179,464 research outputs found
Podosirus Bellan-Santini 2007
No full textPodosirus Bellan-Santini, 2007 Podosirus Bellan-Santini, 2007: 569. Type species. Podosirus spinosa Bellan-Santini, 2007 (lapsus calamus), Podosirus vaderi Bellan-Santini, 2007 selected here. Included species. Podosirus includes 1 species: P. vaderi Bellan-Santini, 2007. Diagnosis. With the characters of the family. Remarks. Bellan-Santini (2007) originally designated P. spinosa as the type species of Podosirus. She has since indicated (in litt.) that she intended the type species to be P. v a d e r i. Distribution. Lucky Strike site, Mid-Atlantic Ridge, North Atlantic Ocean.Published as part of Myers, A, 2012, Podosiridae, a new family of North Atlantic deep sea amphipod (Crustacea, Amphipoda), pp. 81-84 in Zootaxa 3546 on page 84, DOI: 10.5281/zenodo.21079
Reply to comment by R. L. Lysak on “Improved basis set for low frequency plasma waves”
No full textIn a Comment, R. L. Lysak argues against the validity of Bellan (2012) on the grounds that this paper uses fluid rather than kinetic theory. The Comment invokes a commonly used method for reducing the 3×3 wave equation matrix to a 2×2 matrix which then gives approximate dispersion relations. In this Response, it is shown that the same 3×3 wave equation matrix can be obtained from fluid theory and certain mathematical inconsistencies in the method of analysis used in the Comment are identified. It is shown that the dispersion relation derived in Bellan (2012) provides a much better description of the experimental observations reported by Kletzing et al. (2003) than does the dispersion relation proposed in the Comment and in Lysak and Lotko (1996)
Sulle tracce di Lukács, recensione di R. Dannemann (hrsg.), Lukács und 1968. Eine Spurensuche, Bielefeld 2009
No full textHaploops Liljeborg 1856
No full textGenus Haploops Liljeborg, 1856 Haploops Liljeborg, 1856: 135; Barnard, 1969: 132; Karaman, 1975: 57; Lincoln, 1979: 124; Bellan-Santini, 1982: 64; Barnard & Karaman, 1991: 90; Lowry & Myers, 2017: 58. Type species. Haploops tubicola Liljeborg, 1856, original designation.Published as part of Kaim-Malka, R. A., Bellan-Santini, D. & Dauvin, J. C., 2021, Complement to the knowledge of the Haploops species (Crustacea, Gammaridea Ampeliscidae), with the description of two new species from North Atlantic Ocean [Contribution to the knowledge of the Haploops genus. 10.], pp. 151-175 in Zootaxa 5048 (2) on page 152, DOI: 10.11646/zootaxa.5048.2.1, http://zenodo.org/record/555191
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Rhachotropis
No full textThe <i>Rhachotropis</i> species (Fig. 12) of Mid-Atlantic Ridge deep-sea hydrothermal vents: <i>R. flamina, R. licornia,</i> <i>R. pilosa</i> Bellan-Santini, 2006 <p> SME taxonomists also have taken part in the major adventure started with the 1977 discovery of deep-sea chemosynthetic animal communities. In the vicinity of hydrothermal vents of the Mid-Atlantic Ridge, 3 new species of <i>Rhachotropis</i> (Crustacea: Amphipoda: Eusiridae) were collected by sediment traps at 1700–2750 m depth: <i>Rhachotropis flamina</i> Bellan-Santini, 2006, <i>Rhachotropis licornia</i> Bellan-Santini, 2006, and <i>Rhachotropis pilosa</i> Bellan-Santini, 2006.</p> <p> With 63 species (Horton <i>et al.</i> 2021) this genus is found in all oceans with a large bathymetric distribution (0–7160 m) (L̂rz <i>et al.</i> 2018). It is the most common amphipod genus in bathyal and abyssal zones.</p> <p> Morphologically, <i>Rhachotropis</i> have a delicate body with slender pereiopods, long antennae and sometimes dorsal processes. However, some of them display antennae bearing complex and puzzling structures called calceoli (present in <i>R. pilosa</i> and <i>R. licornia</i>) that are believed to be part of sensory organs. Cuplike receptacles, arranged serially on the antennae, would act as non-visual sensory organs, ensuring the perception of sound and vibration stimuli by the amphipods. These likely mechanoreceptors are found in several amphipod species (Hurley 1980, Lincoln & Hurley 1981, Bellan-Santini 2015); some could be involved in the detection of mates, others to detect preys. However, at hydrothermal vents, they could also be a good way to locate active fluid emissions.</p>Published as part of <i>Boury-Esnault, Nicole, Bellan, Gerard, Bellan-Santini, Denise, Boudouresque, Charles-Francois, Chevaldonné, Pierre, Dias, Alrick, Faget, Daniel, Harmelin, Jean-Georges, Harmelin-Vivien, Mireille, Lejeusne, Christophe, Perez, Thierry, Vacelet, Jean & Verlaque, Marc, 2023, The Station Marine d'Endoume, Marseille: 150 years of natural history, pp. 213-252 in Zootaxa 5249 (2)</i> on page 240, DOI: 10.11646/zootaxa.5249.2.3, <a href="http://zenodo.org/record/7687250">http://zenodo.org/record/7687250</a>
Haploops truncata Kaim-Malka & Bellan-Santini & Dauvin 2021, spec. nov.
No full textHaploops truncata spec. nov. (Figures 5–8) Type material. HOLOTYPE. One female without oostegite. Length: 5.57 mm (Fig. 5). BIOICE: Station 3140; one specimen, 25 August 1999, depth: 768 m, 67°51.90’N – 22°14.89’W, bottom: sediment type unknown. Holotype IINH 42245 + slides IINH 42247. The specimen is deposited in the Icelandic Museum of Natural History in Reykjavik (IMNHR). BIOICE material. The specimens are deposited in the Icelandic Museum of Natural History in Reykjavik (IMNHR). Station 2011: one specimen, 20 July 1991, depth: 768 m, 65°41.43’N – 11°16.77’W; sediment type unknown (IINH 42251). Station 2414: three specimens, 20 July 1991, depth 978 m, 65°35.01’N – 10°59.98’W; bottom: brown sandy, silt mixed with foraminifera (IINH 42250). Station 2897: eight specimens, 24 August 1996, depth 672 m, 65°29.44’N – 27°32.55’W; sediment type unknown (IINH 42249). Station 2898: one specimen, 24 August 1996, depth 672 m, 65°29.30’N – 27°32.70’W; sediment type unknown (IINH 42248). Station 3140: one specimen, 25 August 1999, depth 768 m, 67°51.90’N – 22°14.89’W; sediment type unknown (IINH 42245). Station 3501: two specimens, 31 August 2002, depth 829 m, 62°59.84’N – 20°30.25’W; sediment type unknown (IINH 42246). Male unknown. Ethymology. The species name refers to the shape of the head (square) with the lateral lobe truncate. Diagnosis. Pereon, Pleon and Urosome without long dorsal setae, Head square with anterior margin straight (lateral lobe truncate). One pair of superior corneal lenses. Antenna 1 length = 0.8 Antenna 2 length; Antenna 2 as long as body length (0.876). Coxa 4 external side bearing numerous short setae. Description. Holotype. Female without oostegites. Length: 5.57 mm (Fig. 5). Body without long dorsal setae on the pereon, pleon and urosome. Head (Fig. 6A): square with anterior margin straight, one pair of superior corneal lenses. Antenna 1 (Fig. 6B): shorter than antenna 2, peduncle of A1 with article 3 ischium + merus + carpus. The margins of the different articles of pereopod 3, except dactylus, bearing few long setae; dactylus slender, curved and longer than propodus (dactylus length / propodus length = 1.35) (27/20). Pereopod 4 (Fig. 7E): coxa 4 square-shaped, external side bearing numerous short setae; anterior margin straight, length / width = 43/40, antero-ventral corner quadrate but not sharp, ventral margin straight with short setae, posterior concavity = 0.46 (17/37) length of the posterior length of the coxa 4, posterior hook broad, length = 17/42 width of coxa 4, posterior corner blunted; basis length> ischium + merus; the margins of the different articles of pereopod 4, except dactylus, bearing few long setae; dactylus slender, slightly curved and longer than propodus (dactylus length / propodus length = 1.125 (27/24). Pereopod 5 (Fig. 7F): coxa 5 rectangular, basis roughly rectangular with few setae on the anterior margin; carpus rectangular, anterior margin with few setae, posterior margin with two rows of little spines, distal margin with short spines and a long one; propodus rectangular, longer than carpus, with few short setae, and a long distal seta; dactylus short and curved, dactylus length / propodus length = 0.23 (12/51). Pereopod 6 (Fig. 8A): coxa 6 roughly trapezoidal shaped, posterior margin rounded; basis rounded with few short setae and spines on the anterior margin; carpus rectangular, anterior margin with few short setae, posterior margin with two rows of little spines, postero-distal lobe ornamented with short spines and a very long one; propodus a little longer than carpus, with few short setae, and a long distal seta; dactylus short and curved, dactylus length / propodus length = 11/40. Pereopod 7 (Fig. 8B): coxa 7 roughly rectangular; basis narrow (length without lobe / width = 80/35 = 2.28), anterior and posterior margin slightly concave, lobe slightly deflected, rounded with few long setae, reaching the merus; ischium quadrangular; merus rectangular with an antero-inferior lobe ending with a spine, posterior margin ornamented with few little spines; carpus pyriform (width / length = 17/20), with strong spines on the anterior and posterior margin (propodus length / carpus length = 15/20; propodus + dactylus / carpus = 23/20); propodus narrow, width / length = 5/15 (propodus width / carpus width = 5/17), with short apical setae; dactylus rectangular, short and narrow (length / width = 7/1) with two very small apical setae (dactylus length / propodus length = 8/15). Pleon (Fig. 5): the postero-dorsal segments of the pleon without setae. Epimeral plate 1 (Fig. 8C): anterior margin oblique and straight, ventral margin rounded, posterior margin slightly convex. Epimeral plate 2 (Fig. 8C): square shaped, anterior and posterior margin straight, inferior one slightly convex, postero-inferior corner rounded. Epimeral plate 3 (Fig. 8C): square shaped, anterior and posterior margin straight, inferior one slightly convex, corners rounded. Urosome (Fig. 5): the urosome segment 1 has a dorsal carina straight, moderately hight, with the apex rounded. Uropod 1 (Fig. 8D): long, rami slender, curved, and equal length; inner ramus with two little spines; peduncle longer than the ramus, with one spine on the distal margin. length rami / length peduncle = 54–56 / 64. Uropod 2 (Fig. 8E): shorter than Uropod 1; rami triangular and short, inner ramus shorter than the outer one, with a row of spines on each ramus, outer ramus length / peduncle length = 78 /102; peduncle rectangular, robust with a strong spines on the distal margin. Uropod 3 (Fig. 8F): peduncle short and strong (length / width = 58/35); rami of unequal length, roughly rectangular, longer than peduncle (rami length / peduncle length = 90–100/58); inner ramus with three spines and some apical setae, outer ramus with apical long setae and also some long setae on the outer margin. Telson (Fig. 8G): triangular, apically rounded, cleft on 25/35 of the length; one seta present on the apical part of each lobe. Distribution: North Atlantic Ocean; this species was collected between 672 m and 978 m. The nature of the bottom is indicated for only one sample: brown sandy silt mixed with foraminifera. Taxonomic remarks. H. truncata is probably a non mature female, but the original characters in the sub-group with superior corneal lenses justify its description as a new species. H. truncata belongs to the sub-group with the superior pair of corneal lenses clearly visible; the inferior pair is absent; a narrow Pereopod 7 basis, and the absence of dorsal tuft, this sub-group includes six other species: H. tubicola, H. spinosa, H. descansa, H. fundiensis, H. oonah, and H. antennata. H. truncata differs from the other neighbouring species by the following characters: — Head square with anterior margin straight (oblique in H. tubicola; H. spinosa; H. fundiensis; H. antennata). — Antennae subequal, Antenna 2 near the body length; in H. tubicola, the antennae are subequal and reach 2/3 of the body length; they reach 1/3 of the body length for H. fundiensis; in H. spinosa the Antenna 2 length is include between 1/3 and 1/2 of body length. For the two other species, H. descansa and H. oonah, the Antenna 1 is half the length of Antenna 2; whereas in H. antennata, the Antenna 1 is longer than Antenna 2. — Coxa 4 square-shaped, external side bearing numerous short setae. — Epimeral plate 3 square shaped; the posterior margin is oblique or slightly curved in the other species (except for H. descansa). — Uropod 1 long, with rami slender, curved, and of equal length; they are of unequal length for H. tubicola, H. descansa, H. fundiensis, H. oonah and H. antennata (except H. spinosa with rami of equal length, and especially as Uropod 2 rami are strongly armed). In the introduction we indicate that it is necessary to supplement the description of two species described by Stephensen in 1925: Haploops vallifera and Haploops similis. This is the object of the following section.Published as part of Kaim-Malka, R. A., Bellan-Santini, D. & Dauvin, J. C., 2021, Complement to the knowledge of the Haploops species (Crustacea, Gammaridea Ampeliscidae), with the description of two new species from North Atlantic Ocean [Contribution to the knowledge of the Haploops genus. 10.], pp. 151-175 in Zootaxa 5048 (2) on pages 157-161, DOI: 10.11646/zootaxa.5048.2.1, http://zenodo.org/record/555191
FIGURE 1 in On some Haploops species collected in the North Atlantic Ocean with the description of Haploops islandica n. sp. (Crustacea: Gammaridea: Ampeliscidae) [Contribution to the knowledge of the Haploops genus. 8.]
No full textFIGURE 1. Distribution of the four Haploops species studied: H. carinata, H. setosa, H. robusta, H. islandica. Position of the Bioice stations where the specimens of Haploops were collected. For the species H. carinata and H. islandica, some stations are very near, and to the scale of the map, they appear fused, so than their number is different from the number indicated in the text.Published as part of Kaim-Malka, R. A., Bellan-Santini, D. & Dauvin, C., 2016, Zootaxa 4179 (1), DOI: 10.11646/zootaxa.4179.1.2, http://zenodo.org/record/26056
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