Browsing by Author "Shweta Verma"

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Dirac oscillator in an external magnetic field
(Elsevier, 2010) Bhabani Prasad Mandal; Shweta Verma
We show that (2 + 1)-dimensional Dirac oscillators in an external magnetic field is mapped onto the same with reduced angular frequency in absence of magnetic field. This can be used to study the atomic transitions in a radiation field. Relativistic Landau levels are constructed explicitly. Several interesting features of this system are discussed. © 2009 Elsevier B.V. All rights reserved.
Exploratory analysis of agro-morphological characteristics in Nigella sativa L. plant genotypes to determine mutagen colchicine ameliorative/ non-ameliorative impacts
(Nature Research, 2024) Shweta Verma; Manisha Hariwal; Sanjay Kumar
This experimental study aimed to elucidate the optimal colchicine concentration for inducing polyploidy and to examine the morphological effects on Nigella sativa L. (family Ranunculaceae) plants recognized as ‘Kalonji’ in India. Here, seeds were exposed with different concentration of colchicine ranging from 0.025 to 0.4% with varying time duration (24–48 h). The agro-morphological attributes and chromosome counts of the putative polyploids were compared with control diploid plants, revealing significant differences. The ploidy level determined by chromosome counts revealed that 0.05–0.1% concentration of colchicine induced tetraploids within both plant genotypes for 24 h and 48 h. However, results based on agro-morphological trait correlation analysis revealed more significant association among yield traits at 0.1% concentration and the principal component analysis revealed that the maximum possible ameliorative effect of the colchicine dose was the lowest concentration (0.025% for a 48-hour exposure time) for the AN1 genotype; likewise, a 0.05% concentration established a more positive association in terms of growth and yield attributes for the AN20 genotype. This study demonstrated that low dosages (0.025% and 0.1%) strongly impact plant growth and yield, whereas higher dosages obliterate these positive effects and add destructive characteristics within plants which ultimately reduces yield. © The Author(s) 2024.
Hyoscyamal, a new tetrahydrofurano lignan from Hyoscyamus niger Linn.
(2009) A. Sajeli Begum; Shweta Verma; Mahendra Sahai; Kathrin Schneider; Roderich Sussmuth
In addition to the isolation and complete characterisation of a new lignan, hyoscyamal, three other compounds, balanophonin, pongamoside C and pongamoside D have been isolated from the seeds of Hyoscyamus niger. The structures of the compounds were settled on the basis of spectroscopic analysis. This is the first report on the isolation of these compounds from a solanaceous plant. © 2009 Taylor & Francis.
Hyosmin, a new lignan from Hyoscyamus niger L.
(Scientific Reviews Ltd., 2006) Ahil Sajeli Begum; Shweta Verma; Mahendra Sahai; Teigo Asai; Noriyuki Hara; Yoshinori Fujimoto
Hyosmin (1) a new lignan has been isolated from the seeds of Hyoscyamus niger L. (Solanaceae), and its structure shown to be the 3-{[(2R)-2- carbomethoxy-2-hydroxy]ethyl}benzoate ester of {(2R,3S,4S)-2-(4-hydroxy-3- methoxyphenyl)-3-hydroxymethyl-4-[(4-hydroxy-3-methoxyphenyl)methyl] tetrahydrofuran.
Molecular Farming of Medicinal Plants in Face of Environmental Challenges
(Springer Nature, 2023) Priya Patel; Priyanka Shah; Manisha Hariwal; Shweta Verma; Rahul Yadav; Sanjay Kumar
The uses of medicinal plant as a medicine and secondary metabolites are about a century old, but genetic engineering of these medicinal plants for production of pharmaceuticals is much more recent. Molecular farming aids in increasing the pharmaceutical compounds which are easily available and significantly cost-effective. Recently the cost of biopharmaceutical availability is limited, but plant-based pharmaceuticals are available in stores, and it is cheap to produce the plant-based compounds which help scale up the industry. Here we discussed the recent development of molecular farming in this field and possible environ-mental challenges. © The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.
Targeted Improvement of Medicinal Plant Under Stress Condition Through CRISPR-Cas-Mediated Genome Engineering
(Springer Nature, 2023) Priyanka Shah; Priya Patel; Manisha Hariwal; Shweta Verma; Rahul Yadav; Sanjay Kumar
A wide variety of environmental stresses are experienced by plants, which lowers and limits the yield of agricultural products. Plants experience two different kinds of environmental stress, which are classified as (1) Biotic stress and (2) Abiotic stress. Major crop plants are lost due to abiotic stress, which includes salinity, radiation, floods, extreme temperatures, cold, and heavy metals, etc. However, biotic stressors also include threats from herbivores, bacteria, oomycetes, nematodes, and other pathogens. To avoid these stresses, scientists develop genome-editing technology which provides new opportunities for crop improve-ment and advancement in plant breeding by targeting crop traits. Medicinal plants are very important as socio-economic purpose. To overcome these stresses, medicinal plant under stress condition uses CRISPR-Cas technology. It is site-directed genome editing. Here, we studied the application of CRISPR-Cas to improve medicinal plant under stress condition. © The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.