Pub Date : 2023-02-02DOI: 10.3329/dujbs.v31i2.60885
A. Kaium, S. Hosen, S. Shamsi
An investigation was carried out to study lichen flora of National Botanical Garden, Dhaka, during the tenure of May 2018 to April 2019. Seven genera of lichens namely Chrysothrix, Cladonia, Cryptothecia, Herpothallon, Parmelia, Pertusaria and Usnea were recorded from 15 blocks of the Garden. Lichens were abundantly grown and their number increased from June to October, whereas from November to April the number of lichens gradually decreased. The maximum frequency percentage (36.52) of the association found in Parmelia while minimum frequency percentage was recorded 2.48 in Usnea. Among three different heights, the highest number of lichens was recorded within 2 to 4 feet. Most exclusively, Parmelia was found in all the studied blocks, whereas other identified lichens were observed randomly. The present investigation will be helpful to enrich the knowledge on lichen biota of Bangladesh. Dhaka Univ. J. Biol. Sci. 31(2): 273-280, 2022 (July)
{"title":"Frequency, Abundance and Distribution of Lichen In National Botanical Garden, Mirpur, Dhaka, Bangladesh","authors":"A. Kaium, S. Hosen, S. Shamsi","doi":"10.3329/dujbs.v31i2.60885","DOIUrl":"https://doi.org/10.3329/dujbs.v31i2.60885","url":null,"abstract":"An investigation was carried out to study lichen flora of National Botanical Garden, Dhaka, during the tenure of May 2018 to April 2019. Seven genera of lichens namely Chrysothrix, Cladonia, Cryptothecia, Herpothallon, Parmelia, Pertusaria and Usnea were recorded from 15 blocks of the Garden. Lichens were abundantly grown and their number increased from June to October, whereas from November to April the number of lichens gradually decreased. The maximum frequency percentage (36.52) of the association found in Parmelia while minimum frequency percentage was recorded 2.48 in Usnea. Among three different heights, the highest number of lichens was recorded within 2 to 4 feet. Most exclusively, Parmelia was found in all the studied blocks, whereas other identified lichens were observed randomly. The present investigation will be helpful to enrich the knowledge on lichen biota of Bangladesh.\u0000Dhaka Univ. J. Biol. Sci. 31(2): 273-280, 2022 (July)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86755692","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.v31i2.60879
M. Billah, Raj Kumar Halder, Fatima Tuzzohura, Oviuzzaman Nibir, SK Rafia Islam, Mk Rahman
Influence of organic manures (10 ton ha-1), nitrogen (50 and 100 kg ha-1), phosphorus (10 and 20 kg ha-1) and potassium (30 and 60 kg ha-1) on the growth and yield of Aloe vera (L.) Burm.f. (Aloe barbadensis Mill.) were evaluated. Experiment was conducted in a randomized design replicated thrice with eleven treatments with NPK and without NPK fertilizers. Highest length of leaf (18 cm), highest leaf area (23.40 cm2plant-1), highest leaf area index 0.06 were observed in ACI10ton ha-1plus N50P10K3O kg ha-1 treatment, highest fresh weight (78.23gplant-1) and highest dry weight (9.58 gplant-1) of plant biomass were observed in GTS 10ton ha-1 treatment. Highest concentration of N (2.69%) and protein content (16.84 %) in the leaf were recorded in GTS10 ton ha-1 treatment. Results revealed that the best growth performance and yield, and protein content in the leaf of Aloe vera was observed in GTS10 ton ha-1 treatment. Dhaka Univ. J. Biol. Sci. 31(2): 203-212, 2022 (July)
有机肥(10 t hm -1)、氮(50和100 kg hm -1)、磷(10和20 kg hm -1)和钾(30和60 kg hm -1)对芦荟生长和产量的影响Burm.f。(Aloe barbadensis Mill.)进行评价。试验采用随机设计，共11个氮磷钾处理和不施用氮磷钾处理，重复3次。ac10t ha-1 + n50p10k30 kg ha-1处理植株叶长最高(18 cm)，叶面积最高(23.40 cm2)，叶面积指数最高(0.06)，GTS 10t ha-1处理植株鲜重最高(78.23gplant-1)，干重最高(9.58 gplant-1)。GTS10 t hm -1处理的叶片氮含量和蛋白质含量最高，分别为2.69%和16.84%。结果表明，GTS10 t ha-1处理芦荟的生长性能、产量和叶片蛋白质含量最高。达卡大学。科学31(2):203- 212,2022 (7)
{"title":"Growth and Yield of Aloe Vera (L.) Burm.f. As Influenced By Organic Manures and Chemical Fertilizers","authors":"M. Billah, Raj Kumar Halder, Fatima Tuzzohura, Oviuzzaman Nibir, SK Rafia Islam, Mk Rahman","doi":"10.3329/dujbs.v31i2.60879","DOIUrl":"https://doi.org/10.3329/dujbs.v31i2.60879","url":null,"abstract":"Influence of organic manures (10 ton ha-1), nitrogen (50 and 100 kg ha-1), phosphorus (10 and 20 kg ha-1) and potassium (30 and 60 kg ha-1) on the growth and yield of Aloe vera (L.) Burm.f. (Aloe barbadensis Mill.) were evaluated. Experiment was conducted in a randomized design replicated thrice with eleven treatments with NPK and without NPK fertilizers. Highest length of leaf (18 cm), highest leaf area (23.40 cm2plant-1), highest leaf area index 0.06 were observed in ACI10ton ha-1plus N50P10K3O kg ha-1 treatment, highest fresh weight (78.23gplant-1) and highest dry weight (9.58 gplant-1) of plant biomass were observed in GTS 10ton ha-1 treatment. Highest concentration of N (2.69%) and protein content (16.84 %) in the leaf were recorded in GTS10 ton ha-1 treatment. Results revealed that the best growth performance and yield, and protein content in the leaf of Aloe vera was observed in GTS10 ton ha-1 treatment.\u0000Dhaka Univ. J. Biol. Sci. 31(2): 203-212, 2022 (July)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"89 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81453296","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.v31i2.60887
M. Islam, Makidul Islam Khan, Aparna Barman, Most. Nilufa Yeasmin
Out of six hilsa sanctuaries in Bangladesh, the newly established Hizla- Mehendiganj sanctuary is significantly lacking in data in terms of fish diversity and physicochemical properties. Therefore, the present study aims to assess water quality variables and fish biodiversity of the Hizla-Mehendiganj hilsa sanctuary. Water and fish samples were collected from different sites within and outside the sanctuary. Physicochemical variables such as dissolved oxygen (DO), temperature, pH, electrical conductivity (EC), total dissolved solids (TDS) and transparency were measured and fish biodiversity was estimated using different richness and evenness indices. The mean DO, temperature, pH and transparency inside the sanctuary were 5.6 ± 0.1 mg/l, 29.1 ± 0.7°C, 8.3 ± 0.05 and 20.5 ± 2.3 cm, respectively which were nearly similar to the estimated values of those variables of the outside sanctuary. This study found a total of 374 individuals of 21 fish species under 6 orders and 14 families. According to the IUCN report 2015, this study found that 76.19, 9.52 and 4.76% of these species are listed in the Least Concern, Endangered and Vulnerable category, respectively. Within the sanctuary, 76 individuals of 13 fish species under 4 orders were recorded which was lower than the recorded number of total individuals and number of species outside the sanctuary sites. Within the sanctuary, estimated Shannon’s, Simpson’s, Margalef’s and Buzas and Gibson’s indices were 1.881, 0.214, 1.881 and 1.156, respectively which indicated comparatively moderate diversity. The highest biodiversity was found in the Ilisha river near Rukundi, outside the sampling site of the sanctuary. The findings of this study can be used for future biodiversity assessments, conservation and impact assessments of the Hizla- Mehendiganj hilsa sanctuary. Dhaka Univ. J. Biol. Sci. 31(2): 289-301, 2022 (July)
{"title":"Physicochemical Variables And Fish Diversity In Hizlamehendiganj Hilsa Sanctuary In Bangladesh","authors":"M. Islam, Makidul Islam Khan, Aparna Barman, Most. Nilufa Yeasmin","doi":"10.3329/dujbs.v31i2.60887","DOIUrl":"https://doi.org/10.3329/dujbs.v31i2.60887","url":null,"abstract":"Out of six hilsa sanctuaries in Bangladesh, the newly established Hizla- Mehendiganj sanctuary is significantly lacking in data in terms of fish diversity and physicochemical properties. Therefore, the present study aims to assess water quality variables and fish biodiversity of the Hizla-Mehendiganj hilsa sanctuary. Water and fish samples were collected from different sites within and outside the sanctuary. Physicochemical variables such as dissolved oxygen (DO), temperature, pH, electrical conductivity (EC), total dissolved solids (TDS) and transparency were measured and fish biodiversity was estimated using different richness and evenness indices. The mean DO, temperature, pH and transparency inside the sanctuary were 5.6 ± 0.1 mg/l, 29.1 ± 0.7°C, 8.3 ± 0.05 and 20.5 ± 2.3 cm, respectively which were nearly similar to the estimated values of those variables of the outside sanctuary. This study found a total of 374 individuals of 21 fish species under 6 orders and 14 families. According to the IUCN report 2015, this study found that 76.19, 9.52 and 4.76% of these species are listed in the Least Concern, Endangered and Vulnerable category, respectively. Within the sanctuary, 76 individuals of 13 fish species under 4 orders were recorded which was lower than the recorded number of total individuals and number of species outside the sanctuary sites. Within the sanctuary, estimated Shannon’s, Simpson’s, Margalef’s and Buzas and Gibson’s indices were 1.881, 0.214, 1.881 and 1.156, respectively which indicated comparatively moderate diversity. The highest biodiversity was found in the Ilisha river near Rukundi, outside the sampling site of the sanctuary. The findings of this study can be used for future biodiversity assessments, conservation and impact assessments of the Hizla- Mehendiganj hilsa sanctuary.\u0000Dhaka Univ. J. Biol. Sci. 31(2): 289-301, 2022 (July)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"163 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86198371","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.v31i2.60881
I. Shahnaz, Sanjida Kabir
The present experiment investigated whether different reading methods would have any effect on reading comprehension performance. It was hypothesized that reading comprehensive performance would be better with subvocalization than other reading methods. The independent variable was reading methods and the dependent variable was performance (speed and accuracy). To conduct this experiment, 60 school students were taken with age ranges from 8 to 10 years. The Latin Square design was used to conduct this experiment. Recall scores were obtained for each participant in terms of four reading methods: silent reading, subvocalization, reading aloud and listening music while reading. Results of the One-way ANOVA and Post Hoc test showed that only reading time vary among four reading methods. Multiple comparisons showed that there is a significant difference in reading time between silent reading and reading aloud. So, the result did not support the hypothesis of subvocalization as a better reading method. Dhaka Univ. J. Biol. Sci. 31(2): 225-230, 2022 (July)
{"title":"Examining Comparative Effect of Reading Methods On Reading Comprehension","authors":"I. Shahnaz, Sanjida Kabir","doi":"10.3329/dujbs.v31i2.60881","DOIUrl":"https://doi.org/10.3329/dujbs.v31i2.60881","url":null,"abstract":"The present experiment investigated whether different reading methods would have any effect on reading comprehension performance. It was hypothesized that reading comprehensive performance would be better with subvocalization than other reading methods. The independent variable was reading methods and the dependent variable was performance (speed and accuracy). To conduct this experiment, 60 school students were taken with age ranges from 8 to 10 years. The Latin Square design was used to conduct this experiment. Recall scores were obtained for each participant in terms of four reading methods: silent reading, subvocalization, reading aloud and listening music while reading. Results of the One-way ANOVA and Post Hoc test showed that only reading time vary among four reading methods. Multiple comparisons showed that there is a significant difference in reading time between silent reading and reading aloud. So, the result did not support the hypothesis of subvocalization as a better reading method.\u0000Dhaka Univ. J. Biol. Sci. 31(2): 225-230, 2022 (July)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81034050","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.v31i2.60888
Aminul Islam, Muhammad Kamal Uddin
The problem of the present study was to investigate whether there is any effect of contextual cues on learning. Literature review indicated a lack of a reliable previous answer to the problem. The purpose of the study was to test whether any connection is created for contextual cues in the brain. It was hypothesized that each contextual cue creates a distinguished connection in the brain. If contextual cues remain identical throughout both practice and revision sessions, learning will enhance. Purposively drawing 36 students from class V, we randomly assigned them under two conditions, namely control and experimental groups. The results showed that the mean scores of control and experimental groups were 9.56 and 14.83 consecutively, which differ significantly at the p < .001 (t = -6.752) level. Since experimental group scored significantly higher than the control group, it was concluded that contextual cues play an important role on learning. Dhaka Univ. J. Biol. Sci. 31(2): 303-307, 2022 (July)
{"title":"Effects of Contextual Cues on Learning","authors":"Aminul Islam, Muhammad Kamal Uddin","doi":"10.3329/dujbs.v31i2.60888","DOIUrl":"https://doi.org/10.3329/dujbs.v31i2.60888","url":null,"abstract":"The problem of the present study was to investigate whether there is any effect of contextual cues on learning. Literature review indicated a lack of a reliable previous answer to the problem. The purpose of the study was to test whether any connection is created for contextual cues in the brain. It was hypothesized that each contextual cue creates a distinguished connection in the brain. If contextual cues remain identical throughout both practice and revision sessions, learning will enhance. Purposively drawing 36 students from class V, we randomly assigned them under two conditions, namely control and experimental groups. The results showed that the mean scores of control and experimental groups were 9.56 and 14.83 consecutively, which differ significantly at the p < .001 (t = -6.752) level. Since experimental group scored significantly higher than the control group, it was concluded that contextual cues play an important role on learning.\u0000Dhaka Univ. J. Biol. Sci. 31(2): 303-307, 2022 (July)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91539981","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.v31i2.60892
A. R. Shome, Md. Fazle Rabbe, M. Alam, Seam Ferdous Emon, Md Mazaharul Islam, Razia Sultana Setu, N. Khan, Dipto Biswas, M. F. Jaman
A yearlong scientific study was conducted using direct field observation technique from November 2020 to October 2021 to investigate community structure, habitat preference, and conservation concerns of birds in the urban setting of Faridpur Sadar Upazila. A total of 168 species under 18 orders and 56 families were recorded and 6,551 individual of birds were counted. The order Passeriformes had the highest species richness (71 species, 42.26%) and abundance (n=3,831, 58.48%). Among the bird species, 48 species (29.58%) were migratory and the rest were resident. During the winter season, the highest number of bird species (156 species, 92.85%) and individuals (n= 2,960, 45.18%) were observed. The overall comparison of species richness and abundance for three seasons were significant. Pair-wise one-way ANOVA for species richness and abundance of birds shows significant differences between winter-rainy and summer-winter seasons.The diversity index showed the highest value in winter season. Analysis of similarity (ANOSIM) test showed a significant difference in birds communities among three-season. Among the 10 types of microhabitats surveyed, trees were the most used by the bird species (103 species, 61.31%) The highest 69 species (41.07%) were very common according to the observation status. The most abundant bird was Pycnonotus cafer with the highest relative abundance (5.15%). Bird hunting, trade, and habitat loss were the major threats for the survival of bird community in this area. Therefore, immediate initiatives are needed to implement for the conservation of bird and their habitats. Dhaka Univ. J. Biol. Sci. 31(2): 343-360, 2022 (July)
{"title":"Avifauna in an Urban Landscape of a Lower Ganges District Of Bangladesh: Community Structure, Seasonality, Habitat Preference and Conservation Issues","authors":"A. R. Shome, Md. Fazle Rabbe, M. Alam, Seam Ferdous Emon, Md Mazaharul Islam, Razia Sultana Setu, N. Khan, Dipto Biswas, M. F. Jaman","doi":"10.3329/dujbs.v31i2.60892","DOIUrl":"https://doi.org/10.3329/dujbs.v31i2.60892","url":null,"abstract":"A yearlong scientific study was conducted using direct field observation technique from November 2020 to October 2021 to investigate community structure, habitat preference, and conservation concerns of birds in the urban setting of Faridpur Sadar Upazila. A total of 168 species under 18 orders and 56 families were recorded and 6,551 individual of birds were counted. The order Passeriformes had the highest species richness (71 species, 42.26%) and abundance (n=3,831, 58.48%). Among the bird species, 48 species (29.58%) were migratory and the rest were resident. During the winter season, the highest number of bird species (156 species, 92.85%) and individuals (n= 2,960, 45.18%) were observed. The overall comparison of species richness and abundance for three seasons were significant. Pair-wise one-way ANOVA for species richness and abundance of birds shows significant differences between winter-rainy and summer-winter seasons.The diversity index showed the highest value in winter season. Analysis of similarity (ANOSIM) test showed a significant difference in birds communities among three-season. Among the 10 types of microhabitats surveyed, trees were the most used by the bird species (103 species, 61.31%) The highest 69 species (41.07%) were very common according to the observation status. The most abundant bird was Pycnonotus cafer with the highest relative abundance (5.15%). Bird hunting, trade, and habitat loss were the major threats for the survival of bird community in this area. Therefore, immediate initiatives are needed to implement for the conservation of bird and their habitats.\u0000Dhaka Univ. J. Biol. Sci. 31(2): 343-360, 2022 (July)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"59 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72599328","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.v31i2.60891
Sadia Bintay Soliaman, Md. Bayazid Hossain, M. Saha, R. Mandal, M. H. Khan
A pot experiment was performed in the net house to observe the influence of cow dung and poultry manure on the growth of red amaranth grown in the amended soil (mixture of acid and calcareous soil). Acid soil was mixed with calcareous soil at a ratio of 3:1 for experiment with red amaranth. The pot experiment was conducted with the mixed soil indicated by T0M (control-where no amendment was added), three different rates of cow dung such as T1 (3 ton/ha), T2 (6 ton/ha) and T3 (9 ton/ha) and three rate of poultry manure designated as T4 (2 ton/ha), T5 (4 ton/ha) and T6 (6 ton/ha). Treatment responses were evaluated in terms of different parameters including uptake of nutrients by plants and post-harvest properties of soil such as physico-chemical properties and residual nutrient content of the soil. It is evident from the experiment that the uptake of the plant nutrients was the best in the mixed soil (T0M-control) than those of the acid (TA) and calcareous soils (TC). On the other hand, T3 (9 ton cow dung/ha) showed the highest uptake of nutrients except for S and Mg among the all treatments. In the post-harvest soil, the maximum nutrient contents increased in the highest doses of cow dung (except for the S, Cu, Mn and Zn) and poultry manure (except for the K, Ca, Mg and Fe) treatments. Results of the study showed that soil amendment (mixture of acid and calcareous soil) can be a suitable reclamation process while the addition of organic manures can also improve soil health. Dhaka Univ. J. Biol. Sci. 31(2): 329-342, 2022 (July)
{"title":"Impacts of Cow Dung and Poultry Manure on the Mineral Nutrient Uptake of Red Amaranth Grown in a Mixture Of Acid and Calcareous Soils","authors":"Sadia Bintay Soliaman, Md. Bayazid Hossain, M. Saha, R. Mandal, M. H. Khan","doi":"10.3329/dujbs.v31i2.60891","DOIUrl":"https://doi.org/10.3329/dujbs.v31i2.60891","url":null,"abstract":"A pot experiment was performed in the net house to observe the influence of cow dung and poultry manure on the growth of red amaranth grown in the amended soil (mixture of acid and calcareous soil). Acid soil was mixed with calcareous soil at a ratio of 3:1 for experiment with red amaranth. The pot experiment was conducted with the mixed soil indicated by T0M (control-where no amendment was added), three different rates of cow dung such as T1 (3 ton/ha), T2 (6 ton/ha) and T3 (9 ton/ha) and three rate of poultry manure designated as T4 (2 ton/ha), T5 (4 ton/ha) and T6 (6 ton/ha). Treatment responses were evaluated in terms of different parameters including uptake of nutrients by plants and post-harvest properties of soil such as physico-chemical properties and residual nutrient content of the soil. It is evident from the experiment that the uptake of the plant nutrients was the best in the mixed soil (T0M-control) than those of the acid (TA) and calcareous soils (TC). On the other hand, T3 (9 ton cow dung/ha) showed the highest uptake of nutrients except for S and Mg among the all treatments. In the post-harvest soil, the maximum nutrient contents increased in the highest doses of cow dung (except for the S, Cu, Mn and Zn) and poultry manure (except for the K, Ca, Mg and Fe) treatments. Results of the study showed that soil amendment (mixture of acid and calcareous soil) can be a suitable reclamation process while the addition of organic manures can also improve soil health.\u0000Dhaka Univ. J. Biol. Sci. 31(2): 329-342, 2022 (July)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"12 3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78334204","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.v31i2.60890
Rahana Yeasmin, M. Saha
The present investigations were carried out to screen the PGPR isolates from five separate seasonal flower beds (Catharanthus roseus, Portulaca grandiflora, Celosia argentea, Gomphrena globosa and Impatiens balsamina) of Curzon Hall, University of Dhaka. The bacterial load of the collected soil samples ranged in between 7.60 ± 6.01 × 106 and 9.49 ± 5.44× 108 cfu/g, 5.34 ± 4.06×106 and 13.4 ± 4.8×106 cfu/g and 1.01 ± 0.59×106 and 1.19 ± 0.95×108 cfu/g on Nutrient Agar (NA), Luria-Bertani (LB) and Yeast Extract Mannitol Agar (YEMA), respectively. All the selected eight isolates were Gram positive and rod shaped. All isolates were found to be IAA producer and 7 showed varying levels of phosphate solubilizing activity. IAA production and phosphate (P) solubilization of the selected isolates ranged in between 9.76 ± 5.98 to 17.99 ± 1.865 U/ml, and 1.17 ± 0.59 to 1.84 ± 0.499 mg/l. Maximum production of both IAA and phosphate solubilization was achieved in 24h of incubation period at 37°C and pH 7.0. Germination test against Mung Bean (Vigna radiata) revealed positive plant growth promoting activities and could be used as PGPR inoculant. Dhaka Univ. J. Biol. Sci. 31(2): 321-328, 2022 (July)
{"title":"Characterization of Plant Growth Promoting Rhizobacteria From Seasonal Flower Beds","authors":"Rahana Yeasmin, M. Saha","doi":"10.3329/dujbs.v31i2.60890","DOIUrl":"https://doi.org/10.3329/dujbs.v31i2.60890","url":null,"abstract":"The present investigations were carried out to screen the PGPR isolates from five separate seasonal flower beds (Catharanthus roseus, Portulaca grandiflora, Celosia argentea, Gomphrena globosa and Impatiens balsamina) of Curzon Hall, University of Dhaka. The bacterial load of the collected soil samples ranged in between 7.60 ± 6.01 × 106 and 9.49 ± 5.44× 108 cfu/g, 5.34 ± 4.06×106 and 13.4 ± 4.8×106 cfu/g and 1.01 ± 0.59×106 and 1.19 ± 0.95×108 cfu/g on Nutrient Agar (NA), Luria-Bertani (LB) and Yeast Extract Mannitol Agar (YEMA), respectively. All the selected eight isolates were Gram positive and rod shaped. All isolates were found to be IAA producer and 7 showed varying levels of phosphate solubilizing activity. IAA production and phosphate (P) solubilization of the selected isolates ranged in between 9.76 ± 5.98 to 17.99 ± 1.865 U/ml, and 1.17 ± 0.59 to 1.84 ± 0.499 mg/l. Maximum production of both IAA and phosphate solubilization was achieved in 24h of incubation period at 37°C and pH 7.0. Germination test against Mung Bean (Vigna radiata) revealed positive plant growth promoting activities and could be used as PGPR inoculant.\u0000Dhaka Univ. J. Biol. Sci. 31(2): 321-328, 2022 (July)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74279474","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.v31i2.60883
Suraiya Islam Munni, Mushfiqul Anwar Siraji, Zinnatul Borak
With the increased aggressive behavior observed among the children and adolescents in Bangladesh, it is pressing to investigate plausible aggression scripts acquired in childhood that may cause aggressive behavior at a later age. Normative Beliefs about Aggression Scale (NOBAGS) is such a popular tool to identify aggression scripts by measuring children’s cognitive dispositions toward aggressive behavior. The current study culturally adapted and psychometrically validated the NOBAGS for elementary school students. After translating all 20 items, it was administered to 210 children (pilot: 30, field study: 180), ages ranging from 10 to 11 years, recruited from two different schools in Dhaka using the convenience sampling method. The Bangla NOBAGS retained all 20 items of the original scale with a latent structure of six correlated components. The Bangla NOBAGS showed satisfactory reliability estimates (Total scale: McDonald’s ωt =.96; subscales McDonald’s ωt: .68-.90) and validity evidence. The psychometric sound properties of the Bangla NOBAGS suggest the plausible use of this scale to assess elementary school children’s perception towards aggressive behavior. Dhaka Univ. J. Biol. Sci. 31(2): 243-255, 2022 (July)
{"title":"Cultural Adaptation and Psychometric Evaluation of The Normative Beliefs About Aggression Scale in Bangla","authors":"Suraiya Islam Munni, Mushfiqul Anwar Siraji, Zinnatul Borak","doi":"10.3329/dujbs.v31i2.60883","DOIUrl":"https://doi.org/10.3329/dujbs.v31i2.60883","url":null,"abstract":"With the increased aggressive behavior observed among the children and adolescents in Bangladesh, it is pressing to investigate plausible aggression scripts acquired in childhood that may cause aggressive behavior at a later age. Normative Beliefs about Aggression Scale (NOBAGS) is such a popular tool to identify aggression scripts by measuring children’s cognitive dispositions toward aggressive behavior. The current study culturally adapted and psychometrically validated the NOBAGS for elementary school students. After translating all 20 items, it was administered to 210 children (pilot: 30, field study: 180), ages ranging from 10 to 11 years, recruited from two different schools in Dhaka using the convenience sampling method. The Bangla NOBAGS retained all 20 items of the original scale with a latent structure of six correlated components. The Bangla NOBAGS showed satisfactory reliability estimates (Total scale: McDonald’s ωt =.96; subscales McDonald’s ωt: .68-.90) and validity evidence. The psychometric sound properties of the Bangla NOBAGS suggest the plausible use of this scale to assess elementary school children’s perception towards aggressive behavior.\u0000Dhaka Univ. J. Biol. Sci. 31(2): 243-255, 2022 (July)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81815139","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.v31i2.60882
Rajeka Fardosh Tany, M. Khanam
The purpose of the present study was to develop a scale to measure overscheduling of the adolescents in Bangladesh. 51 items were initially constructed. This scale was divided into seven sub divisions. Those are the mood (7 items), academic grade (7 items), favorite activities (8 items), sleep (5 items), food habit (9 items), withdrawal behavior (8 items) and physical illness (7 items). These items were arranged in a 4-point Likert type scale for the first try out. It was administered 119 adolescents who are purposively selected. Among them 58 were overweight adolescents (30 boys and 28 girls) and 61 were normal weight adolescents (31 boys and 30 girls). The age range of the participants are 11 to 16 years. To determine the internal consistency item-total correlation and Cronbach’s Alpha was calculated. The Cronbach’s Alpha of total scale was .869 and sub scales were also satisfactory, α =0, 01. Content validity, convergent validity and concurrent validity were calculated and those were also found significant for overscheduled scale for adolescents. The minimum and maximum possible score of this scale was 0 to 144. Higher scores indicate high level of over schedule and lower score indicate less level of over schedule. Dhaka Univ. J. Biol. Sci. 31(2): 231-242, 2022 (July)
{"title":"Development of Over-Scheduled Scale for Adolescents","authors":"Rajeka Fardosh Tany, M. Khanam","doi":"10.3329/dujbs.v31i2.60882","DOIUrl":"https://doi.org/10.3329/dujbs.v31i2.60882","url":null,"abstract":"The purpose of the present study was to develop a scale to measure overscheduling of the adolescents in Bangladesh. 51 items were initially constructed. This scale was divided into seven sub divisions. Those are the mood (7 items), academic grade (7 items), favorite activities (8 items), sleep (5 items), food habit (9 items), withdrawal behavior (8 items) and physical illness (7 items). These items were arranged in a 4-point Likert type scale for the first try out. It was administered 119 adolescents who are purposively selected. Among them 58 were overweight adolescents (30 boys and 28 girls) and 61 were normal weight adolescents (31 boys and 30 girls). The age range of the participants are 11 to 16 years. To determine the internal consistency item-total correlation and Cronbach’s Alpha was calculated. The Cronbach’s Alpha of total scale was .869 and sub scales were also satisfactory, α =0, 01. Content validity, convergent validity and concurrent validity were calculated and those were also found significant for overscheduled scale for adolescents. The minimum and maximum possible score of this scale was 0 to 144. Higher scores indicate high level of over schedule and lower score indicate less level of over schedule.\u0000Dhaka Univ. J. Biol. Sci. 31(2): 231-242, 2022 (July)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"56 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85047875","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：