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Nithyaprakash R, Shankar S, Naveenkumar R, Raja AJK, Anand RG, Abbas G, Prakash C, Pramanik A, Basak AK. Effect of Elevated Acetabular Cup on Contact and Failure Analysis in Hip Implants for Different Microseparations and Cup Inclinations Under Routine Gait Activities Using In Silico Approach. Indian J Orthop 2024; 58:705-715. [PMID: 38812869 PMCID: PMC11130114 DOI: 10.1007/s43465-024-01146-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Accepted: 03/29/2024] [Indexed: 05/31/2024]
Abstract
Objectives The acetabular cup design plays a critical role in reducing contact stress between femur head acetabular cup. Many studies used ellipsoidal and spheroidal geometry in acetabular cup design to effectively reduce contact stress. The present study focuses on elevated acetabular cup rim with round corner design to reduce contact stress with round corner geometry. Methods The cobalt chromium femur head and cup are considered for finite element (FE) model of hip resurfacing. The gait loads of routine activities of humans like normal walking, stair ascending and descending and sitting down and getting up gait activities are applied to the developed 3D FE model. Five microseparations of 0.5, 1, 1.5, 2 and 2.5 mm are considered in the present study. The acetabular cup inclination angle considered for this study are 35°, 45°, 55°, 65° and 75°. The contact stress and von Mises stress plot for each gait activities under these microseparations are analyzed for betterment of longevity of implants. Results Overall elevated cup rim design helped in reducing contact stress to a greater extent than conventional cup with different geometries. Also, the predicted von Mises stress for all the parameters considered in the current study are well within the yield strength of CoCr material. Therefore, elevated cup rim could be used as a better alternative to spline and, ellipsoidal and circular geometries of cup.
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Jain P, Shankar S, Thakur OP. Advancements in multiferroic, dielectric, and impedance properties of copper-yttrium co-doped cobalt ferrite for hydroelectric cell applications. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2024; 36:295201. [PMID: 38316037 DOI: 10.1088/1361-648x/ad266c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Accepted: 02/05/2024] [Indexed: 02/07/2024]
Abstract
This paper explores yttrium and copper co-doped cobalt ferrite [Co1-xCuxFe1.85Y0.15O4] synthesized via the sol-gel auto-combustion route (0.0 ⩽x⩽ 0.08). Investigating the impact of co-dopants on CoFe2O4, the study reveals altered cation distribution affecting the structure, multiferroic, and electrical properties. X-ray diffraction studies show nanocrystalline co-doped cobalt ferrites with lattice expansion and smaller grains due to Cu-Y co-doping. Fourier transform infrared spectroscopy confirms inverse spinel family classification with tetrahedral lattice shrinkage. Field emission scanning electron microscopy indicates a grain size of approximately 0.12μm. Ferroelectric analysis reveals a peak saturation polarization of 23.42μC cm-2for 8% copper doping, attributed to increased Fe3+ions at tetrahedral sites. Saturation magnetization peaks at 54.4706 emu g-1for 2% Cu2+ion substitution [Co0.98Cu0.02Fe1.85Y0.15O4] and decreases to 37.09 emu g-1for 4% Cu substitution due to irregular iron atom distribution at tetrahedral sites. Dielectric studies uncover Maxwell-Wagner polarization and high resistance in grain and grain boundaries using impedance spectroscopy. Fabricated hydroelectric cells exhibit improved ionic diffusion, suggesting their use in potential hydroelectric cell applications.
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SathiyaPriya S, Shavi GR, Sanga R, Shankar S, Gunasekaran L, Rahila C, Santhakumari S. Assessment of the prevalence of types of head and neck cancer in a tertiary cancer center at Madurai, Tamil Nadu: A cross-sectional study. J Cancer Res Ther 2024; 20:959-965. [PMID: 38261447 DOI: 10.4103/jcrt.jcrt_2081_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Accepted: 12/14/2022] [Indexed: 01/25/2024]
Abstract
AIM The aim of the study was to assess the prevalence of types of head and neck cancer in Madurai, Tamil Nadu. OBJECTIVES The objectives of the study were to assess the prevalence of types of head and neck cancer in Madurai, Tamil Nadu using a questionnaire. MATERIALS AND METHODS A descriptive cross-sectional study was carried out for two months among 300 head and neck cancer patients at a tertiary cancer center in Madurai. A convenience sampling technique was used. The data were collected using a pretested, self-structured questionnaire. The data were analyzed using the Statistical Package for the Social Sciences (SPSS) version 20.0 software. RESULTS Of 300 head and neck cancer patients, the mean age of the patients was about 51.04 ± 16.49 years. The majority of the patients were male (80%), employed (85%), and literate (65%). Among the head and neck cancer patients, 65% were tobacco users and 42.4% were alcohol consumers. Squamous cell carcinoma was the most common type of head and neck cancer, and 79.7% were diagnosed at an advanced stage of said cancer, such as stages III and IV. CONCLUSION Lack of knowledge and awareness is a major cause of increasing prevalence of head and neck cancer in our country. It is most important to increase the knowledge and awareness of early symptom recognition and its seriousness among the general population.
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Marín-Aguilera M, Jares P, Sanfeliu E, Villacampa G, Hernández-Lllán E, Martínez-Puchol AI, Shankar S, González-Farré B, Waks AG, Brasó-Maristany F, Pardo F, Manning DK, Abery JA, Curaba J, Moon L, Gordon O, Galván P, Wachirakantapong P, Castillo O, Nee CM, Blasco P, Senevirathne TH, Sirenko V, Martínez-Sáez O, Aguirre A, Krop IE, Li Z, Spellman P, Metzger Filho O, Polyak K, Michaels P, Puig-Butillé JA, Vivancos A, Matito J, Buckingham W, Perou CM, Villagrasa-González P, Prat A, Parker JS, Paré L. Analytical validation of HER2DX genomic test for early-stage HER2-positive breast cancer. ESMO Open 2024; 9:102903. [PMID: 38452436 PMCID: PMC10937240 DOI: 10.1016/j.esmoop.2024.102903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2023] [Revised: 02/01/2024] [Accepted: 02/02/2024] [Indexed: 03/09/2024] Open
Abstract
BACKGROUND HER2DX, a multianalyte genomic test, has been clinically validated to predict breast cancer recurrence risk (relapse risk score), the probability of achieving pathological complete response post-neoadjuvant therapy (pCR likelihood score), and individual ERBB2 messenger RNA (mRNA) expression levels in patients with early-stage human epidermal growth factor receptor 2 (HER2)-positive breast cancer. This study delves into the comprehensive analysis of HER2DX's analytical performance. MATERIALS AND METHODS Precision and reproducibility of HER2DX risk, pCR, and ERBB2 mRNA scores were assessed within and between laboratories using formalin-fixed paraffin-embedded (FFPE) tumor tissues and purified RNA. Robustness was appraised by analyzing the impact of tumor cell content and protocol variations including different instruments, reagent lots, and different RNA extraction kits. Variability was evaluated across intratumor biopsies and genomic platforms [RNA sequencing (RNAseq) versus nCounter], and according to protocol variations. RESULTS Precision analysis of 10 FFPE tumor samples yielded a maximal standard error of 0.94 across HER2DX scores (1-99 scale). High reproducibility of HER2DX scores across 29 FFPE tumors and 20 RNAs between laboratories was evident (correlation coefficients >0.98). The probability of identifying score differences >5 units was ≤5.2%. No significant variability emerged based on platform instruments, reagent lots, RNA extraction kits, or TagSet thaw/freeze cycles. Moreover, HER2DX displayed robustness at low tumor cell content (10%). Intratumor variability across 212 biopsies (106 tumors) was <4.0%. Concordance between HER2DX scores from 30 RNAs on RNAseq and nCounter platforms exceeded 90.0% (Cohen's κ coefficients >0.80). CONCLUSIONS The HER2DX assay is highly reproducible and robust for the quantification of recurrence risk, pCR likelihood, and ERBB2 mRNA expression in early-stage HER2-positive breast cancer.
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Jain P, Shankar S, Thakur OP. Unveiling the impact of Ni 2+/Y 3+ co-substitution on the structural, dielectric, and impedance properties of multiferroic spinel ferrite for hydroelectric cell application. Phys Chem Chem Phys 2023; 25:21280-21296. [PMID: 37551414 DOI: 10.1039/d3cp02339g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/09/2023]
Abstract
Substitution with rare earth (RE3+) and transition (X = Cu, Ni, Mn, Zn, etc.) metals can distort the spinel ferrite structure and create defects, which can be exploited in multifarious applications. In this study, yttrium and nickel co-substituted cobalt ferrites [Co1-xNixFe1.85Y0.15O4], (0.0 ≤ x ≤ 0.15) were synthesized by a modified sol-gel reaction route. The X-ray diffraction (XRD) patterns confirmed the single phase and highly crystalline nature of the prepared samples. Field emission scanning electron microscopy with energy dispersive X-ray (FESEM-EDX) spectroscopy confirmed the morphology of the prepared samples sintered at 800 °C and showed the grain sizes of the particles decreased with the addition of nickel ions. The simultaneous co-existence of saturation magnetization and ferroelectricity at room temperature confirmed the multiferroic nature of the co-substituted cobalt ferrites. The dielectric and impedance studies confirmed the Maxwell-Wagner polarization phenomenon and the enhanced values with Y-Ni co-substitution. The maximum saturation ferroelectric polarization was attained around 6.142 μC cm-2 for yttrium-substituted cobalt ferrite and then decreased with the increase in the substitution % of nickel. The maximum value of saturation magnetization (Ms = 99.50 emu g-1) was obtained with the highest substitution % of nickel of x = 0.15 in yttrium-substituted cobalt ferrite (YCFO) nanoferrites, which was also confirmed from the vibrating sample magnitude (VSM) studies at room temperature. The improvements in the structural, morphological, electrical, and multiferroic properties in the co-substituted cobalt ferrites were found to correlated to the substitution of the bigger cationic Y3+ ions compared to the Fe3+ ions, while the small substitution of Ni2+ ions lead to changes in the lattice parameters, porosity, and conduction behavior. These significant enhancements in co-substituted cobalt ferrites can be exploited for hydroelectric cell applications.
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Harding A, Pramanik A, Basak A, Prakash C, Shankar S. Application of additive manufacturing in the biomedical field- A review. ANNALS OF 3D PRINTED MEDICINE 2023. [DOI: 10.1016/j.stlm.2023.100110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023] Open
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Fadzil AFBA, Pramanik A, Basak A, Prakash C, Shankar S. Role of surface quality on biocompatibility of implants - A review. ANNALS OF 3D PRINTED MEDICINE 2022. [DOI: 10.1016/j.stlm.2022.100082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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Anadure R, Shankar S, Mohimen A, Pemmaraju A, Kalita J. An unusual case of eosinophilia, myalgia and skin contractures: Shulman's disease revisited. Med J Armed Forces India 2022; 78:S273-S276. [PMID: 36147388 PMCID: PMC9485746 DOI: 10.1016/j.mjafi.2019.12.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 12/29/2019] [Indexed: 10/24/2022] Open
Abstract
Shulman's disease (eosinophilic fasciitis) is a very rare autoimmune disorder with an unknown etiopathogenesis. During the initial period of disease, it usually causes limb and trunk edema followed by collagenous thickening of the subcutaneous fascia. Eosinophilia is a predominant laboratory finding during the initial phase of the disease and less prominent in the later phases. Patients may also present with arthritis, myositis, peripheral neuropathy, and rarely pleuropericarditis. Here, we are reporting a case of eosinophilic fasciitis presenting with vague constitutional symptoms, fever, and peripheral blood eosinophilia followed by rapidly evolving skin tightening with joint contractures and muscle stiffness, which misled the treating team toward Scleroderma and its overlap syndromes. The diagnosis was finally clinched by a full-thickness skin biopsy along with underlying fascia and muscle tissue from an effected area, with a gratifying treatment response to standard immune suppression.
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Weber SF, Ruby LC, Heller T, Hande M, Shastry BA, Acharya RV, Bhat R, Shankar S, Prabhu M, Mohapatra AK, Magazine R, Kadavigere R, Denkinger CM, Gehring S, Bélard S, Saravu K. TB disease patterns by HIV and diabetes status. Int J Tuberc Lung Dis 2022; 26:733-740. [PMID: 35898145 DOI: 10.5588/ijtld.21.0693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND: TB is commonly categorised as pulmonary (PTB) or extrapulmonary TB (EPTB). Knowledge of TB disease patterns (PTB and/or EPTB) and determining risk factors remains limited.METHODS: This was a prospective cohort study using point-of-care ultrasound (POCUS) in Indian patients with presumed TB. Clinical and imaging data were used to develop refined case definitions for PTB, concurrent PTB and EPTB (PTB + EPTB) and EPTB without PTB (EPTB). These groups were analysed by HIV (HIV+/-) and diabetes mellitus (DM+/-) status.RESULTS: Of 172 HIV-/DM- patients with TB, 48% had PTB, 23% PTB + EPTB and 29% had EPTB, totalling 52% with any EPTB (PTB + EPTB or EPTB). In HIV+/DM- patients with TB (n = 35), 6% had PTB, 40% had PTB + EPTB and 54% had EPTB, accounting for 94% with EPTB. In HIV-/DM+ patients with TB (n = 61), 61% had PTB, 28% had PTB + EPTB and 11% had EPTB, representing 39% with EPTB.CONCLUSION: Refined case definitions revealed high proportions of EPTB even without HIV or DM. HIV further altered the TB disease pattern towards EPTB and DM towards PTB. Therefore, the dichotomy between PTB or EPTB does not represent the actual spectrum of TB disease. EPTB should receive higher priority in research and clinical practice.
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Shankar S, R. N, K.A. S, K. P, Uddin M, Santhosh B. A Effect of Radial Clearance, Corner Radius and Micro Lateralization on Contact Stress of Metallic and Ceramic Hip Prosthesis. DEFENCE SCI J 2022. [DOI: 10.14429/dsj.72.16483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Edge loading leads to high contact stress at the rim of the contact. This is due to less radial clearance and excessive lateral head displacement which potentially causes implant failure. The ceramic implants have a high possibility of fracture compared with metallic implants because of above-said reasons. The present study focuses on the investigation of contact stress for the combined effect of radial clearance (0.05-0.75 mm) and micro-lateralisation conditions (1-2.5 mm) for Metal-on-Metal (M-o-M) and Ceramic-on-Ceramic (C-o-C) pairs. The contact stresses are analysed for round corners of the acetabulum cup geometry for the above-said combinations with four different arc radii (1- 4mm). Finite element modeling (FEM) of femur head with half of the acetabulum cup is considered for the current study. Contact stress values obtained for 2 mm and 4 mm round corner geometry are quite low when compared with 1 and 3 mm round corners even for larger radial clearances and high lateral head displacements. The study also showed von Mises stress value obtained for M-o-M pair is quite low for 4 mm round corner for larger radial clearance and high lateral head displacements. Similarly, in C-o-C pair the compressive stress values are minimum for 4 mm round corner. Since the stress values were minimum for 4 mm round corner geometry, it clearly indicates that even edge loading occurs and the round corner geometry would be very helpful in reducing the stress for both M-o-M and C-o-C pairs.
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Abbassi F, Gero D, Muller X, Bueno A, Figiel W, Robin F, Laroche S, Picard B, Shankar S, Ivanics T, van Reeven M, van Leeuwen OB, Braun HJ, Monbaliu D, Breton A, Vachharajani N, Bonaccorsi Riani E, Nowak G, McMillan RR, Abu-Gazala S, Nair A, Bruballa R, Paterno F, Weppler Sears D, Pinna AD, Guarrera JV, de Santibañes E, de Santibañes M, Hernandez-Aleja R, Olthoff K, Ghobrial RM, Ericzon BG, Ciccarelli O, Chapman WC, Mabrut JY, Pirenne J, Müllhaupt B, Ascher NL, Porte RJ, de Meier VE, Polak WG, Sapisochin G, Attia M, Weiss E, Adam RA, Cherqui D, Boudjema K, Zienewicz K, Jassem W, Puhan M, Dutkowski P, Clavien PA. Novel benchmark values for redo liver transplantation – does the outcome justify the effort? Br J Surg 2022. [DOI: 10.1093/bjs/znac178.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Abstract
Objective
In the era of organ shortage, redo liver transplantation (reLT) is frequently discussed in terms of expected poor outcome, high cost and therefore wasteful resources. However, there is a lack of benchmark data to reliably assess outcomes after reLT. The aim of this study was to define the ideal reLT case, and to establish clinically relevant benchmark values for best achievable outcome in reLT.
Methods
We collected data on reLT between January 2010 and December 2018 from 22 high volume transplant centers on three continents. Benchmark cases were defined as recipients with model of end-stage liver disease score <=25, absence of portal vein thrombosis, no mechanical ventilation before surgery, receiving a graft from a donor after brain death. In addition, early reLT including those for primary non-function (PNF) were excluded. Clinically relevant endpoints covering intra- and postoperative course were selected and complications were graded by severity using the Clavien-Dindo classification and the comprehensive complication index (CCI). The benchmark cutoff for each outcome was derived from the 75th percentile of the median values of all benchmark centers, indicating the “best achievable” result. To assess the utility of the newly established benchmark values, we analyzed patients who received reLT for PNF (non-benchmark patients).
Results
Out of 1110 reLT 413 (37.2%) qualified as benchmark cases. Benchmark values included: Length of intensive care unit and hospital stay: <=6 and <=24 days, respectively; Clavien-Dindo grade >=3a complications and the CCI at 1 year: <=76% and <=72.2, respectively; in-hospital and 1-year mortality rates: <=14.0% and <=14.3%, respectively. The cutoffs for transplant-specific complications such as biliary complications at 1 year, outflow problems at 1 year and hepatic artery thrombosis at discharge were <=27.3%, <=2.5% and <=4.8%, respectively. Patients receiving a reLT for PNF showed mean outcome values all outside the reLT benchmark values. In-hospital mortality rate was 34.4% and the mean CCI at discharge 68.8.
Conclusion
ReLT remains associated with high morbidity and mortality. The availability of benchmark values for outcome parameters of reLT may serve for comparison in any future analyses of individuals, patient groups, or centers, but also in the evaluation of new therapeutic strategies and principles.
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Krishna A, Ms A, Fernandes D, Ag H, Rao S, Shankar S, Banerjee S, Sunny J, Srinivas C, Lobo D. 9P A prospective study of gefitinib in patients with recurrent or metastatic cervical cancer. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.04.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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Krishna A, Ms A, Fernandes D, Ag H, Rao S, Shankar S, Banerjee S, Sunny J, Srinivas C, Lobo D. 14P A prospective study of comparision of two HDR brachytherapy regimens in treatment of cervical cancer. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.04.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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Shankar S, Logan A, Davis N, Baker L, Patel K. Outcomes in Single versus Standard Dose Basiliximab After Lung Transplant. J Heart Lung Transplant 2022. [DOI: 10.1016/j.healun.2022.01.292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Kundu S, Shankar S, Mitra S, Acharya S, Roy A, Dastidar AG. Below-Elbow and Below-Knee Metastases in Breast Cancer - A Case Report. Indian J Med Paediatr Oncol 2022. [DOI: 10.1055/s-0041-1733228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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Shankar S, Naveenkumar R, Nithyaprakash R, Narmatha S, Sai RR, Nandhakumar M. Impact of digital boards on hand and neck muscle activity during online teaching process. EDUCATION AND INFORMATION TECHNOLOGIES 2022; 27:5627-5640. [PMID: 35035258 PMCID: PMC8747848 DOI: 10.1007/s10639-021-10854-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/01/2021] [Accepted: 12/06/2021] [Indexed: 06/14/2023]
Abstract
Academicians across the globe due to Covid 19 shifted to online teaching as a mainstream method by replacing the chalk and talk method. The main objective of this study is to find the impact of different sizes of digital boards used for online teaching on muscle activity and muscle fatigue, and then results are compared with conventional writing. Initially, a questionnaire survey is conducted among 100 college professors about the issue they faced while using online teaching methods. Experimental analysis are then conducted using electromyography sensor (sEMG) among ten college professors and their muscle activity on the dominant hand and neck while writing on two commercially available digital boards namely Type 1 (small writing area) and Type 2 (large writing area). Four muscles namely Flexor carpi radialis, Extensor carpi radialis, Biceps brachii, and Sternocleidomastoid (SCM) are chosen for the study. The results are then compared with muscle activity while writing on conventional A4 sheets. Normalized root mean square (RMS) is used to assess the muscle activity and the trend line of MPF value is utilized to assess the muscle fatigue. The results show that SCM muscle has more muscle activation compared to other selected muscles followed by flexor carpi radialis. Subjective analysis is carried out using the Borg scale, which has reported that Type 2 digital board having larger working area was preferred by the participants as it reduces muscle fatigue.
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Shankar S, Bittner ZA, Weber ANR. NLRP3 Phospho-residue Mapping by Phospho Dot Blots. Methods Mol Biol 2022; 2459:93-103. [PMID: 35212958 DOI: 10.1007/978-1-0716-2144-8_10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
When characterizing posttranslational modifications like phosphorylation, using efficient screening methods to map the phospho sites is essential, especially when dealing with large multi-domain proteins. NLRP3 (the NOD, LRR, and pyrin domain-containing protein 3), which initiates the formation of an NLRP3 inflammasome complex, is regulated posttranslationally by phosphorylation at several Ser and Tyr residues. However, determining sites of modification are not straightforward. For quick and reliable screening of the candidate phospho sites in NLRP3, we use a phospho dot blot assay which we describe here. This technique employs an in vitro kinase assay with a candidate kinase, Bruton's Tyrosine Kinase (BTK), and peptides derived from the region of interest in the protein that contains the potential phosphorylation sites. The reaction containing the phosphorylated peptides is quickly screened by a dot blot where the peptides are blotted with a commercially available anti-phospho-tyrosine antibody. This method can also be adapted to detect modified Ser or Thr residues and is an ideal screening assay to map phospho residues in NLRP3 or other proteins. This can be an initial screening procedure or can be complemented by other approaches such as site directed mutagenesis and by generating phospho site-specific antibodies.
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Soumya SV, Arun L, Altaf S, Shankar S, Murali K, Panwar V. A comparison on efficiency and aerosol generation between “modified and conventional technique of bracket bonding”. J Pharm Bioallied Sci 2022; 14:S698-S701. [PMID: 36110685 PMCID: PMC9469375 DOI: 10.4103/jpbs.jpbs_868_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Accepted: 01/20/2022] [Indexed: 11/24/2022] Open
Abstract
Introduction: The novel COVID-19 which spread's primarily through oral and nasal passage poses a major threat of spread during dental treatments. It is important for dental practitioners to use minimal aerosol techniques. The aim of this study is to compare the time taken, efficiency and aerosol generated between modified and conventional technique (CT) of bracket bonding. Methods: This study includes 40 patients who required complete orthodontic treatment. In all 40 patients, one of the arches was bonded with modified technique (MT) and the opposing with CT. The time taken to prepare tooth in both the techniques were accessed. The efficiency of bond was seen over a period of 6 months. The amount of aerosol particulate matter generated during CT and MT was observed using a laser air quality monitor Conclusion: There is no significant difference in the bond failure and time taken between both the techniques. The aerosol generated in MT was minimal or almost negligible when compared to the use of CT.
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Aggarwal V, Shankar S, Suryakant, Manrai M, Vasdev V, Singhal A, Yadav AK. A young clinician's perspective on deprescribing in elderly patients: A pilot study. JOURNAL OF MARINE MEDICAL SOCIETY 2022. [DOI: 10.4103/jmms.jmms_38_20] [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] Open
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Ilyas Rahamathulla MM, Shankar S. Incidence of psychiatric illness among COVID-19-positive individuals with and without loss of smell or taste symptoms in a Tertiary Care Hospital in South India – A prospective cohort study. ANNALS OF INDIAN PSYCHIATRY 2022. [DOI: 10.4103/aip.aip_39_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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Bittner ZA, Liu X, Mateo Tortola M, Tapia-Abellán A, Shankar S, Andreeva L, Mangan M, Spalinger M, Kalbacher H, Düwell P, Lovotti M, Bosch K, Dickhöfer S, Marcu A, Stevanović S, Herster F, Cardona Gloria Y, Chang TH, Bork F, Greve CL, Löffler MW, Wolz OO, Schilling NA, Kümmerle-Deschner JB, Wagner S, Delor A, Grimbacher B, Hantschel O, Scharl M, Wu H, Latz E, Weber ANR. BTK operates a phospho-tyrosine switch to regulate NLRP3 inflammasome activity. J Exp Med 2021; 218:212658. [PMID: 34554188 PMCID: PMC8480672 DOI: 10.1084/jem.20201656] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Revised: 03/18/2021] [Accepted: 08/05/2021] [Indexed: 12/18/2022] Open
Abstract
Activity of the NLRP3 inflammasome, a critical mediator of inflammation, is controlled by accessory proteins, posttranslational modifications, cellular localization, and oligomerization. How these factors relate is unclear. We show that a well-established drug target, Bruton’s tyrosine kinase (BTK), affects several levels of NLRP3 regulation. BTK directly interacts with NLRP3 in immune cells and phosphorylates four conserved tyrosine residues upon inflammasome activation, in vitro and in vivo. Furthermore, BTK promotes NLRP3 relocalization, oligomerization, ASC polymerization, and full inflammasome assembly, probably by charge neutralization, upon modification of a polybasic linker known to direct NLRP3 Golgi association and inflammasome nucleation. As NLRP3 tyrosine modification by BTK also positively regulates IL-1β release, we propose BTK as a multifunctional positive regulator of NLRP3 regulation and BTK phosphorylation of NLRP3 as a novel and therapeutically tractable step in the control of inflammation.
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Shriram S, Nagaraj B, Jaya J, Shankar S, Ajay P. Deep Learning-Based Real-Time AI Virtual Mouse System Using Computer Vision to Avoid COVID-19 Spread. JOURNAL OF HEALTHCARE ENGINEERING 2021; 2021:8133076. [PMID: 34733459 PMCID: PMC8560261 DOI: 10.1155/2021/8133076] [Citation(s) in RCA: 79] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Revised: 09/13/2021] [Accepted: 09/23/2021] [Indexed: 11/30/2022]
Abstract
The mouse is one of the wonderful inventions of Human-Computer Interaction (HCI) technology. Currently, wireless mouse or a Bluetooth mouse still uses devices and is not free of devices completely since it uses a battery for power and a dongle to connect it to the PC. In the proposed AI virtual mouse system, this limitation can be overcome by employing webcam or a built-in camera for capturing of hand gestures and hand tip detection using computer vision. The algorithm used in the system makes use of the machine learning algorithm. Based on the hand gestures, the computer can be controlled virtually and can perform left click, right click, scrolling functions, and computer cursor function without the use of the physical mouse. The algorithm is based on deep learning for detecting the hands. Hence, the proposed system will avoid COVID-19 spread by eliminating the human intervention and dependency of devices to control the computer.
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Priya SS, Shavi GR, Sanga R, Shankar S, Lalithambigai G, Rahila C, Santhakumari S. Assessment of the perceived stress and burden of family caregivers of the head-and-neck cancer patients at a tertiary care cancer center: A cross-sectional study. J Cancer Res Ther 2021; 17:1039-1046. [PMID: 34528561 DOI: 10.4103/jcrt.jcrt_309_19] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Introduction Cancer is a major life-threatening disease and has an impact on both patients and their family members. Caring for cancer patients may lead to several levels of stress which may affect their own health as well as their quality of life. Aim To assess the perceived stress and burden of family caregivers of head and neck cancer patients (HNC) attending cancer care centre at a tertiary care centre, Tamil Nadu. Objectives To assess the perceived stress and the burden among caregivers of patients with head and neck cancer using the Perceived Stress Scale (PSS) and Caregiver Strain Index (CSI) respectively. Materials and Method A Cross-sectional study was carried out for a period of three months among the caregivers of head and neck cancer patients at a cancer care centre, Madurai. A total of 200 caregivers were selected by Convenience sampling method. Data was collected using a pretested, self-structured, closed-ended questionnaire by face to face interview method. Results The study population consisted of Caregivers aged 21-60 years, mostly females (80%), spouses (54%), employed (57%) and uneducated (66%). Most of the caregivers were from lower socioeconomic status (66%) and those who are providing care for 1 to 6 months were more in number. In this study, 82% of caregivers reported high caregiver burden (CSI ≥7) and 67% of caregivers reported high stress (PSS ≥ 26 - 40). Conclusion Caregivers are experiencing significant burden, particularly with respect to their physical and psychological well-being, economic circumstances, social and personal relationships.
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Singh S, Shankar S, . S. Evaluation of LDPE Degradation Under Controlled Composting. NATURE ENVIRONMENT AND POLLUTION TECHNOLOGY 2021. [DOI: 10.46488/nept.2021.v20i03.041] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The compost burial test was performed to determine the degradation of commercially available low-density polyethylene in natural compost for a period of six months. Biodegradability of polyethylene films in compost was monitored using scanning electron microscopy (SEM), Energy dispersive X-Ray, Fourier transform infrared spectroscopy (FTIR), X-Ray diffraction (XRD), thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC), and weight reduction analysis. After six months of compost exposure, a major change over the surface of LDPE was observed. SEM images clearly showed the exfoliation and cracks on the film leading to degradation. The other analysis also showed a change in the thermal properties and crystallinity of the LDPE films. The composting method could prove to be the reliable and ecological method of degrading plastic waste without hindering the natural ecosystem.
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Shobana G, Shankar S. A Convolutional Neural Network-Based Triplet-Mining Metric Learning Schema for Measuring Patient Similarity Addressing Personalized Healthcare. JOURNAL OF MEDICAL IMAGING AND HEALTH INFORMATICS 2021. [DOI: 10.1166/jmihi.2021.3471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Prediction of the development risk of some diseases is an important area of Health Care Research. When exploring the personalized care of the patients, precise identification and classification of similarity in patients from their past report is an important process. Electronically
stored health information EHRs that has been sampled unevenly as well as which has variable appointment durations, is considered to be unsuitable for measuring the similarity among patients directly, as there is no proper representation that are fitting. In addition, a technique is required
that is efficient to evaluate similarities in patient. We propose two new similarities learning environments using deep learning that learn simultaneously the representations of the patients as well as measurement of similarity in pairs. A Convolutional Neural Network (CNN) is used to understand
EHRs that contains crucial information which are local thereby providing scholastic illumination in the triplet loss otherwise entropy loss. When the training is completed, distances are calculated as well as similarities scores. Using this similarity information, disease predictions along
with patient grouping is performed. Experimentally the results gives an idea that CNN can represent the EHR sequences in a better way and the schema offered are more efficient than the modern metric distance learning.
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