Determinação de potássio por espectrometria de emissão atômica com chama em rochas silicáticas após decomposição ácida assistida por ultrassom.

Dissertação (Programa de Pós-Graduação em Química da Universidade Federal de Pelotas, como requisito parcial à obtenção do título de Mestre em Química. Orientadora: Profa. Dra. Mariana Antunes Vieira, Co-Orientador: Dr. Carlos Augusto Posser Silveira

Determinação de K em rochas silicáticas digeridas em ultrassom.

Nesse trabalho foi desenvolvido um método para a determinação de K em rochas silicáticas do tipo basalto (BA), monzogranito (MZ) e finos de xisto (FX) utilizando ultrassom (US) para digestão e análise pela técnica deespectrometria de emissãoatômica comchama (F AES), ? = 766,49 mn. A granulometria das três amostras foi 100%<0,3 mm

American palm ethnomedicine: A meta-analysis

<p>Abstract</p> <p>Background</p> <p>Many recent papers have documented the phytochemical and pharmacological bases for the use of palms (<it>Arecaceae</it>) in ethnomedicine. Early publications were based almost entirely on interviews that solicited local knowledge. More recently, ethnobotanically guided searches for new medicinal plants have proven more successful than random sampling for identifying plants that contain biodynamic ingredients. However, limited laboratory time and the high cost of clinical trials make it difficult to test all potential medicinal plants in the search for new drug candidates. The purpose of this study was to summarize and analyze previous studies on the medicinal uses of American palms in order to narrow down the search for new palm-derived medicines.</p> <p>Methods</p> <p>Relevant literature was surveyed and data was extracted and organized into medicinal use categories. We focused on more recent literature than that considered in a review published 25 years ago. We included phytochemical and pharmacological research that explored the importance of American palms in ethnomedicine.</p> <p>Results</p> <p>Of 730 species of American palms, we found evidence that 106 species had known medicinal uses, ranging from treatments for diabetes and leishmaniasis to prostatic hyperplasia. Thus, the number of American palm species with known uses had increased from 48 to 106 over the last quarter of a century. Furthermore, the pharmacological bases for many of the effects are now understood.</p> <p>Conclusions</p> <p>Palms are important in American ethnomedicine. Some, like <it>Serenoa repens </it>and <it>Roystonea regia</it>, are the sources of drugs that have been approved for medicinal uses. In contrast, recent ethnopharmacological studies suggested that many of the reported uses of several other palms do not appear to have a strong physiological basis. This study has provided a useful assessment of the ethnobotanical and pharmacological data available on palms.</p

The problem of constitutional legitimation: what the debate on electoral quotas tells us about the legitimacy of decision-making rules in constitutional choice

Proponents of electoral quotas have a ‘dependent interpretation’ of democracy, i.e. they have formed an opinion on which decision-making rules are fair on the basis of their prior approval of the outcomes these rules are likely to generate. The article argues that this position causes an irresolvable problem for constitutional processes that seek to legitimately enact institutional change. While constitutional revision governed by formal equality allows the introduction of electoral quotas, this avenue is normatively untenable for proponents of affirmative action if they are consistent with their claim that formal equality reproduces biases and power asymmetries at all levels of decision-making. Their critique raises a fundamental challenge to the constitutional revision rule itself as equally unfair. Without consensus on the decision-making process by which new post-constitutional rules can be legitimately enacted, procedural fairness becomes an issue impossible to resolve at the stage of constitutional choice. This problem of legitimation affects all instances of constitutional choice in which there are opposing views not only about the desired outcome of the process but also about the decision-making rules that govern constitutional choice

Determinação de potássio em rochas silicáticas por espectrometria de emissão atômica com chama após dissolução assistida por ultrassom.

Made available in DSpace on 2019-03-26T00:43:12Z (GMT). No. of bitstreams: 1 RosaneMartinazoBaldezetal2018v41n10a01.pdf: 2232831 bytes, checksum: 5f9dbd8a0e91d2eb1497fa9b74bc6b3d (MD5) Previous issue date: 2018bitstream/item/194968/1/Rosane-Martinazo-Baldez-et-al-2018-v41n10a01.pd

Determinação de potássio em rochas silicáticas por espectrometria de emissão atômica com chama após dissolução assistida por ultrassom.

Made available in DSpace on 2019-03-26T00:43:12Z (GMT). No. of bitstreams: 1 RosaneMartinazoBaldezetal2018v41n10a01.pdf: 2232831 bytes, checksum: 5f9dbd8a0e91d2eb1497fa9b74bc6b3d (MD5) Previous issue date: 2018bitstream/item/194968/1/Rosane-Martinazo-Baldez-et-al-2018-v41n10a01.pd