Aqueous Solutions
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2022 ◽  
Vol 427 ◽  
pp. 132034
Ching-Lung Chen ◽  
Yu-Jen Shih ◽  
Jenn Fang Su ◽  
Kuan-Ling Chen ◽  
Chin-Pao Huang

2022 ◽  
Vol 430 ◽  
pp. 132788
Jaehyuk Kang ◽  
Ferdinan Cintron-Colon ◽  
Hyojoo Kim ◽  
Jueun Kim ◽  
Tamas Varga ◽  

2021 ◽  
Vol 9 (6) ◽  
pp. 106483
Sivarama Krishna Lakkaboyana ◽  
Soontarapa Khantong ◽  
Nabel Kalel Asmel ◽  
Salehie Obaidullah ◽  
Vinay Kumar ◽  

2021 ◽  
Vol 54 ◽  
pp. 101746
Yingqiang Zhu ◽  
Puzhen Li ◽  
Xiantao Feng ◽  
Dongsheng Sun ◽  
Tianwen Fang ◽  

2021 ◽  
Ana H. Sales ◽  
Sam Ciervo ◽  
Tania Lupoli ◽  
Vladimir Shafirovich ◽  
Nicholas E Geacintov

The SARS 2 (Covid 19) helicase nsp13 plays a critically important role in the replication of the Corona virus by unwinding double-stranded RNA (and DNA) with a 5 prime to 3 prime strand polarity. Here we explored the impact of single, structurally defined covalent DNA lesions on the helicase activity of nsp13 in aqueous solutions, The objectives were to derive mechanistic insights into the relationships between the structures of DNA lesions, the DNA distortions that they engender, and the inhibition of helicase activity. The lesions included two bulky stereoisomeric N2-guanine adducts derived from the reactions of benzo[a]pyrene diol epoxide with DNA. The trans-adduct assumes a minor groove conformation, while the cis-product adopts a base-displaced intercalated conformation. The non-bulky DNA lesions included the intra-strand cross-linked thymine dimers, the cis-syn-cyclobutane pyrimidine dimer, and the pyrimidine (6–4) pyrimidone photoproduct. All four lesions strongly inhibit the helicase activity of nsp13, The UV photolesions feature a 2 - 5-fold smaller inhibition of the nsp13 unwinding activity than the bulky DNA adducts, and the kinetics of these two pairs of DNA lesions are also different. The connections between the structural features of these four DNA lesions and their impact on nsp13 unwinding efficiencies are discussed.

Crystals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1243
Anamarija Stanković ◽  
Martina Medvidović-Kosanović ◽  
Jasminka Kontrec ◽  
Branka Njegić Džakula

In this Special Issue, we focus on biomineralization/pathological biomineralization systems and the synthesis of bioinspired materials. This Special Issue promotes the current trend of “green chemistry”, and, as such, in all published papers, only aqueous solutions and eco-friendly additives were used for the production of well-characterized bioinspired materials [...]

Processes ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 1829
Liwen Zheng ◽  
Yongchao Gao ◽  
Jianhua Du ◽  
Wen Zhang ◽  
Yujie Huang ◽  

The chitosan–EDTA modified magnetic biochar (E–CMBC) was successfully used as a novel adsorbent to remove heavy metals. The adsorption behaviour and mechanisms of E–CMBC to Cd2+, Cu2+ and Ni2+ were performed in single and binary system in aqueous solutions. In single–metal system, the adsorption process of Cd2+, Cu2+ and Ni2+ on E–CMBC fitted well with the Avrami fractional–order kinetics model and the Langmuir isotherm model. The measured maximum adsorption capacities were 61.08 mg g−1, 48.36 mg g−1 and 41.17 mg g−1 for Cd2+, Cu2+ and Ni2+, respectively. In binary–metal system, coexisting ions have obvious competitive adsorption behaviour on E–CMBC when the concentration of heavy meal beyond 20 mg L−1. The maximum adsorption capacities of the heavy metals were found to be lower than that in single–metal system. The order of the competitive adsorption ability was Cu2+ > Ni2+ > Cd2+. Interestingly, in Cd2+–Cu2+ system the earlier adsorbed Cd2+ could be completely replaced by Cu2+ from the solution. Different competitive adsorption ability of those heavy metal were due to the characteristics of heavy metal and resultant affinity of the adsorption sites on E–CMBC. The adsorption mechanism indicated that chemical adsorption played a dominating role. Therefore, E–CMBC could be a potential adsorbent for wastewater treatment.

Catalysts ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1235
Bekbolat Seitov ◽  
Sherzod Kurbanbekov ◽  
Dina Bakranova ◽  
Nuriya Abdyldayeva ◽  
Nurlan Bakranov

Exploitation of common elements as photocatalysts for conversion of photons to electricity stimulates the development of a green energy strategy. In this paper, methods for the preparation of active coatings based on ZnO/Ag/CdS, which are used in the photocatalytic oxidation reaction, are examined. The physical and chemical properties of the resulting arrays were studied using optical spectrometers, an electron microscope, an X-ray diffractometer, and potentiostatic measurements and electrochemical impedance spectroscopy. The effectiveness of photocatalysts was calculated by the ability to liberate gas from aqueous solutions when exposed to light. The rate of degradation was indirectly measured with a conductometer.

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