48,236 research outputs found
Crystal structures of five policyclic compounds related to the natural product forskolin
No full text(3alphabeta(Z),4beta,6aalpha,9abeta,9bbeta)-(+/-)-3a,4,6a,7,8,9,9a,9b-octahydro-4,7,7,9b-tetramethyl-3a-[3-(methoxymethylocy)-3-methyl-l-butenyl]-5H-naphto[1,8-de]-1,3-dioxin-6-one (I), C22H36O5, M(r) = 378.51, monoclinic, P2(1)/n, a = 6.330(1), b = 14.576(2), c = 22.837(2) angstrom, beta = 93.04(1)-degrees, V = 2104.1(2) angstrom3, Z = 4, D(c) = 1.19 Mg/m3, lambda(MoKalpha) = 0.71069 angstrom, mu = 0.8 cm-1, F(000) = 832, T = 298 K, R = 0.054 for 1971 observed reflections; (7abeta, 10aalpha, 10bbeta, 12a)-(+/-)-7a9,10,10a,10b,11,12,12a-octahydro-2,2,2,10,10,10b,12a-hexamethyl-2H,8H-1-benzopy-rano[4a,5,6,-de][1,32]-benzodioxin-11-one (II), C20H29O4, M(r) = 334.5, triclinic, P-1, a = 10.595(2), b = 12.152(1), c = 8.073(1) angstrom, alpha = 106.52(1), beta = 105.65(1), gamma = 66.29(1)-degrees, V = 897.9(2) angstrom3, Z = 2, D(c) = 1.24 Mg/m3, lambda(MoKalpha) = 0.71069 angstrom, mu = 0.8 cm-1, F(000) = 362, T = 298 K, R = 0.046 for 2848 observed reflections; (7abeta, 10aalpha, 10bbeta, 12alpha, 12aalpha)-(+/-)-7a,9,10,10a,10b,11,12,12a-octahydro-2,2,10,10,10b,12a-hexamethyl-2H,8H-1-benzopy-rano[4a,5,6-de][1,3,2]-benzodioxin-11,12-diol (III), C20H32O5 (two molecules in the asymmetric unit), M(r) = 352.2, triclinic, P-1, a = 12.948(3), b = 13.615(3), c = 12.197(4) angstrom, alpha = 101.16(2), beta = 111.88(2), gamma = 69.48(2)-degrees, V = 1863.8(9) angstrom3, Z = 2, D(c) = 1.26 Mg/m3, lambda(MoKalpha) = 0.71069 angstrom, mu = 0.8 cm-1, F(000) = 768, T = 298 K, R = 0.060 for 4570 observed reflections; 4-acetoxy-4-[[(4abeta,5alpha,8abeta)-(+/-)-hexahydro-4a,6,6-trimethyl-4H-1,3-benzodioxin-4-one]-5-yl]butan-2-one (IV), C17H26O6, M(r) = 326.4, monoclinic, P2(1)/c, a = 10.495(2), b = 12.050(2), c = 14.216(2) angstrom, beta = 108.51(1)-degrees, V = 1704.8(5) angstrom3, Z = 4, D(c) = 1.27 Mg/m3, lambda(MoKalpha) = 0.71069 angstrom, mu = 0.9 cm-1, F(000) = 704, T =298 K, R = 0.049 for 2455 observed reflections; (3aalpha,4beta,5beta,6beta,6aalpha,9abeta,9bbeta)-(+/-)-4,5-epoxy-decahydro-3,3a-dihydroxy-2-ethoxy-4,7,7,9b-tetramethyl-naphto-[1,8-bc]-pyran-6-ol-acetate (V), C20H32O7, M(r) = 383.5, monoclinic, C2/c, a = 10.353(2), b = 17.975(3), c = 21.188(3) angstrom, beta = 91.29(1)-degrees, V = 3942(1) angstrom3, Z = 8, D(c) = 1.29 Mg/m3, lambda(MoKalpha) = 0.71069 angstrom, mu = 0.8 cm-1, F(000) = 1664, T =298 K, R = 0.051 for 2120 observed reflections. We report here the complete structures of four decalin derivatives (compounds I, II, III, V) and one related compound (compound IV) synthetized in order to find an efficient synthetic approach for the natural product forskolin
Predicting chaos through an harmonic balance technique: an application to the time-delayed Chua's circuit
No full textIEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS: PART
Neobythites gilli Goode and Bean 1885
No full textNeobythites gilli Goode and Bean 1885 (Figs. 1–3) Neobythites gilli Goode and Bean 1885: 601 (type locality 28 ° 36 'N, 85 ° 33 'W). Neobythites gilli: Miranda Ribeiro 1915: 632 (holotype of N. ocellatus); Koike and Guedes 1981: 50 (material lost; identification doubtful); Nielsen 1999: 337 (all specimens of this species caught from outside the Gulf of Mexico seem to be incorrectly identified). Material examined. 178 specimens, SL 26–144 * mm. Holotype and 177 non-types: for catalog numbers and localities see Nielsen (1999: 337). Additional material: none. *Erroneously given as 59–229 in Nielsen (1999, tab. 2). Diagnosis. Neobythites gilli differs from all other Atlantic Neobythites species by the following combination of characters: two distinct ocelli in the dorsal fin with a centrally placed ocellus (snout to dark part of ocellus 41–49 % SL) and a 1 st posterior ocellus (snout to dark part of ocellus 59–67 % SL); very rarely a small, black spot anteriorly in the fin and one posterior to the second ocellus, 0–1 weak spine on hind margin of preopercle, total vertebrae 52–56, dorsal 88–97, and anal 73–81 fin rays. Similarity. It appears from Table 3 that N. gilli like N. ocellatus have two ocelli in the dorsal fin. In N. gilli they are placed as the central ocellus (snout to ocellus-spot 41–49 % SL) and 1 st posterior ocellus (snout to ocellus-spot 59–67 % SL) while in N. ocellatus they are placed as the anterior ocellus (snout to ocellus-spot 28–31 % SL) and central ocellus (snout to ocellus-spot 45–50 % SL). Neobythites gilli generally have fewer ocelli than N. multiocellatus and furthermore fewer vertebrae and rays in dorsal and anal fins than N. multiocellatus, N. monocellatus, and N. ocellatus. It also differs from N. monocellatus by having two ocelli (vs one). N. monocellatus N. monocellatus N. gilli MOVI 39139 HT + 69 PTs HT + 177 non-types range mean n range mean n Standard length (SL) 97 37–154 70 26–144 178 Meristic characters Dorsal fin rays 98 93–99 96.5 66 88–97 92.5 125 Caudal fin rays 8 8 8 62 8 8 75 Anal fin rays 82 78–83 80.4 67 73–81 76.8 133 Pectoral fin rays 25 24–27 25.7 50 23–25 24.2 48 Pseudobranchial filaments 5 4–6 4.6 61 3–6 4.2 49 Precaudal vertebrae 12 12–13 12.0 69 11–13 12.0 152 Total vertebrae 57 54–58 56.4 69 52–56 54.2 139 Origin of dorsal fin above vertebra n° 5 5–6 5.1 69 4–6 5.0 85 Origin of anal fin below dorsal fin ray n° 19 17–21 19.1 69 17–21 19.0 83 Origin of anal fin below vertebra n° 14 14–15 14.5 69 14–15 14.3 83 Long gill rakers on anterior arch 15 13–15 14.1 66 12–15 13.8 52 Morphometric characters in % SL Head length 22.5 21.0–24.0 22.2 69 20.5–25.5 22.7 83 Depth at anal fin origin 17.0 14.0– 19.5 17.1 66 15.0–19.0 17.0 92 Upper jaw length 11.0 10.5 –13.0 11.6 60 10.5–14.5 11.6 41 Horizontal eye window 5.5 4.9 –7.0 5.6 60 4.7–6.9 5.6 49 Preanal length 40.5 35.5 –44.0 39.9 66 38.5–45.5 41.9 43 Predorsal length 25.5 20.0–27.0 24.8 64 22.0– 27.5 25.4 54 From base of pelvic to anal fin 23.5 19.5 –27.0 23.4 63 19.5–26.5 23.9 32 Pelvic fin length 18.5 17.5–23.5 20.3 64 15.0– 22.5 19.5 55 Description. Table 1 shows the principal meristic and morphometric characters of the 178 specimens, including the holotype, taken from Nielsen (1999: 345). Since no additional specimens are examined reference is made to the description from 1999. For comparison reasons the sagittal otolith is shown in Figure 3. Only the “Ocelli” section of the original description is repeated here due to the present separation between spots and ocelli. Dorsal fin ocelli and spots: Figure 2 shows the two ocelli of which the central ocellus is larger than the 1 st posterior ocellus. Table 3 gives the position of the two ocelli. A black spot at the origin of the dorsal fin (snout to spot 27–31 % SL) is seen in eight specimens and also a spot posterior to the 1 st posterior ocellus (snout to spot 75–80 % SL) is found in eight specimens. Distribution. Known only from the Gulf of Mexico, at depths from 59 to 229 m. The distribution of the 178 specimens (from 44 stations) examined by Nielsen (1999: 337) is shown on Figure 1. Remarks. Koike and Guedes (1981) recorded a 140 mm Neobythites gilli caught in June 1967 in a reef area off Piedade, Pernambuco, at 10 m depth. Unfortunately, the specimen cannot be traced. The color description did not mention the presence of ocelli in the dorsal fin. The shallow depth and lack of ocelli make it very unlikely that the specimen was correctly identified.Published as part of Nielsen, Jørgen G., Uiblein, Franz & Mincarone, Michael M., 2009, Ocellus-bearing Neobythites species (Teleostei: Ophidiidae) from the West Atlantic with description of a new species, pp. 57-68 in Zootaxa 2228 on pages 59-61, DOI: 10.5281/zenodo.19024
Structure of 3-(p-chlorophenyl)-1-phenyl-1,3-propanedione enol
No full textAbstract: 1-(4-Chlorophenyl)-3-hydroxy-3-phenyl-2-propen-1-one, C15H11ClO2, M(r) = 258.7, C2/c, a = 24.324 (4), b = 6.537 (2), c = 15.598 (2) angstrom, beta = 93.52 (1)-degrees, V = 2475.5 (9) angstrom3, Z = 8, D(x) = 1.382 g cm-3, lambda(Mo Kalpha) = 0.71069 angstrom, mu = 2.95 cm-1, F(000) = 1072, T = 298 K, final R = 0.043 for 1192 observed reflections. The compound displays a strong intramolecular asymmetric hydrogen bond [O...O = 2.471 (4), O-H = 1.09 angstrom, IR nu(OH) stretching frequency = 2577 cm-1, H-1 NMR chemical shift of the enolic proton = 16.8 p.p.m.] which can be interpreted in terms of resonance-assisted hydrogen bonding. The proton localization, that is, the preference displayed by the proton for settling on an O atom of the beta-diketone fragment rather than on the other O atom, is discussed and related to the different environments of the two O atoms in the crystal packing and, in particular, to the asymmetry of their C-H...O short contacts
Environmental performances in Europe: An empirical analysis of the convergence among manufacturing sectors
No full textThis study focuses on the environmental performances of the European manufacturing industry. Our aim is to test the existence of both absolute and conditional β-convergence as well as σ-convergence in the environmental productivity (i.e., for each sector, the ratio between value added and carbon dioxide emissions) of fourteen sectors for the period 1995-2009 using data from the
WIOD database. The results s upport the hypothesis of β-convergence and highlight other factors such as trade openness. In
addition, the results indicate that the sectorial share of value added can affect sectorial environmental performances, as
shown by a higher speed of convergence. No statistical evidence of σ-convergence is found
Analysis of stability and bifurcations of limit cycles in Chua's circuit through the harmonic balance approach
No full textIEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS: PART
FIGURE 2. Neobythites gilli, 104 in Ocellus-bearing Neobythites species (Teleostei: Ophidiidae) from the West Atlantic with description of a new species
No full textFIGURE 2. Neobythites gilli, 104 mm SL, ZMUC P771224.Published as part of Nielsen, Jørgen G., Uiblein, Franz & Mincarone, Michael M., 2009, Ocellus-bearing Neobythites species (Teleostei: Ophidiidae) from the West Atlantic with description of a new species, pp. 57-68 in Zootaxa 2228 on page 62, DOI: 10.5281/zenodo.19024
G. M. Anselmi, G. Ruozzi (a cura di), Banchetti letterari: cibi, pietanze e ricette nella letteratura italiana da Dante a Camilleri, (Carocci, Roma, 2011)
No full textDiscordanze stratigrafiche al Monte Bruca
No full textLe Alpi Carniche vantano un patrimonio geologico che in ambito circum-mediterraneo costituisce
una vera punta di eccellenza. Caratteristica peculiare del Monte Bruca è quella di
conservare, racchiusa in meno di 50 m di spessore, una successione ridotta, formata dalle
sequenze ercinica (Fm. del Hochwipfel), tardo-ercinica (Fm. del Bombaso e Fm. di Meledis) e
post-ercinica o alpina (varie unità di età triassica medio-sup.
Bassogigas gilli Goode & Bean 1896
No full textBassogigas gilli Goode & Bean 1896 (Fig. 3F) Material examined. 11 specimens, 383–874 mm SL: MOVI 38587-38590 (4, 548– 874 mm), E-0526; MOVI 38593 (1, 820 mm), E-0509; MOVI 38594 (1, 675 mm), E-0544; MOVI 38595 (1, 847 mm), E-0501; MOVI 38596 (1, 697 mm), E-0527; MOVI 38640-38641 (2, 383– 521 mm), AG1-8; MOVI 38677 (1, 394 mm), AG1-1. Diagnosis. As for genus. Distribution. Western Atlantic, from 40°N and 23°S, southern Africa between Cape Town and Madagascar, and off New Caledonia (Nielsen et al. 1999), at depths from 637 to 2239 m. Remarks. Collected from several stations off Bahia, Espírito Santo, and Rio de Janeiro, at depths from 1158 to 2239 m (depth record). Previously reported in Brazilian waters to north of Vitória-Trindade Seamount Chain, at 637 m depth (Séret & Andreata 1992).Published as part of Mincarone, Michael M., Nielsen, Jørgen G., Costa, Paulo A. S. & Rv, Rv, 2008, Deep-sea ophidiiform fishes collected on the Brazilian continental slope, between 11 ° and 23 ° S, pp. 41-64 in Zootaxa 1770 (1) on page 49, DOI: 10.11646/zootaxa.1770.1.2, http://zenodo.org/record/512395
- …
