1), 45-52, 2023","PeriodicalId":8735,"journal":{"name":"Bangladesh Journal of Scientific and Industrial Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44459403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0