774 research outputs found
FIGURE 1. Collection sites. a in A taxonomic revision of the Indian species of the 'Aterinervis' group of Culicoides Latreille Subgenus Hoffmania Fox (Diptera: Ceratopogonidae)
No full textFIGURE 1. Collection sites. a) PHE Camp; b) malaise trap in Bhotaykhadka; c) map showing location of sampling sitesPublished as part of Sarkar, Ankita, Banerjee, Paramita, Sinha, Shuvra Kanti & Mazumdar, Abhijit, 2023, A taxonomic revision of the Indian species of the 'Aterinervis' group of Culicoides Latreille Subgenus Hoffmania Fox (Diptera: Ceratopogonidae), pp. 405-428 in Zootaxa 5258 (4) on page 406, DOI: 10.11646/zootaxa.5258.4.3, http://zenodo.org/record/778442
FIGURE 7. Culicoides quasiregalis. a in A taxonomic revision of the Indian species of the 'Aterinervis' group of Culicoides Latreille Subgenus Hoffmania Fox (Diptera: Ceratopogonidae)
No full textFIGURE 7. Culicoides quasiregalis. a) head; b) maxillary palp; c) thorax; d) fore tarsis; e) hind tibial spines; f) wing and g) spermathecae with ringPublished as part of Sarkar, Ankita, Banerjee, Paramita, Sinha, Shuvra Kanti & Mazumdar, Abhijit, 2023, A taxonomic revision of the Indian species of the 'Aterinervis' group of Culicoides Latreille Subgenus Hoffmania Fox (Diptera: Ceratopogonidae), pp. 405-428 in Zootaxa 5258 (4) on page 418, DOI: 10.11646/zootaxa.5258.4.3, http://zenodo.org/record/778442
FIGURE 5. Culicoides pararegalis. a in A taxonomic revision of the Indian species of the 'Aterinervis' group of Culicoides Latreille Subgenus Hoffmania Fox (Diptera: Ceratopogonidae)
No full textFIGURE 5. Culicoides pararegalis. a) head; b)maxillary palp; c) thorax; d) hind tarsis; e) hind tibial spines; f) wing; g) halter; h) spermathecae and i) ringPublished as part of Sarkar, Ankita, Banerjee, Paramita, Sinha, Shuvra Kanti & Mazumdar, Abhijit, 2023, A taxonomic revision of the Indian species of the 'Aterinervis' group of Culicoides Latreille Subgenus Hoffmania Fox (Diptera: Ceratopogonidae), pp. 405-428 in Zootaxa 5258 (4) on page 415, DOI: 10.11646/zootaxa.5258.4.3, http://zenodo.org/record/778442
FIGURE 2. Culicoides aterinervis. a in A taxonomic revision of the Indian species of the 'Aterinervis' group of Culicoides Latreille Subgenus Hoffmania Fox (Diptera: Ceratopogonidae)
No full textFIGURE 2. Culicoides aterinervis. a) head; b) third palpal segment; c) hind tibial spines; d) wing; e) spermatheca; f) male genitalia and g) paramerePublished as part of Sarkar, Ankita, Banerjee, Paramita, Sinha, Shuvra Kanti & Mazumdar, Abhijit, 2023, A taxonomic revision of the Indian species of the 'Aterinervis' group of Culicoides Latreille Subgenus Hoffmania Fox (Diptera: Ceratopogonidae), pp. 405-428 in Zootaxa 5258 (4) on page 409, DOI: 10.11646/zootaxa.5258.4.3, http://zenodo.org/record/778442
FIGURE 6. Culicoides pseudoregalis. a in A taxonomic revision of the Indian species of the 'Aterinervis' group of Culicoides Latreille Subgenus Hoffmania Fox (Diptera: Ceratopogonidae)
No full textFIGURE 6. Culicoides pseudoregalis. a) head; b) maxillary palp; c) thorax; d) mid tarsis; e) hind tibial spines; f) wing; g) halter and h) spermathecae with ringPublished as part of Sarkar, Ankita, Banerjee, Paramita, Sinha, Shuvra Kanti & Mazumdar, Abhijit, 2023, A taxonomic revision of the Indian species of the 'Aterinervis' group of Culicoides Latreille Subgenus Hoffmania Fox (Diptera: Ceratopogonidae), pp. 405-428 in Zootaxa 5258 (4) on page 416, DOI: 10.11646/zootaxa.5258.4.3, http://zenodo.org/record/778442
FIGURE 8. Culicoides regalis. a in A taxonomic revision of the Indian species of the 'Aterinervis' group of Culicoides Latreille Subgenus Hoffmania Fox (Diptera: Ceratopogonidae)
No full textFIGURE 8. Culicoides regalis. a) head; b) maxillary palp; c) hind tibial spines; d) mid tarsis; e) wing; f) halter; g) spermathecae with ring; h) male genitalia and i) aedeagusPublished as part of Sarkar, Ankita, Banerjee, Paramita, Sinha, Shuvra Kanti & Mazumdar, Abhijit, 2023, A taxonomic revision of the Indian species of the 'Aterinervis' group of Culicoides Latreille Subgenus Hoffmania Fox (Diptera: Ceratopogonidae), pp. 405-428 in Zootaxa 5258 (4) on page 420, DOI: 10.11646/zootaxa.5258.4.3, http://zenodo.org/record/778442
Markowitz's portfolio selection model and related problems
No full textMarkowitz's portfolio selection theory is one of the pillars of theoretical finance. This formulation has an inherent instability once the mean and variance are replaced by their sample counterparts. The problem is amplified when the number of assets is large and the sample covariance is singular or nearly singular. This poses a fundamental problem, because solutions that are not stable under sample fluctuations may look optimal for a given sample, but are, in effect, very far from optimal with respect to the average risk. The paper starts with a general introduction to Markowitz’s portfolio theory and then discusses further developments and a few notable works in the area and later moves on to discuss the need for regularization and points out a few existing methods for regularization. After which a formulation of the optimal portfolio selection is presented and ends with a few numerical examples.M.S.Includes bibliographical referencesby Abhijit Ravipat
Fracture Modeling of Lithium-Silicon Battery Based on Variable Elastic Moduli
No full textMechanical stresses which develops during lithiation of crystalline silicon particles in lithium silicon battery causes fracture and limits the life of silicon based lithium batteries. We formulated an elasto-plastic stress formulation for a two-phase silicon model and investigated the influence of different mechanical properties of lithiated silicon on the fracture of nanoparticles during first cycle charging. A chemo-mechanical model was developed to determine lithium distribution and associated stress states during first cycle lithiation. The concentration gradient of lithium and an elastic perfectly plastic material behavior for silicon were considered to evaluate stress distribution formulation and determine stress field in the particle. The stress profile was used to perform a crack growth analysis. The stress distribution formulation was validated by evaluating stress field for different elastic modulus value for lithiated silicon and comparing our inference against observations from prior experiments. The results showed lower modulus of lithiated silicon yielded results like experimental observations for nanoparticles. The size dependent fracture behavior was also observed in lower elastic modulus of lithiated silicon. We conclude that accurate mechanical characterization of lithiated silicon nanoparticle is necessary to model the failure of silicon particle and improving the mechanical properties may suppress crack growth in silicon nanoparticles during charging.This article is published as Sarkar, Abhishek, Pranav Shrotriya, and Abhijit Chandra. "Fracture modeling of lithium-silicon battery based on variable elastic moduli." Journal of The Electrochemical Society 164, no. 11 (2017): E3606-E3612. DOI: 10.1149/2.0631711jes. Posted with permission.</p
Reactive Oxygen Species (ROS) and Reactive Nitrogen Species (RNS) in plants– maintenance of structural individuality and functional blend
No full textThe free radicals along with several reactive oxygen species (ROS) and reactive nitrogen species (RNS) are known to play a dual role in the biological living system which carries a substantial importance in terms of signal networking in plants. The production of these active molecules in different cellular compartments eventually led to oxidative damage. However recent discoveries have evidenced its crucial roles as signaling molecules, activating stress responses against environmental challenges. As can be seen, the cellular organelles are considered to be the primary repository and site of action for reactive species there by later with the establishment of stress signaling concept, the underlying mechanism of ROS/RNS interaction has been elucidated properly by cellular organelle based study. These efforts led to the identification of signaling cascades generated by ROS and RNS which are not only involved with various antioxidative pathways but also correspond with other stress specific mechanisms. This study focuses on a burgeoning area of plant study, highlights the site specific generation, interplay, effect on several metabolic pathways and mode of reaction of ROS/RNS in cells. The review moreover postulates the fundamental mechanism of ROS/RNS cross talking in a lucid manner which further helps to stand out its significant importance with respect to plant survival during the course of evolution. Increasing interest in the area of plant stress and the ROS/RNS signaling, more elementary knowledge regarding their specificity, regulation, flexibility yet to be explored at molecular level by the advancement of technology
Metabarcoding analysis of the bacterial succession during vermicomposting by the earthworm Eisenia fetida on municipal solid waste
No full textA culture-independent DNA metabarcoding analysis of the bacterial communities was carried out throughout a complete vermicomposting cycle of municipal solid waste material using the earthworm Eisenia fetida. 16S rRNA amplicons from the initial material (0 days), an intermediate (42 days), and a final stage (84 days) were sequenced in an Illumina NGS platform and compared. A steady increase in community diversity was observed corresponding to a 2.5-fold higher taxa richness and correspondingly risen values of the Shannon and Simpson ecological indexes and the evenness parameter. A total of 49665 operational taxonomic units (OTUs) were counted. From the qualitative standpoint, a clear successional shift was observed with an initial community dominated by putatively plantassociated groups belonging to the Rhizobiales order within the Alphaproteobacteria class, regressively leaving the scores of relative abundance (RA) to the Firmicutes phylum and in particular to the Bacilli. Vermistabilization of municipal solid waste (MSW) increased (P < 0.001) the TKN and total P content in the final vermicompost, while pH, TOC, and C/N ratio declined (P < 0.001) in the fprocess. Likewise, a progressive decrease was noticed in β-glucosidase, acid phosphatase, and urease activity while protease and dehydrogenase showed a slight increase, followed by a steep fall. A strong positive correlation was observed among the canonical functions of physico-chemical attributes and enzyme activities. The canonical correspondence analysis (CCA) revealed that significant families did not change on the temporal scale; however, their abundance was influenced by the abiotic environmental factors. In comparison to prior studies on vermicomposting that used different earthworm species (Eisenia andrei) and different substrates (lignified plant residues), results reflect a considerable degree of substrate specificity for the earthworm species used. The results offer clues to optimize the vermistabilization of MSW along with its potential use in agriculture, to foster improved levels of the circular economy
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