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1. A simple and effective dansyl acid based “turn-on” fluorescent probe for detecting labile ferrous iron in physiological saline and live cells

Author:
Gao, Guangqin; Wang, Xiao; Wang, Zhimin; Jin, Xianchun; Ou, Ling; Zhou, Jingjing; Xie, Puhui
Source:
Talanta 2020 v.215 pp. 120908
ISSN:
0039-9140
Subject:
pH,   etc   ; fluorescence; fluorescent dyes; iron;     Show all 4 Subjects
Abstract:
... Labile ferrous iron (Fe²⁺) plays important biochemical functions in many physiologically essential processes. It is very important to find an effective method to detect Fe²⁺. Herein, a simple and effective Fe²⁺ fluorescent probe (FeP1) has been constructed via a unique strategy of Fe²⁺-induced reducing reaction. As expected, FeP1 exhibited a ‘turn-on’ fluorescence response toward Fe²⁺ over various ...
DOI:
10.1016/j.talanta.2020.120908

2. Semiquantitative naked-eye detection of Cu(ii) with a standard colorimetric card via a hydrogel-coated paper sensor

Author:
Fan, Kaiqi; Wang, Xiaobo; Yang, Haoran; Gao, Lijun; Han, Guanglu; Zhou, Liming; Fang, Shaoming
Source:
Analytical methods 2020 v.12 no.12 pp. 1561-1566
ISSN:
1759-9679
Subject:
pH,   etc   ; copper; heavy metals; ions;     Show all 4 Subjects
Abstract:
... A new type of hydrogel-coated paper sensor was developed for the semiquantitative and naked-eye detection of Cu²⁺ ions with high selectivity and good regenerability. The paper sensor showed a continuous color change from colorless to blue, resulting in semiquantitative naked-eye detection. Furthermore, similar to the classical pH test paper, a standard colorimetric card was used in the visual dete ...
DOI:
10.1039/d0ay00038h

3. Correction to: A pH-responsive genetic sensor for the dynamic regulation of D-xylonic acid accumulation in Escherichia coli

Author:
Bañares, Angelo B.; Valdehuesa, Kris Niño G.; Ramos, Kristine Rose M.; Nisola, Grace M.; Lee, Won-Keun; Chung, Wook-Jin
Source:
Applied microbiology and biotechnology 2020 v.104 no.5 pp. 2273-2274
ISSN:
0175-7598
Subject:
pH,   etc   ; Escherichia coli; sensors (equipment);     Show all 3 Subjects
Abstract:
... In the published version, the y-axis data of Fig. 3c was incorrectly inserted (OD600 instead of D-xylonate (g L⁻¹) and the x-axes of Figs. 3b, 3d, 3e and 3f ended at 48 h instead of 72 h. See the correct Fig. 3 below. ...
DOI:
10.1007/s00253-020-10362-z

4. Novel silica forming peptide, RSGH, from Equus caballus: Its unique biosilica formation under acidic conditions

Author:
Min, Ki Ha; Yeo, Ki Baek; Ki, Mi-Ran; Jun, Sang Ho; Pack, Seung Pil
Source:
Biochemical engineering journal 2020 v.153 pp. 107389
ISSN:
1369-703X
Subject:
pH,   etc   ; horses; peptides; silica; yeasts;     Show all 5 Subjects
Abstract:
... A novel silica forming peptide (SFP), RSGH was designated on the basis of the peptide found from Equus caballus and investigated for its ability to precipitate biosilica under acidic conditions, where biosilica is not easily formed. At pH values of 4, 5 and 6, RSGH showed better performance in the generation of silica particles than the most well-known SFP, silaffin R5, and the amount of the produ ...
DOI:
10.1016/j.bej.2019.107389

5. Prokaryotic communities in multidimensional bottom-pit-mud from old and young pits used for the production of Chinese Strong-Flavor Baijiu

Author:
Zhang, Huimin; Meng, Yajing; Wang, Yanli; Zhou, Qingwu; Li, Anjun; Liu, Guoying; Li, Jingxin; Xing, Xinhui
Source:
Food chemistry 2020 v.312 pp. 126084
ISSN:
0308-8146
Subject:
pH,   etc   ; Lactobacillus; calcium; environmental factors; lactic acid;     Show all 5 Subjects
Abstract:
... The pit mud (PM) prokaryotic communities with obvious difference between old and young PM is essential for solid-fermentation of Chinese Strong-Flavor Baijiu. The bottom-PM (BPM) is considered more important. In this study, the multidimensional prokaryotic communities of old and young BPMs were investigated. The old BPM presented stratified difference within the depth of 0–7 cm, especially, the su ...
DOI:
10.1016/j.foodchem.2019.126084

6. Removal of contaminants of emerging concern by continuous flow solar photo-Fenton process at neutral pH in open reactors

Author:
Arzate, S.; Campos-Mañas, M.C.; Miralles-Cuevas, S.; Agüera, A.; García Sánchez, J.L.; Sánchez Pérez, J.A.
Source:
Journal of environmental management 2020 v.261 pp. 110265
ISSN:
0301-4797
Subject:
pH,   etc   ; effluents; hydrogen peroxide; iron; wastewater treatment;     Show all 5 Subjects
Abstract:
... For the first time, the operational feasibility of the solar photo-Fenton process at neutral pH in continuous flow has been tested for three consecutive days. The aim of the treatment was to remove of contaminants of emerging concern (CECs) from wastewater treatment plant secondary effluents. To this end, a 5 cm-deep raceway pond reactor was run in continuous flow mode and the degradation of the C ...
DOI:
10.1016/j.jenvman.2020.110265

7. A photometric pH assay for microplate bacterial cultures

Author:
Takao, Ayuko; Tomoyasu, Toshifumi; Tabata, Atsushi; Nagamune, Hideaki; Maeda, Nobuko
Source:
Journal of microbiological methods 2020 v.172 pp. 105910
ISSN:
0167-7012
Subject:
pH,   etc   ; bacterial contamination; measuring devices; photometry; risk;     Show all 5 Subjects
Abstract:
... A photometric pH assay for sugar-fermenting bacterial culture on a 96-well plate was developed. This assay can save time and effort in repeat handlings. Its use could decrease the risk of bacterial contamination in measurement devices and leakage into the environment. The assay's pH estimation range was pH 4.2–7.6. ...
DOI:
10.1016/j.mimet.2020.105910

8. A review on the use of chelating agents as an alternative to promote photo-Fenton at neutral pH: Current trends, knowledge gap and future studies

Author:
Ahile, Ungwanen J.; Wuana, Raymond A.; Itodo, Adams U.; Sha'Ato, Rufus; Dantas, Renato F.
Source:
The Science of the total environment 2020 v.710 pp. 134872
ISSN:
0048-9697
Subject:
pH,   etc   ; chelating agents; chelation; iron; iron oxides;     Show all 5 Subjects
Abstract:
... In this review, we have critically examined the alternatives to conventional photo-Fenton process such as the strategies to perform it in circumneutral pH in the so-called photo-Fenton like process. They include iron chelation, iron replacement with another metal and use of iron immobilized on surfaces of solid materials, use of iron oxides, among others. The use of such strategies can be employed ...
DOI:
10.1016/j.scitotenv.2019.134872

9. Pt enhanced the photo-Fenton activity of ZnFe2O4/α-Fe2O3 heterostructure synthesized via one-step hydrothermal method

Author:
Wang, Xue; Feng, Jing; Zhang, Zhiqiang; Zeng, Wenjing; Gao, Mingming; Lv, Yanzhuo; Wei, Tong; Ren, Yueming; Fan, Zhuangjun
Source:
Journal of colloid and interface science 2020 v.561 pp. 793-800
ISSN:
0021-9797
Subject:
pH,   etc   ; electrons; hematite; hot water treatment; nanoparticles;     Show all 5 Subjects
Abstract:
... The photo-Fenton activity of ZnFe₂O₄ was enhanced by the ZnFe₂O₄/α-Fe₂O₃ (ZFO/FO) heterostructure synthesized via a one-step hydrothermal method. The degradation efficiency was further improved by loading Pt nanoparticles on the surface of the heterostructure. The degradation efficiencies of MB for ZnFe₂O₄, ZFO/FO, and ZFO/FO/Pt were 57.82%, 83.71%, and 99.96%, respectively. This can be ascribed t ...
DOI:
10.1016/j.jcis.2019.11.058

10. High throughput covalent immobilization process for improvement of shelf-life, operational cycles, relative activity in organic media and enzymatic kinetics of urease and its application for urea removal from water samples

Author:
Hormozi Jangi, Saeed Reza; Akhond, Morteza; Dehghani, Zahra
Source:
Process biochemistry 2020 v.90 pp. 102-112
ISSN:
1359-5113
Subject:
pH,   etc   ; catalytic activity; shelf life; urea; urease;     Show all 5 Subjects
Abstract:
... High throughput covalent urease immobilization was performed through the amide bond formation between the urease and the amino-functional MNPs. The enzyme’s performances, including shelf-life, reusability, enzymatic kinetics, and the enzyme relative activity in organic media was improved. At optimal conditions, the immobilization efficiency was calculated about 95.0% with keeping 94.7% of the urea ...
DOI:
10.1016/j.procbio.2019.11.001

11. Mechanisms of response to pH shock in microbial fermentation

Author:
Pan, Long; Chen, Xu-Sheng; Wang, Kai-Fang; Mao, Zhong-Gui
Source:
Bioprocess and biosystems engineering 2020 v.43 no.3 pp. 361-372
ISSN:
1615-7591
Subject:
pH,   etc   ; environmental factors; fermentation; genetic variation;     Show all 4 Subjects
Abstract:
... The following review highlights pH shock, a novel environmental factor, as a tool for the improvement of fermentation production. The aim of this review is to introduce some recent original studies on the enhancement of microbial fermentation production by pH shock. Another purpose of this review is to improve the understanding of the processes that underlie physiological and genetic differences, ...
DOI:
10.1007/s00449-019-02232-4

12. Changes in performance and bacterial communities in a continuous biohydrogen-producing reactor subjected to substrate- and pH-induced perturbations

Author:
García-Depraect, Octavio; Diaz-Cruces, Víctor F.; Rene, Eldon R.; León-Becerril, Elizabeth
Source:
Bioresource technology 2020 v.295 pp. 122182
ISSN:
0960-8524
Subject:
pH,   etc   ; bacterial communities; biohydrogen; fermentation; lactose; vinasse;     Show all 6 Subjects
Abstract:
... The performance and microbial communities of a continuous dark fermentation reactor exposed to perturbations induced by substrate change and acidic pH shock were investigated. A mesophilic well-mixed reactor separately fed with two types of tequila vinasses (TVs) and lactose was operated at a fixed pH of 5.5, except during short-term pH (3.8) stress, for ~61 days at decreasing hydraulic retention ...
DOI:
10.1016/j.biortech.2019.122182

13. Effect of DTPA on europium sorption onto quartz – Batch sorption experiments and surface complexation modeling

Author:
Karimzadeh, Lotfollah; Lippold, Holger; Stockmann, Madlen; Fischer, Cornelius
Source:
Chemosphere 2020 v.239 pp. 124771
ISSN:
0045-6535
Subject:
pH,   etc   ; europium; ligands; quartz; radionuclides; sorption; thermodynamics;     Show all 7 Subjects
Abstract:
... Sorption of radionuclides on mineral surfaces retards their migration in the environment of a repository. Presence of organic ligands, however, affects sorption and consequently influences their transport behavior. In this study, we quantify the sorption of Eu(III) onto quartz surfaces as a function of pH in the absence and presence of diethylenetriaminepentaacetic acid (DTPA). Batch sorption expe ...
DOI:
10.1016/j.chemosphere.2019.124771

14. Effects of excessive lithium deintercalation on Li+ adsorption performance and structural stability of lithium/aluminum layered double hydroxides

Author:
Zhong, Jing; Lin, Sen; Yu, Jianguo
Source:
Journal of colloid and interface science 2020 v.572 pp. 107-113
ISSN:
0021-9797
Subject:
pH,   etc   ; adsorbents; adsorption; aluminum; gibbsite; hydroxides; lithium; magnesium;     Show all 8 Subjects
Abstract:
... Lithium/aluminum layered double hydroxides (Li/Al-LDHs) have been industrially proven to be recyclable lithium adsorbents that do not dissolve upon elution, although they are hypersensitive to lithium deintercalation. In this study, the Li⁺ adsorption performances and structural stabilities of Li/Al-LDHs samples with different lithium deintercalation intensities are comprehensively investigated an ...
DOI:
10.1016/j.jcis.2020.03.081

15. Natural iron ligands promote a metal-based oxidation mechanism for the Fenton reaction in water environments

Author:
Farinelli, Giulio; Minella, Marco; Pazzi, Marco; Giannakis, Stefanos; Pulgarin, Cesar; Vione, Davide; Tiraferri, Alberto
Source:
Journal of hazardous materials 2020 v.393 pp. 122413
ISSN:
0304-3894
Subject:
pH,   etc   ; catalytic activity; cyclohexanones; free radicals; iron; ligands; oxidation; sludge;     Show all 8 Subjects
Abstract:
... The Fenton reaction is an effective advanced oxidation process occurring in nature and applied in engineering processes toward the degradation of harmful substances, including contaminants of emerging concern. The traditional Fenton application can be remarkably improved by using iron complexes with organic ligands, which allow for the degradation of contaminants at near-neutral pH and for the red ...
DOI:
10.1016/j.jhazmat.2020.122413

16. Engineered a novel pH-sensitive short major ampullate spidroin

Author:
Zhang, Chen; Mi, Jiali; Qi, Haishan; Huang, Jie; Liu, Simin; Zhang, Lei; Fan, Daidi
Source:
International journal of biological macromolecules 2020 v.154 pp. 698-705
ISSN:
0141-8130
Subject:
pH,   etc   ; amino acids; biocompatibility; cytotoxicity; hemolysis; micelles; spidroins; spinning;     Show all 8 Subjects
Abstract:
... The pH diversification has been proved as an important factor affecting the self-assembly of spidroin. Herein, we constructed a novel spider silk protein (NT-MaSp1s-CT) with the pH-dependent secondary structures, containing pH-sensitive N-terminal, C-terminal domains and a repeated core region with merely 191 amino acids. Then pH sensitivity of NT-MaSp1s-CT was detected at different pH conditions ...
DOI:
10.1016/j.ijbiomac.2020.03.153

17. Effect of sodium alginate on phosphorus recovery by vivianite precipitation

Author:
Zhang, Cong; Hu, Dexiu; Yang, Ruijie; Liu, Zichen
Source:
Journal of environmental sciences (China) 2020 v.93 pp. 164-169
ISSN:
1001-0742
Subject:
pH,   etc   ; crystallization; crystals; iron; phosphorus; polymers; sludge; sodium alginate; wastewater;     Show all 9 Subjects
Abstract:
... There are good prospects for phosphorus recovery from excess sludge by vivianite crystallization while a large number of extracellular polymeric substances in sludge will have impact on vivianite precipitation. In this study, as a representative of extracellular polymeric substance, the effect of sodium alginate (SA) on phosphorus recovery by vivianite precipitation under different initial SA conc ...
DOI:
10.1016/j.jes.2020.04.007

18. Effects of extreme pH conditions on the stability of As(V)-bearing schwertmannite

Author:
Wang, Yingxu; Gao, Meijuan; Huang, Wanyi; Wang, Tao; Liu, Yuanyuan
Source:
Chemosphere 2020 v.251 pp. 126427
ISSN:
0045-6535
Subject:
pH,   etc   ; arsenic; binding capacity; chemical equilibrium; goethite; iron; sulfates; toxicity;     Show all 8 Subjects
Abstract:
... Schwertmannite (Sch) is known to be an effective scavenger of arsenic (As) due to its strong binding affinity for toxic As species. However, the evolution of As-bearing schwertmannite under extreme pH conditions is poorly understood. In this study, we investigated the effects of extremely acidic and alkaline conditions on the stability of schwertmannite with structurally incorporated As(V) (CO-Sch ...
DOI:
10.1016/j.chemosphere.2020.126427

19. A novel microfluidic aqueous two-phase system with immobilized enzyme enhances cyanidin-3-O-glucoside content in red pigments from mulberry fruits

Author:
Zhou, Xue-Jiao; Zhu, Chang-Tong; Hu, Yan; You, Shuai; Wu, Fu-An; Wang, Jun
Source:
Biochemical engineering journal 2020 v.158 pp. 107556
ISSN:
1369-703X
Subject:
pH,   etc   ; Morus rubra; immobilized enzymes; mulberries; pigments; temperature; China;     Show all 7 Subjects
Abstract:
... Mulberry red pigments are safe, nontoxic and are one of the 48 natural pigments officially approved in China. Cyanidin-3-O-glucoside accounts for about 20 % of the total mulberry red pigments and has high physiological activity. Therefore, a novel microfluidic aqueous two-phase system with immobilized enzyme was constructed to enhance the cyanidin-3-O-glucoside content in red pigments under parall ...
DOI:
10.1016/j.bej.2020.107556

20. Metal-crosslinked ɛ-poly-L-lysine tissue adhesives with high adhesive performance: Inspiration from mussel adhesive environment

Author:
Li, Sidi; Chen, Ning; Li, Yang; Li, Xueping; Zhan, Qi; Ban, Jiamin; Zhao, Jin; Hou, Xin; Yuan, Xubo
Source:
International journal of biological macromolecules 2020 v.153 pp. 1251-1261
ISSN:
0141-8130
Subject:
pH,   etc   ; adhesion; bioadhesives; cohesion; fibrin; iron; models; mussels;     Show all 8 Subjects
Abstract:
... Strong glue of mussels has long been considered as an ideal model to design synthetic bio-adhesives but the adhesive strength of metal-crosslinked mussel-inspired glues is not often satisfactory. Herein, inspired by the adhesive environment of mussels, we obtained metal-crosslinked ε-poly-L-lysine adhesives with high adhesive performance by introducing the elements of suitable adhesive environment ...
DOI:
10.1016/j.ijbiomac.2019.10.257