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Soil organic carbon and phosphorus availability regulate abundance of culturable phosphate-solubilizing bacteria in paddy fields

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Pedosphere 2020年第3期30卷 405-413页

作者： Arvind KUMAR lal chand rai Molecular Biology Section Laboratory of Algal BiologyCenter of Advanced Study in BotanyBanaras Hindu UniversityVaranasi 221005India Department of Biotechnology Guru Ghasidas VishwavidyalayaBilaspur 495009India

Low availability of phosphorus(P) is a major constraint for optimal crop production, as P is mostly present in its insoluble form in soil. Therefore,phosphate-solubilizing bacteria(PSB) from paddy field soils of the Indo-Gangetic Plain, India were isolated, and their abundance was attempted to be correlated with the physicochemical characteristics of the soils. Ninety-four PSB were isolated on Pikovskaya’s agar medium, and quantitative phosphate solubilization was evaluated using NBRIP medium. The isolates solubilized P up to a concentration of 1 006 μg mL-1 from tricalcium phosphate with the secretion of organic acids. These isolates were identified by 16 S rRNA gene sequence comparison, and they belonged to Gammaproteobacteria(56 isolates),Firmicutes(28 isolates), Actinobacteria(8 isolates), and Alphaproteobacteria(2 isolates). Phylogenetic analysis confirmed the identification by clustering the isolates in the clade of the respective reference organisms. The correlation analysis between PSB abundance and physicochemical characteristics revealed that the PSB population increased with increasing levels of soil organic carbon, insoluble P, K+, and Mg2+. The promising PSB explored in this study can be further evaluated for their biofertilizer potential in the field and for their use as potent bio-inoculants.

关键词： bacterial abundance insoluble P organic acids phosphate solubilization phylogenetic analysis 16S rRNA gene

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Comprehensive investigation of structural,dielectric and local piezoelectric properties of KNN ceramics

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Journal of Advanced Dielectrics 2019年第2期9卷 33-44页

作者： Poonam Kumari Madan lal Sunil Kumar Radheshyam rai Anupinder Singh D.V.Karpinsky Igor Bdikin Department of Physics ACBS Eternal UniversityBaru Sahib 173101 Himachal PradeshIndia Department of Physics Guru Nanak Dev University Amritsar 143005India Scientific-Practical Materials Research Centre of NAS of Belarus Minsk 220072 BelarusIndia National Research University of Electronic Technology“MIET”Zelenograd 124498 MoscowRussia TEMA-NRD Mechanical Engineering Department and Aveiro Institute of Nanotechnology(AIN)University of AveiroAveiro 3810-193Portugal

In this research paper,we utilized the traditional high-temperature solid-state reaction method to fabricate the K_(0.495)Na_(0.520)NbO_(3),K_(0.480)Na_(0.535)NbO_(3)and K_(0.475)Na_(0.540)NbO_(3)(abbreviated as KNN-1,KNN-2,and KNN-3,respectively)lead-free ion deficient ceramics for understanding the influence of ionic deficiency on the crystalline structure and dielectric/piezoelectric properties of the samples.X-ray diffraction patterns of these samples exhibited a perovskite tetragonal *** anomalies around 287℃and 471℃were identified as ferroelectric to ferroelectric and ferroelectric to paraelectric-transition temperatures for KNN-2 at 1 *** was found that the composition KNN-2 exhibit relatively high Curie temperature i.e.,471℃.The conductivity plots confirm that the activation energies are *** impedance behavior in our ceramic samples can be analyzed with the bulk/grain *** slope of Z′with temperature shows negative temperature coefficient of resistance(NTCR)type behavior in proposed KNN ceramics material.

关键词： KNN dielectric properties X-ray diffraction(XRD) NTCR PFM

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Rapid metabolic fingerprinting with the aid of chemometric models to identify authenticity of natural medicines: Turmeric, Ocimum, and Withania somnifera study

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Journal of Pharmaceutical Analysis 2023年第9期13卷 1041-1057页

作者： Samreen Khan Abhishek Kumar rai Anjali Singh Saudan Singh Basant Kumar Dubey Raj Kishori lal Arvind Singh Negi Nicholas Birse Prabodh Kumar Trivedi Christopher T.Elliott Ratnasekhar Ch Metabolomics Lab Council of Scientific and Industrial Research(CSIR)-Central Institute of Medicinal and Aromatic Plants(CIMAP)Lucknow226015India Department of Crop Production&Protection Council of Scientific and Industrial Research(CSIR)-Central Institute of Medicinal and Aromatic Plants(CIMAP)Lucknow226015India Academy of Council of Scientific and Industrial Research(ACSIR) Ghaziabad201002India Department of Biotechnology Council of Scientific and Industrial Research(CSIR)-Central Institute of Medicinal and Aromatic Plants(CIMAP)Lucknow226015India Genetics and Plant Breeding Department Council of Scientific and Industrial Research(CSIR)-Central Institute of Medicinal and Aromatic Plants(CIMAP)Lucknow226015India Department of Phytochemistry Council of Scientific and Industrial Research(CSIR)-Central Institute of Medicinal and Aromatic Plants(CIMAP)Lucknow226015India School of Biological Sciences Queen's UniversityBelfastBT95DLUK

Herbal medicines are popular natural medicines that have been used for *** use of alternative medicines continues to expand rapidly across the *** World Health Organization suggests that quality assessment of natural medicines is essential for any therapeutic or health care applications,as their therapeutic potential varies between different geographic origins,plant species,and *** of herbal medicines based on a limited number of secondary metabolites is not an ideal *** quality should be considered based on a complete metabolic profile,as their pharmacological activity is not due to a few specific secondary metabolites but rather a larger group of bioactive compounds.A holistic and integrative approach using rapid and nondestructive analytical strategies for the screening of herbal medicines is required for robust *** this study,a rapid and effective quality assessment system for geographical traceability,species,and variety-specific authenticity of the widely used natural medicines turmeric,Ocimum,and Withania somnifera was investigated using Fourier transform near-infrared(FT-NIR)spectroscopy-based metabolic *** different geographical origins of turmeric,five different Ocimum species,and three different varieties of roots and leaves of Withania somnifera were studied with the aid of machine learning *** good discrimination(R^(2)>0.98,Q^(2)>0.97,and accuracy=1.0)with sensitivity and specificity of 100%was achieved using this metabolic fingerprinting *** study demonstrated that FT-NIR-based rapid metabolic fingerprinting can be used as a robust analytical method to authenticate several important medicinal herbs.

关键词： Rapid metabolic fingerprinting Natural medicines FT-NIR Chemometric models

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尼泊尔柯西河流域土地利用/覆被变化影响下的土壤流失量与输沙量的动态变化

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Journal of Geographical Sciences 2023年第6期33卷 1287-1312页

作者：依格兹·比雷纳熊东红张宝军贝勒特·马耶查理斯·德夫拉杰奇迪·奇哈比·拉尔古瓦迪尔·阿沃克吴艳宏莱·迪尔·库玛尔 Institute of Mountain Hazards and Environment CASChengdu 610041China University of Chinese Academy of Sciences Beijing 100049China Branch of Sustainable Mountain Development Kathmandu Center for Research and EducationCAS-TUKathmandu 44613Nepal Department of Natural Resource Management Debre Tabor UniversityDebre Tabor 272Ethiopia Mackay Area Productivity Services 26135 Peak Downs HighwayTe Kowai QLD 4740Australia Central Department of Geography Tribhuvan UniversityKathmanduNepal Department of Biology College of Natural SciencesArba Minch UniversityArba Minch 21Ethiopia

How the dynamics in soil loss(SL) and sedimentation are affected by land use/cover change(LULCC) has long been one of the most important issues in watershed management worldwide, especially in fragile mountainous river basins. This study aimed to investigate the impact of LULCC on SL and sediment export(SE) in eastern regions of the Koshi River basin(KRB), Nepal, from 1990 to 2021. The Random Forest classifier in the Google Earth Engine platform was employed for land use/land cover(LULC) classification, and the Integrated Valuation Ecosystem Services and Trade-offs(InVEST) Sediment Delivery Ratio model was used for SL and SE modeling. The results showed that there was a pronounced increase in forest land(4.12%), grassland(2.35%), and shrubland(3.68%) at the expense of agricultural land(10.32%) in KRB over the last three decades. Thus, the mean SL and SE rates decreased by 48% and 60%, respectively, from 1990 to 2021. The conversion of farmland to vegetated lands has greatly contributed to the decrease in SL and SE rates. Furthermore, the rates of SL and SE showed considerable spatiotemporal variations under different LULC types, topographic factors(slope aspect and gradient), and sub-watersheds. The higher rates of SL and SE in the study area were observed mostly in slope gradient classes between 8° and 35°(accounting for 83%–91%) and sunny and semi-sunny slope aspects(SE, S, E, and SW)(accounting for 57%–65%). Although the general mean rate of SL presented a decreasing trend in the study area, the current mean SL rate(23.33 t ha^(-1)yr^(-1)) in 2021 is still far beyond the tolerable SL rate of both the global(10 Mg ha^(-1)yr^(-1)) and the Himalayan region(15 t ha^(-1)yr^(-1)). Therefore, landscape restoration measures should be integrated with other watershed management strategies and upscaled to hotspot areas to regulate basin sediment flux and secure ecosystem service sustainability.

关键词： soil loss sediment export land use/cover InVEST model Koshi River basin Google Earth Engine

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