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Nandi RP, Chandra B, Ghosh S, Sarma SP, Geremia S, Hickey N, Thilagar P. Pyrrole βC-B-N Fused Porphyrins: Molecular Structures and Opto-Electrochemical Studies. Chemistry 2024; 30:e202304219. [PMID: 38155424 DOI: 10.1002/chem.202304219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Accepted: 12/28/2023] [Indexed: 12/30/2023]
Abstract
Herein, we report the design, synthesis, structure, and electrochemical study of doubly βC-B-N fused Ni(II) porphyrins (1-trans, 1-cis, 2-trans, and 2-cis). These compounds have been synthesized from A2B2 type dipyridyl Ni(II) porphyrins (Ar=Ph for 1 a; Ar=C6F5 for 2 a) via Lewis base-directed electrophilic aromatic borylation reactions. The solution state structures of these compounds have been established using 1H NMR, 11B NMR, 1H-1H COSY, 1H-13C HSQC, and 19F-13C HSQC NMR techniques. Single crystal X-ray analysis have revealed that 1-trans, 1-cis, and 2-trans adopt ruffled conformations, with alternate meso-carbons on the opposite sides of the mean porphyrin plane. The Soret bands in the absorption spectra of the B-N fused molecules are ~40 nm redshifted compared to unfused Ni(II) porphyrin precursors. The B-N fusion have diminished the redox potential of fused porphyrins. Although 1-trans and 1-cis, show four oxidation processes, 2-trans and 2-cis show only three oxidation processes. DFT studies have revealed that the tetrahedral geometry of the boron has induced a twist in the π-conjugation, which destabilizes the HOMO and stabilizes the LUMO in 1-trans, 1-cis, 2-trans, and 2-cis.
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Alhussain H, Deepak , Chandra B, Lakshmi R, Sumana A, Jishamol K. EXAMINATION OF THE INCIDENCE OF POOR SLEEP QUALITY AND FACTORS ASSOCIATED FOR POOR SLEEP DURING THE VARIOUS PHASES OF PREGNANCIES. GEORGIAN MEDICAL NEWS 2024:47-53. [PMID: 38609113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/14/2024]
Abstract
Objective - to measure poor sleep quality, its components, and the variables that contribute to it in a cohort of pregnant women across time. Four hundred and eighty-six strong singleton pregnancies were collected ahead of the fourteenth gestational week. Data on poor sleep quality were gathered before pregnancy and analyzed five distinct times in each trimester and six months after delivery. "Poor sleep quality (PSQ) was defined as a score of fewer than eight on the Athens Insomnia Scale (AIS), and for each trimester, adjusted odds ratios (aOR) with 95% confidence intervals (CI)"were acquired by use of multivariate logistic regression analysis. Pregnancy prevalence of poor SQ was 6.1 percent, followed by 44.2 percent in the first trimester (TR1), 46.3 percent in the second trimester (TR2), and 63.7 percent in the third trimester (TR3). Poor sleep quality after pregnancy was reported by 33.2 percent of women "(28.2-37.9) (p<0.001 for pre-gestational versus TR1, TR2 vs. TR3, and TR3 vs. post-pregnancy)."Due to a decrease in the quality of their nocturnal sleep, TR3's mean AIS score went from 2.34 before pregnant to 9.87; in contrast, TR1's detrimental impact on daytime functioning was larger. Poor sleep during the previous trimester was linked to poor sleep in TR2 and TR3. Poor SQ during pregnancy was a factor in TR1's poor SQ, and obesity was linked to bad sleep in TR3. The risks of having poor sleep quality in TR3 were instead decreased by moderate physical activity. Poor sleep throughout pregnancy was shown to be much more common than good sleep at any point in the pregnancy. In the latter stages of pregnancy, two out of every three expecting moms suffer poor SQ. Particular attention should be paid to pre-gestational poor SQ prevention and high body mass index.
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Gond MK, Rai N, Chandra B, Gautam V, Garai S, Butcher RJ, Bharty MK. Isolation of potassium salt of oxadiazole-2-thione and in vitro anticancer activities of its Cu(II) and Zn(II) complexes against MDA-MB-231 human breast carcinoma cells. Dalton Trans 2023. [PMID: 37436037 DOI: 10.1039/d3dt01388j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/13/2023]
Abstract
A potassium 4-(pyridyl)-1,3,4-oxadiazole-2-thione was isolated in a basic medium, and its complexes [Cu(en)2(pot)2] (1) and [Zn(en)2(pot)2]HBr·CH3OH (2) containing ethylenediamine (en) as secondary ligand were synthesized and fully characterized. Upon changing the reaction conditions, the Cu(II) complex (1) adopts an octahedral geometry around the metal center. The cytotoxic activity of ligand (Kpot·H2O) along with complexes 1 and 2 was tested, and their anticancer activity against MDA-MB-231 human breast cancer cells was demonstrated, with complex 1 exhibiting superior cytotoxicity against these cells as compared to Kpot·H2O and complex 2. According to the DNA nicking assay, the ligand (Kpot·H2O) was found to be more potent to scavenge hydroxyl radicals even at a lower concentration (50 μg mL-1) than that of both complexes. The wound healing assay revealed that ligand Kpot·H2O and its complexes 1 and 2 attenuated the migration of the above-mentioned cell line. The loss of cellular and nuclear integrity and induction in the activity of Caspase-3 suggest the anticancer potential of ligand Kpot·H2O and its complexes 1 and 2 against MDA-MB-231 cells.
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Bhat IA, Soman R, Chandra B, Sahoo S, Thaltiri V, Panda PK. 10,15-Bis(ethoxycarbonyl)-5-(4-methoxycarbonylphenyl) B(III)subchlorin: A photosensitizer with high singlet oxygen producing efficiency. J PORPHYR PHTHALOCYA 2021. [DOI: 10.1142/s1088424621501005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A novel A2B-type B(III)subchlorin has been synthesized for the first time in two ways possessing two different ester moieties upon macrocyclic periphery from meso-diethoxycarbonyl tripyrrane. Its photophysical and electrochemical properties have been explored. Introduction of the third meso-substituent resulted in the synthesis of the B(III)subchlorin as the major product with the formation of minor oxidized B(III)subporphyrin analogue. This subchlorin derivative was found to generate singlet oxygen much efficiently with quantum yield ([Formula: see text] 0.88.
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Soman R, Chandra B, Bhat IA, Kumar BS, Hossain SS, Nandy S, Jose KVJ, Panda PK. A 2B- and A 3-Type Boron(III)Subchlorins Derived from meso-Diethoxycarbonyltripyrrane: Synthesis and Photophysical Exploration. J Org Chem 2021; 86:10280-10287. [PMID: 34264670 DOI: 10.1021/acs.joc.1c01001] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The first direct fabrication of A2B- and A3-type B(III)subchlorins from meso-ethoxycarbonyl-substituted tripyrrane has been realized by condensation with appropriate acid chlorides (benzoyl chloride, butyryl chloride, and ethyl chlorooxoacetate). The aliphatic acid chloride-based annulation reaction is new to subporphyrinoid chemistry. The phenyl (6a)- or n-propyl (6b)-substituted derivatives could be oxidized to the corresponding B(III)subporphyrins upon refluxing with DDQ, whereas the triethoxycarbonyl moiety (6c) was found to be resistant to oxidation and exhibits the most red-shifted absorption (587 nm) and emission (604 nm). The study indicates that absorption and emission behaviors of the B(III)subchlorin can be tuned by the introduction of electron-rich or electron-deficient substituents at the meso-position. B(III)subchlorins 6a and 6c generate singlet oxygen efficiently (44 and 40%, respectively) and, thus, may find application as potential photosensitizers in photodynamic therapy (PDT).
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Kumar BS, Chandra B, Jovan Jose KV, Panda PK. 1,2-Phenylene-Incorporated Smallest Expanded Calix[4]pyrrole via One-Step Synthesis of Tetrapyrrane: A Fluorescent Host for Fluoride Ion. J Org Chem 2021; 86:10536-10543. [PMID: 34319103 DOI: 10.1021/acs.joc.1c01179] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Synthesis of tetrapyrrane 8 from acetone and pyrrole via one-step condensation was achieved for the first time along with a much-improved yield of the tripyrrane 9. Diborylation of the tetrapyrrane and subsequent "1 + 1" cyclocoupling with 1,2-diiodobenzene following the Suzuki protocol generated novel o-phenylene incorporated macrocycle belonging to the smallest meso-expanded calix[4]pyrrole family. The latter macrocycle displays exclusive turn-on fluorescence sensing of fluoride ion upon complexation via a unique partial cone conformation supported by DFT analysis in acetonitrile solvent.
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Dutta R, Chandra B, Hong SJ, Park Y, Jung YM, Lee CH. Post Synthetic Modification of Planar Antiaromatic Hexaphyrin (1.0.1.0.1.0) by Regio-Selective, Sequential S NAr. Molecules 2021; 26:molecules26041025. [PMID: 33672044 PMCID: PMC7919474 DOI: 10.3390/molecules26041025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 02/07/2021] [Accepted: 02/09/2021] [Indexed: 11/17/2022] Open
Abstract
In spite of unique structural, spectroscopic and redox properties, the synthetic variants of the planar, antiaromatic hexaphyrin (1.0.1.0.1.0) derivatives 2, has been limited due to the low yields and difficulty in access to the starting material. A chemical modification of the meso-substituents could be good alternative overcoming the synthetic barrier. Herein, we report a regio-selective nucleophilic aromatic substitution (SNAr) of meso-pentafluorophenyl group in rosarrin 2 with catechol. The reaction afforded benzodioxane fused rosarrin 3 as single product with high yield. The intrinsic antiaromatic character of the starting rosarrin 2 retained throughout the reactions. Clean, two electron reduction was achieved by treatment of 3 with SnCl2•2H2O affording 26π-electron aromatic rosarrin 4. The synthesized compounds exhibited noticeable changes in photophysical and redox properties compared with starting rosarrin 2.
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Chandra B, Soman R, Sathish Kumar B, Jose KVJ, Panda PK. Meso-Free Boron(III)subchlorin and Its μ-Oxo Dimer with Interacting Chromophores. Org Lett 2020; 22:9735-9739. [PMID: 33270460 DOI: 10.1021/acs.orglett.0c03813] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Meso-free B(III)subchlorin 1 has been realized exclusively for the first time from meso-ethoxycarbonyl-substituted tripyrrane along with the first subchlorin dimer 2 as its μ-oxo analogue via a facile one-pot approach. The subchlorin is highly stable toward oxidation; hence, it was not contaminated with the corresponding subporphyrin analogue 3. The subchlorin (56%) and its dimer (30%) exhibit singlet oxygen generation ability for the first time. The B-O-B dimer displays strong exciton coupling between the two macrocycles.
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Samala S, Dutta R, He Q, Park Y, Chandra B, Lynch VM, Jung YM, Sessler JL, Lee CH. A robust bis-rhodium(i) complex of π-extended planar, anti-aromatic hexaphyrin[1.0.1.0.1.0]. Chem Commun (Camb) 2019; 56:758-761. [PMID: 31845684 DOI: 10.1039/c9cc09221h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
β,β'-Phenylene bridged hexaphyrin[1.0.1.0.1.0] (naphthorosarin), an expanded porphyrin possessing C3v-symmetry, has been shown to possess unique electronic features. We now report a bimetallic Rh(i)-complex of naphthorosarin retaining 24 π-antiaromatic characteristics. The two Rh(i) cations reside on opposite sides of the macrocyclic π-system and are separated at a distance consistent with a possible Rh(i)-Rh(i) metallic bond interaction.
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Saha S, Chandra B. Understanding the underlying motives and intention among Indian blood donors towards voluntary blood donation: A cross-sectional study. Transfus Clin Biol 2018; 25:109-117. [PMID: 29472138 DOI: 10.1016/j.tracli.2018.01.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Accepted: 01/24/2018] [Indexed: 11/19/2022]
Abstract
OBJECTIVES The present study aims to fill the gap in the literature by conducting a comprehensive research on Indian donor's intention towards voluntary blood donation in India. The study attempts to conceptualize and validate an integrative framework incorporating voluntary function inventory (VFI) in the theory of planned behaviour (TPB) model with the purpose tomeasure the voluntary blood donation intention. MATERIAL AND METHODS Structural equation modeling (SEM) has been used to rigorously test the hypothesized interrelationships among the underlying motives influencing voluntary blood donation intention. A self-administered questionnaire was used to collect data from a sample of respondents selected conveniently from selct locations in India. Total 450 completed questionnaires were received out of 1000 distributed. RESULTS The study develops a final conceptual framework that determines the drivers of blood donor's intention towards voluntary donation. The components of theory of planned behavior (TPB) model which include 'attitude', 'subjective norms' (SN), and 'perceived behavioral control' (PBC) along with modified volunteer functions namely 'value', 'social', 'career' and 'enhancement' were found significantly explaining the donation intention in the model. CONCLUSION The model achieves robustness with respect to predicting Indian donor's intention towards the voluntary donation of blood. The proposed model in this study advances the theory and research on thevolunteering motives towards blood donation. The study would provide a comprehensiveunderstanding of donors' intention to the practitioners, policy makers and Non-Government Organization (NGO), helping them to frame a calibrated strategydirected towards facilitating healthy blood donation practices.
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Pati NN, Kumar BS, Chandra B, Panda PK. Unsymmetrical Bipyrrole-Derived β-Tetraalkylporphycenes and C-H···Br-C Interaction Induced 2D Arrays of the 2:1 Supramolecular Sandwich Complex of Their cis
-/trans
-Dibromo Isomers. European J Org Chem 2017. [DOI: 10.1002/ejoc.201601584] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Chandra B, Mondal N, Kumar BS, Panda PK. New carbazole appended subporphyrin displaying intramolecular charge transfer and solid state fluorescence. J PORPHYR PHTHALOCYA 2016. [DOI: 10.1142/s1088424616500255] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A new subporphyrin namely, hydroxo-5,10,15-tri([Formula: see text]-propyl-3-carbazolyl)subporphyri natoboron(III) 6 has been synthesized via the reported litreture procedure by the condensation of pyridine-tri-[Formula: see text]-pyrrolylborane with 9-propyl-9H-carbazole-3-carbaldehyde. Its porphyrin analog [Formula: see text]. 5,10,15,20-tetra([Formula: see text]-propyl-3-carbazolyl)porphyrin has also been isolated from the reaction mixture, formed due to scrambling process and complexed with Zn(II). Photophysical properties of both subporphyrin and Zn(II)porphyrin have been studied in detail to confirm the intramolecular charge transfer process in subporphyrin analog. In addition, the ring contracted congener 6 also displays solid state fluorescence.
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Namboodiri C, Bongu S, Bisht P, Mukkamala R, Chandra B, Aidhen I, Kelly T, Costello J. Enhanced two photon absorption cross section and optical nonlinearity of a quasi-octupolar molecule. J Photochem Photobiol A Chem 2016. [DOI: 10.1016/j.jphotochem.2015.08.016] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Chandra B, Sathish Kumar B, Mondal N, Samanta A, Panda PK. Hexaethylsubporphyrins: β-alkyl analogues in the subporphyrin family. Dalton Trans 2015; 44:19966-73. [DOI: 10.1039/c5dt03864b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Two new subporphyrins were synthesized for the first time from a β-substituted pyrrole i.e. 3,4-diethylpyrrole via pyridine-tri-N-(3,4-diethylpyrrolyl)borane as building blocks.
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Pereira P, Kapoor A, Agarwal S, Pande S, Sinha A, Khanna R, Kumar S, Garg N, Tewari S, Majumdar G, Chandra B, Gupta N, Goel P. Do evidence practice gaps exist for medication prescription at hospital discharge in patients undergoing coronary artery bypass and coronary angioplasty. Indian Heart J 2014. [DOI: 10.1016/j.ihj.2014.10.331] [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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Gupta M, Chandra B, Gupta M. A framework of intelligent decision support system for Indian police. JOURNAL OF ENTERPRISE INFORMATION MANAGEMENT 2014. [DOI: 10.1108/jeim-10-2012-0073] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Purpose
– The purpose of this paper is to introduce architecture of an Intelligent Decision Support System to fulfill the emerging responsibilities of law enforcement agencies.
Design/methodology/approach
– The proposed Intelligent Police System (IPS) is designed to meet the emerging requirements and provide information at all levels of decision making by introducing a multi-level structure of user interface and crime analysis model. The proposed framework of IPS is based on data mining and performance measurement techniques to extract useful information like crime hot spots, predict crime trends and rank police administration units on the basis of crime prevention measures.
Findings
– IPS has been implemented on actual Indian crime data provided by National Crime Records Bureau (NCRB), which illustrates effectiveness and usefulness of the proposed system. IPS can play a vital role in improving outcome in the crime investigation, criminal detection and other major areas of functioning of police organization by analyzing the crime data and sharing of the information.
Research limitations/implications
– The research in intelligent police information system can be enhanced with some important additional features which include web-base management system, geographical information system, mobile adhoc network technology, etc.
Practical implications
– IPS can easily be applied to any police system in the world and can equally be useful for any law enforcement agencies for carrying out homeland security effectively.
Originality/value
– The research reported in this manuscript is outcome of the research project funded by NCRB. This paper is the first attempt to build framework of IPS for Indian police who deal with large volume and high rate of crimes that are unmatched to any police force of the world.
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Namboodiri C, Bisht P, Mukkamala R, Chandra B, Aidhen I. Solvatochromism, multiphoton fluorescence, and resonance energy transfer in a new octupolar dye-pair. Chem Phys 2013. [DOI: 10.1016/j.chemphys.2013.01.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Chandra B, Bhaskar S. A Novel Approach for Finding Frequent Itemsets in Data Stream. INT J INTELL SYST 2013. [DOI: 10.1002/int.21566] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Chandra B, Mahanta SP, Pati NN, Baskaran S, Kanaparthi RK, Sivasankar C, Panda PK. Calix[2]bispyrrolylarenes: New Expanded Calix[4]pyrroles for Fluorometric Sensing of Anions via Extended π-Conjugation. Org Lett 2012; 15:306-9. [DOI: 10.1021/ol3032158] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Chandra B, Litt LYL. 1.311 A NOVEL CASE OF RESTLESS LEG SYNDROME (RLS) DUE TO INTRACEREBRAL HAEMORRHAGE. Parkinsonism Relat Disord 2012. [DOI: 10.1016/s1353-8020(11)70369-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Chandra B, Gupta M. An efficient statistical feature selection approach for classification of gene expression data. J Biomed Inform 2011; 44:529-35. [PMID: 21241823 DOI: 10.1016/j.jbi.2011.01.001] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2010] [Revised: 11/16/2010] [Accepted: 01/03/2011] [Indexed: 10/18/2022]
Abstract
Classification of gene expression data plays a significant role in prediction and diagnosis of diseases. Gene expression data has a special characteristic that there is a mismatch in gene dimension as opposed to sample dimension. All genes do not contribute for efficient classification of samples. A robust feature selection algorithm is required to identify the important genes which help in classifying the samples efficiently. In order to select informative genes (features) based on relevance and redundancy characteristics, many feature selection algorithms have been introduced in the past. Most of the earlier algorithms require computationally expensive search strategy to find an optimal feature subset. Existing feature selection methods are also sensitive to the evaluation measures. The paper introduces a novel and efficient feature selection approach based on statistically defined effective range of features for every class termed as ERGS (Effective Range based Gene Selection). The basic principle behind ERGS is that higher weight is given to the feature that discriminates the classes clearly. Experimental results on well-known gene expression datasets illustrate the effectiveness of the proposed approach. Two popular classifiers viz. Nave Bayes Classifier (NBC) and Support Vector Machine (SVM) have been used for classification. The proposed feature selection algorithm can be helpful in ranking the genes and also is capable of identifying the most relevant genes responsible for diseases like leukemia, colon tumor, lung cancer, diffuse large B-cell lymphoma (DLBCL), prostate cancer.
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Tripathi BK, Chandra B, Singh M, Kalra PK. Complex generalized-mean neuron model and its applications. Appl Soft Comput 2011. [DOI: 10.1016/j.asoc.2009.12.038] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Deshpande VV, Chandra B, Caldwell R, Novikov DS, Hone J, Bockrath M. Mott Insulating State in Ultraclean Carbon Nanotubes. Science 2009; 323:106-10. [DOI: 10.1126/science.1165799] [Citation(s) in RCA: 142] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Chandra B, Shanker S, Mishra S. A new approach: Interrelated two-way clustering of gene expression data. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.stamet.2005.09.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Hone J, Kim P, Huang XMH, Chandra B, Caldwell R, Small J, Hong BH, Someya T, Huang L, O'Brien S, Nuckolls CP. Growth of nanotubes and chemical sensor applications. ACTA ACUST UNITED AC 2004. [DOI: 10.1117/12.571410] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Chandra B, Saxena G. A New Selection Measure for Classification Using Decision Trees. JOURNAL OF INFORMATION & KNOWLEDGE MANAGEMENT 2004. [DOI: 10.1142/s0219649204000626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The paper proposes a new selection measure for classification using decision trees for Data mining. Various algorithms have been proposed in the past for classification using decision trees viz. ID3, CART, SLIQ, etc. Selection measures like the Gain, Gain ratio, and Gini index have been proposed in these algorithms. However, none of the selection measures developed so far take into account the balancing of trees. This paper proposes a new selection measure which also takes into account the balancing of trees that will facilitate in improving the classification accuracy. The performance of the original SLIQ algorithm, C5 and the algorithm using the new selection measure (which takes into account the accuracy as well as the balance factor) was measured on the basis of the classification accuracy. Three real life data sets were chosen for this purpose.
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Ganesh Das G, Baisya RK, Chandra B. Aesthetic evolution and its infusion in consumer durable. JOURNAL OF ADVANCES IN MANAGEMENT RESEARCH 2003. [DOI: 10.1108/97279810380000360] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
This paper explores some aspects of aesthetics, its qualities and attributes in case of a consumer durable and the association of some attributes and quality with one another. Attempt is also made to understand the extent to which these play a role in designing a consumer durable. The attribute beauty, quality, feel and experience emerged important, whereas in the case of qualities of aesthetics beauty, order and symmetry, definitions, form proportion, finishing and unity of various parts emerged important. Amongst attributes, feel and experience has the highest association with other attributes of aesthetics. The correlation between qualities of aesthetics established that there is association between all the qualities of aesthetics, which confirms interrelationship with each other.
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Madria SK, Maheshwari S, Chandra B. Virtual partition algorithm in a nested transaction environment and its correctness. Inf Sci (N Y) 2001. [DOI: 10.1016/s0020-0255(01)00111-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Ikeda G, Isaji S, Chandra B, Watanabe M, Kawarada Y. Prognostic significance of biologic factors in squamous cell carcinoma of the esophagus. Cancer 1999. [PMID: 10526265 DOI: 10.1002/(sici)1097-0142(19991015)86:8<1396::aid-cncr3>3.0.co;2-h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
BACKGROUND Esophageal carcinoma is one of the most lethal tumors. Therefore, it is important to identify prognostic factors for patients with this disease. The objective of this study was to clarify the relation between clinicopathologic and biologic factors in esophageal carcinoma and to determine the prognostic significance of different biologic factors. METHODS DNA ploidy pattern, Ki-67 labeling index (LI), and cyclin D1 and p53 protein expression were examined and detailed pathologic examinations were conducted on tumors from 53 patients (46 males and 7 females with a mean age of 66 years [range, 47-85 years]) with surgically resected esophageal squamous cell carcinoma and the prognostic value of these factors was evaluated. RESULTS Of the 53 esophagus carcinomas examined, 26 (49%) were classified as DNA diploid. The mean Ki-67 LI was 45 +/- 4. 9% (range, 10.5-86.1%). p53 expression was detected in 38 of the carcinomas (71.7%) and cyclin D1 expression was detected in 35 (66%). Various prognostic factors were examined using the Cox stepwise regression model, four of which were found to correlate with overall survival: tumor size (P = 0.0346), lymph node status (P = 0.0384), Ki-67 LI (P = 0.0161), and p53 expression (P = 0.001). Lower Ki-67 LI and a lower rate of p53 expression were detected in the long term survival group (> 3 years) compared with the short term survival group (P = 0.00045 and P = 0.0023, respectively). CONCLUSIONS The biologic factors of Ki-67 LI and p53 expression, as well as clinicopathologic factors, may be used as independent prognostic factors for patients with esophageal carcinoma. However, the results of the current study do not support cyclin D1 expression as a prognostic factor.
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Pelant R, Chandra B, Pu J, Lohani M, Suknaphasawat N, Xu G. Small ruminants in development: the Heifer Project International experience in Asia. Small Rumin Res 1999. [DOI: 10.1016/s0921-4488(99)00077-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Ikeda G, Isaji S, Chandra B, Watanabe M, Kawarada Y. Prognostic significance of biologic factors in squamous cell carcinoma of the esophagus. Cancer 1999; 86:1396-405. [PMID: 10526265 DOI: 10.1002/(sici)1097-0142(19991015)86:8<1396::aid-cncr3>3.0.co;2-h] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND Esophageal carcinoma is one of the most lethal tumors. Therefore, it is important to identify prognostic factors for patients with this disease. The objective of this study was to clarify the relation between clinicopathologic and biologic factors in esophageal carcinoma and to determine the prognostic significance of different biologic factors. METHODS DNA ploidy pattern, Ki-67 labeling index (LI), and cyclin D1 and p53 protein expression were examined and detailed pathologic examinations were conducted on tumors from 53 patients (46 males and 7 females with a mean age of 66 years [range, 47-85 years]) with surgically resected esophageal squamous cell carcinoma and the prognostic value of these factors was evaluated. RESULTS Of the 53 esophagus carcinomas examined, 26 (49%) were classified as DNA diploid. The mean Ki-67 LI was 45 +/- 4. 9% (range, 10.5-86.1%). p53 expression was detected in 38 of the carcinomas (71.7%) and cyclin D1 expression was detected in 35 (66%). Various prognostic factors were examined using the Cox stepwise regression model, four of which were found to correlate with overall survival: tumor size (P = 0.0346), lymph node status (P = 0.0384), Ki-67 LI (P = 0.0161), and p53 expression (P = 0.001). Lower Ki-67 LI and a lower rate of p53 expression were detected in the long term survival group (> 3 years) compared with the short term survival group (P = 0.00045 and P = 0.0023, respectively). CONCLUSIONS The biologic factors of Ki-67 LI and p53 expression, as well as clinicopathologic factors, may be used as independent prognostic factors for patients with esophageal carcinoma. However, the results of the current study do not support cyclin D1 expression as a prognostic factor.
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Chandra B. A good pair of hands. Ann Intern Med 1999; 130:610-1. [PMID: 10189334 DOI: 10.7326/0003-4819-130-7-199904060-00024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Bhat R, Chandra B, Biswas K. Classification and Semantics of Objects and Relations of Object-Relation-Object Construct. JOURNAL OF INTELLIGENT SYSTEMS 1998. [DOI: 10.1515/jisys.1998.8.3-4.383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Abstract
Recent studies suggest that increased hepatic iron may impair the response to interferon therapy in patients with chronic hepatitis C. We reviewed the records and liver biopsies of 72 patients with chronic hepatitis C to determine the prevalence of iron overload and to evaluate whether there is a correlation between serum and hepatic iron concentrations and activity of liver disease. Patients with other causes of liver disease or iron overload were excluded. Necroinflammatory activity and fibrosis were evaluated using modified Knodell score. Hepatic iron was assessed using Brissot's grading system. Increased serum iron and ferritin levels were found in 29% and 43% patients, respectively. Hepatic iron grades 0, I, II, III, and IV were present in 37%, 35%, 25%, 3%, and 0% of patients, respectively. A significant correlation was found between hepatic iron grade and serum ferritin (P = .0001). There was no correlation between hepatic iron grade and histological activity index or fibrosis score. In summary, we found a high proportion of patients with chronic hepatitis C had mild to moderate increase in hepatic iron content even when patients with alcoholism and recurrent transfusions were excluded. However, very few patients had severely increased iron load.
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Venkataseshan VS, Chandra B, Graziano V, Steinlauf P, Marquet E, Irmiere V, Needle MA. Alkaptonuria and renal failure: a case report and review of the literature. Mod Pathol 1992; 5:464-71. [PMID: 1495952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
In alkaptonuric ochronosis, the absence of homogentisic acid oxidase results in the accumulation of homogentisic acid in the body. Associated renal failure is rare and usually occurs in the later stages of the disease. We report a 19-yr-old girl who presented initially with severe renal failure, without family or past history of illness. There was no significant proteinuria or hematuria. No clinical evidence of pigmentation such as skin and subcutaneous cartilages was noted. However, pigment deposits were identified in the renal biopsy specimens obtained within a week after admission and another after a month. Two months later the peritoneal dialysis fluid and skin progressively darkened, suggesting ochronosis. This was confirmed by the detection of homogentisic acid in the serum and urine. The patient expired in renal failure. Renal biopsy tissues showed diffuse chronic tubulo-interstitial disease characterized by widespread tubular atrophy, interstitial fibrosis, and a moderate degree of inflammation. Many tubular cells contained brown, coarsely granular ochronotic pigment (OP) and a few pigment casts were in the lumina. Similar deposits were also in the interstitium and within histiocytes. Ultrastructural studies of the glomeruli revealed small sparse OP deposits in the visceral and parietal epithelial cells, mesangial cells, and rare extracellular and basement membrane deposits. The tubulointerstitial changes were varied: atrophy and dilatation of tubules, varying degrees of lysosomal OP and degeneration of tubular cells, casts containing OP with crystalline material, histiocytes distended with OP, and free interstitial pigment deposition.(ABSTRACT TRUNCATED AT 250 WORDS)
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Chandra B. To john. J Child Adolesc Psychopharmacol 1992; 2:153. [PMID: 19630657 DOI: 10.1089/cap.1992.2.153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Abstract
A double-blind trial was done in 228 patients with one single seizure 2 weeks before coming to the author. One group was given sodium valproate, the other group placebo. The duration of therapy was 12 months. The results of this trial show that a person with a single seizure has epilepsy and should be treated with sodium valproate.
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Ott E, Chandra B, Hartmann A. Pentoxifylline alters the natural course of acute nonhemorrhagic stroke. Stroke 1990. [DOI: 10.1161/str.21.1.152a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Ott E, Chandra B, Hartmann A. Pentoxifylline alters the natural course of acute nonhemorrhagic stroke. Stroke 1990; 21:152. [PMID: 2300984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Szabo PP, Pradhan AS, Chandra B. Some dosimetric parameters of MgB 4O 7:Dy sintered pellets and CaSO 4:Dy Teflon discs-a comparative study. Phys Med Biol 1986. [DOI: 10.1088/0031-9155/31/1/508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Rohatgi JN, Chandra B. Amblyopia--its treatment with CAM stimulator. Indian J Ophthalmol 1984; 32:435-6. [PMID: 6545336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023] Open
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Rohatgi JN, Singh HK, Chandra B. Technique and indications for surgery of the inferior oblique muscle. Indian J Ophthalmol 1983; 31:361. [PMID: 6677589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
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Wahab S, Tandon RN, Jacob Z, Chandra B, Srivastava OP. Comparative in vitro and in vivo effect of lactones and arnebins on Trichophyton mentagrophytes and Candida albicans. Indian J Med Res 1982; 76 Suppl:77-82. [PMID: 6764457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
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