196,709 research outputs found
Informational entropy of fractal river networks
No full textInformational entropy of river networks, as defined by Fiorentino and Claps (1992), proved to be a useful tool in the interpretation of several properties exhibited by natural networks. In this paper, self-similar properties of river networks are taken as the starting point for investigating analogies and differences between natural networks and geometric fractal trees, comparing their variability entropy with parameters of both classes of networks. Attention is directed particularly to relations between entropy and Horton order and entropy and topological diameter of subnetworks. Comparisons of these relations for fractals and natural networks suggest that network entropy can contribute to clarify important points concerning self-similar properties of river networks. Moreover, the estimation of the fractal dimension of branching for natural networks can be considerably improved using the relation between entropy and Horton order throughout the network
Ramazzottius saltensis Claps & Rossi 1984
No full text124. Ramazzottius saltensis (Claps & Rossi, 1984) [T] Hypsibius saltensis sp. nov. (Claps & Rossi 1984) Terra typica: Argentina (South America) Argentina: • 24 ° 55 ′S, 64 °09′W; 400 m asl: Type Locality: Salta Province, road from Las Lajitas to J.V. González, lichens on tree in the mountains (6 samples). Claps & Rossi (1984) Record numbers: Argentina: 1; total: 1. Remarks: This species is currently endemic to Argentina.Published as part of Kaczmarek, Łukasz, Michalczyk, Łukasz & Mcinnes, Sandra J., 2015, Annotated zoogeography of non-marine Tardigrada. Part II: South America, pp. 1-107 in Zootaxa 3923 (1) on page 53, DOI: 10.11646/zootaxa.3923.1.1, http://zenodo.org/record/24193
On What Can Be Explained by the Entropy of a Channel Network
No full textA measure of the entropy associated with a channel network is defined, according to the Shannon informational definition, as the expectation of (-log pj), where pj is the ratio of the existing paths at the bifurcation level j to the total number of paths. Here j and pj are respectively proportional to the arrival time of water to the network outlet and to the number of water parcels arriving from the distance j. The expression for the channel network entropy proposed in this paper is well suited for hydrologic purposes. It is shown that the network entropy is strictly related to basin characteristics such as average elevation, Horton order, and magnitude. -from Author
Paramacrobiotus rioplatensis Claps & Rossi 1997
No full text211. Paramacrobiotus rioplatensis (Claps & Rossi, 1997) [T] Macrobiotus rioplatensis sp. n. (Claps & Rossi 1997) Terra typica: Uruguay (South America) Uruguay: • 34 ° 25 ′S, 57 ° 44 ′W; 50 m asl: Type Locality: Colonia Department, Riachuelo, 223 km W of Montevideo, lichens on tree on the banks of the Rio de la Plata. Claps & Rossi (1997) Record numbers: Uruguay: 1; total: 1. Remarks: Currently endemic to Colombia, this species belongs to the Paramacrobiotus areolatus group (see: P. areolatus and P. richtersi above).Published as part of Kaczmarek, Łukasz, Michalczyk, Łukasz & Mcinnes, Sandra J., 2015, Annotated zoogeography of non-marine Tardigrada. Part II: South America, pp. 1-107 in Zootaxa 3923 (1) on page 88, DOI: 10.11646/zootaxa.3923.1.1, http://zenodo.org/record/24193
Minibiotus claxtonae Rossi, Claps & Ardohain, 2009, sp. nov.
No full text<i>Minibiotus claxtonae</i> sp. nov. <p>Fig. 5</p> <p> <b>Material examined:</b> Holotype and paratypes from lichen samples on trees, collected near Quillen Lake, Aluminé during January of 2005.</p> <p> <b>Type repository:</b> The holotype (slide N° Nq 11.11) is preserved at the Museum of La Plata (La Plata University). The paratypes are preserved in the collection of G. Rossi and M. C. Claps</p> <p> <b>Specific diagnosis:</b> The cuticle is largely smooth, but with 10 transverse bands of roughness. Star-shaped pores are present on the cuticle surface and on all pairs of legs. Eye spots are also present. The buccal tube contains two curvatures. The insertion of the stylet support is near the middle of the buccal tube and is nearest to the pharyngeal bulb; the pharynx exhibits apophyses, three square macroplacoids, and a small microplacoid. On all legs there is granulation along with small, smooth lunules. The eggs contain cup-shaped processes and are not covered by a membrane.</p> <p> <b>Description of the holotype:</b> The body length is 208 µm with posterior eyes present (Fig 5 A). The cuticle is smooth, with 10 transverse bands and pores having two shapes: small and round (nearly 1 µm in diameter) or conspicuously star-shaped. These stellate pores are aligned in longitudinal rows and separated, and the round rings are intermixed (Fig. 5 E). Each leg contains stars and granulation that appear denser at the end of the legs on all four pairs (Fig. 5 C). The mouth is anteroventral with a buccal tube 23 µm long and 2 µm wide (<i>pt</i> = 8.7), having two bends (anterior and posterior). The pharyngeal bulb is with noticeable apophyses, three near-square macroplacoids, and a small microplacoid. The stylets are inserted at 16 µm (<i>pt</i> = 69.6). The macroplacoid lengths are very similar: the first, 2.2 µm (<i>pt</i> = 9.6); the second; 2 µm (<i>pt</i> = 8.7); and the third, 2.3 µm (<i>pt</i> = 10.0). The small microplacoid is 1 µm long (<i>pt</i> = 4.3). The macroplacoid row is 9 µm long (<i>pt</i> = 39.1) (Fig. 5 B). The claws are short and robust, with smooth lunules and the primary branches of internal and external claws have distinct accessory points (Fig. 5 D).</p> <p> The eggs have a non-reticulated shell. The egg diameter, with and without processes, fluctuates between 82–86 µm and 68–70 µm, respectively. There are <i>ca</i>. 22 processes around the egg's circumference and nearly 62 are found within a given hemisphere. The processes are in the form of an egg cup. Each process is not covered by a separate membrane, is without ornamentation at the base, and has a length of 7 µm and a width at the base of <i>ca.</i> 5 µm (Fig. 5 F).</p> <p> <b>Etymology:</b> This species is named after Dr. Sandra Claxton of the Macquarie University, Australia in recognition of her contribution to our knowledge of the genus <i>Minibiotus</i> in particular and to our understanding of the tardigrades in general.</p> <p> <b>Differential diagnosis:</b> <i>Minibiotus claxtonae</i> <b>sp. nov.</b> differs from <i>Minibiotus hufelandioides</i> (Murray, 1910) by its smaller macroplacoids, the first macoplacoid not being obscured by the apophysis, and the absence of denticles in the lunules. In the egg, a ring of pores at the base of the processes is absent. <i>Minibiotus claxtonae</i> <b>sp. nov.</b> differs from <i>Minibiotus aquatilis</i> Claxton, 1998 mainly by characteristics of the egg. The <i>pt</i> values of different structures are very similar but the absence of denticles in the lunules is evident.</p> <p> <b>Remarks:</b> The measurements and <i>pt</i> values of selected morphological structures for all specimens are given in Table 5</p>Published as part of <i>Rossi, Gustavo, Claps, Maria & Ardohain, Diego, 2009, Tardigrades from northwestern Patagonia (Neuquén Province, Argentina) with the description of three new species, pp. 21-36 in Zootaxa 2095</i> on pages 32-33, DOI: <a href="http://zenodo.org/record/187610">10.5281/zenodo.187610</a>
Dichiarazione Ambientale del Centro Ricerche ENEA Trisaia
No full textLa Dichiarazione Ambientale costituisce il documento con cui il Centro Ricerche Trisaia presenta periodicamente gli sviluppi delle performance del proprio sistema di gestione integrato Ambiente e Sicurezza e comunica al pubblico, attivamente e con trasparenza, le prestazioni ambientali delle proprie attività e i risultati raggiunti rispetto agli obiettivi fissati. Gli obiettivi di miglioramento stabiliti per gli aspetti ambientali diretti (consumo di energia, consumo risorse idriche, produzione rifiuti, impiego sostanze pericolose) e indiretti (rapporti con il territorio, con appaltatori e fornitori esterni ecc.) risultano ampiamente conseguiti. La dichiarazione ambientale oltre a contenere informazioni sull’organizzazione, sulla politica integrata Ambiente e Sicurezza e sul sistema di gestione, descrive il Centro, gli aspetti ambientali e di sicurezza e gli obiettivi di volta in volta prefissati. La validità della Dichiarazione è triennale e annualmente vengono predisposti gli aggiornamenti
Macrobiotus neuquensis Rossi, Claps & Ardohain, 2009, sp. nov.
No full textMacrobiotus neuquensis sp. nov. Figs. 1–2 Material examined: The holotype and the paratypes are from moss samples on soil and rock collected in Hua Hum, Junín de los Andes, at ca. 700 m asl (40 °07’S 71 ° 39 ’ W), and from mosses on soil and lichen on a tree near Rucachoroi Lake, Aluminé, at ca. 900 m asl (39 ° 12 ’ S, 70 ° 55 ’ W), collected in December, 2004. Type repository: The holotype (slide N° Nq. 6.6) is preserved at the Museum of La Plata (La Plata University). The paratypes are preserved in the collection of G. Rossi and M. C. Claps. Specific diagnosis: Macrobiotus with an oral-cavity armature of the harmsworthi type, three macroplacoids, and one microplacoid; with eye spots, cuticle smooth, legs without granulation, claws of the hufelandi type, lunules smooth on all legs, the presence of a cuticular bar on the first three pairs of legs, and a refractile zone. These structures are less visible on the fourth pair of legs. The eggs have conical processes with reticular sculpture, all of them in contact with each other. The chorion is invisible. Description of the holotype: The body length is 503.4 µm. The body (Fig. 1 A) is transparent (white) with eyes in anterior position (Fig. 2 A). The cuticle is smooth, without pores or pearls. The mouth is anterior and surrounded by a ring of 10 peribuccal lamellae. The oral-cavity armature is of the harmsworthi type. The teeth of the anterior band—or first band according to the Michalczyk and Kaczmarek (2003) terminology—are smaller, within the anterior border, and are in contact with the lamellae. The posterior band of teeth in the shape of a crown (second band) consists of conical teeth with granules in the posterior portion. The transverse ridges (third band) are small, while the laterals have a smooth margin. The buccal tube is 52 µm long and 10 µm wide (pt = 19.2) (Figs. 1 B, 2 A). Stylet supports are inserted on the buccal tube at 38 µm (pt = 73). The pharyngeal bulb is oval with distinct, triangular apophyses, three macroplacoids, and a microplacoid. The first macroplacoid is wider in the middle section, its length being 9.3 µm (pt = 17.8); the second, more pyramidal, is 8.2 µm long (pt = 15.7); the third is 10.2 µm long (pt = 19.6) and with a structurally different constriction in its terminal part. The microplacoid is 6 µm long (pt = 11.5) and separate from the third macroplacoid. The macroplacoid row is 28 µm long (pt = 53.8; Figs. 1 B, 2 A). The claws are of the hufelandi type, having primary branches with distinct accessory points (Fig. 2 B). The lunules are smooth on all legs (Fig. 2 C). Between the lunules and the refractile zone of the first three pairs of legs there is a cuticular bar (Fig. 2 B), only visible under phase contrast or by DIC and not detected on the fourth pair of legs. On the first pair of legs, the primary branch has a basal portion and measures 12 µm (pt = 23.0), while the secondary branch is 10.5 µm long (pt = 20.1). On the second pair of legs, the primary and secondary branches are 12 (pt = 23.0) and 10 µm (pt = 19.2), respectively. On the third and fourth pair of legs, these branches measure 11 (pt = 21.1) and 8 µm (pt = 15.3) and 11 (pt = 21.12) and 9 µm (pt = 17.3), respectively. The eggs, laid freely, are spherical and contain conical processes having a truncated apex (Fig. 2 D). The processes, 9–12 around the circumference, have a 10–25 µm diameter at their base (Fig. 2 F). The surface of the processes contains dense and uniform reticular sculpture with isodiametric meshes (Fig. 2 E). The bases of the processes are in contact, and the union with the shell is by either connecting cords or a continuation of the sculpture itself, for this reason the shell is not visible (Fig. 2 F). The processes are 7–15 µm height. We found one egg with an embryo (Table 2), thus allowing us to confirm that the eggs are without a doubt from M. neuquensis sp. nov. (Fig. 2 D). Etymology: The name neuquensis refers to the province that includes the locus typicus of this new species. Differential diagnosis: Macrobiotus neuquensis sp. nov. belongs to the harmsworthi group, whose species exhibit the following characteristics in common: three macroplacoids in the form of an arch, a microplacoid in the pharyngeal bulb, plus a cuticle without pores. The presence of the cuticular bar and a refractile zone in the legs along with the eggs having conical processes in contact with one another are the principal characteristics differentiating M. neuquensis sp. nov. from the other species of the group. This new species is similar to Macrobiotus chieregoi Maucci & Durante 1980, but differs from the latter by having eyes and a wider buccal tube. In addition, the processes of the eggs of M. neuquensis sp. nov. are shorter than those of M. chieregoi. Macrobiotus neuquensis sp. nov. differs from Macrobiotus krynauwi Dastych & Harris 1995 in having a smooth cuticle without pearls, a longer and wider buccal tube, bigger macroplacoids, and smaller claws. Macrobiotus neuquensis sp. nov. also differs from Macrobiotus blocki Dastych 1984 and Macrobiotus ovostriatus Pilato & Patané 1998 with respect to the characteristics of the eggs (Table 3). Macrobiotus neuquensis sp. nov. is furthermore unlike Macrobiotus reinhardti Michalczyk & Kaczmarek 2003 in having a shorter third macroplacoid, a wider buccal tube, and longer processes on the eggs, among other morphological features. Remarks: Measurements and pt values of selected morphological structures for all specimens are presented in Table 2. Diameter 87–94 42–55 69–84 43–82 70–90 64–70 98–115 without processesPublished as part of Rossi, Gustavo, Claps, Maria & Ardohain, Diego, 2009, Tardigrades from northwestern Patagonia (Neuquén Province, Argentina) with the description of three new species, pp. 21-36 in Zootaxa 2095 on pages 24-28, DOI: 10.5281/zenodo.18761
Hemiberlesia lataniae
No full textHemiberlesia lataniae (Signoret, 1869) Especie cosmopolita y polífaga; en la Argentina es frecuente pero no reviste importancia (Claps y Wolff 2003). Plantas huéspedes: Mangifera indica, M. paradisiaca y P. americana. Se la encontró en forma ocasional y sobre hoja principalmente. Material estudiado. Argentina-Tucumán: Chicligasta-Muyo (27°22 ′ 05,20 ″ S, 65°41 ′ 20,90 ″ O, 489 m. s.n.m. de altitud), 5 hembras adultas, 2 preparaciones microscópicas, 09.jul.2013 y 20.oct.2013, ex Persea americana, (nº col.765; 767-7), 4 hembras adultas, 2 preparaciones microscópicas, 09.jul.2013, ex Musa paradisiaca (nº col. 761 y 763), todas Amún C col. y det.; Famaillá-El Guayal (27°03 ′ 89 ″ S, 65°24 ′ 07 ″ O, 367 m. s.n.m. de altitud) 9 hembras adultas, 3 preparaciones microscópicas, 20.may.2002, M.C.G.de Willink col., ex Persea americana, Claps L. det. (nº col. 331; 345-01; 345-02); Salta: Hipólito Yrigoyen (23°15 ′ 0.47,00 ″ S, 64°16 ′ 28.58 ″ O, 319 m. s.n.m. de altitud) 8 hembras adultas, 3 preparaciones microscópicas, 10.abr.2012, Amún C. y Claps L. col., ex Mangifera indica, Claps L. det. (nº col. 762- 1,762-2 y 762-3).Published as part of Amún, Cristian & Claps, Lucía E., 2015, Listado actualizado de diaspídidos sobre frutos tropicales y primer registro de Pseudaulacaspis cockerelli (Cooley) (Hemiptera: Diaspididae) para la Argentina, pp. 1-11 in Insecta Mundi 2015 (449) on page 4, DOI: 10.5281/zenodo.535319
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