Browsing by Author "Ramesh Chandra Gupta"

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Effect of thermomechanical treatment on structure and mechanical properties of Mo-bearing dual phase steel
(Verlag Stahleisen mbH, 1995) Ashok Kumar Panda; Ratan Indu Ganguly; Dharba Subramanya Sarma; Ramesh Chandra Gupta; Somnath Misra
The effects of hot rolling of a dual phase steel in the (α+γ) range on microstructure and mechanical properties was investigated by using two thermomechanical (TMT) routes. The first consisted of heating Ac(3), soaking, cooling to deformation temperature in the (α+γ) range. The second comprises heating to deformation temperature in the (α+γ) range, followed by rolling and quenching. Parameters varied were temperature (with the first route) and extent of deformation (with the second). The microstructures were characterized by optical and transmission electron microscopy. The results indicate a distinct difference in the final structure and properties due to the two different TMT routes. The first TMT route resulted in a greater amount of ferrite, finer lath width of martensite, finer ferrite grain size and increased density of dislocations. The strength properties decreased, the YS/UTS ratio decreased and ductility increased with the increase in the extent and temperature of deformation. However, TMT route 2 resulted in an increase in the amount of martensite, finer ferrite grain size, decrease in the martensite lath width and increased dislocation density. The strength properties increased, YS/UTS ratio increased and ductility decreased with increase in the extent and temperature of deformation.
First report of Brachysporium britannicum (Trichosphaeriaceae) from India
(Springer, 2019) Manish Kumar Dubey; Zoya Shah; Ram Sanmukh Upadhyay; Ramesh Chandra Gupta
Brachysporium britannicum (Trichosphaeriales) was discovered on leaf litter from the Ramgarh forest, Nainital, Uttarakhand, India. B. britannicum was found on decaying leaf litter of Quercus floribunda. Morphologically, it lines well with Brachysporium. The conidia are produced singly or in groups at the apex of the conidiophore, typically pendulous, ellipsoid to broadly ellipsoid, predominantly two-septate (transverse), broadly rounded at ends; basal cell small, crucible-shaped, hyaline with short or small pedicel; gently expanded conspicuous central cell, disc-shaped, brown to very dark brown, occasionally subhyaline, and hyaline terminal cell are the hallmark feature of the fungus. This rare species is recorded for the first time from India. Detailed taxonomic information on this Brachysporium species includes descriptions, geographical distribution, comments and illustrations, and a comparison with closely allied taxa. © 2019, Indian Phytopathological Society.
Michael-Reaction-Based Simple “Turn-On” Fluorescent Chemodosimeter to Detect Cys in Partial Aqueous Medium
(Wiley-Blackwell, 2018) Priyanka Srivastava; Ramesh Chandra Gupta; Arvind Misra
The present work describes design and synthesis of dicyanovinylpyrene as a molecular probe 1. The photophysical studies of probe 1 shows intramolecular charge transfer (ICT) behavior. Probe 1 upon interaction with different amino acids in partial aqueous medium shows high selectivity for cysteine (Cys) through a chemical reaction based chemodosimeter approach. The observed change in the photophysical behavior and fluorescence “turn–on” response upon interaction with Cys is attributed to the formation of Michael type adduct in the medium. The mode of interaction between probe 1 and Cys has been confirmed by the 1HNMR, 13CNMR, HRMS spectroscopic data and significant change in the morphological feature. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
Quadracaea mediterranea, a new record from Kumaun Himalaya region, India
(Mycotaxon Ltd, 2020) Manish Kumar Dubey; Ram Sanmukh Upadhyay; Zoya Shah; Dhani Arya; Ramesh Chandra Gupta
Quadracaea mediterranea was collected during our continuing mycological survey of saprobic conidial fungi on decaying leaf litter of Quercus floribunda from the Ramgarh forest, Nainital, Uttarakhand, India. Detailed taxonomic information on Q. mediterranea includes morphological description, geographical distribution, comments, illustrations, and a comparison with allied taxa. This finding extends the geographic distribution of the species, previously recorded only in China, Italy, and Brazil. © 2020 Mycotaxon Ltd. All rights reserved.
Slotted Waveguide Circular Arc Array Terminated in A Bio-medium for Hyperthermia
(International Academy of Microwave and Optical Technology (IAMOT), 2007) Ramesh Chandra Gupta; S.P. Singh
A novel and effective hyperthermia applicator utilizing a circular arc phased array of longitudinal slots in narrow wall of rutile-loaded rectangular waveguide is presented and analyzed in this paper. This configuration is mainly intended as a specialized and very effective applicator for hyperthermia treatment of tumor within curved portions of human body such as abdomen, neck, chest etc. Each slot is excited by a coaxial line probe. The expression for electric field in biomedium due to slotted waveguide arc array is derived utilizing Fresnel-Kirchhoff scalar diffraction field theory. The contour distribution of specific absorption rate (SAR) in x-z, x-y and y-z planes and SAR distribution in y-direction due to the arc array as direct contact applicator are evaluated at 433 MHz. The parameters such as penetration depth, power absorption coefficient, effective transverse field size (TFS), effective longitudinal field size (LFS) are obtained for the arc array. It is shown that by changing the phase and amplitude of excitation of each slot of the array, relative shape (TFS) and position of the hot spot can be changed. © 2007 ISRAMT. All Rights Reserved.
Spadicoides obovata: a new record from Kumaun Himalaya, India
(Springer, 2022) Manish Kumar Dubey; Ram Sanmukh Upadhyay; Ramesh Chandra Gupta
Spadicoides obovata occurring on the decaying leaf litter in Berinag forest, Pithoragarh, Uttarakhand, India is described and illustrated. This rare newly recorded fungal species from India is characterized by single, straight or slightly curved, obovoid conidia with usually up to 2 septa appearing as thick dark bands, borne over the simple, erect, and proliferating conidiophores. Apart from it, the conidiogenous cells generally formed by terminal or subterminal cells, with several minute pores serve as another conspicuous feature. Notes, illustrations, descriptions based on natural substrates and comparisons with other related species based on morphological traits are provided in this paper. This represents the first report of S. obovata from India. © 2021, Society for Plant Research.
Sporidesmium binserum sp. nov. from Binser forest of Almora, Himalaya, India
(Springer, 2018) Manish Kumar Dubey; Ram Sanmukh Upadhyay; Deeba Kamil; Ramesh Chandra Gupta
A new and interesting species of Sporidesmium was discovered during a survey of plant debris inhibiting litter decomposing microfungi in Binser forest, Almora, Uttarakhand, India. This new species, Sporidesmium binserum sp. nov., a dematiaceous hyphomycete was found on decaying leaf litter of the host plant Quercus leucotrichophora (oak). The key features of special interest that distinguish it from other morphologically similar species of Sporidesmium are macronematous, mononematous, percurrent proliferations towards the end in the flexuous multiseptate conidiophores with obtuse tip having distinctively curved, fusiform to subfusiform, 3-septate conidia, consist of 3 cells, second cell dark brown with slightly or distinctly constricted at the septa, tip cell of conidia highly curved and/or twisted, mostly flat and conic-truncated ends at base due to schizolytic secession. The conidial maturation is presumably synchronous with conidial ontogeny. Based on these features, the specimen is proposed here as a new species. Apart from it, a note on the current status of Sporidesmium sensu lato in India is also provided. © 2018, Indian Phytopathological Society.
Two Ceratosporella (Fungi: Ascomycota) species from oak leaf liter in Almora, Utarakhand, India
(Zoo Outreach Organisation, 2024) Manish Kumar Dubey; Ram Sanmukh Upadhyay; Ramesh Chandra Gupta
Two species of Ceratosporella collected on leaf liter of Mohru Oak Quercus foribunda in Utarakhand, India, are described herein and compared with closely allied species. They are Ceratosporella deviata and Ceratosporella cheiroidea. Among them, C. cheiroidea is newly recorded from India. Morphological descriptons, illustratons, and comments are provided for the aforementoned species. © Dubey et al. 2024. Creatve Commons Atributon 4.0 Internatonal License. JoTT allows unrestricted use, reproducton, and distributon of this artcle in any medium by providing adequate credit to the author(s) and the source of publicaton