203,368 research outputs found
Upper Cohen-Macaulay Dimension
No full textIn this paper, we define a homological invariant for finitely generated modules over a commutative noetherian local ring, which we call upper Cohen-Macaulay dimension. This invariant is quite similar to Cohen-Macaulay dimension that has been introduced by Gerko. Also we
define a homological invariant with respect to a local homomorphism of local rings. This invariant links upper Cohen-Macaulay dimension with Gorenstein dimension.</p
Andrés M. Kramer, Chile. Historia de una experiencia socialista
No full textAraya Guillermo. Andrés M. Kramer, Chile. Historia de una experiencia socialista. In: Bulletin Hispanique, tome 77, n°1-2, 1975. pp. 249-250
Revision of the subgenus Mesopraocis Flores & Pizarro-Araya of the Neotropical genus Praocis Eschscholtz (Coleoptera, Tenebrionidae, Pimeliinae)
No full textThe second part of a revision of the species of the genus Praocis Eschscholtz is presented. The subgenus Mesopraocis Flores & Pizarro-Araya, distributed in northern Chile from 25° South to 31° South, is revised. This article includes a redescription of the subgenus, redescriptions of its species, an identification key, and a discussion on morphological adaptations of the species to fossorial life. Habitus photographs, scanning electron micrographs of head, antennae, prosternum, abdomen, and protibiae, illustrations of genital features, and distribution maps are presented. Conical pegs sensilla on tibiae are described and illustrated using SEM for the first time for a South American tenebrionid species. A new Praocis species is described: Praocis (Mesopraocis) arenicola sp. nov. Praocis (Mesopraocis) flava Kulzer, 1958 is synonymised with P. (M.) pilula Laporte, 1840. Other species of the subgenus are: P. (M.) calderana Kulzer and P. (M.) nitens Kulzer. A statement on the variation in the number of antennomeres in P. (M.) pilula is appended
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Rosewell, New Mexico, American G.I. Forum State Convention (photograph)
No full textRosewell, New Mexico, American G.I. Forum State Convention. Ruben and Pete Araya, Ladies Auxiliary and Two helpers prepared the food for 175 directors and their guests
Distribution and Conservation Status of Gyriosomus granulipennis Pizarro-Araya and Flores, 2004 (Coleoptera: Tenebrionidae)
No full text(Tenebrionidae: Nycteliini), is an apterousspecies endemic to Choros Island, which belongs to the archipelago of LosChoros in IV Regio, Chile. To analyze the data about the distribution and conservationstatus of . granulipennis, we conducteda study using pitfall in Choros Island. In this paper, weanalyze the distribution and conservation status of . granulipennis and propose actions to monitor and ensure thepreservation of the species populations. The restricted distribution of granulipennis on Choros Islandmay be considered an indicator of species rarity, a basic criterion to identify species in need of conservation. Monitoring the status and dynamics of thepopulation of. granulipennis in thelong term is essential to develop effective protection and conservation plansthat take into account the loss of habitat and help eradicate invading andintroduced species.Fil: Pizarro Araya, Jaime. Universidad de La Serena; ChileFil: Alfaro, Fermín M.. Universidad de La Serena; ChileFil: Flores, Gustavo Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Provincia de Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Universidad Nacional de Cuyo. Instituto Argentino de Investigaciones de las Zonas Áridas; ArgentinaFil: Letelier, Luis. Universidad Nacional Autónoma de México; Méxic
Lilloiconcha lopezi Araya & Aliaga, 2015, new species
No full textLilloiconcha lopezi new species Figs. 1 A– 1 E. Diagnosis. Shell small, trochoid, slightly wider than high, with elevated spire; nearly five whorls, colored in bands of translucent caramel brown and white. Protoconch with 1.5 whorls, smooth. Teleoconch with about one hundred prosocline ribs (about 23 on last whorl), interspersed with many fine riblets; aperture circular, umbilicus ample and well developed. Description. Shell small (measuring up to 3.8 mm in width), trochoid, spire slightly elevated, shell height about 0.4 of shell width; with five and a half to six convex whorls. Protoconch clearly differentiated from teleoconch; of about one and a half whorls; almost smooth, sculptured only with very faint spiral threads, most noticeable near the sutures. Teleoconch of about four and a half whorls, sculptured with 96 to 104 prosocline coarse axial ribs, 21–24 of them on last whorl, with interspaces filled by about 15 to 21 slightly raised riblets; very faint irregular nodulae at their intersection with vestigial spiral threads, noticeable especially towards the sutures; suture deep and well-marked; aperture 0.4 of shell height, oval to almost circular; lip simple, callus a mere glaze; umbilicus very ample, deep, of about 0.3–0.4 of shell width; periostracum thin, projecting on the most prominent axial ribs; shell colored with alternating axial bands of translucent caramel brown and white. Animal unknown. Type material. Holotype: SBNHM 456358, paratypes: SBNHM 452239 (3 specimens), MPCCL 0 1572015 (2 specimens). All the material collected at the type locality by J. F. Araya & C. López, 0 3 th February 2014. Type locality. Los Molles (32 º 14 ’ S; 71 º 31 ’ W, 31 m), Commune of La Ligua, Region of Valparaíso, central Chile. Distribution and habitat. Only known from the type locality; the shells were found buried in humus and underneath stones, large boulders and rotten leaves. Etymology. Named in honor of our friend Christian López (Santiago, Chile). Remarks. The relationship of the new species with presumptive congeneric species from elsewhere in South America is still unknown; unfortunately all of the material consists only of empty shells and the diagnostic aspects of the anatomy, especially that of the penis, epiphallus and marginal radular teeth, are unknown. Hausdorf (2005) noted that although the protoconch of species in the genus appear to be smooth, it has spiral microsculpture when viewed in detail. This characteristic is apparent in the detail of the unworn sections of Fig. 1 E for the new species. Lilloiconcha lopezi is one of the largest species within the genus Lilloiconcha Thiele, 1927; among the congeneric species, only the Brazilian Lilloiconcha superba (Weyrauch, 1965) can be compared with the new species in size or morphometry; however it differs from Lilloiconcha lopezi in having a more elongated shell, with more whorls, less axial ribs (70 in L. superba and about a hundred in the new species) and a much smaller umbilicus (Miquel et al. 2007). Lilloiconcha tucumana Hylton Scott 1963, the type species of the genus, found in Tucumán, Horco Molle, northern Argentina, has a higher but comparatively smaller and much narrower shell, with more whorls (Fernández & Castellanos 1973). The new species differs from Lilloiconcha aysensis Miquel & Barker, 2009 —the only other Chilean species in the genus, described from Puerto Chacabuco, Aysén, about 1470 km from Los Molles—in having a much larger shell with a higher profile, sculptured with fewer and smaller axial ribs and in having an oval to almost circular aperture (which is subcircular and narrower in L. aysensis). This new species thus extends the distribution in Chile of the genus Lilloiconcha, previously known from the southern regions, to Los Molles, central Chile. Advancing our knowledge of the terrestrial malacological fauna in Chile is of high conservation importance given the ongoing increase in the introduction (or recognition) of nonindigenous or invasive land snails to the country, some of them a direct threat to micromollusks (Araya 2015). Further sampling in northern or central Chile will probably reveal more snail species to be discovered and described.Published as part of Araya, Juan Francisco & Aliaga, Juan Antonio, 2015, A new species of Lilloiconcha Weyrauch, 1965 (Pulmonata: Charopidae) from central Chile, pp. 295-297 in Zootaxa 4007 (2) on pages 295-296, DOI: 10.11646/zootaxa.4007.2.13, http://zenodo.org/record/24385
Food safety considerations for the assessment of a genetically modified tomato fortified for folate production. Mediterr J Nutr Metab (2010) 3:1–8
No full textCaulophacus (Caulophacus) chilense Reiswig & Araya, 2014, sp. n.
No full textCaulophacus (Caulophacus) chilense sp. n. (Figs. 1 & 2, Table 1) Material examined. Holotype: MNHNCL-POR 100, FV Juan Antonio, 0 7 January 2014, about 50 km NO of Caldera, Atacama Region, Chile. 26 ° 44 ’00” S; 71 °07’00” W, 1300–1800 m, dry. Description. The holotype (Fig. 1 A) is 320 mm in total length composed of an intact basal plate, 30 x 51 mm in widths, which was attached to hard substratum, a thin hollow curved stem 277 mm long, surmounted by a body 28 mm in height. The stem varies in diameter from 5.0 mm near the basal attachment to 8.4 mm just below the body; the lumen at the broken point 9 cm above the base is 2.0 mm in diameter and the wall is 1.5 mm in thickness. Loose spicules are absent from a few mm below the body attachment to its base. The body (Fig. 1 B) is a shallow funnel, 81 x 65 mm in diameters with a central depression of 10.4 mm. It is two mm thick at its rounded margin and 20 mm thick at the center. The upper (atrial) body surface (Fig. 1 C) is relatively smooth, covered by a very fine, inconspicuous, felt-like lattice of atrial spicules (Fig. 1 D). The lateral (dermal) surface (Fig. 1 E) is more transparent, with a conspicuous network of white strands of upward radiating choanosomal diactins surrounding large inhalant canals seen through the surface lattice (Fig. 1 E). The overlying lattice of dermalia and hypodermalia (Fig. 1 F) is thin and quite regular in arrangement. A marginal fringe is not evident at the junction of dermal and atrial surfaces. Color of the dry specimen is very light tan. Megascleres are dermal pinular hexactins and rare pentactins, atrial pinular hexactins and rare pentactins, choanosomal and stalk diactins, hypodermal and hypoatrial pentactins, and choanosomal hexactins. Spicule dimensions are given in Table 1. Dermalia are pinular hexactins and rare pentactins (Fig. 2 A) with bushy spindleshaped distal ray and entirely rough tangential and proximal rays. The pinular ray is quite variable in shape with a few ovoid in profile. Maximum thickness occurs at 65 % of the distance from the axial cross. About 4 % of these are pentactins. Atrialia (Fig. 2 B) are similar but slightly smaller than dermalia in mean dimensions and especially in maximum width of the pinular ray. The pinular rays of both dermalia and atrialia lack apical spines, their tips being gently rounded in profile. Choanosomal diactins of the body (Fig. 2 C) are slightly curved and have rounded, occasionally inflated, rough terminal ends with smooth caps. The central swelling is generally inconspicuous. The diactins of the stalk are fused by synapticula to form a rigid framework; they are larger than the free body diactins but otherwise similar. Hypodermalia (Fig. 2 D) are large regular oxypentactins, some of which bear macrospines near the base of their tapered rays: of 42 spicules examined, 45 % were entirely smooth, 19 % bore such spines only on proximal rays and 36 % had spines on both tangential and proximal rays. Rays end with subterminal roughness behind a smooth rounded cap. Hypoatrialia (Fig. 2 E) are much smaller, mean tangential rays are 62 % of those of dermalia. These spicules have macrospines on all tangential and proximal rays. Tangential ray ends are sharply pointed and rough. Choanosomal hexactins (Fig. 2 F) are larger than the hypodermalia and hypoatrialia. Their rays generally all bear macrospines (96 % of 168) but a few have them restricted to one short ray (1 %) and some bear no macrospines at all (2 %). Ray tips are rough and abruptly pointed. Microscleres are discohexactins (91 % of 200), hemidiscohexasters (5.5 %) and two forms of discohexasters (together 3.5 %). The discohexactins (Fig. 2 G) are generally regular with thorned rays ending in large semianchorate tips with 5–6 marginal claws. Occasionally one ray is bent back and very rarely the terminal disc is reduced to a single pointed hook. The hemidiscohexasters (Fig. 2 H) are similar to the discohexactins but one or more rarely two or three rays are divided near their origin into two terminal rays. Discohexasters A (Fig. 2 I) are as robust as the discohexactins but rare (0.2 %); each primary ray is divided near its origin into two or three terminal rays. Discohexasters B (Fig. 2 G) are much smaller and thinner than all other microscleres, are rare (3 %) and are restricted to the atrial side of the body. They have short primary rays divided into 2–5 straight terminal rays ending in small discs with 4–6 marginal claws. This spicule was not located in SEM preparations hence a light micrograph (Fig. 2 J) is used to document their occurrence and form. Etymology. The species name, chilense, refers to the location of collection: Chile. Remarks. The new specimen described here lacks onychoidal and oxyoidal microscleres and thus is excluded from the subgenera Caulodiscus Ijima 1927, Oxydiscus Janussen et al. 2004 and Caulophacella Lendenfeld 1915; it is assignable only to subgenus Caulophacus Schulze 1885. Within the subgenus, it cannot be assigned to C. antarcticus Schulze and Kirkpatrick 1910, C. basispinosus Lévi 1964, or C. galathea Lévi 1964 since these three species lack discohexasters. It is excluded from 13 species which possess lophodiscohexasters characterized by having four or more terminal rays on each primary ray: C. arcticus (Hansen, 1885), C. cyanae Boury-Esnault and De Vos 1988, C. discohexactinus Janussen et al. 2004, C, discohexaster Tabachnick and Lévi 2004, C. elegans Schulze 1885, C. hadalis Lévi 1964, C. instabilis Topsent 1910, C. latus Schulze 1886, C. oviformis Schulze 1886, C. pipetta (Schulze 1886), C. schulzei Wilson 1904, C. scotiae Topsent 1910 and C. variens Tabachnick 1988. Since the discohexactins of the new form are considerably less than 200 µm, it cannot be a member of the two species C. adakensis Reiswig and Stone 2013 or C. agassizi Schulze 1899. Finally, it is separated from C. abyssalis Tabachnick 1990 by the pinular rays of dermalia differing drastically in shape in the two forms and having a single length range instead of two size classes of those rays (126–299 µm in the new form vs 100–180 µm and 320–400 µm in C. abyssalis). Based upon these and many other differences from the presently recognized members of the subgenus, it is clear that the form described here is a new species designated here as Caulophacus (Caulophacus) chilense sp. n. Associated fauna only include the verrucid cirripedian Gibbosaverruca sp., with three specimens growing on the stalk of the new Caulophacus species; these barnacles are currently under description (Araya & Newman in preparation).Published as part of Reiswig, Henry M. & Araya, Juan Francisco, 2014, A review of the Hexactinellida (Porifera) of Chile, with the first record of Caulophacus Schulze, 1885 (Lyssacinosida: Rossellidae) from the Southeastern Pacific Ocean, pp. 414-428 in Zootaxa 3889 (3) on pages 419-423, DOI: 10.11646/zootaxa.3889.3.4, http://zenodo.org/record/22902
Música vol. 2 y 3
No full textEn octubre de este año se lanzó en la sala Isidora Zegers la nueva entrega de la propuesta del académico del Departamento de Música y Sonología de la Facultad de Artes profesor Carlos Araya. Se trata de los volúmenes II y III de su trabajo Música, cuyo primer volumen se publicó hace 40 años
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
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