Krishnaveni S

• Ph.D
• Professor at University of Mysore

Integrating bio-inspired materials into TENGs marks a significant step toward sustainable and eco-friendly energy harvesting systems, with promising applications in robotics, wearable electronics, and human-machine interfaces. In the present study,...

The emergence of wearable electronics in contemporary lifestyles has spurred the need for smart fabrics capable of harnessing biomechanical energy. In the present study, a flexible polyaniline‐doped textile‐based triboelectric nanogenerator (PT‐TENG) is designed to harvest low‐frequency mechanical vibrations and convert them into electricity. For t...

This article investigates the impact of 100 MeV O⁷⁺ and 50 MeV Li³⁺ ions on Silicon Photodetectors, focusing on their electrical characteristics with similar Sn/Se ratios. Elevated ion fluences led to a significant rise in the ideality factor “n”, indicating the presence of Generation-Recombination (G-R) current due to introduced defects, especiall...

Bimetallic nanoparticles are of great significance in numerous areas due to their unique properties and diverse applications. In the present study, silver (Ag) and cobalt (Co) monometallic nanoparticles (MNPs) and AgCo bimetallic nanoparticles (BNPs), are synthesized using a simple wet chemical route. Various analytical techniques are adopted for t...

To shield people from dangerous gamma radiation, it is imperative to fabricate inexpensive and environmentally friendly materials. In the present work, suitability of concrete with various % concentrations of ceramics as gamma-ray shielding material has been studied. In this regard, concrete mixture using M-sand and cement with ceramic as filler in...

The exploration of innovative materials and their integration into mechanical energy harvesters represents a crucial step in addressing futuristic energy requirements. In the present work, 0D-cesium lead bromide (Cs4PbBr6) perovskite is synthesized by a modified re-precipitation technique and purposed as a dopant in polymer at an active layer of n...

Ribosomes are essential cellular organelles made up of rRNA and rproteins found in both prokaryotic and eukaryotic cells, and play an important role in protein synthesis. The functional ribosomes are synthesized through the process called ribosome biogenesis, which proceeds with the help of certain factors such as chaperones, ribosomal proteins, an...

The proliferation of single‐use plastics has led to widespread pollution and ecological harm, prompting a concerted effort to develop sustainable alternatives. Among them, biocomposite plastic films have emerged as a promising solution for food packing applications. Herein, the preparation of polyvinyl alcohol (PVA) biocomposite films incorporating...

The advancement of environmentally friendly chemical synthesis in both academic and corporate research has recently taken on enormous relevance. Pesticides are substances, either chemical or biological, that are used to get rid of or lessen the impact of pests. To control the fungi in crops a new set of isoxazolylpyrimidine derivatives were planned...

Elongation factor Tu (EF-Tu) is an important class of translational GTPases (trGTPases) involved in the elongation process. EF-Tu functions by forming the tight complex with the aminoacyl-tRNA (aa-tRNA: transfer RNA carrying an amino acid) in the GTP-bound active state and subsequently transports the aa-tRNA to the A-site (aminoacyl-site) of the ri...

Water has covered a wide part of the earth’s surface. Oceans and other water bodies contain significant natural and environmental resources as well as aquatic life. Due to humans’ hazardous and unsuitable underwater (UW) settings, these are generally undiscovered and unknown. As a result of its widespread utility in fields as diverse as oceanograph...

In outer space, we find many types of radiations that are due to solar flares, radiation belt, cosmic rays, etc. We are fortunate enough to be protected from these radiations on the surface of the Earth, whereas in other celestial objects such as planets and satellites, without a protecting atmosphere, penetration of radiation that may be ionising...

Reducing the effect of exposure to radiation in places such as radiation labs, nuclear reactors, radiotherapy facilities, industries involving radiation, etc., is essential for the health of radiation workers. In such cases materials having flexibility added with high attenuation coefficient of radiation is required for manufacturing wearables. Eve...

Triboelectric nanogenerators (TENGs) have emerged as a promising alternative for powering small-scale electronics without relying on traditional power sources, and play an important role in the development of the Internet of Things (IoTs). Herein, a low-cost, flexible polyvinyl alcohol (PVA)-based TENG (PVA-TENG) is reported to harvest low-frequenc...

The development of biopolymers-based high-performance triboelectric nanogenerators (TENGs) for powering innovative electronics is crucial for green energy technologies. Herein, a novel TENG composed of polyvinyl alcohol (PVA) functionalized with electron-donating groups from Clitoria ternatea (CT) flower extract is proposed. The compatibility of co...

Triboelectric nanogenerator (TENG) is an energy harvesting technology from widespread mechanical energy based on the combined effects of triboelectrification and electrostatic induction. TENG devices are promising to be integrated into human daily life and their stability in the ambient environment is quite crucial to guarantee robust output. This...

Metal-doped cerium oxide has gained the attention of worldwide researchers due to its facile features and enormous applications in broad fields. Herein, Zn doped cerium oxide nanoparticles of various molar concentrations from 1 to 11 mol% are synthesized by versatile solution combustion synthesis using Tulsi leaf extract as a reducing agent. The na...

Triboelectric nanogenerators (TENGs) as self‐powered devices are a promising solution for powering sensors of the ever‐expanding IoT. However, this potential will be fulfilled only if robust and efficient TENGs are fabricated with economical materials. Herein, we propose a simple, and facile approach for fabricating flexible, economical polypropyle...

EngA, a GTPase contains two GTP binding domains [GD1, GD2], and the C-terminal KH domain shown to be involved in the later stages of ribosome maturation. Association of EngA to the ribosomal subunit in the intermediate stage of maturation is essential for complete ribosome maturation. However, this association was shown to be dependent on the nucle...

The rapid progress in the field of wearable and portable devices has attracted the scientific community to develop flexible triboelectric nanogenerators (TENG) as a promising power source. We report, a cost-effective, fully-flexible, contact-separation mode TENG using polyvinyl chloride (PVC). From hand-tapping, the device generated significant out...

In the present communication, BaFe2O4 (BFO) nanoparticles were synthesized by solution combustion method using urea as a fuel and calcined at 500 °C for 3 h. To know the phase purity, functional group, surface morphology, structural analysis and energy band gap, the synthesized sample was characterized by using the techniques such as powder X-ray d...

In the present communication, NiFe2O4 (NFO) nanoparticles (NPs) are synthesized by using solution combustion method. To know the phase purity, functional group, surface morphology, structural analysis and energy band gap, the synthesized sample was characterized by using the techniques such as powder X-ray diffraction (PXRD), Scanning electron micr...

Ribosome biogenesis GTPase A (RbgA) is involved in the late steps of the 50S ribosomal subunit maturation by binding into the 45S pre-ribosomal subunit. The association of RbgA to the 45S intermediate subunit depends on its bound nucleotide (GTP/GDP), probably because of the conformational shifts that occur between the GTP and GDP bound states. How...

Herein we report simple pyridinium (1–3) and quinolinium (4) salts for the selective recognition of G-quadruplexes (G4s). Among them, the probe 1, interestingly, selectively discriminated parallel (c-KIT-1, c-KIT-2, c-MYC) G4s from anti-parallel/hybrid (22AG, HRAS-1, BOM-17, TBA) G4s at pH 7.2, through a switch on response in the far-red window. Si...

The present study reports the effects of 650-keV Ar 2+ ion irradiation on the structural, optical, and device characteristics of Ru|Pt|n-GaN Schottky barrier diodes (SBDs). Ion irradiation induces the broadening of the GaN X-ray diffraction peaks due to induced structural deformities. The photoluminescence spec-troscopy intensity decreases with the...

Remote and not in-flux gamma irradiation effects have been examined on the cumulative dose ranges from 250 Gy to 1 kGy by current-voltage (I–V) and capacitance-voltage (C-V) characteristics for Ni/n-GaN Schottky barrier diodes (SBDs). The interface and charge transport properties of Ni/n-GaN SBDs are significantly changed after gamma irradiation. I...

EngA, a GTPase involved in the late steps of ribosome maturation, consists of two GTP binding domains (G-domains) [GD1, GD2] and a C-terminal domain. The combination of GTP/GDP in G-domains dictates its binding to the ribosomal subunits by altering its conformation. Studies and comparisons on the available structures of EngA enable us to understand...

The irradiation effects of carbon and nitrogen medium energy ions (MEI) on charge transport, structural and optical properties of Ni/Pd/n-GaN Schottky barrier diodes are reported. The devices are exposed to 600 keV C2+ and 650 keV N2+ ions in the fluence range of 1 × 1013 to 1 × 1015 ions cm−2. The SRIM/TRIM simulations provide quantitative estimat...

Essential Neisserial GTPase A (EngA) is a member of the TRAFAC class of GTPase superfamily. GTPases are molecular switches that switch between the GTP bound (On) state and the GDP bound (Off) state. This switching regulates many biological functions such as protein synthesis, ribosome biogenesis, cell multiplication etc. GTPases possess four highly...

Developing an eco-friendly, flexible and recyclable micro-structured dry electrode for sustainable life is essential. In this work, we have developed irregular, micro-structured sandpaper coated with graphite powder as an electrode for developing a simple, low-cost, contact-separation mode graphite-coated sandpaper-based triboelectric nanogenerator...

This study includes gamma radiation shielding characteristics such as linear attenuation coefficient, mass attenuation coefficient and half value thickness of ten different wood samples collected from various regions of Mysuru district, Karnataka, India. Intensity measurements were made using NaI (Tl) Scintillation detector in narrow beam geometry,...

Transfer method of chemically vapor deposition graphene is an appealing issue to realize its application as flexible and transparent electrodes. A universal stamping method to transfer as grown graphene from copper onto different flexible and transparent polymers (FTPs) reported here ensures simple, robust, rapid, clean and low-cost. This method re...

Effect of high dose Gamma irradiation on Electrical Properties of GaAs infrared emitting diode (IRED)

This review is an audit of various Carbon fibers (CF) surface modification techniques that have been attempted and which produced results with an enhancement in the interfacial characteristics of CFRP systems. An introduction to the CF surface morphology, various techniques of modifications, their results and challenges are discussed here. CFs are...

In the present study we have performed 10ns Molecular Dynamics (MD) simulations for Bacillus Subtilis (BS) RbgA in its apo form and different guanine nucleotide bound (GTP, GDP and GTPγS)form in presence of Mg2+ ion to understand nucleotide dependent conformational changes of RbgA. Analysis of our simulated results shows significant conformational...

The radiation response of Si photo detectors has been studied through Current voltage (I-V) and Capacitance Voltage (C-V) measurements for accumulated high doses of Co-60 gamma rays in the wide range of 1 Mrad to 100 Mrad. The key electrical parameters such as ideality factor (n), series resistance (RS) and reverse leakage current (IR) has been ext...

Effect of High Dose Gamma Irradiation on Electrical Properties of commercial GaN and GaAs based Optoelectronic Devices have been studied

The glass resistive plate chamber (RPC) detector materials were exposed to 8 MeV electron beam from 20 to 100 kGy in steps of 20 kGy. In order to study the electron beam irradiation-induced effects in glass RPC detector material, positron annihilation lifetime spectroscopy (PALS), X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectr...

Effect of high dose Gamma irradiation on Electrical Properties of CdTe/CdS Solar Cells

The upcoming 50 kt magnetized iron calorimeter (ICAL) detector at the India-based Neutrino Observatory (INO) is designed to study the atmospheric neutrinos and antineutrinos separately over a wide range of energies and path lengths. The primary focus of this experiment is to explore the Earth matter effects by observing the energy and zenith angle...

Resistive Plate Chamber (RPC) detector materials viz., Asahi and Saint Gobain float glasses were exposed to 500 keV and 1 MeV oxygen ions at diverse fluences. Positron Annihilation Lifetime Spectroscopic (PALS) investigations were carried out to explore the ion implantation induced microstructural modifications in these glasses. Positron lifetime p...

Objectives: 1.To investigate the relationship between nasal morphology in relation to sagittal and vertical maxillary skeletal pattern and 2.To know the relationship between the degree of upturn of the nose and the inclination of the palatal plane. Materials and Methods: Pretreatment lateral cephalograms of 60 adults of age 18-27 years with no prev...

The investigation of radiation damage in Si microelectronic circuitry and devices are being carried out by various research groups globally. In particular the Si Bipolar junction transistors are very sensitive to high energetic radiation. In the present study, radiation response of NPN Bipolar junction transistor (2N3773) has been examined for 60 M...

The effect of 150 MeV Ag9+ ion irradiation on electrical characteristics of Si photo detectors has been analyzed through in-situ Current voltage (I-V) and Capacitance voltage (C-V) measurements. Ideality factor (n), series resistance (Rs) and reverse leakage current (IR) are extracted from I-V characteristics. The value of n for pristine detector i...

The impact of 30MeV boron 4+ and 60MeV oxygen8+ ion irradiation on electrical characteristics of 2N3773 Si NPN Bipolar junction transistors (BJTs) is reported in the present study. The transistors were decapped and irradiated at room temperature. Gummel characteristics, DC current gain and Capacitance-voltage (C-V) characteristics were studied befo...

The upcoming 50 kt magnetized iron calorimeter (ICAL) detector at the India-based Neutrino Observatory (INO) is designed to study the atmospheric neutrinos and antineutrinos separately over a wide range of energies and path lengths. The primary focus of this experiment is to explore the Earth matter effects by observing the energy and zenith angle...

The influence of 100 MeV Silicon (Si) ion irradiation on electrical characteristics of Si photo detectors has been analyzed using in-situ current-voltage characterization (I-V) in dark condition. The irradiation was performed over a wide range of fluences from 1×1011 ions/cm2 to 1×1013 ions/cm2. Key electrical parameters such as ideality factor (n)...

The radiation response of npn Bipolar junction transistor (BJT) has been examined for 100 MeV O7+ ion. Key electrical properties like Gummel characteristics, dc current gain and capacitance–voltage of 100MeV O7+ ion irradiated transistor were studied before and after irradiation. The device was decapped and the electrical characterizations were...

We report here a simple Compton scattering experiment which may be carried out in graduate and undergraduate laboratories to determine the rest mass energy of the electron. In the present experiment, we have measured the energies of the Compton scattered gamma rays with a NaI(Tl) gamma ray spectrometer coupled to a 1 K multichannel analyzer at five...

K-shell fluorescence yields were measured for the elements Ti, V, Co, Ni, Cu, Zn, As, Se, Sr, Y, Zr, Mo, Ag, Cd, In, Sn and Te excited by 14.4 and 122 keV photons from a 57Co source. A high resolution Si–PIN diode detector was used to detect the X-ray intensity. The measured values were compared with the theoretical, semi-empirical and other availa...

The effective atomic numbers and electron densities of the amino acids glycine, alanine, serine, valine, threonine, leucine, isoleucine, aspartic acid, lysine, glutamic acid, histidine, phenylalanine, arginine, tyrosine, tryptophane and the sugars arabinose, ribose, glucose, galactose, mannose, fructose, rhamnose, maltose, melibiose, melezitose and...

The differential incoherent scattering cross sections for 661.6keV photons have been measured with an HPGe detector in the momentum range 4⩽x⩽46Å-1 for the rare earth elements Nd, Sm, Gd, Dy, Er and Yb. The incoherent scattering functions were evaluated from the measured cross sections and compared with the NRHF values of Hubbel et al. [1975, J. Ph...

The incoherent scattering functions were calculated from the measured differential incoherent scattering cross sections for 661.6 keV photons with a hyper pure germanium detector in the angular range of 5-120 degrees covering the momentum range 2 angstrom(-1) <= q <= 46 angstrom(-1) for iron, copper, zirconium, tin, tantalum, tungsten, gold and lea...

Photon mass attenuation coefficients of some thermoluminescent dosimetric (TLD) compounds, such as LiF, CaCO3, CaSO4, CaSO4.2H2O, SrSO4, CdSO4, BaSO4, C4H6BaO4 and 3CdSO4.8H2O were determined at 279.2, 320.07, 514.0, 661.6, 1115.5, 1173.2 and 1332.5 keV in a well-collimated narrow beam good geometry set-up using a high resolution, hyper pure german...

The K-shell X-ray fluorescence cross sections are determined experimentally for 10 elements such as Pb, Hg, Ir, W, Lu, Tm, Dy, Tb, Gd and Nd at excitation energy of 661.6 keV associated with γ-rays of 137Cs radioisotope. The technique employed involves the measurement of total intensity of fluorescent K X-rays that follow the photoeffect absorption...

The total attenuation cross sections of the elements copper, zirconium, silver, and tin have been measured experimentally in a narrow beam good geometry set up by employing a high-resolution hyperpure germanium detector in the energy range 5 to 85 keV. The data have been used to derive the K-shell photoeffect cross sections at the K-edge, the oscil...