Author
Debasish Das
Bio: Debasish Das is an academic researcher from University of Calcutta. The author has contributed to research in topics: Dyeing & Coating. The author has an hindex of 7, co-authored 19 publications receiving 149 citations.
Topics: Dyeing, Coating, Carbon black, Curing (chemistry), Natural rubber
Papers
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TL;DR: In this article, a pad-dry-cure technique was used to modify a cotton fabric using acrylic acid as the finishing agent in the presence of K2S2O8 and NaH2PO4 catalysts separately or in selected combinations.
35 citations
TL;DR: In this paper, unique macro-structured carbon clusters are used to develop cost effective conductive cotton fabric and the lowest resistivity level achieved by this process is less than 60 ± 5.4 Ohm/cm2, which is very much promising for developing cost effective, waterproof, and breathable conductive fabric.
27 citations
TL;DR: Hyperhomocysteinemia was significantly associated with the wet AMD variety but not with the dry AMD, suggesting homocysteine by oxidative stress and vascular dysfunction can be an important risk factor in the pathogenesis of AMD.
Abstract: Introduction: Age-related macular degeneration (AMD) related to adverse vascular changes is the most frequent cause of irreversible visual impairment in the elderly. Elevated plasma concentrations of serum homocysteine have been shown to increase the risk of vascular disease. Objective: To assess the relationship between plasma homocysteine level and age related macular degeneration. Materials and methods: A case control study was conducted in a tertiary eye care hospital with 32 diagnosed AMD patients. The patients were compared for plasma homocysteine levels with a control group of 32 patients without AMD. A 1.5 ml of fasting venous blood sample was obtained from each participant. Plasma homocysteine level was measured by high performance liquid chromatography. The main outcome measure was hyperhomocysteinemia, defined as a plasma homocysteine level above 15 μmol/l. Results: Hyperhomocysteinemia was found in 10 blood samples (83.3 %) of patients in the wet AMD group, in 16 (80 %) blood samples in the dry AMD group, and in 12 blood samples (37%) of controls. The mean ± SD homocysteine level in the AMD group was 16.86 ± 3.52 μmol/L, while in the non-AMD control group it was 14.53 ± 4.08 μmol/L. This difference was statistically significant (p-value = 0.0186). In the individual analysis, it was also found out that the homocysteine level differed significantly between cases and controls in only the wet variety of AMD. Conclusion: Hyperhomocysteinemia was significantly associated with the wet AMD variety but not with the dry AMD. Thus, homocysteine by oxidative stress and vascular dysfunction can be an important risk factor in the pathogenesis of AMD. Nepal J Ophthalmol 2013; 5(10): 195-200 DOI: http://dx.doi.org/10.3126/nepjoph.v5i2.8728
20 citations
TL;DR: In this article, a pad-dry-cure technique was employed to control prior oxidation of the cellulosic and related chain molecules of jute to dialdehyde and related moieties with the help of aqueous NaIO4 then enhancing its copper number from 2.3 to 10-13.
17 citations
TL;DR: In this paper, a pad-dry-cure technique was used to modify cotton fabrics with hydrolysed sericin fraction of silk in the presence of trisodium citrate as the esterification catalyst.
Abstract: Cotton was modified with hydrolysed sericin fraction of silk in the presence of trisodium citrate as the esterification catalyst following a pad–dry–cure technique. The treatment of cotton fabric with 5% hydrolysed sericin in the presence of 7.5% catalyst followed by drying at 95°C for 5 min and curing at 140°C for 5 min produced optimum results with respect to exhaustion and fixation of reactive dyes having chlorotriaznyle and vinyl sulphone reactive groups when dyeing was accomplished in the absence of salt. Colour fastness to wash, light and rubbing of cotton for the application of reactive dyes remain unaltered for such prior modification with hydrolysed sericin. IR spectroscopy indicated the incorporation of amino acid residues of sericin fraction of silk in polymeric chains of cotton via establishment of ester linkages between carboxylic group of the amino acid moiety and hydroxyl groups of the cotton cellulose on pad–dry–cure.
17 citations
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TL;DR: This critical review is concerned with the recent advances in graft polymerisation techniques involving cellulose and its derivatives and highlights the recent developments in polymer synthesis that allow increased control over the grafting process and permit the production of functional celluloses that possess improved physical properties and chemical properties.
Abstract: This critical review is concerned with the recent advances in graft polymerisation techniques involving cellulose and its derivatives. It summarises some of the features of cellulose structure and cellulose reactivity. Also described are the various techniques for grafting synthetic polymers from the cellulosic substrate. In addition to the traditional grafting techniques, we highlight the recent developments in polymer synthesis that allow increased control over the grafting process and permit the production of functional celluloses that possess improved physical properties and chemical properties (189 references).
840 citations
TL;DR: Known risk factors and novel, potential biomarkers of AMD are discussed in addition to their application in both academic and clinical settings.
255 citations
TL;DR: It is speculated that a high level of homocysteine can be the sole reason or an aggravating factor in numerous diseases for which causal links are not fully understood.
Abstract: In the last 10 years, homocysteine has been regarded as a marker of cardiovascular disease and a definite risk factor for many other diseases. Homocysteine is biosynthesized from methionine through multiple steps and then goes through one of two major metabolic pathways: remethylation and transsulfuration. Hyperhomocysteinemia is a state in which too much homocysteine is present in the body. The main cause of hyperhomocysteinemia is a dysfunction of enzymes and cofactors associated with the process of homocysteine biosynthesis. Other causes include excessive methionine intake, certain diseases and side effects of some drugs. Hyperhomocysteinemia is a trigger for many diseases, such as atherosclerosis, congestive heart failure, age-related macular degeneration, Alzheimer’s disease and hearing loss. There are many studies showing a positive relationship between homocysteine level and various symptoms. We speculate that a high level of homocysteine can be the sole reason or an aggravating factor in numerous diseases for which causal links are not fully understood.
146 citations
TL;DR: In this paper, the effect of acrylic acid modification on the wetting and adsorption ability of carbon fiber (CF) in epoxy solution and the interfacial properties of CF/epoxy were investigated.
128 citations