This is Sourov Ghosh, from Jashore,Bangladesh.My primary school name is TKG school where i obtain GPA 5.I passed in my secandary level at Gpa 5. I also passed Hsc lavel in my village chollege.Now, I am student University of barisal, Bangladesh............................
Psoriatic arthritis (PsA) is a seronegative inflammatory arthritis that occurs concomitantly with... more Psoriatic arthritis (PsA) is a seronegative inflammatory arthritis that occurs concomitantly with cutaneous manifestations and tendinous pathology that affects up to 1% of the general population. While the majority of cases are mild, nearly 20% of PsA patients will progress to severe disease manifesting as debilitating polyarticular inflammation and joint destruction. PsA is most commonly asymmetric and bilateral severe disease involving the same joints in each hand has rarely been reported in the literature. It is estimated that PsA only presents bilaterally in a quarter of patients. The recent increase in popularity and efficacy of disease-modifying anti-rheumatic drugs (DMARDs) has led to increasing rarity of such severe disease progression. We present a case of a 47-year-old male with PsA who had a unique pattern of bilateral first metacarpophalangeal (MP) and interphalangeal (IP) involvement with minimal erosion leading to significant joint pain, instability, dislocation, and l...
English For International and Intercultural Communication Research Innovation and Employability Across Educational Curricula 1st International Conference 3 4 June 2011 Faculty of Arts University of Zaragoza 2011 Isbn 978 84 15 27420 9 Pags 105 106, 2011
Abstract An analytical method was developed for focused ion beam (FIB)/scanning electron microsco... more Abstract An analytical method was developed for focused ion beam (FIB)/scanning electron microscope (SEM) analysis of the microstructural pore properties of the catalyst layers in a polymer electrolyte membrane fuel cell (PEMFC). Generally, cross-sectional images of the catalyst layer obtained by FIB/SEM do not have uniform contrast in the pore area because carbons are often visible behind the cross-section, which makes conventional analysis inadequate. In the present study, by filling the pores of the catalyst layer with metalliferous epoxy polymer and using FIB/SEM, uniform contrast across the entire pore area was achieved without damage. The pore area was differentiated from the carbon network to produce a bi-segmented cross-sectional image. Subsequent digital image analysis revealed catalyst layer properties such as pore distribution and porosity at the microscopic level. The method was validated by comparing the porosity thus obtained from this method with that from mercury intrusion porosimetry measurements.
Excitation functions for the production of heavy residues through He reactions on Au targets have... more Excitation functions for the production of heavy residues through He reactions on Au targets have been measured in the incident energy range of 35 — 50 MeV which probes and extends the lower limits of the excitation functions for cluster and multi-nucleon emission. The older cross-section values that partially cover this energy region have been re-evaluated using more recent decay scheme data and compared with the present measurements. Interference from secondary neutrons in the cross-sections of interest were investigated.
Synthesis of carbon nanotube supported dendritic Pt-on-Pd nanoparticles and their composition-dep... more Synthesis of carbon nanotube supported dendritic Pt-on-Pd nanoparticles and their composition-dependent electrocatalytic performance towards oxygen reduction reaction are demonstrated.
Nanoscale Au particles are received with significant interest in the recent years owing to their ... more Nanoscale Au particles are received with significant interest in the recent years owing to their unique properties, which originate from the quantum scale dimension. Although colloidal Au has been known since ancient times for the decoration of glasses and for its curative powers, the technological importance has been understood only in the last two decades. The fascinating optical and electronic properties of the Au nanoparticles made them an excellent candidate in the development of nanoscale devices. Significant amount of research has been devoted to explore the technological application of these tiny particles. Various biosensing devices, catalytic interfaces and bioanalytical methodologies based on Au nanoparticles have been developed in the last two decades for different applications. Au nanoparticles are considered to be the key building blocks in the emerging nanoscale energy and sensing devices of 21(st) century. In this review, we highlight some of the recent patents and related literature on the bioanalytical applications of Au nanoparticles. A brief outline on the synthesis of Au nanoparticles of various size and shape and a detailed account of their potential utilization in the development of optical and electrochemical sensors/biosensors and analytical methods for drug delivery are discussed.
We describe the decoration of multiwalled carbon nanotubes (MCNTs) with Pt-Pd alloy nanoelectroca... more We describe the decoration of multiwalled carbon nanotubes (MCNTs) with Pt-Pd alloy nanoelectrocatalysts of three different compositions and their electrocatalytic performance toward the oxygen reduction reaction (ORR). The decoration of the MCNTs involves polymer-assisted impregnation of metal precursors PtCl(6)(2-) and PdCl(6)(2-) and the subsequent reduction of the impregnated precursors by a modified polyol route. The composition of the catalyst was controlled by tuning the molar ratio of the precursors during their impregnation. Electron probe microscopic analysis shows that the catalysts have compositions of Pt(46)Pd(54,) Pt(64)Pd(36) and Pt(28)Pd(72). The Pt(46)Pd(54) and Pt(64)Pd(36) catalysts have truncated octahedral and icosahedral shapes with a size ranging from 8 to 10 nm. On the other hand, the catalyst of Pt(28)Pd(72) composition has a spherical/quasispherical shape with a size distribution of 1-2 nm. The XPS measurement confirms the signature of metallic Pt and Pd. The Pt(46)Pd(54) catalyst has a pronounced electrocatalytic activity toward the ORR with a specific and mass activity of 378 μA cm(Pt-Pd)(-2) and 64 μA μg(Pt-Pd)(-1), respectively at 0.8 V. Moreover, the Pt(46)Pd(54) nanoelectrocatalyst is highly durable and it retains its initial catalytic activity even after 1000 extensive cycles. Interestingly, this catalyst has a very high tolerance toward methanol and it does not favor the oxidation of methanol in the potential window of 0.1-1.4 V. The electrocatalytic activity of the alloy electrocatalyst is compared with commercially available Pt black and MCNT-supported spherical Pt nanoparticles. The catalytic activity of the Pt(46)Pd(54) nanoelectrocatalyst is higher than the other catalysts. The Pt(46)Pd(54) catalyst outperforms the electrocatalytic activity of all other catalysts.
International Journal of Biological Macromolecules, 2021
AGL, a 15-kDa lectin from Amaranthus gangeticus seeds was isolated using ion-exchange and gel fil... more AGL, a 15-kDa lectin from Amaranthus gangeticus seeds was isolated using ion-exchange and gel filtration chromatography. AGL contained 8.55% of neutral sugar and became specifically inhibited by N-acetyl-D-galactosamine. Hemagglutination activity of the lectin was maximum over the pH range of 4.0-6.0 and temperatures of 30-60 °C though it lost the activity when treated with urea and EDTA. With an LC50 value of 250 μg/ml, AGL showed mild toxicity against Artemia nauplii. It inhibited the growth of pathogenic bacteria like Shigella boydii, Shigella dysenteriae and Staphylococcus aureus when treated for 8 and 16 h, respectively, but lost the antibacterial activity during a 24 h treatment. AGL could not inhibit the growth of Escherichia coli and mitogenic growth (7.0-9.0%) was observed instead. AGL inhibited 37.14%, 65.71% and 82.85% of biofilm formation of Escherichia coli at the concentrations of 250, 500 and 1000 μg/ml, respectively. Marked inhibition of the proliferation of Ehrlich ascites carcinoma cells was determined when treated with various doses of AGL. AGL inhibited 65.89% and 81.25% of the in vivo growth of EAC cells in mice at the doses of 2.0 and 4.0 mg/kg/day, respectively. Significant alteration of the expression of apoptosis related genes Fas, NF-kB and MAPK were observed.
Psoriatic arthritis (PsA) is a seronegative inflammatory arthritis that occurs concomitantly with... more Psoriatic arthritis (PsA) is a seronegative inflammatory arthritis that occurs concomitantly with cutaneous manifestations and tendinous pathology that affects up to 1% of the general population. While the majority of cases are mild, nearly 20% of PsA patients will progress to severe disease manifesting as debilitating polyarticular inflammation and joint destruction. PsA is most commonly asymmetric and bilateral severe disease involving the same joints in each hand has rarely been reported in the literature. It is estimated that PsA only presents bilaterally in a quarter of patients. The recent increase in popularity and efficacy of disease-modifying anti-rheumatic drugs (DMARDs) has led to increasing rarity of such severe disease progression. We present a case of a 47-year-old male with PsA who had a unique pattern of bilateral first metacarpophalangeal (MP) and interphalangeal (IP) involvement with minimal erosion leading to significant joint pain, instability, dislocation, and l...
English For International and Intercultural Communication Research Innovation and Employability Across Educational Curricula 1st International Conference 3 4 June 2011 Faculty of Arts University of Zaragoza 2011 Isbn 978 84 15 27420 9 Pags 105 106, 2011
Abstract An analytical method was developed for focused ion beam (FIB)/scanning electron microsco... more Abstract An analytical method was developed for focused ion beam (FIB)/scanning electron microscope (SEM) analysis of the microstructural pore properties of the catalyst layers in a polymer electrolyte membrane fuel cell (PEMFC). Generally, cross-sectional images of the catalyst layer obtained by FIB/SEM do not have uniform contrast in the pore area because carbons are often visible behind the cross-section, which makes conventional analysis inadequate. In the present study, by filling the pores of the catalyst layer with metalliferous epoxy polymer and using FIB/SEM, uniform contrast across the entire pore area was achieved without damage. The pore area was differentiated from the carbon network to produce a bi-segmented cross-sectional image. Subsequent digital image analysis revealed catalyst layer properties such as pore distribution and porosity at the microscopic level. The method was validated by comparing the porosity thus obtained from this method with that from mercury intrusion porosimetry measurements.
Excitation functions for the production of heavy residues through He reactions on Au targets have... more Excitation functions for the production of heavy residues through He reactions on Au targets have been measured in the incident energy range of 35 — 50 MeV which probes and extends the lower limits of the excitation functions for cluster and multi-nucleon emission. The older cross-section values that partially cover this energy region have been re-evaluated using more recent decay scheme data and compared with the present measurements. Interference from secondary neutrons in the cross-sections of interest were investigated.
Synthesis of carbon nanotube supported dendritic Pt-on-Pd nanoparticles and their composition-dep... more Synthesis of carbon nanotube supported dendritic Pt-on-Pd nanoparticles and their composition-dependent electrocatalytic performance towards oxygen reduction reaction are demonstrated.
Nanoscale Au particles are received with significant interest in the recent years owing to their ... more Nanoscale Au particles are received with significant interest in the recent years owing to their unique properties, which originate from the quantum scale dimension. Although colloidal Au has been known since ancient times for the decoration of glasses and for its curative powers, the technological importance has been understood only in the last two decades. The fascinating optical and electronic properties of the Au nanoparticles made them an excellent candidate in the development of nanoscale devices. Significant amount of research has been devoted to explore the technological application of these tiny particles. Various biosensing devices, catalytic interfaces and bioanalytical methodologies based on Au nanoparticles have been developed in the last two decades for different applications. Au nanoparticles are considered to be the key building blocks in the emerging nanoscale energy and sensing devices of 21(st) century. In this review, we highlight some of the recent patents and related literature on the bioanalytical applications of Au nanoparticles. A brief outline on the synthesis of Au nanoparticles of various size and shape and a detailed account of their potential utilization in the development of optical and electrochemical sensors/biosensors and analytical methods for drug delivery are discussed.
We describe the decoration of multiwalled carbon nanotubes (MCNTs) with Pt-Pd alloy nanoelectroca... more We describe the decoration of multiwalled carbon nanotubes (MCNTs) with Pt-Pd alloy nanoelectrocatalysts of three different compositions and their electrocatalytic performance toward the oxygen reduction reaction (ORR). The decoration of the MCNTs involves polymer-assisted impregnation of metal precursors PtCl(6)(2-) and PdCl(6)(2-) and the subsequent reduction of the impregnated precursors by a modified polyol route. The composition of the catalyst was controlled by tuning the molar ratio of the precursors during their impregnation. Electron probe microscopic analysis shows that the catalysts have compositions of Pt(46)Pd(54,) Pt(64)Pd(36) and Pt(28)Pd(72). The Pt(46)Pd(54) and Pt(64)Pd(36) catalysts have truncated octahedral and icosahedral shapes with a size ranging from 8 to 10 nm. On the other hand, the catalyst of Pt(28)Pd(72) composition has a spherical/quasispherical shape with a size distribution of 1-2 nm. The XPS measurement confirms the signature of metallic Pt and Pd. The Pt(46)Pd(54) catalyst has a pronounced electrocatalytic activity toward the ORR with a specific and mass activity of 378 μA cm(Pt-Pd)(-2) and 64 μA μg(Pt-Pd)(-1), respectively at 0.8 V. Moreover, the Pt(46)Pd(54) nanoelectrocatalyst is highly durable and it retains its initial catalytic activity even after 1000 extensive cycles. Interestingly, this catalyst has a very high tolerance toward methanol and it does not favor the oxidation of methanol in the potential window of 0.1-1.4 V. The electrocatalytic activity of the alloy electrocatalyst is compared with commercially available Pt black and MCNT-supported spherical Pt nanoparticles. The catalytic activity of the Pt(46)Pd(54) nanoelectrocatalyst is higher than the other catalysts. The Pt(46)Pd(54) catalyst outperforms the electrocatalytic activity of all other catalysts.
International Journal of Biological Macromolecules, 2021
AGL, a 15-kDa lectin from Amaranthus gangeticus seeds was isolated using ion-exchange and gel fil... more AGL, a 15-kDa lectin from Amaranthus gangeticus seeds was isolated using ion-exchange and gel filtration chromatography. AGL contained 8.55% of neutral sugar and became specifically inhibited by N-acetyl-D-galactosamine. Hemagglutination activity of the lectin was maximum over the pH range of 4.0-6.0 and temperatures of 30-60 °C though it lost the activity when treated with urea and EDTA. With an LC50 value of 250 μg/ml, AGL showed mild toxicity against Artemia nauplii. It inhibited the growth of pathogenic bacteria like Shigella boydii, Shigella dysenteriae and Staphylococcus aureus when treated for 8 and 16 h, respectively, but lost the antibacterial activity during a 24 h treatment. AGL could not inhibit the growth of Escherichia coli and mitogenic growth (7.0-9.0%) was observed instead. AGL inhibited 37.14%, 65.71% and 82.85% of biofilm formation of Escherichia coli at the concentrations of 250, 500 and 1000 μg/ml, respectively. Marked inhibition of the proliferation of Ehrlich ascites carcinoma cells was determined when treated with various doses of AGL. AGL inhibited 65.89% and 81.25% of the in vivo growth of EAC cells in mice at the doses of 2.0 and 4.0 mg/kg/day, respectively. Significant alteration of the expression of apoptosis related genes Fas, NF-kB and MAPK were observed.
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