Sorption Separation of Pairs of Elements with Similar Properties Pd(Ⅱ)-Pt(Ⅳ) and Pd(Ⅱ)-Cu(Ⅱ) Using Chemically Modified Silica Containing Sulfide Sulfur

The adsorption of Pd(Ⅱ), Pt(IV) and Cu(Ⅱ) in static and dynamic conditions on chemically modified silica containing sulfide sulfur (number of grafted functional groups of the sorbent was 0.2 (CMS-S 0.2) and 0 3 mmol/g (CMS-S 0.3)) was studied. It is established that an increase in the acidity of the sorption of Pd(Ⅱ) and Pt(Ⅳ) decreases, whereas the Cu(Ⅱ) does not change. Time to reach the constant values of the sorption is 15 min. In equal conditions, the sorption decreases in the number of Pd(Ⅱ)>Pt(IV)>Cu(Ⅱ). Based on retrieved data suggested that the sorption of Pd(Ⅱ) proceeds according the coordination mechanism. In the case of sorption from solutions with a high palladium content can be polymerization of adsorbed complexes in the sorbent phase. Worked out the optimal conditions for the separation of pairs of Pd(Ⅱ)-Pt(Ⅳ) and Pd(Ⅱ)-Cu(Ⅱ) under dynamic conditions with the extraction of palladium(Ⅱ) in the eluate is above 95%.

Synbiotic for Prevention of SARS-Cov2 Infection in High Risk Hospital Staffs: A Randomized Controlled Trial

Introduction: COVID-19 pandemic caused by the novel coronavirus SARS-CoV-2 increasingly involves people worldwide. Probiotics can improve immune system functions via different mechanisms. We proposed that Synbiotic Lactocare? may also reduce SARS-Cov2 infection in high-risk medical staff working in COVID-19 hospital wards. Method: In a randomized, controlled trial, 60 hospital staff without any history of clinical or laboratory evidence of SARS-Cov2 infection were received either once-daily oral synbiotic capsule (Lactocare?) that contains 1 billion CFU/Cap of L. (Lactobacillus) casei, L. rhamnosus, Streptococcus thermophilus, Bifidobacterium breve, L. acidophilus, Bifidobacterium infantis, L. bulgaricus, and Fructooligosacharide (Zist Takhmir, Tehran, Iran) or placebo with the same appearance for 30 days. They were followed for two months. Result: During the two-month period of this study, SARS-COV-2 RT-PCR test results were positive in three participants (9.67%) in placebo group compared to zero positive tests in synbiotic group. The differences were not statistically significant (p = 0.238). During the study, two persons (7 %) of placebo group had respiratory complaints such as cough, rhinorrhea and/or dyspnea, compared with one in synbiotic group (p = 0.492). Conclusion: This study showed that overall frequency of SARS-COV2 infection in participants receiving synbiotic and those receiving placebo did not differ significantly. However, 3 hospital staff in placebo group compared to no one in synbiotic group had SARS-COV2 infection. Further studies with greater power and alternative probiotic strains and mixture are warranted to determine whether Synbiotic can prevent COVID-19 in at-risk hospital staff.