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Potential impact of climate change on plant invasion in the Republic of Korea
Adhikari, Pradeep,Jeon, Ja-Young,Kim, Hyun Woo,Shin, Man-Seok,Adhikari, Prabhat,Seo, Changwan The Ecological Society of Korea 2019 Journal of Ecology and Environment Vol.43 No.4
Background: Invasive plant species are considered a major threat to biodiversity, ecosystem functioning, and human wellbeing worldwide. Climatically suitable ranges for invasive plant species are expected to expand due to future climate change. The identification of current invasions and potential range expansion of invasive plant species is required to plan for the management of these species. Here, we predicted climatically suitable habitats for 11 invasive plant species and calculated the potential species richness and their range expansions in different provinces of the Republic of Korea (ROK) under current and future climate change scenarios (RCP 4.5 and RCP 8.5) using the maximum entropy (MaxEnt) modeling approach. Results: Based on the model predictions, areas of climatically suitable habitats for 90.9% of the invasive plant species are expected to retain current ecological niches and expand to include additional climatically suitable areas under future climate change scenarios. Species richness is predicted to be relatively high in the provinces of the western and southern regions (e.g., Jeollanam, Jeollabuk, and Chungcheongnam) under current climatic conditions. However, under future climates, richness in the provinces of the northern, eastern, and southeastern regions (e.g., Seoul, Incheon, Gyeonggi, Gyeongsangnam, Degue, Busan, and Ulsan) is estimated to increase up to 292%, 390.75%, and 468.06% by 2030, 2050, and 2080, respectively, compared with the current richness. Conclusions: Our study revealed that the rates of introduction and dispersion of invasive plant species from the western and southern coasts are relatively high and are expanding across the ROK through different modes of dispersion. The negative impacts on biodiversity, ecosystem dynamics, and economy caused by invasive plant species will be high if preventive and eradication measures are not employed immediately. Thus, this study will be helpful to policymakers for the management of invasive plant species and the conservation of biodiversity.
Background study of NaI(Tl) crystals for the KIMS-NaI experiment
Adhikari, P,Adhikari, G,Choi, S,Ha, C,Hahn, I S,Jeon, EJ,Joo, H W,Kang, W G,Kim, H J,Kim, H O,Kim, K W,Kim, N Y,Kim, S K,Kim, Y D,Kim, Y H,Lee, H S,Lee, J H,Lee, M H,Leonard, D S,Li, J,Oh, S Y,Olsen, Institute of Physics Publishing Ltd 2016 Journal of Physics: Conference Series Vol.718 No.-
Search for a Dark Matter-Induced Annual Modulation Signal in NaI(Tl) with the COSINE-100 Experiment
Adhikari, G.,Adhikari, P.,de Souza, E. Barbosa,Carlin, N.,Choi, S.,Djamal, M.,Ezeribe, A. C.,Ha, C.,Hahn, I. S.,Jeon, E. J.,Jo, J. H.,Joo, H. W.,Kang, W. G.,Kang, W.,Kauer, M.,Kim, G. S.,Kim, H.,Kim, American Physical Society 2019 Physical Review Letters Vol.123 No.3
Initial performance of the COSINE-100 experiment
Adhikari, G.,Adhikari, P.,de Souza, E. Barbosa,Carlin, N.,Choi, S.,Choi, W. Q.,Djamal, M.,Ezeribe, A. C.,Ha, C.,Hahn, I. S.,Hubbard, A. J. F.,Jeon, E. J.,Jo, J. H.,Joo, H. W.,Kang, W. G.,Kang, W.,Kaue Springer-Verlag 2018 European Physical Journal C Vol.78 No.2
Understanding NaI(Tl) crystal background for dark matter searches
Adhikari, G.,Adhikari, P.,Ha, C.,Jeon, E. J.,Kim, N. Y.,Kim, Y. D.,Kong, S. Y.,Lee, H. S.,Oh, S. Y.,Park, J. S.,Park, K. S. Springer-Verlag 2017 The European physical journal. C, Particles and fi Vol.77 No.7
<P>We have developed ultra-low-background NaI(Tl) crystals to reproduce the DAMA results with the ultimate goal of achieving purity levels that are comparable to or better than those of the DAMA/LIBRA crystals. Even though the achieved background level does not approach that of DAMA/LIBRA, it is crucial to have a quantitative understanding of the backgrounds. We have studied background simulations toward a deeper understanding of the backgrounds and developed background models for a 9.16-kg NaI(Tl) crystal used in the test arrangement. In this paper we describe the contributions of background sources quantitatively by performing Geant4 Monte Carlo simulations that are fitted to the measured data to quantify the unknown fractions of the background compositions. In the fitted results, the overall simulated background spectrum well describes the measured data with a 9.16-kg NaI(Tl) crystal and shows that the background sources are dominated by surface Pb-210 and internal K-40 in the 2-6-keV energy interval, which produce 2.4 counts/day/keV/kg (dru) and 0.5 dru, respectively.</P>
Background model for the NaI(Tl) crystals in COSINE-100
Adhikari, P.,Adhikari, G.,Souza, E. Barbosa de,Carlin, N.,Choi, S.,Choi, W. Q.,Djamal, M.,Ezeribe, A. C.,Ha, C.,Hahn, I. S.,Hubbard, A. J. F.,Jeon, E. J.,Jo, J. H.,Joo, H. W.,Kang, W. G.,Kauer, M.,Kan Springer Berlin Heidelberg 2018 European Physical Journal C Vol.78 No.6
<P>The COSINE-100 dark matter search experiment is an array of NaI(Tl) crystal detectors located in the Yangyang Underground Laboratory (Y2L). To understand measured backgrounds in the NaI(Tl) crystals we have performed Monte Carlo simulations using the Geant4 toolkit and developed background models for each crystal that consider contributions from both internal and external sources, including cosmogenic nuclides. The background models are based on comparisons of measurement data with Monte Carlo simulations that are guided by a campaign of material assays and are used to evaluate backgrounds and identify their sources. The average background level for the six crystals (70 kg total mass) that are studied is 3.5 counts/day/keV/kg in the (2–6) keV energy interval. The dominant contributors in this energy region are found to be [FORMULA OMISSION]Pb and [FORMULA OMISSION]H.</P>
Bishnu Adhikari,Sanjeev Kumar Dhungana,Muhammad Waqas Ali,Arjun Adhikari,김일두,신동현 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.5
Peanut sprouts are gaining increasing popularity as a potential source of functional food. The objective of this study was to investigate yield and food value of peanut sprouts of six Korean peanut genotypes (Daekwang, Akwang, Baekjung, Alogi, Pungan and Heugttangkong) from day 5 through 9. Functional compounds like polyphenol, flavonoid, and resveratrol contents were significantly (p\0.05) high in the sprouts compared to those in the seeds. Pungan yielded significantly (p\0.05) high sprouts followed by Alogi. However, antioxidant potentials and functional compounds in the sprouts varied significantly (p\0.05) with genotype, sprout part, and day after germination. Overall consideration of the yield, functional compounds, and antioxidant potentials of the sprouts suggested that more appropriate time of sprout harvest for Alogi and Pungan was day 5–7 and that for the other genotypes was day 5–8. The yield and functional properties of peanut sprouts significantly varied with genotypes, parts, and age.
Arjun Adhikari,이고은,Muhammad Aaqil Khan,강상모,Bishnu Adhikari,Muhammad Imran,JANRAHMATULLAH,김경민,이인중 한국미생물·생명공학회 2020 Journal of microbiology and biotechnology Vol.30 No.1
Silicon and phosphorus are elements that are beneficial for plant growth. Despite the abundant availability of silicate and phosphate in the Earth’s crust, crop nutritional requirements for silicon and phosphorus are normally met through the application of fertilizer. However, fertilizers are one of the major causes of heavy metal pollution. In our study, we aimed to assess silicate and phosphate solubilization by the bacteria Enterobacter ludwigii GAK2, in the presence and absence of phosphate [Ca3(PO4)2] or silicate (Mg2O8Si3), to counteract cadmium stress in rice (Oryza sativa L). Our results showed that the GAK2-treated rice plants, grown in soil amended with phosphate [Ca3(PO4)2] or silicate (Mg2O8Si3), had significantly reduced cadmium content, and enhanced plant growth promoting characteristics including fresh shoot and root weight, plant height, and chlorophyll content. These plants showed significant downregulation of the cadmium transporter gene, OsHMA2, and upregulation of the silicon carrier gene, OsLsi1. Moreover, jasmonic acid levels were significantly reduced in the GAK2-inoculated plants, and this was further supported by the downregulation of the jasmonic acid related gene, OsJAZ1. These results indicate that Enterobacter ludwigii GAK2 can be used as a silicon and phosphorus bio-fertilizer, which solubilizes insoluble silicate and phosphate, and mitigates heavy metal toxicity in crops.