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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 374 journals)
Showing 201 - 265 of 265 Journals sorted alphabetically
Jurnal Udayana Mengabdi     Open Access  
Karaelmas Science and Engineering Journal     Open Access  
Karbala International Journal of Modern Science     Open Access  
Kennedy Institute of Ethics Journal     Full-text available via subscription   (Followers: 10)
LOGIKA Jurnal Ilmiah Lemlit Unswagati Cirebon     Open Access  
Makara Journal of Science     Open Access  
Malawi Journal of Science and Technology     Open Access   (Followers: 6)
Maskana     Open Access  
Matters Select     Open Access  
MethodsX     Open Access   (Followers: 1)
Metode & Forskningsdesign     Open Access  
Mètode Science Studies Journal : Annual Review     Open Access  
Middle East Journal of Science     Open Access  
Middle European Scientific Bulletin     Open Access  
Modern Applied Science     Open Access   (Followers: 1)
Momona Ethiopian Journal of Science     Open Access   (Followers: 5)
MUST : Journal of Mathematics Education, Science and Technology     Open Access   (Followers: 4)
Mutis     Open Access  
National Academy Science Letters     Hybrid Journal   (Followers: 3)
National Science Review     Hybrid Journal   (Followers: 1)
Natural Sciences     Open Access  
Natural Sciences Education     Hybrid Journal  
Naturen     Full-text available via subscription  
Nepal Journal of Science and Technology     Open Access  
Network Science     Hybrid Journal   (Followers: 4)
New Directions in the Teaching of Physical Sciences     Open Access   (Followers: 2)
Nordic Journal of Science and Technology     Open Access   (Followers: 2)
Nordic Studies in Science Education     Open Access   (Followers: 3)
Nova     Open Access  
Nuncius     Hybrid Journal   (Followers: 2)
OmniScience : A Multi-disciplinary Journal     Full-text available via subscription  
Open Conference Proceedings Journal     Open Access  
Open Journal of Applied Sciences     Open Access  
Orbis Cógnita : Revista Científica     Open Access   (Followers: 2)
Patterns     Open Access  
PENDIPA : Journal of Science Education     Open Access  
People and Nature     Open Access   (Followers: 3)
Población y Desarrollo - Argonautas y caminantes     Open Access  
Politique et Sociétés     Full-text available via subscription   (Followers: 1)
Portal de la Ciencia     Open Access  
Proceedings of the Indian National Science Academy     Full-text available via subscription  
Proceedings of the Linnean Society of New South Wales     Full-text available via subscription   (Followers: 2)
Proceedings of the Royal Society of Queensland, The     Full-text available via subscription  
QScience Connect     Open Access  
RAC: Revista Angolana de Ciências     Open Access  
Rafidain Journal of Science     Open Access  
Rehabilitation Research, Policy, and Education     Hybrid Journal   (Followers: 2)
Rekayasa     Open Access  
Reportes Científicos de la FaCEN     Open Access  
Reports in Advances of Physical Sciences     Open Access  
Research     Open Access   (Followers: 1)
Research Ideas and Outcomes     Open Access  
Research Integrity and Peer Review     Open Access  
Research Policy : X     Open Access   (Followers: 2)
Respuestas     Open Access  
Reviews in Theoretical Science     Full-text available via subscription  
Revista Bases de la Ciencia     Open Access  
Revista Binacional Brasil - Argentina: Diálogo entre as ciências     Open Access  
Revista Brasileira de Iniciação Científica     Open Access  
Revista Catarinense da Ciência Contábil     Open Access  
Revista Ciencia y Tecnología     Open Access  
Revista Ciência, Tecnologia & Ambiente     Open Access  
Revista Científica de la FAREM     Open Access  
Revista Científica de la Universidad Nacional del Este     Open Access  
Revista Cientifica Guillermo de Ockham     Open Access  
Revista Científica y Tecnológica UPSE     Open Access  
Revista Conhecimento Online     Open Access  
Revista Crítica de Ciências Sociais     Open Access  
Revista de Ciencia y Tecnología     Open Access  
Revista de Información Científica     Open Access  
Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales     Open Access  
Revista de la Sociedad Científica del Paraguay     Open Access  
Revista de la Universidad del Zulia     Open Access  
Revista Eletrônica Ludus Scientiae     Open Access  
Revista Logos Ciencia & Tecnología     Open Access  
Revista MundoFesc     Open Access  
Revista Politécnica     Open Access  
Revista Saber Digital     Open Access  
Revista Sociedad y Economía     Open Access  
Revista Tecnológica     Open Access  
Revista Theoria     Open Access   (Followers: 1)
Revista UNIMAR     Open Access  
Revista UniVap     Open Access  
Revista Vivências em Ensino de Ciências     Open Access   (Followers: 1)
Rihan Journal for Scientific Publishing     Open Access  
Royal Society Open Science     Open Access   (Followers: 7)
Ruhuna Journal of Science     Open Access  
Sainstek : Jurnal Sains dan Teknologi     Open Access  
SAINSTIS     Open Access  
Sainteknol : Jurnal Sains dan Teknologi     Open Access  
Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi     Open Access  
Scholedge International Journal of Multidisciplinary & Allied Studies     Open Access  
Sci     Open Access  
Science     Full-text available via subscription   (Followers: 4345)
Science & Diplomacy     Free   (Followers: 3)
Science & Technology Studies     Open Access   (Followers: 3)
Science Advances     Free   (Followers: 27)
Science and Technology     Open Access   (Followers: 2)
Science Diliman     Open Access  
Science Heritage Journal     Open Access  
Science World Journal     Open Access  
Science, Technology and Arts Research Journal     Open Access   (Followers: 1)
ScienceRise     Open Access  
Sciences du jeu     Open Access  
Sciential     Open Access  
Scientific African     Open Access  
Scientific American     Full-text available via subscription   (Followers: 446)
Scientific American Mind     Full-text available via subscription   (Followers: 10)
Scientific Bulletin     Open Access  
Scientific Data     Open Access   (Followers: 5)
Scientific Journal of Mehmet Akif Ersoy University     Open Access  
Scientific Journal of Pure and Applied Sciences     Open Access   (Followers: 1)
Scientific Reports     Open Access   (Followers: 85)
Scientific World     Open Access  
Scientonomy : Journal for the Science of Science     Open Access   (Followers: 1)
Scienze Regionali : Italian Journal of Regional Science     Full-text available via subscription   (Followers: 18)
Selforganizology     Open Access  
Seminário de Iniciação Científica e Seminário Integrado de Ensino, Pesquisa e Extensão     Open Access  
Simbiótica     Open Access  
SINET : Ethiopian Journal of Science     Open Access   (Followers: 5)
Smart Science     Open Access  
South African Journal of Science     Open Access   (Followers: 3)
South American Sciences     Open Access  
South East European University Review (SEEU Review)     Open Access   (Followers: 2)
Springer Science Reviews     Hybrid Journal   (Followers: 2)
Studies in Science Education     Hybrid Journal   (Followers: 18)
Sultan Qaboos University Journal for Science     Open Access  
Tanzania Journal of Science     Open Access   (Followers: 4)
TD : The Journal for Transdisciplinary Research in Southern Africa     Open Access  
Technologies     Open Access   (Followers: 1)
TECNOSCIENZA: Italian Journal of Science & Technology Studies     Open Access   (Followers: 1)
Temas y Debates     Open Access  
The Innovation     Open Access  
The Scientific World Journal     Open Access  
The Social Studies     Hybrid Journal   (Followers: 3)
The Winnower     Open Access  
Theoria     Open Access   (Followers: 3)
THEORIA : An International Journal for Theory, History and Foundations of Science     Full-text available via subscription   (Followers: 1)
Transactions of Tianjin University     Full-text available via subscription  
Trilogía     Open Access  
TÜBAV Bilim Dergisi     Open Access  
Türk Bilim ve Mühendislik Dergisi     Open Access  
Tydskrif vir Geesteswetenskappe     Open Access  
Uluslararası Bilimsel Araştırmalar Dergisi (IBAD)     Open Access   (Followers: 1)
UNED Research Journal / Cuadernos de Investigación UNED     Open Access  
Uni-pluriversidad     Open Access  
Uniciencia     Open Access  
Universidad, Ciencia y Tecnología     Open Access  
Universitas (León)     Open Access  
Universitas Scientiarum     Open Access  
Unnes Science Education Journal     Open Access  
Vilnius University Proceedings     Open Access  
Walailak Journal of Science and Technology     Open Access  
WikiJournal of Science     Open Access  
World Scientific Research     Open Access  
Zeitschrift für Didaktik der Naturwissenschaften     Hybrid Journal  
Образование и наука     Open Access   (Followers: 1)
Східно-Європейський журнал передових технологій : Eastern-European Journal of Enterprise Technologies     Open Access   (Followers: 2)

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Nepal Journal of Science and Technology
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1994-1412
Published by Nepal Journals Online Homepage  [114 journals]
  • Team

    • Authors: NJST
      Abstract: N/A
      PubDate: 2022-04-03
      Issue No: Vol. 20, No. 1 (2022)
       
  • Reviewers and Editors List

    • Authors: NJST Editorial
      Abstract: N/A
      PubDate: 2022-04-03
      Issue No: Vol. 20, No. 1 (2022)
       
  • Editorial Message

    • Authors: Dr. Sunil Babu Shrestha
      Abstract: N/A
      PubDate: 2022-04-03
      Issue No: Vol. 20, No. 1 (2022)
       
  • Some Fixed Point Results for Two Pairs of Mappings on Integral and
           Rational Settings

    • Authors: Dinesh Panthi
      Pages: 1 - 10
      Abstract:  In 2000, P. Hitzler and A.K. Seda (Hitzeler & Seda 2000) obtained a very important generalization of topology which they named as dislocated topology. The corresponding generalized notion of metric obtained from dislocated topology was named as dislocated metric.The fixed point theorem for a single map satisfying contractive condition of integral type with a summable Lebesgue integrable mapping in complete metric space was first time estabished by Branciari (Branciari 2002) in the year 2002. B. E. Rhoades (Rhoades2003) further extended the theorem of Branciari (Branciari2002) with a most general contractive condition. Extensions and generalizations for rational and integral type mapping in various spaces can be seen in the literature of fixed point theory. This article establishes some common fixed point results satisfying integral and rational type contractive conditions with common limit range property for two pairs of maps in dislocated metric space. We have established common fixed point result in dislocated metric space with compatible and reciprocal continuity of mappings.
      PubDate: 2022-04-03
      Issue No: Vol. 20, No. 1 (2022)
       
  • Electrochemical Characterization of Electrodeposited Ni-titanium Dioxide
           Deposits on Copper and their Corrosion Study

    • Authors: Khadidja BERARMA, Amina RAGHDI, Ghania BENAICHE
      Pages: 11 - 19
      Abstract: This work aimed to produce and characterize composite coatings of nickel incorporating TiO2 nanoparticles on a copper substrate. These deposits were obtained from watts bath. In the study, the cyclic voltammetry technique was employed to provide a better understanding of the cathodic behavior of nickel deposition. The effects of the potential scanning rate and the effect of cathodic limits on cyclic voltammograms deposition of Ni in Primitive Watts Bath (BWP) were determined. The composite coatings of nickel incorporating TiO2 nanoparticles were characterized using various electrochemical techniques such as open circuit potential (OCP) and potentiodynamic polarization measurements, and electrochemical impedance spectroscopic methods. The current density values for the Ni-TiO2 in the case of 5 g/L and 10 g/L of TiO2 determined from the polarization curves recorded in 3.5% NaCl indicate that the corrosion process on nickel incorporating the TiO2 nanoparticle composite surface is slower than on pure nickel. The TiO2 particles embedded in the electroplated nickel, increase the polarization resistance and decrease the corrosion rates as compared with electrodeposited pure nickel. Electrochemical impedance spectra obtained at the open-circuit potential ( OCP) in 3.5% NaCl showed an increase of polarization resistance with time in all cases.
      PubDate: 2022-04-03
      Issue No: Vol. 20, No. 1 (2022)
       
  • Effect of different planting time and varieties on Growth and Yield of
           African Marigold (Tagetes erecta) in the Kavre district, Nepal

    • Authors: Mira Dhakal, Amar Bahadur Pun, Shandesh Bhattarai
      Pages: 20 - 28
      Abstract: A field experiment was conducted to study the effect of different planting time on growth and flowering attributes of different varieties of African marigold at Kavre district of Nepal during the year of 2014 to 2017. The experiment consisted of four replications and was laid out in a two factorial RCB design. Six treatment combinations consisting of two open pollinated varieties of marigold viz. Calcattia Orange and Calcattia Yellow and three planting time viz. 1st January 2015, 15th February 2015 and 30th March 2015 were evaluated. The pooled analysis of two years’ data showed a significant influence of varieties and planting dates on vegetative growth and flower yield and yield attributing characters Flowering duration differed significantly with variety and its interaction with date of planting. Longer duration of flowering was observed by Calcattia Orange (57.58 days) followed by Calcattia Yellow (53.50 days). 1st January planting of Calcattia Orange exhibited significantly the longest flowering duration (62.00 Days). The flower yield per plant was the highest in Calcattia Orange (894.3 gm/plant) than Calcattia Yellow (815.3 gm/plant). Similarly, 1st January planting had the highest flower yield/plant (1033.1 g/plant) followed by 15th February planting (854.9 gm/plant) and 30th March planting (676.4 g/plant). Although not significant, Calcattia Orange planted on 1st January showed better results in terms of Flower yield /plant (1081 g), Number of flowers per plant and flower size as compared to other treatment combinations and significantly the highest duration of flowering (62.00 days) along with attractive orange color under Kavre condition.
      PubDate: 2022-04-03
      Issue No: Vol. 20, No. 1 (2022)
       
  • Transit of Sun Across Constellation Sagittarius and Variation of Secondary
           Gamma Radiation Flux in January, 2021 at Udaipur, India

    • Authors: Prajesh Purohit, Devendra Pareek
      Pages: 29 - 34
      Abstract: We experimentally observed the variation of secondary gamma radiation flux (SGR) at Udaipur (270 43’ 12.00” N, 750 28’ 48.01” E), Rajasthan, India during transit of Sun across constellation Sagittarius in month of January, 2021.In this experimental study we used ground based NaI (Tl) Scintillation detector. Cadences of data were collected at interval of half an hour. The data files were stored in computer for half hour duration around time 17.00 IST to 17.30 IST on January 8, 9, 11, 13, 14, 17 and 18. The objective in this study is to observe secondary gamma radiation flux during transit of the Sun across the constellation Sagittarius. Analyzed data reveal significant variation of secondary gamma radiation flux (SGR). We interpret such variation of SGR flux counts on the basis of combine gravitational lensing effect due to Sun and Sagittarius constellation on background radiation, gravitational pull effect by constellation and sun on background radiation and radiation from constellation Sagittarius.
      PubDate: 2022-04-03
      Issue No: Vol. 20, No. 1 (2022)
       
  • Biobriquetting Experience of Nepal and Nepal Academy of Science and
           Technology (NAST)

    • Authors: Ramesh Man Singh
      Pages: 35 - 50
      Abstract: Animal dung briquettes are widely used in rural Nepal as they are cheap, easy to make and based on local materials. But their combustion and use, have negative impact on the health of women and children. Likewise, fuelwood is also still widely used for cooking and heating, causing adverse impact on forest conservation, environment and climate change. Search for alternatives to dung and fuelwood is a continuous process andfuel briquettes based on agro-forest waste is an attractive option. NAST, since its inception in 1982, has been continuously working in this area, introducing different technologies through many projects. It extended R&D and financial support to different individuals and industries working on biobriquetting. It was able to establish a biomass laboratory and Briquette Training Centre with workshop facilities to extend R&D and pedagogic support to university, college students and private sector. Many trainings were conducted under the Biovillage program and different projects. NAST even deputed its staff as JICA expert on biomass briquetting, brought teachers and engineers from Rwanda to be trained in NAST briquette training center. Many projects on briquetting were accomplished making NAST a credible institution in the area of biobriquetting
      PubDate: 2022-04-03
      Issue No: Vol. 20, No. 1 (2022)
       
  • Simulation of Stage-structured population growth of Myzus persicae
           (Suzler) (Hemiptera: Aphididade) based on age-stage, two sex life table

    • Authors: Sabitri Baral, Resham Bahadur Thapa, Ratna Kumar Jha, Samudra Lal Joshi, Sunil Aryal
      Pages: 51 - 60
      Abstract: The age-stage specific growth rate and fecundity of Myzus persicae obtained from an age-stage, two-sex life table analysis were used to simulate the growth of stage-structured population under two scenario of initial population structure for five temperature regimes. The first scenario was started with a newly born nymph and the second scenario was started with the youngest female. In both scenario, the population growth increased with shorter life cycle in the respective order: 17°C < 20°C < 23°C < 26°C < 29°C. In this study, computer simulation based on the agestage, two sex life table demonstrate it’s advantages for revealing stage-structured population growth. Information on the growth of a stage-structured population is critical for deciding the timing of intervention in integrated pest management approach.
      PubDate: 2022-04-03
      Issue No: Vol. 20, No. 1 (2022)
       
  • Impact of the leaf-feeding beetle Zygogramma bicolorata Pallister on the
           growth of Parthenium hysterophorus L. in climatically different locations
           of Nepal

    • Authors: Seerjana Maharjan, Bharat Babu Shrestha, Anjana Devktoa, Prakash Chandra Aryal, Muniappan Rangaswam, Pramod Kumar Jha
      Pages: 61 - 72
      Abstract: The leaf-feeding beetle, Zygogramma bicolorata Pallister, one of the biocontrol agents against Parthenium hysterophorus L., having been established at several locations of Nepal. However, the damage to P. hysterophorus by the beetle has not been assessed quantitatively under different climatic conditions so far. The study was carried out at two locations, namely Hetauda with a tropical climate (540 m asl) and Kathmandu with a subtropical climate (1300 m asl) to evaluate the impact of the beetle on P. hysterophorus. Beetles were released in two different densities (one and two beetles/plant) during the early flowering period (early August). Individual plants were harvested when the initial signs of senescence were observed in mid-September. Plant height and leaf, stem, root biomass of each harvested individual was measured. Plant height, leaf biomass, and stem biomass were significantly higher at the subtropical site than at tropical sites and declined with the increasing density of beetle at both locations. Root:shoot ratio increased with the increasing density of beetle at both locations. The plant height, leaf biomass, and shoot biomass decreased up to 35 %, 73 %, and 54 % respectively at the tropical site and 9 %, 58 %, and 26 % respectively at the subtropical site. Root:shoot ratio increased by 76 % in the tropical site and 30 % in the subtropical site. The present study, therefore, suggests that mass-rearing and releasing of the beetle could be an effective management tool for the biological control of P. hysterophorus in tropical and subtropical climates of Nepal.
      PubDate: 2022-04-03
      Issue No: Vol. 20, No. 1 (2022)
       
  • Evaluation of Zucchini (Cucurbita pepo L.) Genotypes for Spring Season
           Production in the Mid–Hills of Nepal

    • Authors: SurendraLal Shrestha, Mira Dhakal, Sangeeta Sapkota, Ishwori Prasad Gautam, Suprabha Pandey, Yadav Shrestha
      Pages: 73 - 81
      Abstract: Zucchini (Cucurbita pepo L.) is one of the most popular and demanded vegetable in Nepal. Seedlings of seven genotypes of squash gourd; Super Squash Ball, Squash Long, Squash Light, Squash Green Ball, Squash Green House Sondo V (check) and Grey Zucchini (check) were transplanted on second week of March in two consecutive years; 2016 and 2017 in field condition at Khumaltar with a spacing of 90 x 90 cm in four replications. The standard recommended dose of fertilizers (240:180:60 NPK kg/ha + 15 ton FYM/ha) and minimum pesticide and fungicide was applied. The main objective of this experiment was to find out suitable high yielding and insect pest and disease tolerant hybrid Zucchini cultivars for commercial production in mid-hills of Nepal. Crops were evaluated for their vegetative, insect pest and disease, and yield attributing parameters. Among the tested genotypes; Squash Long was found highly uniform, vigorous, least virus and insect damage, significantly higher number of fruits(8.6), and yield (3894 g) per plant and yield (46.89 t/ha) followed by Super Squash Ball having highly uniform, less insect and powdery mildew damage, significantly higher number of fruits (8.5) and yield (2565 g) per plant and yield (29.28 t/ha) as compared to check Sondo V and Grey Zucchini where Sondo V had yield (22.50 t/ha and 1703 g/plant), number of fruits (5.6), per plant respectively. Squash Long and Super Squash Ball have been selected and recommended for cultivation during spring season in mid-hills of Nepal.
      PubDate: 2022-04-03
      Issue No: Vol. 20, No. 1 (2022)
       
  • Comparison of Relative Flux Density of Procyon in Visible Band

    • Authors: Bimal Subedi, Sameer Nepal, Ocean Shrestha
      Pages: 82 - 90
      Abstract: We present the photometric analysis of Procyon in FITS format using Aladin 9.0 by studying the luminous flux collected by a 16 inch Meade LX200GPS Schmidt-Cassegrain telescope placed at B.P. Koirala National Observa¬tory, Nagarkot, Nepal on April 18, 2017. The maximum and minimum diameters along the maximum and minimum flux regions are constructed. A graph is plotted using a Python custom program for the relative flux density along the two diameters. The flux density varies from the region of extremities of the diameters constructed from 0.25 to a peak of 248.50 in the relative unit. A significant bulging towards the north-eastern portion of Procyon is observed. While moving from the region of maximum flux towards the edge of the north-eastern section, we noticed the bulge prominently. The south-western portion and the other two directions do not show much variation. A possible explanation of the result is discussed.
      PubDate: 2022-04-03
      Issue No: Vol. 20, No. 1 (2022)
       
  • Detection of Common β-Globin Gene Mutation in Eastern Nepal by Multiplex
           

    • Authors: Gita Shrestha, Nanda Bahadur Singh, Priti Shrestha, Chitra Baniya
      Pages: 91 - 98
      Abstract: β-thalassemia is the most common autosomal recessive haemoglobin disorder worldwide. Although more than 200 β-thalassemia mutations have been reported, few ethnic group-specific alleles account for 90-93% of the β-thalassemia alleles in each population. The primary purpose of the study was to identify the prevalence of different types of beta-thalassemia mutations in the study group, and to establish a genotype-phenotype correlation. Complete blood count, peripheral blood smeacr, capillary electrophoresis and multiples arms refractory mutation system based polymerase chain reaction (MARMS) were performed on the peripheral blood samples to detect beta mutations at Decode Genomics and Research Centre, Sinamangal Kathmandu. The MARMS-PCR technique was applied for the detection of nine common mutationsIVS1- 5(G>C), 619 bp del, FS8/9 (+G), IVS1-1 (G>T), FS 41/42 (-CTTT), C-15 (G>A). FS 16 (-C), C-30 (G>C) and C-5 (-CTCT). In the study group, three mutations, C-15(G>A), C-26 (Glu-Lys) and IVS1-5 (G>C) were detected. The study revealed a characteristic mutational profile in the five ethnic groups of eastern Nepal. It is the first report of HbE in the Koch Rajbanshi of eastern Nepal. The mutation C-15 reported as rare by earlier workers was the most common mutation identified in this research work.
      PubDate: 2022-04-03
      Issue No: Vol. 20, No. 1 (2022)
       
  • Euphorbia hirta L. a new host record of Oidium species from Nepal.

    • Authors: Mahesh Kumar Adhikari
      Pages: 99 - 103
      Abstract: Euphorbia hirta L. which was found parasitized by the Oidium species (imperfect stage of Erysiphales), on the leaves, is considered as a new host record for the fungus. It was collected in the promises of Nepal Academy of Science and Technology (NAST), Khumaltar, Nepal The description of the fungus and distribution is provided here with.
      PubDate: 2022-04-03
      Issue No: Vol. 20, No. 1 (2022)
       
  • Study of Impact of Meteorological Parameters on Atmospheric Transmittance
           of Solar Radiation over Jumla

    • Authors: Prakash M. Shrestha, Narayan P. Chapagain, Indra B. Karki, Khem N. Poudyal
      Pages: 104 - 112
      Abstract: This paper reports the variation of atmospheric transmittance with meteorological parameters over Jumla (Lat.29.28o N, Long.:82.16o E and Alt.: 2300 m above sea level) from2011 to 2013(three years) by using CMP6 pyranometer and satellite data. The trends of monthly and seasonal variations of atmospheric transmittance, solar insolation and clearness index have been analyzed. The result exemplifies that during the study period, average value of global solar radiation, solar insolation and clearness index are 19.26 ±3.88 MJ/m2/day , 4.95 ± 1.14 kWh/m2/day and 0.59 ±0.12 respectively. The average value of atmospheric transmittance during the whole study period is 0.60 ± 0.11. The average value of atmospheric transmittance of ozone , Rayleigh scattering, gas mixture ,water vapor and aerosol are 0.9830 ±0.0007, 0.8999 ±0.0178, 0.9875 ± 0.0007, 0.8839 ±0.0101 and 0.7836 ±0.0909 respectively. There is positive correlation of relative sunshine hour and negative correlation of rain fall with atmospheric transmittance. Result of this research work is beneficial for the further analysis of solar radiation at different places improving life of flora and fauna and protecting the whole environment.
      PubDate: 2022-04-03
      Issue No: Vol. 20, No. 1 (2022)
       
  • Nutritional value and antioxidant properties of Diospyros malabarica
           (Desr.) Kostel., fruit from midhills of western Nepal

    • Authors: Rachana Shrestha, Prabin Dawadi, Santoshi Bhusal, Lok Ranjan Bhatt
      Pages: 113 - 125
      Abstract: Fruit consumption has long been recognized for its beneficial impact on human health. Persimmon fruit (Diospyros malabarica (Desr.) Kostel.) is a popular wild edible fruit distributed in mid-hill regions of Western Nepal and is used in treatment of various ailments by local people. Although, persimmon is a popular fruit, its significant nutritive values and bioactive compounds are still unexplored in Nepal. This research on nutritional and phytochemical analysis of persimmon fruit pulp was carried out using standardized analytical methods (Association of Official Analytical Chemists, AOAC) and microplate spectrophotometry with ultraviolet (UV) detection. The results revealed that the fruit is rich in sugar (66.52±2.17 mg /g), fiber (103.95 mg/g), ash (107.44 mg/g) and total phenolic content (112±2.89 mg GAEs/g) and the mild supplier of antioxidants.
      PubDate: 2022-04-03
      DOI: 10.3126/njst.v20i1.43361
      Issue No: Vol. 20, No. 1 (2022)
       
  • Phytochemical Screening, Antioxidant and Antidiabetic Activities of
           Extracts of Leaves and Seeds of Carica papaya

    • Authors: Shanta Pokhrel, Puja Karki
      Pages: 126 - 135
      Abstract: The phytochemicals, phenolic, flavonoid contents, and antibacterial, antioxidant and antidiabetic activities of leaves and seeds extract of Carica papaya via Soxhlet extraction were investigated. The phytochemical screening indicated different bioactive compounds such as saponins, alkaloids, glycosides, tannins, polyphenols, steroids, and flavonoids in different extracts. The total phenolic content (TPC) was determined spectrophotometrically by Folin–Ciocalteu reagent method and aluminium chloride reagent to measure total flavonoid content (TFC). TPC was found more in leaf methanol extract (LME) (93.18±0.40 mg GAE/g) than that in seed methanol extract (SME) (89.14±0.45 mg GAE/g). Comparatively, the flavonoid content was found more in LME (18.85±0.061 mgQE/g) than in SME (16.64±0.065 mgQE/g). The antioxidant activity was assessed for LME and SME by DPPH radical scavenging activity and IC50 values. The IC50 values of LME and SME were 43.54±0.007 and 15.48±0.13µg/mL, respectively. Thus, seeds methanol extract showed better antioxidant activity than leaves methanol extract. The antidiabetic assay was performed via α- amylase inhibition method. Among the selected parts (seeds and leaves), methanol seed extract exhibited high α-amylase inhibition with an IC50 value of 46.99±0.018 µg/mL. The study explored the potential value of Carica papaya in medicinal applications.
      PubDate: 2022-04-03
      DOI: 10.3126/njst.v20i1.43362
      Issue No: Vol. 20, No. 1 (2022)
       
  • Comparative Studies on Antioxidant Activity of Ten Medicinal Plants
           Collected From the Ilam District of Nepal

    • Authors: Surya Kant Kalauni, Muna Niraula, Prakash Thapa, Ishwor Pathak
      Pages: 136 - 145
      Abstract: Methanol extracts of ten medicinal plants collected from Ilam district were prepared and a preliminary phytochemical screening was performed. Phytochemical test revealed that selected plant samples contain alkaloids, flavonoids, terpenoids, glycosides, quinones, reducing sugars, coumarin, polyphenols, and saponins. The antioxidant properties of ten samples were evaluated by using DPPH free radical scavenging assay and their inhibitory concentration for 50% inhibition (IC50 values) for antioxidant properties were calculated. Among all ten studied samples, IC50 values of extracts of barks of Atrocarpus lakoocha (41.42±3.1 µg/mL) and flowers of Woodfordia fructicosa (41.89±2.5 µg/ mL) were very close to that of standard ascorbic acid (38.74±2.5 µg/mL). Similarly, flowers of Rhododendron arboreum (45.55±2.2 µg/mL), roots of Vetiveria zizanoids (46.22±2.0 µg/mL) and rhizomes of Mirabilis jalapa (48.99±3.0 µg/mL) also showed strong activity against DPPH free radicals. These results showed that these plants could be the potential sources of natural antioxidants in the food and/or pharmaceutical industry
      PubDate: 2022-04-03
      DOI: 10.3126/njst.v20i1.43363
      Issue No: Vol. 20, No. 1 (2022)
       
 
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