http://202.45.146.37:8080/jspui/handle/123456789/10 Himalayan Journal of Science and Technology 2026-04-06T08:09:42Z http://202.45.146.37:8080/jspui/handle/123456789/76 Title: Occurrence of Red-Bloom in Fish Pond in Chitwan District, Nepal Authors: Mandal, Ram Bhajan; Rai, Sunila; Shrestha, Madhav Kumar; Jha, Dilip Kumar; Pandit, Narayan Prasad; Rai, Shiva Kumar Abstract: Red-bloom in !sh pond has become a common problem in Nepal. In order to assess causative agents and seasonal variations of red bloom in !sh pond, a study was conducted in the eastern, western and southern sites of Chitwan district from September, 2013 to June 2014. Preliminary data on occurrence and effect of red bloom were collected by visual observation and household survey of 30 randomly selected households using semi-structured questionnaire.Water quality and phytoplankton population were monitored in those ponds for four seasons, viz., autumn, winter, spring and summer. Among phytoplanktons, Euglena sanguinea was abundant in the pond water indicating the reason of red color in the pond. E. Sanguinea exhibited seasonal variation corresponding with the occurrence of red bloom in the pond. Highest density of E. Sanguinea was in summer (1628.4±70.4 number/L) which can be attributed to higher temperature and total nitrogen content of the water. Greater red bloom was observed in the southern site compared to eastern and western sites, where water was more stagnant, un-drainable and came from under-ground source. Description: 2017, HiJOST, Volume 1, Issue 1, Page 9-14 2018-08-23T00:00:00Z http://202.45.146.37:8080/jspui/handle/123456789/74 Title: Some New and Interesting Cyanobacteria from Baghjhoda Pond, Eastern Nepal Authors: Rajopadhyaya, Ritu; Shrestha, Sabitri; Rai, Shiva Kumar Abstract: Cyanobacteria of BaghJhoda pond in three different seasons hav been studied.Atotal of 8 cyanophycean algae under 6 genera viz., Anabaena, Aphanocapsa, Chroococcus, Oscillatoria, Phormidium and Spirulina were recorded. Anabaena, Oscillatoria and Phormidium were dominant genera and occurred in all three seasons. All the 8 taxa were new for the study area and Anabaena affinis andAnabaena subcylindricawere newrecords forNepal. 2018-08-21T00:00:00Z http://202.45.146.37:8080/jspui/handle/123456789/75 Title: Does Altitude Effect on Species Composition and Diversity on Himalayan Rangeland Authors: Limbu, Dilkumar; Koirala, Madan; Shang, Zhanhuan Abstract: Himalayan rangelands have diverse #oristic composition and important ecological services. The #oristic diversity and composition play an important role in grassland ecosystem regulation. It is different in altitudinal gradient due to grazing intensity, climatic condition and topography. To reveal the vegetation composition values, this work was conducted on August and September 2011 inTinjure-Milke mountain ridge, Guphapokhari, Nepal. In the present study we have described the impact of altitude on the species richness, species diversity and dispersion behavior of different plants (grasses) in Himalayan rangeland. The values of community indices were observed to be: RD (0.09 to 49.57), RF (3.57 to 14.71), RA(0.23 to 47.59), IVI (3.89 to 111.87), Shannan-Wiener diversity index (1.09 to 2.23) and species diversity evenness (0.12 to 0.19) at the study area, MilkeJaljale, eastern Nepal. Similarly, Species richness (R) value of 8.87 to 11.86 and Simpson dominant index value of 0.12 to 0.42 were observed. All diversity indices were reversed to altitudinal gradient higher the altitudes lower the values. Species richness of all plants showed a unimodal relationship with altitude. Similarly, negative correlation of density and species richness with altitude and slope was recorded. Key words: rangeland, himalaya, diversity index, grazing and elevation Description: Dil Kumar Limbu, Department of Biology, Central Campus of Technology, Dharan, Nepal 2018-08-31T00:00:00Z http://202.45.146.37:8080/jspui/handle/123456789/77 Title: Screening of Antibiotic Producing Actinomycetes for Antibiosis from Soil of Siraha, Nepal Authors: Sah, Shiv Nandan; Lekhak, Binod Abstract: The increasing need of novel antibiotics has provided a pace for the search of antibiotics from actinomycetes. Primary and secondary screenings of antibiotic producing actinomycetes from the soil of Siraha (75-600 m) were performed. The minimum inhibitory concentration of the metabolites was determined against E. coli. Macroscopic, microscopic and biochemical characterization were performed for the identi"cation of presumptive genera. Characterization of the antibacterial substances was done by TLC.Among 92 isolates, 22showed antibacterial activity against at least 1 bacterium out of 6 test bacteria used. Microscopy and other characteristics studies revealed that 19 (86.36%) were Streptomyces spp.,1 (4.55%) was Thermomonospora spp., and 2 (9.09%) were unidenti"ed. Five potent isolates were selected for the secondary screening where 2 isolates inhibited Gram negative bacteria with an MIC value of 1.2 mg/mL for each isolate. TLC showed that both antibiotics produced only one spot suggesting the presence of one active compound other than vancomycin (standard) . The active isolates from primary screening were heterogeneous in their overall macroscopic, biochemical, and physiological characteristics. The two potent isolates showing antibacterial activity were found to belong to different distinct taxonomic groups. Description: Central Campus of Technology, Hattisar, Dharan, Sunsari, Tribhuvan University, Nepal 2Central Department of Microbiology, Kirtipur, Kathmandu, Tribhuvan University, Nepal 2018-08-23T00:00:00Z