Jahangirnagar University journal of biological sciences 

About: Jahangirnagar University journal of biological sciences is an academic journal published by Bangladesh Journals Online. The journal publishes majorly in the area(s): Biology & Horticulture. It has an ISSN identifier of 2306-0263. It is also open access. Over the lifetime, 15 publications have been published receiving 1 citations.

Human-wildlife conflict along the edge of the Sundarbans mangrove forest in Satkhira, Bangladesh

Abstract: This paper describes the scenario of human-wildlife conflict along the edge of the Sundarbans mangrove forest in Satkhira, Bangladesh. In and around the Sundarbans mangrove forest human-wildlife conflict occurs in the category of crop and material damage, depredation of domestic animal, human laceration and human death. The animals that were mostly involved in human-wildlife conflict are tiger, crocodile, snake and monitor lizard. Due to humanwildlife conflict, a total of 172 people and 10 tigers died during the period 1990-2018. Among the total claimed human death, 97.6% (n=168) of victims were killed by tiger, 1.7% (n=3) by crocodile and 0.6% (n=1) by snake. On the other hand, among the killed tigers, the higher proportion (80%, n=8) was male and the lower proportion (20%, n=2) was female. Most of the victims (90%) were assaulted by tigers during hours of sunlight, mainly from 10:00 am to 12:00 pm (40%) and 7:00 am to 9:00 am (25%). The generation approaching middle age (age 45-59) were most commonly assaulted (33%), but the attack was also high in 30-44 age class (26%). The attacks on different professional classes comprise honey gatherers (60%), woodcutters (22%) and fishermen (18%). Tiger attacks mostly took place in Gabura (59%, n=98), Koikhali (21%, n=35), Ramjannagar (10%, n=18), Munshiganj (7%, n=11) and others places (3%, n=6). Rested on the evidence of killed (97.6%, n=168) and wounded (78%, n=247) humans by tigers, 60% of the killed people were partially consumed while 30 % were not consumed when the bodies of victims were recovered. Departed bodies were found to have been dragged a distance of 300-800 m inside the deep forest from the initial spot of attack. Human wildlife conflict hampers the animal conservation initiatives in the natural ecosystems and poses the most serious challenges to the persistence and survival of wildlife. Therefore, there is an urgent necessity to develop a conducive environment for all concerned stakeholders to rectify the situation, and to revive their capacities in the most productive and successful way. Jahangirnagar University J. Biol. Sci. 10(1 & 2): 59-70, 2021 (June & December)

Quality assessment of ciprofloxacin tablets - an antimicrobial drug marketed in Bangladesh

Abstract: Ciprofloxacin is a syntheticfluroquinolone derivative. It is prescribed as a potent antibiotic to treat bacterial infections. An attempt was made to assess the quality of six brands of ciprofloxacin tablets marketed in Bangladesh. Various physicochemical tests, viz., weight variation, hardness, friability, disintegration, dissolution and assay for the content of the active ingredient, were performed in accordance with the methods described in the United States Pharmacopoeia 38 (USP 38). UV-Vis spectrophotometric technique was used for dissolution test while High Performance Liquid Chromatography (HPLC) was used to estimate the potency. All the samples passed the physical tests carried out except one sample (code 004), which failed the friability test.Dissolution profile of each brand was satisfactory. All the brands of examined for the content of the active ingredient complied with the limit stipulated in USP 38 for ciprofloxacin except two brands (003 and 004) which showed slightly higher potency of the drug. Jahangirnagar University J. Biol. Sci. 10(1 & 2): 9-17, 2021 (June & December)

Effects of sodium chloride salinity on growth and yield of BARI Sunflower-2 (Helianthus annuus L.)

Abstract: A pot experiment was conducted to assess the effect of seven different NaCl solution treatments, namely 0, 50, 100, 150, 200, 250 and 300 mM on the growth and yield of BARI Sunflower-2 under sodium chloride stress. Growth parameters such as plant height, leaf number, leaf length, leaf width and leaf area showed a gradual decrease from50 mM to the highest treatment level. Sodium chloride stress caused a significant reduction in early stage growth parameters (15 Days after treatments (DAT), while at 45 DAT the percentages of various growth parameters compared to the control plant at the highest treatment level (300mM) except leaf area. Seed yield per plant and weight of 100 seeds were reduced, respectively by 27.69 and 28.44%at 300 mM salinity, while at moderate salinity (200 mM) seed yield per plant and weight of 100 seed were 83.28 and 84.12%, respectively, as compared to in compared to those of the control plants. The results obtained in the present study showed that the BARI Sunflower-2 cultivar is a moderately salt tolerant plant. Jahangirnagar University J. Biol. Sci. 11(1 & 2): 13-20, 2022 (June & December)

Molecular characterization of endophytic fungi-Daldinia eschscholtzii from Aloe vera plants in Bangladesh

Abstract: Aloe vera (L.) Burm. f. is a plant of health, beauty and medicine that is widely used in Bangladesh with high demand. An experiment was performed to find out the association of endophytic fungus with Aloe vera leaves and to assess their growth behavior on different culture media, temperatures and pH. The endophytic fungus-Daldinia eschscholtzii (Ehrenb.) Rehm. was identified based on the morphological and molecular characterization using the ITS-rDNA sequence. Various solid culture media were used to assess the fungal growth, and temperature regimes i.e., 15℃, 20℃, 25℃, 30℃, 35℃ were investigated. The fungal endophyte showed maximum mycelial growth on Potato Sucrose Agar followed by Potato Dextrose Agar and Carrot Agar media. Optimum growth and development of the endophyte was recorded at temperature 25 to 35℃. We observed the effect of five different pH conditions, viz., 5, 6, 7, 8, 9 on the mycelial growth of the fungus. However, the fungal endophyte was very insensitive to the pH of the substrate. To the best of our knowledge, this is the first known occurrence of D. eschscholtzii as an endophyte in Aloe vera in Bangladesh. Jahangirnagar University J. Biol. Sci. 11(1 & 2): 1-11, 2022 (June & December)

Population, habitat use pattern and feeding behaviour of Irrawaddy squirrel (Callosciurus pygerythrus Geoffroy, 1831) in Jahangirnagar University campus

Abstract: The study was conducted to know the population, habitat use pattern and feeding behaviour of Irrawaddy Squirrel (Callosciurus pygerythrus) in Jahangirnagar University Campus from October 2016 to September 2017. The population density had slightly varied in different months; it was the highest in May (997.58/km2) and the lowest in January (612.98/km2). The mean population density was 841.34/km2 (SD= 135.98). The visibility was the highest at 0900h (15.71%) and the lowest at 1100h (7.07%). The monthly variation was the highest in May (9.88%) and the lowest in January (6.07%), which was probably due to the change of temperature. In total 15 plant species were preferably occupied by the squirrels in Jahangirnagar University Campus. The most preferable tree species was Koroi (Albizia procera) and the frequency was the highest for it as 16.71% of the total sightings of squirrel were in and around Koroi tree. The middle canopy was mostly used (48%) by Irrawaddy Squirrel, followed by lower canopy (29%), upper canopy (10%) and ground (13%). In case of diurnal variation in feeding the highest rate of feeding was recorded in afternoon (at 1700h, 18.46%) and morning (at 0800h, 17.06%). Maximum time spent in feeding was in May 2017(17.40%) and minimum in January 2017 (2.52%). The major items of their diet included fruits and seeds for which they spent 39.4% and 25.4% time, respectively. According to the study, squirrels of Jahangirnagar University Campus were not distributed uniformly, but concentrated in some areas due to vegetation type, food availability and human presence. The study also revealed that the squirrels of Jahangirnagar University campus showed variation in their food choice, feeding behavior and habitat preference. Jahangirnagar University J. Biol. Sci. 10(1 & 2): 19-29, 2021 (June & December)