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1

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A contribution to the modelling of an analytical column process (1980)

Mota, M. M. Guedes ; Eelderink, G. H. B. ; Verbruggen, H. B. ; [et al.]

Springer

Fresenius' Zeitschrift für analytische Chemie 304 (1980), S. 1-5

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ISSN: 1618-2650

Keywords: Chromatographie, Ionenaustausch ; Modellbildung, Messungen

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Description / Table of Contents: Summary A description of the way of obtaining the necessary experimental information for modelling an ion-exclusion column (polystyrene/sulphonic acid resin in the H+-form; elution of HCl) is given together with its results. A model for the detection system is obtained.

Notes: Zusammenfassung Eine Methode wird beschrieben, die die notwendigen experimentellen Daten zur Modellbildung einer Ionen-Exklusions-Säule (Polystyrol/ Sulfonsäure-Harz in der H+-Form; Eluierung von HCl) liefert. Die Ergebnisse werden angegeben. Ein Modell der Detektion wurde aufgestellt.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00467294

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Fluvial Erosion Characterisation in the Juqueriquerê River Channel, Caraguatatuba, Brazil (2016)

Victor F. Velázquez, Viviane D. A. Portela, José M. Azevedo Sobrinho, Antonio C. M. Guedes, Mikhaela A. J. S. P letsch

Canadian Center of Science and Education

In: Earth Science Research (ESR)

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Publication Date: 2016-06-06

Description: The Juqueriquerê River channel was formed in a Precambrian crystalline basement. The lithological association is largely composed of ancient metamorphic and igneous rocks, with several overlapping tectonic episodes. Field surveys along the upper and middle course allowed for cataloguing a wide variety of fluvial erosion features. A sizable amount of morphological features have been sculpted on different types of rocks, including furrows, potholes, percussion marks, polishing and smoothing boulders as the most representative. The sizes and shapes of these scour marks are also diverse, and their study has provided important results for better understanding the erosive processes. Given their wide variety, the erosive morphological features offer an excellent opportunity to explore the mechanisms of fluvial erosion and evaluate their effective capacity to remove cobbles and boulders in bedrock river systems.

Print ISSN: 1927-0542

Electronic ISSN: 1927-0550

Topics: Geosciences

Published by Canadian Center of Science and Education

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Reaction Mechanisms in Al2O3/CuO Infiltration by Liquid Al (2012)

M. Guedes, J. M. F. Ferreira, A. C. Ferro

Wiley

In: Journal of the American Ceramic Society

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Publication Date: 2012-07-10

Description: This work studies reactive mechanisms involved in liquid Al infiltration of green preforms containing tailored amounts of Al 2 O 3 and CuO . Infiltration reactions involving Al and copper oxides are expected to produce Al 2 O 3 , as fine particulate reinforcements, and Cu , as Al -matrix strengthener. Preforms with 75 mol%- CuO were infiltrated with Al at 1000°C and 1100°C in air. Under low P O 2 , copper oxides are reduced to Cu , blocking the opportunity for reactive infiltration. Also, the Al - Cu / Al 2 O 3 contact angle is insufficiently low to drive spontaneous infiltration. At 1000°C, infiltration is incipient, indicating that CuO reaction with Al is not sufficiently vigorous to destabilize enveloping Al 2 O 3 . At 1100°C, CuO reduces to Cu 2 O and infiltration is triggered, although the process is incomplete due to formation of a compact Al 2 O 3 layer which inhibits metal supply to the reaction front. At or behind the halted infiltration front consumption of starting Al 2 O 3 particles and formation of CuAlO 2 occur. The space among these phases is occupied by a Cu -rich matrix, rendering an almost totally densified microstructure. This study shows that liquid Al infiltration of Al 2 O 3 / CuO greens is possible at 1100°C, in air, due to destabilization of the Al 2 O 3 enveloping film and reactive infiltration, promoted by the redox reaction between Al and copper oxide.

Print ISSN: 0002-7820

Electronic ISSN: 1551-2916

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Published by Wiley

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Pyogenic bacterial infections in humans with MyD88 deficiency (2008)

H. von Bernuth ; C. Picard ; Z. Jin ; [et al.]

American Association for the Advancement of Science (AAAS)

In: Science. 321(5889): 691-6. doi: 10.1126/science.1158298.

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Publication Date: 2008-08-02

Description: MyD88 is a key downstream adapter for most Toll-like receptors (TLRs) and interleukin-1 receptors (IL-1Rs). MyD88 deficiency in mice leads to susceptibility to a broad range of pathogens in experimental settings of infection. We describe a distinct situation in a natural setting of human infection. Nine children with autosomal recessive MyD88 deficiency suffered from life-threatening, often recurrent pyogenic bacterial infections, including invasive pneumococcal disease. However, these patients were otherwise healthy, with normal resistance to other microbes. Their clinical status improved with age, but not due to any cellular leakiness in MyD88 deficiency. The MyD88-dependent TLRs and IL-1Rs are therefore essential for protective immunity to a small number of pyogenic bacteria, but redundant for host defense to most natural infections.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2688396/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉 〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2688396/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉von Bernuth, Horst -- Picard, Capucine -- Jin, Zhongbo -- Pankla, Rungnapa -- Xiao, Hui -- Ku, Cheng-Lung -- Chrabieh, Maya -- Mustapha, Imen Ben -- Ghandil, Pegah -- Camcioglu, Yildiz -- Vasconcelos, Julia -- Sirvent, Nicolas -- Guedes, Margarida -- Vitor, Artur Bonito -- Herrero-Mata, Maria Jose -- Arostegui, Juan Ignacio -- Rodrigo, Carlos -- Alsina, Laia -- Ruiz-Ortiz, Estibaliz -- Juan, Manel -- Fortuny, Claudia -- Yague, Jordi -- Anton, Jordi -- Pascal, Mariona -- Chang, Huey-Hsuan -- Janniere, Lucile -- Rose, Yoann -- Garty, Ben-Zion -- Chapel, Helen -- Issekutz, Andrew -- Marodi, Laszlo -- Rodriguez-Gallego, Carlos -- Banchereau, Jacques -- Abel, Laurent -- Li, Xiaoxia -- Chaussabel, Damien -- Puel, Anne -- Casanova, Jean-Laurent -- U19 AI057234/AI/NIAID NIH HHS/ -- U19 AI057234-02/AI/NIAID NIH HHS/ -- U19 AIO57234-02/PHS HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2008 Aug 1;321(5889):691-6. doi: 10.1126/science.1158298.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Human Genetics of Infectious Diseases, INSERM U550, Paris, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18669862" target="_blank"〉PubMed〈/a〉

Keywords: Adolescent ; Animals ; Bacterial Infections/*genetics/*immunology ; Cell Line, Transformed ; Child ; Child, Preschool ; Cytokines/metabolism ; Disease Susceptibility ; Female ; Gene Deletion ; Humans ; Immunity, Innate ; Male ; Mice ; Mutation, Missense ; Myeloid Differentiation Factor 88/*deficiency/genetics/metabolism ; Pneumococcal Infections/genetics/immunology ; Pseudomonas Infections/genetics/immunology ; Receptors, Interleukin-1/immunology/metabolism ; Signal Transduction ; Staphylococcal Infections/genetics/immunology ; Toll-Like Receptors/immunology/metabolism ; Transfection

Print ISSN: 0036-8075

Electronic ISSN: 1095-9203

Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics

Published by American Association for the Advancement of Science (AAAS)

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Geochemical and temporal provinciality of the magmatism of the eastern Parnaiba Basin, NE Brazil (2018)

Heilbron, M., Guedes, E., Mane, M., Valeriano, C. d. M., Tupinamba, M., Almeida, J., Silva, L. G. d. E., Duarte, B. P., Favera, J. C. D., Viana, A.

Geological Society (of London)

In: Special Publications / Geological Society London

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Publication Date: 2018-06-07

Description: This paper presents new field, petrographic, geophysical, geochemical and geochronological data for the felsic and mafic magmatism of the eastern Parnaíba Basin, integrating previously published data with new surface data acquired within the scope of the Cooperation Program developed by UERJ-Petrobras. New precise 40 Ar– 39 Ar Cambrian ages ( c. 508–506 Ma) were obtained for the felsic volcanic to subvolcanic rocks associated with intracontinental rift sediments in the São Raimundo Nonato area in the SE of the basin. The new results include the detection of three different basic magmatic pulses at c. 181, 126 and 118 Ma, related, respectively, to Central Atlantic Magmatic Province magmatism, the Sardinha large igneous province and the break-up period for the equatorial basins. The eastern side of the basin contrasts with the western side and shows a predominance of outcropping sills of Sardinha age. Most of these rocks are quartz tholeiites, but two samples ( c. 118 Ma) are olivine tholeiites. This paper provides the first description of a clear chemical provinciality of the Sardinha tholeiitic magmatism in the eastern Parnaíba Basin, similar to that described in the Paraná Basin. Low-TiO 2 suites, independent of age, occur on the northwestern side of the Senador Pompéu–Coccoci lineament, whereas high-TiO 2 suites, including the Ceará Mirim dyke swarm in the basement to the east, are located SE of this lineament. The duality of geochemical signatures reproduces the basement signatures of the opposite sides of the Senador Pompéu suture zone, suggesting, at least in part, that the composition of the sub-lithospheric continental mantle of these two domains played a part in the development of Cretaceous magmatism in the Parnaíba Basin. Supplementary material: Geophysical and geochemical data provided by Petrobras and subsequent analysis. Supplementary material available online at https://doi.org/10.6084/m9.figshare.c.4117985

Print ISSN: 0305-8719

Electronic ISSN: 2041-4927

Topics: Geosciences

Published by Geological Society (of London)

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Does Acacia dealbata express shade tolerance in Mediterranean forest ecosystems of South America? (2015)

Narciso Aguilera, Carolina Sanhueza, Lubia M. Guedes, José Becerra, Sebastián Carrasco, Víctor Hernández

Wiley

In: Ecology and Evolution

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Publication Date: 2015-07-23

Description: The distribution of Acacia dealbata Link (Fabaceae) in its non-native range is associated with disturbed areas. However, the possibility that it can penetrate the native forest during the invasion process cannot be ruled out. This statement is supported by the fact that this species has been experimentally established successfully under the canopy of native forest. Nonetheless, it is unknown whether A. dealbata can express shade tolerance traits to help increase its invasive potential. We investigated the shade tolerance of A. dealbata under the canopy of two native forests and one non-native for three consecutive years, as well as its early growth and photosynthetic performance at low light intensities (9, 30, and 70 μ mol m −2 sec −1 ) under controlled conditions. We found many A. dealbata plants surviving and growing under the canopy of native and non-native forests. The number of plants of this invasive species remained almost constant under the canopy of native forests during the years of study. However, the largest number of A. dealbata plants was found under the canopy of non-native forest. In every case, the distribution pattern varied with a highest density of plants in forest edges decreasing progressively toward the inside. Germination and early growth of A. dealbata were slow but successful at three low light intensities tested under controlled conditions. For all tested light regimes, we observed that in this species, most of the energy was dissipated by photochemical processes, in accordance with the high photosynthetic rates that this plant showed, despite the really low light intensities under which it was grown. Our study reveals that A. dealbata expressed shade tolerance traits under the canopy of native and non-native forests. This behavior is supported by the efficient photosynthetic performance that A. dealbata showed at low light intensities. Therefore, these results suggest that Mediterranean forest ecosystems of South America can become progressively invaded by A. dealbata and provide a basis for estimating the possible impacts that this invasive species can cause in these ecosystems in a timescale. We investigated the shade tolerance of the invasive A. dealbata under the canopy of two native forests and one non-native for three consecutive years. Our study reveals that this species expressed apparent shade tolerance. This behavior is supported by the efficient photosynthetic that A. dealbata showed at low light intensities.

Electronic ISSN: 2045-7758

Topics: Biology

Published by Wiley

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