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Jain A, Sharma P, Sivakumar N, Devi P, Gupta S, Chandra S. Role of HIF-1α in Ameloblastoma: A Systematic Review. Indian J Otolaryngol Head Neck Surg 2023; 75:3136-3145. [PMID: 37974737 PMCID: PMC10646133 DOI: 10.1007/s12070-023-03928-6] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Accepted: 05/31/2023] [Indexed: 11/19/2023] Open
Abstract
Hypoxia-inducible factor-1α is a transcriptional protein that has been extensively researched in human cancers whose overexpression is found to be associated with unfavorable prognosis. Contemporary studies have proved its vital role in ameloblastoma by correlating its expression with the aggressiveness of the tumor. Therefore, an attempt was made to explore its significance in the malignant transformation and prognosis of ameloblastoma. The present systematic review aimed to understand the impact of HIF-1α in AMB which might lead to favorable outcomes in the treatment. An electronic search was carried out using PubMed, Scopus, Google scholar, Cochrane library, and EMBASE databases. Original articles from all languages involving HIF-1α in AMB were scrutinized by two independent authors. Data were compiled and tabulated in Microsoft Excel and the Risk of bias was analyzed using the JBI tool. Twelve eligible articles were included for the quantitative analysis comprising 305 cases of AMB in which HIF-1α expression was studied for various characteristics like pattern, intensity, and site of immunoexpression which were found to be increased with an increase in the aggressiveness of AMB. It was concluded that HIF-1α is proven to have a crucial role in the progression and aggressiveness of AMB. Extended research regarding the crucial role of HIF-1α in the initiation of tumors and therapies aiming at HIF-1α in AMB cases might show promising outcomes in the future.
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Affiliation(s)
- Ayushi Jain
- Dept of Oral Pathology & Microbiology and Forensic Odontology, King George’s Medical University, Lucknow, 226003 UP India
| | - Pooja Sharma
- Dept of Oral Pathology & Microbiology and Forensic Odontology, King George’s Medical University, Lucknow, 226003 UP India
| | - N Sivakumar
- Dept of Oral Pathology & Microbiology and Forensic Odontology, CDER, All India Institute of Medical Sciences, New Delhi, India
| | - Priya Devi
- Dept of Oral Pathology & Microbiology and Forensic Odontology, King George’s Medical University, Lucknow, 226003 UP India
| | - Shalini Gupta
- Dept of Oral Pathology & Microbiology and Forensic Odontology, King George’s Medical University, Lucknow, 226003 UP India
| | - Shaleen Chandra
- Dept of Oral Pathology & Microbiology and Forensic Odontology, King George’s Medical University, Lucknow, 226003 UP India
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Pandiar D, Krishnan RP, Sivakumar N. The enigmatic sub-epithelial CD34+ cell rich zone of primordial odontogenic tumor (POT): Plausible role and significance. J Stomatol Oral Maxillofac Surg 2023; 124:101436. [PMID: 36918124 DOI: 10.1016/j.jormas.2023.101436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Accepted: 03/08/2023] [Indexed: 03/14/2023]
Affiliation(s)
- Deepak Pandiar
- Department of Oral Pathology and Microbiology, Saveetha Dental College and Hospitals, Chennai, Tamil Nadu 600077, India.
| | - Reshma Poothakulath Krishnan
- Department of Oral Pathology and Microbiology, Saveetha Dental College and Hospitals, Chennai, Tamil Nadu 600077, India
| | - N Sivakumar
- Department of Oral Pathology and Microbiology, King George's Medical University, Lucknow, Uttar Pradesh, India
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Aruna P, Patil SS, Muthu MS, Vettriselvi V, Arockiam S, Kirubakaran R, Sivakumar N. Association between polymorphisms of immune response genes and early childhood caries - systematic review, gene-based, gene cluster, and meta-analysis. J Genet Eng Biotechnol 2023; 21:124. [PMID: 37971556 PMCID: PMC10654314 DOI: 10.1186/s43141-023-00566-x] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Accepted: 10/26/2023] [Indexed: 11/19/2023]
Abstract
BACKGROUND Early childhood caries is a significant public health concern affecting about 600 million children globally. The etiology of early childhood caries can be explained as an interplay between genetic and environmental factors. Single nucleotide polymorphisms are the most common variations in the human genome. Genetic variations of immune response genes can modify the defense response of the host, and alter the susceptibility to bacterial colonization of the oral cavity and early childhood caries. The aim of this systematic review is to identify genetic variants of immune response genes associated with early childhood caries. RESULTS A total of 7124 articles were identified by conducting an elaborate search across various electronic databases and genome-wide association studies databases. Subsequent to exclusion at various stages, fifteen articles qualified to be included into the present review. Risk of bias assessment was done with the Q-genie tool. Quantitative synthesis revealed that the odds ratio for TT and CC genotypes of rs11362 was 1.07 (0.67-1.71) and 1.16 (0.84-1.60), respectively. Gene-based analysis revealed a statistically significant association between variants of tumor necrosis factor-alpha gene and T-cell receptor alpha variable 4 locus with early childhood caries. Gene clustering showed the presence of three functional clusters. To comprehend the protein-protein interaction, the bioinformatic tool of "Search Tools for the Retrieval of Interacting Genes and Proteins" was used. Among the biological processes and the reactome pathways, complement activation through the lectin pathway showed the highest strength of association with early childhood caries. To understand the interaction and functionality of the genes, "gene function prediction using Multiple Association Network Integration Algorithm" was used, which revealed that the genes were linked by physical interaction (39.34%) and through co-expression (34.88%). CONCLUSIONS Genotype TT of rs7217186 of arachidonate 15-lipoxygenase gene was a risk factor for early childhood caries. Multiple genetic variants of T-cell receptor alpha variable 4 locus and tumor necrosis factor-alpha gene were associated with increased susceptibility to early childhood caries. Polymorphisms of genes regulating the lectin pathway of complement activation can modify the susceptibility to early childhood caries.
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Affiliation(s)
- P Aruna
- Centre for Early Childhood Caries Research, Department of Pediatric and Preventive Dentistry, Sri Ramachandra Institute of Higher Education and Research, Chennai, India
- Department of Pediatric and Preventive Dentistry, Indira Gandhi Institute of Dental Sciences, Sri Balaji Vidyapeeth, Pondicherry, India
| | - Sneha S Patil
- Department of Environmental Health Engineering, Faculty of Public Health, Sri Ramachandra Institute of Higher Education and Research, Chennai, India
- Department of Pediatric and Preventive Dentistry, Dr. D.Y. Patil Dental College and Hospital, Dr. D.Y. Patil Vidyapeeth, Sant-Tukaram Nagar, Pimpri, Pune, India
| | - M S Muthu
- Centre for Early Childhood Caries Research, Department of Pediatric and Preventive Dentistry, Sri Ramachandra Institute of Higher Education and Research, Chennai, India.
- Centre of Medical and Bio-Allied Health Sciences Research, Ajman University, Ajman, United Arab Emirates.
| | - V Vettriselvi
- Department of Human Genetics, Sri Ramachandra Institute of Higher Education and Research, Chennai, India
| | - Selva Arockiam
- Department of Orthodontics, Meenakshi Ammal Dental College and Hospital, Chennai, India
| | - R Kirubakaran
- South Asian Cochrane Network and Centre. Christian Medical College, Vellore, India
| | - N Sivakumar
- Department of Pediatric and Preventive Dentistry, Narayana Dental College and Hospital, Nellore, India
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Sharma K, Sharma P, Sivakumar N, Gupta S, Chandra S. Primary Follicular Lymphoma of Anterior Maxilla Rectifying the Importance of Diagnostic Algorithm: A Case Report. Indian J Otolaryngol Head Neck Surg 2023; 75:2496-2499. [PMID: 37636735 PMCID: PMC10447834 DOI: 10.1007/s12070-023-03774-6] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Accepted: 04/03/2023] [Indexed: 08/29/2023] Open
Abstract
Primary Follicular Lymphoma of the oral cavity is one of the rarest variants of non-Hodgkin's lymphoma b-cell subtype. Now a days, increased incidence of extranodal occurrence in oral cavity and its conjoining behavior with epithelial malignancies possess the need for precise and timely diagnosis of the entity to prevent abrupt over-treatment. In this string, we report a case of primary follicular lymphoma of oral cavity which initially masqueraded oral squamous cell carcinoma but later its diagnosis as follicular lymphoma led to early treatment of the patient which led to good prognosis. Supplementary Information The online version contains supplementary material available at 10.1007/s12070-023-03774-6.
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Affiliation(s)
- Kriti Sharma
- Department of Oral Pathology, Microbiology and Forensic Odontology, King George’s Medical University, Lucknow, Uttar Pradesh 226003 India
| | - Pooja Sharma
- Department of Oral Pathology, Microbiology and Forensic Odontology, King George’s Medical University, Lucknow, Uttar Pradesh 226003 India
| | - N Sivakumar
- Department of Oral Pathology, Microbiology and Forensic Odontology, CDER, All India Institute of Medical Sciences, New Delhi, 110029 India
| | - Shalini Gupta
- Department of Oral Pathology, Microbiology and Forensic Odontology, King George’s Medical University, Lucknow, Uttar Pradesh 226003 India
| | - Shaleen Chandra
- Department of Oral Pathology, Microbiology and Forensic Odontology, King George’s Medical University, Lucknow, Uttar Pradesh 226003 India
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Sivakumar N, Sharma P, Chandra S, Gupta S, Samadi FM, Baghel S. Clinicopathological and Molecular Characteristics of Intraosseous Rhabdomyosarcoma Involving Head and Neck Region: A Systematic Review and Meta-Analysis. Pediatr Dev Pathol 2023:10935266231165636. [PMID: 37082926 DOI: 10.1177/10935266231165636] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 04/22/2023]
Abstract
Rhabdomyosarcoma with TFCP2 rearrangement is a newly introduced spindle cell neoplasm showing predilection for craniofacial bones exhibiting highly aggressive nature and poor prognosis. Therefore, an attempt was made to delineate the entity for improved understanding and treatment outcomes through comprehensive analysis of the clinicopathological and molecular characteristics. An electronic search was carried out using MEDLINE by PubMed, Scopus, Google scholar, Cochrane library, and EMBASE databases. Original articles and case reports involving intraosseous rhabdomyosarcoma arising in head and neck region with TFCP2 fusion were included. Data were compiled and risk of bias was analyzed using JBI tool. Thirteen eligible articles were included for the quantitative analysis, which revealed 33 cases with TFCP2 fusion. Majority of the affected individuals were females (58%) with mandible being the common site. Most of the patients died within few months after diagnosis demonstrating a low mean survival rate (30 months). Odds ratio, overall survival and disease-free survival were calculated and analyzed statistically concluding that intraosseous rhabdomyosarcomas harboring TFCP2 fusion are found to be novel and dreadful neoplasms. The predilection for young age with poor prognosis exhibited by these lesions demand early diagnosis and specific treatment planning to curtail mortality.
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Affiliation(s)
- N Sivakumar
- Department of Oral Pathology, King George's Medical University, Lucknow, Uttar Pradesh, India
| | - Pooja Sharma
- Department of Oral Pathology, King George's Medical University, Lucknow, Uttar Pradesh, India
| | - Shaleen Chandra
- Department of Oral Pathology, King George's Medical University, Lucknow, Uttar Pradesh, India
| | - Shalini Gupta
- Department of Oral Pathology, King George's Medical University, Lucknow, Uttar Pradesh, India
| | - Fahad M Samadi
- Department of Oral Pathology, King George's Medical University, Lucknow, Uttar Pradesh, India
| | - Shilpi Baghel
- Department of Oral Pathology, King George's Medical University, Lucknow, Uttar Pradesh, India
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Keerthika R, Devi A, Kamboj M, Sivakumar N, Vijayakumar G, Narwal A, Girdhar A. Diagnostic Reliability of CRTC1/3::MAML2 Gene Fusion Transcripts in Discriminating Histologically Similar Intraosseous Mucoepidermoid Carcinoma from Glandular Odontogenic Cyst: A Systematic Review and Meta-analysis. Head Neck Pathol 2023; 17:233-245. [PMID: 36357765 PMCID: PMC10063707 DOI: 10.1007/s12105-022-01494-x] [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] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Accepted: 09/09/2022] [Indexed: 11/12/2022]
Abstract
BACKGROUND Intraosseous mucoepidermoid carcinoma (IMEC) and Glandular odontogenic cyst (GOC) are those two pathological entities causing diagnostic dilemma due to the histopathological similarity. An accurate distinction between the two entities is difficult as both presents with a common radiological and histological similarities. The aim of our systematic review was to establish the diagnostic reliability of CRTC1/3::MAML2 gene fusion for the distinction between IMEC and GOC. METHODS A complete electronic literature search was made in MEDLINE by PubMed, Google Scholar, and EMBASE databases. Articles with keywords using molecular genetic findings of CRTC1/3::MAML2 gene fusion transcripts, IMEC and GOC were assessed and included for the systematic review. RESULTS Twelve subgroups having both qualitative and quantitative analysis revealed CRTC1/3::MAML2 sensitivity of 100% and specificity of 70.59% in differentiating GOC and IMEC. Fixed-effects model confirmed translocation-negative cases to have a decreased risk of association with IMEC (combined odds ratio 8.770, 95% confidence interval - 2.45 to 31.45, p < 0.002). CONCLUSIONS The current evidence supports that in all cases with positive gene fusion transcript of the CRTC1/3::MAML2 was specific for IMEC and was significantly differentiating it from GOC. Whereas cases of IMEC with negative gene fusion transcript pose diagnostic difficulty in differentiating from a GOC which is negative for CRTC1/3::MAML2 expression.
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Affiliation(s)
- R. Keerthika
- Department of Oral Maxillofacial Pathology and Microbiology, Post Graduate Institute of Dental Sciences (PGIDS), Rohtak, Haryana 124001 India
| | - Anju Devi
- Department of Oral Maxillofacial Pathology and Microbiology, Post Graduate Institute of Dental Sciences (PGIDS), Rohtak, Haryana 124001 India
| | - Mala Kamboj
- Department of Oral Maxillofacial Pathology and Microbiology, Post Graduate Institute of Dental Sciences (PGIDS), Rohtak, Haryana 124001 India
| | - N. Sivakumar
- Department of Oral and Maxillofacial Pathology & Microbiology, King George’s Medical University, Lucknow, Uttar Pradesh 226003 India
| | - Gopikrishnan Vijayakumar
- Department of Oral Maxillofacial Pathology and Microbiology, Post Graduate Institute of Dental Sciences (PGIDS), Rohtak, Haryana 124001 India
| | - Anjali Narwal
- Department of Oral Maxillofacial Pathology and Microbiology, Post Graduate Institute of Dental Sciences (PGIDS), Rohtak, Haryana 124001 India
| | - Akhil Girdhar
- Department of Oral Maxillofacial Pathology and Microbiology, Post Graduate Institute of Dental Sciences (PGIDS), Rohtak, Haryana 124001 India
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Sharma P, Sivakumar N, Pandiar D. Diagnostic accuracy of pan-TRK immunohistochemistry in differentiating secretory carcinoma from acinic cell carcinoma of salivary gland-A systematic review. J Oral Pathol Med 2023; 52:255-262. [PMID: 36207812 DOI: 10.1111/jop.13373] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 09/18/2022] [Accepted: 09/29/2022] [Indexed: 11/26/2022]
Abstract
BACKGROUND Secretory carcinoma (SC) is a well-established salivary gland malignancy that has earned its popularity for its unique clinicopathological behavior. Although it is an indolent malignancy, few of them have been reported with high grade transformation making it mandatory to differentiate it from its prime histological mimicker, acinic cell carcinoma (AciCC). Recently, many studies have been directed toward validating the sensitivity and specificity of pan-TRK IHC for confirming ETV6::NTRK3 gene fusion in SCs involving salivary gland. AIM The aim of the present systematic review was to establish the diagnostic utility of pan-TRK immunostaining in histological differentiation of SC from AciCC. MATERIAL AND METHODS An electronic search was carried out using MEDLINE by PubMed, Scopus, Google scholar, Trip, Cochrane library and EMBASE databases. Articles in which SC assessed with pan-TRK immunohistochemical expressions were included for systematic review and their staining pattern (cytoplasmic, nuclear and/or combined), sensitivity, specificity, positive as well as negative predictive were gathered. Risk of bias was analyzed for each study using QUADAS-2 tool. RESULTS Thirteen eligible articles were included for the quantitative analysis, which revealed positive immunostaining of pan-TRK by nearly all the ETV6::NTRK3 fusion prevalent SCs alongside negative expression in almost all the cases of AciCC with 100% of sensitivity as well as specificity. CONCLUSION The evidence from the included studies supports that pan-TRK immunostaining could be used as a reliable preliminary screening tool for discerning SC from AciCC. PROSPERO No: CRD42022308913.
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Affiliation(s)
- Pooja Sharma
- Department of Oral Pathology, King George's Medical University, Lucknow, India
| | - N Sivakumar
- Department of Oral Pathology, King George's Medical University, Lucknow, India
| | - Deepak Pandiar
- Department of Oral Pathology and Microbiology, Saveetha Dental College and Hospitals, Chennai, India
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Kamboj M, Rathee R, Narwal A, Devi A, Gupta A, Sivakumar N. Primary Oral Histoplasmosis in Immunocompetent Host: Case Series with Review of Literature. Indian J Otolaryngol Head Neck Surg 2022; 74:5639-5644. [PMID: 36742512 PMCID: PMC9895471 DOI: 10.1007/s12070-021-02974-2] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Accepted: 10/31/2021] [Indexed: 02/07/2023] Open
Abstract
Histoplasmosis, a systemic mycosis caused by Histoplasma capsulatum manifests clinically in immunocompromised subjects as acute or chronic pulmonary infection or as a progressive disseminated disease. In oral region it clinically presents as multiple, granular and painful ulcers or verrucous growth. It is rare to find primary oral lesion of histoplasmosis in immunocompetent patient free from systemic disease. In presence of any unusual oral lesion possibility of Histoplasmosis should be considered and prompt diagnosis be attained with exclusion of false negative results as non-specific manifestation of disease may lead to gruesome misdiagnosis of lesion and inadequate treatment. In the present paper two cases of oral histoplasmosis in immunocompetent host have been discussed along with updated review of literature.
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Affiliation(s)
- Mala Kamboj
- Department of Oral and Maxillofacial Pathology and Oral Microbiology, Post Graduate Institute of Dental Sciences, Pt. BD Sharma University of Health Sciences, Rohtak, Haryana India
| | - Renu Rathee
- Department of Oral and Maxillofacial Pathology and Oral Microbiology, Post Graduate Institute of Dental Sciences, Pt. BD Sharma University of Health Sciences, Rohtak, Haryana India
| | - Anjali Narwal
- Department of Oral and Maxillofacial Pathology and Oral Microbiology, Post Graduate Institute of Dental Sciences, Pt. BD Sharma University of Health Sciences, Rohtak, Haryana India
| | - Anju Devi
- Department of Oral and Maxillofacial Pathology and Oral Microbiology, Post Graduate Institute of Dental Sciences, Pt. BD Sharma University of Health Sciences, Rohtak, Haryana India
| | - Ambika Gupta
- Department of Oral and Maxillofacial Pathology and Oral Microbiology, Post Graduate Institute of Dental Sciences, Pt. BD Sharma University of Health Sciences, Rohtak, Haryana India
- Department of Oral Medicine and Radiology, Post Graduate Institute of Dental Sciences, Pt. BD Sharma University of Health Sciences, Rohtak, Haryana India
| | - N. Sivakumar
- Department of Oral and Maxillofacial Pathology and Oral Microbiology, Post Graduate Institute of Dental Sciences, Pt. BD Sharma University of Health Sciences, Rohtak, Haryana India
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Bansal D, Kamboj M, Anand R, Pandiar D, Narwal A, Sivakumar N, Devi A. Association of childhood vaccination with pediatric lichen planus: A systematic review. Int J Dermatol 2021; 62:22-31. [PMID: 34870853 DOI: 10.1111/ijd.15974] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2021] [Revised: 09/21/2021] [Accepted: 10/23/2021] [Indexed: 12/23/2022]
Abstract
Lichen planus (LP) is a chronic T-cell-mediated mucocutaneous inflammatory disease, largely recognized in adults. It is uncommon in children, and the literature present still lacks comprehensive understanding mainly due to underreporting of such cases. LP shows atypical clinical features, when seen in children, mainly affecting the flexor aspect of the wrists, legs, and the oral and genital mucosae. It is largely considered an autoimmune response of the body with various etiologic factors. Its association with vaccination is still an interesting field for research. The focus of the present systematic review was to discover the link of vaccine in the pathogenesis of juvenile LP. An electronic search was carried out using MEDLINE by PubMed, Google Scholar, and Web of Science databases. Articles that reported LP in children with prior records for vaccination were selected for the present systematic review. Twenty-three published articles in the English language were included for the quantitative and qualitative syntheses. The demographic data, specific vaccine history, and clinical details of the lesions were recorded. The existing evidence supports that vaccines could play an important role in etiopathogenesis of pediatric LP.
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Affiliation(s)
- Deepty Bansal
- Department of Oral and Maxillofacial Pathology and Microbiology, Post Graduate Institute of Dental Sciences, Pt B.D. Sharma University of Health Sciences, Rohtak, India
| | - Mala Kamboj
- Department of Oral and Maxillofacial Pathology and Microbiology, Post Graduate Institute of Dental Sciences, Pt B.D. Sharma University of Health Sciences, Rohtak, India
| | - Rahul Anand
- Department of Oral and Maxillofacial Pathology and Microbiology, Post Graduate Institute of Dental Sciences, Pt B.D. Sharma University of Health Sciences, Rohtak, India
| | - Deepak Pandiar
- Department of Oral and Maxillofacial Pathology, Saveetha Dental College and Hospitals, Saveetha University (Tamil Nadu), Chennai, India
| | - Anjali Narwal
- Department of Oral and Maxillofacial Pathology and Microbiology, Post Graduate Institute of Dental Sciences, Pt B.D. Sharma University of Health Sciences, Rohtak, India
| | - N Sivakumar
- Department of Oral and Maxillofacial Pathology and Microbiology, Post Graduate Institute of Dental Sciences, Pt B.D. Sharma University of Health Sciences, Rohtak, India
| | - Anju Devi
- Department of Oral and Maxillofacial Pathology and Microbiology, Post Graduate Institute of Dental Sciences, Pt B.D. Sharma University of Health Sciences, Rohtak, India
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Raj Priyadarshini R, Sivakumar N. Cluster head selection based on Minimum Connected Dominating Set and Bi-Partite inspired methodology for energy conservation in WSNs. Journal of King Saud University - Computer and Information Sciences 2021. [DOI: 10.1016/j.jksuci.2018.08.009] [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] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Sivakumar N, Narwal A, Pandiar D, Devi A, Anand R, Bansal D, Kamboj M. Diagnostic utility of p63/p40 in the histologic differentiation of salivary gland tumors: A systematic review. Oral Surg Oral Med Oral Pathol Oral Radiol 2021; 133:189-198. [PMID: 34518135 DOI: 10.1016/j.oooo.2021.07.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 07/05/2021] [Accepted: 07/13/2021] [Indexed: 01/04/2023]
Abstract
OBJECTIVE Salivary gland tumors are a heterogeneous group of neoplasms with complex clinicopathologic behavior. These tumors often show an extremely diverse morphology and significant histologic patterns, making diagnosis a difficult task. Owing to the considerable differences in prognosis, treatment, and follow-up, accurately distinguishing these histologic mimickers is imperative. The aim of the present systematic review was to establish the diagnostic utility of p63/p40 immunostaining in histologic differentiation of salivary gland tumors. STUDY DESIGN An electronic search was carried out using MEDLINE by PubMed, Scopus, Google Scholar, Trip, Cochrane Library, and EMBASE databases. Articles in which both p63 and p40 immunohistochemical expressions were assessed were included for systematic review and their sensitivity and specificity were calculated. Risk of bias was analyzed for each study using the Quality Assessment of Diagnostic Accuracy Studies tool. RESULTS Ten eligible articles were included in the quantitative synthesis, which revealed a concordant positivity of p63 and p40 by nearly all cases of adenoid cystic carcinoma, pleomorphic adenoma, and mucoepidermoid carcinoma and most polymorphous adenocarcinomas showed discordant immunohistochemical expression (p63+/p40-). CONCLUSIONS The current evidence supports that integrated immunostaining of p63/p40 is a valuable adjunct for discerning enigmatic salivary gland tumors with true myoepithelial and/or squamous differentiation.
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Affiliation(s)
- N Sivakumar
- Junior Resident, Department of Oral Pathology and Microbiology, Post Graduate Institute of Dental Sciences, Rohtak, Haryana, India.
| | - Anjali Narwal
- Professor, Department of Oral Pathology and Microbiology, Post Graduate Institute of Dental Sciences, Rohtak, Haryana, India
| | - Deepak Pandiar
- Associate Professor, Department of Oral Pathology and Microbiology, Saveetha Dental College and Hospitals, Poonamallee High Road, Chennai, Tamil Nadu, India
| | - Anju Devi
- Associate Professor, Department of Oral Pathology and Microbiology, Post Graduate Institute of Dental Sciences, Rohtak, Haryana, India
| | - Rahul Anand
- Senior Resident, Department of Oral Pathology and Microbiology, Post Graduate Institute of Dental Sciences, Rohtak, Haryana, India
| | - Deepty Bansal
- Junior Resident, Department of Oral Pathology and Microbiology, Post Graduate Institute of Dental Sciences, Rohtak, Haryana, India
| | - Mala Kamboj
- Senior Professor and Head, Department of Oral Pathology and Microbiology, Post Graduate Institute of Dental Sciences, Rohtak, Haryana, India
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Jayachitra J, Balamurugan A, Richards Joshua J, Sharmila V, Sivakumar N, Alshahrani T, Shkir M. Enhancing the electrochemical performance by structural evolution in O3- NaFe1-xMgxO2 cathodes for sodium ion batteries. INORG CHEM COMMUN 2021. [DOI: 10.1016/j.inoche.2021.108528] [Citation(s) in RCA: 1] [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: 10/22/2022]
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Sivakumar N, Narwal A, Kumar S, Kamboj M, Devi A, Pandiar D, Bhardwaj R. Application of the Bethesda system of reporting for cervical cytology to evaluate human papilloma virus induced changes in oral leukoplakia, oral squamous cell carcinoma, and oropharyngeal squamous cell carcinoma: A cytomorphological and genetic study. Diagn Cytopathol 2021; 49:1036-1044. [PMID: 34165918 DOI: 10.1002/dc.24813] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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: 01/21/2021] [Revised: 05/10/2021] [Accepted: 06/16/2021] [Indexed: 12/15/2022]
Abstract
BACKGROUND Human papilloma virus (HPV) has a well-established carcinogenic role in certain head and neck cancers. These HPV associated cancers possess unique clinicopathological behavior and exhibits better prognosis than their negative counterparts. Detection through polymerase chain reaction (PCR) has been considered as the "gold standard" but imposes burden in low resource settings. Therefore, in the present study, we assessed the validity of cytomorphological features for the detection of HPV in oral leukoplakia (OL), oral squamous cell carcinoma (OSCC), and oropharyngeal squamous cell carcinoma (OPSCC). METHODOLOGY This study included 63 subjects comprising of 25 OL, 26 OSCC, and 12 OPSCC cases. Exfoliated cells were collected and processed for PCR followed by Papanicolaou staining and subsequent grading. Additionally the non-classical signs were evaluated and statistical analysis included Chi-square and Spearman's test. RESULT 23/63 (36.5%) cases showed PCR positivity for HPV16. Most of the cytomorphological features showed significant correlation for the presence of HPV. A greater sensitivity and specificity was observed in the Bethesda system for reporting cervical cytology (TBS) than the Papanicolaou grading system. CONCLUSION We conclude that the non-classic cytological features could be employed in the detection of HPV in low resource settings with improved sensitivity. Liquid based cytology graded using TBS could be suitable for oral cytology in the detection of early atypical changes.
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Affiliation(s)
- N Sivakumar
- Department of Oral Pathology and Microbiology, Post Graduate Institute of Dental Sciences, Rohtak, India
| | - Anjali Narwal
- Department of Oral Pathology and Microbiology, Post Graduate Institute of Dental Sciences, Rohtak, India
| | - Sanjay Kumar
- Department of Pathology, Post Graduate Institute of Medical Sciences, Rohtak, India
| | - Mala Kamboj
- Department of Oral Pathology and Microbiology, Post Graduate Institute of Dental Sciences, Rohtak, India
| | - Anju Devi
- Department of Oral Pathology and Microbiology, Post Graduate Institute of Dental Sciences, Rohtak, India
| | - Deepak Pandiar
- Department of Oral Pathology, Saveetha Dental College and Hospital, Chennai, India
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Pavithra S, Priya A, Jayachandran M, Vijayakumar T, Maiyalagan T, Jayachitra J, Sivakumar N. Influence of aloe-vera gel mediated CuO coated LiNiPO4 cathode material in rechargeable battery applications. INORG CHEM COMMUN 2021. [DOI: 10.1016/j.inoche.2021.108459] [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: 11/30/2022]
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Sivakumar N, Narwal A, Kamboj M, Devi A, Kumar S, Bhardwaj R. Molecular and Immunohistochemical Cognizance of HPV16 in Oral Leukoplakia, Oral Squamous Cell Carcinoma and Oropharyngeal Squamous Cell Carcinoma. Head Neck Pathol 2021; 15:882-892. [PMID: 33646558 PMCID: PMC8385043 DOI: 10.1007/s12105-021-01309-5] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Accepted: 02/11/2021] [Indexed: 11/28/2022]
Abstract
Prior studies have established the carcinogenic role of HPV16 and also demonstrated its unique biological behavior in cervical and oropharyngeal squamous cell carcinoma (OPSCC) but its role in oral leukoplakia (OL) and oral squamous cell carcinoma (OSCC) is not well explored. Therefore, in the present study, we assessed HPV16 prevalence using PCR and Anti-HPV16 antibodies for the first time and correlated its biological behavior using p16INK4a and Ki67 proliferation index (PI) in OL, OSCC, and OPSCC. This study included 63 subjects comprising of 25 OL, 26 OSCC, and 12 OPSCC cases. Exfoliated cells were collected and processed for PCR followed by immunohistochemistry with primary antibodies p16INK4a, Anti-HPV16, and Ki67. The expressions were evaluated and statistical analysis included Chi-square and Spearman's test. Cumulatively 37% (OL-7%, OSCC-14% & OPSCC-16%) of cases showed positive PCR expression. PCR positivity was observed to be significantly higher (p 0.00) in OPSCC (9/12) than OSCC (9/26) and OL (5/25) cases. Overall immunohistochemical expression of p16INK4a, Anti-HPV16, and Ki67 were significantly (p 0.02) higher in HPV16 (PCR) positive cases. HPV16 + OSCC cases showed higher grades of p16INK4a and Ki67 expression. We have demonstrated a prevalence of HPV16 in OL, OSCC, and OPSCC through PCR, which may be concluded as a gold standard for the detection of HPV16 DNA.
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Affiliation(s)
- N. Sivakumar
- Department of Oral Pathology and Microbiology, Post Graduate Institute of Dental Sciences, Rohtak, Haryana 124001 India
| | - Anjali Narwal
- Department of Oral Pathology and Microbiology, Post Graduate Institute of Dental Sciences, Rohtak, Haryana 124001 India
| | - Mala Kamboj
- Department of Oral Pathology and Microbiology, Post Graduate Institute of Dental Sciences, Rohtak, Haryana 124001 India
| | - Anju Devi
- Department of Oral Pathology and Microbiology, Post Graduate Institute of Dental Sciences, Rohtak, Haryana 124001 India
| | - Sanjay Kumar
- Department of Pathology, Post Graduate Institute of Medical Sciences, Rohtak, Haryana 124001 India
| | - Rashmi Bhardwaj
- Centre for Medical Biotechnology, MDU, Rohtak, Haryana 124001 India
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Sivakumar N, Bansal D, Narwal A, Kamboj M, Devi A. Gender determination analysis using anthropometrical dimensions of 2D:4D, foot index and mandibular canine index. J Oral Maxillofac Pathol 2021; 24:510-516. [PMID: 33967489 PMCID: PMC8083409 DOI: 10.4103/jomfp.jomfp_285_19] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Revised: 04/24/2020] [Accepted: 08/05/2020] [Indexed: 11/04/2022] Open
Abstract
Introduction Sex determination is a challenge for forensic experts during mass disasters. Teeth are an excellent source in both living and nonliving population, where bodies are mutilated beyond recognition. Mandibular canines can be employed for gender determination in such situations. Similarly, second-to-fourth digit ratio (2D:4D) and foot index (FI) are sexually dimorphic and differ in males and females. Mandibular canine index (MCI), 2D:4D and FI are considered quick, easy and reproducible methods for determining the sex of an individual. Aim This study aimed to determine the combined role of MCI, 2D:4D and FI in denoting gender identity and establish their correlation. Materials and Methods The present study comprised of 100 dental students (50 males and 50 females) of our institution, aged 19-25 years, with specific inclusion and exclusion criteria. The measurements were done using a Vernier caliper, a divider and a ruler, and MCI, 2D:4D and FI were calculated using their specific formulae. The calculated values of FI, MCI and 2D:4D were subjected to statistical analysis. Results There was a statistically significant difference observed between left MCI (P < 0.05), right and left 2D:4D and FI (P < 0.05). The results revealed that 2D:4D was less, whereas MCI and FI were higher in males than in females. The observed MCI was compared with standard MCI, and left MCI revealed higher sexual dimorphic characteristics (15.2%). Although the overall correlation between 2D:4D, FI and MCI was insignificant, the measurements were comparable. Conclusion This study indicated that the anthropometric dimensions of 2D:4D, FI and MCI can be used for sex determination independently with accurate results.
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Affiliation(s)
- N Sivakumar
- Department of Oral and Maxillofacial Pathology and Oral Microbiology, Post Graduate Institute of Dental Sciences, Pt. BD Sharma University of Health Sciences, Rohtak, Haryana, India
| | - Deepty Bansal
- Department of Oral and Maxillofacial Pathology and Oral Microbiology, Post Graduate Institute of Dental Sciences, Pt. BD Sharma University of Health Sciences, Rohtak, Haryana, India
| | - Anjali Narwal
- Department of Oral and Maxillofacial Pathology and Oral Microbiology, Post Graduate Institute of Dental Sciences, Pt. BD Sharma University of Health Sciences, Rohtak, Haryana, India
| | - Mala Kamboj
- Department of Oral and Maxillofacial Pathology and Oral Microbiology, Post Graduate Institute of Dental Sciences, Pt. BD Sharma University of Health Sciences, Rohtak, Haryana, India
| | - Anju Devi
- Department of Oral and Maxillofacial Pathology and Oral Microbiology, Post Graduate Institute of Dental Sciences, Pt. BD Sharma University of Health Sciences, Rohtak, Haryana, India
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Selvapandiyan M, Balaji G, Sivakumar N, Prasath M, Sagadevan S. Influence of pomegranate inclusion towards the electrochemical performance of lithium hexafluorophosphate in lithium-ion batteries. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2020.138118] [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: 11/29/2022]
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Sivakumar N, Kanchanadevi J, Govindarajan M, Jayavel R, Anbalagan G. Theoretical investigation on the crystal structure, spectral and optical properties of a novel organic optical material: (Acetoxy) (2-methylphenyl) methylacetate. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128579] [Citation(s) in RCA: 1] [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: 11/27/2022]
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Pavithra S, Sivaraj P, Arjunan P, Prabhu S, Ramesh R, Yuvaraj P, Sivakumar N. Surface Modification and Electrochemical Performance of Al2O3 Coated and Ni-Doped Spinel LiMn2O4 for Aqueous Rechargeable Battery Applications. Surf Engin Appl Electrochem 2020. [DOI: 10.3103/s1068375520040122] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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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Padmini N, Ajilda AAK, Prabakaran P, Sivakumar N, Selvakumar G. Efficacy of marine cyanobacterium Oxynema thaianum ALU PBC5 against multi drug resistant Gram negative pathogens. J Appl Microbiol 2020; 130:50-60. [PMID: 32594639 DOI: 10.1111/jam.14760] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 04/21/2020] [Revised: 06/08/2020] [Accepted: 06/22/2020] [Indexed: 11/30/2022]
Abstract
AIM Emergence of extended antibiotic resistance among several human bacterial pathogens often leads to the failure of existing antibiotics to treat bacterial infections worldwide. Hence, the present study is aimed to explore antibacterial activity of marine cyanobacterium against MDR pathogens. METHODS AND RESULTS The cyanobacterial samples were collected and isolated from Thondi Palk Strait region. The isolate was subjected to polarity based solvent extraction and checked for their antibacterial activity against test bacterial pathogens. The active principles from chloroform extract of Oxynema thaianum (CEOT) were partially purified through thin layer chromatography (TLC). The active principle with highest activity was further characterized by FTIR, high performance liquid chromatography (HPLC) and gas chromatography mass spectrometry (GC-MS) analysis. Among the eight extracts tested, CEOT showed effective zone of clearance against ESBL producing Escherichia coli and Klebsiella pneumoniae in disc diffusion method. In TLC, all the purified five fractions were eluted and tested for their antibacterial activity against test pathogens. The third fraction showing maximum activity was subjected to HPLC analysis for checking its purity. In GC-MS analysis, 9-octadecenoic acid, methyl ester and hexadecanoic acid were identified as the major chemical compounds. CONCLUSION Hence, the present study was concluded that O. thaianum ALU PBC5 is a promising agent to treat ESBL producing MDR bacterial pathogens. SIGNIFICANCE AND IMPACT OF THE STUDY This is the pioneer study on screening and isolation of bioactive compounds from the marine cyanobacteria against MDR pathogens such as E. coli and K. pneumoniae. Here, 9-octadecenoic acid, methyl ester and hexadecanoic acid were identified as the major chemical compounds through TLC, FTIR, HPLC and GC-MS. From this screen, we identified the bioactive compounds against ESBL producing multidrug resistant pathogens such as E. coli and K. pneumoniae.
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Affiliation(s)
- N Padmini
- Department of Microbiology, Science Campus, Alagappa University, Karaikudi, Tamil Nadu, India
| | - A A K Ajilda
- Department of Microbiology, Science Campus, Alagappa University, Karaikudi, Tamil Nadu, India
| | - P Prabakaran
- Department of Microbiology, Science Campus, Alagappa University, Karaikudi, Tamil Nadu, India
| | - N Sivakumar
- School of Biotechnology, Madurai Kamaraj University, Madurai, Tamil Nadu, India
| | - G Selvakumar
- Department of Microbiology, Science Campus, Alagappa University, Karaikudi, Tamil Nadu, India
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Sivakumar N, Kanagathara N, Marchewka MK, Drozd M, Jayavel R, Anbalagan G. The theoretical and experimental vibrational studies of thiourea and silver nitrate (2:1) complex. Spectrochim Acta A Mol Biomol Spectrosc 2018; 204:717-725. [PMID: 29986318 DOI: 10.1016/j.saa.2018.06.035] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Revised: 06/07/2018] [Accepted: 06/10/2018] [Indexed: 06/08/2023]
Abstract
The theoretical and experimental vibrational studies for poly thiourea silver nitrate (2:1) complex using DFT method are performed on the basis of experimental data. During the geometry optimization process one equilibrium structure was found. The Mulliken charges, harmonic vibrational frequencies, Infrared and Raman intensities were calculated on the basis of quantum chemical density functional calculations using firefly (PC GAMESS) Version 7.1G. The clear - cut assignments of observed bands are performed on the basis of potential energy distribution (PED) analysis. Highest Occupied Molecular Orbital (HOMO) and the Lowest Occupied Molecular Orbital (LUMO) are obtained and graphically illustrated with minimum energy. The energy difference between HOMO and LUMO is analyzed. The other molecular properties like molecular electrostatic potential, Mulliken charges and thermodynamic properties of the title compound have also been calculated.
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Affiliation(s)
- N Sivakumar
- Crystal Growth Centre, Anna University, Chennai 600025, India; Department of Physics, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences, Thandalam, Chennai 602 105, India
| | - N Kanagathara
- Department of Physics, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences, Thandalam, Chennai 602 105, India
| | - M K Marchewka
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50-950 Wroclaw, 2, P.O. Box 937, Poland
| | - M Drozd
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50-950 Wroclaw, 2, P.O. Box 937, Poland
| | - R Jayavel
- Crystal Growth Centre, Anna University, Chennai 600025, India
| | - G Anbalagan
- Department of Nuclear Physics, University of Madras, Chennai 600 025, India.
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Rao RT, Nair P, Sivakumar N, Jayakumar K. Interspecies comparative epidemiology of Livestock Associated Staphylococcus aureus among bovine and ovine origins - A public health perspective. Ann Epidemiol 2018. [DOI: 10.1016/j.annepidem.2018.06.039] [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: 10/28/2022]
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Gajalakshmi B, Induja S, Sivakumar N, Raghavan P. Guar Gum Stabilized Copper Oxide Nanoparticles with Enhanced Thermal and Antimicrobial Properties. ACTA ACUST UNITED AC 2018. [DOI: 10.14233/ajchem.2018.21200] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Sivakala K, Jose P, Thinesh T, Anandham R, Sivakumar N, Jebakumar S. Metagenomic analysis of microbial heterogeneity and stress response Mechanisms in Desert. Can J Biotech 2017. [DOI: 10.24870/cjb.2017-a121] [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: 11/20/2022] Open
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Herrmann Fabian C, Sivakumar N, Schmidt Thomas J. In silico identification and in vitro evaluation of new flavonoid inhibitors of pteridine reductase I from Leishmania major (LmPTR1). Am J Transl Res 2017. [DOI: 10.1055/s-0037-1608036] [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: 10/18/2022]
Affiliation(s)
- C Herrmann Fabian
- Institute of Pharmaceutical Biology and Phytochemistry (IPBP), University of Münster, PharmaCampus Correnstraße 48, D-48149 Münster, Germany, Münster, Germany
| | - N Sivakumar
- Institute of Pharmaceutical Biology and Phytochemistry (IPBP), University of Münster, PharmaCampus Correnstraße 48, D-48149 Münster, Germany, Münster, Germany
| | - J Schmidt Thomas
- Institute of Pharmaceutical Biology and Phytochemistry (IPBP), University of Münster, PharmaCampus Correnstraße 48, D-48149 Münster, Germany, Münster, Germany
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Selvankumar T, Sudhakar C, Govindaraju M, Selvam K, Aroulmoji V, Sivakumar N, Govarthanan M. Process optimization of biogas energy production from cow dung with alkali pre-treated coffee pulp. 3 Biotech 2017; 7:254. [PMID: 28726218 DOI: 10.1007/s13205-017-0884-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Accepted: 07/11/2017] [Indexed: 10/19/2022] Open
Abstract
Biogas production from cow dung with co-substrate agricultural waste is one of the most demanding technologies for generating energy in a sustainable approach considering eco-friendly. In the present study, coffee pulp (CP) was pre-treated with 1% NaOH and combined with various proportions of cow dung (CD) to explore its biogas producing potentiality. The optimization of the process was studied using Response surface methodology. Statistics based on 3-D plots were generated to evaluate the changes in the response surface and to understand the relationship between the biogas yield and other parameters. The highest methane production (144 mL/kg) was achieved after 90 h of incubation with 1:3 of CP and CD at 40 °C. Gas chromatography analyzes the chemical compositions of the generated biogas and its post combustion emissions. The chemical composition of the substrates before digestion and after fermentation (biogas spent sludge) were measured in terms of fiber content and the values were noted as, total solids (0.53%), ash content (9.2%), volatile fatty acid (100 mg/L), organic carbon (46%) and a total carbohydrate (179 mg/g). The results of the optimization of biogas production presented in this work found to have significance with the process parameters. The outcome of the study has supported the fact of conventional combustion technology that has to be upgraded to prevent these hazardous emissions into the atmosphere.
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Sri Ramkumar SR, Sivakumar N, Selvakumar G, Selvankumar T, Sudhakar C, Ashokkumar B, Karthi S. Green synthesized silver nanoparticles from Garcinia imberti bourd and their impact on root canal pathogens and HepG2 cell lines. RSC Adv 2017. [DOI: 10.1039/c6ra28328d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Nanoparticle biosynthesis using the extract of medicinal plants in a non-hazardous mode has gained wide attention for various applications in nanomedicine.
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Affiliation(s)
| | - N. Sivakumar
- Department of Molecular Microbiology
- School of Biotechnology
- Madurai Kamaraj University
- Madurai 625 021
- India
| | - G. Selvakumar
- Department of Microbiology
- Alagappa University
- Karaikudi 630003
- India
| | - T. Selvankumar
- PG & Research Department of Biotechnology
- Mahendra Arts and Science College (Autonomous)
- Namakkal 637 501
- India
| | - C. Sudhakar
- PG & Research Department of Biotechnology
- Mahendra Arts and Science College (Autonomous)
- Namakkal 637 501
- India
| | - B. Ashokkumar
- Department of Genetic Engineering
- School of Biotechnology
- Madurai Kamaraj University
- Madurai 625 021
- India
| | - S. Karthi
- Department of Genetic Engineering
- School of Biotechnology
- Madurai Kamaraj University
- Madurai 625 021
- India
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Adizie J, Harrison S, Huntley C, Sivakumar N, Morgan A. 27 Talc pleurodesis via chest drain vs indwelling pleural catheter (IPC) for managing malignant pleural effusions in a district general hospital. Lung Cancer 2016. [DOI: 10.1016/s0169-5002(16)30044-7] [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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Gopika G, Asha AM, Sivakumar N, Balakrishnan A, Nair SV, Subramanian KRV. Photocatalytic Applications of Electrospun TiO2 Nanofibres Embedded with Bimodal Sized and Prismatic Gold Nanoparticles. J Nanosci Nanotechnol 2015; 15:7153-7159. [PMID: 26716301 DOI: 10.1166/jnn.2015.10531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this paper, we have synthesized electrospun TiO2 nanofibers embedded with bimodal sized and prismatic gold nanoparticles. The surface plasmons generated in the gold nanoparticles were used to enhance the performance of photocatalysis. The photocatalytic conversion efficiencies of these bimodal sized/prismatic gold nanoparticles when embedded in electrospun TiO2 fibres showed an enhancement of upto 60% over bare fiber systems and also show higher efficiencies than electrospun fibrous systems embedded with unimodal sized gold nanoparticles. Anisotropic bimodal gold nanoparticles show the highest degree of photocatalytic activity. This may be attributed to greater density/concentration of nanoparticles with higher effective surface area and formation of a junction between the smaller and larger nanoparticles. Such a bimodally distributed range of nanoparticles could also lead to greater trapping of charge carriers at the TiO2 conduction band edge and promoting catalytic reactions on account of these trapped charges. This enhanced photocatalytic activity is explained by invoking different operating mechanisms such as improved surface area, greater trapping, coarse plasmon resonance and band effects. Thus, a useful applicability of the gold nanoparticles is shown in the area of photocatalysis.
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Sivakumar N, Srividya J, Mohana J, Anbalagan G. Growth, crystalline perfection, spectral and optical characterization of a novel optical material: l-tryptophan p-nitrophenol trisolvate single crystal. Spectrochim Acta A Mol Biomol Spectrosc 2015; 139:156-164. [PMID: 25556340 DOI: 10.1016/j.saa.2014.12.044] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [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: 10/11/2014] [Revised: 12/02/2014] [Accepted: 12/15/2014] [Indexed: 06/04/2023]
Abstract
l-tryptophan p-nitrophenol trisolvate (LTPN), an organic nonlinear optical material was synthesized using ethanol-water mixed solvent and the crystals were grown by a slow solvent evaporation method. The crystal structure and morphology were studied by single crystal X-ray diffraction analysis. The crystalline perfection of the LTPN crystal was analyzed by high-resolution X-ray diffraction study. The molecular structure of the crystal was confirmed by observing the various characteristic functional groups of the material using vibrational spectroscopy. The cut-off wavelength, optical transmission, refractive index and band gap energy were determined using UV-visible data. The variation of refractive index with wavelength shows the normal behavior. The second harmonic generation of the crystal was confirmed and the efficiency was measured using Kurtz Perry powder method. Single and multiple shot methods were employed to measure surface laser damage of the crystal. The photoluminescence spectral study revealed that the emission may be associated with the radiative recombination of trapped electrons and holes. Microhardness measurements revealed that LTPN belongs to a soft material category.
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Affiliation(s)
- N Sivakumar
- Department of Physics, Presidency College, Chennai 600 005, India
| | - J Srividya
- Department of Physics, Queen Marys College, Chennai 600 004, India
| | - J Mohana
- Department of Physics, Presidency College, Chennai 600 005, India
| | - G Anbalagan
- Department of Physics, Presidency College, Chennai 600 005, India.
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Dhayanithi NB, Kumar TTA, Kalaiselvam M, Balasubramanian T, Sivakumar N. Anti-dermatophytic activity of marine sponge, Sigmadocia carnosa (Dendy) on clinically isolated fungi. Asian Pac J Trop Biomed 2015; 2:635-9. [PMID: 23569985 DOI: 10.1016/s2221-1691(12)60111-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [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: 12/15/2011] [Revised: 01/23/2012] [Accepted: 03/12/2012] [Indexed: 11/16/2022] Open
Abstract
OBJECTIVE To screen the anti-fungal effects and find out the active metabolites from sponge, Sigmadocia carnosa (S. carnosa) against four dermatophytic fungi. METHODS The methanol, ethyl acetate and acetone extract of marine sponge, S. carnosa was examined against Trichophyton mentagrophytes (T. mentagrophytes), Trichophyton rubrum (T. rubrum), Epidermophyton floccosum (E. floccosum) and Microsporum gypseum (M. gypseum) and qualitative analysed to find out the active molecules. RESULTS The methanol extract of sponge was expressed significant activity than ethyl acetate and acetone. The minimum inhibitory concentration (MIC) of methanol extract of sponge that resulted in complete growth inhibition of T. mentagrophytes, T. rubrum, E. floccosum and M. gypseum were found to 125, 250, 250 and 250 µg/mL respectively. But, 100 % inhibition of fungal spore germination was observed in T. mentagrophytes at 500 µg/mL concentration followed by T. rubrum, E. floccosum and M. gypseum at 1 000 µg/mL concentration. Other two extracts showed weak anti spore germination activity against the tested dermatophytic fungi. Methanol extracts showed presence of terpenoids, steroids, alkaloids, saponins and glycosides. CONCLUSION Based on the literature, this is the first study which has conducted to inhibit the growth and spore germination of dermatophytic fungi with S. carnosa. Further research also needs to purify and characterize the secondary metabolites from the sponge, S. carnosa for the valuable source of novel substances for future drug discovery.
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Affiliation(s)
- N B Dhayanithi
- Centre of Advanced Study in Marine Biology, Faculty of Marine Sciences, Annamalai University, Parangipettai - 608 502, Tamil Nadu, India
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Ravi SP, Praveen P, Sreelakshmi KV, Balakrishnan A, Subramanian KRV, Shantikumar V, Lee YS, Sivakumar N. Electrochemical Performance of Electrophoretically Deposited Nanostructured LiMnPO4-Sucrose Derived Carbon Composite Electrodes for Lithium Ion Batteries. J Nanosci Nanotechnol 2015; 15:747-751. [PMID: 26328437 DOI: 10.1166/jnn.2015.9174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The present study reports an approach by which thin films of sucrose added olivine type LiMnPO4-Ccomposite and pristine LiMnPO4 is made by a technique of electrophoretic co-deposition in which pristine and composite samples were synthesized by a sol-gel route. These thin films with enhanced surface area is used to fabricate cathodes for rechargeable Li ion batteries. XRD confirms phase pure single crystalline orthorhombic structure. Transmission Electron Microscopy (TEM) images shows the carbon coating over LiMnPO4 and the particle size restricted in the nano regime. The presence of sp2 hybridized carbon on LiMnPO4 particles is confirmed by X-ray Photon spectroscopy (XPS). To explore the electrochemical behavior, cyclic voltammetry (CV) and cycling studies were performed. The specific capacity for LiMnPO4-C is found to be increased by 43% in comparison to the pristine LiMnPO4. It also exhibited 86% retention in capacity compared to the pristine LiMnPO4 (52%). The result indicates that a proper carbon coating can significantly improve the electronic conductivity and hence the specific capacity.
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Soumya MS, Binitha G, Praveen P, Subramanian KRV, Lee YS, Nair VS, Sivakumar N. Electrochemical Performance of PbO2 and PbO2-CNT Composite Electrodes for Energy Storage Devices. J Nanosci Nanotechnol 2015; 15:703-708. [PMID: 26328430 DOI: 10.1166/jnn.2015.9172] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this work we report the electrochemical performance comparison of two new hybrid supercapacitors one based on graphene as negative electrode and lead dioxide thin film as positive electrode and the other with graphene as negative electrode and lead dioxide-carbon nanotube composite as positive electrode in 0.1 M KOH electrolyte. In the present work, PbO2 was synthesized using sol-gel method which is one of the promising materials for hybrid supercapacitors. The XRD confirmed the single phase of the PbO2 and the grain size is 39 nm which has been determined using Scherrer's formula. Thin films of PbO2, PbO2-CNT composite and graphene were coated on the titanium substrate by electrophoretic deposition. Further material characterisation has been carried out using SEM, TEM, XPS and electrochemical characterisation using CV, charge/discharge and electrochemical impedance spectroscopy (EIS) for obtaining energy density and power density, cyclic stability and internal resistance respectively. The present results revealed that PbO2-CNT composite/graphene asymmetric hybrid supercapacitor exhibits large specific capacitance and energy density over PbO2/graphene based system. The PbO2-CNT composite/graphene asymmetric hybrid supercapacitor exhibited maximum power density and energy density of 1200 W/Kg and 65 Wh/Kg respectively at a current density of 2 A/g. The PbO2-CNT composite/graphene asymmetric hybrid system exhibited excellent cycling stability with the capacitance retained 85% of its maximum value up to 3000 cycles.
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Sivakumar N, Muralidharan S, Chakkaravarthi G, Velmurugan D, Anbalagan G. Crystal structure of bis[4-(dimethylamino)pyridinium] bis(2-nitrobenzoate) trihydrate. Acta Crystallogr Sect E Struct Rep Online 2014; 70:221-3. [PMID: 25484657 PMCID: PMC4257197 DOI: 10.1107/s1600536814020583] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Accepted: 09/14/2014] [Indexed: 11/10/2022]
Abstract
The title salt, 2C7H11N2+·2C7H4NO4−·3H2O, crystallized with two anions and two cations in the asymmetric unit, together with three water molecules. Both 4-dimethylaminopyridinium cations are protonated at their pyridine N atoms with the plane of the N(CH3)2hetero atoms inclined to the pyridine ring by 4.5 (2) and 1.4 (2)°. In the 2-nitrobenzoate anions, the carboxyl and nitro groups are inclined to their respective benzene rings by 77.1 (3) and 20.0 (3)°, and 75.8 (2) and 20.9 (3)°. In the crystal, the anions are linkedviaO—H...O hydrogen bonds involving the water molecules, forming chains along [100]. The cations are linked to these chains by N—H...O hydrogen bonds. The chains are linkedviaC—H...O hydrogen bonds and C—H...π and π–π interactions [inter-centroid distances range from 3.617 (1) to 3.851 (1) Å], forming a three-dimensional structure.
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Hall GE, Loo RO, Harri HP, Sivakumar N, Chawla GK, Houston PL, Chandler DW, Hepburn JW, Burak I. Vector Correlations in the Photodissociation of CH3I, OCS, and Glyoxal. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/bbpc.198800063] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Sivakumar N, Kanagathara N, Varghese B, Bhagavannarayana G, Gunasekaran S, Anbalagan G. Structure, crystal growth, optical and mechanical studies of poly bis (thiourea) silver (I) nitrate single crystal: a new semi organic NLO material. Spectrochim Acta A Mol Biomol Spectrosc 2014; 118:603-613. [PMID: 24091346 DOI: 10.1016/j.saa.2013.09.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [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: 06/06/2013] [Revised: 06/25/2013] [Accepted: 09/02/2013] [Indexed: 06/02/2023]
Abstract
A new semi organic non linear optical polymeric crystal, bis (thiourea) silver (I) nitrate (TuAgN) with dimension 8×7×1.5 mm(3) has been successfully grown from aqueous solution by slow evaporation solution technique. Single crystal X-ray diffraction study reveals that the crystal belongs to orthorhombic system with non centrosymmetric space group C2221. The crystalline perfection of the crystal was analyzed by high resolution X-ray diffraction (HRXRD) rocking curve measurements. Functional groups present in the crystal were analyzed qualitatively by infrared and Confocal Raman spectral analysis. Effects due to coordination of thiourea with metal ions were also discussed. Optical absorption study on TuAgN crystal shows the minimum absorption in the entire UV-Vis region and the lower cut off wavelength of TuAgN is found to be 318 nm. Thermal analysis shows that the material is thermally stable up to 180°C. The mechanical strength and its parameters of the grown crystal were estimated by Vicker's microhardness test. The second harmonic generation (SHG) efficiency of the crystal was measured by Kurtz's powder technique infers that the crystal has nonlinear optical (NLO) efficiency 0.85 times that of KDP.
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Affiliation(s)
- N Sivakumar
- Department of Physics, Presidency College, Chennai 600 005, India
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Praveen P, Jyothsna U, Nair P, Ravi S, Balakrishnan A, Subramanian KRV, Nair AS, Nair VS, Sivakumar N. Thin film rechargeable electrodes based on conductive blends of nanostructured olivine LiFePO4 and sucrose derived nanocarbons for lithium ion batteries. J Nanosci Nanotechnol 2013; 13:5607-5612. [PMID: 23882803 DOI: 10.1166/jnn.2013.7454] [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: 06/02/2023]
Abstract
The present study provides the first reports of a novel approach of electrophoretic co-deposition technique by which titanium foils are coated with LiFePO4-carbon nanocomposites synthesized by sol gel route and processed into high-surface area cathodes for lithium ion batteries. The study elucidates how sucrose additions as carbon source can affect the surface morphology and the redox reaction behaviors underlying these cathodes and thereby enhance the battery performance. The phase and morphological analysis were done using XRD and XPS where the LiFePO4 formed was confirmed to be a high purity orthorhombic system. From the analysis of the relevant electrochemical parameters using cyclic voltammetry and electrochemical impedance spectroscopy, a 20% increment and 90% decrement in capacity and impedance values were observed respectively. The composite electrodes also exhibited a specific capacity of 130 mA h/g. It has been shown that cathodes based on such composite systems can allow significant room for improvement in the cycling performance at the electrode/electrolyte interface.
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Affiliation(s)
- P Praveen
- Nanosolar Division, Amrita Centre for Nanosciences, Amrita Vishwa Vidyapeetham, Kochi 682041, India
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Krishnan P, Gayathri K, Sivakumar N, Gunasekaran B, Anbalagan G. Bis(2,3-dimeth-oxy-10-oxostrychni-din-ium) phthalate nonahydrate. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o870. [PMID: 23795049 PMCID: PMC3685030 DOI: 10.1107/s160053681301204x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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: 03/26/2013] [Accepted: 05/02/2013] [Indexed: 11/11/2022]
Abstract
The asymmetric unit of the title compound 2C23H27N2O4+·C8H4O42−·9H2O, contains a cation, an anionon a twofold axis and four and half molecules of water, one of which is located on the twofold axis. In the cation, both fused pyrrolidine rings exhibit twisted conformations, while the piperidine rings adopt screw–boat and boat conformations. In the crystal, the components are linked by N—H⋯O and O—H⋯O hydrogen bonds. The brucinium cations form typical undulating head-to-tail ribbon structuresalong the a-axis direction, which associate with the carboxy phthalate and the water molecules.
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Affiliation(s)
- P Krishnan
- Department of Physics, Presidency College, Chennai 600 005, India
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Krishnan P, Gayathri K, Sivakumar N, Chakkaravarthi G, Anbalagan G. 2,3-Dimeth-oxy-10-oxostrychnidinium hydrogen oxalate dihydrate. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o659. [PMID: 23723821 PMCID: PMC3647855 DOI: 10.1107/s1600536813008623] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2013] [Accepted: 03/28/2013] [Indexed: 11/10/2022]
Abstract
In the cation of the title salt, C23H27N2O4 (+)·C2HO4 (-)·2H2O, both fused pyrrolidine rings exhibit twisted conformations, while the piperidine rings adopt screw-boat and boat conformations. In the crystal, the three components are linked via O-H⋯O and N-H⋯O inter-actions, forming a tape along the b axis. The tapes are further linked by weak C-H⋯O hydrogen bonds. forming a three-dimensional network.
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Affiliation(s)
- P. Krishnan
- Department of Physics, Presidency College, Chennai 600 005, India
| | - K. Gayathri
- Department of Physics, Presidency College, Chennai 600 005, India
| | - N. Sivakumar
- Department of Physics, Presidency College, Chennai 600 005, India
| | - G. Chakkaravarthi
- Department of Physics, CPCL Polytechnic College, Chennai 600 068, India,Correspondence e-mail: ,
| | - G. Anbalagan
- Department of Physics, Presidency College, Chennai 600 005, India,Correspondence e-mail: ,
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Prathebha K, Sathya S, Usha G, Sivakumar N, Bakthadoss M. [4-(4-Meth-oxy-phen-yl)-1-methyl-3-nitro-pyrrolidin-3-yl]methanol. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o372. [PMID: 23476560 PMCID: PMC3588458 DOI: 10.1107/s1600536813003073] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Accepted: 01/30/2013] [Indexed: 06/01/2023]
Abstract
In the title compound, C13H18N2O4, the dihedral angle between the benzene and pyrrolidine (all atoms) rings is 70.6 (1)°. The pyrrolidine ring adopts a half-chair conformation. In the crystal, mol-ecules form chains along the c-axis direction linked by O-H⋯N hydrogen bonds, which are then connected by C-H⋯O inter-actions, forming a sheet parallel to the bc plane.
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Affiliation(s)
- K. Prathebha
- PG and Research Department of Physics, Queen Mary’s College, Chennai-4, Tamilnadu, India
| | - S. Sathya
- PG and Research Department of Physics, Queen Mary’s College, Chennai-4, Tamilnadu, India
| | - G. Usha
- PG and Research Department of Physics, Queen Mary’s College, Chennai-4, Tamilnadu, India
| | - N. Sivakumar
- Department of Organic Chemistry, University of Madras, Guindy Campus, Chennai-25, Tamilnadu, India
| | - M. Bakthadoss
- Department of Organic Chemistry, University of Madras, Guindy Campus, Chennai-25, Tamilnadu, India
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Kanagathara N, Renganathan NG, Marchewka MK, Sivakumar N, Gayathri K, Krishnan P, Gunasekaran S, Anbalagan G. Growth and characterization of Melaminium bis (trichloroacetate) dihydrate. Spectrochim Acta A Mol Biomol Spectrosc 2013; 101:112-118. [PMID: 23099168 DOI: 10.1016/j.saa.2012.09.057] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2012] [Revised: 08/30/2012] [Accepted: 09/20/2012] [Indexed: 06/01/2023]
Abstract
Single crystals of melaminium bis (trichloroacetate) dihydrate have been grown successfully by slow evaporation solution growth technique at room temperature. Single crystal X-ray diffraction analysis reveals that the compound crystallizes in monoclinic system with non -centrosymmetric space group C2 with lattice parameters a=17.70 Å, b=8.44 Å, c=6.09 Å, α=90°, β=100.24°, γ=90° and V=900 (Å)3. The UV-Vis transmittance spectrum shows that the crystal has a good optical transmittance in the entire visible region with lower cutoff wavelength of 351 nm. The vibrational frequencies of various functional groups present in the crystal have been derived from FI-IR, FT-Raman and Confocal Raman analyses. The chemical structure of the compound was established by 1H and 13C NMR spectrum. TGA-DTA analysis reveals that the materials have good thermal stability and the melting point of the crystal is found to be 195°C. The dielectric response of the crystals was studied in the frequency range 50 Hz to 5 MHz at different temperatures and the results are discussed. Etching studies show the growth pattern of the crystals. The second harmonic generation efficiency was measured in comparison with KDP by employing powder Kurtz method.
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Affiliation(s)
- N Kanagathara
- Department of Physics, Vel Tech Multi Tech Dr. Rangarajan Dr. Sakunthala Engg. College, Avadi, Chennai, India
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Chacko DK, Madhavan AA, Arun TA, Thomas S, Anjusree GS, Deepak TG, Balakrishnan A, Subramanian KRV, Sivakumar N, Nair SV, Nair AS. Ultrafine TiO2 nanofibers for photocatalysis. RSC Adv 2013. [DOI: 10.1039/c3ra43716g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Abstract
Agenesis of multiple primary teeth is rare. A 6-year-old girl visited our department, in the absence of any other systemic abnormalities, on clinical and radiographic evaluation, it was revealed that she had only 6 primary teeth in her mouth. Maxillary and mandibular removable partial dentures were fabricated for prosthodontic rehabilitation. At the 6 months follow-up nutrition of the patient as well as self-confident appearance was improved. How to cite this article: Nirmala SVSG, Gokhale N, Sivakumar N, Quadar MA. Agenesis of Multiple Primary Teeth and Its Rehabilitation: A Case Report. Int J Clin Pediatr Dent 2013; 6(1):55-57.
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Affiliation(s)
- Svsg Nirmala
- Professor, Department of Pedodontics and Preventive Dentistry Narayana Dental College, Nellore, Andhra Pradesh-524002, India
| | - Niraj Gokhale
- Senior Lecturer, Department of Pedodontics and Preventive Dentistry Maratha Mandal Institute of Dental Sciences, Belgaum, Karnataka India
| | - N Sivakumar
- Professor and Head, Professor and Head, Department of Pedodontics and Preventive Dentistry, Narayana Dental College, Nellore, Andhra Pradesh, India
| | - Md Akhil Quadar
- Postgraduate Student, Department of Pedodontics and Preventive Dentistry, Narayana Dental College, Nellore, Andhra Pradesh, India
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Anjusree GS, Bhupathi A, Balakrishnan A, Vadukumpully S, Subramanian KRV, Sivakumar N, Ramakrishna S, Nair SV, Nair AS. Fabricating fiber, rice and leaf-shaped TiO2 by tuning the chemistry between TiO2 and the polymer during electrospinning. RSC Adv 2013. [DOI: 10.1039/c3ra42250j] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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46
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Ranjusha R, Ramakrishna S, Nair AS, Anjali P, Vineeth S, Sonia TS, Sivakumar N, Subramanian KRV, Nair SV, Balakrishnan A. Fabrication and performance evaluation of button cell supercapacitors based on MnO2 nanowire/carbon nanobead electrodes. RSC Adv 2013. [DOI: 10.1039/c3ra41992d] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Sundaramoorthy S, Sivakumar N, Bakthadoss M, Velmurugan D. 1-Methyl-3-(2-methyl-phen-yl)-3a-nitro-1,2,3,3a,4,9b-hexa-hydro-chromeno[4,3-b]pyrrole. Acta Crystallogr Sect E Struct Rep Online 2012; 68:o1735. [PMID: 22719522 PMCID: PMC3379324 DOI: 10.1107/s1600536812020338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2012] [Accepted: 05/06/2012] [Indexed: 11/11/2022]
Abstract
The asymmetric unit of the title compound, C(19)H(20)N(2)O(3), contains two independent mol-ecules in both of which the pyrrolidine ring adopts an envelope conformation, but with a C atom as the flap in one mol-ecule and the N atom in the other. The pyran ring adopts a half-chair conformation in both mol-ecules. In the crystal, mol-ecules are linked via C-H⋯O hydrogen bonds and C-H⋯π inter-actions.
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Nirmala SVSG, Sandeep C, Sivakumar N, Babu MS, Lalitha V. Agenesis of premolar associated with submerged primary molar and a supernumerary premolar: An unusual case report. Contemp Clin Dent 2012; 3:S99-S102. [PMID: 22629079 PMCID: PMC3354794 DOI: 10.4103/0976-237x.95116] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
The combination of submerged primary molar, agenesis of permanent successor with a supernumerary in the same place is very rare. The purpose of this article is to report a case of submerged mandibular left second primary molar with supernumerary tooth in the same region along with agenesis of second premolar in an 11-year-old girl, its possible etiological factors, and a brief discussion on treatment options.
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Affiliation(s)
- S V S G Nirmala
- Department of Pedodontics and Preventive Dentistry, Narayana Dental College, Nellore, Andhra Pradesh, India
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49
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Sriram CH, Priya VK, Sivakumar N, Reddy KRM, Babu PJ, Reddy P. Occlusion of primary dentition in preschool children of Chennai and Hyderabad: A comparative study. Contemp Clin Dent 2012; 3:31-7. [PMID: 22557894 PMCID: PMC3341756 DOI: 10.4103/0976-237x.94543] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [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] [Indexed: 11/05/2022] Open
Abstract
Objective: To provide information on the state of occlusion and the spaces available after complete eruption of the primary dentition and to compare the characteristic features of the primary dentition in Chennai and Hyderabad, two of the metropolitan cities in South India. Materials and Methods: Children in the age range between 3 and 5 years were selected from different schools of both Chennai and Hyderabad, with a complete set of primary dentition. Study casts were obtained and assessment of spacing in the primary dentition and the primary molar relationship were recorded in centric occlusion. The data obtained was subjected to statistical analysis. Results: The mean values and standard deviations for the primary molar relationship and spacing in primary dentition are given in the tables. Conclusion: Bilateral flush terminal plane relationship of the second primary molars and spaced dentition was most frequent in primary dentition of the children in both Chennai and Hyderabad groups. Significant differences were not found among both groups and genders.
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Affiliation(s)
- C H Sriram
- Dept. of Pedodontics, MNR Dental College, Sangareddy, Andhra Pradesh, India
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50
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Sathya S, Bhaskaran S, Usha G, Sivakumar N, Bakthadoss M. 2'-Hy-droxy-methyl-1'-(4-methyl-phen-yl)-2'-nitro-1',2',5',6',7',7a'-hexa-hydro-spiro-[indoline-3,3'-pyrrolizin]-2-one. Acta Crystallogr Sect E Struct Rep Online 2012; 68:o277. [PMID: 22346919 PMCID: PMC3274974 DOI: 10.1107/s1600536811055449] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2011] [Accepted: 12/23/2011] [Indexed: 05/31/2023]
Abstract
In the title compound, C(22)H(23)N(3)O(4), the tolyl ring is almost perpendicular [83.86 (7)°] to the best plane through the eight atoms of the pyrrolizidine ring system. The mol-ecular conformation is stabilized by an intra-molecular O-H⋯O hydrogen bond. The crystal packing features inversion dimers with R(2) (2)(8) motifs linked by pairs of N-H⋯O hydrogen bonds.
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Affiliation(s)
- S. Sathya
- Department of Physics, Queen Mary’s College, Chennai-4, Tamilnadu, India
| | - Sundari Bhaskaran
- Department of Physics, Queen Mary’s College, Chennai-4, Tamilnadu, India
| | - G. Usha
- Department of Physics, Queen Mary’s College, Chennai-4, Tamilnadu, India
| | - N. Sivakumar
- Department of Organic Chemistry, University of Madras, Guindy Campus, Chennai-25, Tamilnadu, India
| | - M. Bakthadoss
- Department of Organic Chemistry, University of Madras, Guindy Campus, Chennai-25, Tamilnadu, India
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