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排序方式: 共有132条查询结果,搜索用时 15 毫秒
21.
Keqing Huang Lichun Chang Yihui Hou Wenzhong Ji Thành Trần-Phú Anh Dinh Bui Azul Osorio Mayon Wei Wang Olivier Lee Cheong Lem Dang-Thuan Nguyen Grace Dansoa Tabi Leiping Duan Yun Liu Heping Shen Junliang Yang Thomas P. White Kylie R. Catchpole Klaus J. Weber The Duong 《Liver Transplantation》2024,14(17):2304073
Due to the limited interface contact and weak interfacial interaction, planar heterojunction perovskite solar cells (PSCs) have space for further improvement. Herein, a structural and chemical crosslinking interface is proposed and constructed by introducing an extra layer, which blends tin dioxide (SnO2) nanoparticles with chloride salts. Since the incorporated materials can be dissolved during the fabrication of perovskite, the quality of perovskite films is improved, leading to larger grain size and reduced trap-state density. Also, more chloride ions at the SnO2/perovskite interface are observed and the interaction between Cl− and Sn4+ is confirmed. It results in more pronounced n-type SnO2 with better conductivity and deeper conduction bands, leading to preferable energy level alignment between SnO2 and perovskite. Consequently, the open-circuit voltage and fill factor of the devices increase, and target cells present better stability, retaining 98% of initial efficiencies after >10 000 h storage in dry air (≈5% relative humidity) and maintaining 85.50% of the initial efficiency after 1000 h of operation under light. This strategy enables the achievement of 25.28% efficiency with a low bandgap (1.53 eV) perovskite composition, and it is confirmed to be universal when other related materials are utilized. 相似文献
22.
Sandra Belzner Cornelia Voigt Clive K Catchpole Stefan Leitner 《Proceedings. Biological sciences / The Royal Society》2009,276(1669):2881-2886
Many songbirds learn their songs early in life from a song model. In the absence of such a model, they develop an improvised song that often lacks the species-typical song structure. Open-ended learners, such as the domesticated canary, are able to modify their songs in adulthood, although the mechanisms that guide and time the song-learning process are still not fully understood. In a previous study, we showed that male domesticated canaries lacking an adult song model in their first year substantially change their song repertoire and composition when exposed to normally reared conspecifics in their second year. Here, we investigate song development in descendants of canaries that were raised and kept as a peer group without a song model. Such males represent tutors with abnormal song characteristics. Interestingly, the F1 generation developed quite normal song structure, and when brought into an environment with normally raised canaries in their second year, they did not modify their songs substantially. These results suggest that contact with an adult song model early in life is crucial for song crystallization, but also that song development is at least partly guided by innate rules. They also question the existing classification of canaries as open-ended learners. 相似文献
23.
Stem cells remain in specialized niches over the lifespan of the organism in many organs to ensure tissue homeostasis and enable regeneration. How the niche is maintained is not understood, but is probably as important as intrinsic stem cell self-renewal capacity for tissue integrity. We here demonstrate a high degree of phenotypic plasticity of the two main niche cell types, ependymal cells and astrocytes, in the neurogenic lateral ventricle walls in the adult mouse brain. In response to a lesion, astrocytes give rise to ependymal cells and ependymal cells give rise to niche astrocytes. We identify EphB2 forward signaling as a key pathway regulating niche cell plasticity. EphB2 acts downstream of Notch and is required for the maintenance of ependymal cell characteristics, thereby inhibiting the transition from ependymal cell to astrocyte. Our results show that niche cell identity is actively maintained and that niche cells retain a high level of plasticity. 相似文献
24.
Doses of sporulated oocysts of Eimeria ovinoidalis ranging from 102 to 5 × 106 were given to 25 housed lambs aged between 5 and 13 weeks, most of which had been reared coccidia-free. Some had received an “immunizing” dose 3–4 weeks earlier. Lambs were killed between 8 and 21 days after inoculation (DAI) and the tissues were examined histologically. Doses higher than 106 caused extensive loss of epithelial cells in the lower jejunum both from the surface and from the crypts at 10 DAI when first-generation meronts were mature. Doses of 103 oocysts or more caused diarrhoea from about 13 DAI in both first and second infections; this was associated with massive invasion of the caecal epithelium by second-generation meronts and gamonts. Destruction of crypt stem cells by these stages led to denudation of the caecal mucosa, resulting in haemorrhagic enteritis, dehydration and delayed healing or death. 相似文献
25.
Associations are established between the southern oscillation index (SOI) and penaeid prawn catches within the northern Australian
prawn fishery. Analysis involved calculation of correlations between Gulf of Carpentaria banana prawn andtiger prawn catches
and Troup’s SOI. Significant positive correlations are observed between catch size and SOI for specific months from pre-wet
to post-wet seasons. For banana prawns, the results indirectly confirm some earlier observations of increased catches in conjunction
with high rainfall during the onset of monsoon periods, but also indicate an association with late rains. However, the relationship
with tiger prawns appears to be in the opposite direction, showing negative correlations with SOI for particular months. Some
hypotheses are suggested to explain these results in terms of environmental effects on spawning populations, and comment is
made on the potential for forecasting catch sizes.
Received: 17 August 1998 / Accepted: 23 June 1999 相似文献
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27.
Adam Walker Chun-Wa Chung Margarete Neu Manish Burman Thil Batuwangala Gavin Jones Chi-Man Tang Michael Steward Michael Mullin Nadia Tournier Alan Lewis Justyna Korczynska Vicky Chung Ian Catchpole 《The Journal of biological chemistry》2016,291(11):5500-5511
A potent VEGF inhibitor with novel antibody architecture and antigen binding mode has been developed. The molecule, hereafter referred to as VEGF dual dAb (domain antibody), was evaluated in vitro for binding to VEGF and for potency in VEGF-driven models and compared with other anti-VEGF biologics that have been used in ocular anti-angiogenic therapeutic regimes. VEGF dual dAb is more potent than bevacizumab and ranibizumab for VEGF binding, inhibition of VEGF receptor binding assays (RBAs), and VEGF-driven in vitro models of angiogenesis and displays comparable inhibition to aflibercept (Eylea). VEGF dual dAb is dimeric, and each monomer contains two distinct anti-VEGF domain antibodies attached via linkers to a human IgG1 Fc domain. Mechanistically, the enhanced in vitro potency of VEGF dual dAb, in comparison to other anti-VEGF biologics, can be explained by increased binding stoichiometry. A consistent model of the target engagement has been built based on the x-ray complexes of each of the two isolated domain antibodies with the VEGF antigen. 相似文献
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29.
Bidda S. Jones Duncan H. R. Harris Clive K. Catchpole 《American journal of primatology》1993,31(1):67-75
Phee calls were recorded from five captive common marmosets on three occasions. An initial recording session was followed by further sessions 1–12 days later, and finally, 12 months after the initial sample. Sonograms from the first recordings were measured using one duration and five frequency parameters, and significant differences between individuals were found for all six parameters. Discriminant function analysis was then applied to classify each call to a particular individual, witn a resulting classification accuracy of 97.27%. Analysis of the second and third recordings demonstrated accurate classification to the same caller using the measurements obtained from the initial sample. The accuracy remained high despite intra-individual differences in acoustic structure among the three recording periods. Such differences may well reflect proximate changes in the underlying arousal state of the caller. Stability over time in the vocal signature of the phee call supports the view that this vocalization may be important in signalling individual identity over long distances, in a habitat where visual contact is limited. © 1993 Wiley-Liss, Inc. 相似文献
30.