Browsing by Author "Kumar Y."
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Item Design and synthesis of heteroleptic Ni(II) dipyrrin complexes for electrochemical proton reduction reactions: Cyclic voltammetric and theoretical studies(Elsevier B.V., 2024) Paitandi R.P.; Mondal I.; Kumar Y.; Singh N.K.; Pandey D.S.The effect of nuclearity on electrochemical hydrogen generation using new heteroleptic Ni(II) complexes containing redox-active dipyrrin and dithiocarbamate ligands has been described. Complexes 1�2 have been meticulously characterized by spectroscopic studies (ESI-MS, IR, 1H, 13C NMR, UV�vis) and their structures unambiguously confirmed by X-ray single crystal analyses. Electrocatalytic properties of the complexes toward hydrogen evolution reaction have been investigated by cyclic voltammetric studies in an organic medium in the presence of acetic acid as a weak proton source. Notably, complexes 1 and 2 produce H2 via doubly reduced Ni(II) species i.e. Ni(0) in the presence of acetic acid. Further, these complexes exhibited significant electrocatalytic activity (TOF: 264 (1) and 650 s?1 (2). Controlled potential electrolysis established a minimum Faradaic efficiency of 92 (1) and 96 % (2). Complex 2 exhibited higher turnover frequency relative to 1, while 1 showed lower overpotential (0.35 V) in comparison to 2 (0.45 V). The stability of the complexes and the amount of produced H2 has been investigated by bulk electrolysis study. A tentative mechanism (ECEC; E, electrons and C, chemical steps) and involved intermediate species for the proton reduction reaction for 1 has been established by theoretical studies. � 2024 Elsevier B.V.Item Long-term application of agronomic management strategies effects on soil organic carbon, energy budgeting, and carbon footprint under rice�wheat cropping system(Nature Research, 2024) Naresh R.K.; Singh P.K.; Bhatt R.; Chandra M.S.; Kumar Y.; Mahajan N.C.; Gupta S.K.; Al-Ansari N.; Mattar M.A.In the plains of western North India, traditional rice and wheat cropping systems (RWCS) consume a significant amount of energy and carbon. In order to assess the long-term energy budgets, ecological footprint, and greenhouse gas (GHG) pollutants from RWCS with residual management techniques, field research was conducted which consisted of fourteen treatments that combined various tillage techniques, fertilization methods, and whether or not straw return was present in randomized block design. By altering the formation of aggregates and the distribution of carbon within them, tillage techniques can affect the dynamics of organic carbon in soil and soil microbial activity. The stability of large macro-aggregates (> 2 mm), small macro-aggregates (2.0�2.25 mm), and micro-aggregates in the topsoil were improved by 35.18%, 33.52%, and 25.10%, respectively, over conventional tillage (0�20 cm) using tillage strategies for conservation methods (no-till in conjunction with straw return and organic fertilizers). The subsoil (20�40 cm) displayed the same pattern. In contrast to conventional tilling with no straw returns, macro-aggregates of all sizes and micro-aggregates increased by 24.52%, 28.48%, and 18.12%, respectively, when conservation tillage with organic and chemical fertilizers was used. The straw return (aggregate-associated C) also resulted in a significant increase in aggregate-associated carbon. When zero tillage was paired with straw return, chemical, and organic fertilizers, the topsoil's overall aggregate-associated C across all aggregate proportions increased. Conversely, conventional tillage, in contrast to conservation tillage, included straw return as well as chemical and organic fertilizers and had high aggregate-associated C in the subsurface. This study finds that tillage techniques could change the dynamics of microbial biomass in soils and organic soil carbon by altering the aggregate and distribution of C therein. � 2024, The Author(s).Item Publisher Correction: Long-term application of agronomic management strategies effects on soil organic carbon, energy budgeting, and carbon footprint under rice�wheat cropping system (Scientific Reports, (2024), 14, 1, (337), 10.1038/s41598-023-48785-z)(Nature Research, 2024) Naresh R.K.; Singh P.K.; Bhatt R.; Chandra M.S.; Kumar Y.; Mahajan N.C.; Gupta S.K.; Al-Ansari N.; Mattar M.A.In the original version of this Article, Mohamed Mattar was omitted as a corresponding author. Correspondence and requests for materials should also be addressed to mmattar@ksu.edu.sa. � The Author(s) 2024.Item Study on the physiological impact of salicylic acid and kinetin on growth dynamics, floral morphogenesis and seed yield of Sweet William(Indian Academy of Horticultural Sciences, 2024) Kumari P.; Tsomu T.; Singh A.K.; Tasung A.; Debnath A.; Sharma M.M.; Bhuyan S.; Samyor D.; Sahu T.; Kumar Y.This study investigated the impact of salicylic acid and kinetin on the growth, flowering, and seed yield of Sweet William (Dianthus barbatus L.). The concentration of SA ranged from 10 to 40 ppm and for kinetin it was 5 to 20 ppm alongwith a control. It was revealed that SA at 20 ppm induced the maximum plant height at 60 days after treatment (DAT), while kinetin at 15 ppm exhibited the highest plant height at 90 DAT. SA at 20 ppm influenced primary and secondary branches, stem diameter, and leaf count. It accelerated bud initiation at 55 DAT and prompted the earliest floral anthesis at 66.16 DAT, acting as a blooming time regulator. Kinetin at 20 ppm stimulated the highest number of flowers per plant (543.83) and increased the fresh and dry weight of flowers at 10 ppm. Additionally, kinetin at 20 ppm enhanced the total seed production. SA at 40 ppm recorded the highest seed yield per plant and 1000-seed weight as well. Optimal treatment involves SA at 20 ppm for enhanced, while kinetin at 20 ppm positively influences flower and seed production. � 2024, Indian Academy of Horticultural Sciences. All rights reserved.
