1,122 research outputs found
Euryhalinema pallustris Chakraborty & Maruthanayagam & Achari & Pramanik & Jaisankar & Mukherjee 2021, sp. nov.
No full textEuryhalinema pallustris Chakraborty & Mukherjee sp. nov. Description Thallus greenish in color, forming a mat-like biofilm. Filaments typically unbranched, straight, isopolar, attached to the soil surface (mainly sub-aerophytic) growing as an extensive mat-like biofilm. Cells of the intermediate trichome were larger in size than the cells towards apex, cells much longer than wide, cellular dimensions 1.1 - 1.6 µm (length) and 0.4 - 0.5 µm (width), mucilaginous sheath absent, cell contents homogeneous, green without any granulated appearance, aerotopes absent. No heterocytes and akinetes. Cell division takes place by asymmetrical binary fission. Reproductive propagation by the help of hormogonia. Holotype: Holotype (AP3) deposited and cryopreserved in Microbial Culture Collection (MCC), India bearing an accession number MCC3172. Type locality: Sagar island (21.44.7N 88.7.2E) of the Indian Sundarbans, India. Etymology: The specific epithet ‘ pallustris’ represents the swampy habitat of the strain from where it was collected.Published as part of Chakraborty, Sandeep, Maruthanayagam, Veerabadhran, Achari, Anushree, Pramanik, Arnab, Jaisankar, Parasuraman & Mukherjee, Joydeep, 2021, Aerofilum fasciculatum gen. nov., sp. nov. (Oculatellaceae) and Euryhalinema pallustris sp. nov. (Prochlorotrichaceae) isolated from an Indian mangrove forest, pp. 165-186 in Phytotaxa 522 (3) on pages 182-183, DOI: 10.11646/phytotaxa.522.3.1, http://zenodo.org/record/556037
Corrigendum: Planning for livelihoods under hydrosocial uncertainty in periurban Pune(Front. Water, (2022), 4, (831464), 10.3389/frwa.2022.831464)
No full textIn the published article, there was an error in the author list, and authors “Sharlene L. Gomes, Shreya Chakraborty, and Leon M. Hermans” were erroneously excluded. The corrected author list appears below. “Sarah Luft Faculty of Mathematics and Natural Sciences, Institute for Geography, University of Cologne, Cologne, Germany Sharlene L. Gomes Faculty of Governance and Global Affairs, Institute of Public Administration, Leiden University, The Hague, Netherlands Shreya Chakraborty South Asia Consortium for Interdisciplinary Water Resources Studies, Hyderabad, India Leon M. Hermans Faculty of Technology, Policy, and Management, Delft University of Technology, Delft, Netherlands and Land andWaterManagement Department, IHE Delft Institute forWater Education, Delft, Netherlands.Policy Analysi
Vulnerability assessment for Sagar Island coast, West Bengal with respect to inundation hazards
Get PDF1521-1527Gangasagar coast of Sagar Island which lies in the Ganga delta is dynamic in nature where coastal processes play a significant role. Analysis of shoreline configuration from the year 1969 to 2009 indicates that shoreline has been retreated. Assessment of vulnerability has been done taking on six geological and physical variables namely geomorphology, sea-level rise rate, coastal slope; shoreline erosion rate, mean wave height and mean tide range. Coastal vulnerable index values vary location wise. In general, CVI values are very high to high in the western sector. In the eastern sector values are moderate to low. In the south western most part, the value is very high where the coast (near Beguakhali) has been substantially eroded which is evident from the observation that older light house now stands in the sea at about 100 m from the coastline
Integrated bioprocess for conversion of gaseous substrates to liquids
No full textIn the quest for inexpensive feedstocks for the cost-effective production of liquid fuels, we have examined gaseous substrates that could be made available at low cost and sufficiently large scale for industrial fuel production. Here we introduce a new bioconversion scheme that effectively converts syngas, generated from gasification of coal, natural gas, or biomass, into lipids that can be used for biodiesel production. We present an integrated conversion method comprising a two-stage system. In the first stage, an anaerobic bioreactor converts mixtures of gases of CO₂ and CO or H₂ to acetic acid, using the anaerobic acetogen Moorella thermoacetica. The acetic acid product is fed as a substrate to a second bioreactor, where it is converted aerobically into lipids by an engineered oleaginous yeast, Yarrowia lipolytica. We first describe the process carried out in each reactor and then present an integrated system that produces microbial oil, using synthesis gas as input. The integrated continuous bench-scale reactor system produced 18 g/L of C16-C18 triacylglycerides directly from synthesis gas, with an overall productivity of 0.19 g⋅L⁻¹⋅h⁻¹ and a lipid content of 36%. Although suboptimal relative to the performance of the individual reactor components, the presented integrated system demonstrates the feasibility of substantial net fixation of carbon dioxide and conversion of gaseous feedstocks to lipids for biodiesel production. The system can be further optimized to approach the performance of its individual units so that it can be used for the economical conversion of waste gases from steel mills to valuable liquid fuels for transportation.United States. Advanced Research Projects Agency-Energy (DE-AR0000059)United States. Department of Energy (DE-SC0008744
Eclectic Notes on Uncertainty, Information, and Classical Dynamics
Get PDFInformation is everywhere in nature which is very uncertain and unpredictable. But information, in itself, is a very ambiguous term. In this cursory write-up, we attempt to understand the formal meaning of information by quantifying uncertainty and discuss how it naturally appears in two core topics of classical physics -- classical mechanics and statistical mechanics. In the process, we witness how the concepts of the information theory render a unique viewpoint in physics. Except for the presentation of the material, the author claims no originality; however, the responsibility of every inadvertent error lies entirely with the author.Essentially the write-up is summarized lecture-notes of a course taken by UG and PG physics students of IIT Kanpur, Indi
On certain new notion of order Cauchy sequences, continuity in (l)-group
Get PDF[EN] In this paper, we introduce the notions of order quasi-Cauchy sequences, downward and upward order quasi-Cauchy sequences, order half Cauchy sequences. Next we consider an associated idea of continuity namely, ward order continuous functions [2] and investigate certain interesting results. The entire investigation is performed in (l)-group setting to extend the recent results in [5, 6].Council of Scientific and Industrial Research, HRDG, IndiaPal, SK.; Chakraborty, S. (2022). On certain new notion of order Cauchy sequences, continuity in (l)-group. Applied General Topology. 23(1):55-68. https://doi.org/10.4995/agt.2022.16126OJS5568231Y. Abramovich and G. Sirotkin, On order convergence of nets, Positivity 9 (2005), 287-292.https://doi.org/10.1007/s11117-004-7543-xD. Burton and J. Coleman, Quasi-Cauchy sequences, Amer. Math. Monthly 117, no. 4 (2010), 328-333.https://doi.org/10.4169/000298910x480793I. Canak and D. Mik, New types of continuity, Abstr. Appl. Anal. 2010 (2010), Article ID: 258980. [5]H. Çakalli, Slowly oscillating continuity, Abstr. Appl. Anal. 2008 (2008), Article ID 485706.https://doi.org/10.1155/2008/485706H. Çakalli, Forward Continuity, J. Comput Anal. Appl. 13, no. 2 (2011), 225-230.H. Çakalli, Statistical ward continuity, Applied Mathematics Letters 24 (2011), 1724-1728.https://doi.org/10.1016/j.aml.2011.04.029H. Çakalli, Statistical quasi-Cauchy sequences, Mathematical and Computer Modelling 54 (2011), 1620-1624.https://doi.org/10.1016/j.mcm.2011.04.037H. Çakalli and B. Haarika, Ideal quasi-Cauchy sequences, J. Inequal. Appl. 234 (2012), 1-11.https://doi.org/10.1186/1029-242X-2012-234R. Engelking, General topology, Sigma Ser. Pure Math., Heldermann, Berlin Vol. 6 2nd Edition (1989). [17]H. Fast, Sur la convergence statistique, Colloq. Math. 2 (1951) 241-244.https://doi.org/10.4064/cm-2-3-4-241-244J. A. Fridy, On stastistical convergence, Analysis 5 (1985), 301-313.https://doi.org/10.1524/anly.1985.5.4.301P. Kostyrko, T. Šalát and W. Wilczyński, -convergence, Real Anal. Exchange. 26, no. 2 (2000/2001), 669-685.https://doi.org/10.2307/44154069I. J. Schoenberg, The integrability methods, Amer. Math. Monthly 66 (1959), 361-375.https://doi.org/10.1080/00029890.1959.11989303R. W. Vallin, Creating slowly oscillating sequences and slowly oscilating continuous functions, Acta. Math. Univ. Comenianae 25 (2011), 71-7
Euler's Limit -- Revisited
Get PDFThe aim of this short note is that if and are two
sequences of positive real numbers such that and
satisfying the asymptotic formula , where , then
.Comment: 1 pag
On the cardinality of unique range sets with weight one
Get PDFTwo meromorphic functions and are said to share the set with weight , if where where if and if .
In this paper, we improve and supplement the result of L. W. Liao and C. C. Yang (On the cardinality of the unique range sets for meromorphic and entire functions, Indian J. Pure appl. Math., 31 (2000), no. 4, 431-440) by showing that there exist a finite set with cardinality such that implies .10 pages. arXiv admin note: text overlap with arXiv:1711.08808, arXiv:1608.0212
Electronic characterization of mass-selected acyclic, polycyclic and oxygenated hydrocarbons in neon matrices
Get PDFInterstellar chemistry embarked with the discovery of CH, CH+, and CN in extraterrestrial clouds. Presently, a large number of molecules have been identified in different galactic environments mostly by millimeter-wave and infrared spectroscopy. Molecular complexity and the spectral features dramatically depend on the particle density and the temperature of the astronomical region where they reside. Hence, spectroscopic analysis of extraterrestrial molecules has a valid mean to probe the physical and chemical condition and history of galactic media.
Life on Earth is carbon based and surprisingly, similar tendency has been found in interstellar molecules. Almost 80 percent of detected species contain carbon as a major constituent. Hence, a better characterization of the molecular universe may elucidate the origin of terrestrial life.
Two long standing riddles in molecular astrophysics are the diffuse interstellar absorption lines in the visible and the broad emission features in the mid-infrared. Carbonaceous systems ranging from small acyclic to polycyclic aromatics are considered to be the carriers of these absorption and emission bands. To recognize individual molecules responsible for these transitions, spectroscopic analysis of astrophysically relevant species in the laboratory is needed; comparison studies between astronomical measurements and laboratory spectra are the way for identification. These exotic molecules may be stable in galactic clouds under very cold and low density conditions but are extremely short-lived in the laboratory framework. Therefore, noncontemporary synthesizing and sensitive characterizing methods are required.
The matrix isolation spectroscopy is considered as an outdated-technique after the discovery of laser-based experiments but in combination with theory, it still serves a pivotal role in characterization of transient species. Exotic organics are synthesized in electrical discharge for the respective precursors. The ions of interest are co-deposited with neon on a cold surface (6 K) after mass-selection. Neutrals are generated in the matrix by UV irradiation.
The acyclic unsaturated organics possess very unique structural flexibility. By mass selective deposition of a particular m/z ratio in solid neon, several isomers have been detected. An advantage of the matrix isolation technique is that all possible electronic transitions of trapped species in the experimental measurement range can be recorded at once. Rare gases provide an environment in which the guest-host interactions slightly perturb the experimental band positions as compared to the gas-phase. Still matrix isolated spectrum is a good starting point for high resolution study and thence astrophysical findings.
Moderately intense absorptions are observed both in the visible and UV for C7Hn+/0 and C5Hn+/0, and charged oxygen containing polycarbon chains H2C6O+, HC7O+, and C4O2+ in neon matrices. The structural assignments of the electronic systems have been made on the basis of calculated ground-state stabilities with DFT and MP2 level of theory and computed excitation energies with TD DFT, SAC-CI, and CASPT2 methods. However, some of these ions and radicals have strong possibility to be the carriers of diffuse interstellar bands. The neutral oxygenated hydrocarbons are excluded as the carriers because no transition was detected after irradiation of the matrix. Theory explains that they possess strong transition in the deep UV. In addition, protonated PAHs and their oxygen containing analogs, which are credited for unidentified emission features, have been studied. Strong optical transitions suggest that they could be carriers of diffuse interstellar bands as well. A key species in combustion chemistry likely responsible for PAHs formation via mass-growth processes, fulvenallenyl radical, has been electronically characterized.
A part of this dissertation is devoted to physical organic chemistry. Reaction intermediates are too short-lived to probe. Nevertheless, identification of these species helps to infer a probable synthetic mechanism. Vibrationally resolved electronic spectra of fluorenylium, phenalenylium and fluorenyl radical have been measured in a neon matrix.
This electronic transition database of transient molecules created in the thesis can be used for their further gas-phase analysis and in situ detection in reaction or combustion systems
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