Journal of Current Science and Technology最新文献

{"title":"Catalytic Oxidation Process and Thermal Characteristics of Toluene and Butyl Acetate Vapor in an Oven","authors":"Kenichiro Inoue","doi":"10.59796/jcst.v14n1.2024.17","DOIUrl":"https://doi.org/10.59796/jcst.v14n1.2024.17","url":null,"abstract":"Toluene vapor and butyl acetate vapor were oxidized at 523 K in an oven using the Pt/Co3O4-CeO2, Pt/Al2O3, and Co3O4-CeO2 catalysts and a comparison of activity and thermal characteristic among three different catalysts was conducted. The conversion into CO2 was estimated from the change in temperature of a catalyst bed during the oxidation reaction. A relation between heat capacity of the gas and amount of solvent molecule oxidized was clarified. In the oxidation with Pt/Al2O3 catalyst, the butyl acetate could not be completely oxidized, and part remained. Butanol and butanal were formed as by-products of the butyl acetate in the oven, which contained moist air. In the oxidation with Co3O4-CeO2 catalyst, although no butyl acetate remained, some toluene remained and the amount of butanol and butanal increased somewhat after passage over the catalyst bed. By using a catalyst that combined platinum and Co3O4-CeO2 with the original method, both the toluene and butyl acetate were almost completely oxidized at 523 K.","PeriodicalId":36369,"journal":{"name":"Journal of Current Science and Technology","volume":"22 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138594500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electrospun Cellulose Acetate Nanofibers Containing Clinacanthus nutans (Phayayo) Crude Extract as Potential Wound Dressings","authors":"Chanakan Sukmongkolwongs, Pornutcha Sawasiticher, Patcharaporn Wutticharoenmongkol","doi":"10.59796/jcst.v14n1.2024.7","DOIUrl":"https://doi.org/10.59796/jcst.v14n1.2024.7","url":null,"abstract":"Extraction of Clinacanthus nutans (Burm.f.) lindau (C. nutans) or Phayayo (PY) leaves was performed by maceration using ethanol as an extractant. The antioxidant activity was evaluated by a 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging assay. The inhibitory concentration at 50% antioxidant activity (IC50) of PY extract was 15.62 mg/mL. The electrospun cellulose acetate (CA) nanofibers containing PY extract at concentrations of 2.5, 5, and 7.5% w/v and silver (Ag) nanoparticles at 0.1% w/v were fabricated. The addition of PY extract and Ag influenced the viscosities of solutions and therefore affected the morphology and fiber diameters. The electrospun CA fiber mat containing 0.1% Ag and 7.5% PY extract was chosen to investigate its potential for use in wound dressing applications. The degrees of weight loss and water swelling of the electrospun CA/PY7.5/Ag fiber mat after immersion in a phosphate buffer solution (pH 7.4) at 37°C were examined in a range of 2-24 h, and found to increase with immersion time. The antioxidant activity of the fiber mat at the same period of immersion time was also studied, which corresponded with the trends of weight loss and water swelling. The antioxidant activity at 24 h of immersion was 68.3±9.2%. The CA/PY7.5/Ag fiber mat had no antibacterial activity against Escherichia coli but slightly inhibited the growth of Staphylococcus aureus. The fiber mat also possesses high hydrophilicity, as examined by the contact angle measurement. These results indicate that the CA/PY7.5/Ag fiber mat is a promising material for use as a topical transdermal patch or wound dressing.","PeriodicalId":36369,"journal":{"name":"Journal of Current Science and Technology","volume":"19 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138596066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Optical Properties Characterization of Hydrogenated Silicon by Spectroscopic Ellipsometry for Solar Cell Applications","authors":"Araya Mungchamnankit, P. Limnonthakul","doi":"10.59796/jcst.v14n1.2024.11","DOIUrl":"https://doi.org/10.59796/jcst.v14n1.2024.11","url":null,"abstract":"Amorphous and microcrystalline silicon play a critical role as layers in solar cell design, specifically in the absorption process layer which is crucial for the efficiency of sunlight conversion. This study explores the creation of hydrogenated amorphous silicon films (a-Si:H) via very high-frequency plasma-enhanced chemical vapor deposition (VHF-PECVD) and analyzes their optical properties and crystal structure. We determine the optical band gap of amorphous silicon using a Tauc plot and Spectroscopic Ellipsometry (SE) analysis of transmittance results. By comparing the data, we gain insights into the material's optical properties, aiding our understanding of the findings and enabling a swift evaluation of its optical band gap. Furthermore, we characterize the film's crystal structure using grazing X-ray diffraction. Our results reveal that a-Si:H on glass, produced by VHF-PECVD at a substrate temperature of 200°C with various hydrogen dilutions (RH=H2/SiH4) ranging from 1.0 to 5.0, remains in the amorphous phase. The SE modeling provides the optical band gap of the a-Si:H film, with the lowest and highest optical band gap values occurring at RH 1.0 (1.79 eV) and RH 3.0 (1.84 eV), respectively. We employed the Tauc-Lorentz model with five fitting parameters to extract optical properties and the band gap of amorphous silicon, including the real part of the dielectric function. This model incorporates three layers: the interface layer between the glass substrate and a-Si:H, the a-Si:H film, and surface roughness, yielding the most accurate model. This comprehensive analysis unveils the exact optical properties of the fabricated films, offering valuable insights for solar cell design and manufacturing. This research confirms that Spectroscopic Ellipsometry, a rapid and non-destructive method for measuring the optical band gap, can significantly benefit the solar cell fabrication industry.","PeriodicalId":36369,"journal":{"name":"Journal of Current Science and Technology","volume":"42 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138595777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison Study of Phagocytosis Activity among Live Candida albicans, Live and Heat-treated Saccharomyces cerevisiae","authors":"Wimol Chobchuenchom","doi":"10.59796/jcst.v14n1.2024.16","DOIUrl":"https://doi.org/10.59796/jcst.v14n1.2024.16","url":null,"abstract":"Fungi and yeast can stimulate neutrophil activity through phagocytosis mechanism that can cause inflammation and pathogenesis. The activation of neutrophil phagocytosis by baker’s yeast that was heated at baking temperature has not yet been clearly defined. This study aimed to compare the phagocytosis activity among live Candida albicans (CL), live Saccharomyces cerevisiae (SL) and Saccharomyces cerevisiae that was heated at baking temperature (SH). Phagocytosis activity was assessed by mixing whole blood from 30 healthy volunteers with normal white blood cells and absolute neutrophil counts with a yeast suspension adjusted to an absorbance of 600 nm at 5. The phagocytosis percentage and phagocytosis indexes were determined at 0, 5, 10, 15, 20, 25 and 30 minutes of incubation. At 25 minutes of incubation, it was found that the median [interquartile range] of phagocytosis percentage against CL, SL and SH were 90.0 [85.0-97.0] %, 84.0 [78.0-91.0]% and 43.0 [28.0-74.5]%, respectively. The median [interquartile range] of phagocytosis index against CL, SL and SH were 2.62 [1.83-3.26], 1.90 [1.46-2.14] and 0.57 [0.40-1.48], respectively. The phagocytosis percentage and index between CL versus SL, CL versus SH and SL versus SH were significantly difference (p-value < 0.05). This suggested that Saccharomyces cerevisiae with heat-treated at baking temperature was still capable to stimulate phagocytosis, although the phagocytosis percentage and phagocytosis index of both of these live yeast cells were significantly higher.","PeriodicalId":36369,"journal":{"name":"Journal of Current Science and Technology","volume":"37 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138597909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wire Electric Discharge Machining of Aluminium Hybrid Composite: Renewable Energy Based IoT Approach","authors":"Sreeram Hariharan, Uthayakumar Marimuthu, T. Sundaresan, Suresh Kumar Shanmugam, Rajesh Kanna Govindhan Radhakrishnan, Darius Mierzwinshi, Janusz Walter","doi":"10.59796/jcst.v14n1.2024.12","DOIUrl":"https://doi.org/10.59796/jcst.v14n1.2024.12","url":null,"abstract":"Wire Electric Discharge Machining (WEDM) has been recognized as one of the optimum methods for machining of harder aluminum-based hybrid metal matrix composites (AHMMC). This method is used to optimize the major control aspects of a machine and they are current, pulse duration, and rate of feed of wire on kerf width (KRW) and Surface roughness (Ra) of hybrid composites made of aluminum Al6351 as the metal matrix (AMMHC). The AMMHC has been created via a stir casting technique by adding SiC and B4C with an Al6351 matrix. Box-Behnken design (BBD) has been used to conduct tests in order to parametrically optimize the WEDM process. The optimization of KRW and Ra is identified using 3-D surface plots, graphs and response table of ANOVA as well as by employing Response Surface Methodology (RSM). Internet of Things (IoT) is implemented to monitor the quality of electrolyte that is used in WEDM. It has been identified that the current has a major contribution in both KRW and Ra factors. A lower current is preferred for a lower KRW whereas higher current improves Ra value.","PeriodicalId":36369,"journal":{"name":"Journal of Current Science and Technology","volume":"17 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138594346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Compressive Force Upregulates Notch Target Genes and NOTCH2 mRNA in Human Dental Pulp Cells","authors":"Hataichanok Charoenpong, Khitparat Kamoltham, Suchada Limsiriwong, Rutapakon Insawak, Apichart Veerawattanatigul, Sirawish Lertchatripong","doi":"10.59796/jcst.v14n1.2024.14","DOIUrl":"https://doi.org/10.59796/jcst.v14n1.2024.14","url":null,"abstract":"Dental pulp cells encounter compressive force in various situations. While mechanical force can produce various effects on dental pulp cells, the mechanisms underlying their response remain unclear. In this study, we examined the mRNA expression of Notch target genes and Notch receptors in human dental pulp cells (HDPCs) under mechanical compressive force. We utilized two in vitro compressive force application models, direct compression and hydrostatic compression. The results showed that there was an upregulation of Notch target gene, HES1, in HDPCs subjected to the compressive force generated by both models for 2 hours. Hydrostatic compression also upregulated HES1 and HEY1 mRNA expression following 6 hours of force application. NOTCH2 was the only Notch receptor found to be upregulated in HDPCs following compressive force application, in which the upregulation was observed at 6 hours after hydrostatic compression. In conclusion, both hydrostatic and direct compressive forces can upregulate the mRNA expression of Notch target gene, HES1, in HDPCs. However, the hydrostatic compression model produced more prolonged activation of HES1 and it also stimulated the upregulation of HEY1 as well as NOTCH2.","PeriodicalId":36369,"journal":{"name":"Journal of Current Science and Technology","volume":"67 27","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138594859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Production of Kaeng Liang Soup (Thai Style Spicy Mixed Vegetable Soup) Powder Using Foam-mat Drying","authors":"Satitpong Munlum, M. Junsi","doi":"10.59796/jcst.v14n1.2024.13","DOIUrl":"https://doi.org/10.59796/jcst.v14n1.2024.13","url":null,"abstract":"Kaeng Liang is an ancient local Thai soup that has been reported to have many benefits along with the popularity of powdered food seasonings having increased significantly in Thailand. The aim of this study was to investigate the factors affecting the foam-mat drying of Kaeng Liang soup powder. The physical, chemical, microbiological, nutritional, and sensory properties of the sample were studied. Three Kaeng Liang soup recipes were selected to study sensory acceptability. The best formula was selected to produce Kaeng Liang soup powder by foam-mat drying. Then, the optimum level of egg white protein (EWP) at three levels namely 2%, 4%, and 6% for use in foam-mat drying was studied. The best level condition of egg white power was selected to study drying at 60°C, 70°C, and 80°C further. It was shown that using 6% EWP and drying at a temperature of 80°C for 480 min meant that the water activity content was in accordance with the standards set forth in the instant community product standards, including the water solubility index and water reabsorption index. Moreover, the microbiological qualities are in accordance with the community product standards. As for the nutritional value of Kaeng Liang soup powder, it contains carbohydrates, proteins, fats, phosphorus, and calcium respectively. The acceptance of the product by 100 consumers was established by the high sensory score in the range of extremely liked as a score of 3.82-3.91 (1-dislike extremely to 5-like extremely). Therefore, the application of foam-mat drying can be used to produce Kaeng Liang soup powder.","PeriodicalId":36369,"journal":{"name":"Journal of Current Science and Technology","volume":"44 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138597483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Growth and Physiological Responses of Maize (Zea mays L.) under Drought Stress at Different Development Stages","authors":"Artit Pongtip, P. Thobunluepop, S. Nakasathien, P. Kongsil, E. Sarobol, W. Chitbanchong, Elke Pawelzik","doi":"10.59796/jcst.v14n1.2024.15","DOIUrl":"https://doi.org/10.59796/jcst.v14n1.2024.15","url":null,"abstract":"Drought stress was a main problem of maize production in Thailand. This study aimed to evaluate the effect of drought stress at different development stages and maize varieties (Zea mays L.) on growth, physiological responses, and grain yield to maintain maize production. The experiment was arranged in split-plot in a Randomized Completely Block Design (RCBD) with four replications. The main plot was control (well-watered) and drought stress at different development stages (the vegetative phase (V5), before the reproductive phase (V12), and the grain filling phase (R3)). The sub-plot consisted of four maize varieties: TS1004, NS3, SW4452, and NK6248. Drought stress during the vegetative phase (V5) and before the reproductive phase (V12) was found to be a susceptible stage for maize because grain yield (GY) was decreased by the loss of crop growth rate (CGR) and total soluble sugar content (TSC) and it accumulated proline content. The NK6248 variety was found to be the most suitable for maize production because it had the highest grain yield (GY) and crop growth rate (CGR). In addition, it had low proline content (PC) under drought stress. In summary, under drought stress, it is advisable to select the NK6248 variety for crop production and avoid drought stress in the vegetative phase (V5) and before the reproductive phase (V12) because a mechanism by which maize could maintain its production of this study was the accumulation of total soluble sugar content to decrease proline content under drought stress condition.","PeriodicalId":36369,"journal":{"name":"Journal of Current Science and Technology","volume":"66 15","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138594872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quality Characteristics of Healthy Bread Produced from Germinated Brown Rice, Germinated Mung Bean, and Germinated White Kidney Bean","authors":"Thanawee Loikaeo","doi":"10.59796/jcst.v14n1.2024.5","DOIUrl":"https://doi.org/10.59796/jcst.v14n1.2024.5","url":null,"abstract":"Germinated grains and pulses are known as sources of bioactive compounds that provide beneficial effects for human health. Moreover, germination improves their protein digestibility and biological properties. This research aimed to investigate the physicochemical properties of the composite flour made by blending germinated brown rice (GBR), germinated mung bean (GMB), and germinated white kidney bean (GWKB) at the ratio of 1:1:1. Additionally, the quality of bread made by substituting the composite flour for wheat flour at 25%, 30%, 35%, and 40% (w/w) was assessed. The results showed that the composite flour had significantly higher amounts of fat, protein, crude fiber, ash, GABA, and total phenolic content than wheat flour. The antioxidant capacity, calculated as vitamin C equivalent antioxidant capacity (VCEAC), of the composite flour was 42.86 mg/100 g, which was twice that of wheat flour. The pasting properties of the GBR, GMB, and GWKB flours, including the composite flour were considerably different from those of wheat flour. Based on this study, the optimized level of the composite flour substitution was 25 g per100 g of wheat flour. The wheat composite flour bread showed higher levels of beneficial components, such as protein, minerals, gamma-aminobutyric acid (GABA) and polyphenols, and antioxidant capacity, than the control bread. Bread made with a 25% substitution of composite flour had a more yellow hue than the control wheat bread, but there was no discernible difference in the loaf's specific volume, density, and firmness.","PeriodicalId":36369,"journal":{"name":"Journal of Current Science and Technology","volume":"59 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138597315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phytochemical Assessment, Antioxidant Activity, and in vitro Wound Healing Potential of Polygonum minus Huds","authors":"Muhammad Amirul Adli, Lini Idris, Shahida Muhamad Mukhtar, Monporn Payaban, Richard Johari James, Hasseri Halim, Annie George, Rozaini MOHD ZOHDI","doi":"10.59796/jcst.v14n1.2024.18","DOIUrl":"https://doi.org/10.59796/jcst.v14n1.2024.18","url":null,"abstract":"The increasing prevalence of chronic wounds, associated with aging, obesity, and diabetes, is compounded by bacterial resistance and adverse effects associated with commercial wound care products. Therefore, treatment modalities to accelerate the healing process are constantly being sought. This study aimed to investigate the phytochemical composition, antioxidant, and wound healing potential of the aqueous extract derived from the stems and leaves of Polygonum minus. The extract was subjected to phytochemical evaluation to assess the diversity of secondary metabolites. The total phenolic content (TPC) and total flavonoid content (TFC) were measured using the Folin-Ciocalteu colorimetric and aluminium chloride methods, respectively. The antioxidant activity was determined using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging and ferric-reducing antioxidant power (FRAP) assays. The wound healing effects were evaluated using proliferation and migration assays on human epidermal keratinocyte (HaCaT) cells. The phytochemical evaluation of the aqueous extract revealed the presence of flavonoids, terpenoids, alkaloids, saponins, tannins, steroids, and cardiac glycosides. Furthermore, the extract exhibited high TPC (137.74 ± 0.75 µg/mL GAE) and TFC (177.08 ± 3.16 µg/mL QE) values, as well as radical scavenging activity at 79.50% in the DPPH assay and a FRAP value of 1485.67 ± 0.05 µM/g Fe2+. At the lowest concentration of 7.81 μg/mL, the extract significantly stimulated cell proliferation and migration within 24 hours of treatment. The stimulation of cell migration was comparable with that of allantoin, which was used as a positive control. This study indicated that the P. minus aqueous extract contains a high concentration of phenolic compounds, which could contribute significantly to its antioxidant activity and promote the proliferation and migration of keratinocytes. The findings suggest that the extract may merit further investigation for potential applications in topical therapy related to wound healing.","PeriodicalId":36369,"journal":{"name":"Journal of Current Science and Technology","volume":"50 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138596668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}