Orbital: The Electronic Journal of Chemistry最新文献

Unexpected Dimerizations of Arylfurfural Oximes in their Mass Spectra 芳基糠醛肟质谱中的意外二聚化现象

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Orbital: The Electronic Journal of Chemistry Pub Date : 2024-01-06 DOI: 10.17807/orbital.v15i4.18631

S. Aslam, Aroog Fatima, Sidra Mustafa, Ansa Madeeha Zafar, Noreen Aslam, M. Jabeen, M. Munawar, M. Khan

引用次数: 0

STEM and STEAM Affects Computational Thinking Skill: A Systematic Literature Review STEM 和 STEAM 对计算思维能力的影响：系统性文献综述

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Orbital: The Electronic Journal of Chemistry Pub Date : 2024-01-05 DOI: 10.17807/orbital.v15i4.18323

Suci Sukmawati Syafe'i, Hayuni Retno Widarti, I Wayan Dasna, Habiddin, Parlan, Surjani Wonorahardjo

{"title":"STEM and STEAM Affects Computational Thinking Skill: A Systematic Literature Review","authors":"Suci Sukmawati Syafe'i, Hayuni Retno Widarti, I Wayan Dasna, Habiddin, Parlan, Surjani Wonorahardjo","doi":"10.17807/orbital.v15i4.18323","DOIUrl":"https://doi.org/10.17807/orbital.v15i4.18323","url":null,"abstract":"STEM (Science, Technology, Engineering, and Mathematics) dan STEAM (Science, Technology, Engineering, Arts, and Mathematics) melawan CT (Computational Thinking) berperan penting dalam pembelajaran sains. Penelitian ini bertujuan untuk melihat penelitian terbarukan terkait pengaruh STEM dan STEAM terhadap kemampuan CT. Kajian dilakukan berdasarkan 3 tahapan metode Systematic Literature Review (SLR): identifikasi, prosedur penyaringan (pre-processing, abstract screening, dan text filtering), dan pemetaan data. Hasil kajian literatur diperoleh dari 12 artikel dengan distribusi terbanyak pada tahun 2020 (n=5), terindeks Scopus Q1 (n=9), menerapkan metode penelitian mixed methods (n=6), dan diterapkan pada jenjang pendidikan dasar (n =6). Kemudian, instrumen yang paling banyak digunakan adalah tes Computational thinking (n=6) pada dimensi-dimensi penting penilaian CT berupa problem solving, abstraction, algorithmic thinking, critical thinking, creative dan cooperative; terintegrasi dalam kegiatan berbasis proyek dengan model desain game (n=2), menghasilkan proyek terbanyak dalam bentuk robot (n=4), dan keseluruhan kegiatan pembelajaran STEM dan STEAM berdampak positif pada CT. Berdasarkan temuan tersebut, dapat disimpulkan bahwa kegiatan STEAM mampu memberikan efek yang lebih besar dibandingkan STEM karena adanya “Art”. dan keseluruhan kegiatan pembelajaran STEM dan STEAM berdampak positif pada CT. Berdasarkan temuan tersebut, dapat disimpulkan bahwa kegiatan STEAM mampu memberikan efek yang lebih besar dibandingkan STEM karena adanya “Art”. dan keseluruhan kegiatan pembelajaran STEM dan STEAM berdampak positif pada CT. Berdasarkan temuan tersebut, dapat disimpulkan bahwa kegiatan STEAM mampu memberikan efek yang lebih besar dibandingkan STEM karena adanya “Art”.","PeriodicalId":19680,"journal":{"name":"Orbital: The Electronic Journal of Chemistry","volume":"8 3","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139381377","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}

引用次数: 0

Five-Tier Instrument to Identify Students' Misconceptions and Representation: A Systematic Literature Review 识别学生误解和表象的五层工具：系统性文献综述

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Orbital: The Electronic Journal of Chemistry Pub Date : 2024-01-03 DOI: 10.17807/orbital.v15i4.17709

Deni Ainur Rokhim, H. Widarti, Sutrisno Sutrisno

{"title":"Five-Tier Instrument to Identify Students' Misconceptions and Representation: A Systematic Literature Review","authors":"Deni Ainur Rokhim, H. Widarti, Sutrisno Sutrisno","doi":"10.17807/orbital.v15i4.17709","DOIUrl":"https://doi.org/10.17807/orbital.v15i4.17709","url":null,"abstract":"Initial knowledge and conception are one of the factors that have a major influence on learning activities. This is the basis for building students' knowledge of a material concept. However, not all students have the same ability, there are students who have low ability to build concepts. As a result, students who have low ability to build concepts may experience misconceptions that have an impact on their learning outcomes. Therefore, it is necessary to have an appropriate test instrument to identify misconceptions and multiple representation profiles especially in chemistry learning materials, one of which is the topic of reaction rate. This article aims to provide an overview of the application of the five-tier diagnostic instrument in identifying misconceptions and profiles of students' misconceptions about reaction rates. The method used is the SLR (Systematic Literature Review) from literature studies from 2011 to 2021 which are available in the ERIC, SINTA, and Google Scholar databases. The findings of the research results show that the five-tier test instrument can identify students' misconceptions about learning material. Information obtained from the use of the instrument can be used to determine the development of students' ability to understand chemistry using representations.","PeriodicalId":19680,"journal":{"name":"Orbital: The Electronic Journal of Chemistry","volume":"82 9","pages":""},"PeriodicalIF":0.6,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139388115","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}

引用次数: 0

The Theoretical Description for Cenobamate CuS-Assisted Electrochemical Determination in Pharmaceutical Formulations and Wastewater 药物制剂和废水中氯钴胺 CuS 辅助电化学检测的理论描述

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Orbital: The Electronic Journal of Chemistry Pub Date : 2024-01-03 DOI: 10.17807/orbital.v15i4.19558

Volodymyr Tkach, Tetiana Morozova, V. Khrutba, Andrii Hlukhonets, Marta Kushnir, Y. Ivanushko, Viktor Kryvetskyi, Inna Kryvetska, I. Kryvetskyi, P. Yagodynets, M. Kucher, Z. Kormosh, Nadiia Chikun, Maria João Monteiro

引用次数: 0

Effect of Solid-state Fermentation Parameters on Growth of Interest and Environmental Enzyme Production with Aspergillus niger 固态发酵参数对黑曲霉生长和环境酶生产的影响

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Orbital: The Electronic Journal of Chemistry Pub Date : 2023-10-13 DOI: 10.17807/orbital.v15i3.18211

Kayna Hidalgo Zambrano, Carlos Delgado Villafuerte, Ernesto Rosero Delgado

{"title":"Effect of Solid-state Fermentation Parameters on Growth of Interest and Environmental Enzyme Production with Aspergillus niger","authors":"Kayna Hidalgo Zambrano, Carlos Delgado Villafuerte, Ernesto Rosero Delgado","doi":"10.17807/orbital.v15i3.18211","DOIUrl":"https://doi.org/10.17807/orbital.v15i3.18211","url":null,"abstract":"Using residual biomass in biological processes is increasingly promoted to alleviate environmental impacts. However, the focus is mainly based on emerging technologies and limited resources, and the conditions of the technologies remain unclear. The objective of this research is to establish the conditions of a solid-state fermentation system (SSF) for the growth of fungal biomass and the production of ligninolytic enzymes of environmental interest using Aspergillus niger. In a screening step, the biomass and lipase enzyme expression of three A. niger strains obtained from different screening sites will be extended. In the second stage, the effect of packing density (ρs) and airflow (vvm) was evaluated through a 23, on the growth of fungal biomass, fiber degradation, and CO2 generation in a lipid-contaminated SSF system. The generation of biomass and the concentration of specific enzymatic activity (U/L) of lipase present a correlation for all the strains evaluated. It was estimated that the A. niger strain AN19bc isolated from sugarcane bagasse presents the highest accumulation of biomass and concentration of specific enzyme activity of lipase (0.027 U/L) after nine days. The most appropriate conditions for the production of fungal biomass of the AN19bc strain in an SSF system are presented with an airflow of 33.33 vvm and packing density ρs = 360 kg Mss/m3, levels with which Yx/s= 0.91 is reached. After the process, the solid support used in the SSF presents a change in composition, with the fiber being the component that suffers a considerable degradation of 78.70%.","PeriodicalId":19680,"journal":{"name":"Orbital: The Electronic Journal of Chemistry","volume":"23 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139319539","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}

引用次数: 0

The Theoretical Description for Fructose Fermentation Product Hydroxyquinol and its Ether Sesamol Amperometric Determination in Tahini Halva and Lokum 果糖发酵产物羟基苯酚及其醚芝麻酚在塔希尼哈勒瓦和洛肯中的安培测定的理论描述

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Orbital: The Electronic Journal of Chemistry Pub Date : 2023-10-12 DOI: 10.17807/orbital.v15i3.18796

Volodymyr Tkach, Marta Kushnir, Iryna Korniienko, Yastremska Larysa, Olena Kuznetsova, Viktor Kryvetskyi, Inna Kryvetska, Igor Kryvetskyi, P. Yagodynets, Z. Kormosh, Dina Fedorova, Nadiia Chikun

引用次数: 0

A Comparative Study of Adsorption of Methylene Blue Dye onto Untreated Platanus orientalis (chinar tree) Leaves Powder and its Biochar - Equilibrium, Kinetic and Thermodynamic Study 未处理桔梗叶粉及其生物炭对亚甲蓝染料吸附的比较研究--平衡、动力学和热力学研究

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Orbital: The Electronic Journal of Chemistry Pub Date : 2023-10-11 DOI: 10.17807/orbital.v15i3.18358

Fairooz Ahmad Khan, Mushtaq Ahmad Bhat Mushtaq, Pathan Mohd Arif Arif, Mazahar Farooqui Mazahar

{"title":"A Comparative Study of Adsorption of Methylene Blue Dye onto Untreated Platanus orientalis (chinar tree) Leaves Powder and its Biochar - Equilibrium, Kinetic and Thermodynamic Study","authors":"Fairooz Ahmad Khan, Mushtaq Ahmad Bhat Mushtaq, Pathan Mohd Arif Arif, Mazahar Farooqui Mazahar","doi":"10.17807/orbital.v15i3.18358","DOIUrl":"https://doi.org/10.17807/orbital.v15i3.18358","url":null,"abstract":"In the present investigation the adsorption behavior of methylene blue (MB) dye from aqueous solution onto untreated chinar leaves powder (CLP) and chinar leaves biochar (CLB) has been studied. To find out optimum conditions, adsorption process was carried out by varying different parameters such as contact time, adsorbent dose, concentration, temperature, salts, and pH. The equilibrium adsorption data were subjected to different popular isotherms (Langmuir, Freundlich, and Temkin) and kinetic models (pseudo-first order, pseudo-second order and intra-particle diffusion model). The thermodynamic study was also done on the adsorption process. The maximum monolayer adsorption capacities for MB dye onto given adsorbents are 1.53 mg/g (CLP) and 1.02 mg/g (CLB). Also the values of RL and n suggest favourable adsorption process of MB dye onto CLP and CLB adsorbents. The pseudo-second order kinetic model is best obeyed by both the mentioned adsorbents for MB dye adsorption with R2 value equal to 1. Thermodynamic study reveals that the adsorption process of MB dye is spontaneous, endothermic (CLB) and exothermic (CLP). At an equilibrium time of 20 min the uptake efficiency (> 99%) was recorded for both the low cost adsorbents (CLP and CLB) thus proved them fast and effective adsorbents for the removal of MB dye.","PeriodicalId":19680,"journal":{"name":"Orbital: The Electronic Journal of Chemistry","volume":"71 1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139320559","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}

引用次数: 0

Combined Toxicity of Methylparaben and Propylparaben in Artemia salina and Allium cepa Applying Experimental Design 对羟基苯甲酸甲酯和对羟基苯甲酸丙酯在盐蒿和薤白中的联合毒性应用实验设计

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Orbital: The Electronic Journal of Chemistry Pub Date : 2023-10-11 DOI: 10.17807/orbital.v15i3.17993

Estela Moraes Nolasco, João Vitor dos Santos Da Silva, João Vitor Vieira De Paula, Fábio Luciano Caldas Da Silva, M. Leitão, Alessandra Silveira Antunes Araújo, Andreia de Oliveira Massulo, Amilcar Machulek Jr., Lucas De Melo da Silva

{"title":"Combined Toxicity of Methylparaben and Propylparaben in Artemia salina and Allium cepa Applying Experimental Design","authors":"Estela Moraes Nolasco, João Vitor dos Santos Da Silva, João Vitor Vieira De Paula, Fábio Luciano Caldas Da Silva, M. Leitão, Alessandra Silveira Antunes Araújo, Andreia de Oliveira Massulo, Amilcar Machulek Jr., Lucas De Melo da Silva","doi":"10.17807/orbital.v15i3.17993","DOIUrl":"https://doi.org/10.17807/orbital.v15i3.17993","url":null,"abstract":"Parabens are used as preservatives in sanitizers and cosmetic products causing environmental concern, because presented potential as endocrine disrupters. Among these compounds, the most used are methylparaben and propylparaben. Thus, a study was proposed to evaluate the interaction between different concentrations (mmol L-1) of the variables methylparaben [MP] and propylparaben [PP], against the acute toxicity of the microcrustacean Artemia salina (A. salina) and Allium cepa (A. cepa) applying the 22 factorial design with an added center point. Responses were used: percent A. salina mortality (% mortality), A. cepa root growth inhibition (% root inhibition) and mitotic index (%MI). For A. salina, after 72 hours of exposure with the combination of concentration ([MP] and [PP] = 0.8 mmol L−1) caused an 80% mortality. While, A. cepa a high cytotoxicity was observed with the mixture of Parabens, exhibiting 72.3% root growth inhibition at [MP] = 1.2 mmol L-1 with [PP] = 1.2 mmol L-1. In contrast, for response %MI at [MP] = 0.3 mmol L-1 with [PP] = 0.3 mmol L-1, 2.5 %MI with 36% inhibition. In this context, parabens demonstrated high toxicity for A. salina and cytotoxicity for A. cepa, based on the interaction with the effect of the concentrations.","PeriodicalId":19680,"journal":{"name":"Orbital: The Electronic Journal of Chemistry","volume":"138 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139320621","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}

引用次数: 0

The Green and Efficient One-pot Synthesis of Tetrahydrobenzo[b]pyran Derivatives 四氢苯并[b]吡喃衍生物的绿色高效一步法合成

IF 0.6

Orbital: The Electronic Journal of Chemistry Pub Date : 2023-10-11 DOI: 10.17807/orbital.v15i3.17906

B. Ankush, B. V. Shitole, N. V. Shitole

引用次数: 0

Synthesis and Application of Polypyrrole/DBSA/Boron Nitride Ternary Composite as a Potential Chemical Sensor for Ammonia Gas Detection 聚吡咯/DBSA/氮化硼三元复合材料的合成与应用--一种用于氨气检测的潜在化学传感器

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Orbital: The Electronic Journal of Chemistry Pub Date : 2023-10-08 DOI: 10.17807/orbital.v15i3.17875

Kavirajaa Pandian Sambasevam, Nur Farahin Suhaimi, Izyan Najwa Mohd Norsham, Syed Shahabuddin, M. Raoov, S. Baharin

{"title":"Synthesis and Application of Polypyrrole/DBSA/Boron Nitride Ternary Composite as a Potential Chemical Sensor for Ammonia Gas Detection","authors":"Kavirajaa Pandian Sambasevam, Nur Farahin Suhaimi, Izyan Najwa Mohd Norsham, Syed Shahabuddin, M. Raoov, S. Baharin","doi":"10.17807/orbital.v15i3.17875","DOIUrl":"https://doi.org/10.17807/orbital.v15i3.17875","url":null,"abstract":"The present study demonstrates the self-assembly method of chemical oxidative polymerization of polypyrrole (PPy), polypyrrole/boron nitride (PPy/BN), and polypyrrole/dodecylbenzene sulfonic acid/boron nitride (PPy/DBSA/BN) thin films for ammonia (NH3) gas detection. The PPy, PPy/BN, and PPy/DBSA/BN thin films were comprehensively characterized using Attenuated Total Reflectance Fourier-Transform Infrared Spectroscopy (ATR-FTIR), Scanning Electron Microscopy (SEM), X-ray diffractometry (XRD) and conductivity measurement. ATR-FTIR revealed all the pertinent peaks of PPy, BN, and DBSA present in the PPy/DBSA/BN. SEM images of PPy/DBSA/BN depict well-organized morphology. PPy/DBSA/BN recorded the highest conductivity of 4.771 x 10-6 S cm-1 among the prepared polymer thin films. The obtained characterization results are in good agreement with the NH3 gas sensor measurements conducted on the PPy/DBSA/BN composite. The linear correlation coefficient between the two was found to be R2 = 0.9916, indicating a strong relationship. Furthermore, the PPy/DBSA/BN thin film demonstrated a low limit of detection (LOD) of 5.8 ppm, surpassing the OSHA threshold value for NH3 gas. This suggests that the sensor is highly sensitive to trace amounts of NH3 gas. Moreover, the PPy/DBSA/BN thin film exhibited exceptional reusability, with the ability to be used for up to 10 cycles without a significant decrease in performance. The sensor also demonstrated selectivity towards NH3 gas in the presence of common interfering species. Additionally, it exhibited long-term stability, maintaining its performance over a period of 7 days. The proposed self-assembled gas sensor has showcased remarkable performance in detecting NH3 gas at room temperature, making it a promising candidate for industrial applications.","PeriodicalId":19680,"journal":{"name":"Orbital: The Electronic Journal of Chemistry","volume":"38 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139321825","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}

引用次数: 0