1,119 research outputs found
Corrigendum: Production of biopolyamide precursors 5-amino valeric acid and putrescine from rice straw hydrolysate by engineered Corynebacterium glutamicum
No full textSasikumar K, Hannibal S, Wendisch VF, Nampoothiri KM. Corrigendum: Production of biopolyamide precursors 5-amino valeric acid and putrescine from rice straw hydrolysate by engineered Corynebacterium glutamicum. Frontiers in Bioengineering and Biotechnology. 2025;13: 1588115
Template-free nanostructured poly-3-hexylthiophene (P3HT) films via single pulse-nucleated electrodeposition
No full textA template-free method for the electrochemical deposition of poly(3-hexylthiophene) (P3HT) has been demonstrated. Electrodeposition is preceded by an electrochemical nucleation step, which is essential in producing an even film over the electrode surface without needing any pre-treatment of the electrode surface through surface coatings or self-assembled monolayers. The produced film is highly nanostructured, being made up of interconnected wire-like structures on the order of 100 nm, and readily delaminates as an intact film for straightforward analysis. The films are also highly conductive without needing post-treatment or chemical dopants. This technique offers a simple route to conductive organic films for thermoelectric generators, organic solar cells or field effect transistors
Influence of needle-like morphology on the bioactivity of nanocrystalline wollastonite – an in vitro study
No full textR Lakshmi, S Sasikumar Materials Chemistry Division, School of Advanced Sciences, VIT University, Vellore, Tamil Nadu, India Abstract: In the past 2 decades, wollastonite has been studied thoroughly for its application as a bone implant material due to its biocompatibility, high mechanical strength, and excellent bioactivity when compared to calcium phosphates bioceramics. Wollastonite was prepared through the low-temperature sol-gel combustion method using urea as the fuel, nitrate ions and nitric acid as the oxidizer. Calcium nitrate and tetraethyl orthosilicate were taken as the source of calcium and silica. The synthesized wollastonite were characterized by Fourier transform infrared spectroscopy for the identification of characteristic functional group and powder X-ray diffraction for the phase identification. Employing urea as a fuel resulted in needle-like morphology of the particles, which was confirmed by scanning electron microscopy and transmission electron microscopy. It was observed that the needle-like morphology enhances the mechanical properties such as elasticity and compressive strength and also increases the surface area of the material, which could help in a rapid deposition of hydroxyapatite layer. These properties of wollastonite warrant its application as a new artificial bone material in the field of hard tissue engineering. Keywords: sol-gel combustion synthesis, bioceramics, hydroxyapatite, compressive strength, morpholog
Regression of oxidative stress by targeting eNOS and Nrf2/ARE signaling: a guided drug target for cardiovascular diseases
No full textCardiovascular diseases (CVDs) are the major health concern and the leading cause of death. Imbalance between free radicals and anti-oxidant defence is associated with cellular dysfunctions leading to the pathophysiology of various diseases including cardiac and vascular diseases. The stress responsive transcription factor NF-E2-related factor 2/antioxidant response element (Nrf2/ARE) regulates the expression of many detoxifying genes. Nitric oxide (NO) produced by endothelial nitric oxide synthase (eNOS) is an important regulator of vascular function. Involvement of NO in modulating Nrf2 signaling is well established. Thus, it is apparent that increasing NO bioavailability and antioxidant status in vascular and myocardial tissue can be considered as a potential strategy to prevent the onset of vascular dysfunction and CVDs and is therefore of therapeutical interest. Based on the marked protective effect of Nrf2/ARE signalling and intriguing links between antioxidant mechanism and endothelial derived NO, the aim of the present review is to compile conclusive evidence for the involvement of NO-Nrf2/ARE axis in the regulation of cardiovascular function. This review also discusses on improving eNOS and Nrf2 signalling by Nrf2 activators which holds promise for countering cardiac and vascular disorders
Dataset supporting the publication "Solution-processed flexible thermoelectric nanocomposites based on P3HT/tellurium nanowires for smart applications" by S. Arumugam et al
No full textDataset supporting the publication "Solution-processed flexible thermoelectric nanocomposites based on P3HT/tellurium nanowires for smart applications" by S. Arumugam et al (2023) published in Synthetic Metals issn 0379-6779.
In this work, we fabricate a novel type of thermoelectric composite by mixing high-mobility poly(3,4-ethylene dioxythiophene), P3HT with tellurium nanowires (TeNW) and newly synthesized three different (S2-, SET and SPh) sulfur-contained tellurium nanowires. The advantage of the presence of sulfur in the hybrid film is to prevent aggregation and the ability to dissolve in polar solvents. The thermoelectric properties are investigated by varying the loading of tellurium nanowires into the polymer matrix. The spin coating method is used to fabricate the thermoelectric devices on Quartz substrates. We achieved a maximum power of 47.7μW/mk2, the highest reported for tellurium/P3HT nanowire composites. The results of this study also indicate that the doping of P3HT increases the thermoelectric properties of hybrid composites. The thickness of the hybrid thin films was investigated using SEM images.
Related projects:
EP/T027711/1 - Flexible Hybrid Thermoelectric Materials
The DOI for this data will become available once the paper has been published by Synthetic Metals issn 0379-6779
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Supplemental Material - A study on development of silicone rubber with conductive carbon, polyaniline, MWCNT composite for EMI shielding
No full textSupplemental Material for A study on development of silicone rubber with conductive carbon, polyaniline, MWCNT composite for EMI shielding by J Jayakanth, K Chennakesavulu, G Ramanjaneya Reddy, S Dhanalakshmi, V Priya, K Sasikumar and T Sasipraba in High Performance Polymers</p
Data for 'Encapsulated Textile Organic Solar Cells Fabricated by Spray Coating'
No full textThis data supports the paper Li, Y., Arumugam, S., Krishnan, C., Charlton, M., & Beeby, S. (2018). Encapsulated Textile Organic Solar Cells Fabricated by Spray Coating.
Solution based processes such as screen printing and spray coating are established processes for fabricating organic solar cells (OSCs) on flexible polymer substrates. However, realizing a flexible solar cell on a textile substrate remains a significant challenge due to the properties of the textile itself, which can present an absorbent, rough and fibrous surface. The textile also limits processing temperatures which can reduce functional materials performance. In this work, we demonstrate an optimized fabrication approach using entirely spray coating to fabricate textile OSCs with a power conversion efficiency (PCE) of 0.4 %. An interface layer is first deposited on the standard woven textile that forms a smooth supporting layer for the subsequent spray coated functional layers. A top encapsulation layer is deposited on top of the fabricated textile OSCs, which improves the durability and life time of the OSCs is evidenced by cyclic bending test.</span
Addressing the Node Discovery Problem in Fog Computing
No full textIn recent years, the Internet of Things (IoT) has gained a lot of attention due to connecting various sensor devices with the cloud, in order to enable smart applications such as: smart traffic management, smart houses, and smart grids, among others. Due to the growing popularity of the IoT, the number of Internet-connected devices has increased significantly. As a result, these devices generate a huge amount of network traffic which may lead to bottlenecks, and eventually increase the communication latency with the cloud. To cope with such issues, a new computing paradigm has emerged, namely: fog computing. Fog computing enables computing that spans from the cloud to the edge of the network in order to distribute the computations of the IoT data, and to reduce the communication latency. However, fog computing is still in its infancy, and there are still related open problems. In this paper, we focus on the node discovery problem, i.e., how to add new compute nodes to a fog computing system. Moreover, we discuss how addressing this problem can have a positive impact on various aspects of fog computing, such as fault tolerance, resource heterogeneity, proximity awareness, and scalability. Finally, based on the experimental results that we produce by simulating various distributed compute nodes, we show how addressing the node discovery problem can improve the fault tolerance of a fog computing system
Demonstration of circular shunt in fetal Ebstein anomaly
No full textEbstein′s anomaly was diagnosed in a fetus at 24 weeks of gestation. There was significant cardiomegaly and severe tricuspid regurgitation (TR). There was functional pulmonary atresia with severe pulmonary regurgitation (PR) and this was causing a circular shunt. There was no fetal hydrops
Synthesis, Structure and Reactivity of Hydrated and Dehydrated Organotin Cations
No full textMonomeric organotin dications {[nBu2Sn(H2O)4]2+·2C6H5SO3-} and {[nBu2Sn(H2O)4]2+·1,5-C10H6(SO3-)2} have been synthesized by the reaction of [nBu2SnO]n and the corresponding arylsulfonic acid. Dodecanuclear organooxotin macrocations {[(nBuSn)12(μ 3-O)14(μ 2-OH)6]2+·2RSO3-} (R = C6H5; 2,5-Me2C6H3) have been synthesized by the reaction of nBuSn(O)(OH) and the corresponding arylsulfonic acid. The X-ray crystal structure of one of the dodecanuclear cages is reported. These organotin cations have been shown to be effective catalysts in acetylation and transacetylation reactions
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