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Janardhanan S, Mielcarek S, Głowiński H, Kowacz M, Kuświk P, Krawczyk M, Trzaskowska A. Investigation of spin wave dynamics in Au/CoFeB/Au multilayers with perpendicular magnetic anisotropy. Sci Rep 2023; 13:22494. [PMID: 38110449 PMCID: PMC10728143 DOI: 10.1038/s41598-023-49859-8] [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: 09/01/2023] [Accepted: 12/12/2023] [Indexed: 12/20/2023] Open
Abstract
We have carried out an experimental investigation of the spin-wave dynamics in the Au/CoFeB/Au multilayer consisting of a ferromagnetic film with thicknesses of 0.8, 0.9 and 1.0 nm. We employed the Brillouin light scattering spectroscopy to measure the frequency of the spin waves in dependence on the wave vector. Additionally, we characterized the samples by ferromagnetic resonance measurements. We found that the considered samples exhibit perpendicular magnetic anisotropy with low damping, indicating small pumping effects. Furthermore, we found a nonreciprocal dispersion relation pointing at a non-negligible Dzyaloshinskii-Moriya interaction. These results make the Au/CoFeB/Au multilayer a compelling subject for further analysis and as a potential material for future applications within magnonics.
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Affiliation(s)
- S Janardhanan
- ISQI, Faculty of Physics, Adam Mickiewicz University, Poznan, Poland.
| | - S Mielcarek
- ISQI, Faculty of Physics, Adam Mickiewicz University, Poznan, Poland
| | - H Głowiński
- Institute of Molecular Physics, Polish Academy of Science, Poznan, Poland
| | - M Kowacz
- Institute of Molecular Physics, Polish Academy of Science, Poznan, Poland
| | - P Kuświk
- Institute of Molecular Physics, Polish Academy of Science, Poznan, Poland
| | - M Krawczyk
- ISQI, Faculty of Physics, Adam Mickiewicz University, Poznan, Poland
| | - A Trzaskowska
- ISQI, Faculty of Physics, Adam Mickiewicz University, Poznan, Poland
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Janardhanan S, Mahendra J, Mahendra L, Devarajan N. Cytotoxic Effects of Mangosteen Pericarp Extracts on Oral Cancer and Cervical Cancer Cells. Asian Pac J Cancer Prev 2020; 21:2577-2583. [PMID: 32986355 PMCID: PMC7779451 DOI: 10.31557/apjcp.2020.21.9.2577] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Indexed: 11/25/2022] Open
Abstract
Background: Despite immense advancements in treatment modalities, cancer remains a dreadful disease until the present. The major influencing factors behind the increased mortality rate of cancer are increased drug resistance and severe adverse effects caused by conventional cancer therapies. To overcome these limitations, the current medical field is focusing more on natural phyto-derived molecules to mitigate cancer. Mangosteen is a phytotherapeutic with potent anti-inflammatory and antioxidant properties. In the present study, we investigated the anticancer potential of the crude ethanolic extract of mangosteen against two dreadful forms of cancers, namely, oral cancer and cervical cancer, in vitro. Methodology: The pericarp of Garcinia mangostana or mangosteen was removed, air-dried, ground to fine powder, and macerated with ethanol. The extract obtained was then filtered and extracted with water for 48 h. The aqueous fraction thus obtained was then concentrated with a rotary evaporator at 40°C and dried with a freeze dryer. The anticancer efficacy of these extracts was investigated in human tongue squamous cell carcinoma (H357) cells and cervical cancer cells (HeLa) using the MTT assay, TUNEL assay, western blotting, and flow cytometry techniques. Results: The crude mangosteen pericarp extract (MPE) significantly inhibited the growth of H357 and HeLa cells in a dose-dependent manner. Moreover, mangosteen induced early apoptosis in these cells after 48 h of incubation. Mangosteen also upregulated the expression of pro-apoptotic proteins, including caspases and Bax, and downregulated the expression of anti-apoptotic protein Bcl-2. Conclusion: The MPE exerted significant cytotoxicity against the H357 and HeLa cells in a dose-dependent manner and promoted their apoptosis. Hence, this natural phytoextract can be considered a potent anticancer agent for treating oral cancer and cervical cancer.
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Affiliation(s)
- Sunitha Janardhanan
- Meenakshi Academy of Higher Education and Research, Meenakshi Ammal Dental College and Hospital, Chennai, India
| | - Jaideep Mahendra
- Faculty of Dentistry, Meenakshi Academy of Higher Education and Research Meenakshi Ammal Dental College and Hospital Chennai Chennai, India
| | - Little Mahendra
- Maktoum Bin Hamdan Dental University College, Dubai, United Arab Emirates
| | - Nalini Devarajan
- Meenakshi Academy of Higher Education and Research, Meenakshi Ammal Dental College and Hospital, Chennai, India
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Ramamoorthy A, Ravi S, Jeddy N, Thangavelu R, Janardhanan S. Natural Alternatives for Chemicals Used in Histopathology Lab- A Literature Review. J Clin Diagn Res 2017; 10:EE01-EE04. [PMID: 28050388 DOI: 10.7860/jcdr/2016/23420.8860] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [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: 08/09/2016] [Accepted: 10/04/2016] [Indexed: 11/24/2022]
Abstract
Histopathology lab is the place where the specimen gets processed and stained to view under microscope for interpretation. Exposure to the chemicals used in these processes cause various health hazards to the laboratory technicians, pathologists, and scientists working in the laboratory. Hence, there is a dire need to introduce healthy and bio-friendly alternatives in the field. This literature review explores the natural products and their efficiency to be used as alternatives for chemicals in the histopathology lab.
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Affiliation(s)
- Ananthalakshmi Ramamoorthy
- Reader, Department of Oral Pathology and Microbiology, Thai Moogambigai Dental College and Hospital , Chennai, Tamil Nadu, India
| | - Shivani Ravi
- Postgraduate, Department of Oral Pathology and Microbiology, Thai Moogambigai Dental College and Hospital , Chennai, Tamil Nadu, India
| | - Nadeem Jeddy
- Professor and Head, Department of Oral Pathology and Microbiology, Thai Moogambigai Dental College and Hospital , Chennai, Tamil Nadu, India
| | - Radhika Thangavelu
- Reader, Department of Oral Pathology and Microbiology, Thai Moogambigai Dental College and Hospital , Chennai, Tamil Nadu, India
| | - Sunitha Janardhanan
- Reader, Department of Oral Pathology and Microbiology, Thai Moogambigai Dental College and Hospital , Chennai, Tamil Nadu, India
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Janardhanan S, Mahendra J, Girija ASS, Mahendra L, Priyadharsini V. Antimicrobial Effects of Garcinia Mangostana on Cariogenic Microorganisms. J Clin Diagn Res 2017; 11:ZC19-ZC22. [PMID: 28274037 DOI: 10.7860/jcdr/2017/22143.9160] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [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: 06/17/2016] [Accepted: 10/17/2016] [Indexed: 11/24/2022]
Abstract
INTRODUCTION Garcinia mangostana commonly called as Mangosteen fruit has been used as an antibacterial agent since age old times. The mangosteen pericarp has proven to have antibacterial effect, but the effect of the same on cariogenic organisms has not been explored. The present study was an attempt to gain a better understanding of the antibacterial effect of mangosteen pericarp on the cariogenic bacteria, to unravel the therapeutic potential for the same. AIM The aim of the study was to assess the antibacterial efficacy of the crude chloroform extract of mangosteen pericarp against cariogenic bacteria. MATERIALS AND METHODS The study was done under laboratory settings using an in vitro design. The microorganisms namely Streptococcus mutans, Streptococcus sanguis, Streptococcus salivarius, Streptococcus oralis and Lactobacillus acidophilus were procured from American Type Cell Culture (ATCC) and Microbial Type Culture Collection (MTCC) were revived and lawn cultured. The antibacterial effect of mangosteen pericarp was tested using agar well diffusion method on Trypticase Soy Agar-Blood Agar (TSA-BA) and de Man, Rogosa and Sharpe (MRS) agar media. The standard antiplaque agent chlorhexidine was used as the positive control. This cross-sectional, experimental study was done in Central Research laboratory, Meenakshi Ammal Dental College for period of eight weeks. Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) values were determined by microbroth dilution method. Statistical analysis was done by calculating the mean of the zones of inhibition on tested microorganisms. Mann-Whitney test was done to compare the zones of inhibition of mangosteen and chlorhexidine. RESULTS The antibacterial bioassay showed the highest activity for Lactobacillus acidophilus (13.6 mm) and Streptococcus sanguis (13.6 mm), whereas, it showed a medium and low activity for Streptococcus oralis (11.3 mm), Streptococcus mutans (10.6 mm) and Streptococcus salivarius (3 mm) respectively. The MBC and MIC values were lowest for Lactobacillus acidophilus (MIC 25 mg/ml, MBC 50 mg/ml) and Streptococcus oralis (MIC 50 mg/ml, MBC 100 mg/ml). CONCLUSION Mangosteen pericarp extract had a higher zone of inhibition against the tested microorganisms which suggests its potent antibacterial action against cariogenic organisms. However, further analytical studies are needed to isolate the key molecules of mangosteen pericarp, to explore its anticariogenic therapeutic potential on gram negative oral microorganisms.
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Affiliation(s)
- Sunitha Janardhanan
- Research Scholar, Meenakshi Academy of Higher Education and Research , Chennai, Tamil Nadu, India
| | - Jaideep Mahendra
- Professor, Department of Periodontology, Meenakshi Ammal Dental College , Chennai, Tamil Nadu, India
| | - A S Smiline Girija
- Reader, Department of Microbiology, Meenakshi Ammal Dental College , Chennai, Tamil Nadu, India
| | - Little Mahendra
- Associate Professor, Department of Periodontology, Rajamuthaiah Dental College , Chennai, Tamil Nadu, India
| | - Vijayashree Priyadharsini
- Scientist III, Central Research Laboratory, Meenakshi Academy of Higher Education and Research , Chennai, Tamil Nadu, India
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Ramani P, Krithika C, Ananthalakshmi R, Singaram M, Jagdish P, Janardhanan S, Jeevakarunyam S. Verrucoid Variant of Invasive Squamous Cell Carcinoma in Oral Submucous Fibrosis: A Clinicopathological Challenge. Cureus 2016; 8:e862. [PMID: 28361010 PMCID: PMC5362275 DOI: 10.7759/cureus.862] [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] [Indexed: 11/05/2022] Open
Abstract
Verrucous carcinoma (VC) is an exophytic, low-grade, well-differentiated variant of squamous cell carcinoma. It is described as a lesion appearing in the sixth or seventh decade of life that has minimal aggressive potential and, in long-standing cases, has been shown to transform into squamous cell carcinoma. Oral submucous fibrosis (OSMF) is a potentially malignant disorder, and about one-third of the affected population develop oral squamous cell carcinoma. The histopathological diagnosis of verrucous carcinoma is challenging, and the interpretation of early squamous cell carcinoma requires immense experience. Here we present a rare case of a 24-year-old male with OSMF transforming to verrucous carcinoma with invasive squamous cell carcinoma. Even though the case had a straightforward clinical diagnosis, the serial sectioning done for pathological diagnosis disclosed the squamous cell carcinoma.
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Affiliation(s)
- Priya Ramani
- Department of Oral Medicine and Radiology, Thai Moogambigai Dental College and Hospital
| | - C Krithika
- Department of Oral Medicine and Radiology, Thai Moogambigai Dental College and Hospital
| | - R Ananthalakshmi
- Department of Oral Pathology, Thai Moogambigai Dental College and Hospital
| | - Mamta Singaram
- Department of Oral Medicine and Radiology, Thai Moogambigai Dental College and Hospital
| | - Praveena Jagdish
- Department of Oral Medicine and Radiology, Thai Moogambigai Dental College and Hospital
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Ramamoorthy A, Jeevakarunyam SJ, Janardhanan S, Jeddy N, Vasan SA, Raja A, Ikram P. Survey on utility of yoga as an alternative therapy for occupational hazards among dental practioners. J Nat Sci Biol Med 2015; 6:149-52. [PMID: 25810653 PMCID: PMC4367027 DOI: 10.4103/0976-9668.149114] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [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: 11/04/2022] Open
Abstract
BACKGROUND The therapeutic potential of yoga are often considered complementary to various forms of medical practice. Very few studies have evaluated the effects of yoga in the treatment of occupational hazards among dentists. Hence, this cross-sectional study was designed to evaluate the adoption of yoga techinques as an alternative therapy in treatment of physical and psychological occupational hazards among dental general practitioners in Chennai, India. MATERIALS AND METHODS A validated closed-ended questionnaire was circulated to 500 dental general practitioners in Chennai, India and we received 394 completed questionnaires. The questionnaire documented demographic data, occupational hazards and the type of treatment taken for the hazards. RESULTS Musculoskeletal pain with stress (47%) was the most common occupational hazard reported, followed by only stress (27.4%), and only musculoskeletal pain (25.6%). Only 9.6% of practitioners adopted yoga as an alternative treatment for these occupational hazards. Interestingly, majority (46.4%) of them did exercise, gym, massage, walking and heard music. Surprisingly, 43.9% did not take any measures to treat these occupational hazards. However 53.3% of the dentists who did not consider yoga as an alternative therapy, stated lack of time as a reason for not practicing yoga while 17.6% of them don't believe yoga as a therapy. CONCLUSION Despite musculoskeletal pain and stress being the most common occupational hazard prevalent among dentists, over 50% of the subjects surveyed didn't seek any measure to treat these occupational hazards and only 10% of them practiced yoga as the alternative therapy.
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Affiliation(s)
| | | | - Sunitha Janardhanan
- Department of Oral Pathology, Thai Moogambigai Dental College and Hospital, Chennai, Tamil Nadu, India
| | - Nadeem Jeddy
- Department of Oral Pathology, Thai Moogambigai Dental College and Hospital, Chennai, Tamil Nadu, India
| | - Srikaanth Aranmanai Vasan
- Department of Oral Pathology, Thai Moogambigai Dental College and Hospital, Chennai, Tamil Nadu, India
| | - Arundayanadhi Raja
- Department of Oral Pathology, Thai Moogambigai Dental College and Hospital, Chennai, Tamil Nadu, India
| | - Parvez Ikram
- Department of Oral Pathology, Thai Moogambigai Dental College and Hospital, Chennai, Tamil Nadu, India
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Ramamoorthy A, Janardhanan S, Jeevakarunyam S, Jeddy N, Eagappan S. Integrative oncology in Indian subcontinent: an overview. J Clin Diagn Res 2015; 9:XE01-XE03. [PMID: 25954692 DOI: 10.7860/jcdr/2015/12185.5714] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [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: 11/19/2014] [Accepted: 02/10/2015] [Indexed: 01/23/2023]
Abstract
Integrative oncology is a combination of one where complementary and alternative medicine (CAM) with conventional cancer treatment modalities is used to manage symptoms, control side-effects and improve the state of mental wellbeing. The ancient Indian medicinal approach in cancer treatment and management has a wide array of herbs and practices. There is an increasing demand for traditional and natural medicine by the cancer patients. The conventional oncologic surgeons and physicians should be aware of the role of cCAM that are available in Indian subcontinent and provide a treatment that focuses on the physical and mental state of wellness in combating cancer.
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Affiliation(s)
- Ananthalakshmi Ramamoorthy
- Reader, Department of Oral Pathology and Microbiology, Thai Moogambigai Dental College and Hospital , Chennai, India
| | - Sunitha Janardhanan
- Senior Lecturer, Department of Oral Pathology and Microbiology, Thai Moogambigai Dental College and Hospital , Chennai, India
| | - Sathiyajeeva Jeevakarunyam
- Senior Lecturer, Department of Oral Pathology and Microbiology, Thai Moogambigai Dental College and Hospital , Chennai, India
| | - Nadheem Jeddy
- Professor, Department of Oral Pathology and Microbiology, Thai Moogambigai Dental College and Hospital , Chennai, India
| | - Senthil Eagappan
- Lecturer, Department of Pedodontics and Preventive Dentistry, Chettinad Dental College and Research Institute , Chennai, India
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Sreekumar TK, Janardhanan S, Kalidas C. Ion-Solvent Interactions of Silver (I) Salts in Water-DMSO Mixtures from Conductance Measurements. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19910950102] [Citation(s) in RCA: 4] [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: 11/08/2022]
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Alvin Jose M, Ibrahim, Janardhanan S. Modulatory effect ofPlectranthus amboinicusLour. on ethylene glycol-induced nephrolithiasis in rats. Indian J Pharmacol 2005. [DOI: 10.4103/0253-7613.13857] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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