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Yadav BS, Dahiya D, Kannan P, Goyal S, Laroiya I, Irrinki S, Singh NR, Sharma R. HYPofractionated Adjuvant RadioTherapy in 1 versus 2 weeks in high-risk patients with breast cancer (HYPART): a non-inferiority, open-label, phase III randomised trial. Trials 2024; 25:21. [PMID: 38167339 PMCID: PMC10763219 DOI: 10.1186/s13063-023-07851-7] [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: 05/26/2023] [Accepted: 12/06/2023] [Indexed: 01/05/2024] Open
Abstract
BACKGROUND Breast cancer is the most common cancer in women. Radiotherapy is an important part of breast cancer treatment after surgery. Breast cancer radiotherapy is usually delivered in 3-5 weeks. This is a long duration for women with breast cancer to stay away from the family and work. We wanted to reduce this duration so that the wages loss and the logistics can be minimised for these patients. Hypofractionation, i.e. high dose per fraction, is delivered in a smaller number of days. In this study, we will compare a 1-week schedule of hypofractionated adjuvant whole breast/chest wall and/or regional nodal radiotherapy against 2 weeks for locoregional disease control, toxicities, quality of life (QoL), survival and second cancers after primary surgery in patients with breast cancer. METHODS Eligible patients with breast cancer after mastectomy or breast conserving surgery (BCS) will be treated with a radiotherapy dose of 26 Gy in 5 fractions over 1 week in the study arm and 34 Gy in 10 fractions over 2 weeks in the control arm. The primary endpoint of this noninferiority study will be locoregional tumour control. Secondary endpoints will be early and late radiation toxicities, quality of life, contralateral primary tumours, regional and distant metastases, survival and second cancers. A total of 1018 patients will be randomised (1:1) to receive 1 week or 2 weeks of radiotherapy. An event-driven analysis will be performed after at least 94 patients have documented locoregional recurrences. Acute radiation toxicity will be assessed and scaled according to the RTOG grading system. Late radiation toxicity will be assessed with the Radiation Therapy Oncology Group and the European Organisation for Research and Treatment of Cancer late radiation morbidity scale. Cosmetic assessment will be done using Harvard/NSABP/RTOG breast cosmesis grading scale at baseline and 3 and 5 years. QoL will be assessed with EORTC QLQ-30 and EORTC QLQ-BR 23 at baseline and 3 and 5 years. DISCUSSION Hypofractionation reduces treatment time to half while maintaining breast cosmesis and gives control rates equal to conventional fractionation. This is possible because breast tissue can tolerate high dose per fraction. In this study, we presume that 1-week radiotherapy will be non-inferior to 2 week radiotherapy, i.e. disease control will be similar with both the schedules without additional side effects, and QoL of these patients will be maintained. If we are able to achieve these outcomes, then patients will be able to complete their radiotherapy in less duration. There is not much data on regional nodal irradiation with hypofraction in breast cancer. We have used hypofraction for regional nodal irradiation in the past and not encountered any safety issue. If we are able to prove that late-term effects are comparable in the two schedules, it will make the radiation oncologist confident about hypofractionation in breast cancer. As breast cancer is a leading cancer in females and radiation therapy is an integral part of its local management, hypofractionation will help radiation centres worldwide to meet the growing need for radiation treatment in breast cancer, particularly in developing countries where resources are limited. It will also reduce the financial burden on the patient and family. Since we will treat these patients with both simple and complex radiotherapy techniques, it will also be possible for the low-income countries to follow this trial without needing a high-end or expensive radiotherapy equipment as the planning and treatment process will be very simple. TRIAL REGISTRATION The trial is registered with ClinicalTrials.gov ID NCT04472845 and CTRI with REF/2020/09/037050.
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Affiliation(s)
- Budhi Singh Yadav
- Department of Radiotherapy & Oncology, Post Graduate Institute of Medical Education & Research, Chandigarh, India.
| | - Divya Dahiya
- Department of General Surgery, Post Graduate Institute of Medical Education & Research, Chandigarh, India
| | - P Kannan
- Department of Radiotherapy & Oncology, Post Graduate Institute of Medical Education & Research, Chandigarh, India
| | - Shikha Goyal
- Department of Radiotherapy & Oncology, Post Graduate Institute of Medical Education & Research, Chandigarh, India
| | - Ishita Laroiya
- Department of General Surgery, Post Graduate Institute of Medical Education & Research, Chandigarh, India
| | - Santhosh Irrinki
- Department of General Surgery, Post Graduate Institute of Medical Education & Research, Chandigarh, India
| | - Ngangom Robert Singh
- Department of Radiotherapy & Oncology, Post Graduate Institute of Medical Education & Research, Chandigarh, India
| | - Reena Sharma
- Department of Radiotherapy & Oncology, Post Graduate Institute of Medical Education & Research, Chandigarh, India
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Yap LB, Choy CN, Koh KW, Kannan P, Jeyamalar R, Navin S, Balachandran K. Left main stem stenosis angioplasty with intravascular ultrasound optimisation criteria guidance using a new generation everolimus drug-eluting stent. Med J Malaysia 2023; 78:139-144. [PMID: 36988521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
Abstract
INTRODUCTION Intravascular ultrasound (IVUS) is recommended in the use of left main stem (LMS) percutaneous coronary intervention (PCI). Since the LMS diameter is usually larger than other coronary arteries, a new generation everolimus drug-eluting stent (DES), Synergy Megatron DES (Boston Scientific) has better axial and radial strength allowing more post implant overexpansion and consequently better suited for LMS lesions. We performed a study to evaluate the clinical outcomes of PCI using 1) an improved IVUS protocol with optimisation targets and 2) the use of Megatron stents. MATERIALS AND METHODS This was a study involving LMS PCI coronary lesions using the Synergy Megatron DES. An IVUS protocol using predefined optimisation targets to evaluate for stent malapposition, longitudinal stent deformation, optimal stent expansion >90% of reference lumen and appropriate distal landing zone was used in all cases. The primary end-point was procedural success, defined by successful stent implantation with <30% residual stenosis. The secondary end-point was in-hospital and 30-day major adverse cardiovascular event (MACE). RESULTS Eight patients with significant LMS stenosis were successfully treated with the Megatron stent. The primary end-point was achieved in all patients. There were no cases of stent malapposition or longitudinal stent deformation, one case did not have optimal LMS stent expansion and one case did not have an appropriate distal landing zone. IVUS optimisation criteria were met in 6 (75%) cases. There were no complications of coronary dissection, slow or no reflow, stent thrombosis or vessel perforation. None of the patients suffered in-hospital or 30-day MACE. The average LMS MLD at baseline was 2.1 ± 0.1mm and the post-PCI LMS MLD was 4.0 ± 0.5mm, with a significant acute luminal gain of 1.9 ± 0.7mm (p<0.01). A post-PCI MSA of 17 ± 3.9 mm2 was numerically superior compared to those documented in other LMS PCI trials. CONCLUSION This study demonstrates low rates of shortterm major adverse cardiovascular events among patients with LMS PCI using the Megatron stents. It highlights the usefulness of IVUS-guided optimisation in LMS PCI. With the use of intravascular imaging, the new generation stent technology can improve the treatment of large proximal vessels and PCI of LMS lesions.
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Affiliation(s)
- L B Yap
- Subang Jaya Medical Centre, Department of Cardiology, Subang Jaya, Malaysia.
| | - C N Choy
- Subang Jaya Medical Centre, Department of Cardiology, Subang Jaya, Malaysia
| | - K W Koh
- Subang Jaya Medical Centre, Department of Cardiology, Subang Jaya, Malaysia
| | - P Kannan
- Subang Jaya Medical Centre, Department of Cardiology, Subang Jaya, Malaysia
| | - R Jeyamalar
- Subang Jaya Medical Centre, Department of Cardiology, Subang Jaya, Malaysia
| | - S Navin
- Subang Jaya Medical Centre, Department of Cardiology, Subang Jaya, Malaysia
| | - K Balachandran
- Institut Jantung Negara, Department of Cardiology, Kuala Lumpur, Malaysia
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Sarojini G, Kannan P, Rajamohan N, Rajasimman M. Bio-fabrication of porous magnetic Chitosan/Fe 3O 4 nanocomposite using Azolla pinnata for removal of chromium - Parametric effects, surface characterization and kinetics. Environ Res 2023; 218:114822. [PMID: 36470349 DOI: 10.1016/j.envres.2022.114822] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 10/30/2022] [Accepted: 11/13/2022] [Indexed: 06/17/2023]
Abstract
In this research, a novel porous nanocomposite, namely Chitosan-iron-oxide @ Azolla pinnata nanocomposite, has been synthesized by co-precipitation and hydrothermal method. The effect of process parameter on adsorption process was investigated. Batch removal of chromium (Cr) was optimized with respect to solution pH, batch stirring time, sorbent dose, initial chromium concentration and temperature. The maximum removal efficiency was found to be 98.58%. The Fourier transform infrared (FTIR) spectroscopy and scanning electron microscope (SEM) analysis of the nano composite confirmed the presence of characteristic functional groups and porous structure of synthesized nanocomposite. The adsorption data fitted well with Langmuir adsorption isotherm (R2 = 0.996) confirming mono layer sorption and the maximum uptake was found to be 294.12 mg/g. The adsorption was found to follow pseudo second order model (R2 = 0.997). Thermodynamic studies revealed that adsorption is endothermic and spontaneous. Reusability studies have confirmed that removal efficiency attained was 85% after completion of five adsorption-desorption cycles. Electrostatic attraction, ion exchange, coordination bonding and reduction are the major mechanisms responsible for removal of chromium. Surface modification of Azolla pinnata with chitosan and iron oxide improved the ability of Azolla in the adsorption of chromium from aqueous media. The combined effects of facile synthesis, improved adsorption features and easier magnetic separation promotes Chitosan-iron-oxide @ Azolla pinnata nanocomposite as a novel adsorbent.
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Affiliation(s)
- G Sarojini
- Department of Chemical Engineering, Hindusthan College of Engineering and Technology, Valley Campus, Coimbatore, India.
| | - P Kannan
- Department of Chemistry, V.S.B College of Engineering Technical Campus, Coimbatore, India
| | - Natarajan Rajamohan
- Chemical Engineering Section, Faculty of Engineering, Sohar University, Sohar, Oman
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Kannan P, Cheing G, Fung B, Leung WC, Tang G, Chung R, Chan P. A new biofeedback device to improve adherence to pelvic floor muscle training in women with urinary incontinence: a randomised controlled pilot trial (abridged secondary publication). Hong Kong Med J 2022; 28 Suppl 6:23-24. [PMID: 36535794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Affiliation(s)
- P Kannan
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University
| | - G Cheing
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University
| | - B Fung
- Physiotherapy Department, Kwong Wah Hospital
| | - W C Leung
- Department of Obstetrics and Gynaecology, Kwong Wah Hospital
| | - G Tang
- Department of Obstetrics and Gynaecology, Kwong Wah Hospital
| | - R Chung
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University
| | - P Chan
- The University of Hong Kong
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Venkataramanan K, Kannan P, Sivakumar M. Optimal sizing method with sensitivity analysis for hybrid energy storage system in electric vehicle using hybrid technique. IFS 2022. [DOI: 10.3233/jifs-222503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
This manuscript proposes a hybrid method for optimum sizing and energy management (EM) of hybrid energy storage systems (HESSs) in Electric vehicle (EV). The proposed hybrid method is combined performance of Honey Badger Algorithm (HBA) and recalling-enhanced recurrent neural network (RERNN), commonly called HBA-RERNN method. The major objective of proposed system is reducing the vehicle life time cost. The HESSs are incorporated with battery and super capacitor (SC). The proposed method is utilized to solve combined energy management and optimization size. Based on the variables, such as size of battery pack and super capacitor pack, HESS size is reflected. Depend on various sensitivity factors, the analysis of optimum hybrid energy storage systems size and financial costs are performed. At last, the performance of proposed system is implemented on MATLAB site and likened with several existing systems. From this simulation outcome, it concludes that the proposed system diminishes the overall cost and battery degradation cost as 66625 USD than the existing systems. The efficiency of the proposed system achieves 94.8763% .
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Affiliation(s)
- K. Venkataramanan
- Department of Electrical and Electronics Engineering, Vivekanandha College of Engineering for Women (Autonomous), Tiruchengode, Tamilnadu, India
| | - P. Kannan
- Department of Electrical and Electronics Engineering, Vivekanandha College of Engineering for Women, Tiruchengode, Namakkal, Tamilnadu, India
| | - M. Sivakumar
- Department of Electrical Engineering, Engineering, University of Technology and Applied Sciences-Nizwa, Sultanate of Oman
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Karuppusamy A, Sharma A, Thomas KRJ, Kannan P. Experimental and Theoretical Investigations on Chalcones Containing Pyrene. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133532] [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: 11/16/2022]
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Kannan P, Ying LH, Ngai LC, Kiu MT, Yan MT, Yan TW. Physiotherapy interventions for the management of post-mastectomy pain syndrome: A meta-analysis. Physiotherapy 2022. [DOI: 10.1016/j.physio.2021.12.307] [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: 11/27/2022]
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Sivakumar SR, Kannan P, Pachaiyappan P, Gnanavel P. Ruptured cardiac hydatid cyst presenting as cardiac tamponade - A glimpse of its diagnostic perplexity and successful recovery. Indian Heart J 2021. [DOI: 10.1016/j.ihj.2021.11.045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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9
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Gnanaraj J, Sindhu E, Nandakumaran M, Veeramani R, Kannan K, Anne Princy S, Cecily Mary M, Arumugam MA, Kannan P, Sabapathy K, Swaminathan N, Senthil Kumar G, Nambirajan N, Balasubramanian T, Ravichandran Edwin JM. Impact of COVID-19 pandemic on a developing STEMI care system from a low-middle income country- a prospective observational study. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.1452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
COVID-19 pandemic has produced a great impact in the STEMI (ST Elevation Myocardial Infarction) care systems across the world. Patient hesitancy to seek medical attention for suspected STEMI, necessity of the health care systems to prioritize COVID-19 care, safety concerns of health care workers etc., have brought in unprecedented times for both patients and health care workers. The impact of COVID-19 pandemic on the establishment of a STEMI care system is less known
Purpose
To identify the impact of COVID-19 pandemic on a developing public STEMI care system in a low-middle income country in Asia, with reference to the type of reperfusion offered and outcome.
Methods
Data on number of STEMI admissions, type of reperfusion therapy and outcome are being collected from 12 teaching hospitals as a part of a developing public regional STEMI care system based on a hub and spoke model in a low middle-income country from August 2018. These 12 “thrombolysis only” hospitals were being upgraded as “primary percutaneous coronary intervention (PPCI) capable hub hospitals” in 2019. Though the hassles of COVID-19 pandemic affected this process significantly, daily data collection in our STEMI care system continued. The maximal COVID impacted period in 2020 was identified from the online database (1) as from April to December 2020. The number, type of reperfusion and outcome of the STEMI patients treated during this period were compared to the same data collected during April-December 2019.
Results
A total of 13,137 STEMI patients were treated in our system during the two time periods “April to December 2019” and “April to December 2020”. There was a 13.3% drop in the number of STEMI treated in 2020, compared to the number treated in 2019 (6101 vs 8925; P<0.001). This drop was in proportion to the number of new cases of COVID-19 reported in our state (Fig. 1a)
We also noted a significant drop in the rate of PPCI and Pharmaco-invasive therapy (PIT) offered for STEMI in 2020 compared to 2019 in the same period (PPCI: 0.13% vs 5.9%-P<0.001 and PIT 0.64% vs 11%- P<0.001). This decrease in PPCI and PIT for STEMI also corresponded to the increase in number of new cases of COVID-19 reported (Fig. 1b). More patients received thrombolytic therapy for STEMI in 2020 compared to 2019 (73.6 vs 61.2% P<0.001). There was no change in the mortality of STEMI during this period. (Fig. 2)
Conclusion
We found a significant drop in number of patients seeking medical care for STEMI during COVID-19 pandemic. There was significant drop in the rate of PPCI and PIT offered in our STEMI care system. Thrombolytic therapy remained the predominant mode of reperfusion as before, but with a significant increased rate of thrombolysis. There was no change in mortality rate in STEMI patients. Thrombolytic therapy is an acceptable mode of reperfusion, when the balance of a STEMI care system is disturbed by extraneous influences like the COVID-19 pandemic.
Funding Acknowledgement
Type of funding sources: Public hospital(s). Main funding source(s): Tamil Nadu Innovation Initiative- Department of Planning and development, Govt of Tamil NaduNational Health Mission, Government of India
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Affiliation(s)
| | - E Sindhu
- Madras Medical College, Chennai, India
| | | | | | - K Kannan
- Stanley Medical College, Chennai, India
| | - S Anne Princy
- Tamil Nadu Government Multi Super Speciality Hospital, Chennai, India
| | - M Cecily Mary
- Tamil Nadu Government Multi Super Speciality Hospital, Chennai, India
| | - M A Arumugam
- Chengalpattu Medical College, Chengalpattu, India
| | - P Kannan
- Governnment MKM Medical College, Salem, India
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Karuppusamy A, Kannan P, Rajakumar K, Zherebtsov D. Twisted intramolecular motion arrested in aggregated state emission and the nonlinear optical properties of pyrene pyrazoline derivatives. LUMINESCENCE 2021; 36:1048-1055. [PMID: 33590657 DOI: 10.1002/bio.4032] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 01/06/2021] [Accepted: 02/11/2021] [Indexed: 11/05/2022]
Abstract
Heterocyclic pyrene pyrazoline moieties containing similar structures but with differences in thiophene (PPT), furan (PPF) and pyridine (PPP) substitutions at the terminal molecules were synthesized. Their aggregation behaviour in THF-water mixtures was investigated and results demonstrated that PPT and PPP exhibited aggregation-induced emission (AIE), whereas PPF exhibited aggregation-induced blue-shifted emission (AIBSE). PPT and PPP provided red-shifted emission, while PPF had observed blue-shifted emission at high water fractions of 70-90%, confirming that aggregation effects played a major role in the molecular structure. Two emission peaks from locally excited and twisted intramolecular charge transfer confirmed the twisted nature from the dihedral angle values of the free reorganized molecules that were completely restricted in high water fractions due to molecular aggregation. This was further confirmed from colour Commission Internationale de l'Eclairage values as well as dynamic light scattering analysis. Third-order nonlinear optical properties were studied using a Nd:Yag laser beam Z-scan technique at 532 nm. The open aperture Z-scan revealed that PPT and PPF towards the peak point endured strong saturable absorption, whereas PPP indicated a strong reverse saturable absorption process. The AIE and AIBSE mechanisms from undergoing restricted twisting intramolecular motion in the aggregated luminogens provide great insight into new developments in AIEgen materials for these optoelectronic materials.
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Affiliation(s)
- A Karuppusamy
- Department of Chemistry, Anna University, Chennai - 600025, India
| | - P Kannan
- Department of Chemistry, Anna University, Chennai - 600025, India
| | - K Rajakumar
- Nanotechnology Research and Education Centre, South Ural State University, Cheyabin, Russia
| | - D Zherebtsov
- Nanotechnology Research and Education Centre, South Ural State University, Cheyabin, Russia
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Chakraborty S, Gowrishankar J, Joshi A, Kannan P, Kohli RK, Lakhotia SC, Misra G, Nautiyal CM, Ramasubramanian K, Sathyamurthy N, Singhvi AK. Suggestions for a National Framework for Publication of and Access to Literature in Science and Technology in India. CURR SCI INDIA 2020. [DOI: 10.18520/cs/v118/i7/1026-1034] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Karuppusamy A, Kannan P. Effect of substitution on pyrazoline based donor-acceptor molecules as luminescent and their electrochemical properties. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137241] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Vijayakumar V, Karuppusamy A, Kannan P, Nagaraaj P. Synthesis of novel 2-((2-(benzothiazol-2-yl)hydrazono)methyl)naphthalen-1-ol (NBS) and its selective sensing of fluoride ions. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2019.136891] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Karuppusamy A, Arulkumar R, Kannan P, Venuvanalingam P. Effect of increasing methoxyphenyl substitution on pyrene pyrazoline enduring green light emitting materials. J Photochem Photobiol A Chem 2019. [DOI: 10.1016/j.jphotochem.2019.04.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [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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Mukherjee F, Bahekar VS, Pasha SY, Kannan P, Prasad A, Rana SK, Kanani AN, Sharma GK, Premalatha D, Srinivasan VA. Isolation and analysis of the molecular epidemiology and zoonotic significance of Mycobacterium tuberculosis in domestic and wildlife ruminants from three states in India. REV SCI TECH OIE 2019; 37:999-1012. [PMID: 30964453 DOI: 10.20506/rst.37.3.2902] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The majority of tuberculosis cases in ruminants are caused by Mycobacterium bovis (MB). However, in this study, the authors reported the isolation of Mycobacterium tuberculosis (MT) from bovine milk, nasal swabs and post-mortem tissue samples (n = 841) collected from cattle and buffaloes in the states of Telangana, Maharashtra and Gujarat in India in the period from 2010 to 2015. The isolates (n = 7) were confirmed as Mycobacterium due to their growth characteristics and colony morphology in a commercial liquid medium Mycobacterial Growth Indicator Tube (MGIT)™ employing the BD BACTEC™ MGIT™ 960 system and the Löwenstein-Jensen (LJ) medium supplemented with glycerol but not with sodium pyruvate, and BD-DIFCO™ Middlebrook 7H10 agar containing oleic albumin dextrose catalase (OADC). These isolates were initially identified as members of the M. tuberculosis complex (MTC) using a commercial nested polymerase chain reaction (PCR) kit based on the IS6110 MTC specific nucleotide sequence. The isolates were confirmed as MT using three commercial line probe assay kits, were further genotyped, and the spoligotypes identified were of East African Indian (EAI) 3_IND, EAI5, Central-Asian (CAS) 1_DELHI, U and T1 lineages. Two MT isolates from one antelope (Antilope cervipara) andone gazelle (Gazella bennettii) from Gujarat, which were identified previously, were spoligotyped during this study and identified as belonging to EAI3_IND and EAI5 lineages, respectively. The epidemiological significance and zoonotic implications of regional presence and documentation of the same or two differents poligotypes in different species within the family Bovidae as well as humans is discussed.
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Kannan P, Winser S, Fung B, Cheing G. Pelvic floor muscle training alone and in combination with biofeedback and/or electrical stimulation for urinary incontinence following prostatectomy: a meta-analysis. Physiotherapy 2019. [DOI: 10.1016/j.physio.2018.11.269] [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: 10/27/2022]
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Vandana T, Karuppusamy A, Arulkumar R, Venuvanalingam P, Kannan P. Resemblances of experiment and theory on aryl substituted luminogenic polypyrazolines. NEW J CHEM 2019. [DOI: 10.1039/c9nj01221d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Polyarylpyrazolines (PPB, PPA, PPT, PPBt) containing various aryl substituents emit light in a broad color range from orange to blue, making them suitable for optoelectronics.
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Affiliation(s)
- T. Vandana
- Department of Chemistry
- Anna University
- Chennai
- India
| | | | - R. Arulkumar
- Theoretical and Computational Chemistry Laboratory
- School of Chemistry
- Bharathidasan University
- Tiruchirappalli 620 024
- India
| | - P. Venuvanalingam
- Theoretical and Computational Chemistry Laboratory
- School of Chemistry
- Bharathidasan University
- Tiruchirappalli 620 024
- India
| | - P. Kannan
- Department of Chemistry
- Anna University
- Chennai
- India
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Keerthiga R, Kaliyappan T, Kannan P. Studies on twist bent core zinc (II) methacrylate supramolecular columnar hexagonal phase mesogen derived from azobenzene moiety and its photo luminescent behaviours. INORG CHEM COMMUN 2019. [DOI: 10.1016/j.inoche.2018.11.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Kannan P, Winser SJ, Fung B, Cheing G. Effectiveness of Pelvic Floor Muscle Training Alone and in Combination With Biofeedback, Electrical Stimulation, or Both Compared to Control for Urinary Incontinence in Men Following Prostatectomy: Systematic Review and Meta-Analysis. Phys Ther 2018; 98:932-945. [PMID: 30137629 DOI: 10.1093/ptj/pzy101] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Accepted: 05/01/2018] [Indexed: 02/07/2023]
Abstract
BACKGROUND The efficacy of pelvic floor muscle training (PFMT) alone and in combination with biofeedback (BFB), electrical stimulation (ES), or both for urinary incontinence in men following prostatectomy is inconclusive. PURPOSE The purpose of this study was to determine whether PFMT works well alone or in combination with BFB, ES, or both in comparison with a control. DATA SOURCES The databases Ovid Medline, EMBASE, CENTRAL, Scopus, and Web of Science, and the specialized register of the Citroen Incontinence Review Group were searched from study inception to August 2017. Abstract proceedings from urological meetings, including the European Association of Urology and the American Urological Association, were also searched. STUDY SELECTION Randomized controlled trials that compared PFMT alone and PFMT with ES, BFB, or both and no treatment, placebo, or sham were included in the review. DATA EXTRACTION, SYNTHESIS, AND QUALITY Two independent reviewers completed data extraction and quality appraisal. The Grading of Recommendations, Assessment, Development, and Evaluation tool was used for quality appraisal. Meta-analysis was done with software used for preparing and maintaining Cochrane reviews. LIMITATIONS Methodological flaws in the included studies limited internal validity. CONCLUSIONS PFMT alone, PFMT plus BFB and ES, and PFMT plus ES were more effective than the control for urinary incontinence following prostatectomy. The effect of PFMT plus BFB on postprostatectomy incontinence remains uncertain.
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Affiliation(s)
- P Kannan
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
| | - S J Winser
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University
| | - B Fung
- Physiotherapy Unit, Kwong Wah Hospital, Yau Ma Tei, Hong Kong
| | - G Cheing
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University
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Arunmozhivarman K, Radhika R, Kannan P, Maroudam V, Vijayalakshmi K, Valentina Claudet P, Dhinakar Raj G. Isolation and Identification of M. tuberculosis from Sheep Tissue Samples and Sero-Diagnosis Study in an Organized Sheep Farm. ACTA ACUST UNITED AC 2018. [DOI: 10.20546/ijcmas.2018.701.328] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Kannan P, Lakshmanan G, Al Shoaibi A, Srinivasakannan C. Equilibrium model analysis of waste plastics gasification using CO 2 and steam. Waste Manag Res 2017; 35:1247-1253. [PMID: 29100482 DOI: 10.1177/0734242x17736946] [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] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Utilization of carbon dioxide (CO2) in thermochemical treatment of waste plastics may significantly help to improve CO2 recycling, thus simultaneously curtailing dioxins/furans and CO2 emissions. Although CO2 is not such an effective gasifying agent as steam, a few investigations have explored the utilization of CO2 in conjunction with steam to achieve somewhat higher carbon conversion. This work presents a comparative evaluation study of CO2 and steam gasification of a typical post-consumer waste plastics mixture using an Aspen Plus equilibrium model. The effect of flow rate of gasifying medium (CO2 and/or steam) and gasification temperature on product gas composition, carbon conversion, and cold gas efficiency has been analyzed. Simulation results demonstrate that CO2 can serve as a potential gasifying agent for waste plastics gasification. The resulting product gas was rich in CO whereas CO2-steam blends yield a wider H2/CO ratio, thus extending the applications of the product gas.
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Affiliation(s)
- P Kannan
- Department of Chemical Engineering, The Petroleum Institute, Abu Dhabi, UAE
| | - G Lakshmanan
- Department of Chemical Engineering, The Petroleum Institute, Abu Dhabi, UAE
| | - A Al Shoaibi
- Department of Chemical Engineering, The Petroleum Institute, Abu Dhabi, UAE
| | - C Srinivasakannan
- Department of Chemical Engineering, The Petroleum Institute, Abu Dhabi, UAE
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Karuppusamy A, Vandana T, Kannan P. Pyrene based chalcone materials as solid state luminogens with aggregation-induced enhanced emission properties. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2017.05.026] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [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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Santhoshkumar P, Kannan P, Veeramani A, Samson A, Karthick S, Leonaprincy J. <b>A preliminary report on the impact of road kills on the herpetofauna species in Nilgiris, Tamil Nadu, India</b>. J Threat Taxa 2017. [DOI: 10.11609/jott.3001.9.3.10004-10010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
To know the situation of road hits of amphibians and reptile species, a survey was conducted during the period 02 June 2013 to 25 May 2014. A total of 172 incidents of road kill of different species were noticed, representing 12 species of herpetofauna, including five amphibian species of the families Bufonidae, Dicroglossidae, Microhylidae and Rhacophoridae, and seven species of reptiles of the families Scincidae, Agamidae, Uropeltidae, Colubridae, Natricidae and Xenodermatidae. Reptiles were the most affected group (60%), of which more than 79.61% of the road kills were snakes. The most affected snake species were endemic Xylophis perroteti (64.63%).
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Abstract
Hematohidrosis or hematidrosis is a rare condition in which a human being sweats blood. Psychogenic cause is found to be the most frequent cause among other causes such as systemic disease and vicarious menstruation. This is a case report of a 10-year-old girl with oozing of blood from intact skin of scalp. Underlying intense fear secondary to psychosocial stressor was identified and a provisional diagnosis of mixed anxiety and depressive disorder was made. Pharmacotherapy and psychotherapy were followed by complete remission. It was inferred from this experience that hematohidrosis is a treatable condition if the underlying cause is correctly identified.
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Affiliation(s)
- Anu Rita Jayaraman
- Department of Psychiatry, Sree Balaji Medical College and Hospital, Chennai, Tamil Nadu, India
| | - P Kannan
- Department of Psychiatry, Kilpauk Medical College, Chennai, Tamil Nadu, India
| | - V Jayanthini
- Department of Psychiatry, Institute of Child Health, Madras Medical College, Chennai, Tamil Nadu, India
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Sweetline Anne N, Ronald BSM, Kumar TMAS, Kannan P, Thangavelu A. Molecular identification of Mycobacterium tuberculosis in cattle. Vet Microbiol 2016; 198:81-87. [PMID: 28062011 DOI: 10.1016/j.vetmic.2016.12.013] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Revised: 12/09/2016] [Accepted: 12/10/2016] [Indexed: 10/20/2022]
Abstract
Bovine tuberculosis continued to be a re-emerging problem in some countries especially in endemic areas due to the fact that human and animal health surveillance system is not adopted to diagnose the infection. This crisis can be attributed due to sharing of the same habitat especially in rural areas. In the present study, a total of 148 samples were collected from cattle for isolation over a period of 3 years from cattle with and without lesions, of which 67 isolates were obtained by culture. Fifty one isolates were identified as Mycobacterium tuberculosis complex (MTBC) by IS6110 PCR of which 43 (84.3%) were identified as M. tuberculosis and 08 (15.6%) were identified as M. bovis by using 12.7kb fragment multiplex PCR. Among this, 31 isolates which were positive for IS6110 PCR were subjected to spoligotyping and revealed 28 isolates belonging to MANU1 strain of M. tuberculosis. This study clearly indicates that high prevalence of M. tuberculosis than M. bovis in bovine was identified by means of culture and by molecular methods M. tuberculosis can affect cattle producing lesion in contradiction to the earlier thoughts. This study speculates that M. tuberculosis MANU1 strain infection in cattle could be due to spill over from human or other non specific hosts in tuberculosis endemic areas. Though bovine tuberculosis due to M. tuberculosis in cattle is not considered a serious threat worldwide, in countries where human TB is endemic, M. tuberculosis infection of cattle needs to be considered.
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Affiliation(s)
- N Sweetline Anne
- Madras Veterinary College, Tamil Nadu Veterinary and Animal Sciences University (TANUVAS), Chennai-600 051, Tamilnadu, India.
| | - B S M Ronald
- Veterinary College and Research Institute, Orathanadu, TANUVAS, Tamilnadu, India.
| | - T M A Senthil Kumar
- Madras Veterinary College, Tamil Nadu Veterinary and Animal Sciences University (TANUVAS), Chennai-600 051, Tamilnadu, India
| | - P Kannan
- National Institute for Research In Tuberculosis (NIRT), Chennai, Tamilnadu, India
| | - A Thangavelu
- Madras Veterinary College, Tamil Nadu Veterinary and Animal Sciences University (TANUVAS), Chennai-600 051, Tamilnadu, India
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Santhoshkumar P, Kannan P, Ramakrishnan B, Veeramani A, Samson A, Karthick S, Leonaprincy J, Nisha B, Dineshkumar N, Abinesh A, Vigneshkumar U, Girikaran P. Road kills of the endemic snake Perrotet’s Shieldtail Plectrurus perrotetii, Dumeril, 1851 (Reptilia: Squamata: Uropeltidae) in Nilgiris, Tamil Nadu, India. J Threat Taxa 2016. [DOI: 10.11609/jott.2494.8.11.9375-9376] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Twenty seven road killed specimens of Plectrurus perrotetii were recorded in Emerald and its surrounding areas in the Nilgiris. Among the road kills, fourteen of them were females, seven were males and six are juveniles. Among the road kill female specimens of this species, it was observed that seven were gravid with fully developed young. Three to six developing young ones were observed
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Kannan P, Amirthagadeswaran K, Christopher T, Nageswara Rao B. A simplified approach for assessing the leak-before-break for the flawed pressure vessels. Nuclear Engineering and Design 2016. [DOI: 10.1016/j.nucengdes.2016.02.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Kannan P, Mukherji A, Saravanan K, Reddy KS, Vivekanandam S, Shamsudheen C, Santhosh V. Change in the Quality of Life in Oropharyngeal, Laryngeal and Hypopharyngeal Cancer Patients treated with Volumetric Modulated Arc-Based Concomitant Boost Radiotherapy. Gulf J Oncolog 2016; 1:36-45. [PMID: 27250886] [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] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/15/2016] [Indexed: 06/05/2023]
Abstract
OBJECTIVE To assess the change in the quality of life (QOL) in Oropharyngeal, Laryngeal and Hypopharyngeal cancer patients treated with concomitant boost radiotherapy by Volumetric Intensity Modulated Arc Therapy (VMAT) technique. METHODS Thirty patients with oropharynx, larynx or hypopharynx cancers of stage II to IVA were treated with an Accelerated fractionation schedule using Concomitant boost. The dose given was 1.8Gy/fraction daily, 5 days a week to the large field for 28 fractions and a daily concomitant boost of 1.5Gy/fraction to the boost field over the last 12 treatment days for a total dose of 68.4Gy/40 fractions/5½weeks by VMAT technique with concurrent chemotherapy (in stage III and IV patients) using Cisplatin 100mg/m2 IV three weekly during week 1 and week 4 of irradiation. QOL was assessed using the European Organization of Research and Treatment of Cancer Quality of Life Core Questionnaire, version 3.0 (EORTC QLQC30) and EORTC head and neck module (EORTC QLQ-HN35) before treatment, at the end of treatment, 1 month, 3 months and 6 months post treatment. The QOL scores and their evolution over the five measurements were calculated. RESULTS The change in the QOL scores was acceptable in general. There was a significant reduction in quality of life scores at the end of treatment. The QOL improved in the followup period; and by 3 months post irradiation, there was a return of QOL scores to the baseline value. CONCLUSION The QOL scores indicate that concomitant boost radiotherapy by VMAT is well tolerated and helps in rapid return to baseline quality of life scores. We believe that this is one of the first papers which have combined concomitant boost radiotherapy with VMAT technique in head and neck cancers. VMAT based concomitant boost radiotherapy helps in rapid return to baseline quality of life.
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Affiliation(s)
- P Kannan
- Department of Radiotherapy, JIPMER, Puducherry, India
| | - A Mukherji
- Department of Radiotherapy, JIPMER, Puducherry, India
| | - K Saravanan
- Department of Radiotherapy, JIPMER, Puducherry, India
| | - K S Reddy
- Department of Oncology, Mahatma Gandhi Medical College and Research Centre, Puducherry, India
| | | | - C Shamsudheen
- Malabar Institute of Medical Sciences, Kozhikode, Kerala, India
| | - V Santhosh
- Kailash Cancer Hospital and Research Institute, Vadodara, Gujarat, India
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M VK, Bakiyathu SB, Kannan P, Mahendran PP. Delineation and geographic information system (GIS) mapping of soil nutrient status of sugarcane growing tracts of Theni district, Tamil Nadu. ACTA ACUST UNITED AC 2015. [DOI: 10.5897/ajar2013.7251] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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Kannan P, Dutt S, Bhat R. Intra-cardiac Tumor in Newborn: An Echo Presentation. J Assoc Physicians India 2015; 63:84-86. [PMID: 26710412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Cardiac tumors represent a relatively rare, yet challenging diagnosis. Echocardiography is the main diagnostic tool for the detection of a cardiac tumor. We report a case of congenital giant intra-cardiac tumor, in which echocardiography revealed a large well-defined hyperechoic homogenous intracardiac mass involving interventricular septum which mimicked like asymmetrical septal hypertrophic pattern and another two small masses attached to right ventricular part of interventricular septum.
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Kenny D, Ball J, Bloxham C, Cashmore G, Dick F, Kannan P, Baxter D, Mani R. An evaluation of the psychometric properties of the STarT Back Screening Tool—a systematic review. Physiotherapy 2015. [DOI: 10.1016/j.physio.2015.03.1799] [Citation(s) in RCA: 3] [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: 11/28/2022]
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Ramkumar V, Anandhi S, Kannan P, Gopalakrishnan R. Substitution effect on chalcone based materials for corrosion and photocrosslinking applications. RSC Adv 2015. [DOI: 10.1039/c4ra10884a] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [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
Hydroxy (–OH) and benzyloxy (–OCH2Ph) substituted chalcone based crystalline materials were synthesized and characterized; these materials exhibited high corrosion inhibitor efficiency and enhanced photo-crosslinking applications.
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Affiliation(s)
- V. Ramkumar
- Department of Chemistry
- Anna University
- Chennai-25
- India
| | - S. Anandhi
- Department of Physics
- Maamallan Institute of Technology
- Chennai
- India
| | - P. Kannan
- Department of Chemistry
- Anna University
- Chennai-25
- India
| | - R. Gopalakrishnan
- Crystal Research Laboratory
- Department of Physics
- Anna University
- Chennai-25
- India
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Lavanya K, Kannan P, Palanisamy K, Natesan M. Comparison Study of Volatile Corrosion Inhibitors in Steam And Cl2 Gas Environment on Mild Steel. Arab J Sci Eng 2014. [DOI: 10.1007/s13369-013-0844-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Affiliation(s)
- P. Kannan
- Department of Electronics and Communication Engineering, PET Engineering College, Vallioor, Tirunelveli District, Tamilnadu, India
| | - R. Shantha Selva Kumari
- Department of Electronics and Communication Engineering, Mepco Schlenk Engineering College, Sivakasi, Tamil Nadu, India
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Ramkumar V, Anandhi S, Kannan P, Gopalakrishnan R. Synthesis, single crystal growth, characterization and comparison of two new enone shifted chalcones and their NLO behaviour. CrystEngComm 2013. [DOI: 10.1039/c2ce26185e] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Srinivasan MV, Kannan P, Roy A. Photo and electrically switchable behavior of azobenzene containing pendant bent‐core liquid crystalline polymers. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/pola.26455] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
| | - P. Kannan
- Department of Chemistry, Anna University, Chennai, India
| | - A. Roy
- Soft Condensed Matter, Raman Research Institute, Bangaluru, India
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Choudhary A, Lagatsky AA, Kannan P, Sibbett W, Brown CTA, Shepherd DP. Diode-pumped femtosecond solid-state waveguide laser with a 4.9 GHz pulse repetition rate. Opt Lett 2012; 37:4416-4418. [PMID: 23114314 DOI: 10.1364/ol.37.004416] [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] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We report on the first demonstration of a passively mode-locked, diode-pumped, monolithic Yb:glass channel waveguide laser that incorporates a semiconductor saturable absorber mirror. Stable and self-starting mode-locking is achieved in a Fabry-Perot cavity configuration producing a pulse repetition rate up to 4.9 GHz. The shortest pulse duration of 740 fs is generated with 30 mW of average output power at a center wavelength of 1058 nm. A maximum output power of 81 mW is produced during mode-locking with corresponding pulse duration of 800 fs.
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Affiliation(s)
- A Choudhary
- Optoelectronics Research Centre, University of Southampton, Highfield, Southampton, UK
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Abstract
This paper describes the synthesis of fused spherical gold nanoparticles (AuNPs) and their electrocatalytic activity towards the oxidation of hydroxylamine (HA). Fused AuNPs were prepared by one-pot synthesis using 2-mercapto-4-methyl-5-thiazoleacetic acid (TAA) as a stabilizing agent and sodium borohydride (NaBH4) as a reducing agent. The HR-TEM images showed that two individual AuNP were joined via on its surface with a size range of approximately 7 nm and a length of approximately 15 nm diameter. The pH studies showed that the synthesized fused AuNPs was stable at pH > 8. This indicated that the carboxylate ion present on the TAA molecule stabilized the AuNPs from aggregation. Further, the fused AuNPs were utilized for the electrocatalytic oxidation of hydroxylamine (HA) after immobilized them on (3-mercaptopropyl)-trimethoxysilane (MPTS) sol-gel film modified Au electrode. The AuNPs modified electrode showed an excellent electrocatalytic activity towards the oxidation of HA in 0.2 M phosphate buffer solution (pH 7.2) by shifting its oxidation potential to 100 mV less positive and enhancing its oxidation current for more than three times when compared to bare Au electrode. Further, it was found that the fused AuNPs modified electrode showed greater electrocatalytic activity towards HA than the spherical AuNPs modified electrodes.
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Affiliation(s)
- P Kannan
- Department of Chemistry, Gandhigram Rural University, Gandhigram, Dindigul 624302, India
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Kannan P, Brimacombe K, Zoghbi S, Liow JS, Morse C, Taku A, Telu S, Pike V, Halldin C, Gottesman M, Hall M, Innis R. [11C]N-desmethyl-loperamide, a substrate that selectively images P-glycoprotein function, is trapped in lysosomes. Neuroimage 2010. [DOI: 10.1016/j.neuroimage.2010.04.057] [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: 10/19/2022] Open
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Affiliation(s)
- S. Balamurugan
- Department of Chemistry, Anna University, Chennai 600-025, India, and Department of Chemical Engineering, Tatung University, 40 Chungshan N. Rd., third sec, Taipei 104, Taiwan, ROC
| | - P. Kannan
- Department of Chemistry, Anna University, Chennai 600-025, India, and Department of Chemical Engineering, Tatung University, 40 Chungshan N. Rd., third sec, Taipei 104, Taiwan, ROC
| | - M. T. Chuang
- Department of Chemistry, Anna University, Chennai 600-025, India, and Department of Chemical Engineering, Tatung University, 40 Chungshan N. Rd., third sec, Taipei 104, Taiwan, ROC
| | - S. L. Wu
- Department of Chemistry, Anna University, Chennai 600-025, India, and Department of Chemical Engineering, Tatung University, 40 Chungshan N. Rd., third sec, Taipei 104, Taiwan, ROC
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Kannan P, John SA. Highly sensitive electrochemical determination of nitric oxide using fused spherical gold nanoparticles modified ITO electrode. Electrochim Acta 2010. [DOI: 10.1016/j.electacta.2010.01.084] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Balamurugan R, Kannan P. Photoisomerization behavior of bisbenzylidene and 1,3,4-oxadiazole-based liquid crystalline polyesters. J Appl Polym Sci 2010. [DOI: 10.1002/app.31742] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Saravanan C, Kannan P. Dual-mode optical switching property of copolymers containing pendant nitro and cyano substituted azobenzenes and fulgimide units. Polym Degrad Stab 2009. [DOI: 10.1016/j.polymdegradstab.2009.02.011] [Citation(s) in RCA: 12] [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: 10/21/2022]
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