16,962 research outputs found
Hydraena (Hydraenopsis) kodadai Freitag & Jach, sp. n.
No full textHydraena (Hydraenopsis) kodadai Freitag & Jäch, sp. n. (Figs. 9, 21a–h) Type locality. Small stream in primary forest, ca. 100 m a.s.l., tributary of Cabayugan River, St. Paul Subterranean River National Park, Cabayugan district, 40 km NNE of Puerto Princesa City, central Palawan, Philippines. Type material. Holotype ɗ (NMW): “ Philippines, PALAWAN centr. smal stream in primary forest ca. 100 m, Cabayugan env., 2. 12. 1995, Ján Kodada lgt.”, terminal parts of abdomen and aedeagus glued separately. Paratypes: 2 ΨΨ (1 ex. NMW, 1 ex. UPLB): same locality data as holotype; 1 ɗ (NMW), 4 ΨΨ (NMW): “ Philippines, PALAWAN centr., Ulangoan river, 18 km NE San Rafael 6.XII. 1995, J. Kodada & B. Rigová lgt.”; 2 ΨΨ (NMW, 1 ex. mutilated): “ PHIL.: Palawan, P. Princesa Sabang, Waterfall (upper, 30m asl) 10 ° 13 'N 118 ° 53 ' E 26.3. 1995, leg. Freitag (19 a)”; 1 ɗ (UPLB): “ PHIL.: Palawan, P. Princesa Panaguman R. 10 ° 15.150 'N 118 ° 58.051 ' E 17.5. 2001, leg. Freitag (i 25)”; 1 ɗ (NMW, mutilated), 1 Ψ (NMW): “ PHIL.: Palawan, P. Princesa Panaguman R. 10 ° 15.150 'N 118 ° 58.051 ' E 17.5. 2001, leg. Freitag (e 18)”; 1 ɗ (NMW): “ PHIL.: Palawan, P. Princesa Panaguman R. 10 ° 15.150 'N 118 ° 58.051 ' E 17.5. 2001, leg. Freitag (e 26)”; 1 ɗ (WPU): “ PHIL.: Palawan, P. Princesa Panaguman R. 10 ° 15.150 'N 118 ° 58.051 ' E 17.5. 2001, leg. Freitag (e 29)”; 1 ɗ (NMW): “ PHIL.: Palawan, P. Princesa Panaguman R.PR1, 1.Drift 10 ° 15 '09''N 118 ° 58 '03''E 17.V. 2001, leg. Freitag (a 48)”; 1 Ψ (NMW): “ PHIL.: Palawan, P. Princesa Panaguman R.PR1, 1.Drift 10 ° 15 '09''N 118 ° 58 '03''E 17.V. 2001, leg. Freitag (a 49)”; 1 ɗ (NMW): “ PHIL.: Palawan, P. Princesa SSW Maratarpi Cabayugan R 1 10 °09' 46 ’’N 118 ° 49 ' 29 ’’ E 11.12. 2000, leg. Freitag (a 7)”; 1 Ψ (WPU, mutilated): “ PHIL.: Palawan, P. Princesa SSW Martarpi Cabayugan R. 1 10 °09' 46 ''N 118 ° 49 ' 29 '' E 11.12. 2000, leg. Freitag (9)”; 1 ɗ, 1 Ψ (NMW): “ PHIL.: Palawan, P. Princesa SSW Maratarpi Cabayugan R 1 10 °09' 46 ’’N 118 ° 49 ' 29 ’’ E 17.6. 2001, leg. Freitag (e 10)”; 1 ɗ (IRML; aedeagus mutilated): “ PHIL.: Palawan, P. Princesa SSW Martarpi Cabayugan R.1, 10°09' 46 ''N 118 ° 49 ' 29 ''E 1.VII. 2001, leg. Freitag (a 46)E”; 1 Ψ (NMW): “ PHIL.: Palawan, Taytay; 1 / 3 way highway to Lake Manguao, Manguao Stream trib., prim.forest c. 35m asl, 10 ° 47 'N 119 ° 31 ' E 29.4. 1995, leg. Freitag (13 b)M”; 1 Ψ (IRML) “ PHIL.: Palawan, P. Princesa SSW Maratarpi Cabayugan R 1 10 °09' 46 ’’N 118 ° 49 ' 29 ’’ E 16.11. 2000, leg. Freitag (e 12)”. Description. Body 1.30–1.45 mm long. Habitus as in Fig. 9. Entire body reddish brown, sometimes goldbrown; frons slightly darker brown, legs and maxillary palpi slightly paler. Pronotum wider than long, broadest at about posterior 0.3, entire pronotum moderately densely punctate; punctures small and shallowly (posteriorly moderately deeply) impressed, interstices glabrous; foveae hardly perceptible, or absent; lateral margins anteriorly convergent, distinctly sinuously convergent to rectangular posterior angles, forming an almost rectangular pronoto-elytral angle; lateral rim denticulate; anterior margins concave, distinctly broader than straight posterior margin; lateral hypomeron approximately as broad as profemur, inner margin (hypomeral carina) slightly biconvex; mesal hypomeron narrow, imperceptible. Elytra elongately oval, apex with tiny excision next to sutural keel, with ca. 12 longitudinal, not very regular, unimpressed rows of punctures (seven between suture and shoulder); punctures small and shallowly (basally moderately deeply) impressed, sparsely arranged; interstices and intervals flat, glabrous; lateral gutter of elytra widely explanate, not reaching elytral apex; elytral rim posteriorly finely denticulate; pseudepipleuron anteriorly about as broad as metafemur, reaching posterior 0.2, with indistinct foveae and one inconspicuous row of punctures; epipleuron narrow, short, inconspicuous. Mesoventrite with well developed longitudinal ridges; meso- and metaventrite, pubescent; abdominal ventrites sparsely pubescent; mesoventral intercoxal process moderately long, very wide; metaventral disc deeply impressed; metaventral plaques distinct, widely separated (wider than inflexed lateral portion of elytra), narrow, glabrous; intercoxal sternite large, approximately as broad as metafemora and as long as broad. Femora with inner margin straight to concave, outer margin conspicuously convex. Aedeagus (Figs. 21 a–c) slender, gently evenly curved ventrad and dextrad, with one dorsal subapical seta; dorso-ventrally flattened apically, appearing almost symmetric (ventral/dorsal view); phallobase asymmetric. Distal lobe not clearly delimited from main piece, median portion weakly sclerotized. Parameres articulately connected with main piece, moderately long; each paramere with a row of about 10 moderately long setae; left paramere inserted at about basal 0.50, right paramere at basal 0.55 of aedeagus. Gonocoxite (Fig. 21 e) subsemioval; apical area of ventral plate almost as long as basal area; subapical tufts curved; apical margin of basal area with median projection; condyles very small; dorsal plate very simple, slightly surpassing outer plate basally, without cavea. Spermatheca (Figs. 21 g–f). Proximal portion extremely large, strongly curved; distal portion discoidal. Secondary sexual characters. Male usually slightly larger than female. Meso- and metatibia in male slightly curved. Male profemur with (rather inconspicuous) ventro-basal ledge. Male terminal sternite (Fig. 21 d) oblongly subhexagonal, apical margin rather straight, base broad, distinctly produced into lateral appendages; spiculum gastrale about twice as long as terminal sternite, almost straight. Male tergite X distinctly excised apically. Female tergite X (Fig. 21 h) subsemicircular, with rather few long discal trichoid setae; subapical fringe with moderately long trichoid setae; hyaline apical margin entire. Differential Diagnosis. Hydraena kodadai resembles H. zetteli in size, colour and general habitus. Externally, H. kodadai can be distinguished from the latter by its narrower explanate elytral gutter, which ends near apical 0.2 of elytra. Furthermore, H. kodadai can easily be recognized by its posteriorly distinctly convergent pronotum, number of elytral striae (usually 12) and its broad, subsymmetric, bilobed and dorso-ventrally flattened aedeagus, and by its extremely large spermatheca. Distribution (Fig. 31). Hydraena kodadai is known from four small stream systems in central Palawan. Ecology. All known macro-habitats are rather undisturbed streams (first to fourth order) surrounded by forest, however, with a remarkable variation in physicochemical conditions. PR 1: acidic pH (6.32–7.02), low electrical conductivity (84 µS/cm on average), CR 1: alkaline water (pH 8.07–8.45), high conductivity (435 µS/cm on average) due to ultra-basic subsoils (Freitag 2004). Besides numerous specimens trapped in drift nets, some were collected repeatedly in gravel substrates under a small fall and in moderately fast flowing sections. Obviously, this species prefers (or at least tolerates) higher velocity. However, it was collected several times by emergence traps positioned over a pool section as well. Etymology. Named for Dr. Ján Kodada (Comenius University, Bratislava, Slovakia), excellent water beetle specialist, who considerably contributed to the knowledge of the fauna of Palawan.Published as part of Freitag, Hendrik & Jäch, Manfred A., 2007, Revision of the species of Hydraena Kugelann (Coleoptera: Hydraenidae) from Palawan and Busuanga, with descriptions of eleven new species, and redescription of Hydraena (Hydraenopsis) scabra d'Orchymont, 1925, pp. 1-44 in Zootaxa 1431 on pages 24-26, DOI: 10.5281/zenodo.17579
A novel approach to measure brain-to-brain spatial and temporal alignment during positive empathy
No full textToppi J, Siniatchkin M, Vogel P, Freitag CM, Astolfi L, Ciaramidaro A. A novel approach to measure brain-to-brain spatial and temporal alignment during positive empathy. Scientific reports. 2022;12(1): 17282.Empathy is defined as the ability to vicariously experience others' suffering (vicarious pain) or feeling their joy (vicarious reward). While most neuroimaging studies have focused on vicarious pain and describe similar neural responses during the observed and the personal negative affective involvement, only initial evidence has been reported for the neural responses to others' rewards and positive empathy. Here, we propose a novel approach, based on the simultaneous recording of multi-subject EEG signals and exploiting the wavelet coherence decomposition to measure the temporal alignment between ERPs in a dyad of interacting subjects. We used the Third-Party Punishment (TPP) paradigm to elicit the personal and vicarious experiences. During a positive experience, we observed the simultaneous presence in both agents of the Late Positive Potential (LPP), an ERP component related to emotion processing, as well as the existence of an inter-subject ERPs synchronization in the related time window. Moreover, the amplitude of the LPP synchronization was modulated by the presence of a human-agent. Finally, the localized brain circuits subtending the ERP-synchronization correspond to key-regions of personal and vicarious reward. Our findings suggest that the temporal and spatial ERPs alignment might be a novel and direct proxy measure of empathy. © 2022. The Author(s)
The politics and economics of regulatory impact assessment
No full textThis is the author accepted manuscript. The final version is available from the publisher via the link in this record
Cucurbit[7]uril host-vologen guest complexes: electrochromic and photochemical properties
No full textIn this thesis, we demonstrated that a molecular host, cucurbit[7]uril, provides an
alternative method of adsorbing molecules on semiconductors and shields the guest from
the hetereogenous interface. These novel hybrid systems exhibited photophysical and
electrochemical properties that differ from the properties of layers obtained by directly
attaching the chromophore to the semiconductor through binding groups.This thesis describes the host-guest chemistry between cucurbit[7]uril (CB[7]) and
various series of viologen guests. Methylviologen (1,1'-dimethyl-4,4'-bipyridinium dichloride, MV2+), 1-methyl-1'-p-tolyl-4,4'-bipyridinium dichloride (MTV2+), and 1,1'-dip-tolyl-(4,4'-bipyridine)-1,1'-diium dichloride (DTV2+) were encapsulated in the macrocyclic host cucurbit[7]uril, CB[7]. The complexes MV2+@CB[7] and MTV2+@CB[7] were physisorbed to the surface of
TiO2 nanoparticle films. The complexation into CB[7] was monitored by 1H NMR. TiO2 films functionalized with the complexes were studied by FT-IR-ATR and UV-Vis absorption. The electrochemical and spectroelectrochemical properties of MV2+@CB[7]
and MTV2+@CB[7] were studied in solution and in electrochromic windows (ECDs),
where the complexes were bound to TiO2 films cast on FTO. The ECDs prepared from MV2+@CB[7]/TiO2/FTO and MTV2+@CB[7]/TiO2/FTO electrodes showed reversible, sharp and fast color switching upon application of -0.8 V. Viologen derivative DTV2+ exhibited enhanced fluorescence upon encapsulation.
Aqueous solutions of DTV2+ were weakly fluorescent (Φ = 0.02, τ < 20 ps), whereas the
emission of the DTV2+@2CB[7] complex was enhanced by one order of magnitude (Φ =
0.29, τ = 0.7 ns) and was blue-shifted by 35 nm. DTV2+ in polymethylmethacrylate
(PMMA) matrix was fluorescent with a spectrum similar to that observed for the complex
in solution. DFT and CIS calculations suggested that the increased planarity of the
aromatic rings and a quinonoid structure of the S1 state, induced by encapsulation in the
host, can explain the observed emission enhancement. The absorption and emission
spectra of DTV2+@2CB[7] in water exhibited a large Stokes shift (ΔSt ~ 10,000 cm-1) and no fine structure. 1H NMR and UV-Vis titration indicated that the DTV2+@2CB[7] complex is formed in aqueous solutions with a complexation constant of K1W = 1.2×104 M-1, K2W = 1.0×104 M-1 in water, and K1NaCl = 1.1×104 M-1, K2NaCl = 0.8×104 M-1in 0.05 M
NaCl aqueous solution.Ph. D.Includes bibliographical referencesIncludes vitaby Marina Freita
Phase Distribution Efficiency of cm-Scale Ultrasonically Powered Receivers
No full textIn the domain of ultrasonically powered biomedical implants, there is an increasing interest in cm-scale ultrasonic receivers (RX). However, when a single-element transducer is used as the RX transducer, an uneven phase distribution across the RX area can significantly reduce the harvestable power. In this paper, we investigate the impact of lateral and angular misalignment on the acoustic field phase distribution across the RX surface. We show that, for a single-element RX transducer, lateral misalignment has minimal effect on the harvestable power, whereas even small angular misalignments can cause a considerable reduction, especially for larger RX sizes. We present a potential solution that consists of subdividing a large RX transducer (e.g. 20 × 20mm2) into smaller elements, which significantly improves power transfer efficiency by taking advantage of the smaller phase variation across the surface of each element. The trade-offs between achieving a minimum acceptable power transfer efficiency and managing the increased complexity in packaging and matching circuitry are also discussed.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic Components, Technology and MaterialsBio-Electronic
Highly efficient laser-driven Compton gamma-ray source
No full textThe recent advancement of high-intensity lasers has made all-optical Compton scattering become a promising way to produce ultrashort brilliant gamma-rays in an ultra-compact system. However, so far achieved Compton gamma-ray sources are limited by low conversion efficiency and spectral intensity. Here we present a highly efficient gamma photon emitter obtained by irradiating a high-intensity laser pulse on a miniature plasma device consisting of a plasma lens and a plasma mirror. This concept exploits strong spatiotemporal laser-shaping process and high-charge electron acceleration process in the plasma lens, as well as an efficient nonlinear Compton scattering process enabled by the plasma mirror. Our full three-dimensional particle-in-cell simulations demonstrate that in this novel scheme, brilliant gamma-rays with very high conversion efficiency (higher than 10(-2)) and spectral intensity (similar to 10(9) photons/0.1%BW) can be achieved by employing currently available petawatt-class lasers with intensity of 10(21) W cm(-2). Such efficient and intense gamma-ray sources would find applications in wide-ranging areas. ©2019 The Author(s)
100km-scale isotopic (d18O, dD) variability of the top-meter between B31 and Kohnen, Dronning Maud Land (M samples)
No full textIsotopic composition of the top-meter of the snowpack along a 115km traverse between B31 and D50, near Kohnen station, Dronning-Maud Land, East-Antarctica. Site D2 refers to the firn core drilling site B31. At each sampling site, profiles were sampled at 10 m distance in 90 m long trenches:
_R samples using the dual-tube sampling technique (Dallmayr et al., 2020), 3 subsections of the top-1m were sampled and at sites C4, C5, D2, D7, D24, D38, the top-1m of the trenches were sampled with the dual-tube and 5 single liners were taken and subsampled to 1 - 3 cm resolution (Hirsch, Nora; Hörhold, Maria; Dallmayr, Remi; Laepple, Thomas; Freitag, Johannes; Meyer, Hanno; Weiner, Mikaela (2023): Stable water isotopologues of arrays of high resolution 1 m snow cores from across Dronning Maud Land, East Antarctic Plateau [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.956273)
_M samples: Mixed 4 subsections of the top-1.2m of the 90m long trenches excavated by Pistenbully.
All isotopic analysis were realized by CRDS (Cavity-Ring-Down Spectroscopy) measurements at the Alfred-Wegener-Institut Helmholtz-Zentrum für Polar-und Meeresforschung in Bremerhaven (instrument models L-2120-i, L-2140-i, Picarro Inc.). The samples were shipped frozen to the Alfred-Wegener-Institut and stored at -25°C. Prior to measurements the samples were melted in the sample bags at room temperature. The measurement set-up followed the Van-Geldern Protocol. Each sample was injected four times and the standard deviation is computed
100km-scale isotopic (d18O, dD) variability of the top-meter between B31 and Kohnen, Dronning Maud Land (R samples)
No full textIsotopic composition of the top-meter of the snowpack along a 115km traverse between B31 and D50, near Kohnen station, Dronning-Maud Land, East-Antarctica. Site D2 refers to the firn core drilling site B31. At each sampling site, profiles were sampled at 10 m distance in 90 m long trenches:
_R samples using the dual-tube sampling technique (Dallmayr et al., 2020), 3 subsections of the top-1m were sampled and at sites C4, C5, D2, D7, D24, D38, the top-1m of the trenches were sampled with the dual-tube and 5 single liners were taken and subsampled to 1 - 3 cm resolution (Hirsch, Nora; Hörhold, Maria; Dallmayr, Remi; Laepple, Thomas; Freitag, Johannes; Meyer, Hanno; Weiner, Mikaela (2023): Stable water isotopologues of arrays of high resolution 1 m snow cores from across Dronning Maud Land, East Antarctic Plateau [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.956273)
_M samples: Mixed 4 subsections of the top-1.2m of the 90m long trenches excavated by Pistenbully.
All isotopic analysis were realized by CRDS (Cavity-Ring-Down Spectroscopy) measurements at the Alfred-Wegener-Institut Helmholtz-Zentrum für Polar-und Meeresforschung in Bremerhaven (instrument models L-2120-i, L-2140-i, Picarro Inc.). The samples were shipped frozen to the Alfred-Wegener-Institut and stored at -25°C. Prior to measurements the samples were melted in the sample bags at room temperature. The measurement set-up followed the Van-Geldern Protocol. Each sample was injected four times and the standard deviation is computed
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