Synthetic organic hard capsule colouring agents: in vitro effect on human true and pseudo-cholinesterases

Hard capsules are made of pure gelatin and small quantities of additives, including colouring agents permitted for use in food. In this study, the effects of three colouring agents (sunset yellow, quinoline yellow and erythrosine) on true and pseudo-cholinesterases (ChE) are assessed in erythrocytes and plasma, respectively. Results indicated that the synthetic compounds affected both true and pseudo ChE activity. The concentration of sunset yellow which caused 50% inhibition (IC50) of true ChE was about 64% that of pseudo-ChE; for erythrosine, IC50 was approximately the same for both true and pseudo-ChE; and for quinoline yellow, IC50 for true ChE was 25% of pseudo-ChE, although its effect on both true and pseudo-ChE was greater than seen with the other two dyes. Inhibitions of both true and pseudo-ChE were of mixed type (competitive and non-competitive). The enzyme-inhibitor dissociation constant (Ki) indicated that quinoline yellow was most potent and erythrosine was least potent out of the three compounds. Inhibition of both true and pseudo-ChE by each of the three dyes was abolished by dialysis, indicating that the effects were reversible.     

Ternary Copper Tungsten Sulfide (Cu2WS4) Nanoparticles Obtained through a Solvothermal Approach: A Bi-Functional Electrocatalyst for the Hydrogen Evolution Reaction (HER) and Oxygen Evolution Reaction (OER)

In this work, Cu₂WS₄ nanoparticles have been synthesized via a solvothermal decomposition approach using a heterobimetallic single source precursor, WCu₂S₄(PPh₃)₃. The single source precursor, WCu₂S₄(PPh₃)₃, has been characterized using multinuclear NMR spectroscopy, while Cu₂WS₄ nanoparticles have been characterized by powder X-ray diffraction (PXRD) for which Rietveld refinement has been performed to authenticate the lattice structure of the decomposed product, Cu₂WS₄. Furthermore, FESEM and EDAX analyses have been performed to assess the morphology and composition of Cu₂WS₄. An electrochemical study in acidic as well as basic media suggested that Cu₂WS₄ nanoparticles possess efficient bifunctional activity towards electrochemical hydrogen as well as oxygen evolution reactions. Linear sweep voltammetry (LSV) performed in 0.5 N H₂SO₄ indicates an onset potential for the HER of 462 mV and a Tafel slope of 140 mV dec⁻¹. While LSV performed in 0.1 M KOH indicates an onset potential for the OER of 190 mV and a Tafel Slope of 117 mV dec⁻¹.     

Role of Antiischemic Agents in the Management of Non‐ST Elevation Acute Coronary Syndrome (NSTE‐ACS)

Non‐ST elevation acute coronary syndrome (NSTE‐ACS) is the commonest acute presentation of coronary artery disease (CAD). Mortality and morbidity of the condition has improved substantially over the last few decades as a result of the cumulative effect of multiple interventions acting via different mechanisms. Despite a significant increase in the rate of coronary intervention, medical therapy continues to retain a central role in the treatment of NSTE‐ACS particularly in frail patients where revascularization is inappropriate or when it is incomplete. Several antiischemic agents have been used in the treatment of the condition. Beta blockers are often the first‐line choice with calcium channel blockers and nitrates being used as an alternative when beta blockers are contraindicated, or as an addition to achieve optimal symptom control. Newer agents, such as nicorandil, ivabradine, and ranolazine have also been used in refractory cases. Although most of these agents have been extensively studied in large randomized controlled trials in patients with stable CAD or ST elevation acute coronary syndrome (STE‐ACS), the evidence supporting their use in NSTE‐ACS is less clear cut. In this article, we review various drugs available for controlling ischemia and the latest evidence in support of their use in NSTE‐ACS.     

Details of coronary stenosis morphology influence its hemodynamic severity and distal flow reserve

Differences in coronary flow reserve with anatomically similar coronary artery stenoses have been attributed to 1) nonstandard physiologic conditions, 2) inadequacies of measurements of coronary artery stenosis dimension and/or coronary blood flow, and 3) inadequate hyperemic stimulus. Our study tested the hypothesis that details of coronary artery stenosis geometry, which may or may not be apparent on coronary angiograms, also may contribute importantly to such differences. A simple and complex coronary artery stenosis, each of which reduced vessel cross-sectional area by 84%, was introduced in random order into the left anterior descending coronary artery of nine closed-chest, sedated swine. The simple stenosis had a single lumen while the complex stenosis had five small lumena whose combined area equaled that of the single lumen stenosis. Measurements of hemodynamics and regional myocardial blood flow (microspheres) were made at control and after 10 minutes of adenosine infused at 400 micrograms/min and then at 800 micrograms/min distal to each stenosis. Both heart rate and aortic mean pressure were controlled and thus did not change versus initial baseline (129 +/- 4 minutes and 120 +/- 10 mm Hg, mean +/- SD, respectively) during the study. Baseline total flow (ml/sec) distal to the stenosis was similar at each control (1.05 +/- 0.35 vs. 0.92 +/- 0.34, simple versus complex, respectively; p = NS). At maximal adenosine, total flow with the simple stenosis was 3.44 +/- 0.92 versus 2.77 +/- 0.51 for complex (p less than 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)     

Rumination,Social Problem Solving and Suicide Intent Among Egyptians With a Recent Suicide Attempt

The more complex influences of social problem-solving abilities and rumination—specifically brooding and reflection—on suicide intent is not well understood. We hypothesized that social problem solving would moderate the association between reflection and suicide intent, and mediate the influence of brooding on suicide intent. A convenience sample (N = 186) of individuals hospitalized for recent suicide attempt was interviewed, assessing suicide intent, social problem solving, brooding, reflection and depression. Brooding and reflection were positively associated with suicide intent. The mediating, but not the moderating, hypothesis was supported. Brooding was not significant (β = 0.15, t = 1.92, p = 0.06) with social problem solving controlled. Interventions to disengage rumination and improve social problem-solving skills are underscored.