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Mar 29, 2021Open    AccessArticle

Production of α-Amylase by Bacillus subtilis QM3 and its Enzymatic Properties

Qingping Hu, Jingjing Liu
Alpha-amylase is a starch hydrolyzing enzyme which has many industrial applications. In this study, Bacillus subtilis QM3 has ability to produce α-amylase. Identification was done by iodine test, based on the clear zone around the sample in starch agar plates. Alpha-amylase activity was measured using 3,5-dinitrosalicylic acid (DNS). The result showed B. subtilis QM3 can produce α-amylase and activity of α-amylase was 50.58 IU/mL. The study on enzymatic properties was found: the optimum temperat...
Open Access Library J. Vol.8, 2021
Doi:10.4236/oalib.1107291


Mar 22, 2021Open    AccessArticle

Study on the Adsorption of Heavy Metal by Extracellular Polymeric Substances Extracted from Proteiniphilum acetatigenes PSB-W

Qingping Hu, Xiaoqi Liu
The negatively charged coordination groups on the structure of these biomolecules, which is the main components of extracellular polymeric substances (EPS), have good adsorption efficiency for heavy metals. In this paper, EPS form Proteiniphilum acetatigenes PSB-W which was extracted by EDTA method, and the effects of pH, EPS dosage, adsorption time and initial metal concentration on the adsorption regularity of Cu2 and Pb2 ions on EPS structure were studied respectively, as well as the adsorp...
Open Access Library J. Vol.8, 2021
Doi:10.4236/oalib.1107228


Nov 27, 2020Open    AccessArticle

Response Surface Methodology to Optimize Degradation on Phenol by Pseudomonas stutzeri ZH-1

Yong Yan, Qingping Hu
In order to obtain the optimal conditions for the degradation of phenol by Pseudomonas stutzeri ZH-1, based on the single factor experiment, the Box Behnken design test of Response Surface Method was used. Four variables of glucose concentration (0.4, 0.6, 0.8 g/L), inoculation concentration (3%, 5%, 7%), pH (6, 7, 8) and temperature (35°C, 37.5°C, 40°C) were used to identify the significant effects and interactions in the batch studies. A second order polynomial regression mo...
Open Access Library J. Vol.7, 2020
Doi:10.4236/oalib.1106952


Jul 10, 2020Open    AccessArticle

Estimation of the Randomness of Heart Rhythm Using Fractal Characteristics

Abdullaev Namik Tahir, Ibrahimova Irada Javad
The article discusses the characteristics of the fractality of heart rate variability represented by a time series. An algorithm for calculating the Hurst exponent is presented, which allows one to evaluate the degree of chaotization of the signal in question. The capabilities of various multifractal analysis programs are shown, which require the use of different mathematical models.
Open Access Library J. Vol.7, 2020
Doi:10.4236/oalib.1106444


Jun 24, 2020Open    AccessArticle

Study on Preparation of Bio-Oil from Wheat Straw by Hydrothermal Liquefaction

Dongyu Guo, Jun Wang
Wheat straw is an ideal green renewable resource, which is widely used as fertilizers, feedstuffs, edible funguses, industrial raw materials and fuels. Hydrothermal liquefaction of biomass that works under normal or slightly pressurized conditions results in higher oil quality. We summarize the technical principles of hydrothermal liquefaction, analyze the difficulties and problems in the utilization of various technologies, and put forward the development trend of promoting the application of b...
Open Access Library J. Vol.7, 2020
Doi:10.4236/oalib.1106500


May 29, 2020Open    AccessArticle

Effects of Light on Saccharide Wastewater Treatment and Resource Recovery by Proteiniphilum acetatigenes PSB-W

Qingping Hu, Xiaoli Gao
Photosynthetic bacteria (PSB) wastewater treatment is a new method with great resource recovery potential. In order to improve the biomass and valuable resources of bacteria in the wastewater treatment of photosynthetic bacteria, the effects of different light conditions on the efficiency of Proteiniphilum acetatigenes PSB-W in the treatment of sugar wastewater and the production of bacteria and carotenoids in the wastewater were analyzed from three aspects of light source, light intensity and l...
Open Access Library J. Vol.7, 2020
Doi:10.4236/oalib.1106348


Jan 09, 2020Open    AccessArticle

Removing Antibiotic-Resistant Bacteria (ARB) Carrying Genes (ARGs): Challenges and Future Trends

Djamel Ghernaout, Noureddine Elboughdiri
Developed control of chemical disinfection techniques is beginning to be pro-gressively significant in order to equilibrate under-treatment (minimal pathogen demobilization) and over-treatment (immoderate consumption of disinfectant and disinfection by-products generation) that way giving great ecological and economic advantages. This work reviews the most recent and pertinent re-searches in this field of eliminating Antibiotic-re
...
Open Access Library J. Vol.7, 2020
Doi:10.4236/oalib.1106003


Dec 19, 2019Open    AccessArticle

Pharmacognostic, Physicochemical and Phytochemical Analysis of Two Cultivars from Hibiscus sabdariffa L. in Cuba

Francis Brown, José González, Max Monan
Roselle (Hibiscus sabdariffa L.) is an edible plant used in various applications including foods. Among them, the most popular are the fleshy red calyces used for making wine, juice, jam, syrup, pudding, cakes, ice cream or tea. Roselle flower and calyces are also known for its antiseptic, diuretic, antioxidant and antimutagenic properties. In order to offer aspects related to the quality and effectiveness of the
...
Open Access Library J. Vol.6, 2019
Doi:10.4236/oalib.1105894


Dec 18, 2019Open    AccessArticle

Effect of Different Drought Stress on Seedling Growth and Physiological Characteristics of Cenchrus pauciflorus Benth

Ye Jiang, Tiange Cai, Fengde Tang
As a kind of invasive alien plants, the Cenchrus pauciflorus Benth. is spreading in the range of sandy grassland in Liaoning, which reduced the biodiversity of grassland, and greatly affected the ecological environment of grassland. It is of great significance to understand the distribution of biomass and physiological characteristics in the management of grassland and the improvement of the ecological environment of the grassland
...
Open Access Library J. Vol.6, 2019
Doi:10.4236/oalib.1105933


Nov 26, 2019Open    AccessArticle

Determination of Theobromine and Caffeine in Theobroma cacao Husk from Ethanolic Extract by GC-MS after CC Separation

José González, Max Monan, Julio Perez, Enrique Gómez, Damaris De La C. Salgado, Danae Pérez
After CC separation of 21 samples from Theobroma cacao Husk was analyzed by GC-MS, from ethanolic extract at 90% was recovered a solid residue of 1 g after several days on the table of the Lab. This main residue (300 mg) was analyzed after successive separations with mixtures of CHCl3: MeOH (7:3) and CHCl3: MeOH (5:5) in CC using Sílica Gel G 60-120 Mesh. All samples were analyzed by TLC on silica gel with fluorescent indicator 25
...
Open Access Library J. Vol.6, 2019
Doi:10.4236/oalib.1105771


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