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Historical variations in autochthonous and allochthonous sediment supplies to the largest freshwater lake in Central India

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International Journal of Sediment Research 2022年第5期37卷 563-575页

作者： Nafees Ahmad Satinder Pal Singh Aasif Mohmad Lone Abul Qasim Ravi Bhushan gyana ranjan tripathy Chinmay Shah Department of Earth and Environmental Sciences Indian Institute of Science Education and Research Bhopal Geosciences Division Physical Research Laboratory Department of Earth and Climate Science Indian Institute of Science Education and Research

Lacustrine sediment preserves high-resolution biogeochemical records of past variations in watershed processes controlling lake sedimentation. The current study explores historical variations in autochthonous and allochthonous sediment supplies to a large tropical freshwater lake system(Upper Lake, Bhopal) protected under the international Ramsar Convention of 2002 against anthropogenic pressures. For this purpose, multi-proxy biogeochemical data are presented for organic matter(total organic carbon, total nitrogen, phosphorous, and loss on ignition [LOI] at550°C), carbonate(LOI at 950°C), lithic sediment(aluminum, titanium, iron, calcium, magnesium,sodium, potassium, manganese, zirconium, niobium, hafnium, tantalum, thorium, uranium, and rare earth elements), and anthropogenic inputs(lead) measured in a 38 cm long sediment core retrieved from the lake. In addition to the lacustrine sediment core, the samples of catchment bedrock, surface soils, major stream sediment, and eolian dust collected from the lake periphery also are analyzed. The systematic biogeochemical excursions in the upper core section(top ～8 cm) indicate increased anthropogenic inputs, watershed denudation by agricultural activities, artificially reduced fluvial sediment supply, relatively increased dust inputs and lake eutrophication in the last few decades. The current study underscores the roles of anthropogenic land-use and wetland conservation practices in the rapid alteration of autochthonous and allochthonous sediment supplies to open aquatic ecosystems. Further, rising lake eutrophication levels despite a managed reduction in allochthonous sediment supplies seem challenging to control due to dissolved nutrient supply from urban sewage discharge and runoff from agricultural land in the watershed.

关键词： Upper Lake Sediment Geochemistry Sediment provenance Eutrophication Anthropogenic inputs

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Machine Learning-based Inverse Model for Few-Mode Fiber Designs

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Computer Systems Science & Engineering 2023年第4期45卷 311-328页

作者： Bhagyalaxmi Behera gyana ranjan Patra Shailendra Kumar Varshney Mihir Narayan Mohanty ITER Siksha‘O’Anusandhan(Deemed to be University)Bhubaneswar751030India Department of Electronics and Electrical Communication Engineering IITKharagpur721302India

The medium for next-generation communication is considered as fiber for fast,secure communication and switching capability.Mode division and space division multiplexing provide an excellent switching capability with high data transmission rate.In this work,the authors have approached an inverse modeling technique using regression-based machine learning to design a weakly coupled few-mode fiber for facilitating mode division multiplexing.The technique is adapted to predict the accurate profile parameters for the proposed few-mode fiber to obtain the maximum number of modes.It is for a three-ring-core few-mode fiber for guiding five,ten,fifteen,and twenty modes.Three types of regression models namely ordinary least-square linear multi-output regression,k-nearest neighbors of multi-output regression,and ID3 algorithm-based decision trees for multi-output regression are used for predicting the multiple profile parameters.It is observed that the ID3-based decision tree for multioutput regression is the robust,highly-accurate machine learning model for fast modeling of FMFs.The proposed fiber claims to be an efficient candidate for the next-generation 5G and 6G backhaul networks using mode division multiplexing.

关键词： Few-mode fibers inverse modeling machine learning regression ring-core

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Phylogenic Study of Twelve Species of Phyllanthus Originated from India through Molecular Markers for Conservation

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American Journal of Plant Sciences 2010年第1期1卷 32-37页

作者： gyana ranjan Rout Subhashree Aparajita 不详

The objective of the study was to characterize the germplasm for identification and phylogeny study for conservation. Identification and characterization of germplasm is an important link between the conservation and utilization of plant genetic resources. The present investigation was undertaken to draw the phylogenetic relationship between twelve species from India belonging to genus Phyllanthus with the help of molecular markers. In total, 259 marker loci were assessed, out of which 249 were polymorphic revealing 96.13% polymorphism. Nei’s similarity index varies from 0.23 to 0.76 for RAPD and 0.26 to 0.81 for ISSR marker systems. Cluster analysis by unweighted pair group method (UPGMA) of Dice coefficient of similarity generated dendogram with more or less similar topology for both the analysis that gave a better reflection of diversity and affinities between the species. The phylogenetic tree obtained from both RAPD and ISSR marker has divided the 12 species in two groups: group I consisting of only one species Phyllanthus angustifolius and the group II with the rest 11 species. This molecular result is comparable to notable morphological characteristics. The present study revealed the distant variation within the species of Phyllanthus. This investigation will help for identification and conservation of Phyllanthus species.

关键词： Genetic Variation ISSR Medicinal Plant RAPD

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Agromorphological and Molecular Characterization of Sesamum indicum L.—An Oil Seed Crop

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American Journal of Plant Sciences 2016年第17期7卷 2399-2411页

作者： Tapaswini Hota Chinmaya Pradhan gyana ranjan Rout Department of Agricultural Biotechnology College of Agriculture OUAT Bhubaneswar India Post Graduate Department of Botany Utkal University Bhubaneswar India

Sesamum indicum L. (family: Pedaliaceae) is an economically important oil seed crop grown in tropical and sub-tropical countries. It is widely used in food, nutraceutical, pharmaceutical industries. Sesamum is widely distributed in all the climatic stages and great diversity. The exploration of genetic diversity is a pre-requisite for genome organization in the landraces and the related domesticated ones. Agromorphological and molecular markers were used to assess the identification of 33 Sesamum genotypes and determination of the genetic relationships among these genotypes. Out of 30 Inter-Simple Sequence Repeat (ISSR) primers tested, 18 primers produced 114 detectable fragments, of which 97 (85.08%) were polymorphic across the varieties. Molecular profiling could be solely used for their identification of genotypes. Genetic relationships among these genotypes were evaluated by generating a similarity matrix based on the Jacard’s coefficient and the Unweighted Pair Group Method with Arithmetic Average (UPGMA) dendogram. The results showed a clear cut separation of the 33 genotypes and were in broad agreement with the morphology. Both molecular and morphological markers will be useful for preservation of the germplasm as well as breeding program.

关键词： Sesamum PCR Based Marker Phylogeny Molecular Profiling Agro-Mophological Traits

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