Tamal Ghosh - Academia.edu (original) (raw)

Papers by Tamal Ghosh

Cornell University - arXiv, Dec 25, 2020

Electron Acoustic Solitary structures in Fermi Plasma with two temperature electrons have various... more Electron Acoustic Solitary structures in Fermi Plasma with two temperature electrons have various applications in space and laboratory-made plasma. Formulation of an adequate theory is important to understand various physical systems with various physical parameters. The motion of two temperature electrons in a quantum Fermi plasma system highly affects the solitary profile of the system. We study the quantum Fermi plasma system with two temperature electrons where the streaming velocities of the two-electron population are opposite. We consider the quantum hydrodynamic model (QHD) and derive a linear dispersion relation for the system. For the non-linear study of the system, we use the standard perturbation technique to derive KdV-B equation and show the evolution of a solitary profile with different plasma parameters. We analyze the stable Rouge wave structure using NLSE and show simulation results. We study the dynamical properties and phase plot for a two-stream quantum Fermi plasma system with two temperature electrons.

SSRN Electronic Journal, 2021

Plasma state of matter can be studied in various types of situations. These studies are of great ... more Plasma state of matter can be studied in various types of situations. These studies are of great interest in Astrophysical objects like galaxies, accretion disk, neutron stars, etc, and laboratory plasma as well. Different objects demand different approaches to investigate the dynamics of the plasma. The relativistic effects in the motion of electrons in Quantum Plasma highly affect the characteristics of the solitary structure of the wave with two-temperature electrons. In this paper, considering the quantum hydrodynamic (QHD) model a dispersion relation is derived, and using standard perturbation technique, a mathematical model (i.e. nonlinear Schrödinger Equation) is studied for a wave with relativistic and quantum effects in it. We study the analysis for different values of diffraction coefficient, streaming velocity, and other plasma parameters as well. We analyze the stable rogue wave structure using NLSE and run simulations of those solitary profiles and rogue waves.

Lecture Notes in Electrical Engineering, 2022

The International Journal of Advanced Manufacturing Technology, 2020

Optimization of the end milling process is a combinatorial task due to the involvement of a large... more Optimization of the end milling process is a combinatorial task due to the involvement of a large number of process variables and performance characteristics. Process-specific numerical models or mathematical functions are required for the evaluation of parametric combinations in order to improve the quality of the machined parts and machining time. This problem could be categorized as the offline data-driven optimization problem. For such problems, the surrogate or predictive models are useful, which could be employed to approximate the objective functions for the optimization algorithms. This paper presents a data-driven surrogate-assisted optimizer to model the end mill cutting of aluminum alloy on a desktop milling machine. To facilitate that, material removal rate (MRR), surface roughness (Ra), and cutting forces are considered as the functions of tool diameter, spindle speed, feed rate, and depth of cut. The principal methodology is developed using a Bayesian regularized neura...

Masking of data is a method to protect information by shielding it from a third party, however ke... more Masking of data is a method to protect information by shielding it from a third party, however keeping it usable for further usages like application development, building program extensions to name a few. Whereas it is possible for classical information encoded in composite quantum states to be completely masked from reduced subsystems , it has to be checked if quantum information can also be masked when the future possibilities of a quantum computer are increasing day by day. Newly proposed no-masking theorem [Phys. Rev. Lett. 120, 230501 (2018)], one of the no-go theorems, demands that except for some restricted sets of non-orthogonal states, it's impossible to mask arbitrary quantum states. Here, we explore the possibility of masking in the IBM quantum experience platform by designing the quantum circuits, and running them on the 5-qubit quantum computer. We choose two particular states considering both the orthogonal and non-orthogonal basis states and illustrate their masking through both the theoretical calculation as well as verification in the quantum computer. By quantum state tomography, it is concluded that the experimental results are collected with high fidelity and hence the possibility of masking is realized.

Masking of data is a method to protect information by shielding it from a third party, however ke... more Masking of data is a method to protect information by shielding it from a third party, however keeping it usable for further usages like application development, building program extensions to name a few. Whereas it is possible for classical information encoded in composite quantum states to be completely masked from reduced sub-systems, it has to be checked if quantum information can also be masked when the future possibilities of a quantum computer are increasing day by day. Newly proposed no-masking theorem [Phys. Rev. Lett. 120, 230501 (2018)], one of the no-go theorems, demands that except for some restricted sets of non-orthogonal states, it’s impossible to mask arbitrary quantum states. Here, we explore the possibility of masking in the IBM quantum experience platform by designing the quantum circuits, and running them on the 5-qubit quantum computer. We choose two particular states considering both the orthogonal and non-orthogonal basis states and illustrate their masking t...

Journal of Chemical Sciences, 2020

In this paper, synthesis, characterization and detection of CNby the compound (N 0 1E,N 0 2E)-N 0... more In this paper, synthesis, characterization and detection of CNby the compound (N 0 1E,N 0 2E)-N 0 1,N 0 2-bis((2-hydroxynaphthalen-1-yl)methylene)oxalohydrazide (1) have been reported. Compound 1 is synthesized by the reaction of oxalyldihydrazide and 2-hydroxy-1-naphthaldehyde and characterized by FTIR, 1 H NMR and ESI-Mass spectroscopy. UV-Visible spectral band of 1 is observed to be broadened and shifted to longer wavelength upon addition of CNion selectively in H 2 O-DMSO (8:2 v/v) medium. Based on the UV-Visible spectral data, the detection limit of cyanide ion for 1 is found to be 30.2 lM. Colourless solution of 1 changes to yellow in the presence of cyanide ion selectively. The same colour change is also observed on Whatman filter paper test strip. Fluorescence intensity of 1 is quenched due to the nucleophilic addition reaction of cyanide with one of the two imine carbons. 1 H NMR titration of 1 with CNion corroborates the reaction of the latter with one of the two imine carbons of the former, leading to the appearance of cyanomethyl proton signal at 6.15 ppm and consequently, its behaviour as chemodosimeter. The above mentioned chemodosimeter nature of 1 is also validated by ESI-Mass spectroscopy data. Compound 1 is capable for the detection of CNin water for real samples with concomitant colour change.

JOURNAL OF POLYMER MATERIALS, 2018

High blood pressure & cardiovascular prevention : the official journal of the Italian Society of Hypertension, 2018

Hypertension is a metabolic disease which is caused by vasoconstriction and that results into ele... more Hypertension is a metabolic disease which is caused by vasoconstriction and that results into elevated blood pressure. A chronic hypertensive condition affects and even damages to various systems in the body. Presence of renal cortexin (r-cortexin), an antihypertensive protein, which is released from the kidney cortex controls the blood pressure. The effect of r-cortexin was mediated through nitric oxide (NO), a universal vasodilating agent. In our study, acetyl salicylic acid (aspirin), a well-known activator of the endothelial nitric oxide synthase (eNOS) induced r-cortexin synthesis. The hypertensive rat model was prepared by injecting deoxy corticosterone acetate (DOCA). Synthesis of r-cortexin was measured by the anti-r-cortexin antibody which was raised in adult white Wister albino rat model. NO level was determined by using methemoglobin method and later confirmed by chemiluminescence method. Change in blood pressure was determined indirectly by using NIBP monitoring system. ...

Medicinal Chemistry, 2017

Both ovarian/breast cancers are the most prevalent hormone-associated gynecological-cancers, wher... more Both ovarian/breast cancers are the most prevalent hormone-associated gynecological-cancers, where uncontrolled cellular proliferations/genetic-errors are noticed. The cancer-antigen125 (CA125), which we assessed presently is an important biomarker in the early detection/monitoring of this disease-pathogenesis. Serum/tissue CA125 was measured by solid-phase-Enzyme-linked-immunosorbent-assay in women with ovarian/breast tumors of different types (epithelial/non-epithelial; benign/borderline/malignant)/stages. Breast-tumor tissues were employed for histoarchitecture/DNA-stability (comet) assay. Extensive protein-protein(CA125) interactions were studied by the STRING (Search-Tool-for-the-Retrieval-of-Interacting Genes/Proteins) Bioinformatics-software. Serum CA125 levels were <35 U/ml in 94% of benign epithelial-cases, 35-65 U/ml in 100% of borderline-tumors and >100 U/ml in the 41.17% of patients with malignant-tumors. The malignant epithelial tumor showed significantly higher (>100U/ml) CA125 than the non-epithelial malignant-tumor (<35-65 U/ml). Highly enhanced cellularity/histo-architectural impairment/unstable-DNA-materials/CA125 was found in advanced breast-cancers. The CA125 is highly metabolically interactive, especially with mesothelin impairing cell-cell adhesion and enhancing tissue anti-establishment. CA125 is a predictive-marker in ovarian/breast carcinoma depending on disease nature/stages. CA125, in combination with other tests like mesothelin/estradiol can be of great use in the better diagnosis of this disease. Not only as a detection-marker, has the CA125 played an interactive role in the disease processes. The Bioinformatics study revealed an important role of mesothelin and other mucin like proteins. Early detection and proper diagnosis are important determinants for the greater possibility of the relief from the disease like cancers. Selection of suitable biomarker combinations may increase the better diagnosis of the types and severity of this disease. Our present result has an impact on these aspects.

Inorganic chemistry, Jan 17, 2017

A new bis-heteroleptic Ru(II) complex based ditopic receptor, 1[PF6]2, having an anion binding tr... more A new bis-heteroleptic Ru(II) complex based ditopic receptor, 1[PF6]2, having an anion binding triazole -CH unit and appended 4-fluorophenyl urea arm has been developed. (1)H NMR and isothermal titration calorimetry (ITC) experiments showed binding of 1[PF6]2 toward oxyanions such as phosphates (e.g., H2PO4(-) and HP2O7(3-)) and carboxylates (e.g., CH3CO2(-) and C6H5CO2(-)) anions selectively. (1)H NMR studies showed that highly basic phosphate anions such as HP2O7(3-)/H2PO4(-) are bound by both -CH and -NH units of complex 1[PF6]2. However, comparatively less basic CH3CO2(-), C6H5CO2(-) anions interacted with the urea -NH protons only. Thermodynamic parameters obtained from ITC experiments suggested that binding of all the interacting anions with complex 1[PF6]2 are highly enthalpy and entropy driven processes. Importantly, complex 1[PF6]2 showed extraction of H2PO4(-), CH3CO2(-), and C6H5CO2(-) anions from aqueous solution via liquid-liquid extraction with efficiencies of 28%, 74%...

Organic & biomolecular chemistry, Jan 22, 2017

Photochemical N-formylation of amines was performed under simple and mild reaction conditions. Am... more Photochemical N-formylation of amines was performed under simple and mild reaction conditions. Amines are common electron donors in reductive photocatalysis, which then typically decompose after donating an electron to the photocatalyst. We have found that these oxidized amines can be utilized to give N-formamides in the presence of air without additional formylating agents. The reaction proceeds via the in situ formation of enamines. Oxygen (air) is necessary for the reaction to occur as it regenerates the photocatalyst forming superoxide radical anions as crucial intermediates involved in the reaction.

RSC Advances, 2016

An easy-to-prepare colorimetric and ON–OFF–ON fluorescent naphthol derivative1has been used for s... more An easy-to-prepare colorimetric and ON–OFF–ON fluorescent naphthol derivative1has been used for sequential detection of Cu2+and cysteine.

Central nervous system agents in medicinal chemistry, 2017

Chronic arsenic-exposure even at a low-dose results in the neural impairment and motor/cognitive ... more Chronic arsenic-exposure even at a low-dose results in the neural impairment and motor/cognitive dysfunction. However, several preventive approaches are made mainly against hepatic/gastrointestinal damages. Only a few investigations postulate therapeutic strategies for neural anomalies. Here, the protective role of Green tea (Camellia sinensis or CS; 10mg/ml aqueous) has been evaluated against arsenic-induced (0.6ppm/100g bw/28 days) cerebral/cerebellar tissue degeneration, oxidative-threats and neurotransmitter deregulation in female rats. The Dunnett's t test and multiple-comparison ANOVA-test suggest that arsenic significantly decreased free thiol level with an increase in lipid-peroxidised product and damages to the tissue-structure. A significant decrease in serum urate accompanied by increases in C-reactive protein and TNF-α, an acute-phase inflammatory cytokines strongly suggest a possible mechanism of oxidative-inflammatory tissue injury being supported by the increase i...

PLOS Neglected Tropical Diseases, 2017

Asymptomatic leishmaniasis may drive the epidemic and an important challenge to reach the goal of... more Asymptomatic leishmaniasis may drive the epidemic and an important challenge to reach the goal of joint Visceral Leishmaniasis (VL) elimination initiative taken by three Asian countries. The role of these asymptomatic carriers in disease transmission, prognosis at individual level and rate of transformation to symptomatic VL/Post Kala-azar Dermal Leishmaniasis (PKDL) needs to be evaluated. Asymptomatic cases were diagnosed by active mass survey in eight tribal villages by detecting antileishmanial antibody using rK39 based rapid diagnostic kits and followed up for three years to observe the pattern of sero-conversion and disease transformation. Out of 2890 total population, 2603 were screened. Antileishmanial antibody was detected in 185 individuals of them 96 had a history of VL/PKDL and 89 without such history. Seventy nine such individuals were classified as asymptomatic leishmaniasis and ten as active VL with a ratio of 7.9:1. Out of 79 asymptomatic cases 2 were lost to follow up as they moved to other places. Amongst asymptomatically infected persons, disease transformation in 8/77 (10.39%) and sero-conversion in 62/77 (80.52%) cases were noted. Seven (9.09%) remained sero-positive even after three years. Progression to clinical disease among asymptomatic individuals was taking place at any time up to three years after the baseline survey. If there are no VL /PKDL cases for two or more years, it does not mean that the area is free from leishmaniasis as symptomatic VL or PKDL may appear even after three years, if there are such asymptomatic cases. So, asymptomatic infected individuals need much attention for VL elimination programme that has been initiated by three adjoining endemic countries.

BMC Gastroenterology, 2002

Background: Helicobacter pylori (H. pylori) has been etiologically linked with primary gastric ly... more Background: Helicobacter pylori (H. pylori) has been etiologically linked with primary gastric lymphoma (PGL) and gastric carcinoma (GC). There are a few reports of occurrence of both diseases in the same patient with H. pylori infection. Case presentation: We report a patient with PGL in whom the tumor regressed after surgical resection combined with eradication of H. pylori infection. However, he developed GC on follow up; this was temporally associated with recrudescence / re-infection of H. pylori. This is perhaps first report of such occurrence. Conclusions: Possible cause and effect relationship between H. pylori infection and both PGL and GC is discussed. This case also documents a unique problem in management of PGL in tropical countries where re-infection with H. pylori is supposed to be high.

RSC Advances, 2015

This paper reports Self Assembled Monolayer (SAM) of propanethiol desorption assisted low tempera... more This paper reports Self Assembled Monolayer (SAM) of propanethiol desorption assisted low temperature, low pressure Cu–Cu thermo-compression bonding, a technique which could be applied to developing next generation heterogeneous smart devices.

Cornell University - arXiv, Dec 25, 2020

Electron Acoustic Solitary structures in Fermi Plasma with two temperature electrons have various... more Electron Acoustic Solitary structures in Fermi Plasma with two temperature electrons have various applications in space and laboratory-made plasma. Formulation of an adequate theory is important to understand various physical systems with various physical parameters. The motion of two temperature electrons in a quantum Fermi plasma system highly affects the solitary profile of the system. We study the quantum Fermi plasma system with two temperature electrons where the streaming velocities of the two-electron population are opposite. We consider the quantum hydrodynamic model (QHD) and derive a linear dispersion relation for the system. For the non-linear study of the system, we use the standard perturbation technique to derive KdV-B equation and show the evolution of a solitary profile with different plasma parameters. We analyze the stable Rouge wave structure using NLSE and show simulation results. We study the dynamical properties and phase plot for a two-stream quantum Fermi plasma system with two temperature electrons.

SSRN Electronic Journal, 2021

Plasma state of matter can be studied in various types of situations. These studies are of great ... more Plasma state of matter can be studied in various types of situations. These studies are of great interest in Astrophysical objects like galaxies, accretion disk, neutron stars, etc, and laboratory plasma as well. Different objects demand different approaches to investigate the dynamics of the plasma. The relativistic effects in the motion of electrons in Quantum Plasma highly affect the characteristics of the solitary structure of the wave with two-temperature electrons. In this paper, considering the quantum hydrodynamic (QHD) model a dispersion relation is derived, and using standard perturbation technique, a mathematical model (i.e. nonlinear Schrödinger Equation) is studied for a wave with relativistic and quantum effects in it. We study the analysis for different values of diffraction coefficient, streaming velocity, and other plasma parameters as well. We analyze the stable rogue wave structure using NLSE and run simulations of those solitary profiles and rogue waves.

Lecture Notes in Electrical Engineering, 2022

The International Journal of Advanced Manufacturing Technology, 2020

Optimization of the end milling process is a combinatorial task due to the involvement of a large... more Optimization of the end milling process is a combinatorial task due to the involvement of a large number of process variables and performance characteristics. Process-specific numerical models or mathematical functions are required for the evaluation of parametric combinations in order to improve the quality of the machined parts and machining time. This problem could be categorized as the offline data-driven optimization problem. For such problems, the surrogate or predictive models are useful, which could be employed to approximate the objective functions for the optimization algorithms. This paper presents a data-driven surrogate-assisted optimizer to model the end mill cutting of aluminum alloy on a desktop milling machine. To facilitate that, material removal rate (MRR), surface roughness (Ra), and cutting forces are considered as the functions of tool diameter, spindle speed, feed rate, and depth of cut. The principal methodology is developed using a Bayesian regularized neura...

Masking of data is a method to protect information by shielding it from a third party, however ke... more Masking of data is a method to protect information by shielding it from a third party, however keeping it usable for further usages like application development, building program extensions to name a few. Whereas it is possible for classical information encoded in composite quantum states to be completely masked from reduced subsystems , it has to be checked if quantum information can also be masked when the future possibilities of a quantum computer are increasing day by day. Newly proposed no-masking theorem [Phys. Rev. Lett. 120, 230501 (2018)], one of the no-go theorems, demands that except for some restricted sets of non-orthogonal states, it's impossible to mask arbitrary quantum states. Here, we explore the possibility of masking in the IBM quantum experience platform by designing the quantum circuits, and running them on the 5-qubit quantum computer. We choose two particular states considering both the orthogonal and non-orthogonal basis states and illustrate their masking through both the theoretical calculation as well as verification in the quantum computer. By quantum state tomography, it is concluded that the experimental results are collected with high fidelity and hence the possibility of masking is realized.

Masking of data is a method to protect information by shielding it from a third party, however ke... more Masking of data is a method to protect information by shielding it from a third party, however keeping it usable for further usages like application development, building program extensions to name a few. Whereas it is possible for classical information encoded in composite quantum states to be completely masked from reduced sub-systems, it has to be checked if quantum information can also be masked when the future possibilities of a quantum computer are increasing day by day. Newly proposed no-masking theorem [Phys. Rev. Lett. 120, 230501 (2018)], one of the no-go theorems, demands that except for some restricted sets of non-orthogonal states, it’s impossible to mask arbitrary quantum states. Here, we explore the possibility of masking in the IBM quantum experience platform by designing the quantum circuits, and running them on the 5-qubit quantum computer. We choose two particular states considering both the orthogonal and non-orthogonal basis states and illustrate their masking t...

Journal of Chemical Sciences, 2020

In this paper, synthesis, characterization and detection of CNby the compound (N 0 1E,N 0 2E)-N 0... more In this paper, synthesis, characterization and detection of CNby the compound (N 0 1E,N 0 2E)-N 0 1,N 0 2-bis((2-hydroxynaphthalen-1-yl)methylene)oxalohydrazide (1) have been reported. Compound 1 is synthesized by the reaction of oxalyldihydrazide and 2-hydroxy-1-naphthaldehyde and characterized by FTIR, 1 H NMR and ESI-Mass spectroscopy. UV-Visible spectral band of 1 is observed to be broadened and shifted to longer wavelength upon addition of CNion selectively in H 2 O-DMSO (8:2 v/v) medium. Based on the UV-Visible spectral data, the detection limit of cyanide ion for 1 is found to be 30.2 lM. Colourless solution of 1 changes to yellow in the presence of cyanide ion selectively. The same colour change is also observed on Whatman filter paper test strip. Fluorescence intensity of 1 is quenched due to the nucleophilic addition reaction of cyanide with one of the two imine carbons. 1 H NMR titration of 1 with CNion corroborates the reaction of the latter with one of the two imine carbons of the former, leading to the appearance of cyanomethyl proton signal at 6.15 ppm and consequently, its behaviour as chemodosimeter. The above mentioned chemodosimeter nature of 1 is also validated by ESI-Mass spectroscopy data. Compound 1 is capable for the detection of CNin water for real samples with concomitant colour change.

JOURNAL OF POLYMER MATERIALS, 2018

High blood pressure & cardiovascular prevention : the official journal of the Italian Society of Hypertension, 2018

Hypertension is a metabolic disease which is caused by vasoconstriction and that results into ele... more Hypertension is a metabolic disease which is caused by vasoconstriction and that results into elevated blood pressure. A chronic hypertensive condition affects and even damages to various systems in the body. Presence of renal cortexin (r-cortexin), an antihypertensive protein, which is released from the kidney cortex controls the blood pressure. The effect of r-cortexin was mediated through nitric oxide (NO), a universal vasodilating agent. In our study, acetyl salicylic acid (aspirin), a well-known activator of the endothelial nitric oxide synthase (eNOS) induced r-cortexin synthesis. The hypertensive rat model was prepared by injecting deoxy corticosterone acetate (DOCA). Synthesis of r-cortexin was measured by the anti-r-cortexin antibody which was raised in adult white Wister albino rat model. NO level was determined by using methemoglobin method and later confirmed by chemiluminescence method. Change in blood pressure was determined indirectly by using NIBP monitoring system. ...

Medicinal Chemistry, 2017

Both ovarian/breast cancers are the most prevalent hormone-associated gynecological-cancers, wher... more Both ovarian/breast cancers are the most prevalent hormone-associated gynecological-cancers, where uncontrolled cellular proliferations/genetic-errors are noticed. The cancer-antigen125 (CA125), which we assessed presently is an important biomarker in the early detection/monitoring of this disease-pathogenesis. Serum/tissue CA125 was measured by solid-phase-Enzyme-linked-immunosorbent-assay in women with ovarian/breast tumors of different types (epithelial/non-epithelial; benign/borderline/malignant)/stages. Breast-tumor tissues were employed for histoarchitecture/DNA-stability (comet) assay. Extensive protein-protein(CA125) interactions were studied by the STRING (Search-Tool-for-the-Retrieval-of-Interacting Genes/Proteins) Bioinformatics-software. Serum CA125 levels were <35 U/ml in 94% of benign epithelial-cases, 35-65 U/ml in 100% of borderline-tumors and >100 U/ml in the 41.17% of patients with malignant-tumors. The malignant epithelial tumor showed significantly higher (>100U/ml) CA125 than the non-epithelial malignant-tumor (<35-65 U/ml). Highly enhanced cellularity/histo-architectural impairment/unstable-DNA-materials/CA125 was found in advanced breast-cancers. The CA125 is highly metabolically interactive, especially with mesothelin impairing cell-cell adhesion and enhancing tissue anti-establishment. CA125 is a predictive-marker in ovarian/breast carcinoma depending on disease nature/stages. CA125, in combination with other tests like mesothelin/estradiol can be of great use in the better diagnosis of this disease. Not only as a detection-marker, has the CA125 played an interactive role in the disease processes. The Bioinformatics study revealed an important role of mesothelin and other mucin like proteins. Early detection and proper diagnosis are important determinants for the greater possibility of the relief from the disease like cancers. Selection of suitable biomarker combinations may increase the better diagnosis of the types and severity of this disease. Our present result has an impact on these aspects.

Inorganic chemistry, Jan 17, 2017

A new bis-heteroleptic Ru(II) complex based ditopic receptor, 1[PF6]2, having an anion binding tr... more A new bis-heteroleptic Ru(II) complex based ditopic receptor, 1[PF6]2, having an anion binding triazole -CH unit and appended 4-fluorophenyl urea arm has been developed. (1)H NMR and isothermal titration calorimetry (ITC) experiments showed binding of 1[PF6]2 toward oxyanions such as phosphates (e.g., H2PO4(-) and HP2O7(3-)) and carboxylates (e.g., CH3CO2(-) and C6H5CO2(-)) anions selectively. (1)H NMR studies showed that highly basic phosphate anions such as HP2O7(3-)/H2PO4(-) are bound by both -CH and -NH units of complex 1[PF6]2. However, comparatively less basic CH3CO2(-), C6H5CO2(-) anions interacted with the urea -NH protons only. Thermodynamic parameters obtained from ITC experiments suggested that binding of all the interacting anions with complex 1[PF6]2 are highly enthalpy and entropy driven processes. Importantly, complex 1[PF6]2 showed extraction of H2PO4(-), CH3CO2(-), and C6H5CO2(-) anions from aqueous solution via liquid-liquid extraction with efficiencies of 28%, 74%...

Organic & biomolecular chemistry, Jan 22, 2017

Photochemical N-formylation of amines was performed under simple and mild reaction conditions. Am... more Photochemical N-formylation of amines was performed under simple and mild reaction conditions. Amines are common electron donors in reductive photocatalysis, which then typically decompose after donating an electron to the photocatalyst. We have found that these oxidized amines can be utilized to give N-formamides in the presence of air without additional formylating agents. The reaction proceeds via the in situ formation of enamines. Oxygen (air) is necessary for the reaction to occur as it regenerates the photocatalyst forming superoxide radical anions as crucial intermediates involved in the reaction.

RSC Advances, 2016

An easy-to-prepare colorimetric and ON–OFF–ON fluorescent naphthol derivative1has been used for s... more An easy-to-prepare colorimetric and ON–OFF–ON fluorescent naphthol derivative1has been used for sequential detection of Cu2+and cysteine.

Central nervous system agents in medicinal chemistry, 2017

Chronic arsenic-exposure even at a low-dose results in the neural impairment and motor/cognitive ... more Chronic arsenic-exposure even at a low-dose results in the neural impairment and motor/cognitive dysfunction. However, several preventive approaches are made mainly against hepatic/gastrointestinal damages. Only a few investigations postulate therapeutic strategies for neural anomalies. Here, the protective role of Green tea (Camellia sinensis or CS; 10mg/ml aqueous) has been evaluated against arsenic-induced (0.6ppm/100g bw/28 days) cerebral/cerebellar tissue degeneration, oxidative-threats and neurotransmitter deregulation in female rats. The Dunnett's t test and multiple-comparison ANOVA-test suggest that arsenic significantly decreased free thiol level with an increase in lipid-peroxidised product and damages to the tissue-structure. A significant decrease in serum urate accompanied by increases in C-reactive protein and TNF-α, an acute-phase inflammatory cytokines strongly suggest a possible mechanism of oxidative-inflammatory tissue injury being supported by the increase i...

PLOS Neglected Tropical Diseases, 2017

Asymptomatic leishmaniasis may drive the epidemic and an important challenge to reach the goal of... more Asymptomatic leishmaniasis may drive the epidemic and an important challenge to reach the goal of joint Visceral Leishmaniasis (VL) elimination initiative taken by three Asian countries. The role of these asymptomatic carriers in disease transmission, prognosis at individual level and rate of transformation to symptomatic VL/Post Kala-azar Dermal Leishmaniasis (PKDL) needs to be evaluated. Asymptomatic cases were diagnosed by active mass survey in eight tribal villages by detecting antileishmanial antibody using rK39 based rapid diagnostic kits and followed up for three years to observe the pattern of sero-conversion and disease transformation. Out of 2890 total population, 2603 were screened. Antileishmanial antibody was detected in 185 individuals of them 96 had a history of VL/PKDL and 89 without such history. Seventy nine such individuals were classified as asymptomatic leishmaniasis and ten as active VL with a ratio of 7.9:1. Out of 79 asymptomatic cases 2 were lost to follow up as they moved to other places. Amongst asymptomatically infected persons, disease transformation in 8/77 (10.39%) and sero-conversion in 62/77 (80.52%) cases were noted. Seven (9.09%) remained sero-positive even after three years. Progression to clinical disease among asymptomatic individuals was taking place at any time up to three years after the baseline survey. If there are no VL /PKDL cases for two or more years, it does not mean that the area is free from leishmaniasis as symptomatic VL or PKDL may appear even after three years, if there are such asymptomatic cases. So, asymptomatic infected individuals need much attention for VL elimination programme that has been initiated by three adjoining endemic countries.

BMC Gastroenterology, 2002

Background: Helicobacter pylori (H. pylori) has been etiologically linked with primary gastric ly... more Background: Helicobacter pylori (H. pylori) has been etiologically linked with primary gastric lymphoma (PGL) and gastric carcinoma (GC). There are a few reports of occurrence of both diseases in the same patient with H. pylori infection. Case presentation: We report a patient with PGL in whom the tumor regressed after surgical resection combined with eradication of H. pylori infection. However, he developed GC on follow up; this was temporally associated with recrudescence / re-infection of H. pylori. This is perhaps first report of such occurrence. Conclusions: Possible cause and effect relationship between H. pylori infection and both PGL and GC is discussed. This case also documents a unique problem in management of PGL in tropical countries where re-infection with H. pylori is supposed to be high.

RSC Advances, 2015

This paper reports Self Assembled Monolayer (SAM) of propanethiol desorption assisted low tempera... more This paper reports Self Assembled Monolayer (SAM) of propanethiol desorption assisted low temperature, low pressure Cu–Cu thermo-compression bonding, a technique which could be applied to developing next generation heterogeneous smart devices.