Pub Date : 2024-06-02DOI: 10.31851/sainmatika.v21i1.14864
Agus Irawan, Ana Istiani
The locating chromatic number is a graph invariant that quantifies the minimum number of colors required for proper vertex coloring, ensuring that any two vertices with the same color have distinct sets of neighbors. This study introduces a new operation on generalized Petersen graphs denoted by N_(P(m,1)), exploring its impact on locating chromatic numbers. Through systematic analysis, we aim to determine the specific conditions under which this operation influences the locating chromatic number and provide insights into the underlying graph-theoretical properties. The method for computing the locating chromatic number for the new operation on generalized Petersen graphs, denoted by N_(P(m,1)), entails determining the lower and upper limits. The results indicate that the locating chromatic number for the new operation on the generalized Petersen graph is 4 for m=4 and 5 for m≥5. The findings contribute to a broader understanding of graph coloring.
{"title":"The Locating Chromatic Number for the New Operation on Generalized Petersen Graphs N_P(m,1)","authors":"Agus Irawan, Ana Istiani","doi":"10.31851/sainmatika.v21i1.14864","DOIUrl":"https://doi.org/10.31851/sainmatika.v21i1.14864","url":null,"abstract":"The locating chromatic number is a graph invariant that quantifies the minimum number of colors required for proper vertex coloring, ensuring that any two vertices with the same color have distinct sets of neighbors. This study introduces a new operation on generalized Petersen graphs denoted by N_(P(m,1)), exploring its impact on locating chromatic numbers. Through systematic analysis, we aim to determine the specific conditions under which this operation influences the locating chromatic number and provide insights into the underlying graph-theoretical properties. The method for computing the locating chromatic number for the new operation on generalized Petersen graphs, denoted by N_(P(m,1)), entails determining the lower and upper limits. The results indicate that the locating chromatic number for the new operation on the generalized Petersen graph is 4 for m=4 and 5 for m≥5. The findings contribute to a broader understanding of graph coloring.","PeriodicalId":502832,"journal":{"name":"Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam","volume":"45 13","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141274110","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}
Pub Date : 2024-04-07DOI: 10.31851/sainmatika.v21i1.14810
Sunarto, K. Sobri, Alfitri, Abdul Nadjib
Land fires pose a serious threat to the environment and communities in Ogan Ilir Regency, South Sumatra. This study aims to analyze the distribution pattern of land fires using GIS spatial analysis technology. Through Sentinel-2 image classification and fire intensity analysis, it had been identified focal points of dormant land fires mainly in South Indralaya, North Indralaya, and West Pemulutan sub-districts. The results of this study provide in-depth insight into the spatial distribution of land fires and the factors that influence their occurrence. This research also produced a map of the distribution of fire hotspots in unused land areas. From the research, it can be concluded that spatial analysis can map in detail and comprehensively the burning locations on unused land. The implication of this research is the need to develop more effective mitigation strategies to address the risk of land fires in the future. Therefore, this study not only makes an important contribution to the scientific literature but also offers new directions for research and policy focused on sustainable and effective land fire risk management.
{"title":"Geographic Information System (GIS) Spatial Analysis to Detect the Distribution Pattern of Unused Land Fires at Ogan Ilir Regency","authors":"Sunarto, K. Sobri, Alfitri, Abdul Nadjib","doi":"10.31851/sainmatika.v21i1.14810","DOIUrl":"https://doi.org/10.31851/sainmatika.v21i1.14810","url":null,"abstract":"Land fires pose a serious threat to the environment and communities in Ogan Ilir Regency, South Sumatra. This study aims to analyze the distribution pattern of land fires using GIS spatial analysis technology. Through Sentinel-2 image classification and fire intensity analysis, it had been identified focal points of dormant land fires mainly in South Indralaya, North Indralaya, and West Pemulutan sub-districts. The results of this study provide in-depth insight into the spatial distribution of land fires and the factors that influence their occurrence. This research also produced a map of the distribution of fire hotspots in unused land areas. From the research, it can be concluded that spatial analysis can map in detail and comprehensively the burning locations on unused land. The implication of this research is the need to develop more effective mitigation strategies to address the risk of land fires in the future. Therefore, this study not only makes an important contribution to the scientific literature but also offers new directions for research and policy focused on sustainable and effective land fire risk management.","PeriodicalId":502832,"journal":{"name":"Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140733587","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}
Iron (Fe) is one of the elements that can be found in almost every place on earth, in all geological levels, and in all water bodies. In general, the iron in the water can be dissolved. The content of Fe ions in drilled well water can range between 5-7 mg/L. ICP-OES spectrophotometry is a type of ICP that utilizes plasma as a source of atomization and excitation. The purpose of this research is to determine the difference in Fe content between well water samples and PDAM water samples in the Pemulutan sub-district using the ICP-OES spectrophotometer. The type of research used was cross-sectional. The population in this study was well-watered and PDAM-watered in Pemulutan District. The sampling technique in this study was simply random. The place of this research was in the Palembang Health Laboratory Center. The results showed that the average difference in the examination of Fe levels in well water samples and PDAM water using the sda was 0.13198 mg/L for well water and 0.00445 mg/L for PDAM water. The conclusions were that PDAM water is safer to use for sanitation activities or consumption purposes than well water. The iron (Fe) content in well water is higher than the iron (Fe) content in PDAM water.
{"title":"Comparison to the Iron Level on the well water and PDAM water sample using ICP-OES Spectrophotometer","authors":"Alya Melanisya Fadhilah, Nurhidayanti, Denny Juraijin","doi":"10.31851/sainmatika.v20i2.12991","DOIUrl":"https://doi.org/10.31851/sainmatika.v20i2.12991","url":null,"abstract":"Iron (Fe) is one of the elements that can be found in almost every place on earth, in all geological levels, and in all water bodies. In general, the iron in the water can be dissolved. The content of Fe ions in drilled well water can range between 5-7 mg/L. ICP-OES spectrophotometry is a type of ICP that utilizes plasma as a source of atomization and excitation. The purpose of this research is to determine the difference in Fe content between well water samples and PDAM water samples in the Pemulutan sub-district using the ICP-OES spectrophotometer. The type of research used was cross-sectional. The population in this study was well-watered and PDAM-watered in Pemulutan District. The sampling technique in this study was simply random. The place of this research was in the Palembang Health Laboratory Center. The results showed that the average difference in the examination of Fe levels in well water samples and PDAM water using the sda was 0.13198 mg/L for well water and 0.00445 mg/L for PDAM water. The conclusions were that PDAM water is safer to use for sanitation activities or consumption purposes than well water. The iron (Fe) content in well water is higher than the iron (Fe) content in PDAM water.","PeriodicalId":502832,"journal":{"name":"Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam","volume":"2 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139187563","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}
Pub Date : 2023-12-02DOI: 10.31851/sainmatika.v20i2.12736
Dwien E. Pattipeilohy, S. Liline, S. Salmanu, Tri Santi Kurnia
Patellidae are gastropods that live in intertidal zones and sublittoral zones of shallow rocky shores because Patellidae are usually attached to boulders. Patellidae belongs to the order Archaeogastropoda and generally only has two genera, namely Cellana and Patella. Patellidae are also found in the waters of Ambon Island, namely in the Hukurila Village and Allang Village. This study aims to determine the type, morphometrics, density, and proximate levels of Patellidae in the waters of Ambon Island. Samples were taken using purposive sampling with cruising methods. The Patellidae are attached to the substrate. Samples from two locations were taken and put into plastic, and then the type and morphometrics were identified at the Basic Biology Laboratory of the Faculty of Teacher Training and Education, Pattimura University. Proximate levels were conducted at the Basic Chemistry Laboratory, Faculty of Mathematics and Natural Sciences, Pattimura University. This research was conducted from October 15, 2022, to November 15, 2022. Based on the results, two species of the Patellidae family were found in Ambon Island, namely C. testudinaria and P. flexuosa. The results of the calculation of morphometric Patellidae in the Waters of Ambon Island showed that the species C. testudinaria in the Waters of Hukurila Village has a larger morphometric characteristic size compared to the species C. testudinaria and P. flexuosa in the Waters of Allang Village. More individuals of P. flexuosa species were found in Alang village than C. testudinaria species, while many C. testudinaria species were found in Hukurila village. Based on the proximate analysis results, Patellidae from the waters of Ambon Island have nutritious and good nutritional content to be used as food ingredients.
{"title":"Exploration of Patellidae from Coastal Waters of Ambon Island, Indonesia","authors":"Dwien E. Pattipeilohy, S. Liline, S. Salmanu, Tri Santi Kurnia","doi":"10.31851/sainmatika.v20i2.12736","DOIUrl":"https://doi.org/10.31851/sainmatika.v20i2.12736","url":null,"abstract":"Patellidae are gastropods that live in intertidal zones and sublittoral zones of shallow rocky shores because Patellidae are usually attached to boulders. Patellidae belongs to the order Archaeogastropoda and generally only has two genera, namely Cellana and Patella. Patellidae are also found in the waters of Ambon Island, namely in the Hukurila Village and Allang Village. This study aims to determine the type, morphometrics, density, and proximate levels of Patellidae in the waters of Ambon Island. Samples were taken using purposive sampling with cruising methods. The Patellidae are attached to the substrate. Samples from two locations were taken and put into plastic, and then the type and morphometrics were identified at the Basic Biology Laboratory of the Faculty of Teacher Training and Education, Pattimura University. Proximate levels were conducted at the Basic Chemistry Laboratory, Faculty of Mathematics and Natural Sciences, Pattimura University. This research was conducted from October 15, 2022, to November 15, 2022. Based on the results, two species of the Patellidae family were found in Ambon Island, namely C. testudinaria and P. flexuosa. The results of the calculation of morphometric Patellidae in the Waters of Ambon Island showed that the species C. testudinaria in the Waters of Hukurila Village has a larger morphometric characteristic size compared to the species C. testudinaria and P. flexuosa in the Waters of Allang Village. More individuals of P. flexuosa species were found in Alang village than C. testudinaria species, while many C. testudinaria species were found in Hukurila village. Based on the proximate analysis results, Patellidae from the waters of Ambon Island have nutritious and good nutritional content to be used as food ingredients.","PeriodicalId":502832,"journal":{"name":"Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139187564","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}
Pub Date : 2023-11-29DOI: 10.31851/sainmatika.v20i2.11898
Fadhli Aslama Afghani, Imawan Mashuri, Ramadoni Khirtin, Muhammad Adi Cahyo
Topography and rainfall correlate with each other. Therefore, this study aims to determine the effect of topography on rainfall characteristicss in the Cilacap and Bandung areas. The research method used is a descriptive statistical analysis of average monthly, seasonal, and annual rainfall. In addition, time series and regression tests were carried out using the SPSS application. The data used is the daily rainfall data period of 2016–2020. The results of the descriptive analysis show that the variability of monthly rainfall in Bandung is higher than in Cilacap, with a value range that is 113.6–643.82 mm/month for Bandung and 92.1-355.56 mm/month for Cilacap. Global climate dynamics for instance apparent sun motion, Monsoon, ITCZ, ENSO, and IOD, as well as local weather systems like valley winds, also affect seasonal and annual rainfall variability in Bandung and Cilacap. The rainfall time series test produces values that are not stationary concerning the variance but stationary concerning the average. A simple linear regression test shows the effect of a topography of 55.2% on rainfall. The purpose of simple linear regression is to understand and model the relationship between two variables: the independent variable (topography) and the dependent variable (rainfall characteristics).
{"title":"Topography Effects on Rainfall Characteristics in Bandung City and Cilacap Regency for the 2016-2020 Period","authors":"Fadhli Aslama Afghani, Imawan Mashuri, Ramadoni Khirtin, Muhammad Adi Cahyo","doi":"10.31851/sainmatika.v20i2.11898","DOIUrl":"https://doi.org/10.31851/sainmatika.v20i2.11898","url":null,"abstract":"Topography and rainfall correlate with each other. Therefore, this study aims to determine the effect of topography on rainfall characteristicss in the Cilacap and Bandung areas. The research method used is a descriptive statistical analysis of average monthly, seasonal, and annual rainfall. In addition, time series and regression tests were carried out using the SPSS application. The data used is the daily rainfall data period of 2016–2020. The results of the descriptive analysis show that the variability of monthly rainfall in Bandung is higher than in Cilacap, with a value range that is 113.6–643.82 mm/month for Bandung and 92.1-355.56 mm/month for Cilacap. Global climate dynamics for instance apparent sun motion, Monsoon, ITCZ, ENSO, and IOD, as well as local weather systems like valley winds, also affect seasonal and annual rainfall variability in Bandung and Cilacap. The rainfall time series test produces values that are not stationary concerning the variance but stationary concerning the average. A simple linear regression test shows the effect of a topography of 55.2% on rainfall. The purpose of simple linear regression is to understand and model the relationship between two variables: the independent variable (topography) and the dependent variable (rainfall characteristics).","PeriodicalId":502832,"journal":{"name":"Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam","volume":"63 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139212749","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}
Pub Date : 2023-11-29DOI: 10.31851/sainmatika.v20i2.13128
Mustika Sari Hutabarat, Hotman Sinaga
Cell phones have become a very important communication tool in everyday life. Considering that many people are in the habit of using their mobile phones while doing other activities, most people even have the habit of taking their phones to the toilet. Cell phones become inanimate objects that play an important role in the transmission of microorganisms. Therefore, we need to maintain hand hygiene by keeping our hands clean after handling the mobile phone before performing activities and disinfecting the mobile phone regularly, considering that this object cannot be washed while the mobile phone is a potential vector for infectious diseases. Mobile phones can effectively eliminate hand hygiene due to their compulsive use despite hand washing. The purpose of this study was to determine the role of 70% alcohol cotton on the surface of mobile phones to reduce the potential spread of bacteria. Based on the results of the research conducted, there is a difference in the number of bacterial colonies on mobile phones before and after disinfection with 70% alcohol cotton, as evidenced by the obtained p-value of 0.0001 (p <0.05).
{"title":"Identification and Counting of Bacterial Colonies on Mobile Phones Before and After 70% Alcohol Disinfection","authors":"Mustika Sari Hutabarat, Hotman Sinaga","doi":"10.31851/sainmatika.v20i2.13128","DOIUrl":"https://doi.org/10.31851/sainmatika.v20i2.13128","url":null,"abstract":"Cell phones have become a very important communication tool in everyday life. Considering that many people are in the habit of using their mobile phones while doing other activities, most people even have the habit of taking their phones to the toilet. Cell phones become inanimate objects that play an important role in the transmission of microorganisms. Therefore, we need to maintain hand hygiene by keeping our hands clean after handling the mobile phone before performing activities and disinfecting the mobile phone regularly, considering that this object cannot be washed while the mobile phone is a potential vector for infectious diseases. Mobile phones can effectively eliminate hand hygiene due to their compulsive use despite hand washing. The purpose of this study was to determine the role of 70% alcohol cotton on the surface of mobile phones to reduce the potential spread of bacteria. Based on the results of the research conducted, there is a difference in the number of bacterial colonies on mobile phones before and after disinfection with 70% alcohol cotton, as evidenced by the obtained p-value of 0.0001 (p <0.05).","PeriodicalId":502832,"journal":{"name":"Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139210079","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}
Pub Date : 2023-11-27DOI: 10.31851/sainmatika.v20i2.12651
M. I. Mauliana, Yulian Findawati, G. R. Hanum
Increasing the effectiveness of cloth masks can reduce the use of disposable medical masks which creates a new waste problem. In this research, the synthesis of zinc oxide nanoparticles was carried out using the precipitation method through the reaction between zinc nitrate and phosphoric acid as one of the ingredients in the chitosan-ZnO/C composite mixture. The carbon source is obtained from activated coconut shell carbon using sodium hydroxide. X-ray diffractometer (XRD) testing was carried out to determine the phase content of the synthesized carbon powder. XRD testing was also carried out on synthesized ZnO particles to determine the occurrence of phase transformations and to determine the quantitative and qualitative characteristics of the material. Fourier Transform Infrared testing was also carried out to observe functional group bonds formed in carbon compounds. Composite materials that have been successfully made will then be tested for hydrophobicity by calculating the contact angle. The results of this study indicate that the synthetic base material has been successfully carried out and the composite has been successfully made. The highest water contact angle is 106o was found in the chitosan/ZnO composite sample with a ratio of 2:1 and a mass variation of 0.05 gr active carbon.
提高布口罩的功效可以减少一次性医用口罩的使用，而一次性医用口罩又会产生新的废物问题。本研究采用沉淀法，通过硝酸锌和磷酸的反应合成了纳米氧化锌，作为壳聚糖-ZnO/C 复合混合物的成分之一。碳源来自使用氢氧化钠的活性椰壳碳。通过 X 射线衍射仪（XRD）测试来确定合成碳粉的相含量。还对合成的氧化锌颗粒进行了 XRD 测试，以确定相变的发生，并确定材料的定量和定性特征。此外，还进行了傅立叶变换红外线测试，以观察碳化合物中形成的官能团键。成功制成的复合材料将通过计算接触角进行疏水性测试。这项研究的结果表明，合成基础材料的工作已经顺利完成，复合材料也已成功制成。壳聚糖/氧化锌复合材料样品的比例为 2:1，活性碳的质量变化为 0.05 克，其水接触角最大，为 106o。
{"title":"The Effect of Carbon on Chitosan-ZnO Composites as Fabric Mask Coating Materials","authors":"M. I. Mauliana, Yulian Findawati, G. R. Hanum","doi":"10.31851/sainmatika.v20i2.12651","DOIUrl":"https://doi.org/10.31851/sainmatika.v20i2.12651","url":null,"abstract":"Increasing the effectiveness of cloth masks can reduce the use of disposable medical masks which creates a new waste problem. In this research, the synthesis of zinc oxide nanoparticles was carried out using the precipitation method through the reaction between zinc nitrate and phosphoric acid as one of the ingredients in the chitosan-ZnO/C composite mixture. The carbon source is obtained from activated coconut shell carbon using sodium hydroxide. X-ray diffractometer (XRD) testing was carried out to determine the phase content of the synthesized carbon powder. XRD testing was also carried out on synthesized ZnO particles to determine the occurrence of phase transformations and to determine the quantitative and qualitative characteristics of the material. Fourier Transform Infrared testing was also carried out to observe functional group bonds formed in carbon compounds. Composite materials that have been successfully made will then be tested for hydrophobicity by calculating the contact angle. The results of this study indicate that the synthetic base material has been successfully carried out and the composite has been successfully made. The highest water contact angle is 106o was found in the chitosan/ZnO composite sample with a ratio of 2:1 and a mass variation of 0.05 gr active carbon.","PeriodicalId":502832,"journal":{"name":"Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139228418","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}
Pub Date : 2023-11-25DOI: 10.31851/sainmatika.v20i2.13010
Pra Dian Mariadi, Agnes Felicia Lubis, Lidwina Septie Ch
Lead as a component of air pollution has broad toxic effects and can be detrimental to humans, such as causing abnormalities in kidney function, digestive tract, nervous system, and hematopoietic disorders. Many people carry out their activities on the highway, one of which is an Angkot driver. Drivers who work on the road daily get direct exposure to air pollution, especially from lead (Pb). Therefore they are very vulnerable to the negative effects of lead (Pb). This study aimed to measure blood lead levels as a biomarker of lead contamination in a driving group in Palembang City. The subjects were drivers who had been working for more than 20 years (average 28 years) and the average age was 58 years. Testing blood lead levels using the APHA method and examining erythrocytes leukocytes and platelets using the impedance method and correlation test using the Spearman test. Based on the results of this study, there is a relationship between blood lead levels and erythrocyte (significance: 0.0019) and leukocyte (significance: 0.002) values, but there is no relationship between blood lead levels and platelet values (significance: 0.4), while blood lead levels in drivers are still within the threshold limit (average: 14.9804 µg/L).
{"title":"Lead Contamination in Driver's Blood and Its Effects on Erythrocytes, Leukocytes, and Platelets as A Biomarker","authors":"Pra Dian Mariadi, Agnes Felicia Lubis, Lidwina Septie Ch","doi":"10.31851/sainmatika.v20i2.13010","DOIUrl":"https://doi.org/10.31851/sainmatika.v20i2.13010","url":null,"abstract":"Lead as a component of air pollution has broad toxic effects and can be detrimental to humans, such as causing abnormalities in kidney function, digestive tract, nervous system, and hematopoietic disorders. Many people carry out their activities on the highway, one of which is an Angkot driver. Drivers who work on the road daily get direct exposure to air pollution, especially from lead (Pb). Therefore they are very vulnerable to the negative effects of lead (Pb). This study aimed to measure blood lead levels as a biomarker of lead contamination in a driving group in Palembang City. The subjects were drivers who had been working for more than 20 years (average 28 years) and the average age was 58 years. Testing blood lead levels using the APHA method and examining erythrocytes leukocytes and platelets using the impedance method and correlation test using the Spearman test. Based on the results of this study, there is a relationship between blood lead levels and erythrocyte (significance: 0.0019) and leukocyte (significance: 0.002) values, but there is no relationship between blood lead levels and platelet values (significance: 0.4), while blood lead levels in drivers are still within the threshold limit (average: 14.9804 µg/L).","PeriodicalId":502832,"journal":{"name":"Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam","volume":"353 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139238237","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}
Pub Date : 2023-11-25DOI: 10.31851/sainmatika.v20i2.13085
N. M. Surbakti, Dinda Kartika, Hamidah Nasution, Sri Dewi
The location chromatic number for a graph is an extension of the concepts of partition dimension and vertex coloring in a graph. The minimum number of colors required to perform location coloring in graph G is referred to as the location chromatic number of graph G. This research is a literature study that discusses the location chromatic number of the Pizza graph. The approach used to calculate the location-chromatic number of these graphs involves determining upper and lower bounds. The results obtained show that the location chromatic number of the pizza graph is 4 for n = 3 and n for ≥ 4.
图的位置色度数是图中分割维度和顶点着色概念的扩展。在图 G 中进行位置着色所需的最少颜色数称为图 G 的位置色度数。本研究是一项文献研究，讨论必胜图的位置色度数。计算这些图的位置色度数的方法包括确定上界和下界。得到的结果表明，当 n = 3 时，比萨图的位置色度数为 4，当 n≥ 4 时，比萨图的位置色度数为 n。
{"title":"The Locating Chromatic Number for Pizza Graphs","authors":"N. M. Surbakti, Dinda Kartika, Hamidah Nasution, Sri Dewi","doi":"10.31851/sainmatika.v20i2.13085","DOIUrl":"https://doi.org/10.31851/sainmatika.v20i2.13085","url":null,"abstract":"The location chromatic number for a graph is an extension of the concepts of partition dimension and vertex coloring in a graph. The minimum number of colors required to perform location coloring in graph G is referred to as the location chromatic number of graph G. This research is a literature study that discusses the location chromatic number of the Pizza graph. The approach used to calculate the location-chromatic number of these graphs involves determining upper and lower bounds. The results obtained show that the location chromatic number of the pizza graph is 4 for n = 3 and n for ≥ 4.","PeriodicalId":502832,"journal":{"name":"Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam","volume":"10 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139238194","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}
Pub Date : 2023-11-13DOI: 10.31851/sainmatika.v20i2.13270
Rian Oktiansyah, Yustina Hapida, Sinta Risasti
Pineapple (Ananas comosus (L.) Merr. 'Prabumulih') is a tropical fruit that is very popular for its unique aroma and sweet taste. It is also commonly believed that this fruit has potential applications in traditional medicine. However, the peel is not fully harnessed, despite its rich and intricate composition. This study presented findings regarding the endophytic fungi discovered within the peel of A comosus (L.) Merr. 'Prabumulih' and their performance as antioxidants. The endophytic fungal species were identified based on their morphological characteristics. The antioxidant assessment was carried out using the DPPH method. According to the findings of morphological identification, Trichoderma harzianum, an endophytic fungus, was found to exhibit the highest potential as an antioxidant source. Antioxidant activity showed a very strong category (IC50 = 18.74 µg/mL). Through the isolation of its pure constituents and subsequent in vivo testing, there is the potential for this extract from the endophytic fungus to evolve into an innovative source of antioxidants.
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