Pub Date : 2023-02-19DOI: 10.3329/dujbs.v32i1.64186
Md Sagir Ahmed, S. K. Datta, Tonmoy Saha, Durjoy Raha Antu, Anindita Barua, Sumaiya Ahmed
Slipper lobster Thenus indicus Leach, 1816 (Crustacea: Decapoda: Scyllaridae) has been recorded for the first time from Cox’s Bazar coast of the Bay of Bengal. The species was taxonomically identified by using the traditional morphometric method which was further validated by molecular approach based on partial cytochrome c oxidase subunit I (COI) and 16S rRNA gene sequences (DNA barcodes). The key characteristics of this species are spotless pereiopods, 1st pereiopod merus width less than 7% of carapace length, and 3rd pereiopod merus length more than 45% of carapace length. Dhaka Univ. J. Biol. Sci. 32(1): 11-19, 2023 (January)
{"title":"New record of slipper lobster Thenus indicus Leach, 1816 (Crustacea: Decapoda: Scyllaridae) from Bangladesh waters","authors":"Md Sagir Ahmed, S. K. Datta, Tonmoy Saha, Durjoy Raha Antu, Anindita Barua, Sumaiya Ahmed","doi":"10.3329/dujbs.v32i1.64186","DOIUrl":"https://doi.org/10.3329/dujbs.v32i1.64186","url":null,"abstract":"Slipper lobster Thenus indicus Leach, 1816 (Crustacea: Decapoda: Scyllaridae) has been recorded for the first time from Cox’s Bazar coast of the Bay of Bengal. The species was taxonomically identified by using the traditional morphometric method which was further validated by molecular approach based on partial cytochrome c oxidase subunit I (COI) and 16S rRNA gene sequences (DNA barcodes). The key characteristics of this species are spotless pereiopods, 1st pereiopod merus width less than 7% of carapace length, and 3rd pereiopod merus length more than 45% of carapace length.\u0000Dhaka Univ. J. Biol. Sci. 32(1): 11-19, 2023 (January)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89053307","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}
Pub Date : 2023-02-19DOI: 10.3329/dujbs.v32i1.64187
Zannatun Nahar Jhinu, Rita Parveen, Md Aminul Islam Bhuiyan, A. J. Howlader
The study was conducted to identify the protozoan parasites in a freshwater indigenous air breathing fish, Heteropneustes fossilis (Bloch, 1794). The host fish was collected during mid of the April 2018 to end of the March 2019 from freshwater bodies of Mymensingh, Kishoregonj, Faridpur, Jashore, Manikganj and Bogura districts of Bangladesh. Three species of phylum myxozoa namely Henneguya singhi, Henneguya qadrii, Henneguya mystusia, one species of phylum ciliophora namely Trichodina siddiquae and two species of phylum mastigophora namely Trypanosoma singhii and Piscinoodium pillulare were identified in H. fossilis. The parasites of all infected hostswere observed in gill, body slime and blood, however gillswere commonly infected by parasites rather than body slime and blood. Three species of parasite Piscinoodium pillulare, Henneguya qadrii and Henneguya mystusia were first recorded in this host fish and novel locality record in Bangladesh. H. fossilis was found to be infected over the three major (p<0.05) (summer, rainy and winter) seasons and demonstrated a strong significant association (P0<05) with season during the study period. In H. fossilis, highest variety and highest number of parasites were found in winter season, prevalence and intensity was found 78.31% and 5.17 respectively. Lowest prevalence and intensity were found in rainy season respectively 45.87 and 4.72. Among all the parasites Henneguya singhi was common in all the three seasons and its rate of infection was found elevated in summer (20.69%) and rainy season (19.27%). In H. fossilis prevalence of female fish were highest in all the three seasons, summer (55.22%), rainy (50.75%) and winter (85.57%) than their male counterparts 38.76%, 38.09% and 68.12%, respectively. Dhaka Univ. J. Biol. Sci. 32(1): 21-32, 2023 (January)
{"title":"A Brief Account on Protozoan Infection in Asian Stinging Catfish, Heteropneustes Fossilis (Bloch, 1794) In Different Seasons of Bangladesh","authors":"Zannatun Nahar Jhinu, Rita Parveen, Md Aminul Islam Bhuiyan, A. J. Howlader","doi":"10.3329/dujbs.v32i1.64187","DOIUrl":"https://doi.org/10.3329/dujbs.v32i1.64187","url":null,"abstract":"The study was conducted to identify the protozoan parasites in a freshwater indigenous air breathing fish, Heteropneustes fossilis (Bloch, 1794). The host fish was collected during mid of the April 2018 to end of the March 2019 from freshwater bodies of Mymensingh, Kishoregonj, Faridpur, Jashore, Manikganj and Bogura districts of Bangladesh. Three species of phylum myxozoa namely Henneguya singhi, Henneguya qadrii, Henneguya mystusia, one species of phylum ciliophora namely Trichodina siddiquae and two species of phylum mastigophora namely Trypanosoma singhii and Piscinoodium pillulare were identified in H. fossilis. The parasites of all infected hostswere observed in gill, body slime and blood, however gillswere commonly infected by parasites rather than body slime and blood. Three species of parasite Piscinoodium pillulare, Henneguya qadrii and Henneguya mystusia were first recorded in this host fish and novel locality record in Bangladesh. H. fossilis was found to be infected over the three major (p<0.05) (summer, rainy and winter) seasons and demonstrated a strong significant association (P0<05) with season during the study period. In H. fossilis, highest variety and highest number of parasites were found in winter season, prevalence and intensity was found 78.31% and 5.17 respectively. Lowest prevalence and intensity were found in rainy season respectively 45.87 and 4.72. Among all the parasites Henneguya singhi was common in all the three seasons and its rate of infection was found elevated in summer (20.69%) and rainy season (19.27%). In H. fossilis prevalence of female fish were highest in all the three seasons, summer (55.22%), rainy (50.75%) and winter (85.57%) than their male counterparts 38.76%, 38.09% and 68.12%, respectively.\u0000Dhaka Univ. J. Biol. Sci. 32(1): 21-32, 2023 (January)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85670645","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}
Pub Date : 2023-02-19DOI: 10.3329/dujbs.v32i1.64189
M. R. Rabby, Roufun Naher
Student mental health in the university setting has been an expanding concern. The COVID-19 pandemic could be detrimental to the psychological wellness of university students. The aim of this investigation was to see the mental health outcomes of Dhaka University students during the COVID-19 outbreak. A crosssectional survey using a convenient sampling technique was conducted among 193 students of the University of Dhaka within a time duration of 1 month. Data was gathered by utilizing the web survey including DASS-21BV, demographic questions, and health-related queries with respect to COVID-19. The prevalence of anxiety symptoms and depressive symptoms was 64.2 % and 66.9%, respectively, and 51.8% of students reported mild to extremely severe levels of stress. Age group was significantly associated with DASS-21 depression subscale scores (χ2 (2)> =14.179, p= .007). Hall status was also significantly associated with DASS-21 anxiety subscale scores (χ2 (2)> =10.001, p= .040). Sleep-related queries with respect to COVID-19 were significantly associated with DASS-21 anxiety subscale scores (χ2 (2)> =24.135, p= .002). COVID-19-related queries on attention, enthusiasm, mental state, and self-confidencewere also significantly associated with depressive symptoms, anxiety symptoms, and stress levels (p<.001). The COVID-19 outbreak seems to have had a considerable psychological impact on Dhaka University students and would be benefited greatly through adequate support from the relevant authorities to cope with the situation mentally. Dhaka Univ. J. Biol. Sci. 32(1): 45-55, 2023 (January)
{"title":"Impact of COVID-19 on Mental Health of Dhaka University Students","authors":"M. R. Rabby, Roufun Naher","doi":"10.3329/dujbs.v32i1.64189","DOIUrl":"https://doi.org/10.3329/dujbs.v32i1.64189","url":null,"abstract":"Student mental health in the university setting has been an expanding concern. The COVID-19 pandemic could be detrimental to the psychological wellness of university students. The aim of this investigation was to see the mental health outcomes of Dhaka University students during the COVID-19 outbreak. A crosssectional survey using a convenient sampling technique was conducted among 193 students of the University of Dhaka within a time duration of 1 month. Data was gathered by utilizing the web survey including DASS-21BV, demographic questions, and health-related queries with respect to COVID-19. The prevalence of anxiety symptoms and depressive symptoms was 64.2 % and 66.9%, respectively, and 51.8% of students reported mild to extremely severe levels of stress. Age group was significantly associated with DASS-21 depression subscale scores (χ2 (2)> =14.179, p= .007). Hall status was also significantly associated with DASS-21 anxiety subscale scores (χ2 (2)> =10.001, p= .040). Sleep-related queries with respect to COVID-19 were significantly associated with DASS-21 anxiety subscale scores (χ2 (2)> =24.135, p= .002). COVID-19-related queries on attention, enthusiasm, mental state, and self-confidencewere also significantly associated with depressive symptoms, anxiety symptoms, and stress levels (p<.001). The COVID-19 outbreak seems to have had a considerable psychological impact on Dhaka University students and would be benefited greatly through adequate support from the relevant authorities to cope with the situation mentally.\u0000Dhaka Univ. J. Biol. Sci. 32(1): 45-55, 2023 (January)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79910390","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}
Pub Date : 2023-02-19DOI: 10.3329/dujbs.v32i1.64196
M. Saha, M. H. Khan, Sumana Akter, Md. Bayazid Hossain
A field experiment was carried out to investigate the effects of vermicompost (0, 10, and 15 tha-1), climatic elements i.e. soil moisture (50%, 70%, and 100%) and elevation of soil temperature (1 to 20C) on the physico-chemical properties and nutrient availability of post-harvest calcareous-acid mixed soils after rice production. A total of 18 treatments assembling the afore-mentioned doses was applied. The analyses of the soils demonstrated significant variation in effects (p ≤0.05) of the treatments on both the available nutrient status and the physicochemical properties of soils. Except for available sulfur; soil pH, EC, organic carbon (OC), available nitrogen, phosphorous, potassium, calcium, and sodium were detected in the higher amounts in 1:1 (calcareous : acid-soils) mixed soils than those of 1:3 mixed counterpart both in initial and post-harvest soil conditions. The highest levels of soil pH, OC, available P and Zn were determined in the treatment T13. Whereas, treatment T6 proved to be the best dose for the highest availability of Ca and Mg. The treatments T1, T2, T11, and T16 were recorded to have the lower OC, available N, P, Ca, Mg, Zn and S contents in soils. In particular, the availability of Na was found to be in lesser amounts in all the subplots. In a nutshell, most of the treatments exerted favourable influence in maintaining a healthy level of soil physico-chemical parameters owing to their inherent characteristics. Dhaka Univ. J. Biol. Sci. 32(1): 119-134, 2023 (January)
{"title":"Integrated effects of vermicompost, climatic factors and soil mixing on selected soil fertility indicators","authors":"M. Saha, M. H. Khan, Sumana Akter, Md. Bayazid Hossain","doi":"10.3329/dujbs.v32i1.64196","DOIUrl":"https://doi.org/10.3329/dujbs.v32i1.64196","url":null,"abstract":"A field experiment was carried out to investigate the effects of vermicompost (0, 10, and 15 tha-1), climatic elements i.e. soil moisture (50%, 70%, and 100%) and elevation of soil temperature (1 to 20C) on the physico-chemical properties and nutrient availability of post-harvest calcareous-acid mixed soils after rice production. A total of 18 treatments assembling the afore-mentioned doses was applied. The analyses of the soils demonstrated significant variation in effects (p ≤0.05) of the treatments on both the available nutrient status and the physicochemical properties of soils. Except for available sulfur; soil pH, EC, organic carbon (OC), available nitrogen, phosphorous, potassium, calcium, and sodium were detected in the higher amounts in 1:1 (calcareous : acid-soils) mixed soils than those of 1:3 mixed counterpart both in initial and post-harvest soil conditions. The highest levels of soil pH, OC, available P and Zn were determined in the treatment T13. Whereas, treatment T6 proved to be the best dose for the highest availability of Ca and Mg. The treatments T1, T2, T11, and T16 were recorded to have the lower OC, available N, P, Ca, Mg, Zn and S contents in soils. In particular, the availability of Na was found to be in lesser amounts in all the subplots. In a nutshell, most of the treatments exerted favourable influence in maintaining a healthy level of soil physico-chemical parameters owing to their inherent characteristics.\u0000Dhaka Univ. J. Biol. Sci. 32(1): 119-134, 2023 (January)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"217 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74893743","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}
Pub Date : 2023-02-19DOI: 10.3329/dujbs.v32i1.64192
MA Hassan Talukder, Shawn Mazumdar, M. Rahman
Soil fertility is one of the most promising factors that directly impact sustainable crop production. Therefore, a pot experiment was conducted in net house on capsicum (Capsicum annuum L.) in the agricultural soil to study the effects of vermicompost (VC) and inorganic fertilizers (NPK) on growth, yield and nutrient content in capsicum plants. The growth parameters and nutritional values were observed during the experiment under eleven treatments. The treatments variables are T1 (control, -VC & -NPK), T2 (VC 5 ton/ha), T3 (VC 10 ton/ha), T4 (VC 15 ton/ha), T5 (N60P35K60 kg/ha), T6 (VC 5 ton/ha +N48P28K48 kg/ha), T7 (VC 10 ton/ha + N48P28K48 kg/ha), T8 (VC 15 ton/ha + N48P28K48 kg/ha), T9 (VC 5 ton/ha + N36P21K36 kg/ ha), T10 (VC 10 ton/ha + N36P21K36 kg/ha), T11 (VC 15 ton/ha + N36P21K36 kg/ha) which were arranged in a completely randomized design (CRD) with three replications. There were statistically significant differences in each treatment for growth and yield parameters. The highest plant height (45 cm), the highest number of leaves (44 no/plant), and the highest leaf area index (90 cm2) were found in the treatments T6, T5 and T9 respectively. The lowest values for all of the above parameters were found in the treatment T1 (control). Then the highest yield parameters fruit no/ plant (3), total fresh weight (39.60 g/plant), and total dry weight (2.38 g/plant) were observed under the treatment T11. The results of the growth and yield parameters varied significantly (p<0.05). The concentrations of total N, P, K and S in different parts were measured and varied significantly (p<0.05) in leaf, stem, root and seeds. Analysis of post-harvest soil also revealed that every physico-chemical property and nutritional value were changed significantly due to different treatments. Dhaka Univ. J. Biol. Sci. 32(1): 73-81, 2023 (January)
{"title":"Accumulation of nitrogen, phosphorus, potassium and sulfur in capsicum (Capsicum annuum L.) as influenced by vermicompost and NPK fertilizers","authors":"MA Hassan Talukder, Shawn Mazumdar, M. Rahman","doi":"10.3329/dujbs.v32i1.64192","DOIUrl":"https://doi.org/10.3329/dujbs.v32i1.64192","url":null,"abstract":"Soil fertility is one of the most promising factors that directly impact sustainable crop production. Therefore, a pot experiment was conducted in net house on capsicum (Capsicum annuum L.) in the agricultural soil to study the effects of vermicompost (VC) and inorganic fertilizers (NPK) on growth, yield and nutrient content in capsicum plants. The growth parameters and nutritional values were observed during the experiment under eleven treatments. The treatments variables are T1 (control, -VC & -NPK), T2 (VC 5 ton/ha), T3 (VC 10 ton/ha), T4 (VC 15 ton/ha), T5 (N60P35K60 kg/ha), T6 (VC 5 ton/ha +N48P28K48 kg/ha), T7 (VC 10 ton/ha + N48P28K48 kg/ha), T8 (VC 15 ton/ha + N48P28K48 kg/ha), T9 (VC 5 ton/ha + N36P21K36 kg/ ha), T10 (VC 10 ton/ha + N36P21K36 kg/ha), T11 (VC 15 ton/ha + N36P21K36 kg/ha) which were arranged in a completely randomized design (CRD) with three replications. There were statistically significant differences in each treatment for growth and yield parameters. The highest plant height (45 cm), the highest number of leaves (44 no/plant), and the highest leaf area index (90 cm2) were found in the treatments T6, T5 and T9 respectively. The lowest values for all of the above parameters were found in the treatment T1 (control). Then the highest yield parameters fruit no/ plant (3), total fresh weight (39.60 g/plant), and total dry weight (2.38 g/plant) were observed under the treatment T11. The results of the growth and yield parameters varied significantly (p<0.05). The concentrations of total N, P, K and S in different parts were measured and varied significantly (p<0.05) in leaf, stem, root and seeds. Analysis of post-harvest soil also revealed that every physico-chemical property and nutritional value were changed significantly due to different treatments.\u0000Dhaka Univ. J. Biol. Sci. 32(1): 73-81, 2023 (January)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"463 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83004539","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}
Pub Date : 2023-02-19DOI: 10.3329/dujbs.v32i1.64193
Md. Alauddin, Mk Rahman, Ahmz Ali
A field experiment was conducted at the research farm of Charfasson Govt. College, Bhola, Bangladesh in rabi season in 2015-2016 to evaluate the effect of cow dung and chemical fertilizers on growth and yield of sunflower cv. BARI-2 (Keroni-2). Highest plant height (208.4 cm), leaf area (410.5 cm2) and leaf area index (12.75) were recorded in T16 (7.5 ton CD ha-1 +N120P90K150kg ha-1). Highest dry matter yield viz. stem (60.67g plant-1) found in treatment T16 (7.5 ton CD ha- 1+N120 P90K150kg ha-1). Maximum dry weight of leaf (25.33g plant-1) and dry weight of root (12.83g plant-1) were found in treatment T15 (7.5 ton CD ha-1 +N80P60K100kg ha-1). Highest dry weight of seed (64.7 g plant-1) and dry wt. of 100 seed (9.8 g) were found in treatment T15 (7.5 ton CD ha-1 +N80P60K100kg ha-1) but the highest number of seed (735.7plant-1) and florescence diameter (52.67 cm) were observed in treatment T13 (5 ton CD ha-1 +N120P90K150kg ha-1). Maximum total dry matter yield per plant was 92.01 g and per hectare was 5.75 ton in T16 (7.5 ton CD ha-1+N120P90K150kg ha-1). Results revealed that the combined application of cow dung and NPK fertilizers produced better growth and yield of sunflower in field condition at the coastal belt of Bangladesh. Dhaka Univ. J. Biol. Sci. 32(1): 83-90, 2023 (January)
{"title":"Growth and yield performance of sunflower (Helianthus annuus L.) as influenced by cow dung and NPK fertilizers","authors":"Md. Alauddin, Mk Rahman, Ahmz Ali","doi":"10.3329/dujbs.v32i1.64193","DOIUrl":"https://doi.org/10.3329/dujbs.v32i1.64193","url":null,"abstract":"A field experiment was conducted at the research farm of Charfasson Govt. College, Bhola, Bangladesh in rabi season in 2015-2016 to evaluate the effect of cow dung and chemical fertilizers on growth and yield of sunflower cv. BARI-2 (Keroni-2). Highest plant height (208.4 cm), leaf area (410.5 cm2) and leaf area index (12.75) were recorded in T16 (7.5 ton CD ha-1 +N120P90K150kg ha-1). Highest dry matter yield viz. stem (60.67g plant-1) found in treatment T16 (7.5 ton CD ha- 1+N120 P90K150kg ha-1). Maximum dry weight of leaf (25.33g plant-1) and dry weight of root (12.83g plant-1) were found in treatment T15 (7.5 ton CD ha-1 +N80P60K100kg ha-1). Highest dry weight of seed (64.7 g plant-1) and dry wt. of 100 seed (9.8 g) were found in treatment T15 (7.5 ton CD ha-1 +N80P60K100kg ha-1) but the highest number of seed (735.7plant-1) and florescence diameter (52.67 cm) were observed in treatment T13 (5 ton CD ha-1 +N120P90K150kg ha-1). Maximum total dry matter yield per plant was 92.01 g and per hectare was 5.75 ton in T16 (7.5 ton CD ha-1+N120P90K150kg ha-1). Results revealed that the combined application of cow dung and NPK fertilizers produced better growth and yield of sunflower in field condition at the coastal belt of Bangladesh.\u0000Dhaka Univ. J. Biol. Sci. 32(1): 83-90, 2023 (January)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76251891","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}
Pub Date : 2023-02-19DOI: 10.3329/dujbs.v32i1.64195
M. H. Khan
The magnitudes of basic slag (BS) at 0, 10, 20 and 30 t ha-1 on iron dynamics in two acid sulfate soils (ASSs) under moisture at field capacity, saturated condition and wetting-drying cycle were studied during 30 months of incubation (25-30 0C). The impacts of BS in Sarisabari ASS were almost similar as those obtained in Purbapukuria ASS under various treatments, but the increments of pHs in Sarisabari ASS were not as pronounced as those observed in Purbapukuria ASS. The pH values were increased by about 1.0, 1.5 and 1.2 units in Sarisabari and 2.0, 1.7 and 1.5 in Purbapukuria ASSs, those received BS30 at field capacity, saturated condition and wetting-drying cycle, respectively and followed by BS20 > BS10 treatments. The contents of basic cations in the studiedASSswere low to medium, while acidic cations were very high in relation to the amounts found in the ASSs elsewhere. Magnesium contents were about 2 to 3 -folds than those of Ca but Fe contents were very high. The application of basic slag in the ASSs was found to reduce the acidity problems noticeably and decreased the Fe contents remarkably. Neutralization of acidity by BS30 at saturation moisture level was determined to be the best for both the ASSs followed by moisture at field capacity and wetting-drying cycle. The soil pH was found to have strong positive relationship with time, while the Fe contents showed strong negative relationship with the corresponding pHs of the ASSs. These indicate that the amelioration of ASSs by the application of BS is a sustainable reclamation and improvement measures regarding Fe toxicity of the soils. Dhaka Univ. J. Biol. Sci. 32(1): 107-118 2023 (January)
研究了碱渣(BS)在0、10、20和30 t hm -1条件下，在田间水分、饱和条件和干湿循环条件下，对两种酸性硫酸盐土壤(ASSs)铁动态的影响。在不同处理下，沙蚕的pH值增幅与紫花楸相似，但均不如紫花楸显著。田间容量、饱和条件和干湿循环处理下，沙蚕的pH值分别增加了1.0、1.5和1.2个单位，沙蚕的pH值增加了2.0、1.7和1.5个单位，其次是BS20 > BS10处理。所研究的ASSs中碱性阳离子的含量为低至中等，而酸性阳离子的含量与其他ASSs中的含量相比非常高。镁的含量是钙的2 ~ 3倍，铁的含量很高。结果表明，碱渣在ASSs中的应用显著降低了酸性问题，并显著降低了铁含量。BS30在饱和水分水平下对酸性的中和效果最好，其次是田间容量水分和干湿循环。土壤pH值与时间呈较强的正相关，而铁含量与ASSs相应的pH值呈较强的负相关。这表明，利用BS改良ASSs是一种针对土壤铁毒性的可持续开垦和改善措施。达卡大学。科学通报32(1):107-118 2023 (1)
{"title":"Magnitudes of basic slag on iron dynamics in Two acid sulfate soils during 30-months of incubation under various moisture regimes","authors":"M. H. Khan","doi":"10.3329/dujbs.v32i1.64195","DOIUrl":"https://doi.org/10.3329/dujbs.v32i1.64195","url":null,"abstract":"The magnitudes of basic slag (BS) at 0, 10, 20 and 30 t ha-1 on iron dynamics in two acid sulfate soils (ASSs) under moisture at field capacity, saturated condition and wetting-drying cycle were studied during 30 months of incubation (25-30 0C). The impacts of BS in Sarisabari ASS were almost similar as those obtained in Purbapukuria ASS under various treatments, but the increments of pHs in Sarisabari ASS were not as pronounced as those observed in Purbapukuria ASS. The pH values were increased by about 1.0, 1.5 and 1.2 units in Sarisabari and 2.0, 1.7 and 1.5 in Purbapukuria ASSs, those received BS30 at field capacity, saturated condition and wetting-drying cycle, respectively and followed by BS20 > BS10 treatments. The contents of basic cations in the studiedASSswere low to medium, while acidic cations were very high in relation to the amounts found in the ASSs elsewhere. Magnesium contents were about 2 to 3 -folds than those of Ca but Fe contents were very high. The application of basic slag in the ASSs was found to reduce the acidity problems noticeably and decreased the Fe contents remarkably. Neutralization of acidity by BS30 at saturation moisture level was determined to be the best for both the ASSs followed by moisture at field capacity and wetting-drying cycle. The soil pH was found to have strong positive relationship with time, while the Fe contents showed strong negative relationship with the corresponding pHs of the ASSs. These indicate that the amelioration of ASSs by the application of BS is a sustainable reclamation and improvement measures regarding Fe toxicity of the soils.\u0000Dhaka Univ. J. Biol. Sci. 32(1): 107-118 2023 (January)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80318832","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}
Pub Date : 2023-02-02DOI: 10.3329/dujbs.v31i2.60886
F. T. Johora, S. Hosen, S. Shamsi
Chrysanthemum morifolium is one of the most famous cut flowers with a high ornamental value, occupying an irreplaceable position in international flower commerce. But most frequently occurred fungal diseases limit the production of this ornamental plant. A total of five fungicides viz., CM-75 WP, Dithane M 45, Ridomil Gold MZ 68 WG, Rovral 50 WP and Score 250 EC were selected to evaluate in vitro efficacy at 100, 200, 300, 400 and 500 ppm concentrations against two pathogenic fungi of Chrysanthemum morifolium namely, Curvularia lunata and Fusarium moniliforme. Rovral 50 WP showed complete growth inhibition of C. lunata and CM 75 WP showed complete growth inhibition of F. moniliforme at all concentrations used. Five plant extracts viz., Azadirachta indica, Citrus limon, Datura metel, Psidium guajava and Vitex negundo were selected to evaluate in vitro efficacy at 5, 10, 15 and 20% concentrations against the test pathogens. Out of the five plant extracts, A. indica showed complete growth inhibition of C. lunata at 15 and 20% concentrations. On the other hand, P. guajava showed complete growth inhibition of F. moniliforme at 20% concentrations. Dhaka Univ. J. Biol. Sci. 31(2): 281-288, 2022 (July)
{"title":"In Vitro Screening of Fungicides And Plant Extracts Against Two Pathogenic Fungi of Chrysanthemum Morifolium Ramat","authors":"F. T. Johora, S. Hosen, S. Shamsi","doi":"10.3329/dujbs.v31i2.60886","DOIUrl":"https://doi.org/10.3329/dujbs.v31i2.60886","url":null,"abstract":"Chrysanthemum morifolium is one of the most famous cut flowers with a high ornamental value, occupying an irreplaceable position in international flower commerce. But most frequently occurred fungal diseases limit the production of this ornamental plant. A total of five fungicides viz., CM-75 WP, Dithane M 45, Ridomil Gold MZ 68 WG, Rovral 50 WP and Score 250 EC were selected to evaluate in vitro efficacy at 100, 200, 300, 400 and 500 ppm concentrations against two pathogenic fungi of Chrysanthemum morifolium namely, Curvularia lunata and Fusarium moniliforme. Rovral 50 WP showed complete growth inhibition of C. lunata and CM 75 WP showed complete growth inhibition of F. moniliforme at all concentrations used. Five plant extracts viz., Azadirachta indica, Citrus limon, Datura metel, Psidium guajava and Vitex negundo were selected to evaluate in vitro efficacy at 5, 10, 15 and 20% concentrations against the test pathogens. Out of the five plant extracts, A. indica showed complete growth inhibition of C. lunata at 15 and 20% concentrations. On the other hand, P. guajava showed complete growth inhibition of F. moniliforme at 20% concentrations.\u0000Dhaka Univ. J. Biol. Sci. 31(2): 281-288, 2022 (July)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79020995","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}
Pub Date : 2023-02-02DOI: 10.3329/dujbs.v31i2.60893
Swagata Sen, M. Saha
The present work aimed to evaluate the bacteria associated with the most popular leafy salad vegetables like Coriander, Mint, and Lettuce and their antibiotic resistance pattern. Samples were collected from Rayshaheb Bazar, Nazira Bazar, and Shyam Bazar during June-August 2019. The maximum bacterial load was found in Coriander and the minimum bacterial load was in Mint. A total of 149 colonies were isolated and 35 isolates were selected for Culture and Sensitivity test against 15 common antibiotics like Amoxicillin (Ax), Cefixime (CFM), Levofloxacin (Lev), Clarithromycin (CLR), Ceftriaxone (CRO), Neomycin (N), Kanamycin (K), Ciprofloxacin (Cip), Erythromycin (E), Doxycycline (Do), Vancomycin (VA), Cefuroxime (CXM), Chloramphenicol (C), Rifampicin (RA), and Gentamycin (CN). Sixteen antibiotic resistant bacterial isolates were selected for their identification and drug resistance pattern. Among these 15 antibiotic resistant bacterial isolates, only 2 were Gram positive and were identified as Enterococcus faecalis and the Gram negative bacteria belonged to the genus Enterobacter (9), Serratia (3), Klebsiella (2).The drug resistance pattern showed that most of the isolated bacteria were resistant against Amoxicillin and susceptible to Chloramphenicol. The (multiple antibiotic resistance (MAR) inedx of the isolated bacteria ranged between 33.33% and 86.67% which is very alarming. Dhaka Univ. J. Biol. Sci. 31(2): 361-369, 2022 (July)
{"title":"Bacteria Associated With the Leafy Salad Vegetables Of Old Dhaka City and Their Multiple Antibiotic Resistance (Mar) Index","authors":"Swagata Sen, M. Saha","doi":"10.3329/dujbs.v31i2.60893","DOIUrl":"https://doi.org/10.3329/dujbs.v31i2.60893","url":null,"abstract":"The present work aimed to evaluate the bacteria associated with the most popular leafy salad vegetables like Coriander, Mint, and Lettuce and their antibiotic resistance pattern. Samples were collected from Rayshaheb Bazar, Nazira Bazar, and Shyam Bazar during June-August 2019. The maximum bacterial load was found in Coriander and the minimum bacterial load was in Mint. A total of 149 colonies were isolated and 35 isolates were selected for Culture and Sensitivity test against 15 common antibiotics like Amoxicillin (Ax), Cefixime (CFM), Levofloxacin (Lev), Clarithromycin (CLR), Ceftriaxone (CRO), Neomycin (N), Kanamycin (K), Ciprofloxacin (Cip), Erythromycin (E), Doxycycline (Do), Vancomycin (VA), Cefuroxime (CXM), Chloramphenicol (C), Rifampicin (RA), and Gentamycin (CN). Sixteen antibiotic resistant bacterial isolates were selected for their identification and drug resistance pattern. Among these 15 antibiotic resistant bacterial isolates, only 2 were Gram positive and were identified as Enterococcus faecalis and the Gram negative bacteria belonged to the genus Enterobacter (9), Serratia (3), Klebsiella (2).The drug resistance pattern showed that most of the isolated bacteria were resistant against Amoxicillin and susceptible to Chloramphenicol. The (multiple antibiotic resistance (MAR) inedx of the isolated bacteria ranged between 33.33% and 86.67% which is very alarming.\u0000Dhaka Univ. J. Biol. Sci. 31(2): 361-369, 2022 (July) ","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78823469","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}
Pub Date : 2023-02-02DOI: 10.3329/dujbs.v31i2.60889
M. K. Uddin, Jakia Rahman, Tazbina Zaman, Khadiza Ahsan
A serious departure from the norm in taking classes has been a regular phenomenon in the University of Dhaka in recent years. The present study aimed to investigate perceptions, reactions, and grievances of students towards class cancellation, class rescheduling, inadequate classes, and classes for less than duration at the University of Dhaka. Data were collected online from 522 students (51.5% male and 48.5% female, mean age = 21.74 years) of the university using a mixed-method design. The quantitative data were analyzed by t-test, Chi-square test, and Pearson product-moment correlation coefficients in SPSS version 24. The results of the t-test demonstrated no significant gender differences in perception towards the main variables. The Chi-square test reveals that the frequencies of occurrences of these phenomena significantly differ among the faculties of four hierarchical positions. The content analysis of the qualitative data revealed 12 major themes namely the four factors across academic units, the favorable impact of these phenomena, increased absenteeism, the sources of stress, anxiety, and frustration, lack of priority, teachers’ disinterest in teaching and learning, a sense of punctuality and responsibility, mutual understanding, timetable of the rescheduled classes, teacher’s accountability and students’ feedback, introducing training for teachers, and the role of authority. The findings of the study suggest a clear lack of administrative control over the teaching behavior of the faculties. The study recommends that the university authority should immediately address these issues to redress the grievances of the students and thereby ensure a quality culture in teaching, learning and research. Dhaka Univ. J. Biol. Sci. 31(2): 309-319, 2022 (July)
近年来，在达卡大学(University of Dhaka)，上课严重偏离常规的现象屡见不鲜。本研究旨在调查达卡大学学生对取消课程、重新安排课程、课程不足和课程时间过短的看法、反应和不满。采用混合方法设计在线收集该大学522名学生的数据，其中男性51.5%，女性48.5%，平均年龄21.74岁。定量资料采用SPSS version 24中的t检验、卡方检验和Pearson积差相关系数进行分析。t检验的结果表明，对主要变量的感知没有显著的性别差异。卡方检验表明，这些现象的发生频率在四个等级职位的院系之间有显著差异。定性数据的内容分析揭示了12个主要主题，即跨学科单元的四个因素，这些现象的有利影响，缺勤增加，压力，焦虑和挫折的来源，缺乏优先考虑，教师对教学和学习不感兴趣，守时和责任感，相互理解，重新安排课程的时间表，教师的责任和学生的反馈，对教师进行培训，以及权威的作用。这项研究的结果表明，对教师的教学行为明显缺乏行政控制。研究建议大学当局应立即处理这些问题，以纠正学生的不满，从而确保优质的教、学和研究文化。达卡大学。科学31(2):309- 319,2022 (7)
{"title":"Reactions of Students Towards Class Cancellation, Class Rescheduling, Inadequate Classes and Classes for Less Than Designated Duration in Dhaka University","authors":"M. K. Uddin, Jakia Rahman, Tazbina Zaman, Khadiza Ahsan","doi":"10.3329/dujbs.v31i2.60889","DOIUrl":"https://doi.org/10.3329/dujbs.v31i2.60889","url":null,"abstract":"A serious departure from the norm in taking classes has been a regular phenomenon in the University of Dhaka in recent years. The present study aimed to investigate perceptions, reactions, and grievances of students towards class cancellation, class rescheduling, inadequate classes, and classes for less than duration at the University of Dhaka. Data were collected online from 522 students (51.5% male and 48.5% female, mean age = 21.74 years) of the university using a mixed-method design. The quantitative data were analyzed by t-test, Chi-square test, and Pearson product-moment correlation coefficients in SPSS version 24. The results of the t-test demonstrated no significant gender differences in perception towards the main variables. The Chi-square test reveals that the frequencies of occurrences of these phenomena significantly differ among the faculties of four hierarchical positions. The content analysis of the qualitative data revealed 12 major themes namely the four factors across academic units, the favorable impact of these phenomena, increased absenteeism, the sources of stress, anxiety, and frustration, lack of priority, teachers’ disinterest in teaching and learning, a sense of punctuality and responsibility, mutual understanding, timetable of the rescheduled classes, teacher’s accountability and students’ feedback, introducing training for teachers, and the role of authority. The findings of the study suggest a clear lack of administrative control over the teaching behavior of the faculties. The study recommends that the university authority should immediately address these issues to redress the grievances of the students and thereby ensure a quality culture in teaching, learning and research.\u0000Dhaka Univ. J. Biol. Sci. 31(2): 309-319, 2022 (July)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90252513","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}
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