190,072 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
Sample Selection Models in R: Package sampleSelection
Get PDFThis 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.
Negative Differential Conductivity in an Interacting Quantum Gas
Get PDFNegative 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]
Rhinocricus gauchus Rodrigues, Ott & Rodrigues, 2012, sp. nov.
No full textRhinocricus gauchus sp. nov. (Figs. 8–15) Types. Holotype male from São Francisco de Assis, Rio Grande do Sul, Brazil, 25.V. 2009, I. Heydrich leg. (MCN 613). Paratypes: three males and three females, same data as the holotype (MCN 736); one male, 25.IV. 2009, R. Ott leg. (MCTP 187); one male and one female, 21.VIII. 2009, R. Ott leg. (IBSP); one male and one female, 21.VIII. 2009, R. Ott leg. (MZUSP). Etymology. The epithet refers to a term used to designate people from the state of Rio Grande do Sul, a locality with a wide distribution of the species. Diagnosis. Rhinocricus gauchus is close to Rhinocricus cachoeirensis Schubart, 1944 by the shape of the anterior gonopod (Fig. 8), but differs from R. cachoeirensis by the sternite with straight apex and by the posterior gonopod with non-lamellate and distally rounded solenomere (Fig. 10). Description. Male, holotype (Figs. 11, 12). With 53 segments. Length 65. Width 6. Clypeus dark-olive with spaced 2 – 2 supra-labial setae. Labrum yellowish-brown with 11 – 11 setae. Antennae olive-brown, with numerous sensory cones (around 20). Collum olive-brown with yellowish and ventro-laterally rounded borders. Prozonites light olive-brown; metazonites dark-olive with yellowish borders. Epiproct olive-brown, distally yellowish, rounded and longer than paraproct. Paraproct brown. Hypoproct olive-brown. Legs brown, third and fourth coxae prolonged. Ocelli dark-brown, disposed in six rows, in the following numeric order (dorsal to ventral): 9, 9, 9, 7, 4, 1 right and 9, 9, 9, 7, 5, 1 left. Ozopores black, beginning in the sixth segment. Scobinae starting at seventh segment. Anterior gonopod (Figs. 8, 9). Sternite with wide base, distal portion short and straight, not surpassing the length of coxite and telepodite. Coxite wide, internal lobe not surpassing the telepodite, which presents a small distal lobe. Posterior gonopod (Fig. 10). With long solenomere, surpassing the length of the tibiotarsus which presents a rounded distal portion. Tibiotarsus lamellate, rounded externally and with fine internal prolongation. Female, paratype (Figs. 13–15). As the male unless noted. Length 70. Width 7. Labrum with 10 – 10 labral setae. Ocelli arranged in six rows in the following numeric order (dorsal to ventral): 8, 9, 8, 7, 6, 3 right and 9, 9, 9, 8, 6, 4 left. Scobinae less conspicuous than in male. Material examined. BRAZIL, Rio Grande do Sul: Derrubadas, one male, 30.X. 2003, R. Ott leg. (MCN 519); Montenegro, one male, 17.XI. 1977, M. H. Galileo leg. (MCN 112); one male, 31.VI. 1977, A. A. Lise leg. (MCN 041); one male and two females, 12.V. 1977, H. Bischoff leg. (MCN 076); one male, 23.XI. 1977, M. E. L. Souza leg. (MCN 114); seven males and five females, 19.X- 16.XI. 2001 (MCN 560); three males, one female and juvenile one, 24.VIII- 19.X. 2001, all R. Ott & A. Ott leg. (MCN 549); São Borja, one male, 8.XI. 1979, H. Bischoff leg. (MCN 149); São Francisco de Assis, one male, 8–13.III. 2010, Equipe Projeto Arenização leg. (MCN 616); two males, 27.XI. 2009, R. Ott leg. (MCN 617); Tenente Portela, one male, 10.IX. 1976, S. Scherer leg. (MCN 050); Triunfo, two males, 19.VI. 1977, H. Bischoff leg. (MCN 086); one male, 19.V. 1977, A. A. Lise leg. (MCN 067); one male, 15.IX. 1977, M. H. Galileo leg. (MCN 107). Note. General color of living specimens, dark-olive and metazonite borders yellow (Fig. 15) Distribution. Brazil (State of Rio Grande do Sul).Published as part of Rodrigues, Patrícia E. S., Ott, Ricardo & Rodrigues, Everton N. L., 2012, New species and new records of millipedes of the genus Rhinocricus Karsch, 1881 (Spirobolida: Rhinocricidae) from southern Brazil, pp. 55-64 in Zootaxa 3172 on pages 57-59, DOI: 10.5281/zenodo.21010
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
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
Drei-Minuten-Wissenschaft: Der „Apfel der Diskordia“
No full textDr. Michael R. Ott vom Sonderforschungsbereich 933 „Materiale Textkulturen“ erzählt in 3 Minuten, was es mit dem „Apfel der Diskordia“ auf sich hat
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