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Sarkar N, Basu A. Instabilities and diffusion in a hydrodynamic model of a fluid membrane coupled to a thin active fluid layer. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2012; 35:115. [PMID: 23149567 DOI: 10.1140/epje/i2012-12115-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2011] [Accepted: 09/19/2012] [Indexed: 06/01/2023]
Abstract
We construct a coarse-grained effective two-dimensional (2d hydrodynamic theory as a theoretical model for a coupled system of a fluid membrane and a thin layer of a polar active fluid in its ordered state that is anchored to the membrane. We show that such a system is prone to generic instabilities through the interplay of nonequilibrium drive, polar order and membrane fluctuation. We use our model equations to calculate diffusion coefficients of an inclusion in the membrane and show that their values depend strongly on the system size, in contrast to their equilibrium values. Our work extends the work of S. Sankararaman and S. Ramaswamy (Phys. Rev. Lett., 102, 118107 (2009)) to a coupled system of a fluid membrane and an ordered active fluid layer. Our model is broadly inspired by and should be useful as a starting point for theoretical descriptions of the coupled dynamics of a cell membrane and a cortical actin layer anchored to it.
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Chatterjee M, Chakraborty B, Chatterjee SS, Bose M, Mukherjee K, Basu A, Das S, Banerjee M, Ghosh U. Enteric fever in an HIV/AIDS patient: Atypical manifestations. IRANIAN JOURNAL OF MICROBIOLOGY 2012; 4:150-2. [PMID: 23066491 PMCID: PMC3465542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Bloodstream infections with Salmonella typhi, is uncommon in human immunodeficiency virus (HIV)-infected persons. The symptoms in such patients are often non-specific and have a rather insidious onset and progression. We report a patient with sepsis and lower limb gangrene due to Salmonella typhi infection in an HIV-infected patient.
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Yu Y, Hanssen KF, Kalyanaraman V, Chirindel A, Jenkins AJ, Nankervis AJ, Torjesen PA, Scholz H, Henriksen T, Lorentzen B, Garg SK, Menard MK, Hammad SM, Scardo JA, Stanley JR, Wu M, Basu A, Aston CE, Lyons TJ. Reduced soluble receptor for advanced glycation end-products (sRAGE) scavenger capacity precedes pre-eclampsia in Type 1 diabetes. BJOG 2012; 119:1512-20. [PMID: 22900949 DOI: 10.1111/j.1471-0528.2012.03463.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVE Increased advanced glycation end-products (AGEs) and their soluble receptors (sRAGE) have been implicated in the pathogenesis of pre-eclampsia (PE). However, this association has not been elucidated in pregnancies complicated by diabetes. We aimed to investigate the serum levels of these factors in pregnant women with Type 1 diabetes mellitus (T1DM), a condition associated with a four-fold increase in PE. DESIGN Prospective study in women with T1DM at 12.2 ± 1.9, 21.6 ± 1.5 and 31.5 ± 1.7 weeks of gestation [mean ± standard deviation (SD); no overlap] before PE onset. SETTING Antenatal clinics. POPULATION Pregnant women with T1DM (n = 118; 26 developed PE) and healthy nondiabetic pregnant controls (n = 21). METHODS Maternal serum levels of sRAGE (total circulating pool), N(ε)-(carboxymethyl)lysine (CML), hydroimidazolone (methylglyoxal-modified proteins) and total AGEs were measured by immunoassays. MAIN OUTCOME MEASURES Serum sRAGE and AGEs in pregnant women with T1DM who subsequently developed PE (DM PE+) versus those who remained normotensive (DM PE-). RESULTS In DM PE+ versus DM PE-, sRAGE was significantly lower in the first and second trimesters, prior to the clinical manifestation of PE (P < 0.05). Further, reflecting the net sRAGE scavenger capacity, sRAGE:hydroimidazolone was significantly lower in the second trimester (P < 0.05) and sRAGE:AGE and sRAGE:CML tended to be lower in the first trimester (P < 0.1) in women with T1DM who subsequently developed PE versus those who did not. These conclusions persisted after adjusting for prandial status, glycated haemoglobin (HbA1c), duration of diabetes, parity and mean arterial pressure as covariates. CONCLUSIONS In the early stages of pregnancy, lower circulating sRAGE levels, and the ratio of sRAGE to AGEs, may be associated with the subsequent development of PE in women with T1DM.
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Basu A, Bhatti N, Lee BC. Pregnancy outcome in women with gestational diabetes: results of a four-year audit. PRACTICAL DIABETES 2012. [DOI: 10.1002/pdi.1699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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80
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Dong M, Parsaik AK, Eberhardt NL, Basu A, Cosio FG, Kudva YC. Cellular and physiological mechanisms of new-onset diabetes mellitus after solid organ transplantation. Diabet Med 2012; 29:e1-12. [PMID: 22364599 DOI: 10.1111/j.1464-5491.2012.03617.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
New-onset diabetes after transplantation is recognized as one of the metabolic consequences which may increase the risk of morbidity and mortality after solid organ transplantation. The pathophysiology of new-onset diabetes after transplantation has not been clearly defined and may resemble that of Type 2 diabetes, characterized by predominantly insulin resistance or defective insulin secretion, or both. This review aims to summarize the current state of knowledge regarding the prevalence, consequences, pathogenesis, and management of new-onset diabetes after transplantation, with a major focus on the possible mechanisms involved in the pathogenesis of the disorder. The aetiology of new-onset diabetes after transplantation is multifactorial, with diabetogenic immunosuppressive drugs playing a major role. Multiple cellular and physiologic mechanisms are involved in the process. Selection of an appropriate maintenance immunosuppressive regimen should involve balancing the risk of patient and graft survival vs. the potential for new-onset diabetes after transplantation.
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Badami KG, Sesun M, Basu A, Absalom N. Demographic, laboratory, and operational variables that influence short- and long-term plateletpheresis yields. J Clin Apher 2012; 27:247-54. [DOI: 10.1002/jca.21240] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2011] [Accepted: 05/30/2012] [Indexed: 11/08/2022]
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82
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Raut CG, Yadav PD, Towner JS, Amman BR, Erickson BR, Cannon DL, Sivaram A, Basu A, Nichol ST, Mishra AC, Mourya DT. Isolation of a novel adenovirus from Rousettus leschenaultii bats from India. Intervirology 2012; 55:488-90. [PMID: 22572722 DOI: 10.1159/000337026] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Accepted: 02/02/2012] [Indexed: 11/19/2022] Open
Abstract
Surveillance work was initiated to study the presence of highly infectious diseases like Ebola-Reston, Marburg, Nipah and other possible viruses that are known to be found in the bat species and responsible for causing diseases in humans. A novel adenovirus was isolated from a common species of fruit bat (Rousettus leschenaultii) captured in Maharashtra State, India. Partial sequence analysis of the DNA polymerase gene shows this isolate to be a newly recognized member of the genus Mastadenovirus (family Adenoviridae), approximately 20% divergent at the nucleotide level from Japanese BatAdV, its closest known relative.
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83
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Basu A, Basu S, Ghosh K, Mullick S, Datta S. PO-310 CLINICAL FEASIBILITY OF COBALT 60 HDR INTRACAVITARY BRACHYTHERAPY IN CARCINOMA CERVIX: A PRELIMINARY REPORT. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)72276-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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84
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Basu S, Basu A, Ghosh K, Datta S, Mullick S. PO-417 A PHASE I FEASIBILITY STUDY FOR HDR INTERSTITIAL BRACHYTHERAPY USING 60CO FOR DIFFERENT SITES. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)72383-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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85
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Brito JP, Singh E, Basu A. Iatrogenic heart block during treatment of a patient with Cushing's syndrome: report of a case. Endocrine 2012; 41:344. [PMID: 22124942 DOI: 10.1007/s12020-011-9567-x] [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: 11/27/2022]
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86
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Basu A, Horvath R, Esisi B, Birchall D, Chinnery PF. Recurrent stroke-like episodes in X-linked Charcot-Marie-Tooth disease. Neurology 2011; 77:1205-6. [PMID: 21900630 DOI: 10.1212/wnl.0b013e31822f046e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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87
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Ghosh A, Bera S, Ghosal S, Ray S, Basu A, Ray M. Differential inhibition/inactivation of mitochondrial complex I implicates its alteration in malignant cells. BIOCHEMISTRY (MOSCOW) 2011; 76:1051-60. [DOI: 10.1134/s0006297911090100] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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88
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Banerjee K, Basu A, Guin R, Sengupta D. Radon (222Rn) level variations on a regional scale from the Singhbhum Shear Zone, India: A comparative evaluation between influence of basement U-activity and porosity. Radiat Phys Chem Oxf Engl 1993 2011. [DOI: 10.1016/j.radphyschem.2010.12.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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89
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Werhwein EA, Mohamed EA, Curry TB, Basu A, Rizza RA, Basu R, Joyner MJ. Is blood pressure control in humans mediated by the peripheral chemoreceptors? FASEB J 2011. [DOI: 10.1096/fasebj.25.1_supplement.1076.3] [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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90
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Sarkar N, Basu A. Fluctuations and symmetries in two-dimensional active gels. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2011; 34:44. [PMID: 21533956 DOI: 10.1140/epje/i2011-11044-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2010] [Revised: 12/21/2010] [Indexed: 05/30/2023]
Abstract
Motivated by the unique physical properties of biological active matter, e.g., cytoskeletal dynamics in eukaryotic cells, we set up effective two-dimensional (2d) coarse-grained hydrodynamic equations for the dynamics of thin active gels with polar or nematic symmetries. We use the well-known three-dimensional (3d) descriptions (K. Kruse et al., Eur. Phys. J. E 16, 5 (2005); A. Basu et al., Eur. Phys. J. E 27, 149 (2008)) for thin active-gel samples confined between parallel plates with appropriate boundary conditions to derive the effective 2d constitutive relations between appropriate thermodynamic fluxes and generalised forces for small deviations from equilibrium. We consider three distinct cases, characterised by spatial symmetries and boundary conditions, and show how such considerations dictate the structure of the constitutive relations. We use these to study the linear instabilities, calculate the correlation functions and the diffusion constant of a small tagged particle, and elucidate their dependences on the activity or nonequilibrium drive.
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91
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Aston DE, Berven CA, Williams BC, Basu A. Mathematical analysis of effects on the electrostatic double layer of nanoscale surfaces in microfluidic channels. CAN J CHEM ENG 2011. [DOI: 10.1002/cjce.20475] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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92
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Mandal A, Huang W, Bhandari S, Basu A. Goodness-of-fit testing in growth curve models: A general approach based on finite differences. Comput Stat Data Anal 2011. [DOI: 10.1016/j.csda.2010.09.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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93
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Mandal A, Bhandari S, Basu A. Minimum disparity estimation based on combined disparities: Asymptotic results. J Stat Plan Inference 2011. [DOI: 10.1016/j.jspi.2010.07.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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94
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Basu A, Rahaman MS, Islam MR. Extension of the pore diffusion approach for modelling binary adsorption of lead and arsenic ions in a fixed-bed column packed with atlantic cod fish scales. CAN J CHEM ENG 2010. [DOI: 10.1002/cjce.20420] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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95
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Batal I, Lunz JG, Aggarwal N, Zeevi A, Sasatomi E, Basu A, Tan H, Shapiro R, Randhawa P. A critical appraisal of methods to grade transplant glomerulitis in renal allograft biopsies. Am J Transplant 2010; 10:2442-52. [PMID: 20977635 DOI: 10.1111/j.1600-6143.2010.03261.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Transplant glomerulitis is an increasingly recognized lesion in renal transplant biopsies. To develop a refined grading system, we defined glomerulitis by the presence of ≥5 leukocytes/glomerulus and evaluated 111 biopsies using three different grading systems: (i) percentage of glomerular involvement, (ii) peak inflammation in the most severely affected glomerulus and (iii) presence/absence of endocapillary occlusion by inflammatory cells. Endocapillary occlusion had no impact on graft survival, but was associated with increased serum creatinine, proteinuria and subsequent transplant glomerulopathy. Grading based on either percent or peak glomerular involvement correlated with graft failure and peritubular capillaritis. However, the percent glomerular involvement method had the additional advantage of displaying associations with: concurrent proteinuria, focal or diffuse immunoperoxidase peritubular capillary C4d staining, 1-year postbiopsy serum creatinine, subsequent detection of donor-specific antibody and development of transplant glomerulopathy. Patients with >75% glomerular involvement also revealed persistent high-grade glomerulitis on follow-up biopsies despite antirejection treatment. In conclusion, grading of glomerulitis is a meaningful exercise, and a quantification system based on percentage of glomerular involvement shows the most robust associations with clinical parameters and prognosis.
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Nordstrom KN, Verneuil E, Arratia PE, Basu A, Zhang Z, Yodh AG, Gollub JP, Durian DJ. Microfluidic rheology of soft colloids above and below jamming. PHYSICAL REVIEW LETTERS 2010; 105:175701. [PMID: 21231059 DOI: 10.1103/physrevlett.105.175701] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2010] [Indexed: 05/07/2023]
Abstract
The rheology near jamming of a suspension of soft colloidal spheres is studied using a custom microfluidic rheometer that provides the stress versus strain rate over many decades. We find non-Newtonian behavior below the jamming concentration and yield-stress behavior above it. The data may be collapsed onto two branches with critical scaling exponents that agree with expectations based on Hertzian contacts and viscous drag. These results support the conclusion that jamming is similar to a critical phase transition, but with interaction-dependent exponents.
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Basu A, Ramakrishnan S, Petre C, Koziol S, Brink S, Hasler PE. Neural dynamics in reconfigurable silicon. IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS 2010; 4:311-319. [PMID: 23853376 DOI: 10.1109/tbcas.2010.2055157] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A neuromorphic analog chip is presented that is capable of implementing massively parallel neural computations while retaining the programmability of digital systems. We show measurements from neurons with Hopf bifurcations and integrate and fire neurons, excitatory and inhibitory synapses, passive dendrite cables, coupled spiking neurons, and central pattern generators implemented on the chip. This chip provides a platform for not only simulating detailed neuron dynamics but also uses the same to interface with actual cells in applications such as a dynamic clamp. There are 28 computational analog blocks (CAB), each consisting of ion channels with tunable parameters, synapses, winner-take-all elements, current sources, transconductance amplifiers, and capacitors. There are four other CABs which have programmable bias generators. The programmability is achieved using floating gate transistors with on-chip programming control. The switch matrix for interconnecting the components in CABs also consists of floating-gate transistors. Emphasis is placed on replicating the detailed dynamics of computational neural models. Massive computational area efficiency is obtained by using the reconfigurable interconnect as synaptic weights, resulting in more than 50 000 possible 9-b accurate synapses in 9 mm(2).
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99
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Basu A, Mandal A, Pardo L. Hypothesis testing for two discrete populations based on the Hellinger distance. Stat Probab Lett 2010. [DOI: 10.1016/j.spl.2009.10.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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100
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Shapiro R, Lunz J, Zeevi A, Basu A, Mapara M, Randhawa P, Tan HP, Sharma V, Humar A. 1.7 year follow-up after bortezomib therapy for refractory antibody mediated rejection. CLINICAL TRANSPLANTS 2010:405-407. [PMID: 21696058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In summary, 1.7 years after transplantation, bortezomib rescue has been durably effective in salvaging our patient with refractory antibody mediated rejection. The only price has been persistently high levels of BK viruria. The presence of ongoing and even recurrent donor specific antibody has made it difficult to reduce immunosuppression further, and the concern that the high levels of BK viruria will eventually progress to viremia and nephropathy necessitates continued therapy with very low dose cidofovir and leflunomide. The absence of C1q binding DSA with stable renal function may provide some reserved optimism that the DSA that is detectable by convention Luminex assay may have reduced pathological implications. However, more data and prolonged follow-up are needed to determine whether or not non-complement binding DSA has an adverse pathological role.
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