Publications by authors named "Nandita Biswas"

Background: Buruli ulcer (BU) is a neglected tropical disease caused by Mycobacterium ulcerans that affects skin, soft tissues, and bones, causing long-term morbidity, stigma, and disability. The recommended treatment for BU requires 8 weeks of daily rifampicin and clarithromycin together with wound care, physiotherapy, and sometimes tissue grafting and surgery. Recovery can take up to 1 year, and it may pose an unbearable financial burden to the household.

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Background: Omphalitis is an important contributor to neonatal mortality in Kenya. Chlorhexidine digluconate 7.1 % w/w (CHX; equivalent to 4 % w/w chlorhexidine) was identified as a life-saving commodity for newborn cord care by the United Nations and is included on World Health Organization and Kenyan Essential Medicines Lists.

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Methanol can be employed as a green and sustainable methylating agent to form C-C and C-N bonds via borrowing hydrogen (BH) methodology. Herein we explored the activity of the acridine-derived SNS-Ru pincer for the activation of methanol to apply it as a C1 building block in different reactions. Our catalytic system shows great success toward the β-C(sp)-methylation reaction of 2-phenylethanols to provide good to excellent yields of the methylated products.

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A Ru-catalyzed acceptorless dehydrogenative multicomponent reaction has been developed. This reaction offers a cost-effective and simple operational strategy to synthesize biologically active 1,8-dioxodecahydroacridine derivatives. The protocol provides a wide range of substrate scope and various functional groups are also well tolerated under the reaction condition.

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The construction of C[double bond, length as m-dash]N bonds was achieved by the dehydrogenative coupling of alcohol and azide via aza-Wittig type reaction. The reaction is catalyzed by an acridine-derived ruthenium pincer complex and does not use any oxidant. The present protocol offers a wide substrate scope, including aliphatic, aryl or heteroaryl alcohol/azides.

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Article Synopsis
  • - This study examined the effects of daprodustat, a new oral medication for anemia in chronic kidney disease, focusing on its impact on hemoglobin levels and safety compared to traditional treatments like erythropoietin (rhEPO).
  • - Participants (216) on hemodialysis were switched from rhEPO to daprodustat at varying doses and their hemoglobin levels were monitored over 24 weeks, with initial results showing significant hemoglobin increases in the daprodustat group during the first 4 weeks.
  • - While both treatment groups showed similar hemoglobin levels after 24 weeks, daprodustat's safety profile was consistent with patients on hemodialysis, suggesting it could be a viable
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Article Synopsis
  • - The study evaluated the safety and effectiveness of daprodustat, a new oral medication, for treating anemia in patients with chronic kidney disease (CKD) not on dialysis over a 24-week period.
  • - In the trial involving 252 patients, those taking daprodustat achieved average hemoglobin levels similar to those receiving standard care with rhEPO, and maintained target hemoglobin levels better than the control group for a majority of the study period.
  • - Overall, daprodustat was found to be a viable option for managing anemia in CKD patients, showing effectiveness and a safety profile in line with expectations for this population.
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Introduction: Carcinoma cervix is a leading cause of cancer in India. However, majority of the patients face a problem of not being able to complete the treatment.

Aim: This study was an attempt to find out the important causes of this non-compliance to treatment in a rural Medical College Hospital where majority of the cancer cases are of cervical cancer.

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The complexes formed on the reaction of various metal ions viz., Cu(II) and Cu(I) with phenol derivatives viz. catechol, chlorogenic acid (CGA), hydroquinone and n-propyl gallate (nPG) were established by UV-visible spectroscopy.

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In this article, a simple method for either transfer of silver nanoparticles from formamide to chloroform or to form a film at their interface is demonstrated. The transfer of the particles is a two-step size-dependent process. The size distribution of the colloidal hydrophobic silver particles in chloroform was almost the same as that before its transfer.

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Structural and vibrational properties of mono- and multichromophoric hemicyanine (HC) dyes in solution and adsorbed on silver-coated films have been investigated using optical absorption and resonance Raman scattering techniques, with interpretations aided by theoretical calculations. This is the first report on the Raman spectroscopic studies of multichromophoric HC derivatives. The structure of the monomer, N-propyl-4-(p-N,N-dimethylamino styryl)pyridinium bromide (HC3), and its charged and neutral silver complexes (HC3-Ag) in the ground electronic (S(0)) state were optimized using density functional calculations with the B3LYP method using the 6-31G(*) and LANL2DZ basis sets.

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We demonstrate that dihydroxy benzenes are excellent reducing agents and may be used to reduce silver ions to synthesize stable silver nanoparticles in air-saturated aqueous solutions. The formation of Ag nanoparticles in deaerated aqueous solution at high pH values suggests that the reduction of silver ions occurs due to oxidation of dihydroxy benzenes and probably on the surface of Ag2O. Pulse radiolysis studies show that the semi-quinone radical does not participate in the reduction of silver ions at short time scales.

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Ascorbic acid monoglucoside (AsAG), a glucoside derivative of ascorbic acid, has been examined for its antioxidant and radioprotective abilities. AsAG neutralized 1, 1 diphenyl -2-picryl-hydrazyl (DPPH), a stable free radical in a concentration dependent manner thus indicating its antioxidant ability. AsAG protected mice liver tissues in vitro from peroxidative damage in lipids (measured as TBARS) resulting from 25Gy gamma irradiation.

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Background: Management of type 2 diabetes mellitus (DM) that involves uptitration of monotherapy to the maximum dose has been associated with delays in achieving glycemic control and an increased number of adverse events (AEs). Studies have reported the benefits of adding a thiazolidinedione to metformin (MET), but none has compared the effect of adding a thiazolidinedione to MET versus increasing the daily dose of MET to 3 g.

Objective: The goal of this study was to investigate the benefits of fixed-dose combination rosiglitazone and MET (RSG/MET) compared with high-dose MET monotherapy in patients with type 2 DM.

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An elevation in the ratio of proinsulin (PI) to immunoreactive insulin (IRI) is inversely related to beta-cell function in type 2 diabetes, and increased PI is an independent risk factor for coronary heart disease. An objective of the present studies was to assess the effects of the thiazolidinedione insulin sensitizer, rosiglitazone, on indirect markers of beta-cell function and cardiovascular risk in people with type 2 diabetes by measuring plasma PI and the PI:IRI ratio. Parameters of insulin processing, including plasma PI and PI:IRI ratios, were determined in type 2 diabetes patients enrolled in two randomized double-blind studies comparing the effects of rosiglitazone (4 or 8 mg/d) with placebo (study 1, 26-wk treatment) or the sulfonylurea glyburide (study 2, 52-wk treatment).

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This study evaluated the effects of rosiglitazone therapy on lipids and the efficacy and safety of rosiglitazone in combination with atorvastatin in patients with type 2 diabetes mellitus. Three-hundred thirty-two patients entered an 8-week, open-label, run-in treatment phase with rosiglitazone 8 mg/day, and 243 were randomized to a 16-week, double-blinded period of continued rosiglitazone plus placebo, atorvastatin 10 mg/day, or atorvastatin 20 mg/day. With rosiglitazone alone, a modest increase in low-density lipoprotein (LDL) cholesterol (9%), a shift in LDL phenotype from dense to large buoyant subfractions (52% of patients), and an increase in total high-density lipoprotein (HDL) cholesterol levels (6%), predominantly in HDL(2) levels (13%), occurred from week 0 to week 8.

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Objective: To investigate the effects of rosiglitazone (RSG) on insulin sensitivity and regional adiposity (including intrahepatic fat) in patients with type 2 diabetes.

Research Methods And Procedures: We examined the effect of RSG (8 mg/day, 2 divided doses) compared with placebo on insulin sensitivity and body composition in 33 type 2 diabetic patients. Measurements of insulin sensitivity (euglycemic hyperinsulinemic clamp), body fat (abdominal magnetic resonance imaging and DXA), and liver fat (magnetic resonance spectroscopy) were taken at baseline and repeated after 16 weeks of treatment.

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