scholarly journals XYLANASE ACTIVITY OF ASPERGILLUS NIGER AT DIFFERENT ECOLOGICAL CONDITIONS

2021 ◽  
Vol 21 (2) ◽  
Author(s):  
Anjali Sharma ◽  
A.K. Jaitly ◽  
Tanuja Bhatt
Keyword(s):  
Rice Husk ◽  
Salt Concentration ◽  
Xylanase Activity ◽  
Malt Extract ◽  
Test Fungus ◽  
Activity Maximum ◽  
Different Temperatures ◽  
Husk Rice ◽  
Natural Carbon ◽  
Wheat Husk

Maximization of xylanase activity at different media, temperature, pH and salt concentration has been presented in this paper. YpSs, Czapek dox and Malt extract medium were taken for evaluation of optimum growth and activity. Amongst all tested media, YpSs showed the highest growth. Three different natural carbon substitute i.e., wheat husk, rice husk and sugarcane baggase were used for xylanase activity. Maximum enzyme activity was observed in test fungus at rice husk. Production and maximum xylanase activity at rice husk has been observed at different temperatures, pH and Salt concentrations. The highest xylanase activity has been observed on day 5 at temperature 32° C, pH 6.5 and salt concentration of 2%.

scholarly journals BIOMASSES AND XYLANASE PRODUCTION BY STRAINS OF PENICILLIUM ISOLATED FROM BRAZILIAN ATLANTIC FOREST

2009 ◽  
Vol 76 (3) ◽  
pp. 359-364
Author(s):  
S.M. Tauk-Tornisiel ◽  
M.C. Vallejo ◽  
J.C. Govone
Keyword(s):  
Carbon Source ◽  
Wheat Bran ◽  
Tap Water ◽  
Carbon Sources ◽  
Xylanase Activity ◽  
Nitrogen Sources ◽  
Solid Substrate ◽  
Xylanase Production ◽  
Activity Maximum ◽  
Different Temperatures

ABSTRACT Six Penicillium strains were isolated from soil at a depth of 0 15 cm in the Juréia-Itatins Ecology Station (JIES), in the São Paulo State, Brazil. They were evaluated for xylanase production under different temperatures and carbon sources. The best carbon source and temperature were first determined in an automated Bioscreen C system, verifying the growth of microorganisms. Liquid media containing tap water with 2% carbohydrate and/or 1% nitrogen sources were used. Afterwards, Penicillium citrinum, P. fellutanum, P. rugulosum and P. decumbens were cultivated in 250 mL Erlenmeyer flasks with 50 mL of culture medium containing tap water sole 2% carbon source (fructose, glucose, mannitol, sucrose or xylose) and 1% yeast extract as a nitrogen source at pH 5.0 and 28o C, with agitation of 150 rpm for 72 hours. These same strains, except P. decumbens, and P. purpurogenum were cultivated in solid substrate with wheat bran under the same environmental conditions to study the potential of xylanase activity. Maximum xylanase activity was observed in cultures with wheat bran, without the addition of any other carbon source, using inocula containing 1 x 107 spores.mL-1 (28o C, pH 5.0, 72 h). It can be concluded that P. fellutanum and P. citrinumare a good xylanase producers under the conditions of 28º C. The results of xylanase activity were 54% less at 28º C in liquid cultures media cultures than in solid substrate.

scholarly journals Development of Oxo-biodegradable Bio-plastics Film Using Agricultural By-product such as Corn Husk, Soybean Husk, Rice Husk and Wheat Husk

2014 ◽  
Vol 20 (3) ◽  
pp. 205-211 ◽  
Author(s):  
Young-Sun You ◽  
Mi-Kyung Kim ◽  
Myung-Jong Park ◽  
Sung-Wook Choi
Keyword(s):  
Rice Husk ◽  
Corn Husk ◽  
Husk Rice ◽  
Wheat Husk

scholarly journals GERMINATION AND VIGOUR IN SEEDS OF THE COWPEA IN RESPONSE TO SALT AND HEAT STRESS

2019 ◽  
Vol 32 (1) ◽  
pp. 143-151 ◽  
Author(s):  
Luma Rayane de Lima Nunes ◽  
Paloma Rayane Pinheiro ◽  
Charles Lobo Pinheiro ◽  
Kelly Andressa Peres Lima ◽  
Alek Sandro Dutra
Keyword(s):  
Salt Stress ◽  
Heat Stress ◽  
High Temperature ◽  
Low Temperature ◽  
Vigna Unguiculata ◽  
Salt Concentration ◽  
Dry Weight ◽  
Germination Percentage ◽  
Different Types ◽  
Different Temperatures

ABSTRACT Salinity is prejudicial to plant development, causing different types of damage to species, or even between genotypes of the same species, with the effects being aggravated when combined with other types of stress, such as heat stress. The aim of this study was to evaluate the tolerance of cowpea genotypes (Vigna unguiculata L. Walp.) to salt stress at different temperatures. Seeds of the Pujante, Epace 10 and Marataoã genotypes were placed on paper rolls (Germitest®) moistened with different salt concentrations of 0.0 (control), 1.5, 3.0, 4.5 and 6.0 dS m-1, and placed in a germination chamber (BOD) at temperatures of 20, 25, 30 and 35°C. The experiment was conducted in a completely randomised design, in a 3 × 4 × 5 scheme of subdivided plots, with four replications per treatment. The variables under analysis were germination percentage, first germination count, shoot and root length, and total seedling dry weight. At temperatures of 30 and 35°C, increases in the salt concentration were more damaging to germination in the Epace 10 and Pujante genotypes, while for the Marataoã genotype, damage occurred at the temperature of 20°C. At 25°C, germination and vigour in the genotypes were higher, with the Pujante genotype proving to be more tolerant to salt stress, whereas Epace 10 and Marataoã were more tolerant to high temperatures. Germination in the cowpea genotypes was more sensitive to salt stress when subjected to heat stress caused by the low temperature of 20°C or high temperature of 35°C.

scholarly journals Adsorption Studies of Cyanide (CN)- on Rice Husk Ash (RHA)

2011 ◽  
Vol 46 (1) ◽  
pp. 101-104 ◽  
Author(s):  
S Naeem ◽  
U Zafar ◽  
T Amann
Keyword(s):  
Rice Husk ◽  
Contact Time ◽  
Rice Husk Ash ◽  
Cyanide Solution ◽  
Adsorption System ◽  
Solution System ◽  
Adsorbate Concentration ◽  
Adsorption Data ◽  
Batch Technique ◽  
Different Temperatures

In this investigation, adsorption of cyanide has been studied by means of batch-technique. Percentage adsorption was determined for Rice Husk Ash (RHA)-Cyanide solution system as a function of i) contact time, ii) pH, iii) adsorbate concentration and iv) temperature. Adsorption data has been interpreted in terms of Freundlich and Langmuir equations. Thermodynamics parameters for the adsorption system have been determined at three different temperatures. The value of ΔH°=38.326KJ/mole and ΔG°=-6.117KJ/mole at 283°K suggest that the adsorption of cyanide on RHA is an endothermic and a spontaneous process.Key words: Cyanide; Rice husk ash (RHA); Adsorption Isotherms DOI: http://dx.doi.org/10.3329/bjsir.v46i1.3524 Bangladesh J. Sci. Ind. Res. 46(1), 101-104, 2011

scholarly journals Manurial amendments and source of water for supplemental irrigation of sawah-rice system influenced soil quality and rice yield

Agro-Science ◽  
2021 ◽  
Vol 20 (1) ◽  
pp. 95-102
Author(s):  
A.L. Nnadi ◽  
V.U. Ugwu ◽  
J.C. Nwite ◽  
S.E. Obalum ◽  
C.A. Igwe ◽  
...  
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Spring Water ◽  
Mineral Fertilizers ◽  
Small Scale ◽  
Rice Grain ◽  
Southeastern Nigeria ◽  
Supplemental Irrigation ◽  
Husk Rice ◽  
Poultry Droppings

Soil and water management research on adapting the promising sawah ecotechnology for lowland rice farming in West Africa has largely focused on the abundant inland valleys; floodplains which too represent a huge agricultural resource in the region have not been so involved. Sawah refers to a bunded, puddled and leveled basin for rice, with water inlets and outlets for irrigation and drainage, respectively. In conventional sawah, soil fertility is augmented using mineral fertilizers, with an option to harness lowland water resources for use in small-scale irrigation to create the so-called sawah typologies. In this study, we evaluated the effects of three manurial amendments (rice husk, rice-husk ash and poultry droppings, each at 10 t ha–1) and NPK 20:10:10 at 400 kg ha–1 interacting with source of water (spring or pond) used for supplemental irrigation of three sawah typologies in a floodplain in southeastern Nigeria. Plots amended with poultry droppings and supplemented with spring water recorded the overall best performance of the sawah-rice system; the control being the unamended non-supplemented (solely rainfed) plots recorded the worst. Rice-husk ash and rice husk enhanced soil pH and soil organic carbon, respectively. The three sawah typologies showed a consistent trend thus spring-supplemented ≥ pond-supplemented ≥ non-supplemented sawah. Rice grain yield was influenced by soil total nitrogen and the sum of the three plant-nutrient basic cations (K+ , Ca2+ and Mg2+), with the influence of K+ alone being the greatest. To enhance rice performance including grain yields in floodplain sawah, farmers should utilise poultry droppings as soil manure and spring water for supplemental irrigation.

scholarly journals Studies on Thermal Degradation Behavior of Siliceous Agriculture Waste (Rice Husk, Wheat Husk and Bagasse)

2015 ◽  
Vol 17 (3) ◽  
pp. 47-51 ◽  
Author(s):  
Syed H. Javed ◽  
Umair Aslam ◽  
Mohsin Kazmi ◽  
Masooma Rustam ◽  
Sheema Riaz ◽  
...  
Keyword(s):  
Thermal Degradation ◽  
Rice Husk ◽  
Acid Treatment ◽  
Proximate Analysis ◽  
Degradation Behavior ◽  
Agriculture Waste ◽  
Pure Silica ◽  
Thermal Degradation Behavior ◽  
Residual Weight ◽  
Wheat Husk

Abstract Various siliceous agriculture waste (SAW) such as rice husk, wheat husk and bagasse have been investigated to study their thermal degradation behavior using Thermogravimetric Analyzer (TGA) technique. The focus of this research is to conduct TGA of raw and acid treated (20% HCl & 1M H2SO4) SAW at heating rate 10°C/min in the atmosphere of nitrogen. The results were analyzed on the basis of thermograms and it was inferred that 24 hours soaking with 20% HCl prior to thermal degradation enhanced the percent weight loss. The process also improved the percentage of residual weight of SAW indicating the extraction of amorphous silica with increased purity. The effect of acid treatment was verified by determining chemical composition of SAW samples before and after soaking with 20% HCl. Proximate analysis, thermal degradation temperature ranges and percentage of residual weight at 800°C for each of rice husk, wheat husk and bagasse were also quantified to observe the thermal degradation behavior. XRF analysis was performed to observe the effect of acid treatment for extraction of pure silica.

Characterisation of silica derived from rice husk (Muar, Johor, Malaysia) decomposition at different temperatures

2016 ◽  
Author(s):  
M. A. Azmi ◽  
N. A. A. Ismail ◽  
M. Rizamarhaiza ◽  
W. M. Hasif. A. A. K. ◽  
H. Taib
Keyword(s):  
Rice Husk ◽  
Different Temperatures

Adsorption kinetics and isotherms of bioactive antioxidant quercetin onto amino-functionalized silica nanoparticles in aqueous ethanol solutions

2017 ◽  
Vol 41 (16) ◽  
pp. 8451-8458 ◽  
Author(s):  
Masoud Ghanimati ◽  
Morteza Jabbari ◽  
Ali Farajtabar ◽  
Sayyed Ahmad Nabavi-Amri
Keyword(s):  
Silica Nanoparticles ◽  
Rice Husk ◽  
Adsorption Kinetics ◽  
Aqueous Ethanol ◽  
Low Cost ◽  
Acid Leaching ◽  
Functionalized Silica ◽  
Different Temperatures ◽  
Kinetics And Isotherms ◽  
Functionalized Silica Nanoparticles

Nano-structural particles of silica were synthesized from low-cost rice husk by acid leaching and further annealing at different temperatures.

scholarly journals Adsorption of Flagyl on Prepared Ash from Rice Husk

2021 ◽  
Vol 22 (4) ◽  
pp. 11-17
Author(s):  
Haider Abbas ◽  
Ammar S. Abbas
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Primary Source ◽  
Alternative Methods ◽  
X Ray Diffraction ◽  
X Ray ◽  
Adsorption Data ◽  
Pseudo Second Order ◽  
Husk Rice ◽  
Increasing Temperature

In recent years, it has been evident that searching for alternative methods with low-price and eco-friendly features that produce high-quality adsorbents is in high demand. In the present work, Rice husk from Iraqi rice named (Amber) had been used as the primary source to produce rice husk ash (RHA) for the removal of the antibiotic metronidazole (Flagyl) from water. After optimum drying of rice husk, rice husk ash (RHA) was obtained at 600 °C using an electric oven. RHA has been investigated for properties using X-ray diffraction (XRD), porosity, and surface area (SA). The experimental work adsorption data were optimized to evaluate Langmuir and Freundlich constants. The thermodynamic parameters likely a change in Gipp's energy (ΔG), enthalpy (ΔH), and entropy (ΔS). The impacts of increasing temperature on adsorption capacity were investigated, and the results indicate that the pseudo-second-order kinetics model could be presented the dynamic adsorption data that it has. The resultant values for the heat of adsorption and the free energy indicated that adsorption of Flagyl is preferred at low temperatures.

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