Extraction time
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In the present study, out of 22 Streptomyces strains, Streptomyces parvulus VCCM 22513 produced the highest chitinase activity. Time courses of incubation revealed that the maximum chitinase (0.91 ± 0.04 U/mL) of this strain was observed after 96 hours in the yeast extract salts medium supplemented with 10.0 g/L colloidal chitin.
10p dianmotminh02 03-05-2024 11 1 Download
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The present study investigated the phytochemical and biological properties of the rhizomes C. aromatica. From the CHCl3 extract of C. aromatic rhizomes, six known compounds, including (-)-hannokinol, (3R,5R)-3,5-diacetoxy-1,7-bis(4- hydroxyphenyl)heptane, naringenin, 2-(4- (hydroxymethyl)phenyl)propan-2-ol, 5-hydroxymethylfurfural, and bisacurone, were isolated. All compounds were tested on the biological inhibitory activities against tyrosinase, αglucosidase, and urease. It was the first time all compounds were isolated from rhizomes of C. aromatica Salisb.
6p dianmotminh02 03-05-2024 4 3 Download
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The current study sought to determine: If there is a correlation between conventional measures of lung function such as Forced Expiratory Volume in one second (FEV1) and less conventional measures such as airways expired NO level (eNO), electrodermal measures, TCM enquiry and BHT; If any of the lung function measures are able to distinguish between asthmatic and healthy subjects; If the use of a rye grass extract is better than placebo in improving requirements for bronchodilator medication, peak flow, forced expiratory volume in one second or quality of life in mild to moderate childhood a...
262p runthenight05 01-03-2023 7 5 Download
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The timing of the deposition of the well-preserved Quaternary marine terraces in the coastal region of northeastern Turkey are crucial in understanding the Quaternary tectonics of the Pontides. The chronology of raised marine terraces between Trabzon and Rize has remained unrevealed because of chronologic limitations. This study aims to establish chronology for the terrace deposits by applying optically stimulated luminescence (OSL) dating methods using single aliquot regenerative dose (SAR) techniques on quartz grains extracted from marine terraces.
20p tanmocphong 29-01-2022 21 1 Download
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Classification of rocks is one of the basic parts of geological research and is a difficult task due to the heterogeneous properties of rocks. This process is time consuming and requires sufficiently knowledgeable and experienced specialists in the field of petrography. This paper has a novelty in classifying plutonic rock types for the first time using thin section images; and proposes an approach that uses the deep learning method for automatic classification of 12 types of plutonic rocks.
10p tanmocphong 29-01-2022 13 1 Download
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We have studied the spatiotemporal evolution of surface deformation in Konya city and its vicinity using advanced multitemporal synthetic aperture radar techniques with SAR data acquired by Envisat, ALOS-1, and Sentinel-1 A/B satellites between 2004 and 2020. Velocity maps and time series show that the city has been subsiding with varying rates in space and time since 2004. The pattern of deformation shows two main lobes of subsidence centered in the western and eastern sides of the city with a nondeforming north-south trending narrow zone in between.
17p tanmocphong 29-01-2022 7 0 Download
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Lithium (Li) is the lightest metal, has unique physicochemical properties and is the main component of lithium-ion batteries. Rechargeable lithium-ion batteries play a very important role in maximizing the performance of electric devices and vehicles. It is predicted that the metal and mineral demand for lithium-ion batteries will increase 56 times by 2050. In order to meet the increasing demand, in addition to known methods, lithium recovery from geothermal waters has become a very popular research subject.
13p tanmocphong 29-01-2022 24 2 Download
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The goal of the thesis: Determine the time of harvesting the natural growing Dangshen roots; research on inulin extraction, purification, and characterization of inulin molecular structure in Dangshen tubers naturally growing in Lac Duong district, Lam Dong province; research on spray drying to create Dangshen powder and experiment to create a synbiotic powder from spray-drying powder, oriented application in food.
33p guitaracoustic09 14-01-2022 26 1 Download
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Green synthesis method is being increasingly used in the development of safe, stable, and eco-friendly nanostructures with biological resources. In this study, extracellular and intracellular synthesis of gold nanoparticles (AuNPs) was carried out using green algae Chlorella sorokiniana Shihira & R.W. Fresh algae were isolated and identified from Musaözü Pond located in the province of Eskişehir and then extraction process were performed.
18p thiencuuchu 27-11-2021 8 2 Download
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This project proposes two new methods of deep neural networks and handcrafted features for damage detection. The first method uses a convolution neural network (CNN) to extract deep features in time series and Long Short Term Memory (LSTM) network to find a statistically significant correlation of each lagged feature in time series data.
6p billyelliot 11-11-2021 27 1 Download
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Response surface methodology was applied to optimize the extraction of phenolic compounds from fresh Pouzolzia zeylanica plant using hot water as a solvent. A central composite design (CCD) in form (23+star) was used to investigate the effects of two independent variables, namely, extraction temperature (70 to 90oC) and extraction time (20 to 40 min).
10p larachdumlanat129 19-01-2021 19 2 Download
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Smilax glabra Roxb. is a medicinal plant of Vietnam to treat several diseases such as: Piercing pain in the bones, detoxicating, scabies, nephritis, cystitis, syphilis,... From ethanol extracts of Smilax glabra Roxb. cultivating in Thai Nguyen, 5 compounds were isolated and structurally elucidated in the first time by various spectral methods, such as IR, MS, 1H-NMR, 13C-NMR, DEPT, HSQC, HMBC.
9p larachdumlanat127 20-12-2020 15 2 Download
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Investigation on the chemical constituents of ethyl acetate extract from leaves of Taxus wallichiana Zucc. (Taxaceae), collected in Ha Giang province, has resulted in the isolation of three metabolites for the first time: sciadopitysin (1), β-sitosterol (2), and isoquercitrin (3). Their structures were determined by spectroscopic methods.
6p koxih_kothogmih5 04-09-2020 25 2 Download
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Deproteinated cheese whey was used for biomass production of probiotic strain Lactobacillus helveticus MTCC 5463 in a biofermenter. Optimization of growth parameters such as temperature, pH and time of incubation as well as nutrient supplementation of cheese whey was carried out using response surface methodology (RSM). Cheese whey supplemented with 0.95% yeast extract and 0.95% proteose peptone, inoculated with 6% (v/v) active culture of L. helveticus MTCC 5463 and fermented for 24 h at optimized temperature of 40ºC and pH 6.25 yielded 3.25 g/L dry cell biomass and 14.
14p chauchaungayxua6 26-06-2020 24 2 Download
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Scenario studies simulate the whole fuel cycle over a period of time, from extraction of natural resources to geological storage. Through the comparison of different reactor fleet evolutions and fuel management options, they constitute a decision-making support.
15p christabelhuynh 30-05-2020 19 1 Download
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From the methanol extract of the leaves of Desmodium gangeticum collected in Me Linh, Ha Noi, we isolated 5 compounds. In which, there are four glycosides including (6S,9R)- roseoside (1), kaempferol-3-O-rutinoside (nicotiflorin) (2), quercetin-3-O-rutinoside (rutin) (3), β-sitosterol-3-O- β-D-glucopyranoside (4), and the other is protocatechuic acid (5). Kaempferol3-O-rutinoside (2) was isolated from Desmodium gangeticum for the first time while (6S,9R)- roseoside (1) was isolated from the genus Desmodium for the first time. Their structures were determined by 1D and 2D NMR spectra.
5p abcxyz123_02 03-03-2020 17 2 Download
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Luận án đề xuất một phương pháp thu giảm số chiều mới thỏa điều kiện chặn dưới và có thể kết hợp với một cấu trúc chỉ mục đa chiều hỗ trợ việc tìm kiếm tương tự hữu hiệu, ứng dụng phương pháp đề xuất vào bài toán phát hiện motif theo hướng tiếp cận xấp xỉ, ứng dụng phương pháp đề xuất vào bài toán gom cụm theo phương pháp gom cụm có thời gian thực thi tùy chọn, ứng dụng phương pháp đề xuất vào bài toán tìm kiếm tương tự trên chuỗi thời gian dạng luồng và ứng dụng phương pháp thu giảm số chiều đã đề xuất vào bài toán dự báo dữ liệu chuỗi thời gian có tính xu hướng hoặc mùa.
32p covid19 02-03-2020 43 5 Download
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Three natural compounds including betulin (1), betulinic acid (2) and lupeolactone (3) were isolated from the dichloromethane extract of Helicteres hirsuta Lour. for the first time. Their structures have been elucidated by modern spectroscopic methods as IR, 1H-NMR, 13C-NMR, DEPT, HSQC, HMBC, MS and by comparison with those of previously reported data.
8p slimzslimz 08-12-2019 37 0 Download
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The fluence-dependent photodissociation experiments show that the V19+ clusters prefer the evaporation of vanadium dimers rather than monomers. This finding is in line with dissociation energies extracted from early collision-induced dissociation data.
7p thithizone 16-07-2019 11 0 Download
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The Central Statistics Office has registered increased availability in part-time courses in Ireland over recent years. This study aims to investigate the motivators driving part-time study and the impact studying part-time has on professional and personal lives of full-time employees in Ireland. Utilising a qualitative research approach, data was collected using open ended, semi-structured interviews on six desirable participants and examined using thematic analysis. Extracted information was interpreted and discussed.
50p nguyenyenyn117 18-06-2019 34 7 Download