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2016-1-12 · Results. In this study, we developed a process for high-optical-purity d-lactate production using an engineered alkaliphilic Bacillus strain. First, the native l-lactate dehydrogenase gene (ldh) was knocked out, and the d-lactate dehydrogenase gene from Lactobacillus delbrueckii was introduced to construct a d-lactate producer.The key gene responsible for exopolysaccharide biosynthesis (epsD ...
Get Price2018-12-12 · In this study, the Esterification wastewater was treated by three kinds of flocculants (poly aluminum chloride (PAC), polymeric ferric sulfate (PFS), poly aluminum ferric chloride (PAFC)), the influences of flocculent concentration, temperature and pH on …
Get PriceClay-brine process employing activated clay, NaCl, HCl, and HF as raw materials is the primarily advanced technology to synthesize cryolite in the present industrial grade. However, plenty of byproducts of fluorine-containing waste HCl at the concentration of about 10%~12% could not be utilized comprehensively and are even hazardous to the environment.
Get Price2020-8-20 · Advances in understanding the relation between nutrition and health to achieve optimal health and reduce the risk of disease have led to the development of high‐fat foods. In this study, the maximum production of GABA using L. brevis A3 strain was obtained in culture medium containing 14.96% whey with 4.95% MSG at 37°C and for 48 hr at 53.5 ...
Get Price2021-5-21 · The optimal medium and cultural conditions for PHB and CoQ 10 co-production by Methylobacterium sp. XJLW was in M3 medium containing 7.918 g L-1 methanol, 0.5 g L-1 of ammonium sulfate, 0.1% (v/v) of Tween 80, and 1.0 g L-1 of sodium chloride, under 30 °C and pH 7.0.
Get Price2021-3-30 · colorization ratio, but it also has the disadvantages of strong corrosion, high chloride ion concentration in wastewater, and high toxicity of intermediate products [13]. Fenton reaction is one of the commonly used advanced oxidation processes (AOPs), which has the advantages of high safety, simple equipment, and low cost, but there is a
Get Price2020-2-18 · High-poly-aluminum chloride sulfate (HPACS) coagulants with different [SO 4 2−]/[Al 3+] molar ratio (S) were prepared and proved to have high coagulation efficiency for the removal of humic acid and strong stability for storage and application.The results showed that the higher the SO 4 2− addition, the bigger the aluminum polymerization particles and the more the polymerization Al c ...
Get Price2021-1-2 · The cyclic carbonates as non-isocyanate polyurethane (NIPU) precursors are usually prepared via CO2 fixation under harsh conditions for a satisfactory conversion rate, which is energy-intensive. Herein, cyclic carbonate was prepared under ambient conditions with high purity and yield using a water-soluble ethyl-(N′,N′dimethylamino) propylcarbodiimide hydrochloride (EDC) to provide a ...
Get Price2017-3-2 · Due to their unique properties, lignosulfonates have a wide range of uses, such as animal feed, pesticides, surfactants, additives in oil drilling, stabilizers in colloidal suspensions, and as plasticizers in concrete admixtures. 13, 14, 31-34 However, the majority of pulp mills employ kraft technology for pulp production, and thus, kraft lignin is more readily available for value-added ...
Get PriceHigh-purity CaCO3 via a facile two-step dissolution-carbonation coprecipitation procedure using NH4Cl, NH4OH and CO2 with phosphogypsum as the raw material was successfully produced in the present ...
Get Price2016-1-12 · Results. In this study, we developed a process for high-optical-purity d-lactate production using an engineered alkaliphilic Bacillus strain. First, the native l-lactate dehydrogenase gene (ldh) was knocked out, and the d-lactate dehydrogenase gene from Lactobacillus delbrueckii was introduced to construct a d-lactate producer.The key gene responsible for exopolysaccharide biosynthesis (epsD ...
Get Price2018-12-12 · In this study, the Esterification wastewater was treated by three kinds of flocculants (poly aluminum chloride (PAC), polymeric ferric sulfate (PFS), poly aluminum ferric chloride (PAFC)), the influences of flocculent concentration, temperature and pH on …
Get Price2014-3-26 · The performance of hot-water extraction (HWE) and steam treatment (ST), followed by kraft pulping were compared for production of high purity-grade dissolving pulp from green bamboo. With the same prehydrolysis intensity (represented by the P-factor), the fractionation efficiency of HWE is far lower than that of ST. Because of lower removal of non-cellulosic components, the solid residue from ...
Get Price2016-7-28 · Boric acid is often added into coolant as neutron capture agent for pressurized water reactor, whose amount is influenced by its abundance and purity. Therefore, the preparation of enriched 10B boric acid with high purity is beneficial to nuclear industry. 10B is also used in developing tumor-specific boronated drugs in boron neutron capture therapy.
Get Price2017-11-24 · Under the conditions of the optimal parameters, the content of ZnSO 4 ∙7H 2 O in the product obtained by chemical analysis was 98.6%, and the …
Get Price2018-10-10 · 1. Introduction. Functional foods are defined by the European Commission as “a food product that can only be considered functional if together with the basic nutritional impact it has beneficial effects on one or more function of the human organism thus either improving the general physical conditions or/and decreasing the risk of the evolution of disease” [].
Get Price2019-10-22 · In this study, two cultivation methods for production of a class of new compounds, atrorosins, in high purity was presented. For industrial relevance, the two-step cultivation method is to be preferred, as it is cheaper in terms of nitrogen source, because only 2 g/L of amino acid was used, compared to 10 g/L in the one-step cultivation.
Get Price2017-3-2 · Due to their unique properties, lignosulfonates have a wide range of uses, such as animal feed, pesticides, surfactants, additives in oil drilling, stabilizers in colloidal suspensions, and as plasticizers in concrete admixtures. 13, 14, 31-34 However, the majority of pulp mills employ kraft technology for pulp production, and thus, kraft lignin is more readily available for value-added ...
Get Price2021-3-26 · High expression of EctB and high ratio of EctB/EctA are key to the efficient ectoine production, indicating that EctB is a rate-limiting enzyme in ectoine biosynthesis. With the fast development of multi-omics, molecular systems biology and synthetic biology, one might expect more economical production of ectoine and hydroxyectoine in future.
Get Price2018-12-12 · In this study, the Esterification wastewater was treated by three kinds of flocculants (poly aluminum chloride (PAC), polymeric ferric sulfate (PFS), poly aluminum ferric chloride (PAFC)), the influences of flocculent concentration, temperature and pH on …
Get Price2019-7-23 · Optimal Corrosion Control Treatment Evaluation Technical Recommendations for Primacy Agencies and Public Water Systems Office of Water (4606M) EPA 816-B-16-003
Get PriceThe optimal conditions were as follows: Coagulant dosage of 871 mg/L, flocculent dosage of 22.3 mg/L and pH 8.35. The study of dairy effluents treatment by EC was carried out using aluminum electrodes. The analysis of the filtrates showed that the COD was reduced to 61% while the removal of phosphorus, nitrogen contents and turbidity were 89 ...
Get Price2020-7-3 · The prerequisite to synthesize PCE was to prepare new macromonomers with controlled molecular mass, adjustable hydrophilic-lipophilic groups, long-chain alkyl groups, and large terminal hydroxyl groups as well. Structural modifications in the molecular scale of polycarboxylate superplasticizer (PCE) would lead to changes in properties of dispersion and water retention as well …
Get Price2006-5-3 · The physical properties of natural organic matter (NOM) flocs, such as size, growth rate, and strength, were investigated using a laser diffraction particle sizing device. Conditions were set such that varying carbon coagulant ratio and zeta potential could both be investigated. Results demonstrated a link between zeta potential and coagulation and flocculation performance, with the production ...
Get Price2021-4-5 · Figure 6 shows the XPS spectra of FeS 2 /TiO 2 nanocomposite film prepared under hydrothermal reaction time of 12 h, ferric chloride concentration of 0.15 mmol/L and reaction temperature of …
Get Price2014-6-7 · Production conditions of the solution target were 1.7 M 68 Zn(NO 3) 2 in 0.2 N HNO 3 solution at 20 μA beam current over a 30 min irradiation. The production yield of 68 Ga was found to be 192.5 ± 11.0 MBq/μA·h after isotope separation having specific …
Get Price2021-5-10 · Production of isolated fl nsp14 was successful, however, with limited yield and stability . Expression of the isolated MTase domain resulted in soluble protein with 27.5 kDa mass that was amenable to NMR characterization , although only under reducing conditions and in the presence of high (0.4 M) salt concentration. nsp15
Get Price2017-3-2 · Due to their unique properties, lignosulfonates have a wide range of uses, such as animal feed, pesticides, surfactants, additives in oil drilling, stabilizers in colloidal suspensions, and as plasticizers in concrete admixtures. 13, 14, 31-34 However, the majority of pulp mills employ kraft technology for pulp production, and thus, kraft lignin is more readily available for value-added ...
Get Price2021-3-2 · Overall, employing optimal induction conditions improved the CS sulfation in E. coli K4ΔkfoEΔcysH(DE3) pETM6-S w from ~19% to ~23%. Fig. 4: Effect of fermentation conditions …
Get Price2013-11-29 · A newly isolated poly(3-hydroxybutyrate) [P(3HB)] producing strain, ST1C, was identified as Bacillus aryabhattai based on its morphological, biochemical and molecular characteristics. It synthesized and accumulated relatively high amounts of P(3HB). The aim of this work was to establish if it could convert an inexpensive liquid waste product from the production of biodiesel, biodiesel liquid ...
Get Price2011-3-8 · Applied and Environmental Microbiology Article September 2020. 3-Hydroxypyridine Dehydrogenase HpdA Is Encoded by a Novel Four-Component Gene Cluster and Catalyzes the First Step of 3-Hydroxypyridine Catabolism in Ensifer adhaerens HP1. Haixia Wang, Xiaoyu Wang, Hao Ren, Xuejun Wang and.
Get Price2020-6-9 · Surfactin is one of the main lipopeptide biosurfactants produced by different species of Bacillus subtilis.This study aims to analyze the effect of starch‐coated Fe 0 and Fe 3+ nanoparticles on the biomass and biosurfactant production of Bacillus subtilis.Out of 70 soil samples, 20 Bacillus were isolated and genome sequenced by biochemical methods and 16S rRNA gene.
Get Price2016-1-6 · Chromium pollution is a serious issue because of carcinogenic toxicities of the pollutants and low recovery rate of chromium because of the presence of organic, such as protein and fat. In this work, high recovery rate and high purity of the chromium ion were successfully prepared by the way of acid enzyme, flocculant, and Fenton oxidation. The experiments were characterized by TG, TOC, UV-VIS ...
Get Price2018-6-28 · The objectives of this study were: (1) to evaluate chitosan flocculation performance in the harvesting of C. vulgaris biomass and determine its optimal dose, (2) to disclose the sedimentation properties of C. vulgaris biomass flocculated by chitosan, (3) to reveal the recyclability of the spent medium from flocculation to regrow microalgae and ...
Get PriceThe extreme thermoacidophile Sulfolobus solfataricus strain MT4 and strain MT3 were observed to produce a sulfated-, glucose-, mannose-, glucosamine-, and galactose-containing exopolysaccharide during growth under optimal conditions.The maximum production was reached during the stationary phase of growth and the yields obtained were 8.4 mg/L and 7.0 mg/L for MT4 and MT3 strains, …
Get Price2021-4-5 · Preparation of TiO 2 nanotube array films. Firstly, cut the industrial titanium plate (20 mm × 10 mm × 0.3 mm) with purity greater than 99.6%, and ultrasonic cleaning with acetone, absolute ...
Get Price2 天前 · This page describes the Contact Process for the manufacture of sulphuric acid, and then goes on to explain the reasons for the conditions used in the process. It looks at the effect of proportions, temperature, pressure and catalyst on the composition of the equilibrium mixture, the rate of the ...
Get PriceA student performed the synthesis of aspirin using a water bath at 90C instead of 50C. The final product was tested for the presence of phenols with ferric chloride. This test was negative (no colo...
Get Price2020-2-11 · The change regulations of the smelting parameters in a gas-injection blast furnace are investigated using theoretical calculations. The results show that when the volume of gas injected, the oxygen enrichment rate and the theoretical combustion temperature of tuyere are 600 m 3 /tHM, 10% and 1950~2200 ∘ C, respectively, the conditions meet the smelting requirements of a blast furnace. With ...
Get Price2019-2-1 · For example, Zhu et al. (Zhu et al. 2007) studied the treatment of excess sludge with PAM (polyacrylamide) - PAFC (polymeric ferric chloride), and found that when the total dosage of flocculants was 190 mg/L, the moisture content in sludge decreased from 97% to 79%, and the sludge volume decreased by 86%.
Get Price2021-7-5 · It is particularly suited to the production of polymer beads, typically in the range of 5-1000 µm [1]. Some of the main commercial resins produced by suspension polymerization processes are styrenic resins, such as general purpose polystyrene, expandable polystyrene (EPS), high-impact polystyrene (HIPS), poly (styrene-
Get Price2018-10-17 · Chemicals. Poly-aluminum chloride (Al 2 (OH) n Cl 6−n.YH 2 O, Al 2 O 3 = 30%wt, basicity = 65% and pH = 3) was used as a coagulant and anionic (A 300), cationic (C 270) and nonionic polymers, as the coagulant aids were provided from AquaTech Company, Switzerland.. Preparation of solution. In order to prepare a 10 percent clear solution for coagulant, 10 g of PAC was dissolved to 100 mL of ...
Get Price2021-2-1 · As is well-known, endo-1,4-β-xylanase and β-xylosidase are the rate-limiting enzymes in the degradation of xylan (the major hemicellulosic component), main functions of which are cleavaging xylan to release xylooligosaccharides (XOS) and xylose that these two compounds have important application value in fuel, food, and other industries. This study focuses on enzymatic hydrolysis of poplar ...
Get Price2018-5-15 · The aim of this study was to find the best conditions to radiolabel VH-13 with technetium-99m to avoid the potential formation of aggregates during the radiolabeling process. Methods: VH-13 contains a poly-His tag in C-terminal position that is a specific site suitable for labeling with Tc-99m using the tricarbonyl method.
Get Price2021-3-12 · The only argument against crystalline Si as the ideal PV material both now and in the future pertains to the fourth criterion. That is, the availability, collection, and manufacture of crystalline Si are extremely problematic. More precisely, because Si in nature is found only as impure, oxidized sand (silica/SiO 2) or silicates (a salt with SiO 4–x (4–2x)–), the chemistries required for ...
Get PriceThe present study, for the first time, reveals different optimal conditions for algal biomass solubilization and sugar release. Read More. View Article and Full-Text PDF. June 2021. Similar Publications. Effect of digestate loading rates on microalgae-based treatment under low LED light intensity.
Get PriceVarious pollutants of different sizes are directly (e.g., water-borne diseases) and indirectly (e.g., accumulation via trophic transfer) threatening our water health and safety. To cope with this matter, multifaceted approaches are required for advanced wastewater treatment more efficiently. Wastewater treatment using mixed matrix membranes (MMMs) could provide an excellent alternative since ...
Get Price2021-7-1 · In this study, two highly thermotolerant and methanol-tolerant lipase-producing bacteria were isolated from cooking oil and they exhibited a high number of catalytic lipase activities recording 18 ...
Get Price2020-2-11 · The change regulations of the smelting parameters in a gas-injection blast furnace are investigated using theoretical calculations. The results show that when the volume of gas injected, the oxygen enrichment rate and the theoretical combustion temperature of tuyere are 600 m 3 /tHM, 10% and 1950~2200 ∘ C, respectively, the conditions meet the smelting requirements of a blast furnace. With ...
Get Price2018-6-11 · Maximizing Antibody Production in Suspension-Cultured Mammalian Cells by the Customized Transient Gene Expression Method Min YOU,1 Yanning LIU,1 Yingwei CHEN,2 Jiyuan GUO,1 Jun WU,1 Yajuan FU,1 Rong SHEN,1 Rui QI,1 Wenxin LUO,1;y and Ningshao XIA1 1National Institute of Diagnostics and Vaccine Development in Infectious Diseases, School of Life Sciences, Xiamen University, Xiamen, 361102, China
Get PriceA copolymer of acrylamide (AM) with acryloyloxyethyl trimethyl ammonium chloride (DAC) as the cationic monomer was synthesized under the irradiation of high-pressure mercury lamp with 2,2-azobis(2-amidinopropane) dihydrochloride (V-50) as the photoinitiator. The compositions of the photoinduced copolymer were characterized by Fourier transform infrared spectra (FTIR), ultraviolet spectra (UV ...
Get Price1. Introduction Polycarbonate (PC), as a high-performance engineering plastic, has been widely used in compact disk manufacturing, glass assembly industry, automotive industry, medical equipment, food packaging, etc. 1 With the rapid growth of PC production and sales, more and more PC waste has been generated. Although this PC waste is non-toxic and harmless, it is bulky and difficult to ...
Get Price2018-10-17 · Chemicals. Poly-aluminum chloride (Al 2 (OH) n Cl 6−n.YH 2 O, Al 2 O 3 = 30%wt, basicity = 65% and pH = 3) was used as a coagulant and anionic (A 300), cationic (C 270) and nonionic polymers, as the coagulant aids were provided from AquaTech Company, Switzerland.. Preparation of solution. In order to prepare a 10 percent clear solution for coagulant, 10 g of PAC was dissolved to 100 mL of ...
Get Price2018-8-3 · When we used ferric chloride solution (0.1 M, Sigma Aldrich, USA) at 25 °C, instead of the APS to etch the Cu etch process, we observed that the etch rate was high, but the transferred graphene surface was contaminated by an iron-based residue [47, 48], as shown in the optical microscope images in figure S1(a). We also observed, in our ...
Get Price2009-1-8 · 3. The pH effect on grease and oil removal by ferric chloride coagulation The use of ferric chloride in the range of 0.5 – 10.0 g/L with uncontrolled pH showed an ineffective grease and oil demulsification. But when the ferric chloride was increased into the range of 1-1.5 g/L and pH was controlled at 5, the oil layer at water surface could ...
Get Price2020-7-29 · We believe that these conditions were a major factor in achieving the synthesis of [18 F]PSMA-1007 with high reproducibility using CFN-MPS200 in this study. Conclusion We have succeeded in the automated production of [ 18 F]PSMA-1007 injection solution for clinical use with a new cassette and optimized the synthesis procedure using a CFN-MPS200 ...
Get PriceThis study, therefore, investigated the effects of NaHCO3 ingestion on repeated 4 km TT cycling performance and post-exercise acid-base balance recovery in acute moderate hypoxic conditions. METHODS: Ten male trained cyclists completed four repeats of 2 × 4 km cycling time trials (TT1 and TT2) with 40 min passive recovery, each on different days.
Get Price2013-6-10 · The role of deformation-induced defects and carbon addition on the copper precipitation during aging at 550 °C is investigated in high-purity Fe-Cu-B-N-C alloy samples by Coincidence Doppler Broadening. In samples with 0% and 8% cold pre-strain, the influence of tensile pre-deformation on the precipitation kinetics of copper is studied.
Get Price2021-1-25 · In the current study, we sought to achieve a high production of PPV VLPs using a nonconventional yeast Kluyveromyces marxianus. This strain is an aerobic, Crabtree negative, and homothallic hemiascomycetous yeast that can generate energy from both respiratory metabolism and ethanol fermentation [ 25 , 26 , 27 ].
Get Price2021-2-1 · As is well-known, endo-1,4-β-xylanase and β-xylosidase are the rate-limiting enzymes in the degradation of xylan (the major hemicellulosic component), main functions of which are cleavaging xylan to release xylooligosaccharides (XOS) and xylose that these two compounds have important application value in fuel, food, and other industries. This study focuses on enzymatic hydrolysis of poplar ...
Get Price2021-4-20 · Pyomelanin is a polymer of homogentisic acid synthesized by microorganisms. This work aimed to develop a production process and evaluate the …
Get Price2021-3-12 · The only argument against crystalline Si as the ideal PV material both now and in the future pertains to the fourth criterion. That is, the availability, collection, and manufacture of crystalline Si are extremely problematic. More precisely, because Si in nature is found only as impure, oxidized sand (silica/SiO 2) or silicates (a salt with SiO 4–x (4–2x)–), the chemistries required for ...
Get Price2020-3-20 · Ammonium ferrous sulfate ((NH 4) 2 Fe(SO 4) 2 ·6H 2 O), ferric chloride (FeCl 3 ·6H 2 O), tetraethyl-orthosilicate (TEOS), ammonium hydroxide (NH 3 ·H 2 O), nickel sulfate (NiSO 4 ·6H 2 O), sodium hydroxide (NaOH), epichlorohydrin (ECH) and ethyl alcohol were purchased from Sinopharm Chemical Reagent Co., Ltd. Imidazole and sodium ...
Get Price2016-8-26 · Under the optimal conditions of a pulse duty cycle of 0.3, current density of 35 mA/cm 2, pulse frequency of 3.0 kHz, electrode distance of 1.0 cm, and reaction time of 40 min, the removal efficiencies of chemical oxygen demand (COD), oils and greases, turbidity, total suspended solids, and polyacrylamide reach 98.3, 99.0, 98.8, 98.1 and 94.3% ...
Get Price2021-7-3 · Full Article. Optimization of Selective Acid Hydrolysis of Cellulose for Microcrystalline Cellulose using FeCl 3. Jinbao Li, a,b, * Xiangrong Zhang, a, * Meiyun Zhang, a Huijuan Xiu, a and Hang He a,b In the process of acid hydrolysis of cellulose, hydrolyzing the amorphous regions while retaining the crystalline regions is the key technology for obtaining microcrystalline cellulose products.
Get PriceLactic acid production in Indonesia has not been able to meet the needs of the industry, especially as the raw material for biodegradable plastic/poly lactic acid (PLA), thus an inexpensive and abundant alternative material is needed, based on previous research, durian seed waste has the potential as a raw material to produce lactic acid by ...
Get Price2019-2-1 · Activated sludge process is one of the main widely used methods in domestic sewage and industrial waste water treatment currently. A large amount of residual sludge is produced during domestic sewage treatment with the activated sludge process (Tang & Zhang 2014).The residual sludge contains a lot of nutrients, such as nitrogen, phosphorus, and organic matter, and at the same time contains a ...
Get Price2012-7-26 · The optimal reaction conditions obtained are:FOP of the yield as 31% from PcCl, the mole ratio of PcCl to sodium nitrohydrofurazan 1.0∶1.1,reaction temperature 80℃,reaction time 16h,and for DFOP of the yield as 42% from DCPc, the mole ratio of DCPc to sodium nitrohydrofurazan 1.0∶2.7,reaction temperature 80℃,reaction time 2h. 23.
Get PricePretreatment. Myat et al. conducted a testing study to evaluate the pretreatment of oxidation and coagulation on ceramic microfiltration (CMF) and subsequently reverse osmosis (RO) in an advanced treatment train for water reuse.The use of coagulation with either ozone (O 3) or ultraviolet hydrogen peroxide (UV/H 2 O 2) and coagulation with poly aluminum chloride helped to sustain a high flux ...
Get Price2021-1-26 · 2.1. Optimization of Amidoximation Conditions in Aqueous Solution. To determine the optimal amidoximation parameters in aqueous solution (pH ∼7), the effects of NH 2 OH concentration, reaction temperature, and reaction time on the uranium adsorption capacities of AO-based sorbents in the U-spiked brine were investigated. As shown in Figure Figure2 2 a, the uranium adsorption capacity ...
Get Pricewhere dε is the mean energy given up by the ionizing radiation to the mass amounts dm of the substance interacting with this ionizing radiation.dm is emphasized to be very low but not so low that the mean energy dε given up by the radiation would undergo a significant fluctuation.. Absorbed dose is measured in Joule/kg. The SI unit measure for the absorbed dose is the gray (Gy):
Get Price2019-10-8 · The demand for fossil derivate fuels and chemicals has increased, augmenting concerns on climate change, global economic stability, and sustainability on fossil resources. Therefore, the production of fuels and chemicals from alternative and renewable resources has attracted considerable and growing attention. Ethanol is a promising biofuel that can reduce the consumption of gasoline in the ...
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