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Suresh J, Karthik S, Arun A. Cis-trans isomerism shown by the polymer containing chalcone moiety in its side chain. POLYM ADVAN TECHNOL 2016. [DOI: 10.1002/pat.3791] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Vakees E, Suresh J, Kayalvizhi M, Thangaraj V, Karthik S, Arun A. Triblock Copolymers Based on Monohydroxy Polystyrene with Crystallizable Amide Segments: Synthesis and Characterization. ADVANCES IN POLYMER TECHNOLOGY 2016. [DOI: 10.1002/adv.21541] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Vinoth M, Suriyaprabha R, Arunmetha S, Karthik A, Karthik S, Paramasivam P, Prabu P, Manivasakan P, Saminathan K, Rajendran V. Synthesis of Nothapodytes Nimmoniana Leaf Nanoparticles for Antireflective and Self-Cleaning Applications. ACTA ACUST UNITED AC 2016. [DOI: 10.1080/15533174.2015.1040164] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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54
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Paul A, Jana A, Karthik S, Bera M, Zhao Y, Singh NDP. Photoresponsive real time monitoring silicon quantum dots for regulated delivery of anticancer drugs. J Mater Chem B 2016; 4:521-528. [DOI: 10.1039/c5tb02045j] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Photoluminescent silicon quantum dots (SiQDs) decorated using o-nitrobenzyl (ONB) derivative as a phototrigger for real-time monitoring of chlorambucil (Cbl) based on Photoinduced Electron Transfer (PET).
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Kabade S, Venkatesh Y, Karthik S, Kumar V. Comparative study of granisetron versus pethidine for the prevention of perioperative shivering under spinal Anesthesia. ACTA ACUST UNITED AC 2016. [DOI: 10.4103/2394-6954.190769] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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56
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Al-Ameri A, Malhotra P, Thygesen H, Vaidyanathan S, Karthik S, Scarsbrook A, Callister M. S74 Assessing the diagnostic accuracy of the British Thoracic Society algorithm for investigation of solid pulmonary nodules. Thorax 2015. [DOI: 10.1136/thoraxjnl-2015-207770.80] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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57
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Snoddon A, Karthik S. Safety checklist for image guided interventions in a teaching hospital computed tomography (CT) department. Clin Radiol 2015. [DOI: 10.1016/j.crad.2015.06.040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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58
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Selvam S, Choi SJ, Vaidyanathan S, Karthik S. Efficiency and accuracy of consultant and specialist radiology review of acute and on-call neck sepsis imaging. Clin Radiol 2015. [DOI: 10.1016/j.crad.2015.06.090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Al-Ameri A, Malhotra P, Thygesen H, Plant PK, Vaidyanathan S, Karthik S, Scarsbrook A, Callister MEJ. Authors' response--Risk of malignancy in pulmonary nodules: a validation study of four prediction models. Lung Cancer 2015; 90:119-20. [PMID: 26271548 DOI: 10.1016/j.lungcan.2015.07.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Accepted: 07/25/2015] [Indexed: 12/26/2022]
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60
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Shinto AS, Kamaleshwaran KK, Chakraborty S, Vyshakh K, Thirumalaisamy SG, Karthik S, Nagaprabhu VN, Vimalnath KV, Das T, Banerjee S. Radiosynovectomy of Painful Synovitis of Knee Joints Due to Rheumatoid Arthritis by Intra-Articular Administration of (177)Lu-Labeled Hydroxyapatite Particulates: First Human Study and Initial Indian Experience. World J Nucl Med 2015; 14:81-8. [PMID: 26097417 PMCID: PMC4455177 DOI: 10.4103/1450-1147.153908] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
The aim of this study is to assess the effectiveness of Radiosynovectomy (RSV) using 177Lu-labeled hydroxyapatite (177Lu-HA) in the treatment of painful synovitis and recurrent joint effusion of knee joints in rheumatoid arthritis (RA). Ten patients, diagnosed with RA and suffering from chronic painful resistant synovitis of the knee joints were referred for RSV. The joints were treated with 333 ± 46 MBq of 177Lu-HA particles administered intra-articularly. Monitoring of activity distribution was performed by static imaging of knee joint and whole-body gamma imaging. The patients were evaluated clinically before RSV and at 6 months after the treatment by considering the pain improvement from baseline values in terms of a 100-point visual analog scale (VAS), the improvement of knee flexibility and the pain remission during the night. RSV response was classified as poor (VAS < 25), fair (VAS ≥ 25-50), good (VAS ≥ 50-75) and excellent (VAS ≥ 75), with excellent and good results considered to be success, while fair and poor as failure and also by range of motion. Three phase bone scan (BS) was repeated after 6 months and changes in the second phase of BS3 were assessed visually, using a four-degree scale and in the third phase, semiquantitatively with J/B ratio to see the response. Biochemical analysis of C-reactive protein (CRP) and fibrinogen was repeated after 48 h, 4 and 24 weeks. In all 10 patients, no leakage of administered activity to nontarget organs was visible in the whole-body scan. Static scans of the joint at 1 month revealed complete retention of 177Lu-HA in the joints. All patients showed decreased joint swelling and pains, resulting in increased joint motion after 6 months. The percentage of VAS improvement from baseline values was 79.5 ± 20.0% 6 months after RS and found to be significantly related to patients' age (P = 0.01) and duration of the disease (P = 0.03). Knees with Steinbrocker's Grades 0 and I responded better than those with more advanced changes (Steinbrocker's Grades III and IV) in terms of VAS improvement (75% vs. 45.8%) (P < 0.001). The overall success rate (VAS ≥ 50) was 80%. Remission of pain during the night was achieved in 100%, and knee flexibility was improved in 80%. The changes in the blood pool phase before RSV were 3.2 ± 0.7 and after the therapy 1.4 ± 0.7 (P < 0.001). The J/B ratio was: Before RSV 2.4 ± 0.3; after treatment 1.0 ± 0.2 (P < 0.05). CRP concentration 4 and 24 weeks after the therapy was significantly lower than before treatment. The fibrinogen level was not different before and after RSV. RSV side-effects assessed for the whole follow-up period were minor and not significant. RSV with 177Lu-HA was safe and effective in patients with knee joint chronic painful synovitis of rheumatoid origin. It exhibited significant therapeutic effect after 6 months follow-up period with no significant side-effects. The preliminary investigations reveal that 177Lu-labeled HA particles hold considerable promise as a cost-effective agent for RSV. More elaborate and controlled clinical trials are necessary to evaluate the therapeutic efficacy and safety of the agent compared with the treatment with other radionuclides and glucocorticosteroids.
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Teo WY, Karthik S, Pratap SV, Li X, Shen J, Elghetany MT, Hui KM, Lau CC. IM-06 * A BIOINFORMATICS EVALUATION OF TUMOR-ASSOCIATED MACROPHAGES ACROSS 2 BRAIN TUMOR TYPES. Neuro Oncol 2015. [DOI: 10.1093/neuonc/nov061.61] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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62
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Sudha GF, Karthik S, Kumar NS. Activity aware energy efficient priority based multi patient monitoring adaptive system for body sensor networks. Technol Health Care 2015; 22:167-77. [PMID: 24576812 DOI: 10.3233/thc-140782] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND According to WHO, Cardiovascular diseases are the major cause of death worldwide. Due to the increase in cardiac diseases, miniaturized and energy efficient remote cardiac monitoring systems are required. OBJECTIVE To develop an Activity Aware Energy Efficient priority based Multi Patient Monitoring protocol for Body Sensor Networks to monitor physiological signals continuously. The protocol must also be adaptive to allow for new connections and to renegotiate the nodes services. METHOD In this protocol, the ECG signals of multiple patients are monitored one after another in a cyclic order. Slots are allotted to each patient by means of a dynamic TDMA scheme where the slot duration is dependent upon the criticality of the patient. A Network configuration slot is provided at the end of each frame to reconfigure the network. Using the wearer's activity level, the sensor dynamically manages its activities namely, sampling of the ECG sensor, processing of the data, and wireless transmission to minimize overall power consumption. Additional energy efficiency is achieved by assigning priorities to the devices connected in the network and turning them on and off periodically based on their priorities. RESULTS The protocol is implemented on Shimmer nodes and ECG signals of N patients are monitored. The reconfiguration of the node's priority and sampling rate based on the health condition of the patient are demonstrated. A comparison of energy consumption, packet delivery ratio and battery life time is made. CONCLUSIONS Energy consumption and nodes lifetime are the parameters to be optimized in the case of BSN. The AAEEPMPM protocol for BSN has been designed and implemented in hardware platform for energy efficiency. The results obtained from the BSN shows that this protocol has higher energy efficiency and provides better lifetime for the network.
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Al-Ameri A, Malhotra P, Thygesen H, Plant PK, Vaidyanathan S, Karthik S, Scarsbrook A, Callister MEJ. Risk of malignancy in pulmonary nodules: A validation study of four prediction models. Lung Cancer 2015; 89:27-30. [PMID: 25864782 DOI: 10.1016/j.lungcan.2015.03.018] [Citation(s) in RCA: 108] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Revised: 02/24/2015] [Accepted: 03/20/2015] [Indexed: 11/29/2022]
Abstract
OBJECTIVES Clinical prediction models assess the likelihood of malignancy in pulmonary nodules detected by computed tomography (CT). This study aimed to validate four such models in a UK population of patients with pulmonary nodules. Three models used clinical and CT characteristics to predict risk (Mayo Clinic, Veterans Association, Brock University) with a fourth model (Herder et al. [4]) additionally incorporating (18)Fluorine-Fluorodeoxyglucose (FDG) avidity on positron emission tomography-computed tomography (PET-CT). MATERIALS AND METHODS The likelihood of malignancy was calculated for patients with pulmonary nodules (4-30mm diameter) and data used to calculate the area under the receiver operating characteristic curve (AUC) for each model. The models were used in a restricted cohort of patients based on each model's exclusion criteria and in the total cohort of all patients. RESULTS Two hundred and forty-four patients were studied, of whom 139 underwent FDG PET-CT. Ninety-nine (40.6%) patients were subsequently confirmed to have malignant nodules (33.2% primary lung cancer, 7.4% metastatic disease). The Mayo and Brock models performed similarly (AUC 0.895 and 0.902 respectively) and both were significantly better than the Veterans Association model (AUC 0.735, p<0.001 and p=0.002 respectively). In patients undergoing FDG PET-CT, the Herder model had significantly higher accuracy than the other three models (AUC 0.924). When the models were tested on all patients in the cohort (i.e. including those outside the original model inclusion criteria) AUC values were reduced, yet remained high especially for the Herder model (AUC 0.916). For sub-centimetre nodules, AUC values for the Mayo and Brock models were 0.788 and 0.852 respectively. CONCLUSIONS The Mayo and Brock models showed good accuracy for determining likelihood of malignancy in nodules detected on CT scan. In patients undergoing FDG PET-CT for nodule evaluation, the highest accuracy was seen for the model described by Herder et al. incorporating FDG avidity.
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Ghosal T, Dolai TK, Mandal PK, Karthik S, Bandyopadhyay A. Platelet Aggregation Study in Patients With Hemoglobin Eβ Thalassemia in India. Clin Appl Thromb Hemost 2015; 22:575-80. [PMID: 25701765 DOI: 10.1177/1076029615573302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Hemoglobin Eβ thalassemia is a major public health problem in India, especially in the state of West Bengal. Various thromboembolic events are common, especially in splenectomized patients. Platelet hyperactivity most likely plays a pathogenetic role. To investigate the role of platelets in hypercoagulability, platelet aggregation tests were undertaken in the present study. Platelet-rich plasma from 30 patients with Eβ thalassemia (15 splenectomized and 15 nonsplenectomized) were studied and compared with 15 healthy participants. The 4 agonists used were adenosine 5-diphosphate, adrenaline (epinephrine), collagen, and ristocetin. The current study shows both splenectomized and nonsplenectomized patients had abnormal aggregation compared to normal healthy controls. Splenectomized patients had higher platelet aggregation than nonsplenectomized patients for all 4 agonists; but statistically significant difference among 2 groups was found only for collagen. The present study confirms a role of splenic absence in platelet hyperaggregation.
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Al-Ameri A, Malhotra P, Thygesen H, Vaidyanathan S, Karthik S, Scarsbrook A, Plant P, Callister M. 37: The added value of positron emission tomography to a clinical prediction model for pulmonary nodules. Lung Cancer 2015. [DOI: 10.1016/s0169-5002(15)50037-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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66
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Gangopadhyay M, Mukhopadhyay SK, Karthik S, Barman S, Pradeep Singh ND. Targeted photoresponsive TiO2–coumarin nanoconjugate for efficient combination therapy in MDA-MB-231 breast cancer cells: synergic effect of photodynamic therapy (PDT) and anticancer drug chlorambucil. MEDCHEMCOMM 2015. [DOI: 10.1039/c4md00481g] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
We have developed for the first time an excellent targeted metallic single component nanoparticle system for combination of PDT and chemotherapy.
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Shah SS, Karthik S, Singh NDP. Vis/NIR light driven mild and clean synthesis of disulfides in the presence of Cu2(OH)PO4 under aerobic conditions. RSC Adv 2015. [DOI: 10.1039/c5ra05138j] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A highly efficient one-pot strategy has been developed for the synthesis of disulfide in the presence of air under the irradiation of Vis/NIR light.
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Karthik S, Prashanth Kumar BN, Gangopadhyay M, Mandal M, Singh NDP. A targeted, image-guided and dually locked photoresponsive drug delivery system. J Mater Chem B 2015; 3:728-732. [DOI: 10.1039/c4tb01583e] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have developed a new targeted image-guided photoresponsive drug delivery system (DDS) based on a dual locking strategy.
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Al-Ameri A, Malhotra P, Thygesen H, Vaidyanathan S, Plant P, Karthik S, Scarsbrook A, Callister M. S72 Clinical Prediction Models For Malignancy In Solitary Pulmonary Nodules - A Validation Study In A Uk Population. Thorax 2014. [DOI: 10.1136/thoraxjnl-2014-206260.78] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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70
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Uma P, Suresh J, Selvaraj R, Karthik S, Arun A. Quinoline based polymeric drug for biological applications: synthesis, characterization, antimicrobial, and drug releasing studies. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2014; 26:128-42. [DOI: 10.1080/09205063.2014.985022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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71
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Shashank AB, Karthik S, Madhavachary R, Ramachary DB. An Enolate-Mediated Organocatalytic Azide-Ketone [3+2]-Cycloaddition Reaction: Regioselective High-Yielding Synthesis of Fully Decorated 1,2,3-Triazoles. Chemistry 2014; 20:16877-81. [DOI: 10.1002/chem.201405501] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Indexed: 12/22/2022]
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72
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Stadler CL, Karthik S, Patel CN, Albazaz R, Chowdhury FU. Developing and evaluating an undergraduate radiology teaching programme. Clin Radiol 2014. [DOI: 10.1016/j.crad.2014.05.034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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73
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Johnstone AL, Win A, Darby M, Bhartia B, Karthik S. Risks and rewards of CT-guided thoracic biopsy. Complications audit and patient experience survey. Clin Radiol 2014. [DOI: 10.1016/j.crad.2014.05.056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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74
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Ramachary DB, Shashank AB, Karthik S. An organocatalytic azide-aldehyde [3+2] cycloaddition: high-yielding regioselective synthesis of 1,4-disubstituted 1,2,3-triazoles. Angew Chem Int Ed Engl 2014; 53:10420-4. [PMID: 25079606 DOI: 10.1002/anie.201406721] [Citation(s) in RCA: 154] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Indexed: 12/26/2022]
Abstract
An organocatalytic azide-aldehyde [3+2] cycloaddition (organo-click) reaction of a variety of enolizable aldehydes is reported. The organo-click reaction is characterized by a high rate and regioselectivity, mild reaction conditions, easily available substrates with simple operation, and excellent yields with a broad spectrum of substrates. It constitutes an alternative to the previously known CuAAC, RuAAC, and IrAAC click reactions.
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Ramachary DB, Shashank AB, Karthik S. An Organocatalytic Azide-Aldehyde [3+2] Cycloaddition: High-Yielding Regioselective Synthesis of 1,4-Disubstituted 1,2,3-Triazoles. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201406721] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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