Bibliografías temáticas / Mineral-based activities

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Literatura académica sobre el tema "Mineral-based activities"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 10 de febrero de 2022

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Artículos de revistas sobre el tema "Mineral-based activities"

Yang, Yafeng, Huadong Wang, Huazhe Yang, et al. "Magnesium-Based Whitlockite Bone Mineral Promotes Neural and Osteogenic Activities." ACS Biomaterials Science & Engineering 6, no. 10 (2020): 5785–96. http://dx.doi.org/10.1021/acsbiomaterials.0c00852.

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Hassan, Siti Aishah, Salumiah Mijin, Umi Kalsom Yusoff, Phebe Ding, and Puteri Edaroyati Megat Wahab. "Nitrate, Ascorbic Acid, Mineral and Antioxidant Activities of Cosmos caudatus in Response to Organic and Mineral-Based Fertilizer Rates." Molecules 17, no. 7 (2012): 7843–53. http://dx.doi.org/10.3390/molecules17077843.

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Ghisler, M. "Review of the Survey's activities in 1987." Rapport Grønlands Geologiske Undersøgelse 140 (December 31, 1988): 5–7. http://dx.doi.org/10.34194/rapggu.v140.8022.

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Over the past few years many functions of the Ministry for Greenland have been transferred to the Greenland Home Rule Administration. FolIowing the reorganisation of the government after the general election in September 1987 the Ministry for Greenland was abolished and its remaining functions transferred to other ministries. The Geological Survey of Greenland, together with the Greenland Mineral Resources Administration and the Greenland Environment Research Institute were transferred to the Danish Ministry of Energy. The Minister of Energy, Svend Erik Hovmand, visited GGU in October. The sys

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Samuel, Alina Dora, Simona Bungau, Ilona Katalin Fodor, et al. "Effects of Liming and Fertilization on the Dehydrogenase and Catalase Activities." Revista de Chimie 70, no. 10 (2019): 3464–68. http://dx.doi.org/10.37358/rc.19.10.7576.

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In this paper we provide new data about the soil enzyme activity as a biological process, which is an indicator for impacts of factorial combinations of lime and fertilizers applications. Five plots divided into fifteen subplots were sampled for determination of the enzymatic indicators of soil quality, based on the actual and potential dehydrogenase and catalase activities. The research revealed that limed soil samples, in comparison with unlimed ones, resulted in significantly higher soil enzymatic activities (p[0.05) in the upper (0-20 cm), while in the deeper (20-40 cm) layer, only catalas

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Nath, Arijit, Máté Molnár, Attila Csighy, et al. "Biological Activities of Lactose-Based Prebiotics and Symbiosis with Probiotics on Controlling Osteoporosis, Blood-Lipid and Glucose Levels." Medicina 54, no. 6 (2018): 98. http://dx.doi.org/10.3390/medicina54060098.

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Lactose-based prebiotics are synthesized by enzymatic- or microbial- biotransformation of lactose and have unique functional values. In this comprehensive review article, the biochemical mechanisms of controlling osteoporosis, blood-lipid, and glucose levels by lactose-based prebiotics and symbiosis with probiotics are reported along with the results of clinical investigations. Interaction between lactose-based prebiotics and probiotics reduces osteoporosis by (a) transforming insoluble inorganic salts to soluble and increasing their absorption to gut wall; (b) maintaining and protecting miner

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Elbl, Jakub, Magdalena Vaverková, Dana Adamcová, et al. "Influence of Fertilization on Microbial Activities, Soil Hydrophobicity and Mineral Nitrogen Leaching." Ecological Chemistry and Engineering S 21, no. 4 (2015): 661–75. http://dx.doi.org/10.1515/eces-2014-0048.

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Abstract This work presents the analysis of the influence of compost and reclamation substrate addition and mineral fertilizers application on leaching of mineral nitrogen, microbial activities, soil hydrophobicity and plant biomass production. To demonstrate the effect of compost, reclamation substrate and mineral nitrogen (Nmin) addition on above parameters, the pot experiment was performed. As a model crop, Deschampsia caespitosa L. was used and cultivated for 63 days in climate chamber. The leaching of Nmjn was measured by application of ion exchange discs, soil hydrophobicity was determin

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Berenguer, R., N. Lima, L. Pinto, et al. "Cement-based materials: Pozzolanic activities of mineral additions are compromised by the presence of reactive oxides." Journal of Building Engineering 41 (September 2021): 102358. http://dx.doi.org/10.1016/j.jobe.2021.102358.

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Seifelnassr, Ahmed A. S., and Abdel-Zaher M. Abouzeid. "Exploitation of Bacterial Activities in Mineral Industry and Environmental Preservation: An Overview." Journal of Mining 2013 (December 29, 2013): 1–13. http://dx.doi.org/10.1155/2013/507168.

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Since the identification and characterization of iron and sulfur oxidizing bacteria in the 1940s, a rapid progress is being made in minerals engineering based on biological activities. Microorganisms can play a beneficial role in all facets of minerals processing, from mining to waste disposal and management. Some of the applications, such as biologically assisted leaching of copper sulfide ores, uranium ores, and biooxidation of refractory sulfide gold ores, are now established on the scale of commercial processes. A variety of other bioleaching opportunities exist for nickel, cobalt, cadmium

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Tikunov, Vladimir Sergeevich, Vitalii Semenovich Belozerov, and Stanislav Olegovich Antipov. "Evaluation of Tourist Activities and Destination Attraction Capacity Using Geotags." Kartografija i geoinformacije 18, no. 32 (2019): 34–43. http://dx.doi.org/10.32909/kg.18.32.3.

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Tourist location data accessible through social networks is a new source of information which is opening up great opportunities for studying tourism activities. We used tourist geotags from the VKontakte social network to evaluate the attractiveness of tourist destinations around the Caucasian Mineral Waters. Based on the data received from the public profiles of tourists publishing geotags, we analyzed their gender- and age-related structure, seasonal preferences, and geographic origins. The resort of Pyatigorsk was used as a case study to develop a classification of recreational areas for lo

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Olagoke, Folasade K., Klaus Kaiser, Robert Mikutta, Karsten Kalbitz, and Cordula Vogel. "Persistent Activities of Extracellular Enzymes Adsorbed to Soil Minerals." Microorganisms 8, no. 11 (2020): 1796. http://dx.doi.org/10.3390/microorganisms8111796.

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Adsorption of extracellular enzymes to soil minerals is assumed to protect them against degradation, while modifying their activities at the same time. However, the persistence of the activity of adsorbed enzymes remains poorly understood. Therefore, we studied the persistence of cellulase and α-amylase activities after adsorption to soil amended with various amounts (+1, +5, and +10 wt.%) of three typical soil minerals, montmorillonite, kaolinite, and goethite. Soil without mineral addition (pure soil), pure minerals, and pure dissolved enzymes were used as references. Soil mineral–enzyme com

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Tesis sobre el tema "Mineral-based activities"

Lima, Elis?ngela Maria de. "Doen?as respirat?rias associadas ? atividade de minera??o no munic?pio de Parelhas, regi?o do serid? norte-riograndense." Universidade Federal do Rio Grande do Norte, 2009. http://repositorio.ufrn.br:8080/jspui/handle/123456789/18197.

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Made available in DSpace on 2014-12-17T15:54:52Z (GMT). No. of bitstreams: 1 ElisangelaML.pdf: 3702195 bytes, checksum: 706cae0d6a157da81de334adcc48655b (MD5) Previous issue date: 2009-02-26 This work aims to characterize the workers in mineral activities exposed to lung injuries in Parelhas Municipality, Rio Grande do Norte State, seeking to relate respiratory diseases to the mining activity. The studied area (Parelhas City), with about 19,700 inhabitants, is located in the Serido region, approximately 232 km far from Natal City. The number of people involved in informal mining activity

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Capítulos de libros sobre el tema "Mineral-based activities"

Lau, RWL, KY Cheuk, EMS Tam, SSC Hui, JCY Cheng, and TP Lam. "Feasibility and effects of 6-month home-based digitally supported E-Fit program utilizing high-intensity interval exercises in girls with adolescent idiopathic scoliosis: a randomized controlled pilot study." In Studies in Health Technology and Informatics. IOS Press, 2021. http://dx.doi.org/10.3233/shti210466.

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Adolescent idiopathic scoliosis (AIS) patients have lower physical activities when compared with healthy controls, and are associated with lower bone mineral density (BMD), muscle strength and poorer quality of life (QoL). We aimed to assess the feasibility and effects of 6-month home-based digitally supported E-Fit comprised of high-intensity interval exercises for AIS patients. 40 AIS girls aged 11-14 were randomly assigned to E-Fit or control group. E-Fit group participated in an online 6-month home-based exercise program. At baseline, 6-months and 12-months follow-up, BMD using dual-energy X-ray absorptiometry, muscle functions, physical activity using Modified Baecke Questionnaire (MBQ), and QoL using Scoliosis Research Society-22 (SRS-22r) and feedback questionnaire were investigated. 14 in E-Fit and 16 in control group completed the study. Both groups had similar baseline characteristics. At 6-months, E-Fit group showed better improvement and significant interaction effect in left femoral neck bone mineral content (p=0.021) and isometric curl up test (p=0.04). Left arm lean mass showed better improvement between 6-months and 12-months follow-up (p=0.046) and whole-body areal BMD had significant interaction effect at 12-months follow-up (p=0.077). Improvement on self-image, work and sports participation were noted in E-Fit group across time. 70% of E-Fit participants were positive towards domestic application via online platform. E-Fit showed some benefits on bone health, muscle functions, physical activity and QoL measures. Current study indicated some potential physical and psychological benefits of E-Fit for AIS girls. E-Fit was feasible to conduct online at home and might have value of promoting exercise habits among relatively inactive AIS girls.

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"Advances in Understanding Landscape Influences on Freshwater Habitats and Biological Assemblages." In Advances in Understanding Landscape Influences on Freshwater Habitats and Biological Assemblages, edited by Arthur R. Cooper, Dana M. Infante, Jared A. Ross, et al. American Fisheries Society, 2019. http://dx.doi.org/10.47886/9781934874561.ch12.

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Abstract.—Fluvial threat assessments characterize the potential for fluvial habitat conditions to be degraded by differing types and intensities of anthropogenic activities occurring on the landscape, ultimately affecting stream biota. We present a threat assessment for fluvial habitats in Alaska based on six anthropogenic disturbance indices representing urbanization, agriculture/timber harvest, stream fragmentation, point-source pollution, infrastructure, and mines. These indices were combined to develop an overall index of contemporary threat of habitat alteration throughout Alaska using the 12-digit U.S. Geological Survey hydrologic unit code (HUC-12) framework (n = 13,997) and at a finer spatial resolution using local and network catchments for individual stream reaches within Southeast Alaska (n = 207,092). Overall, contemporary threat of habitat alteration indices showed that ~96% of fluvial habitats both statewide and for Southeast Alaska were at low or very low levels; however, anadromous fish habitats were under greater human pressure with nearly double the amount of moderately to severely disturbed habitats when compared to all fluvial habitats. We further evaluated potential future threats to fluvial habitats from mineral mining activities and climate change. More than 86% of existing mine claims statewide and 99% of claims in Southeast Alaska occur in areas of low and very low contemporary threat to fluvial habitats for anadromous fishes. Under climate change, July air temperatures are projected to increase ~1.9°C, on average, by mid-century within HUC-12s containing anadromous fish streams, indicating immense potential to warm streams with anadromous fishes within the state. This fluvial threat assessment demonstrates that overall threats from contemporary anthropogenic disturbance factors are generally low with localized areas of high intensity. However, future threats from mining and climate change have considerable potential to alter fluvial habitats for anadromous fishes in Alaska, particularly those currently unaltered by anthropogenic disturbances.

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Plant, Jane A., and Barry Smith. "Environmental Geochemistry on a Global Scale." In Geology and Health. Oxford University Press, 2003. http://dx.doi.org/10.1093/oso/9780195162042.003.0028.

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Recent population growth and economic development are extending the problems associated with land degradation, pollution, urbanization, and the effects of climate change over large areas of the earth’s surface, giving increasing cause for concern about the state of the environment. Many problems are most acute in tropical, equatorial, and desert regions where the surface environment is particularly fragile because of its long history of intense chemical weathering over geological timescales. The speed and scale of the impact of human activities are now so great that, according to some authors, for example, McMichael (1993), there is the threat of global ecological disruption. Concern that human activities are unsustainable has led to the report of the World Commission on Environment and Development Our Common Future (Barnaby 1987) and the establishment of a United Nations Commission on Sustainable Development responsible for carrying out Agenda 21, the action plan of the 1992 Earth Summit in Rio de Janeiro, Brazil. Considerable research into the global environment is now being undertaken, especially into issues such as climate change, biodiversity, and water quality. Relatively little work has been carried out on the sustainability of the Earth’s land surface and its life support systems, however, other than on an ad-hoc basis in response to problems such as mercury poisoning related to artisanal gold mining in Amazonia or arsenic poisoning as a result of water supply problems in Bangladesh (Smedley 1999). This chapter proposes a more strategic approach to understanding the distribution and behavior of chemicals in the environment based on the preparation of a global geochemical baseline to help to sustain the Earth’s land surface based on the systematic knowledge of its geochemistry. Geochemical data contain information directly relevant to economic and environmental decisions involving mineral exploration, extraction, and processing; manufacturing industries; agriculture and forestry; many aspects of human and animal health; waste disposal; and land-use planning. A database showing the spatial variations in the abundance of chemical elements over the Earth’s surface is, therefore, a key step in embracing all aspects of environmental geochemistry. Although environmental problems do not respect political boundaries, data from one part of the world may have important implications elsewhere.

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O'Brien, William. "Technology and Work Practices." In Prehistoric Copper Mining in Europe. Oxford University Press, 2014. http://dx.doi.org/10.1093/oso/9780199605651.003.0013.

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The production of copper in prehistory was a complex undertaking, involving a sequence of inter-related activities that required specialist knowledge and informed organization. The operation of early copper mines demanded a long-term commitment that had important implications for the societies in question. There are obvious parallels with modern mining in terms of the multi-stage nature of the process, from the initial search for copper ores to their extraction, treatment, and eventual conversion to metal. This explains why early mining is often characterized as an ‘industry’, with its own specialists and techniques. Given their professional background, it is not surprising that the earliest researchers in this field focused on the geological setting, technology, and engineering aspects of prehistoric copper mines. Modern research also deals with these aspects, but is more concerned with understanding the wider societal context of this activity. It is now recognized that any reconstruction of the chaîne opératoire of early copper mining cannot be based solely on technique and process, but needs to incorporate the dynamic social context of this activity. It also needs to recognize that human choice played a significant role in determining the process of mining. While some areas are not amenable to archaeological enquiry, a reconstruction of task structure and work routines should capture many aspects of decision making in these mines. This will be revisited in the next chapter to explore the distinctive nature of prehistoric mining communities and how they interacted with the external world. Before doing so, it is necessary to examine the process of mining in terms of the techniques employed and the work environment of these miners. The opening chapter of this book considered the concept of ore, as it would have applied in prehistory. The modern definition is essentially an economic one that relates the cost of mining a mineral deposit to perceived financial returns or strategic interests. The effort of extraction must be set against the concentration or ‘grade’ of metal present in the rock, which will determine whether it can be profitably extracted.

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Actas de conferencias sobre el tema "Mineral-based activities"

Morgan, Charles L. "The Status of Marine Mining Worldwide." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-80048.

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Metals are fundamental components of modern society worldwide, and, despite the current economic downturn, we know we will be faced with ever increasing demands and ever-shrinking supplies. Efforts to achieve sustainable supplies of minerals must include efforts to expand the supply. About 60% of the ocean surface consists of the ocean floor, so it is reasonable to expect that deep ocean minerals could contribute significantly to the world supply. Human efforts to recover minerals have thus far concentrated almost exclusively on land-based resources, so it is reasonable to postulate that marin

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Gernand, Jeremy M. "Evaluation of the Risk Reduction Effectiveness in OSHA’s Workplace Atmosphere Sampling Activities." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65942.

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The Occupational Safety and Health Administration (OSHA) in the United States is responsible for the promulgation and enforcement of rules to protect and enhance worker safety in most medium and large commercial enterprises. To that end, the agency has collected and processed more than 240,000 atmospheric samples of chemicals and aerosols in a variety of workplaces in the past 30 years. Though the agency spends more than $500 million per year even in the face of increasing overall employment, there exist only targeted evaluations of OSHA sampling activity for specific issues like formaldehyde

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Abdel Samad, Rim, Zulfa Al Disi, Mohammad Ashfaq, and Nabil Zouari. "The use of Principle Component Analysis and MALDI-TOF MS for the differentiation of mineral forming Virgibacillus and Bacillus species isolated from Sabkhas." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0069.

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Occurrence of mineral forming and other bacteria in mats is well demonstrated. However, their high diversity shown by ribotyping was not explained, although it could explain the diversity of formed minerals. Common biomarkers as well as phylogenic relationships are useful tools to clustering the isolates and predict their potential role in the natural niche. In this study, combination of MALDI-TOF MS with PCA was shown a powerful tool to categorize 35 mineral forming bacterial strains isolated from Dohat Fshaikh sabkha, at northwest of Qatar (23 from decaying mats and 12 from living ones). 23

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Richter, Anke, Vinzenz Brendler, Cordula Nebelung, Timothy E. Payne, and Thomas Brasser. "Sorption Databases for Increasing Confidence in Performance Assessment." In ASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2009. http://dx.doi.org/10.1115/icem2009-16053.

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World-wide activities focus on the remediation of radioactively contaminated sites. One common aim is to deliver a more profound chemical base for risk assessment, namely all those physico-chemical phenomena governing the contamination plume development in time and space. Coupled transport codes able to tackle this challenge have to simplify the resulting very complex reaction pattern. To do so in an adequate way requires extending the knowledge about retardation and mobilisation phenomena and the underlying basic processes and interactions (e.g. physisorption, chemisorption, surface precipita

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Lutsko, T. P., A. V. Osipova, and D. A. Skvortsov. "FEATURES OF CONCENTRATION OF SOME HEAVY METALS BY SORBENTS BASED ON VERMICULITE IN HYDROSPHERE OBJECTS." In "International Scientific and Practical Conference" THEORY AND PRACTICE OF VETERINARY PHARMACY, ECOLOGY AND TOXICOLOGY IN AIC ", dedicated to the centenary of the Department of Pharmacology and Toxicology, SPbSUVM. FSBEI HE St. Petersburg SUVM, 2021. http://dx.doi.org/10.52419/3006-2021-2-151-151.

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The problem of water quality occupies a crucial place in the system of nature protection and public health. Due to anthropogenic activities, heavy metals are one of the most common pollutants of natural waters. The natural mineral vermiculite has proven to be an effective absorber of trace amounts of heavy metals.

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