70,818 research outputs found
Evidence for erbium-erbium energy migration in erbium(III) bis(perfluoro-p-tolyl)phosphinate
No full textCopyright 2008 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. This article appeared in Applied Physics Letters 92, 103303 (2008) and may be found at
Additions to the moss flora of Endau Rompin National Park, Johore State, peninsular Malaysia
No full textIn a recent survey of the Endau Rompin National Park (ERNP) in Johore State, 81 species and 4 varieties of mosses were documented. This increases the previous count from 62 species and 3 varieties of mosses in ERNP to 111 species and 5 varieties in total. Of these, 30 species are new records for Johore State. Rhaphidostichum bunodicarpum and Trichosteleum stigmosum are two species new to Peninsular Malaysia. Thuidium assimile is a new record for West Malesia. A new combination, Papillidiopsis aquaticum (Dix.) Boon-Chuan Ho & B.C. Tan is proposed. In terms of species composition, the pan-tropical families of Calymperaceae, Fissidentaceae, Leucobryaceae and Sematophyllaceae predominate the moss flora of ERNP
¿Por qué aún no hay vacuna contra la hepatitis C y es tan importante desarrollarla?
No full textArtículo de divulgación publicado en The Conversation España el día 19/11/2023.Aunque hay un tratamiento efectivo para curar la hepatitis C, el 80 % de los infectados no saben que la tienen y lo pueden transmitir a otras personas. La creación de la vacuna ayudaría decisivamente a erradicar por fin la enfermedad. Según la Organización Mundial de la Salud (OMS), 58 millones de personas padecen una infección crónica por el virus de la hepatitis C (VHC) en todo el mundo, y cada año se producen 1,5 millones de nuevas infecciones. El VHC, que ataca principalmente al hígado, puede desencadenar tanto infecciones agudas como crónicas. Aproximadamente un 70 % de las personas infectadas con este agente patógeno desarrollan una hepatitis C crónica.N
Cycloptiloides bimaculatus Tan, Japir & Chung 2021
No full textCycloptiloides bimaculatus Tan, Japir & Chung, 2021 (Figs 1A, 2) Cycloptiloides bimaculata Tan et al., 2021: 410 Cycloptiloides bimaculatus — Tan et al. 2022b: 600 Specimen examined. Holotype: EAST MALAYSIA • ♂; Sabah State, Sandakan, Sepilok, Rainforest Discovery Centre; N5.87580, E117.94299, 39.1± 5.4 m.a.s.l.; 9 January 2019, 19h11; on the leaf litter; coll. M.K. Tan, R. Japir, M. Binti & J.L. Yukang; SDK.19.20 (FRC) Additional specimens examined. EAST MALAYSIA • 1♂; Sabah State, Sandakan, Sepilok, Rainforest Discovery Centre; N5.87554, E117.94135, 54.5± 6.1 m.a.s.l.; 11 May 2022, 20h58; on the leaf litter; coll. M.K. Tan & T. Robillard; SBH.22.19 (FRC) • 1♂; Sabah State, Sandakan, Sepilok, Rainforest Discovery Centre; N5.87416, E117.93786, 89.2± 6.8 m.a.s.l.; 18 May 2022, 20h07; on the leaf litter; coll. M.K. Tan & T. Robillard; SBH.22.152 (MNHN) • 1♂; Sabah State, Sandakan, Sepilok, Rainforest Discovery Centre; N5.87328, E117.93749, 95.1± 5.6 m.a.s.l.; 18 May 2022, 20h57; on the leaf litter; coll. M.K. Tan & T. Robillard; SBH.22.153 (FRC) • 1♂; Sabah State, Sepagaya Waterfall, near Lahad Datu; N4.98354, E118.14498, 182.4± 7.4 m.a.s.l.; 13 May 2022, 11h39; on the leaf litter; coll. M.K. Tan & T. Robillard; SBH.22.50 (ZRC) • 1♂, 1♀; Sabah State, Mount Silam, lowland forest; N4.97589, E118.19060, 341 m.a.s.l.; 13 May 2022, 20h; on the leaf litter; coll. M.K. Tan & T. Robillard; TR22-10 (MNHN) Distribution. Borneo, Sabah State: Sepilok, Mount Silam [new locality record], Sepagaya near Lahad Datu [new locality record] Type locality. EAST MALAYSIA, Sabah State, Sepilok Calling song (1 ♂, in captivity, 26.4°C) (Fig. 2). The calling song generally consists of a sequence of echemes which can be highly variable in duration (8–26 s). The echeme sequence typically begins with the echemes more erratic in terms of number of syllables, syllable durations and intervals. Each echeme is made up of 4–10 syllables (= pulses), and has an average duration of 140.9±65.3 ms (78.0–249.1 ms). Consecutive echemes have an average interval of 371.6±86.3 ms (285.6–474.3 ms). The average syllable duration is 14.1±1.5 ms (11.9–15.6 ms) and the average interval between consecutive syllables is 7.2±1.6 ms (5.4–9.7 ms). The dominant frequency is 8.34 kHz. Compared to the continuous trill of Cycloptiloides timah Ingrisch, 2006 from Singapore (see Tan et al., under review), the calling song of C. bimaculatus also differs by a distinctly shorter syllable duration (14.1 ms in C. bimaculatus vs. 25.7 ms in C. timah) and by the intervals between consecutive syllables (7.2 ms vs. 104.5 ms). The dominant frequency is also distinctly lower (8.3 kHz vs. 9.1 kHz). It should be noted that the average temperature of the recordings for the two species are different (26.5°C in C. bimaculatus vs. 30.5°C in C. timah), which may have contributed partly to the differences in the call parameters between the two species.Published as part of Tan, Ming Kai, Japir, Razy, Chung, Arthur Y. C., Wahab, Rodzay Bin Haji Abdul & Robillard, Tony, 2022, Taxonomy and bioacoustics of scaly crickets (Orthoptera, Mogoplistidae Mogoplistinae) from Borneo and Singapore, pp. 177-189 in Zootaxa 5213 (2) on pages 178-181, DOI: 10.11646/zootaxa.5213.2.6, http://zenodo.org/record/735437
Varitrella (Cantotrella) suikei Tan, Japir & Chung 2020
No full textVaritrella (Cantotrella) suikei Tan, Japir & Chung, 2020 (Figs 15, 16) Varitrella (Cantotrella) suikei – Tan et al., 2020: 264 Material examined. Holotype: EAST MALAYSIA • ♂; Sabah State, Sandakan, Sepilok, Kabili Sepilok Forest Reserve; N5.86985, E117.93805, 69.8± 7.7 m.a.s.l.; 1 October 2019; on a foliage; coll. M.K. Tan, R. Japir & J. Lee Yukang; SDK.19.78 (FRC) Other material examined: EAST MALAYSIA • 1♂; Sabah State, Sandakan, Sepilok, Rainforest Discovery Centre; N5.87435, E117.94205, 49.9± 5.7 m.a.s.l.; 17 May 2022, 20h17; among the branch and foliage, feeding on the fruits of Leea; coll. M.K. Tan & T. Robillard; SBH.22.132 (MNHN) Remarks. This represents the second specimen for this species, having been previously described by a single holotype. The male resembles the holotype but we also illustrated the spermatophore (Fig. 15C). Ecology. The recently collected specimen was observed to feed on the fruits of Leea, but it probably also fed on the flowers and leaves of this common plant at the Rainforest Discovery Centre (Fig. 16). Distribution. Known only from the type locality, Sepilok (Borneo, Sabah State). Calling song. The calling song of the holotype was described in Tan et al. (2020). The call structure and call parameters of Varitrella (Cantotrella) suikei are distinct from those of Varitrella (Cantotrella) tabin sp. nov.: the former consists of irregular trill instead of well-defined echeme-sequences (even though each echeme is made up of two syllables). The echeme and syllable durations of Varitrella (Cantotrella) suikei are shorter in duration; and the dominant frequency is slightly higher.Published as part of Tan, Ming Kai, Japir, Razy, Chung, Arthur Y. C. & Robillard, Tony, 2022, New taxa and notes on bark and bush crickets (Orthoptera, Grylloidea, Gryllidae Landrevinae and Podoscirtinae) from Sabah, pp. 201-228 in Zootaxa 5178 (3) on pages 221-223, DOI: 10.11646/zootaxa.5178.3.1, http://zenodo.org/record/702615
Ectatoderus nigrofasciatus Tan & Wahab 2021
No full textEctatoderus nigrofasciatus Tan & Wahab, 2021 (Fig. 3) Ectatoderus nigrofasciatus Tan et al., 2021: 412 Ectatoderus nigrofasciatus — Tan et al. 2022b: 600 Ectatoderus sp. — Tan & Wahab 2018: 132 Specimen examined. Holotype: BRUNEI DARUSSALAM • ♂; Belait District, Jalan Labi near Andulau Forest Reserve, N4.63354, E114.51047, 76.6±5.0 m.a.s.l.; 7 July 2019, 20h42; on rattan foliage; coll. M.K. Tan; BRU.19.70 (UBDM) Additional specimens examined. BRUNEI DARUSSALAM • 1♂; Temburong District, Kuala Belalong Field Studies Centre, along Sungei Mata Ikan, N4.54742, E115.15715, 73.8± 27.9 m.a.s.l.; 22 September 2016, 22h33; on a foliage of a tree after rain; coll. M.K. Tan; KB.16.4 (ZRC) • 1♂; Temburong District, Kuala Belalong Field Studies Centre, along Sungei Mata Ikan, N4.54733, E115.15720, 113.4± 14.2 m.a.s.l.; 23 September 2016, 19h00; on a foliage of a tree after rain; coll. M.K. Tan; KB.16.15 (ZRC) Remarks. When Ectatoderus nigrofasciatus Tan et al., 2021 was first described, the basal part of the male genitalia of the holotype was not examined (Tan et al., 2021: Fig. 7). The apical part of the male genitalia, previously thought to be the complete genitalia, was considered to resemble that of Ectatoderus argentatus Ingrisch, 2006 from Thailand. However, after examining more specimens collected from Brunei Darussalam, it was found that the basal half of the male genitalia of E. nigrofasciatus has in fact the medial valve curved to a spiral. This character is more similar to that in Ectatoderus angusticollis Chopard, 1969 from Singapore (Fig. 3). Below, the diagnosis is revised accordingly. Revised diagnosis. The species is characterised by the scapus being dorsally black, but ventrally and laterally brown, and the antennae being entirely black basally; the head has a distinct black band behind eyes; and the male phallic complex is very large and forming a spiral. The new species is most similar and closest in distribution to E. angusticollis. In both species, the pronotum is more strongly widening toward apex, and the TIs and TIIs are provided with black dorsal stripes. The male phallic complex is very similar to that of E. angusticollis, including the spiral-shaped medial valve and the shape of the ventro-external sclerite. The species differs from E. angusticollis by the male phallic complex being exceptionally larger despite of having very similar body size (Fig. 3); the scapus and antennae being black (instead of testaceous); and the head being provided with distinct black and white bands behind eyes. The new species is also similar to E. argentatus having the pronotum strongly widening apically and the frons dark; it differs by the scapus and basal antennal segments being darkened instead of yellowish brown, and by the male phallic complex forming a spiral at base instead of being merely curved. Distribution. Borneo, BRUNEI DARUSSALAM: Belait and Temburong [new locality record] Districts Type locality. BRUNEI DARUSSALAM, Belait District, near Andulau Forest ReservePublished as part of Tan, Ming Kai, Japir, Razy, Chung, Arthur Y. C., Wahab, Rodzay Bin Haji Abdul & Robillard, Tony, 2022, Taxonomy and bioacoustics of scaly crickets (Orthoptera, Mogoplistidae Mogoplistinae) from Borneo and Singapore, pp. 177-189 in Zootaxa 5213 (2) on pages 181-182, DOI: 10.11646/zootaxa.5213.2.6, http://zenodo.org/record/735437
Cananguchales y manglares: humedales forestales de las zonas bajas tropicales, tan semejantes como contrastantes
No full textA pesar de la marcada diferencia existente entre cananguchales y manglares, dada la influencia marina sobre éstos últimos, se identificaron semejanzas a partir del análisis de datos de vegetación, tomados en parcelas de 1000 m2, y de análisis de correspondencia canónica. Factores ambientales restrictivos tales como, el drenaje, la inundación, y la profundidad del horizonte orgánico, influyeron en la estructura y diversidad de la vegetación en ambos bosques. La diversidad se incrementó con la disminución progresiva de las condiciones de estrés asociada a estos factores, a lo largo del gradiente ambiental, desde suelos arcillosos muy mal drenados, en basines y depresiones mal drenados, hasta diques y partes altas y bien drenadas del plano de la inundación, donde colonizan especies de los bosques vecinos. Los cambios climáticos post-glaciales establecidos con base en el análisis palinológico de columnas de sedimentos, evidenciaron la colonización progresiva de las especies dominantes, pero las condiciones del máximo térmico Holocénico posibilitaron el establecimiento y expansión de cananguchales y, con la estabilización de los niveles del mar, de los manglares 4000 años AP. Análisis de imágenes satelitales, observaciones fenológicas y series de tiempo de variables climáticas mostraron que Rhizophora mangle y Mauritia flexuosa han respondido positivamente a las sequías de corta duración asociadas al ENSO (El Niño Southern Oscillation). Eventos, como el mar de leva en los manglares, han incidido en las tasas de mortalidad, reclutamiento y sobrevivencia de la regeneración natural. Los mayores cambios de la vegetación en las últimas décadas se asociaron principalmente con perturbación de origen antrópico. © 2018. Acad. Colomb. Cienc. Ex. Fis. Nat.</jats:p
Monseremus bellus Tan & Japir & Chung & Robillard 2022, new combination
No full textMonseremus bellus (Tan & Wahab, 2018) new combination (Figs 2D–F, 3C, 3D) Melaneremus? bellus Tan & Wahab, 2018: 584 Melaneremus (?) sp. — Tan & Wahab, 2018b: 132 Melaneremus bellus — Cadena-Castañeda 2019: 79 Material examined. Holotype: BRUNEI DARUSSALAM:• ♀; Ulu Temburong National Park, Kuala Belalong Field Studies Centre, primary ridge dipterocarp forest; N4.54731, E115.15697, 103.9± 8.7 m.a.s.l.; on foliage of tree; 26 July 2017, 20h31; coll. M. K. Tan (KB.17.76, ZRC). Paratypes: BRUNEI DARUSSALAM: • 1♀; Ulu Temburong National Park, Kuala Belalong Field Studies Centre, primary ridge dipterocarp forest; N4.54629, E115.15680, 133.9±9.0 m.a.s.l.; on rattan leaf; 23 September 2016; 21h49; coll. M. K. Tan (KB.16.20, ZRC) • 1♂; Ulu Temburong National Park, Kuala Belalong Field Studies Centre, primary ridge dipterocarp forest; N4.54706, E115.15720, 112.1±16.0 m.a.s.l.; on foliage of tree; 23 September 2016, 22h14; coll. M. K. Tan (KB.16.22, ZRC) • 1♂; Ulu Temburong National Park, Kuala Belalong Field Studies Centre, primary ridge dipterocarp forest; N4.54584, E115.15685, 103.3± 6.8 m.a.s.l., on foliage near ground; 25 July 2017, 21h30; coll. M. K. Tan (KB.16.63, ZRC) • 1♀; Ulu Temburong National Park, Kuala Belalong Field Studies Centre, primary ridge dipterocarp forest; N4.54730, E115.15703, 99.8±6.0 m.a.s.l.; on rattan leaf; 26 July 2017, 20h41; coll. M. K. Tan (KB.17.77, ZRC) • 1♂; Ulu Temburong National Park, Kuala Belalong Field Studies Centre, primary ridge dipterocarp forest; N4.54655, E115.15688, 101.9± 7.5 m.a.s.l.; on rattan leaf; 27 July 2017, 20h38; coll. M. K. Tan (KB.17.90, ZRC). Revised diagnosis. The male differs from that of M. appendiculatus by the medial processes of the tenth abdominal tergite: the inner margins and apices touching each other. The female differs from that of M. appendiculatus by the projections at the anterior margin of subgenital plate smaller, more flattened (in lateral view), and shorter in length than subgenital plate. Other minor differences include the male subgenital plate more transverse, ca. 2.5 times wider than long; the ovipositor <16.5 mm in length, shorter than M. appendiculatus. Distribution. BRUNEI DARUSSALAM: Temburong Ecology. This species is currently known to inhabit the lowland ridge dipterocarp forest.Published as part of Tan, Ming Kai, Japir, Razy, Chung, Arthur Y. C. & Robillard, Tony, 2022, A review of the genus Monseremus Ingrisch, 2018 (Orthoptera, Stenopelmatoidea Gryllacrididae) from Borneo, pp. 107-114 in Zootaxa 5165 (1) on pages 112-113, DOI: 10.11646/zootaxa.5165.1.5, http://zenodo.org/record/682565
Coupling between flexible ship and liquid sloshing using potential flow analysis and their effect on wave induced loads
No full textThe purpose of this study is to investigate the influence of hull flexibility on the hydrodynamic forces and moments associated with liquid sloshing, as well as the dynamic characteristics = (e.g. resonance frequencies) of the whole system. For this purpose, symmetric and antisymmetric structural responses such as bending moments and torsional moment, etc. for an idealized LNG carrier in head, beam and quartering regular waves are studied with and without coupling effect from liquid sloshing
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