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Roy K, Champagne J, Sarrazin J, Nault I, O'Hara G, Blier L, Molin F, Philippon F. ICD Generator Change With a Functional Sprint Fidelis Lead: Reuse It or Not? Can J Cardiol 2013. [DOI: 10.1016/j.cjca.2013.07.309] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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77
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Bibas L, Roy K, Sant'Anna R, Vinet A, Jacquemet V, Dubé B, Becker G, Kus T, Nadeau R, Leblanc R, Sturmer M. The Effect of Ventricular Stimulation on the QT Interval in Patients With Pacemakers. Can J Cardiol 2013. [DOI: 10.1016/j.cjca.2013.07.308] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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78
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Nandy A, Kar S, Roy K. Development and validation of regression-based QSAR models for quantification of contributions of molecular fragments to skin sensitization potency of diverse organic chemicals. SAR AND QSAR IN ENVIRONMENTAL RESEARCH 2013; 24:1009-1023. [PMID: 23988224 DOI: 10.1080/1062936x.2013.821422] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In our present work, we have developed regression-based QSAR models for skin sensitization potential of 51 diverse organic chemicals. The objective behind the present work is to determine the influence of different molecular features on the skin sensitizing potential of chemicals. Among several models developed, the two best ones are discussed to unveil specific information regarding the contribution of different structural and physicochemical features towards the property of skin sensitization. The QSAR models suggested that aromatic compounds are more skin sensitizing than aliphatic ones, but in the case of carbonyl compounds, aliphatic ones are more skin sensitizing than aromatic ones. Other descriptors such as LUMO and <2-Atype_H-47> signify the importance of the electrophilic and hydrophilic character respectively of the molecules for showing skin sensitizing property. Another two descriptors, <Dipole-mag-2.72> and (3)χC also exert significant contributions towards the skin sensitization potential of the chemicals. Further, it is observed that the nitrogen atoms (nN), triple bonds (nTB) and also the fragment Al-C(=X)-Al (Atype_C38) are responsible for skin sensitizing property. All the above information provides additional support for further research involving identification of the skin sensitization potential of new chemicals.
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Dunleavy K, Taylor A, Gow J, Cullen B, Roy K. Police officer anxiety after occupational blood and body fluid exposure. Occup Med (Lond) 2012; 62:382-4. [PMID: 22764276 DOI: 10.1093/occmed/kqs078] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND In the course of their work, police staff are at risk of exposure to blood and body fluids (BBF) and potentially at risk of acquiring a blood-borne viral infection. AIMS To examine levels of anxiety among Scottish police staff following an occupational exposure to BBF. METHODS Police staff who reported an incident of exposure to their occupational health (OH) provider were invited to complete a postal questionnaire about their levels of self-reported anxiety after the incident and after contact with medical services (namely, OH and accident and emergency (A&E)). RESULTS Seventy exposed individuals (66% of those invited to take part) completed a questionnaire. Participants' self-reported anxiety after the incident varied widely. Levels of anxiety reduced over time and following contact with medical services. A&E staff were more likely to be the first point of medical contact for the most anxious individuals. Pre-incident training was not associated with post-incident anxiety. CONCLUSIONS The findings suggest that contact with medical services helps to alleviate post-exposure anxieties among police staff.
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Peltier WR, Drummond R, Roy K. Comment on “Ocean mass from GRACE and glacial isostatic adjustment” by D. P. Chambers et al. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2011jb008967] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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81
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Roy K, Mondal P, Bayen SP, Chowdhury P. Sonochemical Synthesis of Polypyrrole Salt and Study of its Cr(VI) Sorption-Desorption Properties. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2012. [DOI: 10.1080/10601325.2012.722852] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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82
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Roy K, O'Meara E, de Denus S, Blondeau L, Ducharme A, White M, Racine N, Liszkowski M, Sirois M, Lavoie J, Rouleau J, Dupuis J. 513 Elevated Osteopontin Levels in Patients With Chronic Heart Failure: Describing a Specific Physiopathologal Process. Can J Cardiol 2012. [DOI: 10.1016/j.cjca.2012.07.468] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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83
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Mondal P, Bayen SP, Roy K, Chowdhury P. Selective Solid Phase Extraction of Chromium(VI) using Silica Gel Immobilized 4-vinyl Pyridine/Cupric Ion Complex. SEP SCI TECHNOL 2012. [DOI: 10.1080/01496395.2012.686422] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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84
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Roy K, Mitra I. On the Use of the Metric rm 2 as an Effective Tool for Validation of QSAR Models in Computational Drug Design and Predictive Toxicology. Mini Rev Med Chem 2012; 12:491-504. [DOI: 10.2174/138955712800493861] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2010] [Revised: 02/12/2011] [Accepted: 02/13/2011] [Indexed: 11/22/2022]
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85
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Tomkins SE, Elford J, Nichols T, Aston J, Cliffe SJ, Roy K, Grime P, Ncube FM. Occupational transmission of hepatitis C in healthcare workers and factors associated with seroconversion: UK surveillance data. J Viral Hepat 2012; 19:199-204. [PMID: 22329374 DOI: 10.1111/j.1365-2893.2011.01543.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The study aims were to describe a case series of occupationally acquired hepatitis C (HCV) infections in UK healthcare workers and examine factors associated with transmission using exposure data reported to the Health Protection Agency between July 1997 and December 2007. Fifteen reported cases of documented HCV seroconversion occurred after percutaneous exposure, the majority from hollow-bore needles used in the source patient's vein or artery and contaminated with blood or blood-stained fluid. The seroconversion rate was 2.2% (14/626). In multivariable analysis of healthcare workers with percutaneous exposure to blood or blood-stained fluid, we demonstrate that blood sampling procedures (odds ratio [OR], 5.75; 95% CI, 1.33-24.91; P = 0.01) and depth of injury (OR for deep vs superficial injury, 21.99; 95% CI, 2.02-239.61; P = 0.02) are independently associated with a greater risk of HCV seroconversion. This is the first UK study of occupationally acquired HCV in healthcare workers. It has reinforced our knowledge of risk factors for HCV transmission. Most of these exposures and transmissions were preventable. Healthcare employers should provide regular education on the risks of occupational exposure and prevention through standard infection control procedures. They should ensure the availability of effective prevention measures and facilitate prompt reporting and adequate follow-up of exposures.
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Roy K, Das RN. QSTR with extended topochemical atom (ETA) indices. 15. Development of predictive models for toxicity of organic chemicals against fathead minnow using second-generation ETA indices. SAR AND QSAR IN ENVIRONMENTAL RESEARCH 2012; 23:125-140. [PMID: 22292780 DOI: 10.1080/1062936x.2011.645872] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Modern industrialisation has led to the production of millions of toxic chemicals having hazardous effects on the ecosystem. It is impracticable to determine the toxic potential of a large number of chemicals in animal models, making the use of quantitative structure-toxicity relationship (QSTR) models an alternative strategy for toxicity prediction. Recently we introduced a set of second-generation extended topochemical atom (ETA) indices for predictive modelling. Here we have developed predictive toxicity models on a large dataset of 459 diverse chemicals against fathead minnow (Pimephales promelas) using the second-generation ETA indices. These descriptors can be easily calculated from two-dimensional molecular representation without the need of time-consuming conformational analysis and alignment, making the developed models easily reproducible. Considering the importance of hydrophobicity for toxicity prediction, AlogP98 was used as an additional predictor in all the models, which were validated rigorously using multiple strategies. The ETA models were comparable in predictability to those involving various non-ETA topological parameters and those previously reported using various descriptors including computationally demanding quantum-chemical ones.
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Abstract
Aptamers are single-stranded structured oligonucleotides (DNA or RNA) that can bind to a wide range of targets ("apatopes") with high affinity and specificity. These nucleic acid ligands, generated from pools of random-sequence by an in vitro selection process referred to as systematic evolution of ligands by exponential enrichment (SELEX), have now been identified as excellent tools for chemical biology, therapeutic delivery, diagnosis, research, and monitoring therapy in real-time imaging. Today, aptamers represent an interesting class of modern Pharmaceuticals which with their low immunogenic potential mimic extend many of the properties of monoclonal antibodies in diagnostics, research, and therapeutics. More recently, chimeric aptamer approach employing many different possible types of chimerization strategies has generated more stable and efficient chimeric aptamers with aptamer-aptamer, aptamer-nonaptamer biomacromolecules (siRNAs, proteins) and aptamer-nanoparticle chimeras. These chimeric aptamers when conjugated with various biomacromolecules like locked nucleic acid (LNA) to potentiate their stability, biodistribution, and targeting efficiency, have facilitated the accurate targeting in preclinical trials. We developed LNA-aptamer (anti-nucleolin and EpCAM) complexes which were loaded in iron-saturated bovine lactofeerin (Fe-blf)-coated dopamine modified surface of superparamagnetic iron oxide (Fe3O4) nanoparticles (SPIONs). This complex was used to deliver the specific aptamers in tumor cells in a co-culture model of normal and cancer cells. This review focuses on the chimeric aptamers, currently in development that are likely to find future practical applications in concert with other therapeutic molecules and modalities.
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Roy K, Vinet A, Nadeau R, Kus T, Becker G, Jacquemet V, Leblanc A, Dube B, Sturmer M. 567 QT prolongation during ventricular stimulation is entirely dependent on QRS widening. Can J Cardiol 2011. [DOI: 10.1016/j.cjca.2011.07.471] [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] Open
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Roy K, Das RN. On some novel extended topochemical atom (ETA) parameters for effective encoding of chemical information and modelling of fundamental physicochemical properties. SAR AND QSAR IN ENVIRONMENTAL RESEARCH 2011; 22:451-472. [PMID: 21598192 DOI: 10.1080/1062936x.2011.569900] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Extended topochemical atom (ETA) indices developed by our group have been extensively applied in our previous reports for toxicity and ecotoxicity modelling in the field of quantitative structure-activity relationships (QSARs). In the present study these indices have been further explored by defining additional novel parameters to model n-octanol-water partition coefficient (two data sets; n = 168 and 139), water solubility (n = 193), molar refractivity (n = 166), and aromatic substituent constants π, MR, σ (m), and σ (p) (n = 99). All the models developed in the present study have undergone rigorous internal and external validation tests and the models have high statistical significance and prediction potential. In terms of Q² and r² values the models developed for the datasets of whole molecules are better than those previously reported, with topochemically arrived unique (TAU) indices on the same datasets of chemicals. An attempt has also been made to develop models using non-ETA topological and information indices. Interestingly, ETA and non-ETA models have been found to have similar predictive capacity.
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Roy K. Beyond the martial race theory: a historiographical assessment of recruitment in the British-Indian army. THE CALCUTTA HISTORICAL JOURNAL 2011; 21-22:139-154. [PMID: 21207878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
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91
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Kanwar JR, Mohan RR, Kanwar RK, Roy K, Bawa R. Applications of aptamers in nanodelivery systems in cancer, eye and inflammatory diseases. Nanomedicine (Lond) 2011; 5:1435-45. [PMID: 21128724 DOI: 10.2217/nnm.10.115] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Aptamers are an interesting class of molecules that have potential in many facets of human health. They are characterized by high affinity and specificity to their targets, are small in size, have similar properties to antibodies, but are made synthetically. All of these properties, among others, give aptamers the potential to diagnose, image and treat like no other molecules. By combining the unique properties of aptamers with the ever expanding field of nanotechnology and all it has to offer, we are entering a very promising new area of targeted nanodelivery treatments. These treatments have found success in the complex disease processes of cancer, eye and inflammatory diseases.
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Adhikari L, Roy K, Tsering DC, Pal R, Kar S. Susceptibility rates of pseudomonas aeruginosa strains to quinolones. J Lab Physicians 2011; 2:121. [PMID: 21346912 PMCID: PMC3040079 DOI: 10.4103/0974-2727.72217] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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93
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Mondal P, Roy K, Bayen S, Chowdhury P. Synthesis of polypyrrole nanoparticles and its grafting with silica gel for selective binding of chromium(VI). Talanta 2011; 83:1482-6. [DOI: 10.1016/j.talanta.2010.11.037] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2010] [Revised: 11/13/2010] [Accepted: 11/15/2010] [Indexed: 10/18/2022]
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Dunleavy K, Taylor A, Gow J, Cullen B, Roy K. Management of blood and body fluid exposures in police service staff. Occup Med (Lond) 2010; 60:540-5. [DOI: 10.1093/occmed/kqq111] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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95
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Chowdhury P, Mondal P, Roy K. Synthesis of polyaniline nanoparticle grafted silica gel and study of its Cr(VI) binding property. J Appl Polym Sci 2010. [DOI: 10.1002/app.32790] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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96
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Pandey R, Garg R, Roy K, Darlong V, Punj J, Kumar A. Perianesthetic management of the first robotic partial cystectomy in bladder pheochromocytoma. A case report. Minerva Anestesiol 2010; 76:294-7. [PMID: 20332744 DOI: pmid/20332744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The authors report the perianesthetic considerations of a rare case of pheochromocytoma of the urinary bladder for which the first reported robotic partial cystectomy and ureteric reimplantation were performed. A 59-year-old male patient, known to be hypertensive, was posted for transurethral resection of a bladder tumor. In the operation room, after attaching the monitors, a subarachnoid block was given. Upon manipulation of the tumor, the blood pressure and heart rate increased markedly. A pheochromocytoma was suspected and was later confirmed by raised urine catecholamine levels and meta-iodobenzyl-guanidine scan. The patient was started on tablet prazosin and atenolol. After optimization, a robotic partial cystectomy was planned. In the operating room, an epidural catheter and a radial artery cannula were inserted. After the induction of anesthesia and the securing of the airway, surgery was started. After the insertion of the verres needle, pneumoperitoneum was created very slowly, and then the patient was positioned in 40 degrees Trendelenburg. Surges in arterial blood pressure (ABP) were managed with titrated doses of sodium nitroprusside and nitroglycerine and boluses of esmolol and labetalol. ABP drops postoperatively were managed with fluid and dopamine infusion. Robotic surgery is a safe alternative to the open technique for pheochromocytoma of the urinary bladder. Care should be taken during the positioning of the patient for robot placement and during pneumoperitoneum creation.
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Kar S, Harding AP, Roy K, Popelier PLA. QSAR with quantum topological molecular similarity indices: toxicity of aromatic aldehydes to Tetrahymena pyriformis. SAR AND QSAR IN ENVIRONMENTAL RESEARCH 2010; 21:149-168. [PMID: 20373218 DOI: 10.1080/10629360903568697] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Extensive production and utilization of aromatic aldehydes and their derivatives without proper certification is alarming with regard to environmental safety. This concern motivated our construction of predictive quantitative structure-activity relationship (QSAR) models for the toxicity of aldehydes to the ecologically important species Tetrahymena pyriformis. Quantum topological molecular similarity (QTMS) descriptors, along with the lipid-water partition coefficient (log K(o/w)), were used as predictor variables. The QTMS descriptors were calculated at different levels of theory including AM1, HF/3-21G(d), HF/6-31G(d), B3LYP/6-31 + G(d,p), B3LYP/6-311 + G(2d,p) and MP2/6-311+G(2d,p). The data set of 77 aromatic aldehydes was divided into a training set (n = 58) and a test (n = 19) set, and 58 models were developed using partial least squares (PLS) and genetic partial least squares (G/PLS). We evaluated the overall predictive capacity of the models based on leave-one-out predictions for the training set compounds and model derived predictions for the test set compounds. For both PLS and G/PLS, the models built at the HF/6-31G(d) level show better predictivity (based on overall prediction) than the models developed at any of the other five levels. Further validation was also performed utilizing (process and model) randomization tests. We show that improved predictive QSAR models for aldehydic toxicity to Tetrahymena pyriformis can be generated using QTMS descriptors along with log K(o/w).
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Mohanraj P, Sharma J, Hari S, Kumar S, Roy K, Singh N. P200 CT scan findings in women with suspected tubo-ovarian masses. Int J Gynaecol Obstet 2009. [DOI: 10.1016/s0020-7292(09)61691-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Gupta P, Kumar S, Sharma R, Roy K, Malhotra N, Sharma J. O369 Role of MRI in fetal intra-abdominal cyst detected on prenatal sonography: Preliminary experience. Int J Gynaecol Obstet 2009. [DOI: 10.1016/s0020-7292(09)60741-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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100
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Sharma J, Kumar S, Roy K, Singh N, Batra S, Mittal S. V49 A Comparative study of TVT Obtape and Burch's colposuspension for urodynamic SUI. Int J Gynaecol Obstet 2009. [DOI: 10.1016/s0020-7292(09)61486-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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