21,343 research outputs found
Prestonia succo J. F. Morales 2011, sp. nov.
No full textPrestonia succo J.F.Morales, sp. nov. (Fig.1) A Prestonia quinquangularis, cui similis, foliis 1.5–5.3 ×(0.5–) 0.8–1.6 cm (vs. 6.5–12.5(–20.0) × 2.0–5.5(–10.5) cm), corollae tubo 7.5–8.5 mm longis (vs. 14–20 mm) et coronae appendicibus absenstis differt. Type: — PERU. Cusco: La Convencion, Santa Teresa, Yantile, 16 March 2004, Huamantupa, Ninanzuro & Huamantupa 4079 (holotype INB!, isotypes AMAZ, CUZ, MO!, MOL, USM!). Suffrutescent liana. Stem inconspicuously puberulent when young, glabrous to glabrate at maturity, with clear sap, intrapetiolar colleters inconspicuous, up to 1 mm long. Leaves: petiole 2.0– 5.5 mm long; leaf blade 1.5– 5.3 × (0.5–) 0.8–1.6 cm, narrowly ovate to narrowly elliptic, the apex shortly acuminate, the base obtuse to rounded, membranaceous, not revolute, glabrous, secondary veins impressed beneath, inconspicuous adaxially, tertary veins not impressed. Inflorescence cymose, axillary, few-flowered, the pedicels and calyx minutely puberulent, the rachis and peduncle inconspicuously puberulent to glabrate; peduncle 2.5–3.6 cm long, pedicels 10–12 mm long, floral bracts 0.7–1.1 × 0.2–0.4 mm, linear, scarious and inconspicuous. Calyx green; sepals 2.9–3.2 × 1.1–1.3 mm, narrowly ovate, acuminate, inconspicuously puberulent, the colleter laciniate at the apex. Corolla salverform, bright yellow, minutely and inconspicuously puberulent outside, tube 7.5–8.5 × 2.3–3.2 mm, free corona lobes reduced to callous ridges, annular corona slightly 5–lobed, inconspicuous, corolla lobes 5–6 × 4–5 mm, obliquely obovate. Stamens inserted near the corolla mouth, anthers 3.1–3.3 mm long, dorsally glabrous, included or the apices barely exserted. Ovary 1.1–1.3 mm long, glabrous, style head ca. 1 mm long. Nectary irregularly 5–lobed, 1.1–1.3 mm long. Follicles not seen. Habitat: — Mountainous forest and secondary dry forest at 1800–3250 m. Distribution: — This species occurs in Peru, where it is endemic to the Department of Cusco. Etymology: — The specific epithet is an anagram of Cusco, where many Apocynaceae have been collected in the last few years. Observations:— Prestonia succo is probably related to the widespread P. quinquangularis (Jacq.) Sprengel (1825: 637), but differs in having smaller leaf blades [1.5–5.3 × (0.5–) 0.8–1.6 cm, vs. 6.5–12.5(– 20.0) × 2.0–5.5(–10.5) cm] and corollas without free corona lobes within, with the tube 7.5–8.5 mm long (vs. 14.0–20.0 mm). Paratype:— PERU. Cusco: La Convención, Santa Teresa, Choquequira, San Ignacio, Suclli et al. 2176 (INB, MO). In his treatment of the American genera of Echitoideae, Woodson (1936) reported 9 species for Peru [P. acutifolia (Benth. ex Müll.Arg.) Schumann (Engler & Prantl 1895: 188), P. mollis Kunth (Humboldt, Bonpland & Kunth 1818: 221), P. phenax Woodson (1936: 314), P. trifida (Poepp.) Woodson in Gleason & Smith (1933: 392), P. vana Woodson (1936: 323), P. lacerata Woodson (1936: 342), P. tomentosa Brown (1810: 70), P. cordifolia Woodson (1936: 352), and P. riedelii (Müll.Arg.) Markgraf (1924: 26)], whereas Zarucchi (1993) reported three additional species [P. macroneura Woodson (1936: 321), P. plumierifolia Markgraf (1930: 1038) and P. robusta Rusby (1920: 91)]. Some of these taxa were reduced to synonymy (e.g., Gentry 2001, Morales 2010), and a new species was described recently (e.g., Morales 2007). In total, 20 species of Prestonia are currently reported for Peru, two of them endemic (P. racemosa Morales [2007: 153], P. succo [described here]). Prestonia macroneura Woodson (endemic to Brazil) was reported based on Wallnöfer 11–41188 (W, WAG, Z). However, this collection is P. rotundifolia K.Schum. ex Woodson (1936: 318). The status of Prestonia lacerata is unknown, since the type in Berlin was destroyed, and no duplicates are known. Finally, P. cordifolia should be treated as a synonym of the polymorphic P. mollis. A key to the species recognized for Peru is given here.Published as part of Morales, J. Francisco, 2011, Studies in the Neotropical Apocynaceae XLI: A new species of Prestonia (Apocynoideae, Echiteae) from Peru and a key to the Peruvian species, pp. 28-32 in Phytotaxa 29 on pages 28-30, DOI: 10.11646/phytotaxa.29.1.2, http://zenodo.org/record/489437
Exposición formulada por el Excelentísimo Señor Ministro de Relaciones Exteriores de Venezuela, en la Segunda Reunión del Consejo de Ministros (Segunda Sesión Plenaria)
No full textIsidro Morales Paul, ALADI. Consejo de Ministros
The politics and economics of regulatory impact assessment
No full textThis is the author accepted manuscript. The final version is available from the publisher via the link in this record
Werauhia talamancana Cascante & J. F. Morales 2021, sp. nov.
No full text<i>Werauhia talamancana</i> Cascante & J. F. Morales, <i>sp. nov.</i> (Fig. 1). <p> <b>Diagnosis:</b> — <i>Werauhia talamancana</i> is morphologically similar to <i>W. brunei</i> in its simple spicate inflorescence with smooth and lustrous floral bracts that are distichous (not secund) at anthesis. The new species differs from <i>W. brunei</i> in having larger flowers with longer petals (5.3–6.0 <i>vs.</i> 4.0– 4.5 cm) and longer stamens (4.0–5.0 <i>vs.</i> 3.6–3.7 cm). The lower peduncle bracts in <i>W. talamancana</i> are foliose and longer, compared to the non-foliose and shorter peduncle bracts of <i>W. brunei</i>. Also, the floral bracts of the new species are usually brown-maroon at anthesis as opposed to light green in <i>W. brunei</i>.</p> <p> <b>Type:—</b> COSTA RICA. San José: Jardín, Dota. Cordillera de Talamanca, sector del Cerro de la Muerte, carretera interamericana sur. Área no protegida. Fragmento de bosque a aprox. 0.5 Km S de intersección de El Empalme. Bosque muy húmedo montano bajo. 9°42’47.8” N, 83°56’58.3” W, 2380 m; 12 February 2021 (fl.), <i>Cascante-Marín 2935</i> (Holotype: USJ!, Isotype: CR!).</p> <p> <i>Plants</i> epiphytic, acaulescent, solitary (forming a single rosette), (40-) 50–65 cm in diameter, 30–35 cm tall. <i>Leaves</i> rosulate, (13-) 17–24 per rosette, forming a water compounding tank; <i>sheath</i> elliptic, 9–15 cm long, 5.5–7.5 cm wide, adaxially whitish-cream, sometimes tinged with magenta, with a dark-brown horizontal band at the base abaxially, lepidote on both surfaces; <i>blade</i> ligulate, recurved, with attenuate apex, (31–) 37–55 cm long, 3.5–4.3 cm wide, inconspicuously punctulate-lepidote on both sides, concolorous green. <i>Inflorescence</i> terminal, simple; <i>peduncle</i> curved to nearly horizontal, 25–33 cm long, 8–9 mm in diameter, hidden by its bracts; <i>peduncle bracts</i> foliose, imbricate, decreasing in size toward the apex, green, the upper ones tinged with brown-maroon, punctulate-lepidote; its sheath 4.5–5.5 cm long (lower ones), 3.5–4.0 cm long (upper ones); its blade narrowly triangular-attenuate, 15–30 cm long (lower ones), 5–8.5 cm long (upper ones). <i>Spike</i> narrowly sub-oblong at anthesis, flattened, erecto-patent to nearly horizontal, 13–18 cm long, 4–4.7 cm wide, 7–9 flowered, rachis hidden by the bracts; <i>floral bracts</i> ovate, 5.5–6 cm long, 3.2–4.4 cm wide (when extended and flattened), 3–4 times longer than the internodes, lustrous, slightly nerved (when dry), sparsely punctulate-lepidote, ecarinate, strongly imbricate, not secund with the flowers at anthesis, thin coriaceous, tinged with or completely brown-maroon on the upper side, light-green on the lower side, but turning green on both sides when fruiting. <i>Flowers</i> slightly zygomorphic, nocturnal, downward secund at anthesis; <i>pedicel</i> stout, white, ca. 9 mm long, ca. 8 mm in diameter; <i>sepals</i> free, ovate, chartaceous, cymbiform, 3.4–3.7 cm long, 1.6–1.9 cm wide when flattened, ecarinate, whitish-green, lustrous, glabrous; <i>petals</i> free, narrowly obovate, white, 5.3–6.2 cm long, 2–2.4 cm wide when extended and flattened, bearing two appendages at the base; appendages subspatulate, 11–13 mm long, ca. 3 mm wide, basally adnate to the petal, apex dactyloid-dentate; <i>stamens</i> subequal, shorter than the petals; <i>filaments</i> free, linear, flat, 3.6–4.2 cm long, white; <i>anthers</i> dorsifixed near the base, yellow, oblong, 8-9 mm long, arranged at the upper part of the corolla at anthesis; <i>ovary</i> superior, conical, white, ca. 10 mm long, <i>style</i> white, 3–3.5 cm long; <i>stigma</i> 3-lobed, cupulate, ca. 3 mm in diameter, equaling the anthers. <i>Capsule</i> ellipsoid, blackish, lustrous, 3.8–4.2 cm long, ca. 1.2 cm in diameter, apiculate. <i>Seeds</i> with a plumose white appendage, not measured.</p> <p> <b>Additional specimens examined</b> <b>(paratypes):</b> — COSTA RICA. Type locality. 15 February 2017 (fl.), <i>Cascante-Marín et al. 2652</i> (USJ); –, 31 January 2018 (fl.), <i>Cascante-Marín & Trejos 2735</i> (USJ); –, 11 May 2018 (fl.), <i>Cascante-Marín & Trejos 2769</i> (USJ); –, 13 Setember 2018 (fr.), <i>Cascante-Marín & Trejos 2800</i> (USJ); Limón, Talamanca. P. N. Cordillera de Talamanca, flanco NE y cumbre Cerro Biricuacua, entre Ujarrás y San José Cabécar. 9°23’55” N, 83°10’10” W, 2600 m; 6April 1993 (fl.), <i>Herrera & Gamboa 6218</i> (CR). PANAMÁ. Chiriquí: cerro Punta, falda NO, camino desde Finca Drácula hacia el último lodge dentro del Parque, 10 August 2006 (fl), <i>Morales & Santamaría 14625</i> (CR).</p> <p> <b>Distribution and habitat:</b> —Highlands of the Talamanca mountain range in Costa Rica and Panama,between 2380 and 2600 m asl elevation. At the type locality, plants of this new epiphytic bromeliad are growing in the lower canopy of mixed oak forests in a very humid environment. The vegetation is classified as Very Humid Lower Montane Forest according to Holdridge’s Life Zones System (Bolaños & Watson 1993). Other species in the bromeliad community were the sympatric <i>W. ampla</i> (Smith 1963: 497) Grant (1995a: 30), <i>W. ororiensis</i> (Mez 1896: 9) Grant (1995a: 44), <i>W. pittieri</i> (Mez 1903: 135) Grant (1995a: 33), <i>W. rubra</i> (Mez & Wercklé 1904: 878) Grant (1995a: 47), and <i>W. williamsii</i> (Smith 1958: 193) Grant (1995a: 49).</p> <p> <b>Phenology and ecology:</b> —Flowering from February to May; fruiting from February to December. Anthesis is nocturnal and regularly a single flower opens each night, senescence occurs in the morning of the following day. Floral morphology traits (e.g., white petals and campanulate corolla; Fig. 2D) and anthesis time suggest a nocturnal pollinator, probably bats, following the chiropterophillous pollination syndrome described by Faegri and van der Pijl (1979) and related reports in some congeners (Aguilar-Rodríguez <i>et al.</i> 2019).</p> <p> <b>Etymology:</b> —The epithet refers to the mountains of the Talamanca mountain range in southern Central America, the center of diversity of <i>Werauhia</i> and where nearly two-thirds of thespecies occurs.</p> <p> <b>Comments:—</b> This new species resembles <i>W. brunei</i> (Mez & Wercklé 1904: 865) Grant (1995a: 31) in the smooth and lustrous floral bracts that are distichous at anthesis (Fig. 2C). Also, <i>W. brunei</i> inhabits montane forests within the same elevation range as <i>W. talamancana,</i> but this new species differs by its longer petals (5.3–6.0 <i>vs</i>.4.0– 4.5 cm) and stamens (4.0–5.0 <i>vs</i>. 3.6–3.7 cm) (Fig. 2D). The brown-maroon color of the floral bracts in <i>W. talamancana</i> is a distinctive trait that distinguishes it from <i>W. brunei</i> (Fig. 2C).This qualitative characteristic is atypical among singlespicate species of <i>Werauhia,</i> which duringanthesis usually exhibit floral bracts with green tones and sometimes with brownish bract tips due to drying.</p> <p> <i>Werauhia talamancana</i> falls into Grant’s (1995a) section <i>Werauhia</i>,which includes plants with simple inflorescence. Following the taxonomic key provided by Morales (2003a), the new species belongs to a species group that exhibits relatively large floral bracts (3.0– 6.3 cm) with smooth and lustrous or rugose surfaces. This species group includes among others <i>W. ampla</i>, <i>W. bicolor</i> (Smith 1960: 174) Grant (1995a: 30), <i>W. burgeri</i> (Smith 1974: 326) Grant (1995b: 121), <i>W. gladioliflora</i> (Wendland 1863: 31) Grant (1995a: 31), <i>W. macrantha</i> (Mez & Wercklé 1904: 867) Grant (1995b: 121), <i>W. macrochlamys</i> (Mez & Wercklé 1904: 865) Morales (2003b: 65), <i>W. osaensis</i> (Morales 1999: 403) Morales (2003c: 15), <i>W. tiquirensis</i> (Morales 1999: 405) Morales (2003c: 110), and <i>W. tonduziana</i> (Smith 1938: 166) Grant (1995a: 35), that are very similar in appearance and difficult to keep apart from another (Morales 1999, 2003a). Molecular and floral morphology studies are necessary to elucidate the relationships between these taxa.</p>Published as part of <i>Cascante-Marín, Alfredo & Morales, J. Francisco, 2021, A new species of Werauhia (Bromeliaceae, Tillandsioideae) from the highlands of southern Central America, pp. 254-258 in Phytotaxa 523 (3)</i> on pages 255-257, DOI: 10.11646/phytotaxa.523.3.6, <a href="http://zenodo.org/record/5591458">http://zenodo.org/record/5591458</a>
FIGURES –5. Shape of branches in several Ramalina species. 1. Subterete shape (R. lopezii), scale = 1.5 mm. 2. Flattened shape (R. andina), scale = 0.7 mm. 3. Terete and knotty shape (R. santanensis), scale = 1 cm. 4. Canaliculate shape in R. cochlearis (scale = 3.2 cm) and (5) in R.subfraxinea var. confirmata (scale = 1 cm). in The genus Ramalina Acharius (Ascomycota, Lecanoromycetes, Ramalinaceae) in northern South America
No full textFIGURES –5. Shape of branches in several Ramalina species. 1. Subterete shape (R. lopezii), scale = 1.5 mm. 2. Flattened shape (R. andina), scale = 0.7 mm. 3. Terete and knotty shape (R. santanensis), scale = 1 cm. 4. Canaliculate shape in R. cochlearis (scale = 3.2 cm) and (5) in R.subfraxinea var. confirmata (scale = 1 cm).Published as part of Marcano, Vicente, Méndez, Antonio Morales & Prü, Ernesto Palacios, 2021, The genus Ramalina Acharius (Ascomycota, Lecanoromycetes, Ramalinaceae) in northern South America, pp. 1-77 in Phytotaxa 504 (1) on page 7, DOI: 10.11646/phytotaxa.504.1.1, http://zenodo.org/record/542519
Guanidine-Catalyzed Reductive Amination of Carbon Dioxide with Silanes: Switching between Pathways and Suppressing Catalyst Deactivation
No full textA mechanistic investigation into the guanidine-catalyzed reductive amination of CO₂, using a combination of ¹H, ²⁹Si NMR, FT-IR, MS, and GC profiling, is reported. Inexpensive and readily available N,N,N′,N′-tetramethylguanidine (TMG) was found to be an equally effective catalyst compared to more elaborate cyclic guanidines. Different catalytic pathways to formamide 2, aminal 4, and N-methylamine 3 were identified. A pathway to formamide product 2 dominates at 23 °C. Increasing the reaction temperature to 60 °C enables a competitive, higher-energy pathway to 4 and 3, which requires direct reduction of CO₂ with PhSiH₃ to formoxysilane E. Reduction of aminal 4, in the presence of CO₂ and the catalyst, led to formation of a 1:1 ratio of 2 and 3. The catalyst itself can be formylated under the reaction conditions, resulting in its deactivation. Thus, alkylated TMGs were found to be more stable and more active catalysts than TMG, leading to a successful organocatalyzed reductive functionalization of CO₂ with silane at 0.1 mol % catalyst loading (TON = 805 and TOF = 33.5 h‾¹)
Phase Distribution Efficiency of cm-Scale Ultrasonically Powered Receivers
No full textIn the domain of ultrasonically powered biomedical implants, there is an increasing interest in cm-scale ultrasonic receivers (RX). However, when a single-element transducer is used as the RX transducer, an uneven phase distribution across the RX area can significantly reduce the harvestable power. In this paper, we investigate the impact of lateral and angular misalignment on the acoustic field phase distribution across the RX surface. We show that, for a single-element RX transducer, lateral misalignment has minimal effect on the harvestable power, whereas even small angular misalignments can cause a considerable reduction, especially for larger RX sizes. We present a potential solution that consists of subdividing a large RX transducer (e.g. 20 × 20mm2) into smaller elements, which significantly improves power transfer efficiency by taking advantage of the smaller phase variation across the surface of each element. The trade-offs between achieving a minimum acceptable power transfer efficiency and managing the increased complexity in packaging and matching circuitry are also discussed.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic Components, Technology and MaterialsBio-Electronic
Delirio agudo y enfermedades en que se presenta : Tesis
No full textFil: Morales, Nicasio. Universidad de Buenos Aires. Facultad de Medicina. Buenos Aires, Argentina.A la cabeza de portada: Facultad de Ciencias Médicas. Incluye nómina de Catedráticos y Asignaturas. Tesis con dedicatorias. 34 p. ; 23 cm
Highly efficient laser-driven Compton gamma-ray source
No full textThe recent advancement of high-intensity lasers has made all-optical Compton scattering become a promising way to produce ultrashort brilliant gamma-rays in an ultra-compact system. However, so far achieved Compton gamma-ray sources are limited by low conversion efficiency and spectral intensity. Here we present a highly efficient gamma photon emitter obtained by irradiating a high-intensity laser pulse on a miniature plasma device consisting of a plasma lens and a plasma mirror. This concept exploits strong spatiotemporal laser-shaping process and high-charge electron acceleration process in the plasma lens, as well as an efficient nonlinear Compton scattering process enabled by the plasma mirror. Our full three-dimensional particle-in-cell simulations demonstrate that in this novel scheme, brilliant gamma-rays with very high conversion efficiency (higher than 10(-2)) and spectral intensity (similar to 10(9) photons/0.1%BW) can be achieved by employing currently available petawatt-class lasers with intensity of 10(21) W cm(-2). Such efficient and intense gamma-ray sources would find applications in wide-ranging areas. ©2019 The Author(s)
- …
