53,400 research outputs found
Lissodendoryx (Lissodendoryx) littoralis Ott & Reiswig & Harbo 2019, n. sp.
No full textLissodendoryx (Lissodendoryx) littoralis n. sp. Table 4, Figure 2 Diagnosis. Encrusting on mud-covered pebbles on intertidal mudflat, mostly buried in mud with surface fistulae rising above mud. Main body of the sponge grows by coalescence of fistulae. Etymology. The species name derives from the intertidal habitat of the sponge. Material Examined. Holotype: RBCM holotype 019-00102-001, Stn. BO 18-07, Ladysmith Harbour, BC, 49° 1.484’ N / 123° 50.889’ W, 13 Aug 2018, coll. B. Ott, R. Harbo, low littoral, 1 specimen. Other material examined. RBCM 019-00103 - 001, Stn. BO 16-05, Head of Ladysmith Harbour, 49° 1.484’ N / 123° 50.889’ W, coll. B. Ott, R. Harbo, 4 Aug 2016, low littoral, 1 specimen; four stations were sampled at Bush Creek, Ladysmith Harbour, 49° 1.072’ N / 123° 50.567’ W, coll. B. Ott, R. Harbo, R. Waters, 10 Sep 2018, low littoral, RBCM 019-00104 - 001, Stn. BO 18-03, 1 specimen; RBCM 019-00104 - 002,, Stn. BO 18-04, 1 specimen; RBCM 019-00104 - 003, Stn. BO 18-05, 1 specimen; RBCM 019-00104 - 004, Stn. BO 18-09 a, 2 specimens.Published as part of Ott, B., Reiswig, H. M. & Harbo, R., 2019, New Species of Lissodendoryx Topsent, 1892 (Demospongiae, Poecilosclerida Coelosphaeridae) and Myxilla Schmidt, 1862 (Demospongiae, Poecilosclerida Myxillidae) from the Northeast Pacific, pp. 1-29 in Zootaxa 4700 (1) on page 9, DOI: 10.11646/zootaxa.4700.1.1, http://zenodo.org/record/354525
Negative Differential Conductivity in an Interacting Quantum Gas
No full textNegative differential conductivity (NDC) is a widely exploited mechanism in many areas of research dealing with particle and energy transport. We experimentally realize such a many body quantum transport system based on ultracold atoms in a periodic potential. We prepare our system by loading Bose condensed rubidium atoms in a 1D optical lattice with high atom occupancy per lattice site. Subsequently, we remove all the atoms from a central lattice site. While the atoms from neighboring sites tunnel into the empty site, we observe NDC in the resulting current voltage characteristics and investigate the microscopic mechanism behind it [R. Labouvie, B. Santra, S. Heun, S. Wimberger, H. Ott, arXiv:1411.5632]
Lissodendoryx (Lissodendoryx) barkleyensis Ott & Reiswig & Harbo 2019, n. sp.
No full textLissodendoryx (Lissodendoryx) barkleyensis n. sp. Table 3, Figure 1 Diagnosis. Lissodendoryx (L.) barkleyensis n. sp. is the only shallow cave-dwelling Lissodendoryx recorded for Southern BC. The combination of cave habit, amorphous habitus, micropapillate surface, and spicule form and dimensions distinguish this species from other described Lissodendoryx (Lissodendoryx). Etymology. The sponge is named after the location, Barkley Sound, BC. Material Examined. Holotype: RBCM holotype 019-00101-001, Stn KML 135 c/75, Execution Rock Cave, Barkley Sound, BC, 48° 49.9’ N / 125° 10.7’ W, coll. W.C. Austin 1975, low littoral.Published as part of Ott, B., Reiswig, H. M. & Harbo, R., 2019, New Species of Lissodendoryx Topsent, 1892 (Demospongiae, Poecilosclerida Coelosphaeridae) and Myxilla Schmidt, 1862 (Demospongiae, Poecilosclerida Myxillidae) from the Northeast Pacific, pp. 1-29 in Zootaxa 4700 (1) on page 3, DOI: 10.11646/zootaxa.4700.1.1, http://zenodo.org/record/354525
Lissodendoryx (Lissodendoryx) toxaraphida Ott & Reiswig & Harbo 2019, n. sp.
No full textLissodendoryx (Lissodendoryx) toxaraphida n. sp. Table 5, Figure 3 Diagnosis. Microscleres include toxiform raphides, unreported in other species of Lissodendoryx (Lissodendoryx) including the other new species described in this report. Etymology. The species name refers to the presence of toxa-shaped raphides. Material Examined. Holotype: RBCM holotype 019-00105-001, Stn. NM 281, Knight Inlet Sill, BC, 50° 41.163’ N / 125° 59.782’ W, coll. N. McDaniel, 27 Mar 2012, 18 m depth, 1 specimen.Published as part of Ott, B., Reiswig, H. M. & Harbo, R., 2019, New Species of Lissodendoryx Topsent, 1892 (Demospongiae, Poecilosclerida Coelosphaeridae) and Myxilla Schmidt, 1862 (Demospongiae, Poecilosclerida Myxillidae) from the Northeast Pacific, pp. 1-29 in Zootaxa 4700 (1) on page 12, DOI: 10.11646/zootaxa.4700.1.1, http://zenodo.org/record/354525
Sample Selection Models in R: Package sampleSelection
No full textThis paper describes the implementation of Heckman-type sample selection models in R. We discuss the sample selection problem as well as the Heckman solution to it, and argue that although modern econometrics has non- and semiparametric estimation methods in its toolbox, Heckman models are an integral part of the modern applied analysis and econometrics syllabus. We describe the implementation of these models in the package sampleSelection and illustrate the usage of the package on several simulation and real data examples. Our examples demonstrate the effect of exclusion restrictions, identification at infinity and misspecification. We argue that the package can be used both in applied research and teaching.
Letter from Arno B. Cammerer to J. R. Eakin
No full textLetter from Arno B. Cammerer to J. R. Eakin describing the procedure for purchasing Bright Angel Trail
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
Arauchemus miudo Ott & Brescovit, 2012, sp. nov.
No full text<i>Arauchemus miudo</i> sp. nov. <p>Figs 1C, D; 3; 6; 7B; 8B; 9</p> <p> <b>Type material. Holotype:</b> male from CPCN Pró-Mata, Potreiro Velho, São Francisco de Paula, Rio Grande do Sul, Brazil, 07.IV.2001, R. Ott leg. (MCN 47642). <b>Paratypes:</b> 1 female, 07.VII.2001 (MCN 47650); 1 female, 02.II.2001 (MCN 47651); 5 males, 07.IV.2001 (MCN 47652); 1 female, 25.X.2000 (MCN 47653); 2 females, 14.IV.2001 (MCN 47654); 4 males, 07.IV.2001 (MCN 47655); 2 females, 02.II.2002 (MCN 47656); 1 female, 02.I.2001 (MCN 47657); 1 female, 02.I.2001 (MCN 47659); 5 males, 07.IV.2001 (MCN 47660); 2 males, 14.IV.2002 (IBSP 160962); 1 male, 14.IV.2002 (IBSP 160961); 1 female, 23.XI.2000 (IBSP 160960); 1 female, 23.XI.2000 (IBSP 160959); 2 males, 14.IV.2002 (MCTP 30062); 1 female, 23.XI.2000 (MCTP 30063); 1 female, 02.I.2001 (MCTP 30064); all same locality and collector as holotype.</p> <p> <b>Other material examined:</b> BRAZIL. <i>Rio Grande do Sul</i>: 62 males, 39 females, CPCN Pró-Mata, São Francisco de Paula, 25.X.2000 – 18.V.2002, R. Ott leg. (MCN 47693–47734); 172 males, 23 females, same data above (MCTP 30118–30162); 13 males, 8 females same data above (IBSP 161009 – 161020).</p> <p> <b>Etymology.</b> The specific name is an adjective which in Brazilian slang means “small, less developed”.</p> <p> <b>Diagnosis.</b> Males can be recognized by the long and coiled embolus (Figs 1C, D; 6A, B). Females by a wider than long epigynal plate with T-shaped atrium. (Fig. 3F).</p> <p> <b>Description. Male</b> (<b>holotype</b>). Coloration as in <i>A. graudo</i>, but abdomen paler with brownish scutum and yellowish spinnerets. Total length 4.90. Carapace 2.10 long, 1.60 wide. Clypeus 0.10 high. Eye diameters and interdistances: AME 0.12, ALE 0.12, PME 0.10, PLE 0.12; AME–AME 0.04, AME–ALE touching, PME–PME 0.06, PME–PLE 0.06, ALE–PLE 0.04. Abdomen with anterodorsal scutum. Leg measurements: I – femur 1.90/ patella 1.20/ tibia 1.70/ metatarsus 1.50/ tarsus 0.80/ total 7.10/ II – 1.60/ 0.90/ 1.10/ 1.10/ 0.70/ 5.40; III – 1.50/ 0.60/ 0.90/ 1.10/ 0.60/ 4.70; IV – 1,70/ 0.70/ 1.20/ 1.70/ 0.70/ 6;00. Leg spination: femur I d0-1-1, p0-0-1, II d0-1-2, p0- 0-1, III d0-1-1, p0-0-1, r0-1-1, IV d0-1-1, p0-0-1, r0-0-1; patela III r1, IV r1, tibia II v0-1p-1p, III p1-1-0, r1-1-0, v1 p-2-2; IV p1-1-1, r1-1-1, v1 p-2-2, metatarsus I v1 v-0-0, II v1 r-0-0, III p1-1-1, r1-1-1-1, v0-2-0, IV p1-2-2, r1-2- 2, v2-2 -0. Embolus distally with large number of thorn-like processes (Figs 6A–C); small retrolateral triangular process at distal half of tibia (Fig. 3C).</p> <p> <b>Female</b> (<b>paratype MCN 47659</b>). Coloration as in male. Total length 5.10. Carapace 1.80 long, 1.50 wide. Clypeus 0.08 high. Eye diameters and interdistances: AME 0.10, ALE 0.10, PME 0.10, PLE 0.10; AME–AME 0.04, AME–ALE touching, PME–PME 0.06, PME–PLE 0.06, ALE–PLE 0.04. Abdomen dorsal scutum absent. Leg measurements: I – femur 1.60/ patella 0.90/ tibia 1.10/ metatarsus 1.00/ tarsus 0.70/ total 5.30/ II – 1.20/ 0.70/.00/ 0.80/ 0.60/ 4.30/ III – 1.30/ 0.60/ 0.70/ 0.90/ 0.50/ 4.00/ IV – 1.50/ 0.70/ 1.10/ 1.30/ 0.60/ 5.20. Leg spination: femur I d1-1-1p, II d1-1-0, III d1-1-2, IV d1-1-1r, tibia II v0-1p-1p, III-IV p1-1-0, r 1-1-10, v1p-2-2, metatarsus II v2 -0-0, III p1-1-2, r1-1-2; v0-2-0, IV p1-1-2, r1-1-2, v1 p-2-0. Pedipalp: femur I d1-1, p1, patella p1, tíbia p1, r1-1. Tarsus d1, p1-1, r1, with ventral tuft of setae. Epigynum wider than long, with wide hood and conspicuous slit-like openings “Y” shaped copulatory opening areas (Figs 3F, G). Rounded and contiguous spermathecae (Figs 3F, G); copulatory ducts coiled forming large rounded sections; fertilization ducts very short in posterior half of spermathecae (Fig. 3G).</p> <p> <b>Variation.</b> Males (72 specimens): total length 3.7–6.1; carapace 1.5–2.6; femora I 1.3–2.3. Females (10 specimens): total length 5.1–4.2; carapace 1.5–1.8; femora I 1.3–1.6.</p> <p> <b>Distribution.</b> Known only from the type locality in the state of Rio Grande do Sul, Brazil.</p>Published as part of <i>Ott, Ricardo & Brescovit, Antonio Domingos, 2012, Arauchemus, a new spider genus of the Echemus group (Araneae: Gnaphosidae: Echeminae) from Araucaria Forest areas in southern Brazil, with notes on habitat preferences and phenology, pp. 44-56 in Zootaxa 3339</i> on pages 49-54, DOI: <a href="http://zenodo.org/record/209775">10.5281/zenodo.209775</a>
Arauchemus graudo Ott & Brescovit, 2012, sp. nov.
No full textArauchemus graudo sp. nov. Figs 1 A, B; 2; 4; 5; 7 A; 8 A; 9 Type material. Holotype: male from CPCN Pró-Mata, Potreiro Velho, São Francisco de Paula, Rio Grande do Sul, Brazil, 07.IV. 2001, R. Ott leg. (MCN 47641). Paratypes: 1 male, 3 females, 07.IV. 2001 (MCN 47643); 1 female, 09.VIII. 2001 (MCN 47644); 2 females, 13.XI. 2001 (MCN 47645); 2 females, 14.IV. 2002 (MCN 47646); 2 males, 01.V. 2001 (MCN 47647); 2 males, 07.IV. 2001 (MCN 47648); 2 females, 25.XI. 2000 (MCN 47649); 1 females, 25.X. 2000 (MCN 47658); 1 male, 14.IV. 2002 (IBSP 160963); 1 male, 07.IV. 2001 (IBSP 160964); 1 female, data as holotype, 02.I. 2001 (IBSP 160965); 1 female, 02.I. 2001 (IBSP 160966); 2 males, 14.IV. 2002 (MCTP 30060); 2 females, 18.V. 2002 (MCTP 30061); all same locality and collector as holotype. Other material examined: BRAZIL. Rio Grande do Sul: 13 males, 10 females, CPCN Pró-Mata, São Francisco de Paula, 25.X. 2000 – 18.V. 2002, R. Ott leg. (MCN 47661 –47680); 51 males, 81 females, same data above (MCTP 8976–8981; 30069–30117); 12 males, 10 females, same data above (IBSP 161021 – 161032). Etymology. The specific name is an adjective which in Brazilian slang means “large, well developed”. Diagnosis. Males can be recognized by the short, curved and stout embolus (Figs. 1 A, B; 4 B, C). Females by the epigynal plate as long as wide with short posterior septum (Figs. 2 F–G). Description. Male (holotype). Carapace, chelicerae, endites, labium, sternum and legs orange-brown. Abdomen grayish with darker anterodorsal scutum; pale orange spinnerets. Total length 6.3. Carapace 2.7 long, 2.2 wide. Clypeus 0.12 high. Eye diameters and interdistances: AME 0.16, ALE 0.16, PME 0.14, PLE 0.16; AME–AME 0.04, AME–ALE touching, PME–PME 0.08, PME–PLE 0.08, ALE–PLE 0.06. Abdomen with oval anterior dorsal scutum. Leg measurements: I – femur 2.2 / patella 1.5 / tibia 2.1 / metatarsus 1.7 / tarsus 1.1 / total 8.6 / II – 1.9 / 1.2 / 1.5 / 1.4 / 1.0/ 7.0/ III – 1.8 / 1.0/ 1.3 / 1.4 / 0.8 / 6.3 / IV – 2.3 / 1.0/ 1.8 / 2.2 / 0.8 / 8.1. Leg spination: femur I d 1 - 1 -0, p0- 0-1, II d 1 - 1 -0, p0- 0-1, III d 1 - 1 - 1, p0- 0-1, r 1 - 1 - 1, IV d 0-1 - 1, p0- 0-1, r0- 0-1; patela III r 1, IV r 1, tibia I v 1 p- 1 p- 1 p, II v 0-2 - 1 p, III d 1 - 1 -0, p 1-2 - 1 - 1 - 1, r 1 - 1 - 1, v 2-3 - 3 - 2; IV d 1- 2 - 1 - 1, p 1 - 1 -0, r 1 - 1 -0, v 1 p- 3 - 2 - 2, metatarsus I v 0-2 -0, II v 0-2 -0, III d 0-2 - 2, p 2 - 2 - 1 - 1 - 1, r 1 - 1 - 1, v 2 - 2 -0, IV d 0-2 - 2, p 1 - 1 - 1 - 1, r 1 - 1-2 - 1 - 1-2, v 0-2 - 1-2. Palp with short, robust embolus with distal, small, thorn-like processes (Figs 4 A–C); small triangular process at dorsal base of retrolateral tibial apophysis (Fig. 2 C). Female (paratype MCN 47658). Coloration as in male. Total length 7.5. Carapace 4.8 long, 2.8 wide. Clypeus 0.12 high. Eye diameters and interdistances: AME 0.16, ALE 0.14, PME 0.14, PLE 0.14; AME–AME 0.04, AME–ALE touching, PME–PME 0.10, PME–PLE 0.08, ALE–PLE 0.06. Abdomen dorsal scutum absent. Leg measurements: I – femur 2.4 / patella 1.6 / tibia 1.8 / metatarsus 1.5 / tarsus 1.0/ total 8.30 / II – 2.3 / 1.5 / 1.6 / 1.6 / 1.0/ 8.0/ III – 1.8 / 1.0/ 1.1 / 1.6 / 0.8 / 6.3 / IV – 2.6 / 1.4 / 2.0/ 2.3 / 1.0/ 9.3. Leg spination: femur I d 1 - 1 -0, p 1 - 1 -0, II d 0-1 - 1, d 1 - 1 -0, III d 1 - 1-2, p 0-1 - 1, r 0-1 - 1, IV d 1 - 1 - 1, p0- 0-1, r0- 0-1, tibia I v 0-1 p-0, II v 0-2 - 1 p, III p 1 - 1 - 1, r 0-1 -0, 1p- 2 - 2, d 1 -0-0, IV p 1 - 1 -0, r 1-2 - 2, v 2 - 2 - 2, metatarsus I –II v 0-2 -0, III p 1-2 - 2, r 1 - 1-2; v 0-2 -0, IV p 1 - 1 - 1, r 2 - 2 - 2, v 2 - 2 -0. Pedipalp: femur I d 1 - 1, p 1, patella p 1, tíbia p 1, r 1 - 1, tarsus d 1, p 1 - 1, r 1. Epigynum with small anterior hood and short median posterior septum (Fig. 2 F). Rounded spermathecae separated from each other around 1 / 3 of their diameter (Fig. 2 F); copulatory ducts coiled forming large oval sections; fertilization ducts in anterior half of spermathecae (Fig. 2 G). Variation. Males (72 specimens): total length 4.5–7.6; carapace 1.9–3.2; femora I 1.7–2.9. Females (10 specimens): total length 6.2–7.7; carapace 2.4–3.8; femora I 1.8–2.4. Distribution. Known only from the type locality in the state of Rio Grande do Sul, Brazil.Published as part of Ott, Ricardo & Brescovit, Antonio Domingos, 2012, Arauchemus, a new spider genus of the Echemus group (Araneae: Gnaphosidae: Echeminae) from Araucaria Forest areas in southern Brazil, with notes on habitat preferences and phenology, pp. 44-56 in Zootaxa 3339 on pages 47-49, DOI: 10.5281/zenodo.20977
Johann Conrad Ott
No full textBeim Dargestellten handelt es sich um den Kaufmann und Zunftpfleger Hans Konrad Ott (1684-1752)R. Simler pinx. ; J.R. Holzhalb sculps.Es handelt sich um eine Radierung von Johann Rudolf Holzhalb vermutlich nach einer Vorzeichnung von Johann Heinrich Werdmüller. Letzterer hat die Zeichnung nach einem Porträt von Johann Rudolf Simmler gefertigt. Die Radierung steht in Zusammenhang mit Otts PorträtsammlungVgl. Icones Ottiorum, hrsg. von Hans Kaspar Ott, ca. 1790, Abb. 21 (Ex. mit 55 Druckgrafiken unter Sign. KK 592)Vgl. die Vorzeichnung von Johann Heinrich Werdmüller unter der Signatur der Zentralbibliothek Zürich, Graphische Sammlung und Fotoarchiv: Ott, Johann Konrad (b) I, 2 Pp A
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