19,511 research outputs found
New lamellar phase with pores in the chain-melting regime of an anionic phospholipid dispersion
No full textThe anionic phospholipid DMPG (dimyristoyl phosphatidylglycerol) may exhibit in water, instead of a unique melting transition of the hydrocarbon chains, a "melting regime" for pH values above 5, where the phosphate groups are deprotonated, and for low ionic strength, where charge screening is weak. The chain-melting process of DMPG starts at Tmon (onset of the melting regime at ∼ 20°C), but the complete fluid phase exists only above Tmoff (offset of the melting regime at ∼ 30°C). In a recent paper we developed a SAXS model for a bilayer with pores to explain SAXS results obtained for concentrations up to 70 mM DMPG (F. Spinozzi, L. Paccamiccio, P. Mariani, and L. Q. Amaral, Langmuir, in print, 2010). A new lamellar phase with pores, starting 3°C above T mon and existing up to 4°C above Tm off, was also identified at the higher investigated DMPG concentrations (up to 300 mM DMPG). In this paper we focus in more detail the SAXS curves obtained in the concentration interval 70-300 mM DMPG. The slope of the scattering profile in the very small q range, as well as the anomalous increase in the intensity of the bilayer band centered around 0.12 Å-1 after Tmoff, have been in particular analyzed. By using a model of water-penetrated bilayers, the volume fractions of DMPG and water molecules inside the bilayer was derived as a function of temperature
Corethrella (Corethrella) borkenti Amaral & Pinho 2015
No full textCorethrella (Corethrella) borkenti Amaral & Pinho, 2015 Fig. 41; Appendix 1 Diagnosis Larva Only bromeliculous species with the following combination of characters: head mostly pale, but mandible, maxilla, segment X, and siphon more darkly pigmented (Amaral & Pinho 2015: fig. 19); postmentum elongate, with margins almost parallel up to basal 0.6, strongly tapering distally (Fig. 41D); prementum with 12–14 darkly pigmented teeth (Fig. 41D); central tooth large, second small, third large and remaining ones gradually decreasing in size (Fig. 41D); seta 15-C bifurcated or forked. Pupa Only bromeliculous species with the following combination of characters: exuvia medium brown (Amaral & Pinho 2015: fig. 16), abdomen elongate and tapering, darker mesially; abdominal segments little expanded laterally, with one dorsal and one lateral well-developed setae (Amaral & Pinho 2015: fig. 18) on each of segments II–VII (these setae longer than respective segments, largest ones about twice as long); dorsal setae progressively shorter from V–VII; all setae darkly pigmented; respiratory organ tubular, very elongate, expanded at apex (Amaral & Pinho 2015: fig. 17). Material examined BRAZIL – Bahia State • 1 ♂, adult; Ilhéus, UESC Max de Menezes; 14°47ʹ54ʺ S, 39°10ʹ24ʺ W; 21 May 2019; A.P. Amaral leg.; Mirco’s bromeliad; CE-MHS • 1 ♀, adult, with larval and pupal exuviae; Ilhéus, Cabruca da UESC; 14°47ʹ48ʺ S, 39°10ʹ20ʺ W; 35 m a.s.l.; 16 May 2019; A.P. Amaral leg.; bromeliad; CE-MHS • 1 ♀, adult, with larval and pupal exuviae; Porto Seguro, RPPN Estação Veracel, Trilha 12-09; 16°19ʹ38ʺ S, 39°07ʹ22ʺ W; 73 m a.s.l.; 28 Aug. 2019; A.P. Amaral leg.; bromeliad; CE-MHS. – Santa Catarina State • 1 ♀, adult; Grão Pará, Parque Estadual Serra Furada, CAPEA stream; 28°11ʹ26ʺ S, 49°23ʹ30ʺ W; 16 Nov. 2012 – 7 Jan. 2013; L.C. Pinho, M.C. Novaes and M.F. Haddad leg.; Malaise trap; CE-MHS • 1 ♀, adult, with larval and pupal exuviae; Florianópolis, Pantanal, Rua Sulcar; 27°36ʹ35ʺ S, 48°30ʹ57ʺ W; 53 m a.s.l.; 21 Jul. 2016; A.P. Amaral leg.; bromeliad; CE-MHS. Description Male and female adults (1 ♂, 4 ♀♀) HEAD. Sensilla (Fig. 41A): Ocular row with 1 thick offset seta at ventral part and 1 more dorsally, followed by 13–15 setae shortly extending posteriorly. Subocular row well-defined with about 20 slender setae from interocular space to posterior portion. Vertex with a few scattered setae. Postgenal row with 6–15 slender setae, ranging from mid-posterior portion of head to ventromedially. With 2 thick ventromedial setae. THORAX. Sensilla (Fig. 41B): Antepronotum with 1–2 dorsal and 3–7 anteroventral intermediate setae. Postpronotum with 1 thick dorsal, 1 slender anterodorsal, and 4–5 more ventrally located setae. Scutum, prescutal area with 2 thick and 2–4 intermediate setae, dorsoventrally aligned near prescutal suture; 0–7 intermediate/slender anterior setae. Antealar area with cluster of about 5–7 thick, 4–8 intermediate, and 6–9 slender setae located ventrally; 11–25 slender dorsal setae. Supraalar area with 3–4 thick and 0–1 intermediate setae aligned longitudinally, about 6–9 slender setae surrounding. Dorsocentral row, posterior part with cluster of 4–6 thick and about 3–7 slender setae; approximately 17–23 thick/ intermediate and 38–41 slender filling row. Scutellum with 12–14 thick setae. Posterior anepisternum bare. Anepimeron with 5–17 slender setae. WING. Male R 3 /R 1: 0.40; R 2+3 /R 2: 0.94. Female R 3 /R 1: 0.51 (0.47–0.55); R 2+3 /R 2: 0.66 (0.59–0.73). LEGS. Empodium (Fig. 41C) of intermediate length and thickness, with 5 branches. Male Ta1/Ta2: 3.00; Ta3/Ta4: 1.60. Female Ta1/Ta2: 2.90 (2.71–3.00); Ta3/Ta4: 1.09 (1.08–1.13). Larva (n = 3) EXUVIA (Amaral & Pinho 2015: fig. 19). Head mostly pale; mandible, maxilla, segment X, and siphon more darkly pigmented; without tergal plates. HEAD (Fig. 41D). Wide, somewhat round in dorsoventral view, 1.22 (1.19–1.25) times as wide as long. Antenna 0.41 (0.40–0.41) times length of head; antennal groove 1.36 (1.25–1.48) times length of antenna. Ventral margin of antennal groove serrate. Postmentum elongate, with margins almost parallel until basal 0.6, strongly tapering distally; 1.13 (1.11–1.14) times as wide as long; length 0.58 (0.57–0.59) of head. Prementum (Amaral & Pinho 2015: figs 21–22) curved, with 12–14 darkly pigmented teeth; central tooth largest, second tooth small, third large, remaining ones gradually smaller.Anteroventral projection of gena strongly projected anteriorly, surface smooth. Postcoila extending to lateral margin of gena. Subgenal carina without spinules. Crown with 13–17 regularly distributed spines, sizes growing towards lateral, ventral spines shortest; largest spine 0.08 mm (0.07–0.09) long. Seta 16-C anterolateral to crown. Mandible, apical tooth 1.62 (1.43–1.83) times length of first dorsal tooth; seta 3-Mn 0.43 (0.42–0.43) times length of 4-Mn; lacinia mobilis with 8 blades; mandibular lobe well-developed, pale, contiguous to teeth. Sensilla: 9-C short, fan-like; 10-C elongate, simple; 11-C elongate, simple or forked; 12-C elongate, simple; 13-C short, fan-like; 14-C moderately elongate, simple; 15-C moderately elongate, bifurcated or forked; 16-C elongate, bifurcated. 0a-Mn short, fan-like; 0b-Mn elongate, simple. 6-Mx short, bifurcated; 4-Mx moderately elongate, simple; 5-Mx short, fan-like. SIPHON (Amaral & Pinho 2015: fig. 28). 0.32 mm (0.30–0.34) long. Seta 1 forked, situated at 0.19 (0.11–0.26) of length from base; 6-S pale, 9-S darkly pigmented; length of 6-S/9-S: 0.54 (0.48–0.60). Pupa (n = 3) EXUVIA (Amaral & Pinho 2015: fig. 16). Medium brown, with abdominal segments II–VII darker mesially; setae darkly pigmented, except cephalothorax dorsal 1, setae on terminal process lightly pigmented. CEPHALOTHORAX. Length 1.32 mm (1.17–1.61). Dorsal seta 1 pale, short, moderately thick; about one length apart from dorsal 2; dorsal 2 darkly pigmented, of same basal thickness, about four times as long; both setae arising from undifferentiated cuticle. Metathoracic 2 and supraalar 2 sensilla present. Metathoracic seta 1 short, simple. ABDOMEN (Amaral & Pinho 2015: fig. 18). Elongate, tapering from IV–VII, dorsal tegument smooth; length of segments I–VIII: 1.37 mm (1.17–1.73), width/length: 0.54 (0.49–0.58). Margins serrate, moderately expanded laterally, somewhat posteriorly from VI–VIII. Largest seta L-2-II, 1.79 (1.68– 1.94) times length of segment. Terminal process moderately elongate, basal width 0.70 (0.67–0.72) of length, with paddles moderately tapering from base; D-1-IX short, at about 0.50 from base; apical spine articulated; ventroapical seta V-1-IX about 3 times as long as apical spine; female genital lobe tapered at midlength, distinctly narrower than base of paddles; genital lobe elongate in male, slightly tapering, extending to half length of paddles. Chaetotaxy as illustrated. Distribution and biology Examined individuals with their associated exuviae were collected as larvae from bromeliads in the Atlantic forest of Santa Catarina and Bahia states. Adults were collected with light traps (Amaral et al. 2019). This species has been recorded at altitudes ranging from 35 to 248 m a.s.l. Remarks In the original description, Amaral & Pinho (2015) recognized as a diagnostic feature of the species the exceptionally elongate pupal respiratory organ, with a length 13–18 times its basal width. The specimens examined here show a less elongated respiratory organ, with a length/width ratio ranging from 9.5 to 13. The other diagnostic features of immatures and adults, however, made it possible to confidently identify the specimens. Moreover, in the original description, the long lateral seta on the abdomen of the pupa is indicated as L-4, but we here reinterpret it as an L-2 seta. One of the specimens seems to have trifid branches on the empodium, although the position of the legs on the microscope slide make it difficult to confirm this.Published as part of Amaral, André P., Mariano, Rodolfo & Pinho, Luiz Carlos, 2023, Description of five new species of frog-biting midges (Diptera, Corethrellidae) from Brazil and examination of new morphological characters with utility for taxonomic and phylogenetic studies, pp. 1-120 in European Journal of Taxonomy 874 (1) on pages 82-85, DOI: 10.5852/ejt.2023.874.2135, http://zenodo.org/record/803774
Posición taxonómica de Iberis Sampaiana Amaral Franco & Pinto da Silva
No full textSe analizan las afinidades entre I. crenata Lam. e l. sampaiana Amaral Franco & Pinto da Silva.The relations between I. crenata Lam. and I. sampaiana Amaral Franco & Pinto da Silva are studied
Scyphoproctus telesphorei Da Silva & Amaral 2019
No full textScyphoproctus telesphorei n. nov. (“nomen novum”) Material examined. Heteromastides platyproctus Pillai, 1961, holotype BMNH 1960.3.13.22—(8°31'12'' N, 81°9'36'' E): 2–7m deep, coll. 1959, Tambalagam Lake, Sri Lanka, Indian Ocean, 1 spec. Remarks. According to the International Code of Zoological Nomenclature (1999), identical species-group names established for different nominal taxa and subsequently brought together in combination with the same generic name are secondary homonyms and the junior is invalid. The junior homonym must be rejected and replaced either by an available and potentially valid synonym or, for lack of such a name, by a new substitute name (“ nomen novum ” or “ new replacement name ”), with its own author and date (Art. 60.3). So, after we relocated the genus Heteromastides in Scyphoproctus, we had to rename Heteromastides platyproctus Pillai, 1961 because it was a junior homonym. We chose Scyphoproctus telesphorei after the previous species author, Telesphore Gottfried Pillai. The original description is very good, except the author did not notice the achaetous segment of the specimen; by the way, the author described the anal plaque, but put this species into another genus. Scyphoproctus telesphorei n. nov. belongs to a group of species with the set of acicular spines positioned marginally on the plaque, either protruding from the edge or embedded. The species presents a rounded prostomium without palpode; eyespot as a pair of elliptical-shaped areas on each side; complete inter-segmental groove between peristomium and achaetous segment; thorax with 13 segments, including peristomium, one additional achaetous segment and 11 chaetigers; one pre-pygidial segments with neuropodial hooks and notopodial spines; a well-developed anal plaque formed by the fusion of 10 chaetigers with 10 sets of acicular spines positioned marginally on the plaque, protruding from the edge, and two short anal cirri.Published as part of Silva, Camila Fernanda Da & Amaral, Antonia Cecilia Zacagnini, 2019, Scyphoproctus Gravier, 1904 (Annelida, Capitellidae): description of three new species and relocation of Heteromastides Augener, 1914 in Scyphoproctus, pp. 95-120 in Zootaxa 4560 (1) on page 118, DOI: 10.11646/zootaxa.4560.1.5, http://zenodo.org/record/262739
Crassostrea mangle Amaral & Simone 2014
No full text<p> <b> <i>mangle, Crassostrea</i> Amaral & Simone, 2014</b> </p> <p> <i>Crassostrea mangle</i> Amaral & Simone, 2014: 2–6 (figs 1–2).</p> <p>Bivalvia, Ostreidae</p> <p> <i>Holotype</i>: MZSP 89462.</p> <p> <i>Paratypes</i> 1 <i>(40 spc)</i>: MZSP 100495.</p> <p> <i>Locality</i>: Brazil, Alagoas State, Barra de Camaragibe, Camaragibe River Estuary (type locality), 21 Oct. 2008; 1) 8 Jan. 2011.</p> <p> <i>Collector</i>: M.D.S. Tavares.</p> <p> <i>Preservation</i>: 70% ethanol.</p>Published as part of <i>Cavallari, Daniel C., Dornellas, Ana Paula S. & Simone, Luiz Ricardo L., 2016, Second annotated list of type specimens of molluscs deposited in the Museu de Zoologia da Universidade de São Paulo, Brazil, pp. 1-59 in European Journal of Taxonomy 213</i> on page 35, DOI: 10.5852/ejt.2016.213, <a href="http://zenodo.org/record/3840125">http://zenodo.org/record/3840125</a>
Risk Management of Risk under the Basel Accord: Forecasting Value-at-Risk of VIX Futures
No full textThe Basel II Accord requires that banks and other Authorized Deposit-taking Institutions (ADIs) communicate their daily risk forecasts to the appropriate monetary authorities at the beginning of each trading day, using one or more risk models to measure Value-at-Risk (VaR). The risk estimates of these models are used to determine capital requirements and associated capital costs of ADIs, depending in part on the number of previous violations, whereby realised losses exceed the estimated VaR. McAleer, Jimenez-Martin and Perez-Amaral (2009) proposed a new approach to model selection for predicting VaR, consisting of combining alternative risk models, and comparing conservative and aggressive strategies for choosing between VaR models. This paper addresses the question of risk management of risk, namely VaR of VIX futures prices. We examine how different risk management strategies performed during the 2008-09 global financial crisis (GFC). We find that an aggressive strategy of choosing the Supremum of the single model forecasts is preferred to the other alternatives, and is robust during the GFC. However, this strategy implies relatively high numbers of violations and accumulated losses, though these are admissible under the Basel II Accord.Median strategy; Value-at-Risk (VaR); daily capital charges; violation penalties; optimizing strategy; aggressive risk management; conservative risk management; Basel II Accord; VIX futures; global financial crisis (GFC)
Risk Management of Risk under the Basel Accord: Forecasting Value-at-Risk of VIX Futures
No full textThe Basel II Accord requires that banks and other Authorized Deposit-taking Institutions (ADIs) communicate their daily risk forecasts to the appropriate monetary authorities at the beginning of each trading day, using one or more risk models to measure Value-at-Risk (VaR). The risk estimates of these models are used to determine capital requirements and associated capital costs of ADIs, depending in part on the number of previous violations, whereby realised losses exceed the estimated VaR. McAleer, Jimenez-Martin and Perez- Amaral (2009) proposed a new approach to model selection for predicting VaR, consisting of combining alternative risk models, and comparing conservative and aggressive strategies for choosing between VaR models. This paper addresses the question of risk management of risk, namely VaR of VIX futures prices. We examine how different risk management strategies performed during the 2008-09 global financial crisis (GFC). We find that an aggressive strategy of choosing the Supremum of the single model forecasts is preferred to the other alternatives, and is robust during the GFC. However, this strategy implies relatively high numbers of violations and accumulated losses, though these are admissible under the Basel II Accord.Median strategy, Value-at-Risk (VaR), daily capital charges, violation penalties, optimizing strategy, aggressive risk management, conservative risk management, Basel II Accord, VIX futures, global financial crisis (GFC).
Breves considerações sobre Azevedo Amaral e o Almanack Israelita
No full textAzevedo Amaral became known as one of the ideologues of the Estado Novo, a proponent of the so-called authoritarian democracy. He also advocated racist and eugenic ideas and flirted with anti-Semitism. However, in 1937, he wrote the essay “A questão judaica” in the Almanack Israelita, a publication organized by Samuel Wainer. The book aimed to show the general public the history, achievements, and integration of Jews in the world and in Brazil. The purpose of this article is to analyze the aforementioned essay by Azevedo Amaral, seeking to illuminate another facet of the author of O Estado Autoritário e a Realidade Nacional, the work for which he is best known.
Azevedo Amaral se hizo conocido como uno de los ideólogos del Estado Novo, un defensor de la llamada democracia autoritaria. También abogó por ideas racistas y eugénicas y se aproximó al antisemitismo. Sin embargo, en 1937, escribió el ensayo “A questão judaica” en el Almanack Israelita, una publicación organizada por Samuel Wainer. El libro tenía como objetivo mostrar al público en general la historia, los logros y la integración de los judíos en el mundo y en Brasil. El propósito de este artículo es analizar el ensayo mencionado de Azevedo Amaral, buscando iluminar otra faceta del autor de O Estado Autoritário e a Realidade Nacional, la obra por la cual es más conocido.
Azevedo Amaral ficou conhecido como um dos ideólogos do Estado Novo, defensor da chamada democracia autoritária. Também defendeu ideias racistas e eugênicas e flertou com o antissemitismo. Porém, em 1937, escreveu o ensaio “A questão judaica” no Almanack Israelita, publicação organizada por Samuel Wainer. O livro tinha como objetivo mostrar ao público em geral a história, as realizações e a inserção dos judeus no mundo e no Brasil. O objetivo deste artigo é analisar o ensaio de Azevedo Amaral acima referido, buscando iluminar outra faceta do autor de O Estado Autoritário e a Realidade Nacional, obra pela qual ficou mais conhecido.
 
LEVANTAMENTO de reconhecimento de baixa intensidade dos solos do município de Corumbá e Ladário: zoneamento agroecológico do estado do Mato Grosso do Sul.
No full textNilson Rendeiro Pereira; Fernando Cézar Saraiva do Amaral; Humberto Gonçalves dos Santos; Silvio Barge Bhering; Waldir de Carvalho Júnior; César da Silva Chagas; Mário Luiz Diamante Áglio; Carlos Henrique Lemos Lopes; Renata S. Rodrigues; Natália Cristina L. e Silva
“Sádico” e “necrófilo”: Narrativas médico-legais nos “crimes de Preto Amaral” (São Paulo, Brasil, 1926-1927)
No full textÀ la fin des années 1920, dans la ville de São Paulo, au Brésil, une série de crimes sexuels a été attribuée à José Augusto do Amaral, un homme noir de 55 ans. De la micro-histoire, l\u27article remonte aux meurtres de trois jeunes hommes, considérés comme typiques du sadisme et de la nécrophilie, qui ont entériné les diagnostics de dégénérescence et de criminalité naturelle. En problématisant les récits médico-légaux, l\u27affaire, publiée dans le compendium Psiquiatria Clínica e Forense, d\u27Antonio Carlos Pacheco e Silva, ainsi que ses impacts sur la presse pauliste de l\u27époque, l’article permet d\u27accéder aux dimensions ethnico-raciales qui signifiaient les hommes noirs comme dégénérés. Les résultats nous permettent de considérer que la psychiatrie médico-légale a non seulement fabriqué des masculinités noires perverses et sexuellement indisciplinées, mais leurs récits ont corroboré des significations socio-historiques racistes et discriminatoires, hier et aujourd\u27hui.No final da década de 1920, na cidade de São Paulo, Brasil, uma série de crimes sexuais foram atribuídos a José Augusto do Amaral, homem, negro, 55 anos. A partir da micro-história, o artigo remonta aos assassinatos de três jovens do sexo masculino, crimes com características próprias do sadismo e da necrofilia, que referendavam diagnósticos da degenerescência e da criminalidade nata. Ao problematizar narrativas médico-legais divulgadas no compêndio Psiquiatria Clínica e Forense, de Antonio Carlos Pacheco e Silva (1945), bem como seus impactos na imprensa paulistana à época, o artigo acessa dimensões étnico-raciais que classificaram homens negros como degenerados. Os achados permitem considerar que a psiquiatria-forense não somente fabricou masculinidades negras perversas e sexualmente desregradas, mas suas narrativas mantêm significados histórico-sociais racistas e discriminatórios, ontem e hoje
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