Current Advances in Chemistry and Biochemistry Vol. 8最新文献

The Influence of Froth Height in Column Flotation of Kaolin Ore: An Advance Study 泡沫高度对高岭土矿石柱浮选影响的研究进展

Current Advances in Chemistry and Biochemistry Vol. 8 Pub Date : 2021-06-22 DOI: 10.9734/bpi/cacb/v8/10299d

F. Pita

{"title":"The Influence of Froth Height in Column Flotation of Kaolin Ore: An Advance Study","authors":"F. Pita","doi":"10.9734/bpi/cacb/v8/10299d","DOIUrl":"https://doi.org/10.9734/bpi/cacb/v8/10299d","url":null,"abstract":"In froth flotation, the froth height, the entrainment and the drainage of particles affects recovery and grade. The aim of the froth phase is to transport all the hydrophobic particles that reach the pulp/froth interface into the floated and the drainage of the hydrophilic particles into the pulp. In this study, the influence of the froth height in the reverse flotation of kaolinitic ore was analyzed based on the recovery by entrainment and by true flotation of iron, titanium and manganese oxides (FeO, TiO2 and MnO). Also, the influence of the particle size in drainage process was analyzed. A successfully flotation process involves minimization of the entrainment and maximization of the true flotation. The recovery by entrainment and by true flotation of the three oxides is inversely proportional to the froth height. The entrained particles are drained easier in the froth phase than the floated particles, since they are not attached to the bubbles. The recovery by entrainment and drainage of the entrained material is similar for the three oxides. However, the recovery by true flotation and drainage of the floated material is different for the three oxides. For true flotation in the three oxides, the finest fraction presents smaller froth zone recovery. FeO has the lowest recovery, as consequence of the minor contribution of its hydrophobic minerals, while MnO has the greatest recovery values. For the entrained material, the finest fraction ( 63 µm) is drained easier than the two intermediate fractions (+25-45 µm and +45-63 µm), indicating weaker attachment of the larger particles to the bubbles.","PeriodicalId":330459,"journal":{"name":"Current Advances in Chemistry and Biochemistry Vol. 8","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115416085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on Synthesis and Characterization of New 8-Trifluloromethyl Quinazolin-2,4-(3H)-Dione Nucleosides 新型8-三氟甲基喹唑啉-2,4-(3H)-二酮核苷的合成与表征

Current Advances in Chemistry and Biochemistry Vol. 8 Pub Date : 2021-06-22 DOI: 10.9734/bpi/cacb/v8/3185d

L. M. Break

引用次数: 0

Transition Metal Phthalocyanines as Nitrogen Oxydes Sensors 过渡金属酞菁作为氮氧化物传感器

Current Advances in Chemistry and Biochemistry Vol. 8 Pub Date : 2021-06-22 DOI: 10.9734/bpi/cacb/v8/7411d

A. Paoletti, G. Pennesi, G. Rossi, A. Generosi, B. Paci, V. R. Albertini

引用次数: 0

Enzymatic Potential of Rhizobacteria from the Amazon 亚马逊河根细菌的酶势

Current Advances in Chemistry and Biochemistry Vol. 8 Pub Date : 2021-06-22 DOI: 10.9734/bpi/cacb/v8/9432d

Cassiane Minelli-Oliveira, Paulo Rocha de Oliveira, André Luis Willerding, Luiz Antônio de Oliveira

{"title":"Enzymatic Potential of Rhizobacteria from the Amazon","authors":"Cassiane Minelli-Oliveira, Paulo Rocha de Oliveira, André Luis Willerding, Luiz Antônio de Oliveira","doi":"10.9734/bpi/cacb/v8/9432d","DOIUrl":"https://doi.org/10.9734/bpi/cacb/v8/9432d","url":null,"abstract":"Currently, about 6000 enzymes are known, but the amount is much higher than this number, especially if we consider regions of high biological diversity as in the Amazon rainforest. In plant rhizosphere, the chances of finding pathogenic bacteria in humans are very low, providing a safe genetic resource to be exploited biotechnologically. Research has indicated some products and enzymes of economic interest present in rhizobacteria isolated from Amazonian environments, such as plant growth hormones, phosphate solubilization, amylases, proteases, lipases, which could serve as raw material for the installation of bioindustries in the region. Most of our studies with the Amazonian microbiota aim to evaluate its functional genes, of economic and ecological interest. Enzymes such as cellulases, hemicellulases, ligninases, phosphatases, nitrogenases, lipases, chitinases, pectinases are of agronomic and forestry interest, found in regional microorganisms. The Amazonian microbiota has a high diversity and high biotechnological potential. This high microbial potential needs to be better known so that it can effectively contribute to regional and national development through the world market for enzymes and other metabolites of economic interest.","PeriodicalId":330459,"journal":{"name":"Current Advances in Chemistry and Biochemistry Vol. 8","volume":"59 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116474017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Estrogen Receptors and Estrogen-Induced Uterine Vasodilation in Pregnancy: A Review 雌激素受体和雌激素诱导的妊娠期子宫血管舒张:综述

Current Advances in Chemistry and Biochemistry Vol. 8 Pub Date : 2021-06-22 DOI: 10.9734/bpi/cacb/v8/9373d

Jin Bai, Yan Li, R. Magness, Dong-bao Chen

{"title":"Estrogen Receptors and Estrogen-Induced Uterine Vasodilation in Pregnancy: A Review","authors":"Jin Bai, Yan Li, R. Magness, Dong-bao Chen","doi":"10.9734/bpi/cacb/v8/9373d","DOIUrl":"https://doi.org/10.9734/bpi/cacb/v8/9373d","url":null,"abstract":"Normal pregnancy is associated with dramatic increases in uterine blood flow to facilitate the bidirectional maternal–fetal exchanges of respiratory gases and to provide sole nutrient support for fetal growth and survival. The mechanism(s) underlying pregnancy-associated uterine vasodilation remain incompletely understood, but this is associated with elevated estrogens, which stimulate specific estrogen receptor (ER)-dependent vasodilator production in the uterine artery (UA). The classical ERs (ER(alpha) and ER(beta)) and the plasma membrane-bound G protein-coupled ER (GPR30/GPER) are expressed in UA endothelial cells and smooth muscle cells, mediating the vasodilatory effects of estrogens through genomic and/or nongenomic pathways that are likely epigenetically modified. This chapter aims to summarize the literature on UA ERs with a focus on their roles in mediating the local UA production of vasodilators by estrogens and pregnancy and to deliberate on the potential clinic implications of dysregulated ER-mediated estrogen signaling in hypertensive pregnancy complications. The activation of these three ERs by estrogens enhances the endothelial production of nitric oxide (NO), which has been shown to play a key role in uterine vasodilation during pregnancy. However, the local blockade of NO biosynthesis only partially attenuates estrogen-induced and pregnancy-associated uterine vasodilation, suggesting that mechanisms other than NO exist to mediate uterine vasodilation. We summarize here the literature on the role of NO in ER-mediated mechanisms controlling estrogen-induced and pregnancy-associated uterine vasodilation and our recent work on a “new” UA vasodilator hydrogen sulfide (H2S) that has dramatically changed our view of how estrogens regulate uterine vasodilation in pregnancy.","PeriodicalId":330459,"journal":{"name":"Current Advances in Chemistry and Biochemistry Vol. 8","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133995002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Screening of Punica granatum Seeds for Antibacterial and Antioxidant Activity with Various Extracts: A Brief Analytical Study 石榴籽不同提取物抑菌抗氧化活性筛选的初步分析研究

Current Advances in Chemistry and Biochemistry Vol. 8 Pub Date : 2021-06-22 DOI: 10.9734/bpi/cacb/v8/2472f

N. Khan, A. Ying, Candy Goo Zhi Tian, Ooi Wei Yi, S. Vijayabalan

引用次数: 1

The Appropriate Acyclic Precursors to Build Biologically Active 5-acylamino-1,3-thiazoles 构建具有生物活性的5-酰基氨基-1,3-噻唑的合适的无环前体

Current Advances in Chemistry and Biochemistry Vol. 8 Pub Date : 2021-06-22 DOI: 10.9734/bpi/cacb/v8/9618d

Mara Tomassetti, G. Lupidi, S. Gabrielli, Federico Rossi, Samuele Lillini, Gianluca Bianchini, A. Aramini, Daniele Canestrari, E. Marcantoni

引用次数: 0

Allium cepa Linn Improved Rhodanese Activity and Half-life of Cyanide in the Blood 大蒜提高罗丹斯活性和血液中氰化物半衰期

Current Advances in Chemistry and Biochemistry Vol. 8 Pub Date : 2021-06-22 DOI: 10.9734/bpi/cacb/v8/8274d

F. Ola-Mudathir

{"title":"Allium cepa Linn Improved Rhodanese Activity and Half-life of Cyanide in the Blood","authors":"F. Ola-Mudathir","doi":"10.9734/bpi/cacb/v8/8274d","DOIUrl":"https://doi.org/10.9734/bpi/cacb/v8/8274d","url":null,"abstract":"Rhodanese is an intramitochondrial liver enzyme that detoxifies cyanide. Allium cepa (Onion); rich in organosulphur may provide sulphur for the detoxification of cyanide. The possible effects of Allium cepa on rhodanese activity during cyanide toxicity was investigated in vitro and in vivo in male Wistar rats. In vivo experiments studied the effects of methanol extract of onion (MEAC) and sodium thiosulphate (Na2S2O3) on rhodanese activity, urine thiocyanate concentration and effects of MEAC, raw onion and Na2S2O3 on half-life of potassium cyanide (KCN). In vitro experiments studied the effects of MEAC and essential oil of onion on rhodanese activities in the liver cells. Results of the in vivo study revealed that administration of Na2S2O3 in the cyanide treated group enhance activity of rhodanese, while the extract did not enhance it. The results of the in vitro study showed that essential oil of onion increased rhodanese activity 10 fold that of the extract. The half-life of KCN was significantly lower (p<0.05) with consumption of raw onion when compared with control. The results suggest that Allium cepa enhance cyanide detoxification by enhancing rhodanese enzyme activity and by reducing the half-life of cyanide in the blood.","PeriodicalId":330459,"journal":{"name":"Current Advances in Chemistry and Biochemistry Vol. 8","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127392472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0