Search

Your search keyword '"Yadav, Renu"' showing total 563 results
Start Over Author "Yadav, Renu" Publication Year Range Last 10 years
563 results on '"Yadav, Renu"'

8. Anomalous Lasing Behavior in a Nonlinear Plasmonic Random Laser

Author

Yadav, Renu, Pal, Sourabh, Jana, Subhajit, Ray, Samit K., Brundavanam, Maruthi M., and N, Shivakiran Bhaktha B.

Subjects
Physics - Optics
Abstract

An unprecedented double-threshold lasing behavior has been observed in a plasmonic random laser composed of Au nanoislands decorated on vertically standing ZnO nanorods, infiltrated with dye-doped polymer matrix. The strong coupling of random laser modes to plasmonic nanocavities results in a dominant absorption of the random laser emission, leading to the first unusual lasing threshold. At higher pump fluences, the nonlinear optical behavior of the Au nanoislands induces a second lasing threshold. Various statistical tools have been employed to analyze the intensity fluctuations of the random laser modes, validating this unique lasing behavior.

Published
2024

21. Tracking nanoscale perturbation in active disordered media

Author

Yadav, Renu, Sebbah, Patrick, Brundavanam, Maruthi M., and N, Shivakiran Bhaktha B.

Subjects
Physics - Optics
Abstract

The disorder induced feedback makes random lasers very susceptible to any changes in the scattering medium. The sensitivity of the lasing modes to perturbations in the disordered systems have been utilized to map the regions of perturbation. A tracking parameter, that takes into account the cumulative effect of changes in the spatial distribution of the lasing modes of the system has been defined to locate the region in which a scatterer is displaced by a few nanometers. We show numerically that the precision of the method increases with the number of modes. The proposed method opens up the possibility of application of random lasers as a tool for monitoring locations of nanoscale displacement which can be useful for single particle detection and monitoring., Comment: 7 pages, 6 figures

Published
2022
Full Text
View/download PDF

30. Utility of an in-house real-time PCR in whole blood samples as a minimally invasive method for early and accurate diagnosis of invasive mould infections.

Author

Pandey, Mragnayani, Xess, Immaculata, Sachdev, Janya, Sharad, Neha, Gupta, Sonakshi, Singh, Gagandeep, Yadav, Renu Kumari, Rana, Bhaskar, Raj, Stephen, Ahmad, M.Nizam, Nityadarshini, Neha, Baitha, Upendra, Soneja, Manish, Shalimar, Prakash, Bindu, Sikka, Kapil, Mathur, Purva, Jyotsna, Viveka P., Kumar, Rakesh, Wig, Naveet, Gourav, Sudesh, Biswas, Ashutosh, and Thakar, Alok

Published
2024
Full Text
View/download PDF

41. Leadership and Gender: An Exploration of Two Female Administrators' Leadership Experiences in India

Author

Yadav, Renu and Lata, Priti

Abstract

Administrative leadership, both within and outside educational contexts, remains a male-centric field. Female leaders often are evaluated based on male leadership characteristics, a practice particularly evident in India's education sector. In India, only 35% of academics are women and even fewer are represented in leadership positions. This paper explores the experiences of two women working in administrative leadership positions in two Indian high schools. Interviews and questionnaires provided insight into how they perceived their opportunities, experienced barriers, and understood the impact of gender discrimination on their lives. The findings of this study are anticipated to encourage and provide insights to women who may aspire to assume academic leadership positions in education.

Published
2018

50. Antioxidant enzyme activities and markers of oxidative stress in the life cycle of different Earthworm species.

Author

Kumar, Rahul, Yadav, Renu, Gupta, R. K., Pal, Ajay, Yodha, Kiran, and Kumar, Akshay

Subjects
*OXIDATIVE stress, *EARTHWORMS, *ANTIOXIDANTS, *ENVIRONMENTAL toxicology, *REACTIVE oxygen species
Abstract

Earthworms play a crucial role in soil fertility through decomposition, nutrient mineralization and water infiltration, and they are used as a standard organism in ecotoxicological testing. However, to use them for evaluations of environmental pollution, knowledge on the age-related variations in antioxidant enzymes within this species as they undergo different environmental conditions such as treatment to heavy metal insecticides, herbicides, salinity and polluted soil, vermifiltration etc. that cause stress. Due to oxidative stress, the growth and reproductive potential of earthworms are affected because of an imbalance between antioxidant enzymes and Reactive oxygen species (ROS). This study provides a fundamental understanding of the antioxidant enzyme activity and oxidative stress in three earthworm species (Eisenia fetida, Eudrilus eugeniae and Pheretima posthuma) at various stages of their lives. Before studying their usage as potential biomarkers, it is necessary to explore the age-related variations in antioxidant enzymes within these species which serve as the quintessential terrestrial invertebrates in evaluations of environmental pollution. The superoxide dismutase (SOD), catalase (CAT), ascorbic peroxidase (APX), and peroxidase (POD), as well as hydrogen peroxide (H2O2) as an oxidative stress marker, were measured in the total body of juvenile, sub-adult, and adult earthworms. SOD and CAT activities respectively declined and increased with age in all earthworm species and maximum SOD activity (4.86 U/g FW) and CAT activity (12.33 U/g FW) were found in respectively juvenile (EF-J) and adult (EF-A) stages of E. fetida. In P. posthuma, APX and POD activities rose with age. APX activity was significantly maximum (6.18 U/g FW) in P. posthuma adult stage (PP-A) whereas significant maximum POD activity (0.46±0.01ΔOD/min) in EF-J stage. H2O2, an oxidative stress marker, increased with age in all earthworm species. P. posthuma adult (PP-A) had the maximum activity (4.06 µmole/g FW), and EF-J life stage had the lowest activity (1.35 µmole/g FW). In response to increased oxidative stress (H2O2), the antioxidant enzymes (SOD, CAT, APX, and POD) work together. Overall, Eisenia fetida performed better than E. eugeniae and P. posthuma. This study fills the gaps in antioxidant enzyme activities at the different age stages of earthworms. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results