Base de dados : LILACS
Pesquisa : B01.650.940.800.575.912.250.093.615 [Categoria DeCS]
Referências encontradas : 5 [refinar]
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Id: biblio-1254708
Autor: Putra, Meilana Dharma; Abasaeed, Ahmed E; Al-Zahrani, Saeed M.
Título: Prospective production of fructose and single cell protein from date palm waste
Fonte: Electron. j. biotechnol;48:46-52, nov. 2020. graf, tab.
Idioma: en.
Projeto: King Saud University.
Resumo: BACKGROUND: Fructose and single cell protein are important products for the food market. Abundant amounts of low-grade dates worldwide are annually wasted. In this study, highly concentrated fructose syrups and single cell protein were obtained through selective fermentation of date extracts by Saccharomyces cerevisiae. RESULTS: The effect of air flow (0.1, 0.5, 0.75, 1, 1.25 and 1.5 vvm) and pH (4.5, 4.8, 5, 5.3 and 5.6) was investigated. Higher air flow led to lower fructose yield. The optimum cell mass production of 10 g/L was achieved at air flow of 1.25 vvm with the fructose yield of 91%. Similar cell mass production was obtained in the range pH of 5.0­5.6, while less cell mass was obtained at pH less than 5. Controlling the pH at 4.5, 5.0 and 5.3 failed to improve the production of cell mass which were 5.6, 5.9 and 5.4 g/L respectively; however, better fructose yield was obtained. CONCLUSIONS: Extension of the modified Gompertz enabled excellent predictions of the cell mass, fructose production and fructose fraction. The proposed model was also successfully validated against data from literatures. Thus, the model will be useful for wide application of biological processes.
Descritores: Saccharomyces cerevisiae/fisiologia
Phoeniceae
Frutose/biossíntese
-Aerobiose
Conceitos Matemáticos
Fermentação
Resíduos de Alimentos
Concentração de Íons de Hidrogênio
Responsável: CL1.1 - Biblioteca Central


  2 / 5 LILACS  
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Id: biblio-1131883
Autor: Al-Khateeb, Suliman A; Al-Khateeb, Abdullatif A; Sattar, Muhammad N; Mohmand, Akbar S.
Título: Induced in vitro adaptation for salt tolerance in date palm (Phoenix dactylifera L) cultivar Khalas
Fonte: Biol. Res;53:37, 2020. tab, graf.
Idioma: en.
Projeto: National Science, Technology and Innovation Plan (NSTIP).
Resumo: BACKGROUND: Soil salinity causes huge economic losses to agriculture productivity in arid and semiarid areas world-wide. The affected plants face disturbances in osmotic adjustment, nutrient transport, ionic toxicity and reduced photosynthesis. Conventional breeding approaches produce little success in combating various stresses in plants. However, non-conventional approaches, such as in vitro tissue culturing, produce genetic variability in the development of salt-tolerant plants, particularly in woody trees. RESULTS: Embryogenic callus cultures of the date palm cultivar Khalas were subjected to various salt levels ranging from 0 to 300 mM in eight subcultures. The regenerants obtained from the salt-treated cultures were regenerated and evaluated using the same concentration of NaCl with which the calli were treated. All the salt-adapted (SA) regenerants showed improved growth characteristics, physiological performance, ion concentrations and K+/Na+ ratios than the salt non-adapted (SNA) regenerants and the control. Regression between the leaf Na+ concentration and net photosynthesis revealed an inverse nonlinear correlation in the SNA regenerants. Leaf K+ contents and stomatal conductance showed a strong linear relationship in SA regenerants compared with the inverse linear correlation, and a very poor coefficient of determination in SNA regenerants. The genetic fidelity of the selected SA regenerants was also tested using 36 random amplified polymorphic DNA (RAPD) primers, of which 26 produced scorable bands. The primers generated 1-10 bands, with an average of 5.4 bands per RAPD primer; there was no variation between SA regenerants and the negative control. CONCLUSION: This is the first report of the variants generated from salt-stressed cultures and their potential adaptation to salinity in date palm cv. Khalas. The massive production of salt stress-adapted date palm plants may be much easier using the salt adaptation approach. Such plants can perform better during exposure to salt stress compared to the non-treated date palm plants.
Descritores: Tolerância ao Sal/genética
Phoeniceae/genética
Aclimatação
-Técnica de Amplificação ao Acaso de DNA Polimórfico
Salinidade
Responsável: CL1.1 - Biblioteca Central


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Id: biblio-950827
Autor: Alkhateeb, Suliman A; Alkhateeb, Abdullatif A; Solliman, Mohei EL-Din.
Título: In vitro response of date palm (Phoenix dactylifera L) to K/Na ratio under saline conditions
Fonte: Biol. Res;48:1-9, 2015. ilus, graf, tab.
Idioma: en.
Projeto: King Faisal University.
Resumo: BACKGROUND: Salinity is a serious factor limiting the productivity of agricultural plants. One of the potential problems for plants growing under saline conditions is the inability to up take enough K+. The addition of K+ may considerably improve the salt tolerance of plants grown under salinity. It is assumed that increasing the K+ supply at the root zone can ameliorate the reduction in growth imposed by high salinity. The present study aims to determine whether an increase in the K/Na ratio in the external media would enhance the growth of date palm seedlings under in vitro saline conditions. METHODS: Date palm plants were grown at four concentrations of Na + K/Cl (mol/m³) with three different K/Na ratios. The 12 salt treatments were added to modified MS medium. The modified MS medium was further supplemented with sucrose at 30 g/l. RESULTS: Growth decreased substantially with increasing salinity. Growth expressed as shoot and root weight, enhanced significantly with certain K/Na ratios, and higher weight was maintained in the presence of equal K and Na. It is the leaf length, leaf thickness and root thickness that had significant contribution on total dry weight. Na+ contents in leaf and root increased significantly increased with increasing salinity but substantial decreases in Na+ contents were observed in the leaf and root with certain K/Na ratios. This could be attributed to the presence of a high K+ concentration in the media. The internal Na+ concentration was higher in the roots in all treatments, which might indicate a mechanism excluding Na+ from the leaves and its retention in the roots. K/Na ratios up to one significantly increased the leaf and root K+ concentration, and it was most pronounced in leaves. The K+ contents in leaf and root was not proportional to the K+ increase in the media, showing a high affinity for K+ uptake at lower external K+ concentrations, but this mechanism continues to operate even with high external Na+ concentrations. CONCLUSION: Increasing K/Na ratios in the growing media of date plam significantly reduced the absorption of Na+ less than 200 mM and also balance ions compartmentalization.
Descritores: Potássio/metabolismo
Sódio/metabolismo
Produtos Agrícolas
Salinidade
Phoeniceae/fisiologia
-Sacarose/farmacologia
Técnicas In Vitro
Compartimento Celular/fisiologia
Brotos de Planta/metabolismo
Raízes de Plantas/metabolismo
Folhas de Planta/metabolismo
Phoeniceae/crescimento & desenvolvimento
Absorção Fisico-Química
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: CL1.1 - Biblioteca Central


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Id: lil-775128
Autor: Alrumman, Sulaiman A..
Título: Enzymatic saccharification and fermentation of cellulosic date palm wastes to glucose and lactic acid
Fonte: Braz. j. microbiol;47(1):110-119, Jan.-Mar. 2016. tab, graf.
Idioma: en.
Resumo: Abstract The bioconversion of cellulosic wastes into high-value bio-products by saccharification and fermentation processes is an important step that can reduce the environmental pollution caused by agricultural wastes. In this study, enzymatic saccharification of treated and untreated date palm cellulosic wastes by the cellulases from Geobacillus stearothermophilus was optimized. The alkaline pre-treatment of the date palm wastes was found to be effective in increasing the saccharification percentage. The maximum rate of saccharification was found at a substrate concentration of 4% and enzyme concentration of 30 FPU/g of substrate. The optimum pH and temperature for the bioconversions were 5.0 and 50 °C, respectively, after 24 h of incubation, with a yield of 31.56 mg/mL of glucose at a saccharification degree of 71.03%. The saccharification was increased to 94.88% by removal of the hydrolysate after 24 h by using a two-step hydrolysis. Significant lactic acid production (27.8 mg/mL) was obtained by separate saccharification and fermentation after 72 h of incubation. The results indicate that production of fermentable sugar and lactic acid is feasible and may reduce environmental pollution by using date palm wastes as a cheap substrate.
Descritores: Celulases/metabolismo
Celulose/metabolismo
Geobacillus stearothermophilus/enzimologia
Glucose/metabolismo
Resíduos Industriais
Ácido Láctico/metabolismo
Phoeniceae/metabolismo
-Álcalis
Biotransformação
Fermentação
Concentração de Íons de Hidrogênio
Phoeniceae/efeitos dos fármacos
Temperatura
Responsável: BR1.1 - BIREME


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Id: lil-755836
Autor: Nancib, Aicha; Nancib, Nabil; Boubendir, Abdelhafid; Boudrant, Joseph.
Título: The use of date waste for lactic acid production by a fed-batch culture using Lactobacillus casei subsp. rhamnosus
Fonte: Braz. j. microbiol;46(3):893-902, July-Sept. 2015. tab, ilus.
Idioma: en.
Resumo:

The production of lactic acid from date juice by Lactobacillus caseisubsp. rhamnosus in batch and fed-batch cultures has been investigated. The fed-batch culture system gave better results for lactic acid production and volumetric productivity. The aim of this work is to determine the effects of the feeding rate and the concentration of the feeding medium containing date juice glucose on the cell growth, the consumption of glucose and the lactic acid production by Lactobacillus casei subsp. rhamnosus in fed-batch cultures. For this study, two concentrations of the feeding medium (62 and 100 g/L of date juice glucose) were tested at different feeding rates (18, 22, 33, 75 and 150 mL/h). The highest volumetric productivity (1.3 g/L.h) and lactic acid yield (1.7 g/g) were obtained at a feeding rate of 33 mL/h and a date juice glucose concentration of 62 g/L in the feeding medium. As a result, most of the date juice glucose was completely utilised (residual glucose 1 g/L), and a maximum lactic acid production level (89.2 g/L) was obtained.

.
Descritores: Técnicas de Cultura Celular por Lotes
Ácido Láctico/metabolismo
Lactobacillus casei/metabolismo
Lactobacillus rhamnosus/metabolismo
Phoeniceae/metabolismo
-Fermentação
Extratos Vegetais/metabolismo
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: BR1.1 - BIREME



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