Enhancing biomarker detection sensitivity through tag-laser induced breakdown spectroscopy with NELIBS.

Nanoparticle-enhanced laser-induced breakdown spectroscopy and Tag-LIBS are two approaches that have been shown to significantly enhance LIBS sensitivity and specificity. In an effort to combine both of these approaches, we have initiated a study on the effect of the presence of Silver nanoparticle concentrations on Europium (Eu) and Ytterbium (Yb) LIBS signals. These elements are part of metal-loaded polymers conjugated to antibodies. We observe a signal enhancement of the emission lines of about 10 and 12 times for the Europium and Ytterbium lines. This study shows that Europium and Ytterbium are enhanced differently; Europium shows enhancement for both neutral and ionized species while the Ytterbium shows enhancement only for ionized species. Additionally, we found that NPs at 0.1 mg/mL and 0.05 mg/mL achieved maximum enhancement for Eu and Yb, respectively. Based on our findings, the temperature and electron density of Eu and Yb are not significantly different for NPs concentrations, but the total signal intensity is significantly higher for optimum NP concentrations for both Eu and Yb.

The effects of soy supplementation on inflammatory biomarkers: A systematic review and meta-analysis of randomized controlled trials.

BACKGROUND: Soy products contain several compounds with anti-inflammatory properties like genistein and daidzein which reported to act through different pathways. Present study conducted considering the inconsistent results and lack of any comprehensive review regarding randomized controlled trials which assess the effect of soy products on inflammatory markers. METHODS: Following electronic databases were searched up to March 2020: PubMed, Scopus, ISI web of science, and Cochrane Library All randomized trials which assessed the effect of soy product supplementation on c-reactive protein (CRP), tumor necrosis factor-alpha (TNF-α) and interleukin-6 (IL-6) were included for last analysis. Treatment effects were expressed as mean difference (MD) and the standard deviation (SD) of outcomes. To estimate the overall effect the random-effects model was employed. RESULTS: Finally, 51 randomized trial were included for present study. Last analysis showed that soy product supplementation lead to significant reduction in CRP (MD -0.27 mg/L; 95% CI: -0.51, -0.02, p = 0.028) but it did not affect IL-6 (MD 0.0 pg/ml; 95% CI: -0.06, 0.06, p = 0.970) and TNF-α (MD = -0.04 pg/ml; 95% CI: -0.11, 0.03, p = 0.252). Subgroup analysis showed that soy supplementation had a significant impact on decreasing IL-6 and TNF-α levels when studies had a long-term intervention (≥12 weeks) and used low dose isoflavone (<100 mg/day). CONCLUSION: In conclusion, present systematic review and meta-analysis found a significant reduction in CRP levels after soy supplementation whiles IL-6 and TNF-α did not affect.

Mediating Role of Perceived Stress in the Relationship between Facing Existential Issues and Symptoms of Depression and Anxiety.

Objective: This study aimed at investigating the mediating role of perceived stress in anticipation of anxiety and depression on facing the ultimate concerns (death, loneliness, freedom, and meaningfulness). Method : A total of 389 students from Ferdowsi University of Mashhad participated in this study in 2017-18. The participants were selected using random sampling. The data were collected using the subscales of anxiety and depression in depression, anxiety, stress scale (DASS), Death Anxiety Scale (DAS), the third edition of Loneliness Scale UCLA (UCLA-LS), the subscale of meaning in life in Meaningfulness of Life Questionnaire (MLQ), responsibility scale of California Psychological Inventory (CPI), and the Perceived Stress Scale (PSS). Then, they were evaluated using Pearson correlation and path analysis. Results: The correlation between the symptoms of anxiety and depression, and death anxiety and loneliness was direct and significant with the perceived stress. The relationship between the perceived stress with meaningfulness of life and responsibility was significantly inverse. The analysis of the data path showed that the component dealing with existence (loneliness and death anxiety) predicted 20% of anxiety symptoms through perceived stress in the model that was fitted well with research data. Conclusion: According to the findings, it can be concluded that the relationship between dealing with ultimate concerns and anxiety symptoms was not linear. Dealing with ultimate concerns affects the anxiety symptoms through the perceived stress. Therefore, attention to the perceived stress management to promote health and prevent anxiety disorders is important.