Optimization of temperature

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  • Antifungal metabolites from rare actinomycetes have been found attractive for application due to its novelty, potency and environmental friendliness. Optimization of process variables for enhanced production of antifungal metabolite in Janibacter sp. RC18 was carried out in this study. One factor at a time (OFAT) was used for preliminary optimization of fermentation variables (time, temperature, initial pH, carbon and nitrogen sources).

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  • This study investigated the Photo-Fenton process in textile wastewater treatment by using textile synthesis wastewater made of Symafix Red Dye solution. The aim of the study was to investegate the factors that influent to the photo-Fenton process such as contact time, pH, H2O2 and Fe2+conectrations, and UVexposure in order to research the optimum values of this process.Treatment of textile wastewater was carried out at ambient temperature in a batch reactor.

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  • In this work, ultrasonic treatment was used for improving the catalytic activity of glucoamylase preparation Dextrozyme GA. The ultrasonic temperature, power and time were optimized by a Central Composite Circumscribed design for maximizing of the catalytic activity of the preparation.

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  • The process of enzyme assisted extraction of essential oil from the leaves and branches of the Vietnamese aromatic plant Cinnamomum cassia was studied and optimized using a Box-Wilson central composite design consisting of 05 independent variables (pH, temperature T, time τ, concentration of the enzyme Laccase, and concentration of the enzyme Cellic Htec2), and two dependent variables (reducing sugar and yield of essential oil).

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  • This research studied the juice extraction process from mangosteen peel with water solvent and the paramesters influencing on extraction process such as extraction temperature, extraction time and extraction ratio, and evaluating the juice of extract by determining extraction efficiency, color saturation of fabric and color fastness of silk fabric.

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  • This paper presents an electrothermally bimorph microgripper based on silicon-polymer laterally stacked structures and then optimized method for decreasing the maximum working temperature, improving temperature profile. The actuated displacement is enhanced due to the polymer constraint effect. Both the thermal expansion and apparent Young’s modulus of the constrained polymer blocks are significantly improved, compared with the no constraint one.

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  • The effects of four independent variables (pepsin enzyme content, acetic-acid concentration, liquid/solid ratio, and temperature) on the extraction yield of collagen from Pangasius hypophthalmus skin were evaluated. The optimal conditions to obtain the highest yield were determinded as follows: a pepsin enzyme content of 0.25%, a acetic-acid concentration of 0.75 M, a liquid/solid ratio of 80, a temperature of 13.9 oC. The predicted yield was 73% which was in agreement with the actual value (P

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  • The geometrical and electromagnetic variables of a rectangular-type magnetohydrodynamic (MHD) circulation system are optimized to solve MHD equations for the active decay heat removal system of a prototype Gen-IV sodium fast reactor. Decay heat must be actively removed from the reactor coolant to prevent the reactor system from exceeding its temperature limit. A rectangular-type MHD circulation system is adopted to remove this heat via an active system that produces developed pressure through the Lorentz force of the circulating sodium.

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  • Triblock copolymers were polymerised by the ringopening reaction of D,L-lactide in the presence of poly(ethylene glycol) (PEG), with number-average molecular weight (Mn ) of 1500 and 2050 g/mol, using Sn(Oct)2 as a catalyst. The influences of the reaction time, the ratio of PEG and Poly(D,L-lactic acid) (PLA), and PEG types on structure and sol-gel phase transition of PLA-PEG-PLA triblock copolymers were investigated. Optimal polymerisation parameters were obtained, such as reaction time of 18 hours, a catalyst amount of 1.3%, and PEG/PLA ratio of 1/1.

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  • The aim of this study was to isolate and optimize the growth conditions of thermophilic microorganism from hot springs. The isolation was conducted by using the mineral salt basal medium supplemented with 0.6% yeast extract at 500C. Totally, 33 isolates of thermophilic microorganism were isolated from hot springs at Truong Xuan (Khanh Hoa province) and Binh Chau (Ba Ria - Vung Tau province). The effects of temperature (45 - 800C), pH (pH 6 - 9) and carbon sources (malate, pyruvate, acetate, glucose, fructose, or carbon dioxide) on the growth of isolates were examined.

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  • In this study, factors affecting the extraction yield of carotenoids from dried shrimp waste by organic solvents have been studied. The results showed that the solvent ratio hexane: acetone = 3: 1 gave the highest carotenoid yield. At this ratio of solvent’s mixture, the carotenoid yield reached highest at temperature 60 C after 2 hours extraction, which was 44.64 µg/g raw shrimp waste (d.b.) (ratio of solvent to raw material 3/1). Ultrasound or vortexing gave higher extraction yield than in static conditions, which was 1.8- fold to 1.5- fold increase, respectively.

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  • Sorghum popps were developed with high temperature short time (HTST) popping process. The effect of process parameters viz. Soaking time (ST), Conditioning time (CT) and Popping temperature (PT) on the product quality was investigated by conducting experiments using Box Behnken Design (BBD). Linear and quadratic models were developed using response surface methodology (RSM) to study the synergy between process parameters and responses in terms of popping yield (PY), expansion ratio (ER), crispness (Csp), hardness (HRD) and colour L* value.

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  • The extraction conditions of polyphenols from Camellia dalatensis leaves were optimized by experimental design with five variables using Design-Expert V11.1.0.1 software. Using the methodology of response surface optimization, the optimal polyphenol extraction conditions were found to be an ethanol concentration of 49.29%, temperature at 60°C, a sonication time of 40min, a material size of 0.5mm, and a solvent/material ratio of 5.47.

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  • The study aimed at optimizing the mycelial biomass production of G. lucidum by submerged fermentation. Conventional one factor at a time was used as an initial screening process, i.e., one factor was varied, while keeping all the others constant. Different factors like pH, temperature, carbon source, nitrogen source and inoculum size were selected for the optimization process. The optimum pH and temperature of the medium was found to be 5 and 30°C respectively. Different carbon and nitrogen sources were screened for optimum mycelial biomass production.

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  • In this study, an excellent exopolysaccharide producing in house isolate i.e. Lactobacillus casei KL14 with accession number KX774469was used to optimize various independent factors i.e. incubation temperature, pH, carbon source, surfactant source and nitrogen concentration for enhanced exopolysaccharide production by One Factor at a Time (OFAT) approach.

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  • The results showed that the most appropriate drying conditions were at temperature of 560C, drying time of 210 min and wind speed of 0.24 m/s. The addition of sorbitol, glycerin, common salt in product was 4.37%, 1.93%, and 3.4%, respectively which were suitable for maintaining the aw of the product at 0.67 g.

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  • The present research was undertaken with an aim to isolate and characterize antifungal compounds from actinomycetes and optimization of cultural characteristics for production of bioactive metabolite by actinomycetes. Actinomycetes isolate ACITM-1 was further cultivated in different conditions fermentation in order to optimize biosynthetic process of antibiotic production including: different pH values, different temperatures, different carbon and nitrogen sources were fully investigates.

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  • Objective of the study is to enhance the productivity of pigmented compound of Streptomyces flavofuscus ARITM02 by optimizing its physiological conditions. Streptomyces flavofuscus ARITM02 was screened for its pigment producing ability. In order to improve its efficiency, the effects of various physiological conditions like, temperature, pH, incubation time, carbon and nitrogen sources were optimized and its productivity was examined by optical density measurement from UV-Vis spectrophotometer.

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  • Temperature rise due to climate change is expected to change pathogenicity of the pathogen. Temperature has a significant influence on growth and sporulation of rice leaf blast pathogen (M. oryzae). Both growth and sporulation were increased up to a temperature (27°C) and declined further in response to increased or decreased with temperature (32°C and 22°C). Various components of rice blast infection observed maximum at 27°C (optimal temperature) compared to suboptimal (22°C) and supraoptimal (32°C) i.e.

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  • Betalain is a pigment found in plants, can be red-violet (betacyanin) or yellow (betaxanthin), soluble in water, a compound widely used in chemistry, medicine and pharmacy with the chemical stability in a wide pH range. Betalain is an antioxidant with antiviral, antiinflammatory properties. They are found in high levels in red beetroot and are a food coloring additive. The aim of this work was to study factors affecting the extraction of betalain from red beetroots such as solvent type, solvent concentration, material-solvent ratio, temperature and time.

    pdf10p kequaidan8 02-11-2020 1 0   Download



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