{"title":"Artefactos de piedra pulida de La Blanca","authors":"","doi":"10.2307/j.ctv1zcm1k3.9","DOIUrl":"https://doi.org/10.2307/j.ctv1zcm1k3.9","url":null,"abstract":"","PeriodicalId":298864,"journal":{"name":"La industria lítica del núcleo urbano maya de La Blanca, Petén, Guatemala","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124018980","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":"Agradecimientos","authors":"","doi":"10.2307/j.ctv1zcm1k3.5","DOIUrl":"https://doi.org/10.2307/j.ctv1zcm1k3.5","url":null,"abstract":"","PeriodicalId":298864,"journal":{"name":"La industria lítica del núcleo urbano maya de La Blanca, Petén, Guatemala","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127322127","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":"Artefactos de piedra tallada de La Blanca","authors":"","doi":"10.2307/j.ctv1zcm1k3.8","DOIUrl":"https://doi.org/10.2307/j.ctv1zcm1k3.8","url":null,"abstract":"","PeriodicalId":298864,"journal":{"name":"La industria lítica del núcleo urbano maya de La Blanca, Petén, Guatemala","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127867284","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":"El núcleo urbano maya de La Blanca y sus industrias","authors":"","doi":"10.2307/j.ctv1zcm1k3.7","DOIUrl":"https://doi.org/10.2307/j.ctv1zcm1k3.7","url":null,"abstract":"","PeriodicalId":298864,"journal":{"name":"La industria lítica del núcleo urbano maya de La Blanca, Petén, Guatemala","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116674710","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":"Prólogo","authors":"E. C. Rezzio","doi":"10.2307/j.ctv1zcm1k3.6","DOIUrl":"https://doi.org/10.2307/j.ctv1zcm1k3.6","url":null,"abstract":"","PeriodicalId":298864,"journal":{"name":"La industria lítica del núcleo urbano maya de La Blanca, Petén, Guatemala","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123195102","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}
I n the last decade the study of active oxygen and nitrogen species and their role in a large number of chronicle diseases, including cancer, heart disease and even aging itself, revealed that natural and synthetic antioxidants are able to prevent the effects caused by oxidative stress. Several methods can be used to evaluate the total antioxidant activity in body fluids, complex mixtures and isolated substances. Simple trapping assays can quantify the total antioxidant content in a sample, which is expressed as TRAP (total radical-trapping potentíal) or TEAC (trolox equivalent antioxidant capacity) and these indexes are well accepted due to its high sensitivity and operational facilities. The determination of the antioxidant potential of plant extracts and isolated natural products may constitute a simple tool to evaluate the potential biological activity of plant constituents. The chemiluminescence reaction of luminol and hydrogen peroxide in the presence of hemin as catalyst has been used as the method to evaluate the antioxidant activity, since the chemiluminescence emission can be suppressed by antioxidants, and a linear relationship between antioxidant concentration and the observed induction time is obtained. A kinetic study was performed to establish the ideal experimental conditions for the assay. The reactant concentrations were varied in the absence and the presence of antioxidants, and the results lead to a better understanding of the system. A new method for data treatment is al80 used, which allows the correlation of the antioxidant effect to the number of photons suppressed. Several well-known antioxidants (trolox, ascorbic and uric acid) were used to establish the methodology. TRAP values were calculated from the correlations between the number ofphotons suppressed and the antioxidant concentration, using trolox as reference compound. Using this methodology we were able to determine the antioxidant activity of Photomorphe umbellata extracts, and of its isolated major compound, 4-nerolidylcatechol. C(frações de 17 a23 e (O)) fração cromatográfica D(frações de 24 a 30). São apresentadas as intensidades dos picos, obtidos por detecção espectroscópica de UV-Visivel em 254 nm (em cima) e índice de refração (em baixo). Os tempos de retenção podem mostrar pequenas variações.
在过去十年中，对活性氧和活性氮物种及其在大量慢性疾病(包括癌症、心脏病甚至衰老本身)中的作用的研究表明，天然和合成抗氧化剂能够预防氧化应激引起的影响。有几种方法可用于评价体液、复杂混合物和分离物质中的总抗氧化活性。简单的捕获法可以量化样品中的总抗氧化剂含量，表示为TRAP(总自由基捕获potentíal)或TEAC (trolox等效抗氧化能力)，这些指标因其高灵敏度和操作方便而被广泛接受。测定植物提取物和分离的天然产物的抗氧化能力可能是评价植物成分潜在生物活性的一种简单工具。采用在hemin的催化下，鲁米诺与过氧化氢的化学发光反应作为评价抗氧化活性的方法，因为抗氧化剂可以抑制化学发光发射，并且抗氧化剂浓度与观察到的诱导时间呈线性关系。通过动力学研究建立了理想的实验条件。在无抗氧化剂和有抗氧化剂的情况下，反应物浓度发生了变化，结果有助于更好地了解该体系。采用了一种新的数据处理方法，使抗氧化效应与被抑制的光子数相关联。几种著名的抗氧化剂(trolox，抗坏血酸和尿酸)被用来建立方法。利用trolox作为参比化合物，根据抑制光子数与抗氧化剂浓度之间的相关性计算TRAP值。利用这种方法，我们能够测定光形伞提取物及其分离的主要化合物4-神经烯基儿茶酚的抗氧化活性。C(frações de 17 a23 e (O)); D(frações de 24 a30);s0代表了红外光谱、红外光谱、红外光谱探测 o espectroscópica de UV-Visivel em 254 nm (em cima)和índice de refra o (em baixo)。o tempos de retention o podem mosterpequenas variações。
{"title":"Índice de figuras","authors":"Alexandra Pardo Policastro","doi":"10.2307/j.ctv1zcm1k3.3","DOIUrl":"https://doi.org/10.2307/j.ctv1zcm1k3.3","url":null,"abstract":"I n the last decade the study of active oxygen and nitrogen species and their role in a large number of chronicle diseases, including cancer, heart disease and even aging itself, revealed that natural and synthetic antioxidants are able to prevent the effects caused by oxidative stress. Several methods can be used to evaluate the total antioxidant activity in body fluids, complex mixtures and isolated substances. Simple trapping assays can quantify the total antioxidant content in a sample, which is expressed as TRAP (total radical-trapping potentíal) or TEAC (trolox equivalent antioxidant capacity) and these indexes are well accepted due to its high sensitivity and operational facilities. The determination of the antioxidant potential of plant extracts and isolated natural products may constitute a simple tool to evaluate the potential biological activity of plant constituents. The chemiluminescence reaction of luminol and hydrogen peroxide in the presence of hemin as catalyst has been used as the method to evaluate the antioxidant activity, since the chemiluminescence emission can be suppressed by antioxidants, and a linear relationship between antioxidant concentration and the observed induction time is obtained. A kinetic study was performed to establish the ideal experimental conditions for the assay. The reactant concentrations were varied in the absence and the presence of antioxidants, and the results lead to a better understanding of the system. A new method for data treatment is al80 used, which allows the correlation of the antioxidant effect to the number of photons suppressed. Several well-known antioxidants (trolox, ascorbic and uric acid) were used to establish the methodology. TRAP values were calculated from the correlations between the number ofphotons suppressed and the antioxidant concentration, using trolox as reference compound. Using this methodology we were able to determine the antioxidant activity of Photomorphe umbellata extracts, and of its isolated major compound, 4-nerolidylcatechol. C(frações de 17 a23 e (O)) fração cromatográfica D(frações de 24 a 30). São apresentadas as intensidades dos picos, obtidos por detecção espectroscópica de UV-Visivel em 254 nm (em cima) e índice de refração (em baixo). Os tempos de retenção podem mostrar pequenas variações.","PeriodicalId":298864,"journal":{"name":"La industria lítica del núcleo urbano maya de La Blanca, Petén, Guatemala","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122562354","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}
The environment continues having an extraordinary importance in the training and learning of Primary School’s students, even though in recent times the interest in his study has falle Through the realization of this work, it is intended to return environment to the pedagogical place that had long time ago. The project presented here tries to show that regardless the size and characteristics of the place in which it develops, the environment provides knowledge and learning of a different nature but equally significant. That is why the project is centered on the town of Venta de Baños, a town of just 7.000 citizens located on the south of Palencia’s province, which offers a wide range of resources related to the characteristics and the particular history of the place. This allows students of primary school to know and identify their environment while they acquire the knowledge, skills and competencies expected for the stage.
环境在小学学生的培养和学习中仍然具有非凡的重要性，尽管最近他对学习的兴趣有所下降。通过这项工作的实现，它旨在将环境恢复到很久以前的教学场所。这里展示的项目试图表明，无论其开发地点的大小和特征如何，环境提供了不同性质但同样重要的知识和学习。这就是为什么该项目以Venta de Baños镇为中心，这是一个位于帕伦西亚省南部的小镇，只有7000名居民，这里提供了与当地特色和特殊历史相关的广泛资源。这让小学生了解和识别他们所处的环境，同时他们也获得了这个阶段所需的知识、技能和能力。
{"title":"Índice de gráficas","authors":"","doi":"10.2307/j.ctv233n76.17","DOIUrl":"https://doi.org/10.2307/j.ctv233n76.17","url":null,"abstract":"The environment continues having an extraordinary importance in the training and learning of Primary School’s students, even though in recent times the interest in his study has falle Through the realization of this work, it is intended to return environment to the pedagogical place that had long time ago. The project presented here tries to show that regardless the size and characteristics of the place in which it develops, the environment provides knowledge and learning of a different nature but equally significant. That is why the project is centered on the town of Venta de Baños, a town of just 7.000 citizens located on the south of Palencia’s province, which offers a wide range of resources related to the characteristics and the particular history of the place. This allows students of primary school to know and identify their environment while they acquire the knowledge, skills and competencies expected for the stage.","PeriodicalId":298864,"journal":{"name":"La industria lítica del núcleo urbano maya de La Blanca, Petén, Guatemala","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114131619","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}
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