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Govindan MD S, Ravi S, Ekambaram S, Ganesan K. WCN23-0413 COMPARISON OF RISK FACTORS, CLINICAL CHARACTERISTICS AND SHORT-TERM CLINICAL OUTCOME OF URINARY TRACT INFECTIONS IN CHILDREN CAUSED BY NON- ESBL AND ESBL PRODUCING BACTERIA. Kidney Int Rep 2023. [DOI: 10.1016/j.ekir.2023.02.198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/22/2023] Open
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Nabihah Nasir N, Sekar M, Ravi S, Wong LS, Sisinthy SP, Gan SH, Subramaniyan V, Chidambaram K, Mat Rani NNI, Begum MY, Ramar M, Safi SZ, Selvaraj S, Chinna Maruthu SK, Fuloria S, Fuloria NK, Lum PT, Djearamane S. Chemistry, Biosynthesis and Pharmacology of Streptonigrin: An Old Molecule with Future Prospects for New Drug Design, Development and Therapy. Drug Des Devel Ther 2023; 17:1065-1078. [PMID: 37064433 PMCID: PMC10094529 DOI: 10.2147/dddt.s388490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Accepted: 01/20/2023] [Indexed: 04/18/2023] Open
Abstract
Streptonigrin is an aminoquinone alkaloid isolated from Streptomyces flocculus and is gaining attention as a drug molecule owing to its potential antitumor and antibiotic effects. It was previously used as an anticancer drug but has been discontinued because of its toxic effects. However, according to the most recent studies, the toxicity of streptonigrin and its structurally modified derivatives has been reduced while maintaining their potential pharmacological action at lower concentrations. To date, many investigations have been conducted on this molecule and its derivatives to determine the most effective molecule with low toxicity to enable new drug discovery. Therefore, the main objective of this study is to provide a comprehensive review and to discuss the prospects for streptonigrin and its derived compounds, which may boost the molecule as a highly interesting target molecule for new drug design, development and therapy. To complete this review, relevant literature was collected from several scientific databases, including Google Scholar, PubMed, Scopus and ScienceDirect. Following a complete screening, the obtained information is summarized in the present review to provide a good reference and accelerate the development and utilization of streptonigrin and its derivatives as pharmaceuticals.
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Affiliation(s)
- Naurah Nabihah Nasir
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Health Sciences, Royal College of Medicine Perak, Universiti Kuala Lumpur, Ipoh, Perak, 30450, Malaysia
| | - Mahendran Sekar
- School of Pharmacy, Monash University Malaysia, Bandar Sunway, Selangor, 47500, Malaysia
- Center for Transdisciplinary Research, Department of Pharmacology, Saveetha Institute of Medical and Technical Sciences, Saveetha Dental College and Hospital, Saveetha University, Chennai, Tamil Nadu, 600077, India
| | - Subban Ravi
- Department of Chemistry, Karpagam Academy of Higher Education, Coimbatore, Tamil Nadu, 641021, India
| | - Ling Shing Wong
- Faculty of Health and Life Sciences, INTI International University, Nilai, 71800, Malaysia
- Correspondence: Ling Shing Wong, Faculty of Health and Life Sciences, INTI International University, Nilai, 71800, Malaysia, Tel +6014 – 3034057, Email
| | - Sreenivas Patro Sisinthy
- Faculty of Pharmacy and Health Sciences, Royal College of Medicine Perak, Universiti Kuala Lumpur, Ipoh, Perak, 30450, Malaysia
| | - Siew Hua Gan
- School of Pharmacy, Monash University Malaysia, Bandar Sunway, Selangor, 47500, Malaysia
| | - Vetriselvan Subramaniyan
- Jeffrey Cheah School of Medicine and Health Sciences, Monash University Malaysia, Bandar Sunway, Subang Jaya, Selangor, Malaysia
| | - Kumarappan Chidambaram
- Department of Pharmacology, College of Pharmacy, King Khalid University, Abha, 62529, Saudi Arabia
| | - Nur Najihah Izzati Mat Rani
- Faculty of Pharmacy and Health Sciences, Royal College of Medicine Perak, Universiti Kuala Lumpur, Ipoh, Perak, 30450, Malaysia
| | - M Yasmin Begum
- Department of Pharmaceutics, College of Pharmacy, King Khalid University, Abha, 61421, Saudi Arabia
| | - Mohankumar Ramar
- Department of Surgical Research, Rhode Island Hospital, Alpert Medical School, Brown University, Providence, RI, 02903, USA
| | - Sher Zaman Safi
- Faculty of Medicine, Bioscience and Nursing, MAHSA University, Jenjarom, Selangor, 42610, Malaysia
| | | | | | - Shivkanya Fuloria
- Faculty of Pharmacy, AIMST University, Bedong, Kedah, 08100, Malaysia
| | | | - Pei Teng Lum
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Health Sciences, Royal College of Medicine Perak, Universiti Kuala Lumpur, Ipoh, Perak, 30450, Malaysia
| | - Sinouvassane Djearamane
- Department of Biomedical Science, Faculty of Science, Universiti Tunku Abdul Rahman, Kampar, Perak, 31900, Malaysia
- Sinouvassane Djearamane, Department of Biomedical Science, Faculty of Science, Universiti Tunku Abdul Rahman, Kampar, 31900, Perak, Malaysia, Tel +6016 – 4037685, Email
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Amir Yusri MA, Sekar M, Wong LS, Gan SH, Ravi S, Subramaniyan V, Mat Rani NNI, Chidambaram K, Begum MY, Ramar M, Safi SZ, Selvaraj S, Wu YS, Revathy P, Fuloria S, Fuloria NK, Lum PT, Djearamane S. Celastrol: A Potential Natural Lead Molecule for New Drug Design, Development and Therapy for Memory Impairment. Drug Des Devel Ther 2023; 17:1079-1096. [PMID: 37064431 PMCID: PMC10093558 DOI: 10.2147/dddt.s389977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Accepted: 02/15/2023] [Indexed: 04/18/2023] Open
Abstract
Celastrol is a naturally occurring chemical isolated from Tripterygium wilfordii Hook. f., root extracts widely known for their neuroprotective properties. In this review, we focus on the efficacy of celastrol in mitigating memory impairment (MI) in both in vivo and in vitro models. Scopus, PubMed and Web of Science databases were utilised to locate pertinent literatures that explore the effects of celastrol in the brain, including its pharmacokinetics, bioavailability, behavioral effects and some of the putative mechanisms of action on memory in many MI models. To date, preclinical studies strongly suggest that celastrol is highly effective in enhancing the cognitive performance of MI animal models, particularly in the memory domain, including spatial, recognition, retention and reference memories, via reduction in oxidative stress and attenuation of neuro-inflammation, among others. This review also emphasised the challenges and potential associated enhancement of medication delivery for MI treatment. Additionally, the potential structural alterations and derivatives of celastrol in enhancing its physicochemical and drug-likeness qualities are examined. The current review demonstrated that celastrol can improve cognitive performance and mitigate MI in several preclinical investigations, highlighting its potential as a natural lead molecule for the design and development of a novel neuroprotective medication.
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Affiliation(s)
- Muhamad Azrul Amir Yusri
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Health Sciences, Royal College of Medicine Perak, Universiti Kuala Lumpur, Ipoh, Perak, Malaysia
| | - Mahendran Sekar
- School of Pharmacy, Monash University Malaysia, Bandar Sunway, Subang Jaya, Selangor, Malaysia
- Center for Transdisciplinary Research, Department of Pharmacology, Saveetha Dental College, Saveetha Institute of Medical and Technical Sciences, Chennai, India
| | - Ling Shing Wong
- Faculty of Health and Life Sciences, INTI International University, Nilai, Malaysia
- Correspondence: Ling Shing Wong, Faculty of Health and Life Sciences, INTI International University, Nilai, Malaysia, Tel +6014 3034057, Email
| | - Siew Hua Gan
- School of Pharmacy, Monash University Malaysia, Bandar Sunway, Subang Jaya, Selangor, Malaysia
| | - Subban Ravi
- Department of Chemistry, Karpagam Academy of Higher Education, Coimbatore, Tamil Nadu, India
| | - Vetriselvan Subramaniyan
- Jeffrey Cheah School of Medicine and Health Sciences, Monash University Malaysia, Bandar Sunway, Subang Jaya, Selangor, Malaysia
| | - Nur Najihah Izzati Mat Rani
- Faculty of Pharmacy and Health Sciences, Royal College of Medicine Perak, Universiti Kuala Lumpur, Ipoh, Perak, Malaysia
| | - Kumarappan Chidambaram
- Department of Pharmacology, College of Pharmacy, King Khalid University, Abha, Saudi Arabia
| | - M Yasmin Begum
- Department of Pharmaceutics, College of Pharmacy, King Khalid University, Abha, Saudi Arabia
| | - Mohankumar Ramar
- Department of Surgical Research, Rhode Island Hospital, Alpert Medical School, Brown University, Providence, RI, USA
| | - Sher Zaman Safi
- Faculty of Medicine, Bioscience and Nursing, MAHSA University, Bandar Saujana Putra, Jenjarom, Selangor, Malaysia
| | | | - Yuan Seng Wu
- Department of Biological Sciences and Centre for Virus and Vaccine Research, School of Medical and Life Sciences, Sunway University, Subang Jaya, Selangor, Malaysia
| | - Palanisamy Revathy
- Department of Computer Applications, Gobi Arts & Science College, Gobichettipalayam, Tamil Nadu, India
| | | | | | - Pei Teng Lum
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Health Sciences, Royal College of Medicine Perak, Universiti Kuala Lumpur, Ipoh, Perak, Malaysia
| | - Sinouvassane Djearamane
- Department of Biomedical Science, Faculty of Science, Universiti Tunku Abdul Rahman, Kampar, Perak, Malaysia
- Sinouvassane Djearamane, Department of Biomedical Science, Faculty of Science, Universiti Tunku Abdul Rahman, Kampar, Perak, Malaysia, Tel +6016 4037685, Email
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Sathishkumar L, Dhanapal V, Ravi S, Saratha R, Sugumaran N. Compatibility of Lithium ion Phosphate Battery in Solar off Grid Application. J ELECTROCHEM SCI TE 2022. [DOI: 10.33961/jecst.2022.00423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Olagbenro M, Myers D, Ravi S, Xu S, Walter J. 284 A single-arm, prospective clinical study of blue light phototherapy as a novel treatment for Grover’s Disease and psoriasis vulgaris. J Invest Dermatol 2022. [DOI: 10.1016/j.jid.2022.05.292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Nasir NN, Sekar M, Fuloria S, Gan SH, Rani NNIM, Ravi S, Begum MY, Chidambaram K, Sathasivam KV, Jeyabalan S, Dhiravidamani A, Thangavelu L, Lum PT, Subramaniyan V, Wu YS, Azad AK, Fuloria NK. Kirenol: A Potential Natural Lead Molecule for a New Drug Design, Development, and Therapy for Inflammation. Molecules 2022; 27:molecules27030734. [PMID: 35163999 PMCID: PMC8839644 DOI: 10.3390/molecules27030734] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 01/16/2022] [Accepted: 01/20/2022] [Indexed: 12/26/2022]
Abstract
Kirenol, a potential natural diterpenoid molecule, is mainly found in Sigesbeckia species. Kirenol has received a lot of interest in recent years due to its wide range of pharmacological actions. In particular, it has a significant ability to interact with a wide range of molecular targets associated with inflammation. In this review, we summarise the efficacy and safety of kirenol in reducing inflammation, as well as its potential mechanisms of action and opportunities in future drug development. Based on the preclinical studies reported earlier, kirenol has a good therapeutic potential against inflammation involved in multiple sclerosis, inflammatory bowel disorders, diabetic wounds, arthritis, cardiovascular disease, bone damage, and joint disorders. We also address the physicochemical and drug-like features of kirenol, as well as the structurally modified kirenol-derived molecules. The inhibition of pro-inflammatory cytokines, reduction in the nuclear factor kappa-B (NF-κB), attenuation of antioxidant enzymes, stimulation of heme-oxygenase-1 (HO-1) expression, and nuclear factor erythroid 2-related factor 2 (Nrf2) phosphorylation are among the molecular mechanisms contributing to kirenol's anti-inflammatory actions. Furthermore, this review also highlights the challenges and opportunities to improve the drug delivery of kirenol for treating inflammation. According to the findings of this review, kirenol is an active molecule against inflammation in numerous preclinical models, indicating a path to using it for new drug discovery and development in the treatment of a wide range of inflammations.
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Affiliation(s)
- Naurah Nabihah Nasir
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Health Sciences, Royal College of Medicine Perak, University Kuala Lumpur, Ipoh 30450, Perak, Malaysia; (N.N.N.); (P.T.L.)
| | - Mahendran Sekar
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Health Sciences, Royal College of Medicine Perak, University Kuala Lumpur, Ipoh 30450, Perak, Malaysia; (N.N.N.); (P.T.L.)
- Correspondence: (M.S.); (S.F.); (N.K.F.); Tel.: +60-163346653 (M.S.); +60-143034057 (S.F.); +60-164037685 (N.K.F.)
| | - Shivkanya Fuloria
- Faculty of Pharmacy, AIMST University, Bedong 08100, Kedah, Malaysia;
- Correspondence: (M.S.); (S.F.); (N.K.F.); Tel.: +60-163346653 (M.S.); +60-143034057 (S.F.); +60-164037685 (N.K.F.)
| | - Siew Hua Gan
- School of Pharmacy, Monash University Malaysia, Bandar Sunway 47500, Selangor, Malaysia;
| | - Nur Najihah Izzati Mat Rani
- Faculty of Pharmacy and Health Sciences, Royal College of Medicine Perak, University Kuala Lumpur, Ipoh 30450, Perak, Malaysia;
| | - Subban Ravi
- Department of Chemistry, Karpagam Academy of Higher Education, Coimbatore 641021, Tamil Nadu, India;
| | - M. Yasmin Begum
- Department of Pharmaceutics, College of Pharmacy, King Khalid University, Abha 61421, Saudi Arabia;
| | - Kumarappan Chidambaram
- Department of Pharmacology, College of Pharmacy, King Khalid University, Abha 62529, Saudi Arabia;
| | | | - Srikanth Jeyabalan
- Department of Pharmacology, Sri Ramachandra Faculty of Pharmacy, Sri Ramachandra Institute of Higher Education and Research (DU), Porur, Chennai 600116, Tamil Nadu, India; (S.J.); (A.D.)
| | - Arulmozhi Dhiravidamani
- Department of Pharmacology, Sri Ramachandra Faculty of Pharmacy, Sri Ramachandra Institute of Higher Education and Research (DU), Porur, Chennai 600116, Tamil Nadu, India; (S.J.); (A.D.)
| | - Lakshmi Thangavelu
- Center for Transdisciplinary Research, Department of Pharmacology, Saveetha Institute of Medical and Technical Sciences, Saveetha Dental College and Hospital, Saveetha University, Chennai 600077, Tamil Nadu, India;
| | - Pei Teng Lum
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Health Sciences, Royal College of Medicine Perak, University Kuala Lumpur, Ipoh 30450, Perak, Malaysia; (N.N.N.); (P.T.L.)
| | - Vetriselvan Subramaniyan
- Faculty of Medicine, Bioscience and Nursing, MAHSA University, Jalan SP 2, Bandar Saujana Putra, Jenjarom 42610, Selangor, Malaysia;
| | - Yuan Seng Wu
- Centre for Virus and Vaccine Research, School of Medical and Life Sciences, Sunway University, Subang Jaya 47500, Selangor, Malaysia;
- Department of Biological Sciences, School of Medical and Life Sciences, Sunway University, Subang Jaya 47500, Selangor, Malaysia
| | - Abul Kalam Azad
- Faculty of Pharmacy, AIMST University, Bedong 08100, Kedah, Malaysia;
| | - Neeraj Kumar Fuloria
- Faculty of Pharmacy, AIMST University, Bedong 08100, Kedah, Malaysia;
- Center for Transdisciplinary Research, Department of Pharmacology, Saveetha Institute of Medical and Technical Sciences, Saveetha Dental College and Hospital, Saveetha University, Chennai 600077, Tamil Nadu, India;
- Correspondence: (M.S.); (S.F.); (N.K.F.); Tel.: +60-163346653 (M.S.); +60-143034057 (S.F.); +60-164037685 (N.K.F.)
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Krsihna BV, Gangadhar A, Ravi S, Mohan D, Panigrahy AK, Rajeswari VR, Prakash MD. A Highly Sensitive Graphene-based Field Effect Transistor for the Detection of Myoglobin. Silicon 2022; 14:11741-11748. [PMCID: PMC9043500 DOI: 10.1007/s12633-022-01790-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Accepted: 02/24/2022] [Indexed: 08/27/2023]
Abstract
Biomedical applications adapt Nano technology-based transistors as a key component in the biosensors for diagnosing life threatening diseases like Covid-19, Acute myocardial infarction (AMI), etc. The proposed work introduces a new biosensor, based on Graphene Field Effect Transistor (GFET), which is used in the diagnosis of Myoglobin (Mb) in human blood. Graphene-based biosensors are faster, more precise, stronger, and more trustworthy. A GFET is created in this study for the detection of myoglobin biomarker at various low concentrations. Because graphene is sensitive to a variety of biomarker materials, it can be employed as a gate material. When constructed Graphene FET is applied to myoglobin antigens, it has a significant response. The detection level for myoglobin is roughly 30 fg/ml, which is quite high. The electrical behavior of the GFET-based biosensor in detecting myoglobin marker is ideal for Lab-on-Chip platforms and Cardiac Point-of-Care Diagnosis.
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Affiliation(s)
- B. Vamsi Krsihna
- Department of ECE, Koneru Lakshmaih Education Foundation, Guntur, 522502 Andhra Pradesh India
| | - A. Gangadhar
- Department of ECE, University College of Engineering Narasaropet, Narasaropet, 522601 India
| | - S. Ravi
- Department of ECE, Gudlavalleru Engineering College, 521356 Gudlavalleru, Andhra Pradesh India
| | - D. Mohan
- Department of ECE, Sreenidhi Institute of Science and Technology, 501301 Hyderabad, Telangana India
| | - Asisa Kumar Panigrahy
- Department of ECE, Gokaraju Rangaraju Institute of Engineering & Technology, 500090 Hyderabad, Telangana India
| | - V. Raja Rajeswari
- Department of ECE, VR Siddhartha Engineering College, 520007 Vijayawada, Andhra Pradesh India
| | - M. Durga Prakash
- Department of ECE, SRM University-AP, 522240 Mangalagiri, Andhra Pradesh India
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Fuloria S, Yusri MAA, Sekar M, Gan SH, Rani NNIM, Lum PT, Ravi S, Subramaniyan V, Azad AK, Jeyabalan S, Wu YS, Meenakshi DU, Sathasivam KV, Fuloria NK. Genistein: A Potential Natural Lead Molecule for New Drug Design and Development for Treating Memory Impairment. Molecules 2022; 27:265. [PMID: 35011497 PMCID: PMC8746870 DOI: 10.3390/molecules27010265] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 12/20/2021] [Accepted: 12/24/2021] [Indexed: 12/14/2022] Open
Abstract
Genistein is a naturally occurring polyphenolic molecule in the isoflavones group which is well known for its neuroprotection. In this review, we summarize the efficacy of genistein in attenuating the effects of memory impairment (MI) in animals. Scopus, PubMed, and Web of Science databases were used to find the relevant articles and discuss the effects of genistein in the brain, including its pharmacokinetics, bioavailability, behavioral effects, and some of the potential mechanisms of action on memory in several animal models. The results of the preclinical studies highly suggested that genistein is highly effective in enhancing the cognitive performance of the MI animal models, specifically in the memory domain, including spatial, recognition, retention, and reference memories, through its ability to reduce oxidative stress and attenuate neuroinflammation. This review also highlighted challenges and opportunities to improve the drug delivery of genistein for treating MI. Along with that, the possible structural modifications and derivatives of genistein to improve its physicochemical and drug-likeness properties are also discussed. The outcomes of the review proved that genistein can enhance the cognitive performance and ameliorate MI in different preclinical studies, thus indicating its potential as a natural lead for the design and development of a novel neuroprotective drug.
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Affiliation(s)
- Shivkanya Fuloria
- Faculty of Pharmacy, AIMST University, Bedong 08100, Malaysia; (S.F.); (A.K.A.)
| | - Muhamad Azrul Amir Yusri
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Health Sciences, Royal College of Medicine Perak, Universiti Kuala Lumpur, Ipoh 30450, Malaysia; (M.A.A.Y.); (M.S.); (P.T.L.)
| | - Mahendran Sekar
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Health Sciences, Royal College of Medicine Perak, Universiti Kuala Lumpur, Ipoh 30450, Malaysia; (M.A.A.Y.); (M.S.); (P.T.L.)
| | - Siew Hua Gan
- School of Pharmacy, Monash University Malaysia, Bandar Sunway 47500, Malaysia;
| | - Nur Najihah Izzati Mat Rani
- Faculty of Pharmacy and Health Sciences, Royal College of Medicine Perak, Universiti Kuala Lumpur, Ipoh 30450, Malaysia;
| | - Pei Teng Lum
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Health Sciences, Royal College of Medicine Perak, Universiti Kuala Lumpur, Ipoh 30450, Malaysia; (M.A.A.Y.); (M.S.); (P.T.L.)
| | - Subban Ravi
- Department of Chemistry, Karpagam Academy of Higher Education, Coimbatore 641021, India;
| | - Vetriselvan Subramaniyan
- Faculty of Medicine, Bioscience and Nursing, MAHSA University, Jalan SP 2, Bandar Saujana Putra, Jenjarom Selangor, Shah Alam 42610, Malaysia;
| | - Abul Kalam Azad
- Faculty of Pharmacy, AIMST University, Bedong 08100, Malaysia; (S.F.); (A.K.A.)
| | - Srikanth Jeyabalan
- Department of Pharmacology, Sri Ramachandra Faculty of Pharmacy, Sri Ramachandra Institute of Higher Education and Research (DU), Chennai 600116, India;
| | - Yuan Seng Wu
- Centre for Virus and Vaccine Research, School of Medical and Life Sciences, Sunway University, Subang Jaya 47500, Malaysia;
- Department of Biological Sciences, School of Medical and Life Sciences, Sunway University, Subang Jaya 47500, Malaysia
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Watroly MN, Sekar M, Fuloria S, Gan SH, Jeyabalan S, Wu YS, Subramaniyan V, Sathasivam KV, Ravi S, Mat Rani NNI, Lum PT, Vaijanathappa J, Meenakshi DU, Mani S, Fuloria NK. Chemistry, Biosynthesis, Physicochemical and Biological Properties of Rubiadin: A Promising Natural Anthraquinone for New Drug Discovery and Development. Drug Des Devel Ther 2021; 15:4527-4549. [PMID: 34764636 PMCID: PMC8576757 DOI: 10.2147/dddt.s338548] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Accepted: 10/13/2021] [Indexed: 12/11/2022] Open
Abstract
Anthraquinones (AQs) are found in a variety of consumer products, including foods, nutritional supplements, drugs, and traditional medicines, and have a wide range of pharmacological actions. Rubiadin, a 1,3-dihydroxy-2-methyl anthraquinone, primarily originates from Rubia cordifolia Linn (Rubiaceae). It was first discovered in 1981 and has been reported for many biological activities. However, no review has been reported so far to create awareness about this molecule and its role in future drug discovery. Therefore, the present review aimed to provide comprehensive evidence of Rubiadin's phytochemistry, biosynthesis, physicochemical properties, biological properties and therapeutic potential. Relevant literature was gathered from numerous scientific databases including PubMed, ScienceDirect, Scopus and Google Scholar between 1981 and up-to-date. The distribution of Rubiadin in numerous medicinal plants, as well as its method of isolation, synthesis, characterisation, physiochemical properties and possible biosynthesis pathways, was extensively covered in this review. Following a rigorous screening and tabulating, a thorough description of Rubiadin's biological properties was gathered, which were based on scientific evidences. Rubiadin fits all five of Lipinski's rule for drug-likeness properties. Then, the in depth physiochemical characteristics of Rubiadin were investigated. The simple technique for Rubiadin's isolation from R. cordifolia and the procedure of synthesis was described. Rubiadin is also biosynthesized via the polyketide and chorismate/o-succinylbenzoic acid pathways. Rubiadin is a powerful molecule with anticancer, antiosteoporotic, hepatoprotective, neuroprotective, anti-inflammatory, antidiabetic, antioxidant, antibacterial, antimalarial, antifungal, and antiviral properties. The mechanism of action for the majority of the pharmacological actions reported, however, is unknown. In addition to this review, an in silico molecular docking study was performed against proteins with PDB IDs: 3AOX, 6OLX, 6OSP, and 6SDC to support the anticancer properties of Rubiadin. The toxicity profile, pharmacokinetics and possible structural modifications were also described. Rubiadin was also proven to have the highest binding affinity to the targeted proteins in an in silico study; thus, we believe it may be a potential anticancer molecule. In order to present Rubiadin as a novel candidate for future therapeutic development, advanced studies on preclinical, clinical trials, bioavailability, permeability and administration of safe doses are necessary.
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Affiliation(s)
- Mohd Nasarudin Watroly
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Health Sciences, Universiti Kuala Lumpur Royal College of Medicine Perak, Ipoh, Perak, 30450, Malaysia
| | - Mahendran Sekar
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Health Sciences, Universiti Kuala Lumpur Royal College of Medicine Perak, Ipoh, Perak, 30450, Malaysia
| | - Shivkanya Fuloria
- Faculty of Pharmacy & Centre of Excellence for Biomaterials Engineering, AIMST University, Kedah, 08100, Malaysia
| | - Siew Hua Gan
- School of Pharmacy, Monash University Malaysia, Bandar Sunway, Selangor Darul Ehsan, 47500, Malaysia
| | - Srikanth Jeyabalan
- Department of Pharmacology, Sri Ramachandra Faculty of Pharmacy, Sri Ramachandra Institute of Higher Education and Research (DU), Chennai, Tamil Nadu, 600116, India
| | - Yuan Seng Wu
- Centre for Virus and Vaccine Research, School of Medical and Life Sciences, Sunway University, Selangor, 47500, Malaysia
- Department of Biological Sciences, School of Medical and Life Sciences, Sunway University, Selangor, 47500, Malaysia
| | | | - Kathiresan V Sathasivam
- Faculty of Applied Science & Centre of Excellence for Biomaterials Engineering, AIMST University, Kedah, 08100, Malaysia
| | - Subban Ravi
- Department of Chemistry, Karpagam Academy of Higher Education, Coimbatore, Tamil Nadu, 640 021, India
| | - Nur Najihah Izzati Mat Rani
- Faculty of Pharmacy and Health Sciences, Universiti Kuala Lumpur Royal College of Medicine Perak, Ipoh, Perak, 30450, Malaysia
| | - Pei Teng Lum
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Health Sciences, Universiti Kuala Lumpur Royal College of Medicine Perak, Ipoh, Perak, 30450, Malaysia
| | - Jaishree Vaijanathappa
- Department of Pharmaceutical Chemistry, School of Life Sciences, JSS Academy of Higher Education and Research Mauritius, Vacoas, Mauritius
| | | | - Shankar Mani
- Department of Pharmaceutical Chemistry, Sri Adichunchanagiri College of Pharmacy, Adichunchanagiri University, Mandya, Karnataka, 571418, India
| | - Neeraj Kumar Fuloria
- Faculty of Pharmacy & Centre of Excellence for Biomaterials Engineering, AIMST University, Kedah, 08100, Malaysia
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Maddali VR, Nagula P, Ravi S, P KMK. Predictors of coronary slow flow phenomenon in patients with angina and normal epicardial coronaries. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.1082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Coronary slow flow phenomenon (CSFP), also called as syndrome Y is characterized by the delayed passage of contrast distally when injected into the epicardial coronaries. It accounts for upto 7% of patients undergoing coronary angiogram (CAG) for angina. Conventionally, it is determined by the coronary filling time. We aimed to determine whether coronary emptying time is a significant predictor of the coronary slow flow.
Purpose
To determine the coronary artery filling time and emptying time at prespecified vascular landmarks in patients with chest pain and normal epicardial coronaries.
To determine the association of coronary arterial filling time and emptying time in patients with coronary slow flow phenomenon.
To determine the association of various conventional coronary artery disease risk factors and various clinical parameters in patients with coronary slow flow phenomenon.
Methods
Patients with angina, having normal epicardial coronaries on CAG were selected consecutively between January 2019 and December 2020. Each angiogram was assessed for the coronary filling and emptying times at prespecified standard vascular landmarks on the basis of TIMI frame counts (TFC).
Results
A total of 37 patients with normal epicardial coronaries were analyzed, out of which 27 patients had slow flow in LAD and 17 patients had slow flow in RCA (10 had normal flow in LAD and 12 had normal flow in RCA). Eight had non dominant RCA, which were too small for analyzing TFC were excluded from the study. We observed positive correlation of coronary filling times and emptying times, both in LAD (R-Sq 0.24) and RCA (R-Sq 0.05) in slow flow patients unlike those with normal flow. We found the filling times and emptying times are significantly prolonged in slow flow patients [with mean CTFC values of 77.94 & 92.85 in LAD and 36.91 & 120.82 in RCA, respectively (P<0.05)]. The capillary and venous transit time is prolonged both in LAD and RCA slow flow groups, which was of statistical significance in the RCA slow flow group (P<0.05), but not in LAD slow flow group (P=0.43). We observed slow flow significantly more in male population (P=0.02) and associated with high LDL/HDL ratios and high triglycerides.
Conclusion
1. In addition to coronary artery filling times, Coronary artery emptying time is an independent and significant predictor of coronary slow flow phenomenon.
2. Capillary and venous transit time is significantly prolonged in patients with slow flow in RCA whereas in patients with LAD slow flow there is non significant prolongation of capillary and venous transit time.
3. There is a positive correlation of coronary emptying time with coronary filling time in Coronary Slow Flow. This correlation is not seen in patients with normal coronary flow.
4. Coronary slow flow is observed significantly more in male population.
5. Coronary slow flow is significantly associated with high LDL/HDL ratios and triglyceride levels.
Funding Acknowledgement
Type of funding sources: None. Study designAngiographic landmarks for LAD and RCA – Pictorial representation
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Affiliation(s)
- V R Maddali
- Osmania General Hospital, Cardiology, Hyderabad, India
| | - P Nagula
- Osmania General Hospital, Cardiology, Hyderabad, India
| | - S Ravi
- Osmania General Hospital, Cardiology, Hyderabad, India
| | - K M K P
- Osmania General Hospital, Cardiology, Hyderabad, India
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David CI, Prabakaran G, Sundaram K, Ravi S, Devi DP, Abiram A, Nandhakumar R. Rhodanine-based fluorometric sequential monitoring of silver (I) and iodide ions: Experiment, DFT calculation and multifarious applications. J Hazard Mater 2021; 419:126449. [PMID: 34323715 DOI: 10.1016/j.jhazmat.2021.126449] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Revised: 06/03/2021] [Accepted: 06/19/2021] [Indexed: 06/13/2023]
Abstract
A simple rhodanine derived fluorophoric unit has been designed for selective detection of Ag+ and I- ions in DMSO-H2O medium. The sensor R1 showed an obvious "turn-on" fluorescence response toward Ag+ due to the inhibition of both C-N single bond free rotation, internal charge transfer (ICT) and the formation of chelation enhanced fluorescence (CHEF) effects. The fluorescence quantum yield (Φ) was increased from 0.0013 to 0.032 for receptor R1 upon the Ag+-complexation. In addition, the 1:1 complexing stoichiometry was employed based on Job's plot analysis with detection limit of 24.23 × 10-7 M. Conversely, receptor R1+Ag+ particularly detects I- ion over other co-existing anions by the "turn-off" fluorescence response due to the formation of AgI, displacing the receptor R1 with the quantum yield of 0.0014. The detection limit was calculated to be 22.83 × 10-7 M. The sensing behaviour of receptor R1 toward Ag+ was also supported by density functional theory (DFT) calculations. Moreover, the sensing ability of reported receptor R1 could be exercised in multifarious applications like paper strip, silica-supported analysis, staining test for latent finger print, logical behaviour, smartphone-assisted quantitative detection and real water samples studies.
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Affiliation(s)
- Charles Immanuel David
- Department of Applied Chemistry, Karunya Institute of Technology and Sciences, (Deemed-to-be University), Karunya Nagar, Coimbatore 641 114, India
| | - Gunasekaran Prabakaran
- Department of Applied Chemistry, Karunya Institute of Technology and Sciences, (Deemed-to-be University), Karunya Nagar, Coimbatore 641 114, India
| | - Kaveri Sundaram
- Department of Chemistry, Karpagam Academy of Higher Education, Eachanari, Coimbatore 641 021, India
| | - Subban Ravi
- Department of Chemistry, Karpagam Academy of Higher Education, Eachanari, Coimbatore 641 021, India.
| | - Duraisamy Parimala Devi
- Department of Applied Physics, Karunya Institute of Technology and Sciences, (Deemed-to-be University), Karunya Nagar, Coimbatore 641 114, India
| | - Angamuthu Abiram
- Department of Applied Physics, Karunya Institute of Technology and Sciences, (Deemed-to-be University), Karunya Nagar, Coimbatore 641 114, India.
| | - Raju Nandhakumar
- Department of Applied Chemistry, Karunya Institute of Technology and Sciences, (Deemed-to-be University), Karunya Nagar, Coimbatore 641 114, India.
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Raza A, Ravi S, Tajudeen S, Sheriff A. Sulfonated covalent triazine polymer loaded with Pd nanoparticles as a bifunctional catalyst for one pot hydrogenation esterification reaction. J SOLID STATE CHEM 2021. [DOI: 10.1016/j.jssc.2021.122417] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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13
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Muhamad Fadzil NS, Sekar M, Gan SH, Bonam SR, Wu YS, Vaijanathappa J, Ravi S, Lum PT, Dhadde SB. Chemistry, Pharmacology and Therapeutic Potential of Swertiamarin - A Promising Natural Lead for New Drug Discovery and Development. Drug Des Devel Ther 2021; 15:2721-2746. [PMID: 34188450 PMCID: PMC8233004 DOI: 10.2147/dddt.s299753] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Accepted: 02/04/2021] [Indexed: 01/07/2023]
Abstract
Swertiamarin, a seco-iridoid glycoside, is mainly found in Enicostemma littorale Blume (E. littorale) and exhibits therapeutic activities for various diseases. The present study aimed to provide a review of swertiamarin in terms of its phytochemistry, physicochemical properties, biosynthesis, pharmacology and therapeutic potential. Relevant literature was collected from several scientific databases, including PubMed, ScienceDirect, Scopus and Google Scholar, between 1990 and the present. This review included the distribution of swertiamarin in medicinal plants and its isolation, characterization, physicochemical properties and possible biosynthetic pathways. A comprehensive summary of the pharmacological activities, therapeutic potential and metabolic pathways of swertiamarin was also included after careful screening and tabulation. Based on the reported evidence, swertiamarin meets all five of Lipinski’s rules for drug-like properties. Thereafter, the physicochemical properties of swertiamarin were detailed and analyzed. A simple and rapid method for isolating swertiamarin from E. littorale has been described. The present review proposed that swertiamarin may be biosynthesized by the mevalonate or nonmevalonate pathways, followed by the seco-iridoid pathway. It has also been found that swertiamarin is a potent compound with diverse pharmacological activities, including hepatoprotective, analgesic, anti-inflammatory, antiarthritis, antidiabetic, antioxidant, neuroprotective and gastroprotective activities. The anticancer activity of swertiamarin against different cancer cell lines has been recently reported. The underlying mechanisms of all these pharmacological effects are diverse and seem to involve the regulation of different molecular targets, including growth factors, inflammatory cytokines, protein kinases, apoptosis-related proteins, receptors and enzymes. Swertiamarin also modulates the activity of several transcription factors, and their signaling pathways in various pathological conditions are also discussed. Moreover, we have highlighted the toxicity profile, pharmacokinetics and possible structural modifications of swertiamarin. The pharmacological activities and therapeutic potential of swertiamarin have been extensively investigated. However, more advanced studies are required including clinical trials and studies on the bioavailability, permeability and administration of safe doses to offer swertiamarin as a novel candidate for future drug development.
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Affiliation(s)
- Nur Sakinah Muhamad Fadzil
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Health Sciences, Universiti Kuala Lumpur Royal College of Medicine Perak, Ipoh, Perak, Malaysia
| | - Mahendran Sekar
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Health Sciences, Universiti Kuala Lumpur Royal College of Medicine Perak, Ipoh, Perak, Malaysia
| | - Siew Hua Gan
- School of Pharmacy, Monash University Malaysia, Bandar Sunway, Selangor, Malaysia
| | - Srinivasa Reddy Bonam
- Institut National de la Santé et de la Recherche Médicale, Centre de Recherche des Cordeliers, Equipe-Immunopathologie et Immunointervention Thérapeutique, Sorbonne Université, Université de Paris, Paris, France
| | - Yuan Seng Wu
- Department of Biochemistry, School of Medicine, Faculty of Medicine, Bioscience and Nursing, MAHSA University, Bandar Saujana Putra, Selangor, Malaysia
| | - Jaishree Vaijanathappa
- Department of Pharmaceutical Chemistry, JSS College of Pharmacy, Mysuru, Karnataka, India
| | - Subban Ravi
- Department of Chemistry, Karpagam Academy of Higher Education, Coimbatore, Tamil Nadu, India
| | - Pei Teng Lum
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Health Sciences, Universiti Kuala Lumpur Royal College of Medicine Perak, Ipoh, Perak, Malaysia
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Das M, Mamnoon F, Mansoor H, Meneguim AC, Singh P, Shah I, Ravi S, Kalon S, Hossain FN, Ferlazzo G, Isaakidis P, Furin J, Acharya S, Thakur HP. New TB drugs for the treatment of children and adolescents with rifampicin-resistant TB in Mumbai, India. Int J Tuberc Lung Dis 2021; 24:1265-1271. [PMID: 33317670 DOI: 10.5588/ijtld.20.0165] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
SETTING: Médecins Sans Frontières (MSF) clinic in Mumbai, India.OBJECTIVE: To determine the final treatment outcomes, culture conversion and adverse events (AEs) during treatment among children and adolescents (0-19 years) with rifampicin-resistant tuberculosis (RR-TB) who received ambulatory injectable-free treatment, including bedaquiline (BDQ) and/or delamanid (DLM) during September 2014-January 2020.DESIGN: This was a retrospective cohort study based on review of routinely collected programme data.RESULTS: Twenty-four patients were included; the median age was 15.5 years (min-max 3-19) and 15 (63%) were females. None were HIV-coinfected. All had fluoroquinolone resistance. Twelve received treatment, including BDQ and DLM, 11 received DLM and one BDQ. The median exposure to BDQ (n = 13) and DLM (n = 23) was 82 (IQR 80-93) and 82 (IQR 77-96) weeks, respectively. Seventeen (94%) patients with positive culture at baseline (n = 18) had negative culture during treatment; median time for culture-conversion was 7 weeks (IQR 5-11). Twenty-three (96%) had successful treatment outcomes: cured (n = 16) or completed treatment (n = 7); one died. Eleven (46%) had 17 episodes of AEs. Two of 12 serious AEs were associated with new drugs (QTcF >500 ms).CONCLUSION: Based on one of the largest global cohorts of children and adolescents to receive new TB drugs, this study has shown that injectable-free regimens containing BDQ and/or DLM on ambulatory basis were effective and well-tolerated among children and adolescents and should be made routinely accessible to these vulnerable groups.
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Affiliation(s)
- M Das
- Médecins Sans Frontières, Mumbai, Tata Institute of Social Sciences, Mumbai
| | | | | | | | - P Singh
- Médecins Sans Frontières, Mumbai
| | - I Shah
- Bai Jerbai Wadia Hospital for Children, Mumbai, India
| | - S Ravi
- Médecins Sans Frontières, Mumbai
| | - S Kalon
- Médecins Sans Frontières, Mumbai
| | | | - G Ferlazzo
- Southern Africa Medical Unit, Médecins Sans Frontières, Cape Town, South Africa
| | - P Isaakidis
- Southern Africa Medical Unit, Médecins Sans Frontières, Cape Town, South Africa
| | - J Furin
- Department of Global Health and Social Medicine, Harvard Medical School, Boston, MA, USA
| | - S Acharya
- Mumbai Districts AIDS Control Society, Mumbai
| | - H P Thakur
- Tata Institute of Social Sciences, Mumbai, National Institute of Health and Family Welfare, New Delhi, India
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15
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Puttagunta M, Ravi S. Medical image analysis based on deep learning approach. Multimed Tools Appl 2021; 80:24365-24398. [PMID: 33841033 PMCID: PMC8023554 DOI: 10.1007/s11042-021-10707-4] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 11/28/2020] [Accepted: 02/10/2021] [Indexed: 05/05/2023]
Abstract
Medical imaging plays a significant role in different clinical applications such as medical procedures used for early detection, monitoring, diagnosis, and treatment evaluation of various medical conditions. Basicsof the principles and implementations of artificial neural networks and deep learning are essential for understanding medical image analysis in computer vision. Deep Learning Approach (DLA) in medical image analysis emerges as a fast-growing research field. DLA has been widely used in medical imaging to detect the presence or absence of the disease. This paper presents the development of artificial neural networks, comprehensive analysis of DLA, which delivers promising medical imaging applications. Most of the DLA implementations concentrate on the X-ray images, computerized tomography, mammography images, and digital histopathology images. It provides a systematic review of the articles for classification, detection, and segmentation of medical images based on DLA. This review guides the researchers to think of appropriate changes in medical image analysis based on DLA.
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Affiliation(s)
- Muralikrishna Puttagunta
- Department of Computer Science, School of Engineering and Technology, Pondicherry University, Pondicherry, India
| | - S. Ravi
- Department of Computer Science, School of Engineering and Technology, Pondicherry University, Pondicherry, India
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16
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Natchimuthu V, Ravi S, Amoros J. Improved Performance of Carbamazepine and Benzodiazepine by Oxygen Enrichment through Perfluorodecalin for Lennox-Gastaut Type of Seizures. Indian J Pharm Sci 2021. [DOI: 10.36468/pharmaceutical-sciences.836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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17
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Kumar R, Ravi S, Immanuel David C, Nandhakumar R. A photo-induced electron transfer based reversible fluorescent chemosensor for specific detection of mercury (II) ions and its applications in logic gate, keypad lock and real samples. ARAB J CHEM 2021. [DOI: 10.1016/j.arabjc.2020.11.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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18
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Sell T, Warmbrod L, Trotochaud M, Ravi S, Martin E, Watson C. Using prediction polling for infectious disease forecasting. Int J Infect Dis 2020. [DOI: 10.1016/j.ijid.2020.09.984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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19
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Meneguim AC, Rebello L, Das M, Ravi S, Mathur T, Mankar S, Kharate S, Tipre P, Oswal V, Iyer A, Mansoor H, Kalon S, Garone D, Ferlazzo G, Isaakidis P. Adapting TB services during the COVID-19 pandemic in Mumbai, India. Int J Tuberc Lung Dis 2020; 24:1119-1121. [PMID: 33126951 DOI: 10.5588/ijtld.20.0537] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
| | | | - M Das
- Médecins Sans Frontières, Mumbai
| | - S Ravi
- Médecins Sans Frontières, Mumbai
| | - T Mathur
- Médecins Sans Frontières, Mumbai
| | - S Mankar
- National Tuberculosis Elimination Programme, Mumbai, India
| | - S Kharate
- National Tuberculosis Elimination Programme, Mumbai, India
| | - P Tipre
- National Tuberculosis Elimination Programme, Mumbai, India
| | - V Oswal
- National Tuberculosis Elimination Programme, Mumbai, India
| | - A Iyer
- Médecins Sans Frontières, Mumbai
| | | | - S Kalon
- Médecins Sans Frontières, Mumbai
| | - D Garone
- Médecins Sans Frontières, Brussels, Belgium
| | - G Ferlazzo
- Southern Africa Medical Unit, Médecins Sans Frontières, Cape Town, South Africa, ,
| | - P Isaakidis
- Southern Africa Medical Unit, Médecins Sans Frontières, Cape Town, South Africa, ,
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20
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Krsihna BV, Ravi S, Prakash MD. Recent developments in graphene based field effect transistors. Mater Today Proc 2020; 45:S2214-7853(20)35804-1. [PMID: 32983908 PMCID: PMC7505095 DOI: 10.1016/j.matpr.2020.07.678] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/18/2020] [Revised: 07/27/2020] [Accepted: 07/29/2020] [Indexed: 12/25/2022]
Abstract
This paper presents a comprehensive survey on the recent developments in Graphene Field Effect Transistor (G-FET), considering various aspects such as fabrication, modelling and simulation tools and applications especially in sensors, highlighting the future directions. Complying with the Moore's law, to increase the transistor density of an Integrated Circuit, new alternate materials for fabrication have been tried, instead of silicon due to its limitations in reducing transistor dimensions. Graphene, one such material, proves to be a suitable alternate for silicon due to the factors like superior carrier mobility and very high trans-conductance gain, etc and G-FET is becoming the most suitable choice for high-speed analog VLSI, RF, and bio- sensor circuits.
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Affiliation(s)
- B Vamsi Krsihna
- Department of Electronics and Communication Engineering, Koneru Lakshmaiah Education Foundation, Guntur 522502, Andhra Pradesh, India
| | - S Ravi
- Department of Electronics and Communication Engineering, Gudlavalleru Engineering College, Gudlavalleru 521356, Andhra Pradesh, India
| | - M Durga Prakash
- Department of Electronics and Communication Engineering, Koneru Lakshmaiah Education Foundation, Guntur 522502, Andhra Pradesh, India
- Department of Electronics and Communication Engineering, Velagapudi Ramakrishna Siddhartha Engineering College, Vijayawada 520 007, Andhra Pradesh, India
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21
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Stewart JD, Shakya KM, Bilinski T, Wilson JW, Ravi S, Choi CS. Variation of near surface atmosphere microbial communities at an urban and a suburban site in Philadelphia, PA, USA. Sci Total Environ 2020; 724:138353. [PMID: 32408469 DOI: 10.1016/j.scitotenv.2020.138353] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Revised: 03/28/2020] [Accepted: 03/30/2020] [Indexed: 06/11/2023]
Abstract
Microorganisms are abundant in the near surface atmosphere and make up a significant fraction of organic aerosols with implications on both human health and ecosystem services. Despite their importance, studies investigating biogeographical patterns of the atmospheric microbiome between urban and suburban areas are limited. Urban and suburban locations (including their microbial communities) vary considerably depending on climate, topography, industrial activities, demographics and other socio-economic factors. Hence, we need more location-specific data to make informed decision affecting air quality, human health, and the implication of a changing climate and policy decisions. The objective of this study was to describe how the atmospheric microbiome varies in composition and function between urban and suburban sites. We used high-throughput sequencing to analyze microbial communities collected at different times from PM2.5 samples collected by active sampling method (using a pump and an impactor) and dust settling of TSP collected by passive sampling method (no pump and no impactor) from an urban and suburban site. We found diverse communities unique in composition at both sites with equivalent functional potential. Taxonomic composition varied significantly with Proteobacteria, Firmicutes, Actinobacteria, Bacteroidetes, and Other phyla in greater relative abundance at the urban site. In contrast, Cyanobacteria, Tenericutes, Fusobacteria, and Deinococcus, were enriched at the suburban site. Community diversity also demonstrated a high degree of temporal variation within site. We identified over one-third of the communities as potentially pathogenic taxa (urban: 47.52% ± 14.40%, suburban: 34.53% ± 14.60%) and determined the majority of organisms come from animal-associated host or are environmental non-specific. Potentially pathogenic taxa and source environments were similar between active- and passive- sampling method results. Our research is novel it adds to the underrepresented set of studies on atmospheric microbial structure and function across land types and is the first to compare suburban and urban atmospheric communities.
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Affiliation(s)
- J D Stewart
- Department of Geography & the Environment, Villanova University, PA, USA
| | - K M Shakya
- Department of Geography & the Environment, Villanova University, PA, USA.
| | - T Bilinski
- Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO, USA
| | - J W Wilson
- Department of Biology, Villanova University, PA, USA
| | - S Ravi
- Department of Earth & Environmental Science, Temple University, PA, USA
| | - Chong Seok Choi
- Department of Earth & Environmental Science, Temple University, PA, USA
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22
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Natchimuthu V, Sharmila N, Ravi S. Crystal structure and Hirshfeld surface analysis of 1-methyl-4-(2-methyl-10 H-benzo[ b]thieno[2,3- e][1,4]diazepin-4-yl)piperazin-1-ium 2,5-di-hydroxy-benzoate propan-2-ol monosolvate. Acta Crystallogr E Crystallogr Commun 2020; 76:1168-1172. [PMID: 32695474 PMCID: PMC7336797 DOI: 10.1107/s205698902000818x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 06/19/2020] [Indexed: 11/21/2022]
Abstract
The asymmetric unit of the title salt, C17H21N4S+·C7H5O4 -·C3H7OH, consists of an olanzapinium cation, an independent 2,5-di-hydroxy-benzoate anion and a solvent isopropyl alcohol mol-ecule. The central seven-membered heterocycle is in a boat conformation, while the piperazine ring displays a distorted chair conformation. The dihedral angle between the benzene and thiene rings flanking the diazepine ring is 52.58 (19)°. In the crystal, the anions and cations are connected by N-H⋯O and O-H⋯O hydrogen bonds, forming a three-dimensional network.
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Affiliation(s)
- V. Natchimuthu
- Department of Physics, M.Kumarasamy College of Engineering, Karur 639113, Tamil Nadu, India
| | - N. Sharmila
- Department of Physics, Shrimati Indira Gandhi College, Tiruchirappalli 620 002, Tamilnadu, India
| | - S. Ravi
- Postgraduate and Research Department of Physics, National College (Autonomous), Tiruchirappalli 620 001, Tamilnadu, India
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23
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Celestina SK, Sundaram K, Ravi S. In vitro studies of potent aldose reductase inhibitors: Synthesis, characterization, biological evaluation and docking analysis of rhodanine-3-hippuric acid derivatives. Bioorg Chem 2020; 97:103640. [PMID: 32086051 DOI: 10.1016/j.bioorg.2020.103640] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2019] [Revised: 11/28/2019] [Accepted: 01/28/2020] [Indexed: 01/31/2023]
Abstract
Inhibitors of aldose reductase are rate-limiting enzymes and could play a key role to prevent the complications of diabetes. In our attempt to develop novel inhibitors of aldose reductase, the derivatives of rhodanine-3-hippuric acid-pyrazole hybrid were synthesized and characterised by spectral data. The biological studies reveal that all the compounds show an excellent activity against ALR2 with IC50 values ranging from 0.04 to 1.36 µM. Among these the synthesised compounds 6a-m, 6g and 6e showed specific inhibitory activity with IC50 values of 0.04 and 0.06 µM respectively against ALR2 and found to be more potent than epalrestat (IC50 = 0.87 μM), the only aldose reductase inhibitor currently used in the therapy. Molecular docking analysis using the AR-NADP+ complex as a receptor was performed with all the synthesized compounds. All the compounds exhibit a well-defined binding mode within the AR active site, similarly to previous described AR inhibitors, with the anion head group bound to the catalytic center, blocking thus its activity. By forming hydrogen bonds with Tyr48 and His110 of the protein from ALR2 (PDB ID: 2FZD), the compounds 6g and 6e interrupt the proton donation mechanism, which is necessary for the catalytic activity of ALR2.
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Affiliation(s)
- Stephen Kumar Celestina
- Department of Chemistry, Karpagam Academy of Higher Education, Coimbatore 641021, Tamil Nadu, India
| | - Kaveri Sundaram
- Department of Chemistry, Karpagam Academy of Higher Education, Coimbatore 641021, Tamil Nadu, India.
| | - Subban Ravi
- Department of Chemistry, Karpagam Academy of Higher Education, Coimbatore 641021, Tamil Nadu, India
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24
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Kumar IG, Pradeep S, Ravi S, Kiran HJ, Raghunath N. Stem cells in orthodontics and dentofacial orthopedics: Current trends and future perspectives. Int J Orthod Rehabil 2020. [DOI: 10.4103/ijor.ijor_45_19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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25
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Kumar IG, Raghunath N, Jyothikiran H, Ravi S, Pradeep S. Influence of chronic congenital systemic disorder effects in orthodontic treatment. Int J Orthod Rehabil 2020. [DOI: 10.4103/ijor.ijor_22_20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Maurya P, Sadanandan A, Aal M, Ravi S, Bapsy P. Sahai: A restorative support to address unmet needs of women with cancer – impact on quality of life. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz434.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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27
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Stephen Kumar Celestina, Sundaram K, Ravi S. Novel Derivatives of Rhodanine-3-Hippuric Acid as Active Inhibitors of Aldose Reductase: Synthesis, Biological Evaluation, and Molecular Docking Analysis. Russ J Bioorg Chem 2019. [DOI: 10.1134/s1068162019050066] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Bhattacharya S, Kumar H, Guha A, Dagar AK, Pathak S, (Pasricha) KR, Mondal S, Vinod Kumar K, Farrand W, Chatterjee S, Ravi S, Sharma AK, Rajawat AS. Potential of Airborne Hyperspectral Data for Geo-Exploration over Parts of Different Geological/Metallogenic Provinces in India based on AVIRIS-NG Observations. CURR SCI INDIA 2019. [DOI: 10.18520/cs/v116/i7/1143-1156] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Elumalai K, Velmurugan S, Ravi S, Kathiravan V, Ashokkumar S. Retraction notice to "Facile, Eco-friendly and template free phytosynthesis of Cauliflower like ZnO nanoparticles using leaf extract of Tamarindus indica (L.) and its biological evolution of antibacterial and antifungal activities" [Spectrochim. Acta A Mol. Biomol. Spectrosc. 136 (Part B) (2015) 1052-1057]. Spectrochim Acta A Mol Biomol Spectrosc 2019; 207:363. [PMID: 30342768 DOI: 10.1016/j.saa.2018.09.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Affiliation(s)
- K Elumalai
- Department of Physics, Annamalai University, Annamalai Nagar 608 002, India
| | - S Velmurugan
- Department of Engineering Physics (FEAT), Annamalai University, Annamalai Nagar 608 002, India.
| | - S Ravi
- Department of Engineering Physics (FEAT), Annamalai University, Annamalai Nagar 608 002, India
| | - V Kathiravan
- Department of Physics, Annamalai University, Annamalai Nagar 608 002, India
| | - S Ashokkumar
- Department of Physics, Annamalai University, Annamalai Nagar 608 002, India
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Elumalai K, Velmurugan S, Ravi S, Kathiravan V, Ashokkumar S. Retraction notice to "Green synthesis of Zinc oxide nanoparticles using Moringa oleifera leaf extract and evaluation of its antimicrobial activity" [Spectrochim. Acta A Mol. Biomol. Spectrosc. 143 (2015) 158-164]. Spectrochim Acta A Mol Biomol Spectrosc 2019; 206:651. [PMID: 30266450 DOI: 10.1016/j.saa.2018.09.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Affiliation(s)
- K Elumalai
- Department of Physics, Annamalai University, Annamalai Nagar, 608002, India
| | - S Velmurugan
- Department of Engineering Physics (FEAT), Annamalai University, Annamalai Nagar, 608 002, India.
| | - S Ravi
- Department of Engineering Physics (FEAT), Annamalai University, Annamalai Nagar, 608 002, India
| | - V Kathiravan
- Department of Physics, Annamalai University, Annamalai Nagar, 608002, India
| | - S Ashokkumar
- Department of Physics, Annamalai University, Annamalai Nagar, 608002, India
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Gayam V, Ravi S, .N.A.R. Ravikumar G, Thangamani A. SYNTHESIS, ANTICANCER ACTIVITY AND MOLECULAR DOCKING STUDIES OF SOME NOVEL QUINOLINE HYDRAZIDE DERIVATIVES OF SUBSTITUTED BENZALDEHYDES. ACTA ACUST UNITED AC 2019. [DOI: 10.31788/rjc.2019.1225137] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Hariprasad T, Varatharajan K, Ravi S. Investigation of Microstructural and Mechanical Properties of Al 5083-ZrSiO 4-Gr Hybrid Composite. Int J Nanosci 2018. [DOI: 10.1142/s0219581x17600298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
In this present work, an attempt is made to compare the microstructural, mechanical and tribological properties of Al 5083-5% and 10% Gr, Al 5083-5% and 10% ZrSiO4 composite with Al 5083-5, 10% Gr-5 and 10% ZrSiO4 hybrid composite. The samples were prepared by using the stir casting technique, and the characterizations of composites and hybrid composite were observed by using SEM, EDAX and X-ray diffraction (XRD). The mechanical properties such as hardness, tensile, compressive strength of hybrid composite were found to be better than those of composites. The wear test was carried out by using a pin-on-disc wear tribometer by varying parameters like normal load (5, 10[Formula: see text]N), sliding speed (1, 1.5, 2[Formula: see text]m/s) with constant sliding distance (2000[Formula: see text]m). The worn surface of the samples is examined by using SEM, and the wear properties of the hybrid composite are found to exhibit superior wear resistance properties than composites.
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Affiliation(s)
- T. Hariprasad
- Department of Mechanical Engineering, Adhiyamaan College of Engineering, Hosur 635109, India
| | - K. Varatharajan
- Department of Mechanical Engineering, Velammal Engineering College, Chennai 600066, India
| | - S. Ravi
- Department of Mechanical Engineering, Sriram Engineering College, Tiruvallur 602024, India
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Kumari JV, Vasudeva R, Ravi S. On the asymptotic behavior of maxima and near-maxima of random observations from three parameter lognormal distribution. COMMUN STAT-THEOR M 2017. [DOI: 10.1080/03610926.2016.1189572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- J. Vasantha Kumari
- Department of Studies in Statistics, University of Mysore, Manasagangotri, Mysuru, Karnataka, India
| | - R. Vasudeva
- Department of Studies in Statistics, University of Mysore, Manasagangotri, Mysuru, Karnataka, India
| | - S. Ravi
- Department of Studies in Statistics, University of Mysore, Manasagangotri, Mysuru, Karnataka, India
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Sripathi R, Jayagopal D, Ravi S. A study on the seasonal variation of the essential oil composition from Plectranthus hadiensis and its antibacterial activity. Nat Prod Res 2017; 32:871-874. [DOI: 10.1080/14786419.2017.1363748] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Raju Sripathi
- Department of Chemistry, Karpagam University, Karpagam Academy of Higher Education, Coimbatore, India
| | - Dharani Jayagopal
- Department of Chemistry, Karpagam University, Karpagam Academy of Higher Education, Coimbatore, India
| | - Subban Ravi
- Department of Chemistry, Karpagam University, Karpagam Academy of Higher Education, Coimbatore, India
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Natchimuthu V, Thomas S, Ramalingam M, Ravi S. Influence of perfluorocarbons on Carbamazepine and Benzodiazepine for a neuro-lung protective strategy. J Clin Neurosci 2017; 43:82-88. [PMID: 28528895 DOI: 10.1016/j.jocn.2017.04.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 04/22/2017] [Indexed: 11/29/2022]
Abstract
Lennox-Gastaut syndrome (LGS) is commonly characterized by a triad of features including multiple seizure types, intellectual disability or regression. LGS type of seizures is epilepsy which is due to abnormal vibrations occurring in seizures. During the time of such abnormal vibrations, both the seizures and the lungs suffer a lack in oxygen content to a considerable extent. This results in prolonged vibrations and loses of nervous control. As a neuro-lung protective strategy, a novel attempt has been made to enrich both seizures and lungs with oxygen content through the support of Perfluorodecalin (an excellent oxygen carrier) C10F18 (PFD) and Perfluorohexane C6F14 (PFH) along with an enhancement in the antiepileptic activity by the two chosen antiepileptic drugs (AEDs) Carbamazepine (CBZ) and Benzodiazepine (BDZ). Perfluorodecalin C10F18 (PFD) and Perfluorohexane C6F14 (PFH) emulsions were prepared by sonication process with combination of nonionic emulsifier, Lecithin (l-α-phosphatidylcholine) as a surfactant in Aqueous phase medium. These emulsions were mixed with Carbamazepine (CBZ) and Benzodiazepine (BDZ) drugs maintained at a temperature of about -20°C to 20°C and were set to slow evaporation process. The products are subjected to Optical microscope, Transmission electron microscopy (TEM) and Scanning Electron Microscope (SEM) - Energy dispersive X-ray Spectroscopy (EDS). Study reveals the co-existence of fluorine and drug ensuring the oxygen uptake by the drug. Morphology of TEM, Optical microscopic images and the particle diameter estimated through Image_J confirms this analysis.
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Affiliation(s)
- V Natchimuthu
- PG & Research Department of Physics, National College (Affiliated to Bharathidasan University), Tiruchirappalli, Tamilnadu 620 001, India.
| | - Sabu Thomas
- International and Interuniversity Centre for Nanoscience and Nanotechnology, School of Chemical Sciences, Mahatma Gandhi University, Kottayam, Kerala 686 560, India.
| | - Murugan Ramalingam
- Associé des Universités, Faculty of Medicine, University of Strasbourg, 67085 Strasbourg Cedex, France.
| | - S Ravi
- PG & Research Department of Physics, National College (Affiliated to Bharathidasan University), Tiruchirappalli, Tamilnadu 620 001, India.
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Muhammad SA, Ravi S, Thangamani A, Chandrasekaran B, Ramesh M. Synthesis, antiproliferative activity and docking study of novel rhodanine derivatives as Bcr-Abl T1351 inhibitors. Res Chem Intermed 2017. [DOI: 10.1007/s11164-017-2968-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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38
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Punitha S, Ravi S, Anousouya Devi M, Vaishnavi J. Particle swarm optimized computer aided diagnosis system for classification of breast masses. IFS 2017. [DOI: 10.3233/jifs-169224] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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39
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Ashokkumar S, Ravi S, Velmurugan S. Retraction notice to Green Synthesis of Silver nanoparticles from Gloriosa superba.L Leaf extract and their catalytic activity [SAA 115C 388-392]. Spectrochim Acta A Mol Biomol Spectrosc 2017; 173:969. [PMID: 27939415 DOI: 10.1016/j.saa.2016.11.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Affiliation(s)
- S Ashokkumar
- Department of Physics, Annamalai University, Annamalainagar, 608 002, Tamil Nadu, India
| | - S Ravi
- Department of Engg. Physics, Annamalai University, Annamalainagar, 608 002, Tamil Nadu, India
| | - S Velmurugan
- Department of Engg. Physics, Annamalai University, Annamalainagar, 608 002, Tamil Nadu, India
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40
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Padam R, Pandya S, Ravi S, Ramakrishnan S, Nigam AK, Grover AK, Pal D. Study of the sign change of exchange bias across the spin reorientation transition in Co(Cr 1-x Fe x ) 2O 4 (x = 0.00-0.125). J Phys Condens Matter 2017; 29:055803. [PMID: 27911880 DOI: 10.1088/1361-648x/29/5/055803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We present the evolution of novel phenomena of magnetic compensation effect, exchange bias (EB) effect and the field induced anomalies in '[Formula: see text]' substituted multiferroic compound [Formula: see text]. A few percent of '[Formula: see text]' substitution for '[Formula: see text]' in [Formula: see text] results in the reversal of field cooled magnetization under low applied fields below compensation temperature T comp. Further, increase in the field leads to the spin reorientation transition (T SR). Signature of EB in a narrow temperature window in the vicinity of T SR and its sign change across T SR is observed. Magnitude of EB depends on the amount of compensation and rigidity of the spin reorientation. We also notice the appearance of positive EB below the lock-in transition (T L). Presence of unidirectional anisotropy developed in the commensurate spin-spiral below T L could be responsible for the appearance of EB below T L.
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Affiliation(s)
- R Padam
- Department of Physics, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
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Ashokkumar S, Ravi S, Kathiravan V, Velmurugan S. Retraction notice to "Synthesis of silver nanoparticles using A. indicum leaf extract and their antibacterial activity" [SAA (2014) 134C 34-39]. Spectrochim Acta A Mol Biomol Spectrosc 2017; 171:526. [PMID: 27692292 DOI: 10.1016/j.saa.2016.08.060] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Affiliation(s)
- S Ashokkumar
- Department of Physics, Annamalai University, Annamalainagar, 608 002, Tamil Nadu, India
| | - S Ravi
- Department of Engg. Physics, Annamalai University, Annamalainagar, 608 002, Tamil Nadu, India
| | - V Kathiravan
- Department of Physics, Annamalai University, Annamalainagar, 608 002, Tamil Nadu, India
| | - S Velmurugan
- Department of Engg. Physics, Annamalai University, Annamalainagar, 608 002, Tamil Nadu, India
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42
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Ashokkumar S, Ravi S, Kathiravan V, Velmurugan S. Retraction notice to "Synthesis, characterization and catalytic activity of Silver Nanoparticles Using Tribulus terrestris Leaf Extract" [SAA (2014) 88-93]. Spectrochim Acta A Mol Biomol Spectrosc 2017; 171:527. [PMID: 27692293 DOI: 10.1016/j.saa.2016.08.059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Affiliation(s)
- S Ashokkumar
- Department of Physics, Annamalai University, Annamalainagar, 608 002, Tamil Nadu, India
| | - S Ravi
- Department of Engg. Physics, Annamalai University, Annamalainagar, 608 002, Tamil Nadu, India
| | - V Kathiravan
- Department of Physics, Annamalai University, Annamalainagar, 608 002, Tamil Nadu, India
| | - S Velmurugan
- Department of Engg. Physics, Annamalai University, Annamalainagar, 608 002, Tamil Nadu, India
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43
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Ravi S. CUSTOMISED SPORT INJURY REHABILITATION WITH YOGA AND PHYSIOTHERAPY FOR ACL - 12 WEEK REHABILITATION PROGRESS OF AN INJURED YOUNG ALPINE SKIER. Br J Sports Med 2016. [DOI: 10.1136/bjsports-2016-096952.25] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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44
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Shaw A, Hall J, Ravi S. Random colonic biopsies for chronic diarrhoea – A numbers needed to investigate approach. Int J Surg 2016. [DOI: 10.1016/j.ijsu.2016.08.155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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45
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Jotwani A, Ravi S, Vallinayagam S, Ayyalusamy A, Reddy R, Mishra A, Lahiri D, Jain A, Reddy K, J N, Rawat S. Application of Lean Principles to Improve High-Precision Radiation Treatment Process and Patient Experience in a High-Volume Cancer Center. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.1645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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46
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Sudhakar K, Thirupathi G, Balakishan A, Narsima chary S, Ravi S. Facile synthesis of novel (1-Aryl/alkyl-1H-1,2,3-triazol- 4-yl)methyl-2-bromo-4-methylthiazole-5-carboxylates by Cu(I) catalyzed click reaction. RUSS J GEN CHEM+ 2016. [DOI: 10.1134/s1070363216070306] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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47
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Ashok D, Elsanoosi M, Alanab BFH, Sarasija M, Ravi S. Solvent-free microwave assisted synthesis of morpholine–piperidine–pyrrolidine annulated quinoline-naphthyl based chalcones and their antimicrobial activity. RUSS J GEN CHEM+ 2016. [DOI: 10.1134/s1070363216050236] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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48
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Duran CL, Lee DW, Jung JU, Ravi S, Pogue CB, Toussaint LG, Bayless KJ, Sitcheran R. NIK regulates MT1-MMP activity and promotes glioma cell invasion independently of the canonical NF-κB pathway. Oncogenesis 2016; 5:e231. [PMID: 27270613 PMCID: PMC4945740 DOI: 10.1038/oncsis.2016.39] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Accepted: 05/03/2016] [Indexed: 12/25/2022] Open
Abstract
A growing body of evidence implicates the noncanonical NF-κB pathway as a key driver of glioma invasiveness and a major factor underlying poor patient prognoses. Here, we show that NF-κB-inducing kinase (NIK/MAP3K14), a critical upstream regulator of the noncanonical NF-κB pathway, is both necessary and sufficient for cell-intrinsic invasion, as well as invasion induced by the cytokine TWEAK, which is strongly associated with tumor pathogenicity. NIK promotes dramatic alterations in glioma cell morphology that are characterized by extensive membrane branching and elongated pseudopodial protrusions. Correspondingly, NIK increases the phosphorylation, enzymatic activity and pseudopodial localization of membrane type-1 matrix metalloproteinase (MT1-MMP/MMP14), which is associated with enhanced tumor cell invasion of three-dimensional collagen matrices. Moreover, NIK regulates MT1-MMP activity in cells lacking the canonical NF-κB p65 and cRel proteins. Finally, increased expression of NIK is associated with elevated MT1-MMP phosphorylation in orthotopic xenografts and co-expression of NIK and MT1-MMP in human tumors is associated with poor glioma patient survival. These data reveal a novel role of NIK to enhance pseudopodia formation, MT1-MMP enzymatic activity and tumor cell invasion independently of p65. Collectively, our findings underscore the therapeutic potential of approaches targeting NIK in highly invasive tumors.
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Affiliation(s)
- C L Duran
- Department of Molecular and Cellular Medicine, Texas A&M Health Science Center, College Station, TX, USA.,Interdisciplinary Program in Genetics, Texas A&M University, College Station, TX, USA
| | - D W Lee
- Department of Molecular and Cellular Medicine, Texas A&M Health Science Center, College Station, TX, USA
| | - J-U Jung
- Department of Molecular and Cellular Medicine, Texas A&M Health Science Center, College Station, TX, USA.,Medical Sciences Graduate Program, Texas A&M Health Science Center, College Station, TX, USA
| | - S Ravi
- Department of Molecular and Cellular Medicine, Texas A&M Health Science Center, College Station, TX, USA
| | - C B Pogue
- Department of Molecular and Cellular Medicine, Texas A&M Health Science Center, College Station, TX, USA
| | - L G Toussaint
- Department of Neuroscience and Experimental Therapeutics, Texas A&M Health Science Center, College Station, TX, USA.,The Texas Brain and Spine Institute, Bryan, TX, USA
| | - K J Bayless
- Department of Molecular and Cellular Medicine, Texas A&M Health Science Center, College Station, TX, USA.,Interdisciplinary Program in Genetics, Texas A&M University, College Station, TX, USA.,Medical Sciences Graduate Program, Texas A&M Health Science Center, College Station, TX, USA
| | - R Sitcheran
- Department of Molecular and Cellular Medicine, Texas A&M Health Science Center, College Station, TX, USA.,Interdisciplinary Program in Genetics, Texas A&M University, College Station, TX, USA.,Medical Sciences Graduate Program, Texas A&M Health Science Center, College Station, TX, USA.,The Texas Brain and Spine Institute, Bryan, TX, USA
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49
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Ashok D, Ravi S, Lakshmi BV, Ganesh A, Adam S. Microwave assisted synthesis of (E)-1-(2-((1-benzyl-1H-1,2,3-triazol-4-yl)methoxy)phenyl)-3-(9-ethyl-9H-carbazol-3-yl)prop-2-en-1-ones and their antimicrobial activity. Russ J Bioorg Chem 2016. [DOI: 10.1134/s1068162016030043] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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50
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Natchimuthu V, Jayalatha KA, Ravi S. Characterizing the molecular interaction of perfluorocarbons with carbamazepine and benzodiazepine using photo-acoustic studies. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.02.038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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