Pub Date : 2022-12-31DOI: 10.3126/njst.v21i1.49918
Rajan Suwal, Aakarsha Khawas
A dual structural system consists of a momentresisting frame, and vertical reinforced concrete walls called shear walls. Shear walls used in tall buildings are generally located around elevator cores and stairwells. Many possibilities exist in a tall building regarding the location, shape, number, and arrangement of shear walls. Shear walls generally start at the foundation level and are continuous throughout the building height. Their thickness can be as low as 150mm in lowrise to medium-rise buildings or as high as 400mm in high-rise buildings. To establish an effective lateral force-resisting system, the shear walls are located in preferable positions in a structure that minimizes lateral displacements. The shear walls are situated in ideal locations to be symmetrical and torsional effects get reduced. Based on the comparison of various literature regarding the shear wall positions, the shear wall placement at the core or the corners of the structure symmetrically gives the best performance to reduce displacement and story drift. Also, lateral displacement diminishes when the shear wall’s thickness increases.
{"title":"Performance of Reinforced Concrete Shear Wall In Dual Structural System: A Review","authors":"Rajan Suwal, Aakarsha Khawas","doi":"10.3126/njst.v21i1.49918","DOIUrl":"https://doi.org/10.3126/njst.v21i1.49918","url":null,"abstract":"A dual structural system consists of a momentresisting frame, and vertical reinforced concrete walls called shear walls. Shear walls used in tall buildings are generally located around elevator cores and stairwells. Many possibilities exist in a tall building regarding the location, shape, number, and arrangement of shear walls. Shear walls generally start at the foundation level and are continuous throughout the building height. Their thickness can be as low as 150mm in lowrise to medium-rise buildings or as high as 400mm in high-rise buildings. To establish an effective lateral force-resisting system, the shear walls are located in preferable positions in a structure that minimizes lateral displacements. The shear walls are situated in ideal locations to be symmetrical and torsional effects get reduced. Based on the comparison of various literature regarding the shear wall positions, the shear wall placement at the core or the corners of the structure symmetrically gives the best performance to reduce displacement and story drift. Also, lateral displacement diminishes when the shear wall’s thickness increases.","PeriodicalId":129302,"journal":{"name":"Nepal Journal of Science and Technology","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114864832","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 : 2022-12-31DOI: 10.3126/njst.v21i1.49920
Satish Chaudhary, A. P. Singh, Devender Sharma
The history of air traffic, whether its about the safety or the qualitative inspection of the several sensors and interconnected mechanical parts, is well known. Hence, the efforts applied through the research and analysis of several engineers profoundly made the air traffic investigation safer and more comfortable. As a result,the flight investigation of whether the lost aircraft or the airplane’s found wreckage has become more secure and convenient than in the Past. The use of light and advanced materials, the development of excellent communication equipment, and the rapid development of the aviation sector have played a crucial role in increasing its safety and reach to the general public, and so do the several challenges associated with the aviation sector. As a result, there has been much research regarding the air traffic investigation with the help of advanced sensor and better software that can simulate and even predict the dangers provided by several parameters helping in the investigation and exploring better sides of safety. The accident can be prevented with the help of improvements provided based on accurate analysis of previous air accidents. In modern aircraft, there is a device called the Black Box which helps analyze and investigate. For example, after Malaysian flight MH370’s disappearance, the airline again felt to upgrade the black box to a new working standard of the cloud-based technology. Currently, there are many cloud storage services worldwide such as GOOGLE, APPLE, AMAZON, MICROSOFT etc. After this accident and similar previous aircraft disappearances from different parts of the world, researchers finally decided to test steaming to nearby air traffic services and storing flight data in remote cloud storage. This study attempts to compile the worldwide efforts in the cloud-integrated flight data recorder (CIFDR) field. This research primarily focuses on different ways of storing data on cloud-based technology. The different trend worldwide approaches and different means applied to test this system without hindering the associated safety of the data going through encryption and decryption. Recently there has been a proliferation of internet facilities in flight. Although it is still in its infancy phase, the flight data can be sent to remote servers by improving this technique. Many challenges in transmitting flight data in real-time need to be overcome before commercializing this technique.
{"title":"A Broad Perspective on Cloud Integrated Flight Data Recorder","authors":"Satish Chaudhary, A. P. Singh, Devender Sharma","doi":"10.3126/njst.v21i1.49920","DOIUrl":"https://doi.org/10.3126/njst.v21i1.49920","url":null,"abstract":"The history of air traffic, whether its about the safety or the qualitative inspection of the several sensors and interconnected mechanical parts, is well known. Hence, the efforts applied through the research and analysis of several engineers profoundly made the air traffic investigation safer and more comfortable. As a result,the flight investigation of whether the lost aircraft or the airplane’s found wreckage has become more secure and convenient than in the Past. The use of light and advanced materials, the development of excellent communication equipment, and the rapid development of the aviation sector have played a crucial role in increasing its safety and reach to the general public, and so do the several challenges associated with the aviation sector. As a result, there has been much research regarding the air traffic investigation with the help of advanced sensor and better software that can simulate and even predict the dangers provided by several parameters helping in the investigation and exploring better sides of safety. The accident can be prevented with the help of improvements provided based on accurate analysis of previous air accidents. In modern aircraft, there is a device called the Black Box which helps analyze and investigate. For example, after Malaysian flight MH370’s disappearance, the airline again felt to upgrade the black box to a new working standard of the cloud-based technology. Currently, there are many cloud storage services worldwide such as GOOGLE, APPLE, AMAZON, MICROSOFT etc. After this accident and similar previous aircraft disappearances from different parts of the world, researchers finally decided to test steaming to nearby air traffic services and storing flight data in remote cloud storage. This study attempts to compile the worldwide efforts in the cloud-integrated flight data recorder (CIFDR) field. This research primarily focuses on different ways of storing data on cloud-based technology. The different trend worldwide approaches and different means applied to test this system without hindering the associated safety of the data going through encryption and decryption. Recently there has been a proliferation of internet facilities in flight. Although it is still in its infancy phase, the flight data can be sent to remote servers by improving this technique. Many challenges in transmitting flight data in real-time need to be overcome before commercializing this technique.","PeriodicalId":129302,"journal":{"name":"Nepal Journal of Science and Technology","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126643615","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 : 2022-12-31DOI: 10.3126/njst.v21i1.49908
Bishnu Maya K.C, Dhurva Prasad Gauchan, S. Khanal, Janardan Lamichhane
Plant growth-promoting rhizobacteria (PGPR) are a group of root-associated bacteria that intimately interact with the plant roots and consequently enhance growth by extemporising nutrient retrieval or phytohormone production. We isolated and screened indigenous phosphate solubilising and auxinproducing PGPR from bamboo rhizosphere. 66 soil samples from bamboo (Bambusa nutans subsp. cupulata, B. balcooa and B. tulda) rhizospheres were collected from Dhanusha, Mahottari and Sarlahi districts, Nepal. 120 isolates of PGPR were obtained by serial dilution method in (PVK) agar and Luria Bertani agar. 92 out of 120 isolates of PGPR with the ability to solubilise phosphate were selected based on the halo colony ratio in PVK agar medium and auxin production in Luria Bertani agar. Among them, six isolates having high phosphate solubilising index and high production capacity of indole-3-acetic acid were further screened. Biochemical analysis revealed that these isolates belonged to the genus Pseudomonas. Phosphate solubilising index and indole-3- acetic acid production by six isolates ranged from 4.19±0.8 to 7.65±1.3, and IAA production ranged from 72.93±0.2 to 82.48±0.9µg/ml respectively. These isolates significantly increased shoot length (13.26±0.56cm), shoot fresh weight (16.26±1.02mg), shoot dry weight (10.56±0.09mg), root length (4.9±0.5cm), root fresh weight (7.56±1.05mg), root dry weight (3.21±0.01mg), and chlorophyll ‘a’ and chlrophyll‘b’ and carotenoid (2.16±0.01mg/g, 1.19±0.06mg/g and 0.92±0.01mg/g respectively) of B. nutans subsp. cupulata seedlings. This study suggests that PGPR isolated from bamboo rhizosphere demonstrated outstanding contribution to the growth promotion of seedlings of B. nutans subsp. cupulata as compared to negative control.
{"title":"Isolation and Characterization of Plant Growth promoting Rhizobacteria from Bamboo Rhizosphere and Their Role in Plant Growth Promotion","authors":"Bishnu Maya K.C, Dhurva Prasad Gauchan, S. Khanal, Janardan Lamichhane","doi":"10.3126/njst.v21i1.49908","DOIUrl":"https://doi.org/10.3126/njst.v21i1.49908","url":null,"abstract":"Plant growth-promoting rhizobacteria (PGPR) are a group of root-associated bacteria that intimately interact with the plant roots and consequently enhance growth by extemporising nutrient retrieval or phytohormone production. We isolated and screened indigenous phosphate solubilising and auxinproducing PGPR from bamboo rhizosphere. 66 soil samples from bamboo (Bambusa nutans subsp. cupulata, B. balcooa and B. tulda) rhizospheres were collected from Dhanusha, Mahottari and Sarlahi districts, Nepal. 120 isolates of PGPR were obtained by serial dilution method in (PVK) agar and Luria Bertani agar. 92 out of 120 isolates of PGPR with the ability to solubilise phosphate were selected based on the halo colony ratio in PVK agar medium and auxin production in Luria Bertani agar. Among them, six isolates having high phosphate solubilising index and high production capacity of indole-3-acetic acid were further screened. Biochemical analysis revealed that these isolates belonged to the genus Pseudomonas. Phosphate solubilising index and indole-3- acetic acid production by six isolates ranged from 4.19±0.8 to 7.65±1.3, and IAA production ranged from 72.93±0.2 to 82.48±0.9µg/ml respectively. These isolates significantly increased shoot length (13.26±0.56cm), shoot fresh weight (16.26±1.02mg), shoot dry weight (10.56±0.09mg), root length (4.9±0.5cm), root fresh weight (7.56±1.05mg), root dry weight (3.21±0.01mg), and chlorophyll ‘a’ and chlrophyll‘b’ and carotenoid (2.16±0.01mg/g, 1.19±0.06mg/g and 0.92±0.01mg/g respectively) of B. nutans subsp. cupulata seedlings. This study suggests that PGPR isolated from bamboo rhizosphere demonstrated outstanding contribution to the growth promotion of seedlings of B. nutans subsp. cupulata as compared to negative control.","PeriodicalId":129302,"journal":{"name":"Nepal Journal of Science and Technology","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114082219","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 : 2022-12-31DOI: 10.3126/njst.v21i1.49960
S. Nyaupane, R. Mainali, S. Kafle, Ajaya SR Bajracharya
Fall armyworm (FAW), Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae), is an economically important invasive pest species primarily infesting maize. It is highly polyphagous and migratory in nature, posing a threat to several economically important crops. This pest has traveled a long journey from the American continent to Asia via Africa. This insect has inflicted substantial damage to Maize’s crop productivity of Maize in Nepal, since its introduction in May 2019 and has now become widespread from plain regions to hilly regions of the country. Therefore, this pest problem is considered a major issue for research and development in the country. The lessons from world research and development in the fall armyworm management could be adapted and used in Nepal after its proper validation. In order to identify the current status of fall armyworm in Nepal and the management of the insect species, we have discussed overviews on biology, ecology, origin and distribution pathway, management, and way forward, focusing on sustainable measures which could be useful for designing integrated pest management of fall armyworm in Nepal since knowledge gap is large.
秋粘虫(FAW)，又称夜蛾科(Spodoptera frugiperda, J. E. Smith)，是一种主要侵染玉米的重要经济入侵害虫。它是高度多食性和洄游性的，对几种重要的经济作物构成威胁。这种害虫从美洲大陆经过非洲长途跋涉来到亚洲。自2019年5月引入以来，这种昆虫对尼泊尔的玉米作物生产力造成了重大损害，目前已从该国的平原地区蔓延到丘陵地区。因此，这种害虫问题被认为是该国研究和发展的一个主要问题。世界在秋粘虫管理方面的研究和发展的经验可以在尼泊尔经过适当的验证后加以改编和使用。为了确定尼泊尔秋粘虫的现状和物种管理，我们讨论了生物学、生态学、起源和分布途径、管理和未来的发展方向，重点讨论了可持续措施，这些措施可能有助于尼泊尔秋粘虫的综合管理，因为尼泊尔的知识差距很大。
{"title":"Fall Armyworm: Current Status in Nepal, its Management and Way Forward","authors":"S. Nyaupane, R. Mainali, S. Kafle, Ajaya SR Bajracharya","doi":"10.3126/njst.v21i1.49960","DOIUrl":"https://doi.org/10.3126/njst.v21i1.49960","url":null,"abstract":"Fall armyworm (FAW), Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae), is an economically important invasive pest species primarily infesting maize. It is highly polyphagous and migratory in nature, posing a threat to several economically important crops. This pest has traveled a long journey from the American continent to Asia via Africa. This insect has inflicted substantial damage to Maize’s crop productivity of Maize in Nepal, since its introduction in May 2019 and has now become widespread from plain regions to hilly regions of the country. Therefore, this pest problem is considered a major issue for research and development in the country. The lessons from world research and development in the fall armyworm management could be adapted and used in Nepal after its proper validation. In order to identify the current status of fall armyworm in Nepal and the management of the insect species, we have discussed overviews on biology, ecology, origin and distribution pathway, management, and way forward, focusing on sustainable measures which could be useful for designing integrated pest management of fall armyworm in Nepal since knowledge gap is large.","PeriodicalId":129302,"journal":{"name":"Nepal Journal of Science and Technology","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128517038","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 : 2022-12-31DOI: 10.3126/njst.v21i1.49917
P. L. Homagai, Sanjita Rayamajhi, Dilli Dhami, R. L. Shrestha, D. Bhattarai
Chemically treated Sal sawdust was used to study the adsorption of Malachite Green (MG) dye from an aqueous solution. Raw Sal sawdust (RSSD) was charred and aminated. The surface functional groups of raw and modified adsorbents were determined by Fourier Transform Infrared Spectra (FTIR). The influence of pH on batch experiments, concentration and contact time for charred Sal sawdust (CSSD) and aminated Sal sawdust (ASSD) were investigated. The dye uptake was highest at a pH of 4, and adsorption was found to be 62.63 % and 92.15% for CSSD and ASSD, respectively, at an adsorbent dose of 0.025 g and agitation speed of 190 rotations per minute (rpm). The pertinency of Langmuir isotherm was tested, and the kinetic data was found best fitted for pseudo-second-order. The adsorption capacity of MG dye onto ASSD and CSSD was found to be 91.9 mg/g and 64 mg/g, correspondingly. This showed that ASSD is a more efficient adsorbent than CSSD for excluding MG dye from an aqueous solution.
{"title":"Comparative Adsorption Behavior of Malachite Green Dye onto Charred and Aminated Sal (Shorea robusta) Sawdust from Aqueous Solution","authors":"P. L. Homagai, Sanjita Rayamajhi, Dilli Dhami, R. L. Shrestha, D. Bhattarai","doi":"10.3126/njst.v21i1.49917","DOIUrl":"https://doi.org/10.3126/njst.v21i1.49917","url":null,"abstract":"Chemically treated Sal sawdust was used to study the adsorption of Malachite Green (MG) dye from an aqueous solution. Raw Sal sawdust (RSSD) was charred and aminated. The surface functional groups of raw and modified adsorbents were determined by Fourier Transform Infrared Spectra (FTIR). The influence of pH on batch experiments, concentration and contact time for charred Sal sawdust (CSSD) and aminated Sal sawdust (ASSD) were investigated. The dye uptake was highest at a pH of 4, and adsorption was found to be 62.63 % and 92.15% for CSSD and ASSD, respectively, at an adsorbent dose of 0.025 g and agitation speed of 190 rotations per minute (rpm). The pertinency of Langmuir isotherm was tested, and the kinetic data was found best fitted for pseudo-second-order. The adsorption capacity of MG dye onto ASSD and CSSD was found to be 91.9 mg/g and 64 mg/g, correspondingly. This showed that ASSD is a more efficient adsorbent than CSSD for excluding MG dye from an aqueous solution.","PeriodicalId":129302,"journal":{"name":"Nepal Journal of Science and Technology","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127609512","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 : 2022-12-31DOI: 10.3126/njst.v21i1.49911
K. Chiluwal, E. Shrestha, S. Devkota, K. Shrestha, S. Sigdel, A. Khanal, RB Basnet, B. Upadhyay, LN `Aryal
Tephritids are the major challenges for fruit and fleshy vegetable growers of the tropics and subtropics. Nepal also incurs huge losses of fruits and vegetables to the tephritids. This study was designed to identify the tephritid flies in Malepatan and Lumle of Gandaki Province. Bucket traps baited with methyl eugenol (ME) in Malepatan, and ME, cue lure (CL) and a mixture of ME and CL (ME+CL) with different releasers; tube, cotton and paper were installed at Lumle in 2020 summer. Three species of the fly (Bactrocera dorsalis, Bactrocera zonata and Bactrocera correcta) were recorded from Malepatan, dominated by B. dorsalis. The B. correcta count was negligible. While in Lumle, B. dorsalis was the most dominant, followed by B. zonata till July, after which, till August, B. tau followed the B. dorsalis. Seven species of the tephritids (B. zonata, B. dorsalis, B. tau, B. diversa, B. scutellaris, B. correcta and B. cucurbitae) were recorded from this region. Among the releasers, paper releaser was found more effective as compared to cotton and tube. However, the lures should be changed in a short interval, by two weeks, to acquire a satisfactory result. This study unveils that the study site already inhabits seven species of fruit flies. So, the monitoring with different cues could be an effective tool for species actuation. Additionally, the paper releasers could be recommended for further use in the traps for monitoring and mass trapping purposes.
{"title":"Identification of Cucurbit Fruit Flies and Their Relative Attractiveness to Different Cues and Releasers","authors":"K. Chiluwal, E. Shrestha, S. Devkota, K. Shrestha, S. Sigdel, A. Khanal, RB Basnet, B. Upadhyay, LN `Aryal","doi":"10.3126/njst.v21i1.49911","DOIUrl":"https://doi.org/10.3126/njst.v21i1.49911","url":null,"abstract":"Tephritids are the major challenges for fruit and fleshy vegetable growers of the tropics and subtropics. Nepal also incurs huge losses of fruits and vegetables to the tephritids. This study was designed to identify the tephritid flies in Malepatan and Lumle of Gandaki Province. Bucket traps baited with methyl eugenol (ME) in Malepatan, and ME, cue lure (CL) and a mixture of ME and CL (ME+CL) with different releasers; tube, cotton and paper were installed at Lumle in 2020 summer. Three species of the fly (Bactrocera dorsalis, Bactrocera zonata and Bactrocera correcta) were recorded from Malepatan, dominated by B. dorsalis. The B. correcta count was negligible. While in Lumle, B. dorsalis was the most dominant, followed by B. zonata till July, after which, till August, B. tau followed the B. dorsalis. Seven species of the tephritids (B. zonata, B. dorsalis, B. tau, B. diversa, B. scutellaris, B. correcta and B. cucurbitae) were recorded from this region. Among the releasers, paper releaser was found more effective as compared to cotton and tube. However, the lures should be changed in a short interval, by two weeks, to acquire a satisfactory result. This study unveils that the study site already inhabits seven species of fruit flies. So, the monitoring with different cues could be an effective tool for species actuation. Additionally, the paper releasers could be recommended for further use in the traps for monitoring and mass trapping purposes.","PeriodicalId":129302,"journal":{"name":"Nepal Journal of Science and Technology","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132170630","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 : 2022-12-31DOI: 10.3126/njst.v21i1.49919
Sulochana Pradhan, Jarina Joshi
Much work in a microbial fuel cell (MFC) is necessary in today’s context to meet an environmentfriendly and sustainable technology for alternative energy. A huge depletion in fossil fuel is going on rapidly. There may be high chance of a fuel crisis and global warming shortly. MFC is a promising technology in the field of energy production. MFC is a promising technology in the field of energy production. MFC operates with the degradation of different types of wastes by generating various by-products. Proper design and operation of MFC help to get optimum output. The performance of MFC depends on appropriate electrode materials, substrates, pH and type of microbes grown. In MFC, microbial oxidation of natural wastes occurs at ambient temperature. The generated reaction produces energy.
{"title":"A Review on Microbial Fuel Cell Performance for Energy Generation","authors":"Sulochana Pradhan, Jarina Joshi","doi":"10.3126/njst.v21i1.49919","DOIUrl":"https://doi.org/10.3126/njst.v21i1.49919","url":null,"abstract":"Much work in a microbial fuel cell (MFC) is necessary in today’s context to meet an environmentfriendly and sustainable technology for alternative energy. A huge depletion in fossil fuel is going on rapidly. There may be high chance of a fuel crisis and global warming shortly. MFC is a promising technology in the field of energy production. MFC is a promising technology in the field of energy production. MFC operates with the degradation of different types of wastes by generating various by-products. Proper design and operation of MFC help to get optimum output. The performance of MFC depends on appropriate electrode materials, substrates, pH and type of microbes grown. In MFC, microbial oxidation of natural wastes occurs at ambient temperature. The generated reaction produces energy.","PeriodicalId":129302,"journal":{"name":"Nepal Journal of Science and Technology","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130201242","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 : 2022-12-31DOI: 10.3126/njst.v21i1.49912
M. Adhikari
Oidium species parasitic on mango leaves (Mangifera indica L.) was gathered from Bhanimandal, Lalitpur, Nepal. The previous studies done from Nepal has been revised based on study of recent collection, available literature and reports. It was concluded that the fungus was Erysiphe quercicola S. Takam. & U. Braun
在尼泊尔拉利特普尔的Bhanimandal地区采集到寄生在芒果叶片上的黄体虫。先前在尼泊尔进行的研究已根据最近收集的研究、现有文献和报告进行了修订。结果表明，该真菌为Erysiphe quercicola S. Takam。&布劳恩
{"title":"Oidium (powdery mildew: Erysiphales) Parasitic on Mangifera indica L (Mango) in Nepal: A Taxonomic Approach","authors":"M. Adhikari","doi":"10.3126/njst.v21i1.49912","DOIUrl":"https://doi.org/10.3126/njst.v21i1.49912","url":null,"abstract":"Oidium species parasitic on mango leaves (Mangifera indica L.) was gathered from Bhanimandal, Lalitpur, Nepal. The previous studies done from Nepal has been revised based on study of recent collection, available literature and reports. It was concluded that the fungus was Erysiphe quercicola S. Takam. & U. Braun","PeriodicalId":129302,"journal":{"name":"Nepal Journal of Science and Technology","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129346533","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 : 2022-12-31DOI: 10.3126/njst.v21i1.49913
N. Shakya, S. Khanal, G. Joshi, D. Pant
Various species of Gentiana find their use to treat various digestive and topical ailments in traditional medicine in Nepal. The present work reports the results of preliminary phytochemical analysis and biological activities of extracts of four different species of Gentiana (G. depressa, G.ornata, G. urnula, and G. capitata) from Nepal Himalaya. Furthermore, the study also reports a semi-quantitative estimation of major bioactive compounds in those extracts. The total flavonoid content was found to be highest (19.09±0.97mgQE/g) in methanol extracts of G. capitata and lowest (4.22±0.66 mgQE/g) in aqueous extracts of G. urnula. The highest amount (79.2±19.19 mgGAE/g) of total phenolic content was observed in methanolic extracts of G. depressa, while the lowest amount (37.11±2.18 mgGAE/g) was observed in aqueous extract of G. urnula. The methanol extract of G. depressa showed the best antioxidant activity among the Gentiana species tested. Extracts of all the species tested showed weak antibacterial activity even at the highest concentration of the extract. Semi-quantitative estimation showed that swertiamarin was in higher quantities than amarogentin and mangiferin. The highest concentration of swertiamarin and mangiferin (0.109±0.013 mg/g and 0.018±0.001 mg/g, respectively) was identified in G. ornata, while the highest concentration of amarogentin (0.075±0.005 mg/g) was observed in G. capitata. These results justify the folklore use of these species in traditional medicinal practices in Nepal.
{"title":"Phytochemical Screening and Evaluation of Antioxidant and Antibacterial Potential of Selected Species of Gentiana from Nepal Himalaya","authors":"N. Shakya, S. Khanal, G. Joshi, D. Pant","doi":"10.3126/njst.v21i1.49913","DOIUrl":"https://doi.org/10.3126/njst.v21i1.49913","url":null,"abstract":"Various species of Gentiana find their use to treat various digestive and topical ailments in traditional medicine in Nepal. The present work reports the results of preliminary phytochemical analysis and biological activities of extracts of four different species of Gentiana (G. depressa, G.ornata, G. urnula, and G. capitata) from Nepal Himalaya. Furthermore, the study also reports a semi-quantitative estimation of major bioactive compounds in those extracts. The total flavonoid content was found to be highest (19.09±0.97mgQE/g) in methanol extracts of G. capitata and lowest (4.22±0.66 mgQE/g) in aqueous extracts of G. urnula. The highest amount (79.2±19.19 mgGAE/g) of total phenolic content was observed in methanolic extracts of G. depressa, while the lowest amount (37.11±2.18 mgGAE/g) was observed in aqueous extract of G. urnula. The methanol extract of G. depressa showed the best antioxidant activity among the Gentiana species tested. Extracts of all the species tested showed weak antibacterial activity even at the highest concentration of the extract. Semi-quantitative estimation showed that swertiamarin was in higher quantities than amarogentin and mangiferin. The highest concentration of swertiamarin and mangiferin (0.109±0.013 mg/g and 0.018±0.001 mg/g, respectively) was identified in G. ornata, while the highest concentration of amarogentin (0.075±0.005 mg/g) was observed in G. capitata. These results justify the folklore use of these species in traditional medicinal practices in Nepal.","PeriodicalId":129302,"journal":{"name":"Nepal Journal of Science and Technology","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121903320","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 : 2022-12-31DOI: 10.3126/njst.v21i1.49909
Deepa Dhital, Bikash Gosain, S. R. Maharjan
The predicted increasing atmospheric carbon dioxide (CO2) level is responsive to altering the future climate, and a small change in the soil carbon may significantly affect the forest carbon cycle and climate system. Soil respiration (SR) and its influencing factors like soil temperature (ST), soil water content (SWC) and surface litter-fall were measured monthly over one year in a sub-tropical Pine (Pinus roxburghii) forest of Bhaktapur district located in central Nepal to determine the SR of the forest and, its variations and sensitivity. The results showed that SR varied to the changes in ST by an exponential significant positive correlation between them. The optimum SR was observed between 10 and 22ºC, and the highest SR were obtained above ST at 20ºC. The temperature sensitivity value of SR (Q10) was estimated at Q10 = 2.13. The significant exponential curve represented the effect of SWC on SR. The higher SR rate was mostly measured between 10 and 25% SWC. The monthly and seasonal variations of the SR rate were consistent with the ST, SWC and litter-fall variations. The study showed that the combined effect of temperature and precipitation might be the major cause of SR variations; however, ST is adequate for increasing SR. Hence, the warming further enhances carbon emission from the forest floor and inversely increases carbon to contribute to climatic change through this pine-dominated forest stand structure.
{"title":"Soil Carbon Fluxes and Sensitivity Analysis – A Study in Pinus roxburghii Forest","authors":"Deepa Dhital, Bikash Gosain, S. R. Maharjan","doi":"10.3126/njst.v21i1.49909","DOIUrl":"https://doi.org/10.3126/njst.v21i1.49909","url":null,"abstract":"The predicted increasing atmospheric carbon dioxide (CO2) level is responsive to altering the future climate, and a small change in the soil carbon may significantly affect the forest carbon cycle and climate system. Soil respiration (SR) and its influencing factors like soil temperature (ST), soil water content (SWC) and surface litter-fall were measured monthly over one year in a sub-tropical Pine (Pinus roxburghii) forest of Bhaktapur district located in central Nepal to determine the SR of the forest and, its variations and sensitivity. The results showed that SR varied to the changes in ST by an exponential significant positive correlation between them. The optimum SR was observed between 10 and 22ºC, and the highest SR were obtained above ST at 20ºC. The temperature sensitivity value of SR (Q10) was estimated at Q10 = 2.13. The significant exponential curve represented the effect of SWC on SR. The higher SR rate was mostly measured between 10 and 25% SWC. The monthly and seasonal variations of the SR rate were consistent with the ST, SWC and litter-fall variations. The study showed that the combined effect of temperature and precipitation might be the major cause of SR variations; however, ST is adequate for increasing SR. Hence, the warming further enhances carbon emission from the forest floor and inversely increases carbon to contribute to climatic change through this pine-dominated forest stand structure.","PeriodicalId":129302,"journal":{"name":"Nepal Journal of Science and Technology","volume":"253 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131462218","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：