Gotowe bibliografie tematyczne / Alkaloid content

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Gotowa bibliografia na temat „Alkaloid content”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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Artykuły w czasopismach na temat "Alkaloid content"

Shukla, S., H. K. Yadav, A. Rastogi, B. K. Mishra, and S. P. Singh. "Alkaloid diversity in relation to breeding for specifi c alkaloids in opium poppy (Papaver somniferum L.)." Czech Journal of Genetics and Plant Breeding 46, No. 4 (2010): 164–69. http://dx.doi.org/10.17221/96/2009-cjgpb.

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Papaver somniferum is a chief source of diverse physiologically active alkaloids, required by the pharmaceutical industry. The present study describes the diversity of the alkaloid spectrum of 122 opium poppy accessions of Indian origin by means of a cluster analysis based on Mahalanobis generalised distances. The accessions could be grouped into 11 clusters according to their relationship between the contents of morphine, codeine, thebaine, narcotine and papaverine in raw opium. The diversity of the alkaloid spectrum of 11 clusters reflected the very low correlations between the contents of t

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Sun, Bo, Yu-Xiao Tian, Fen Zhang, et al. "Variations of Alkaloid Accumulation and Gene Transcription in Nicotiana tabacum." Biomolecules 8, no. 4 (2018): 114. http://dx.doi.org/10.3390/biom8040114.

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To increase the understanding of alkaloid biosynthesis in Nicotiana tabacum during whole plant growth periods, variations of the contents of alkaloids and the transcription of key biosynthetic genes in fresh leaves were investigated in three varieties at five developmental stages. Six alkaloids were analyzed by gas chromatograph–mass spectrometry (GC–MS) and the most abundant alkaloid was observed during the upper leaves maturing stage in the varieties, among which the alkaloid content of K326 was the highest. Considering the genetic effect, variance analysis indicated that the developmental s

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Chizzola, Remigius. "Pyrrolizidine Alkaloids in Adenostyles alliariae and A. glabra from the Austrian Alps." Natural Product Communications 10, no. 7 (2015): 1934578X1501000. http://dx.doi.org/10.1177/1934578x1501000710.

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The alkaloid content of Adenostyles alliariae and A. glabra (Asteraceae) has been evaluated. Both species contain toxic macrocyclic unsaturated pyrrolizidine alkaloids with seneciphylline as the main compound accounting for more than 90% of the alkaloid fraction in all above ground plant parts. Further alkaloids were spartioidine, acetyl-senciphylline and senecionine. Inflorescences showed the highest alkaloid contents with 21.1 and 13.4 mg/g in A. alliariae and A. glabra, respectively. Stems and leaves had 2–3 times lower contents. Therefore, these Adenostyles species must be considered as hi

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Liu, Jing, Kaifeng Shi, Jia Shi, et al. "A simple strategy to monitor the temporal and spatial distribution of alkaloids in sacred lotus leaves." Bioscience, Biotechnology, and Biochemistry 85, no. 6 (2021): 1332–40. http://dx.doi.org/10.1093/bbb/zbab038.

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ABSTRACT Owing to the high degree of diversity of metabolite pools and complexity of spatial and temporal distributions within biological tissues, currently available methods for metabolite characterization face large challenges. In this study, the temporal and spatial distributions of the alkaloid components of the medicinal plant lotus (Nelumbo nucifera) were investigated over various growth phases. The results showed that alkaloid biosynthesis in lotus leaf is regulated by development and that there is maximum accumulation of alkaloids when the lotus leaf was completely expanded. Furthermor

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Staples, Kristina D., Anwar A. Hamama, Regina Knight-Mason, and Harbans L. Bhardwaj. "Alkaloids in White Lupin and Their Effects on Symbiotic N Fixation." Journal of Agricultural Science 9, no. 6 (2017): 13. http://dx.doi.org/10.5539/jas.v9n6p13.

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Seeds of white lupin (Lupinus albus L.), known to potentially fix 150 to 200 kg/ha N via Symbiotic N Fixation (SNF), are classified as sweet or bitter based on their alkaloid contents: sweet lupins contain very low whereas bitter lupins contain high contents of alkaloids. However, precise information about effects of alkaloid content on SNF is not very well unknown. Experiments were conducted to determine if alkaloid content in the seed is related to that in other plant tissue such as leaves and pod shells, characterization of relationship between alkaloid concentration and SNF, and to study v

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Salma, Tarannum. "SPECTROPHOTOMETRIC ESTIMATION OF TOTAL ALKALOIDS IN CHITRAKA (PLUMBAGO ZEYLANICA LINN) USING BROMOCRESOL GREEN." Avishkara 01, no. 01 (2022): 03–05. http://dx.doi.org/10.56804/avishkara.2022.1102.

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Background: Plumbago zeylanica L. (Plumbaginaceae) commonly known, as Chitraka is pharmacologically important plant. Various studies have been undertaken to assess the pharmacological potential of different parts of the plant namely like roots, stem, flower, and leaves as antimicrobial, hepatoprotective, anticancer, antifertility, antiulcer, antifungal and wound healing. Chitraka is rich in alkaloids hence present study is taken. Objective: The objective of the present study was to determine the total alkaloid content in Chitraka Materials & Methods: The presence of alkaloids was confirmed

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Sari, Eni Kartika, Siti Maimunah, and Mega Karina Putri. "THE EFFECT OF MACERATION TIME ON TOTAL ALKALOID LEVELS IN BROCOLI (Brassica oleracea var. italica) BY USING UV-Vis SPECTROPHOTOMETRY METHOD." Jurnal Jamu Kusuma 2, no. 1 (2022): 38–46. http://dx.doi.org/10.37341/jurnaljamukusuma.v2i1.29.

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ABSTRACT Broccoli is known to be very rich in secondary metabolites, such as alkaloids, flavonoids, tannins, polyphenols, essential oils, and polypeptides. Alkaloids are one of the secondary metabolites that are commonly found in nature and have physiological activities. The extraction time factor is the thing that can affect the quality of the extraction results which in this study is the alkaloid content. This study aims to determine the optimal maceration time so that it can produce optimum total alkaloid content. The stages in this study include sample preparation and then sample ext

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Germán-Soto, Brianda Giselle, José Basilio Heredia, Nayely Leyva-López, et al. "Bioaccessibility and Antioxidant Capacity of Alkaloids from Microencapsulated Extract of Eggplant (Solanum melongena L.) Biomass." Horticulturae 10, no. 12 (2024): 1242. http://dx.doi.org/10.3390/horticulturae10121242.

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Eggplant is a vegetable grown worldwide, and due to quality standards, large amounts of biomass are generated after harvest. Biomass is considered a source of bioactive compounds with antioxidant properties. Therefore, this research aimed to evaluate the bioaccessibility (BA) and antioxidant capacity of microencapsulated alkaloids from eggplant fruit biomass. Eggplant biomass was collected, and the total alkaloid content, antioxidant capacity (TEAC, FRAP, and ORAC), and alkaloid profile (UPLC/MS) were determined before and after the in vitro digestion of encapsulated and non-encapsulated alkal

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Májer, Péter, and Éva Zámboriné Németh. "Alkaloid Accumulation and Distribution within the Capsules of Two Opium Poppy (Papaver somniferum L.) Varieties." Plants 13, no. 12 (2024): 1640. http://dx.doi.org/10.3390/plants13121640.

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The goal of this study was to clarify the role of capsule size and morphology in the alkaloid yield of poppy. In 2023, two industrial varieties from large-scale cultivation were investigated. Three classes of capsule size (large, medium, and small) and four organelles (wall, placenta, disc, and thalamus) of the seedless capsule were studied for their mass proportions and alkaloid contents. In ‘Meara’, large capsules had 41% lower total alkaloid levels than smaller ones. In ‘Morgana’, there was no difference in total alkaloids between size groups, but large capsules had higher contents of codei

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Galek, R., E. Sawicka-Sienkiewicz, D. Zalewski, S. Stawiński, and K. Spychała. "Searching for low alkaloid forms in the Andean lupin (Lupinus mutabilis) collection." Czech Journal of Genetics and Plant Breeding 53, No. 2 (2017): 55–62. http://dx.doi.org/10.17221/71/2016-cjgpb.

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The Andean lupin (Lupinus mutabilis Sweet) is the only cultivated species of the genus Lupinus originating from South America. Attempts were made to introduce this species to European soil and climatic conditions. The main disadvantages of the Andean lupin include too long and non-uniform maturation of pods in a plant, dropping flowers and pod buds, and a high alkaloid content (up to 5%). The aim of this study was to identify in post-mutagen treated material genotypes with low alkaloid content in seeds, which would be useful for improving L. mutabilis by breeding. The iodine test was annually

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Rozprawy doktorskie na temat "Alkaloid content"

Grue, Margaret Ruth. "A study of the alkaloid content of the Senecio speciosus/Macrocephalus complex." Thesis, Rhodes University, 1992. http://hdl.handle.net/10962/d1005027.

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The isolation and identification of pyrrolizidine alkaloids from various plant species from 1988 to May 1991 are reviewed and the alkaloids of two indigenous plant species, Senecio speciosus Willd and Senecio macrocephalus DC, were investigated. A brief review of the methods used for isolation and identification of pyrrolizidines is also given. S. speciosus was found to contain two new alkaloids, 7-senecioyl-9-sarracinylheliotridine and 7-isosarracinyl-9- sarracinyl-heliotridine, which were identified using highfield NMR techniques. A number of other alkaloids were tentatively identified using

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Fung, Christine Louise. "The alkaloidal content of A. napellus L. (Aconitum)." Thesis, University of Liverpool, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297087.

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Wolf, Jean-Pierre. "Synthese und Strukturaufklärung optisch aktiver Alkaloide aus Catha edulis Forsk /." [S.l : s.n.], 1987. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.

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Radi, Peter. "Laserspektroskopie von homo- und heteronuklearen Alkali-Trimeren /." [S.l : s.n.], 1986. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.

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Halaweh, Mahmoud. "Effect of alkalis and sulfates on Portland cement systems." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0002120.

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Sarmah, Ajit K. "Persistence and mobility of triasulfuron, metsulfuronmethyl, and chlorsulfuron in alkaline soils." Title page, abstract and contents only, 1998. http://web4.library.adelaide.edu.au/theses/09PH/09phs2461.pdf.

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Bibliography: leaves 157-174. This study examined the fate of three common sulfonylurea herbicides in highly alkaline soils through a series of laboratory and field experiments to determine if existing leaching models could be used to describe their field behaviour under Australian climatic conditions. A liquid chromatographic method was developed to simultaneously determine levels of triasulfuron, metsulfuronmethyl, and chlorsulfuron in soil and water. The investigation of base hydrolysis for the herbicides in aqueous buffer and soil solutions determined that it was unlikely to be a major los

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Elgayar, Iman. "The influence of alkali metal content and network connectivity on bioactive glasses." Thesis, Imperial College London, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.415447.

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Mattle, Daniel. "Preventive treatment of nephrolithiasis with alkali citrate : a critical review /." Bern : [s.n.], 2005. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.

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Goshayeshi, Niloufar. "Contribution to the Development of Analytical Models to Forecast Alkali-Aggregate Reaction (AAR) Kinetics and Induced Expansion." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39553.

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Alkali-aggregate reaction (AAR) is one of the most harmful distress mechanisms affecting the durability and serviceability of concrete infrastructure worldwide. Currently, there is a need to forecast future behaviour of AAR-affected concrete, and thus analytical and numerical models have been developed over the years. Larive developed a model in 1998 that is able to describe the behaviour of concrete samples in the laboratory. This model has been widely accepted and used by AAR community, even to predict the behaviour of concrete structures in the field. Larive’s model is based upon three main

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Whitfield, Troy T. "Effect of Tricalcium Silicate Content on Expansion in Internal Sulfate Attack." Scholar Commons, 2006. http://scholarcommons.usf.edu/etd/3802.

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The purpose of this study was to determine the cementitious parameters and placement temperature that impact internal sulfate attack in concrete. Concrete structures make up a large percentage of the infrastructure and multifamily housing. Durability is very important. Cements can be formulated to reduce the impact of external environmental exposure such as high salinity from marine environments or high sulfate levels from soils or surface waters. Concrete is also subject to internal attack such as alkali aggregate reaction, (AAR), and delayed ettringite formation, (DEF). This study focused on

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Książki na temat "Alkaloid content"

1921-, Pavlides Louis, ed. Early Paleozoic alkalic and calc-alkalic plutonism and associated contact metamorphism, central Virginia Piedmont. U.S. G.P.O., 1994.

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Boddy, Andrea M. The effect of product form and silica content of silica fume on its ability to control alkali-silica reaction. National Library of Canada, 2000.

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Változó korunk-változó nyelvünk: Esszék, reflexiók, alkalmi szövegek. Komp-Press, 2011.

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Halperin, Mitchell L., and Kamel S. Kamel. Approach to the patient with metabolic acidosis or alkalosis. Edited by Robert Unwin. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780199592548.003.0035_update_001.

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The pathophysiology, clinical approach, and management of the common causes of metabolic acidosis and alkalosis are discussed. In metabolic acidosis, a quantitative estimate of the extracellular volume (ECFV) is required to determine its content of bicarbonate in a patient with ECFV contraction. Buffering of H+ must occur by the bicarbonate buffer system in muscle to avoid binding to intracellular proteins, this requires low muscle capillary PCO2; acid gain type of metabolic acidosis is detected by the finding of new anions in blood and/or urine. The urine osmolal gap is the best indirect test

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Joynt, Gavin M., and Gordon Y. S. Choi. Blood gas analysis in the critically ill. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0072.

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Arterial blood gases allow the assessment of patient oxygenation, ventilation, and acid-base status. Blood gas machines directly measure pH, and the partial pressures of carbon dioxide (PaCO2) and oxygen (PaO2) dissolved in arterial blood. Oxygenation is assessed by measuring PaO2 and arterial blood oxygen saturation (SaO2) in the context of the inspired oxygen and haemoglobin concentration, and the oxyhaemoglobin dissociation curve. Causes of arterial hypoxaemia may often be elucidated by determining the alveolar–arterial oxygen gradient. Ventilation is assessed by measuring the PaCO2 in the

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Eddy, Matthew Daniel, and Ursula Klein, eds. A Cultural History of Chemistry in the Eighteenth Century. Bloomsbury Publishing Plc, 2022. http://dx.doi.org/10.5040/9781474203760.

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A Cultural History of Chemistry in the Eighteenth Century covers the period from 1700 to 1815. Setting the progress of science and technology in its cultural context, the volume re-examines the changes that many have considered to constitute a “chemical revolution”. Already boasting a laboratory culture open to both manufacturing and commerce, the discipline of chemistry now extended into academies and universities. Chemists studied myriad materials – derived from minerals, plants, and animals – and produced an increasing number of chemical substances such as acids, alkalis, and gases. New tex

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Beckett, Martyn Frank. Phase relations in synthetic alkali-bearing dolomite carbonatites and the effect of alkalinity and fluorine content on the solubility of pyrochlore and the formation of nobium deposits in carbonatites. 1987.

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Pontin, Ben. Nuisance Law, Regulation, and the Invention of Prototypical Pollution Abatement Technology. Edited by Roger Brownsword, Eloise Scotford, and Karen Yeung. Oxford University Press, 2016. http://dx.doi.org/10.1093/oxfordhb/9780199680832.013.73.

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The emerging idea that the private enforcement of nuisance injunctions can facilitate investment in pollution abatement technology raises important questions of the wider regulatory context of this area of tort. This chapter examines the role of the Alkali Inspectorate historically in facilitating progressive improvements in industrial production process standards to an extent comparable with nuisance law. It is argued that regulation in this field has demonstrably shaped the development of pollution abatement technology, but exceptionally so. The notion of ‘voluntarism’, which tort scholars h

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Części książek na temat "Alkaloid content"

Tapas, M. J., K. Vessalas, P. Thomas, N. Gowripalan, and V. Sirivivatnanon. "Composition of Alkali–Silica Reaction Products in Laboratory and Field Concrete." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3330-3_5.

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AbstractThis study investigated the composition of alkali–silica reaction (ASR) products formed in mortar and concrete that underwent accelerated ASR testing using two test methods: the accelerated mortar bar test (AMBT) and the simulated pore solution immersion test (SPSM). The composition of the ASR products formed in the accelerated tests was compared with those in a 25-year old bridge in New South Wales demolished due to ASR. Results showed that the ASR products inside an aggregate contained calcium (≈20%), silicon (≈60%), and alkalis (≈20%) regardless of the ASR test method used. The ASR

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Provis, John L., and Susan A. Bernal. "Binder Chemistry – Blended Systems and Intermediate Ca Content." In Alkali Activated Materials. Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-7672-2_5.

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Hwalla, Joud, Mariane Saba, Joseph Assaad, and Hilal El-Hassan. "Performance of Metakaolin-Based Alkali-Activated Mortar for Underwater Placement." In Lecture Notes in Civil Engineering. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-69626-8_9.

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AbstractThis study assesses the performance of metakaolin (MK)-based alkali-activated geopolymers as potential materials for underwater applications. Mortars were formulated using gradually higher sand volumes, which resulted in binder-to-sand ratios varying from 1:3 to 1:1.85 and 1:0.8. The alkali-activated solution (AAS) was produced using sodium silicate and sodium hydroxide. The AAS was adjusted to achieve a flow of 16 and 22 ± 1 cm while the setting times, plastic viscosity, washout loss, and 28-day compressive strengths were determined. Generally, an increase in AAS content prolonged set

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Kroll, H., C. Krause, and G. Voll. "Disordering, Re-Ordering and Unmixing in Alkali Feldspars from Contact-Metamorphosed Quartzites." In Equilibrium and Kinetics in Contact Metamorphism. Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-76145-4_13.

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Davoodabadi, Maliheh, Marco Liebscher, Massimo Sgarzi, et al. "Electrical and Sulfate-Sensing Properties of Alkali-Activated Nanocomposites." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3330-3_29.

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AbstractWe investigated the formation of the conductive network of carbon nanotubes (CNTs) in alkali-activated nanocomposites for sulfate-sensing applications. The matrix was a one-part blend of fly ash and ground granulated blast-furnace slag, activated by sodium silicate and water. Sodium dodecylbenzenesulfonate was used as the surfactant for dispersion of the CNTs in the aqueous media. The nanocomposites were investigated by a laboratory-developed setup to study the electrical and sensing properties of the alkali-activated material. The electrical properties (i.e., conductivity) were calcul

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Martin, L., P. Thomas, P. De Silva, and V. Sirivivatnanon. "Role of Aggregate Reactivity, Binder Composition, and Curing Temperature on the Delayed Ettringite Formation and Associated Durability Loss in Concrete." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3330-3_11.

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AbstractThe durability of concrete is critical to its worldwide use as a structural material for buildings and infrastructure, with the lifetime service of concrete greatly affecting its economic, environmental, and social costs. Causes of durability loss in some concrete structures can be attributed to the alkali–silica reaction (ASR) and delayed ettringite formation (DEF). Both are chemical reactions that have the potential to cause expansion and strength loss in affected elements. Significant overlap exists in the factors contributing to ASR and DEF in concrete structures, with widely repor

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Rybiński, W., M. Kroc, W. Święcicki, et al. "Preliminary Estimation of Variation of Alkaloids Content in White Lupin (Lupinus albus L.) Collection." In Breeding Grasses and Protein Crops in the Era of Genomics. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-89578-9_24.

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Rahmat, Somayeh, and Zhaleh Soheilikhah. "Arbuscular Mycorrhizal Fungi and Plant Secondary Metabolism." In Arbuscular Mycorrhizal Fungi and Higher Plants. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-8220-2_5.

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AbstractPlants synthetize and accumulate a various class of organic compounds known as secondary metabolites (SMs). Although SMs do not play a crucial role as primary metabolites in plant growth and development, they are of high ecological significance. Humans use these compounds in the pharmaceutical industry. One of the results of mutual symbiotic association between plants and arbuscular mycorrhizal fungi (AMF) is the reprogramming of metabolic pathways and modulating the range and content of plant SMs such as phenolics, terpenoids, and alkaloids. Many of SMs act as signals for multiple int

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McCloy, J. S., C. Rodriguez, C. Windisch, et al. "Alkali/Akaline-Earth Content Effects on Properties of High-Alumina Nuclear Waste Glasses." In Ceramic Transactions Series. John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470930991.ch7.

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Li, Yongxiang, Lijuan Yang, Xiao Li, Yongfei Li, Qiang Zhang, and Shoude Pang. "Mechanical Properties and Micromechanism of Geopolymers to Replace Cement Stabilized Crushed Stone." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1748-8_4.

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AbstractIn order to realize the resource utilization of solid waste, the principle of alkali excitation is used to prepare geopolymers with fly ash, mineral powder and wet carbide slag as the main materials to replace part of the cement as the cementing material for the pavement base. Geopolymer-stabilized crushed stone was prepared by compounding cement and aggregate with geopolymer, and the unconfined compression strength, indirect tensile strength, compression rebound modulus, scour resistance and microscopic X-ray diffraction (XRD) and scanning electron microscopy (SEM) tests were carried

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Streszczenia konferencji na temat "Alkaloid content"

Baker, Brian A., and Gaylord D. Smith. "Corrosion Resistance of Alloy 740 as Superheater Tubing in Coal-Fired Ultra-Supercritical Boilers." In CORROSION 2004. NACE International, 2004. https://doi.org/10.5006/c2004-04526.

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Abstract The nature of coal ash corrosion and factors affecting its severity are examined. Laboratory results for iron- and nickel-base alloys from a number of sources are compared. Flue gas composition (SO2 content), coal ash alkali sulfate content, surface temperature and alloy composition are related to corrosion behavior. Results from in situ plant exposures will also be discussed; the role of key alloying elements will be addressed.

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Smith, G. D., S. J. Patel, N. C. Farr, and M. Hoffmann. "The Corrosion Resistance of Nickel-Containing Alloys in Coal-Fired Boiler Environments." In CORROSION 1999. NACE International, 1999. https://doi.org/10.5006/c1999-99055.

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Abstract This paper examines the nature of coal ash/flue gas corrosion and factors influencing its degree of aggressiveness. Citing both laboratory and plant experience, the performance of a number of nickel-containing alloys are assessed as to their general performance limits based on corrosion resistance. The role of certain key alloying elements is addressed. Corrosion behavior is examined in terms of chromium content of the alloy, the SO2/SO3 content of the flue gas, the alkali content of the coal ash and the surface temperature of the alloy exposed to the environment.

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Cha, S. C., and M. Spiegel. "Studies on the Local Reactions of Alkali Chloride Particles on Metal Surfaces." In CORROSION 2004. NACE International, 2004. https://doi.org/10.5006/c2004-04533.

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Abstract During biomass combustion alkali chloride particles are formed, depositing on the metallic surface or on the already formed oxide layer. Subsequently, they react with the metal or the oxide layer and accelerate the oxidation process. To investigate these reactions an equipment for the particles deposition by impactor and thermophoresis was installed and optimized for the homogenous deposition. After deposition of KCl, iron samples were exposed to N2-O2 and N2-O2-HCl atmospheres for short times at 300°C. In N2-O2, some deformation and local spreading of the particles were observed, pro

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Geng, G. Q., B. Q. Wang, and Alan V. Levy. "The Effect of Fluidized Bed Combustor Bed Materials Compositions on the Erosion-Corrosion of Carbon Steel." In CORROSION 1990. NACE International, 1990. https://doi.org/10.5006/c1990-90290.

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Abstract The relative amounts of SiO2, CaO, CaCO3,CaSO4, and alkali compounds in the bed materials of circulating fluidized bed combustors determined the metal wastage of heat exchanger tubing alloys exposed to the particles. The ratio of SiO2 to CaO and to CaCO3 is especially important in determining the erosivity of the bed materials. It was found that increasing this ratio increased the metal wastage. A sharp transition ratio occurred on either side of which the metal wastages were linear. The slope of the linear curve was low for the lower sand content mixtures and higher for higher sand c

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Kelley, DH, and MJ Thompson. "The Corrosion Resistance of Thermoset Composites in Alkaline Environments." In CORROSION 1998. NACE International, 1998. https://doi.org/10.5006/c1998-98457.

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Abstract Corrosion engineers need guidelines for selecting thermoset resins for aggressive applications such as hot alkali and alkaline peroxide. The suitability of fiberglass-reinforced plastic (FRP) for alkaline service depends on factors such as the ester content of the resin, the unsaturated monomer composition, and the cure system. The purpose of the present paper is to show the effect of these factors on the alkaline corrosion resistance of FRP and provide corrosion engineers with the guidance needed for selecting the best epoxy vinyl ester resins for alkaline environments.

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Flounders, Emer C., and Marshall K. Judges. "Corrosion Condition Evaluation of Reinforced Concrete Tanks in the National Aquarium in Baltimore." In CORROSION 1994. NACE International, 1994. https://doi.org/10.5006/c1994-94284.

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Abstract Two oval shaped reinforced concrete tanks built one over the other, exhibited significant concrete damage in addition to cracking. The annular space between the walls of the tanks are filled with man made sea water for marine life habitation. Cracks were observed on the walls and the floor slabs. It was suspected that the cracks may be active and that a change in width would occur over time, allowing access of chloride saturated sea water to the reinforcing steel. A detailed field survey was performed to evaluate the condition of the tanks. Select cracks were monitored to determine wh

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Li, Yuanshi, Yan Niu, and Weitao Wu. "Accelerated Corrosion of Pure Fe, Cr, Ni and Several Fe-based Alloys Induced by ZnCl2-KCl at 450 °C in Pure O2." In CORROSION 2001. NACE International, 2001. https://doi.org/10.5006/c2001-01158.

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Abstract Corrosion problems in waste incinerators are usually very severe, also due to the presence of low-melting point heavy and alkali metal chlorides. In this paper, the corrosion behavior of several Fe-based alloys with different Cr content, as well as three pure metals Fe, Cr, and Ni, was studied at 450°C beneath ZnCl2-KCl deposits in flowing pure oxygen. All the materials suffered from accelerated corrosion, characterized by an important separation and spallation of the oxide scales. The Cr-containing alloys did not exhibit better corrosion resistance to this environment due to the poor

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Miyasaka, Akihiro. "Thermodynamic Estimation of PH of Sour and Sweet Environments as Influenced by the Effects of Anions and Cations." In CORROSION 1992. NACE International, 1992. https://doi.org/10.5006/c1992-92005.

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Abstract A new technique was proposed for estimating the pH of concentrated aqueous solutions in equilibrium with high pressure H2S and CO2 from ambient to elevated temperatures. The effects of co-existing anions (carbonate and sulfate) and cations (alkali and alkali-earth metal ions) were taken into consideration through their influence on dissociation equilibria as well as on activity coefficients. The physico-chemical parameters were obtained by thermodynamic estimation; the H2S and CO2 solubility constants were calculated by a Correspondence principle, and the dissociation constants of H2S

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Talus, Annika, Rikard Norling, and Alice Moya Núñez. "Influence of Pb and Cl in Waste Wood Fuel on Furnace Wall Corrosion of Low Alloyed Steel and Alloy 625." In CONFERENCE 2024. AMPP, 2024. https://doi.org/10.5006/c2024-21033.

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Abstract Firing waste wood in thermal power plants can lead to furnace wall corrosion due to corrosive elements such as chlorine, heavy metals, and alkali metals present in the fuel. This study investigates the influence of lead and chlorine on furnace wall corrosion of a low alloyed steel (16Mo3) and a nickel-based alloy (Alloy 625) during two field exposures using an air-cooled probe. Two two-week long test campaigns firing two different waste wood fuels (higher and lower lead and chlorine content) were carried out, exposing samples having metal temperatures in the interval 350-400 °C. The c

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Kawamura, H., H. Hirano, M. Koike, and M. Suda. "Inhibitory Effect of Boric Acid on Intergranular Attack and Stress Corrosion Cracking of Alloy 600 in High Temperature Water." In CORROSION 1995. NACE International, 1995. https://doi.org/10.5006/c1995-95408.

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Abstract The inhibitory effect of boric acid on the Intergranular Attack and Stress Corrosion Cracking (IGA/SCC) propagation behavior of steam generator (SG) tubing was studied under accelerated test conditions. Based on the analysis results of stress intensity factors at IGA/SCC crack tips, the notched C-ring tests were carried out to evaluate the effect of stress intensity and boric acid on the IGA/SCC crack propagation. The A.C. impedance measurement and Auger electron spectroscopy (AES) were also conducted to clarify the inhibitory effect of boric acid. Notched C-ring test results indicate

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Raporty organizacyjne na temat "Alkaloid content"

Committee on Toxicology. New Approach Methodologies (NAMs) In Regulatory Risk Assessment Workshop Report 2020- Exploring Dose Response. Food Standards Agency, 2024. http://dx.doi.org/10.46756/sci.fsa.cha679.

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The UK Food Standards Agency (FSA) and the Committee on Toxicity of Chemicals in Food, Consumer Products and the Environment (COT) held an “Exploring Dose Response” workshop in a multidisciplinary setting inviting regulatory agencies, government bodies, academia and industry. The workshop provided a platform from which to address and enable expert discussions on the latest in silico prediction models, new approach methodologies (NAMs), physiologically based pharmacokinetics (PBPK), future methodologies, integrated approaches to testing and assessment (IATA) as well as methodology validation. U

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Bansal, Shubhra, Theresa Friedlmeier, Marco Nardone, Kyoung Kweon, and Vincenzo Lordi. Metastability and Long-Term Degradation in CIGS Devices: Effect of Alkali Treatments, Back Contact and Emitter Layers. Office of Scientific and Technical Information (OSTI), 2020. http://dx.doi.org/10.2172/1773027.

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Corriveau, L., and E. G. Potter. Advancing exploration for iron oxide-copper-gold and affiliated deposits in Canada: context, scientific overview, outcomes, and impacts. Natural Resources Canada/CMSS/Information Management, 2024. http://dx.doi.org/10.4095/332495.

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The Geo-mapping for Energy and Minerals (GEM) and Targeted Geoscience Initiative (TGI) programs conducted extensive collaborative research on mineral systems with iron oxide-copper-gold (IOCG) and affiliated deposits in prospective settings of Canada. Regional alteration mapping as well as geochemical and geophysical modelling undertaken under the GEM program documented the evolution of polymetallic metasomatic systems with iron-oxide and alkali-calcic alteration and led to an increased recognition of the mineral potential of poorly explored areas and historic deposits of the Great Bear magmat

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Ramnaraine, Daveena. Beyond Antibiotics: Exploring the Antibacterial Mechanisms and Efficacy of Medicinal Plants and Endophytic Fungi. Florida International University, 2025. https://doi.org/10.25148/fiuurj.3.1.14.

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Due to the overuse of antibiotics, antibiotic resistance has become a global health crisis, and has forced an exploration of alternative antibacterial agents. This review explores natural solutions through the antibacterial potential of medicinal plants and their symbiotic endophytic fungi. Medicinal plants have been utilized for centuries to treat infections because of their rich phytochemical content, including alkaloids, flavonoids, and saponins, which exhibit antibacterial properties. Their efficacy is measured through minimum inhibitory concentration (MIC) assays, which showcase their abi

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