55,487 research outputs found
Naruse, T., Chan, T.-Y., Tan H.H., Ahyong, S.T. & Reimer, J.D. (2012) Scientific Results of the Marine Biodiversity Expedition-KUMEJIMA 2009. Zootaxa, 3367, 1-280.
No full textNARUSE, T., CHAN, T. Y., TAN, H. H., AHYONG, S. T., REIMER, J. D. (2012): Naruse, T., Chan, T.-Y., Tan H.H., Ahyong, S.T. & Reimer, J.D. (2012) Scientific Results of the Marine Biodiversity Expedition-KUMEJIMA 2009. Zootaxa, 3367, 1-280. Zootaxa 3390 (1): 68, DOI: 10.11646/zootaxa.3390.1.7, URL: http://dx.doi.org/10.11646/zootaxa.3390.1.
Effects of oxidation and annealing temperature on grain boundary properties in polycrystalline silicon probed using nanometer-scale point-contact devices
No full textCarrier transport in polycrystalline silicon (poly-Si) is affected significantly byelectronic properties of grain boundaries (GBs). As future nanometre-scale devices, such as single-electron transistors (SETs), will have only a few GBs in the active region, the control and characterization of individual GBs will be vital to obtain reliable and reproducible device operation. We have characterized individual GBs in poly-Si using nanometer-scale devices.[1,2]In this work, we focus on the effects of oxidation and annealing temperature on the electrical characteristics of GBs. We have fabricated 30-nm-wide point-contact devices in a 50-nm-thick highly-doped n-type poly-Si film. The channel length was varied from 20 nm to 80 nm. These devices were subjected to oxidation in dry O2 gas at 650oC -1000oC for 1 hr. Some devices were followed by annealing in Ar ambient at 1000oC for15min after the oxidation. We have observed that oxidation at 650oC - 750oC oxidises the grain boundaries selectively, and that subsequent annealing increases the associated potential barrier height and tunnel resistance. These are explained by structural changes in the Si-O network at the grain boundaries and the competition between surface oxygen diffusion and oxidation from the GBs into the crystalline grains
Characterisation of tunnel barriers in polycrystalline silicon point-contact single-electron transistors
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Single-electron charging phenomena in nano/polycrystalline silicon point-contact transistors
No full textCycloptiloides 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
Heterogeneous and tissue-specific regulation of effector T cell responses by IFN-gamma during Plasmodium berghei ANKA infection.
No full textIFN-γ and T cells are both required for the development of experimental cerebral malaria during Plasmodium berghei ANKA infection. Surprisingly, however, the role of IFN-γ in shaping the effector CD4(+) and CD8(+) T cell response during this infection has not been examined in detail. To address this, we have compared the effector T cell responses in wild-type and IFN-γ(-/-) mice during P. berghei ANKA infection. The expansion of splenic CD4(+) and CD8(+) T cells during P. berghei ANKA infection was unaffected by the absence of IFN-γ, but the contraction phase of the T cell response was significantly attenuated. Splenic T cell activation and effector function were essentially normal in IFN-γ(-/-) mice; however, the migration to, and accumulation of, effector CD4(+) and CD8(+) T cells in the lung, liver, and brain was altered in IFN-γ(-/-) mice. Interestingly, activation and accumulation of T cells in various nonlymphoid organs was differently affected by lack of IFN-γ, suggesting that IFN-γ influences T cell effector function to varying levels in different anatomical locations. Importantly, control of splenic T cell numbers during P. berghei ANKA infection depended on active IFN-γ-dependent environmental signals--leading to T cell apoptosis--rather than upon intrinsic alterations in T cell programming. To our knowledge, this is the first study to fully investigate the role of IFN-γ in modulating T cell function during P. berghei ANKA infection and reveals that IFN-γ is required for efficient contraction of the pool of activated T cells
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
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