Article
Electrochemistry
Sang-Soon Jang, Se-Kook Park, Sun-Hwa Yeon, Kyoung-Hee Shin, Haneul Song, Han-Su Kim, Yoon-Seok Jung, Chang-Soo Jin
Summary: Nitrate serves as a promising counter-anion for methyl viologen, leading to enhanced solubility and electrochemical reversibility, resulting in superior performance in aqueous redox flow batteries.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Plant Sciences
Ceyda Ozfidan-Konakci, Evren Yildiztugay, Busra Arikan, Fevzi Elbasan, Fatma Nur Alp, Mustafa Kucukoduk
Summary: This study evaluated the potential mechanisms of sodium hydrosulfide hydrate in combating methyl viologen-induced oxidative stress in Arabidopsis thaliana. The results showed that sodium hydrosulfide hydrate could alleviate stress-induced growth inhibition and improve photosynthetic ability by regulating gene expression and antioxidant capacity.
JOURNAL OF PLANT GROWTH REGULATION
(2023)
Article
Chemistry, Physical
Lei Liu, Yanxin Yao, Zengyue Wang, Yi-Chun Lu
Summary: By utilizing alpha-CD as a molecular spectator, the intermolecular interaction of viologen radicals in AORFBs can be weakened and dimerization can be suppressed, leading to improved cycling life and stability. Experimental results show that using alpha-CD significantly reduces capacity decay rate and achieves long-term stable cycling for AORFBs.
Article
Chemistry, Physical
Patrick T. Sullivan, Honghao Liu, Xiu-Liang Lv, Song Jin, Wenjie Li, Dawei Feng
Summary: Aqueous organic redox flow batteries (AORFBs) are a promising technology for safe grid energy storage. However, designing organic redox molecules with desired properties while remaining scalable is challenging. This study demonstrates the adaptability of a single-step hydrothermal reaction for nine viologen chloride salts and offers new insights into structure-property relationships. A new Dex-DiOH-Vi derivative with enhanced solubility and stability exhibits stable cycling performance in anolyte-limiting AORFB. This work highlights the importance of efficient synthetic approaches for high-performance flow battery electrolytes.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Wenda Wu, Abigail P. P. Wang, Jian Luo, T. Leo Liu
Summary: This study reports a carboxylate functionalized viologen derivative as a highly stable, high capacity anolyte material under near pH neutral conditions. Experimental and computational studies revealed the high solubility and negative reduction potential of the molecule, resulting in exceptional energy storage performance in high-performance flow batteries.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Aleksandr Korshunov, Anna Gibalova, Mariano Gruenebaum, Bart Jan Ravoo, Martin Winter, Isidora Cekic-Laskovic
Summary: The introduction of secondary noncovalent interactions along with primary modifications can enhance the overall performance of electrolytes for redox flow batteries. Through the formation of host-guest complexes between tailored viologens and highly water soluble cyclodextrin, significant improvements in electrochemical properties were achieved. By screening different combinations of viologen substituents in the presence of cyclodextrin, an electrochemically stable performance was demonstrated for more than 500 cycles with high energy and Coulombic efficiencies. This selective interplay between supporting electrolytes and engineered redox active materials shows promise for enhancing energy characteristics of AORFB electrolytes.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Liwen Wang, Mingbao Huang, Kai Wan, Zhiyong Fu, Zhipeng Xiang, Zhenxing Liang
Summary: This study develops a highly soluble bipolar redox-active organic molecule by covalently coupling the TEMPO and viologen moieties, which effectively improves the stability and capacity decay issue in flow batteries.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Sandra de la Parra, Juan Antonio Tamayo-Ramos, Ruben Rubio-Presa, Daniel Perez-Antolin, Virginia Ruiz, Roberto Sanz, Carlos Rumbo, Edgar Ventosa
Summary: This study demonstrates the different cytotoxicity and toxicology of a series of viologen derivatives through in vitro assays using model organisms. The results show that safe viologen derivatives can be molecularly engineered, offering a promising choice of negolyte materials for neutral redox flow batteries.
Article
Chemistry, Multidisciplinary
Weier Liu, Linghui Kong, Mao Quan, Huan Yao, Liupan Yang, Ho Yu Au-Yeung, Wei Jiang
Summary: In this study, an endo-functionalized naphthobox was reported to exhibit highly selective binding towards methyl viologen over other analogues. X-ray single crystal structure and Density Functional Theory (DFT) calculations revealed that the endo-functionalized groups in the cavity of the naphthobox played a crucial role in achieving the high binding selectivity through multiple C-H···N, C-H···π, and π···π interactions with methyl viologen.
CHINESE CHEMICAL LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Ting Song, Geng Yang, Hanxi Zhang, Mengyue Li, Wanyi Zhou, Chuan Zheng, Fengming You, Chunhui Wu, Yiyao Liu, Hong Yang
Summary: This study constructed a GSH-depleting magnetic nanoplatform (D@MOs-P) that enhances ferroptosis by disrupting redox homeostasis and ferritinophagy-mediated iron disorders. The D@MOs-P platform utilizes disulfide bond-mediated glutathione depletion and magnetic hyperthermia to disrupt redox homeostasis and induce ferritinophagy, leading to intense ferroptosis of tumor cells. In vitro and in vivo results demonstrate that D@MOs-P effectively suppresses tumor growth with minimal side effects. This research also highlights the potential of magnetic nanoparticles for T2-weighted MR imaging.
Article
Chemistry, Multidisciplinary
Zhipeng Xiang, Wenjin Li, Kai Wan, Zhiyong Fu, Zhenxing Liang
Summary: This work develops an electrochemical method to quantitatively study the aggregation behavior of methyl viologen dichloride molecules and finds that aggregation behavior can effectively regulate the molecule's energy level and redox potential. It not only provides a method to investigate molecular aggregation, but also demonstrates the feasibility to tune the performance of redox flow batteries by regulating aggregation behavior.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Multidisciplinary
Ruben Rubio-Presa, Lara Lubian, Mario Borlaf, Edgar Ventosa, Roberto Sanz
Summary: In the presence of traces of oxygen, viologen-derivatives in redox flow batteries undergo accelerated degradation. We have identified the primary degradation mechanism and proposed a cost-effective and efficient method to evaluate the stability of viologen-derivatives in relation to this degradation. Through molecular engineering, we have synthesized a new viologen-derivative with improved stability by introducing an alkylsulfonate chain with a secondary carbon center joined to the N atom.
ACS MATERIALS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Parastoo Dalvand, Katia Nchimi Nono, Dinesh Shetty, Farah Benyettou, Zouhair Asfari, Carlos Platas-Iglesias, Mark A. Olson, Ali Trabolsi, Mourad Elhabiri
Summary: Two calix[4]arene systems can form [3]pseudorotaxanes when combined with CB[7] or CB[8], while [2]pseudorotaxanes based on CB[7] and CB[8] do not undergo decomplexation and dimerization under certain conditions.
Article
Biochemistry & Molecular Biology
Kristell Le Gal, Edward E. Schmidt, Volkan Sayin
Summary: Cellular redox homeostasis is crucial for balancing the reducing and oxidizing reactions within cells, regulating various biological responses and events. Despite the challenges in studying these biochemical reactions, recent advancements in technology have rapidly expanded the redox field, enhancing our understanding of its significance in biology. This short review aims to provide an overview of redox regulation in cellular signaling, development, and disease, as well as introduce some recent discoveries in these areas.
Article
Electrochemistry
Meisam Bahari, Gerald D. Watt, John N. Harb
Summary: Asymmetric viologen-based compound MMV shows promise as a redox active compound in ARFBs, with high solubility and low redox potential, but poor cycling performance at high concentrations. The issue could potentially be resolved by synthesizing asymmetric MMV derivatives with higher charge.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Plant Sciences
Bobba Sunil, Pidakala Rajsheel, Vetcha Aswani, Ramesh B. Bapatla, Sai K. Talla, Agepati S. Raghavendra
JOURNAL OF PLANT PHYSIOLOGY
(2020)
Article
Plant Sciences
B. Sunil, R. J. Strasser, A. S. Raghavendra
Review
Plant Sciences
Sarada D. Tetali, Satyabrata Acharya, Aditya B. Ankari, Vadthyavath Nanakram, Agepati S. Raghavendra
Summary: Withania somnifera, commonly known as Indian ginseng, has been extensively used in Ayurveda for various health benefits. Metabolomic studies have shown that the metabolite profiles of W. somnifera vary depending on plant parts collected, developmental stage, season, and geographical location. The use of sophisticated techniques like LC-MS, GC-MS, HPTLC, and NMR has facilitated the discovery of new metabolites and comprehensive metabolomic profiles.
JOURNAL OF ETHNOPHARMACOLOGY
(2021)
Review
Plant Sciences
Pulimamidi Bharath, Shashibhushan Gahir, Agepati S. Raghavendra
Summary: Abscisic acid (ABA) plays a multifaceted role under stress conditions, including plant defense through stomatal closure, interaction with other hormones, and promotion of long-term adaptive measures. The rise in signaling components triggered by ABA can lead to additional events involved in protecting the cell, triggering defense responses, and delaying pathogen spread and infection within leaves. Stomatal closure and other ABA influences are crucial early steps in defense mechanisms and important components of plants' innate immunity response. Further research on ABA-induced stomatal closure mechanism can aid in designing strategies for plant/crop adaptations to stress.
FRONTIERS IN PLANT SCIENCE
(2021)
Article
Plant Sciences
Ramesh B. Bapatla, Deepak Saini, Vetcha Aswani, Pidakala Rajsheel, Bobba Sunil, Stefan Timm, Agepati S. Raghavendra
Summary: The study reveals the important interactions between different organelles in the photorespiratory pathway, with MD playing a crucial role in modulating the redox state.
Article
Pharmacology & Pharmacy
Poonam Kulyal, Satyabrata Acharya, Aditya B. Ankari, Praveen K. Kokkiripati, Sarada D. Tetali, Agepati S. Raghavendra
Summary: The phytochemical profiles of seven cultivars of Curcuma longa L. and C. aromatica Salisb. were compared, revealing significant variability. A total of 39 new compounds were detected, some of which have health benefits.
FRONTIERS IN PHARMACOLOGY
(2021)
Article
Plant Sciences
Shashibhushan Gahir, Pulimamidi Bharath, Agepati S. Raghavendra
FRONTIERS IN PLANT SCIENCE
(2021)
Article
Plant Sciences
Jayendra Pandey, Elsinraju Devadasu, Deepak Saini, Kunal Dhokne, Sureshbabu Marriboina, Agepati. S. S. Raghavendra, Rajagopal Subramanyam
Summary: This study found that the effects of drought on photosynthesis have been extensively studied, but the effects on thylakoid organization are limited. The research observed a significant decline in gas exchange parameters and a reduction of photochemical efficiency of photosystem II and I in pea leaves under progressive drought stress. Furthermore, the study found changes in the organization of light-harvesting complexes and reductions in supercomplexes of thylakoids in drought-affected plants.
Editorial Material
Plant Sciences
Agepati S. Raghavendra, Wenxiu Ye, Toshinori Kinoshita
FRONTIERS IN PLANT SCIENCE
(2023)
Article
Plant Sciences
Deepak Saini, Ramesh B. Bapatla, Jayendra Pandey, Vetcha Aswani, Bobba Sunil, Shashibhushan Gahir, Pulimamidi Bharath, Rajagopal Subramanyam, Agepati S. Raghavendra
Summary: The effects of nitric oxide (NO) on the photochemical components of leaves are unclear. This study investigates the changes caused by a natural NO donor, S-nitrosoglutathione (GSNO), on Pisum sativum leaves under different light conditions. It was found that GSNO increased NO levels in the leaves, particularly under high light intensity. The treatment with GSNO inhibited photosynthesis and restricted electron transport, with a stronger effect on PSII components than PSI. The study suggests that NO worsens the inhibition of photosynthesis and dark respiration induced by high light.
PLANT SCIENCE TODAY
(2023)
Article
Plant Sciences
Sai Krishna Talla, Bobba Sunil, Duvvarapu Easwar Rao, Pidakala Rajsheel, Deepak Saini, Agepati S. Raghavendra
Summary: We studied the effects of different concentrations of bicarbonate on photosynthesis in Arabidopsis thaliana mesophyll protoplasts. The photosynthetic rate was highest at 1 mM bicarbonate and decreased at higher concentrations. We found that exposure to supra-optimal bicarbonate caused oxidative stress in wild-type protoplasts, but the nadp-mdh mutant had a higher photosynthetic rate and greater sensitivity to high bicarbonate, while the vtc1 mutant had a low photosynthetic rate and no significant inhibition. We concluded that the inhibition of photosynthesis at supra-optimal bicarbonate levels depends on the redox state of mesophyll protoplasts and that the antioxidant enzyme systems in the nadp-mdh mutant may play a role in sustaining high photosynthesis under these conditions.
JOURNAL OF PLANT PHYSIOLOGY
(2023)
Article
Plant Sciences
Deepak Saini, Ramesh B. Bapatla, Chandra Kaladhar Vemula, Shashibhushan Gahir, Pulimamidi Bharath, Kapuganti Jagadis Gupta, Agepati S. Raghavendra
Summary: When plants are under water stress, photosynthesis is reduced due to increased reactive oxygen species (ROS) and nitric oxide (NO). However, photorespiratory metabolism protects photosynthesis and maintains yield. This study investigated the impact of externally added NO, using a natural NO donor called S-nitrosoglutathione (GSNO), on photorespiratory metabolism in pea plant leaves. The results showed that GSNO increased NO accumulation and resulted in nitrosative stress in the leaves. However, the changes in photorespiratory enzymes caused by GSNO were minimal compared to those under high light conditions. Therefore, it is likely that ROS, rather than NO, is the key regulator of photorespiration.
Article
Biochemistry & Molecular Biology
Vijay Kumar Dalal, Ajay K. Biswal, Dhaval Pate, Rajagopal Subramanyam, Agepati S. Raghavendra
Summary: Stressed plants can survive by favoring certain pathways, and protection of enzymes through proline and other osmolytes is one such mechanism. This study investigated the influence of proline on conformational changes of various proteins caused by hydrogen peroxide. The results showed that proline can reduce conformational changes and protein aggregation induced by H2O2.
INDIAN JOURNAL OF BIOCHEMISTRY & BIOPHYSICS
(2022)
