| 1. |
- Yue, Siyao, et al.
(författare)
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Brown carbon from biomass burning imposes strong circum-Arctic warming
- 2022
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Ingår i: ONE EARTH. - : Elsevier BV. - 2590-3330 .- 2590-3322. ; 5:3, s. 293-304
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Tidskriftsartikel (refereegranskat)abstract
- Rapid warming in the Arctic has a huge impact on the global environment. Atmospheric brown carbon (BrC) is one of the least understood and uncertain warming agents due to a scarcity of observations. Here, we performed direct observations of atmospheric BrC and quantified its light-absorbing properties during a 2 month circum-Arctic cruise in summer of 2017. Through observation-constrained modeling, we show that BrC, mainly originated from biomass burning in the mid-to high latitudes of the Northern Hemisphere (similar to 60%), can be a strong warming agent in the Arctic region, especially in the summer, with an average radiative forcing of-90 mW m(-2) (similar to 30% relative to black carbon). As climate change is projected to increase the frequency, intensity, and spread of wildfires, we expect BrC to play an increasing role in Arctic warming in the future.
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| 2. |
- Chen, Hong, et al.
(författare)
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PKU-3 : An HCI-Inclusive Aluminoborate for Strecker Reaction Solved by Combining RED and PXRD
- 2015
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Ingår i: Journal of the American Chemical Society. - : American Chemical Society (ACS). - 0002-7863 .- 1520-5126. ; 137:22, s. 7047-7050
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Tidskriftsartikel (refereegranskat)abstract
- A novel microporous aluminoborate, denoted as PKU-3, was prepared by the boric acid flux method. The structure of PKU-3 was determined by combining the rotation electron diffraction and synchrotron powder X-ray diffraction data with well resolved ordered Cl- ions in the channel. Composition and crystal structure analysis showed that there are both proton and chlorine ions in the channels. Part of these protons and chlorine ions can be washed away by basic solutions to activate the open pores. The washed PKU-3 can be used as an efficient catalyst in the Strecker reaction with yields higher than 90%.
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| 3. |
- Ciabuschi, Francesco, 1973-, et al.
(författare)
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Knowledge sourcing from advanced markets subsidiaries : political embeddedness and reverse knowledge transfer barriers in emerging-market multinationals
- 2017
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Ingår i: Industrial and Corporate Change. - : Oxford University Press (OUP). - 0960-6491 .- 1464-3650. ; 26:2, s. 311-332
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Tidskriftsartikel (refereegranskat)abstract
- This article focuses on emerging-market multinationals and their intent to source knowledge from advanced countries. A single in-depth case study of a Chinese state-owned multinational is used to shed light on the relationship between political embeddedness and the potential to reverse knowledge transfer from advanced market subsidiaries. Specifically, we argue that a strong home-country political embeddedness enhances specific organizational barriers to reverse knowledge transfer, which undermines the strategic intent of knowledge-seeking internationalization, common to much Foreign Direct Investment (FDI) by emerging-market multinationals in recent years. This article contributes to research on knowledge sourcing within the context of south-north FDI by highlighting specific effects of political embeddedness at organizational level, which are critical for the possibilities to reverse knowledge transfer; our study is also relevant to international business, as new empirical insights related to the international organization and management of state-owned multinationals are discussed.
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| 4. |
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| 5. |
- Fan, Qunping, et al.
(författare)
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10.13% Efficiency All-Polymer Solar Cells Enabled by Improving the Optical Absorption of Polymer Acceptors
- 2020
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Ingår i: Solar RRL. - : Wiley. - 2367-198X. ; 4:6
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Tidskriftsartikel (refereegranskat)abstract
- The limited light absorption capacity for most polymer acceptors hinders the improvement of the power conversion efficiency (PCE) of all-polymer solar cells (all-PSCs). Herein, by simultaneously increasing the conjugation of the acceptor unit and enhancing the electron-donating ability of the donor unit, a novel narrow-bandgap polymer acceptor PF3-DTCO based on an A–D–A-structured acceptor unit ITIC16 and a carbon–oxygen (C–O)-bridged donor unit DTCO is developed. The extended conjugation of the acceptor units from IDIC16 to ITIC16 results in a red-shifted absorption spectrum and improved absorption coefficient without significant reduction of the lowest unoccupied molecular orbital energy level. Moreover, in addition to further broadening the absorption spectrum by the enhanced intramolecular charge transfer effect, the introduction of C–O bridges into the donor unit improves the absorption coefficient and electron mobility, as well as optimizes the morphology and molecular order of active layers. As a result, the PF3-DTCO achieves a higher PCE of 10.13% with a higher short-circuit current density (Jsc) of 15.75 mA cm−2 in all-PSCs compared with its original polymer acceptor PF2-DTC (PCE = 8.95% and Jsc = 13.82 mA cm−2). Herein, a promising method is provided to construct high-performance polymer acceptors with excellent optical absorption for efficient all-PSCs.
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| 6. |
- Guo, Di, et al.
(författare)
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Cholecystokinin-like peptide mediates satiety by inhibiting sugar attraction
- 2021
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Ingår i: PLOS Genetics. - : Public Library of Science (PLoS). - 1553-7390 .- 1553-7404. ; 17:8
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Tidskriftsartikel (refereegranskat)abstract
- Feeding is essential for animal survival and reproduction and is regulated by both internal states and external stimuli. However, little is known about how internal states influence the perception of external sensory cues that regulate feeding behavior. Here, we investigated the neuronal and molecular mechanisms behind nutritional state-mediated regulation of gustatory perception in control of feeding behavior in the brown planthopper and Drosophila. We found that feeding increases the expression of the cholecystokinin-like peptide, sulfakinin (SK), and the activity of a set of SK-expressing neurons. Starvation elevates the transcription of the sugar receptor Gr64f and SK negatively regulates the expression of Gr64f in both insects. Interestingly, we found that one of the two known SK receptors, CCKLR-17D3, is expressed by some of Gr64f-expressing neurons in the proboscis and proleg tarsi. Thus, we have identified SK as a neuropeptide signal in a neuronal circuitry that responds to food intake, and regulates feeding behavior by diminishing gustatory receptor gene expression and activity of sweet sensing GRNs. Our findings demonstrate one nutritional state-dependent pathway that modulates sweet perception and thereby feeding behavior, but our experiments cannot exclude further parallel pathways. Importantly, we show that the underlying mechanisms are conserved in the two distantly related insect species.
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| 7. |
- Li, Lanfen, et al.
(författare)
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Structural genomics studies of human caries pathogen Streptococcus mutans
- 2014
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Ingår i: Journal of Structural and Functional Genomics. - : Springer Science and Business Media LLC. - 1345-711X .- 1570-0267. ; 15:3, s. 9-91
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Tidskriftsartikel (refereegranskat)abstract
- Gram-positive bacterium Streptococcus mutans is the primary causative agent of human dental caries. To better understand this pathogen at the atomic structure level and to establish potential drug and vaccine targets, we have carried out structural genomics research since 2005. To achieve the goal, we have developed various in-house automation systems including novel high-throughput crystallization equipment and methods, based on which a large-scale, high-efficiency and low-cost platform has been establish in our laboratory. From a total of 1,963 annotated open reading frames, 1,391 non-membrane targets were selected prioritized by protein sequence similarities to unknown structures, and clustered by restriction sites to allow for cost-effective high-throughput conventional cloning. Selected proteins were over-expressed in different strains of Escherichia coli. Clones expressed soluble proteins were selected, expanded, and expressed proteins were purified and subjected to crystallization trials. Finally, protein crystals were subjected to X-ray analysis and structures were determined by crystallographic methods. Using the previously established procedures, we have so far obtained more than 200 kinds of protein crystals and 100 kinds of crystal structures involved in different biological pathways. In this paper we demonstrate and review a possibility of performing structural genomics studies at moderate laboratory scale. Furthermore, the techniques and methods developed in our study can be widely applied to conventional structural biology research practice.
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| 8. |
- Liu, Cong, et al.
(författare)
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Preparation, crystallization and preliminary X-ray analysis of protein YtlP from Bacillus subtilis
- 2006
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Ingår i: Acta Crystallographica. Section F: Structural Biology and Crystallization Communications. - 2053-230X. ; 62:10, s. 967-969
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Tidskriftsartikel (refereegranskat)abstract
- Bacillus subtilis YtlP is a protein that is predicted to belong to the bacterial and archael 2'-5' RNA-ligase family. It contains 183 residues and two copies of the HXTX sequence motif conserved among proteins belonging to this family. In order to determine the structure of YtlP and to compare it with the paralogue YjcG and identified 2'-5' RNA ligases, the gene ytlP was amplified from B. subtilis genomic DNA and cloned into expression vector pET-21a. The soluble protein was produced in Escherichia coli, purified to homogeneity and crystals suitable for X-ray analysis were obtained. The crystal diffracted to 2.0 angstrom and belonged to space group P2(1)2(1)2(1), with unit-cell parameters a = 34.16, b = 48.54, c = 105.75 angstrom.
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| 9. |
- Liu, Min, et al.
(författare)
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Chinese cross-border M&As in the "One Belt One Road" countries : The impact of Confucius Institutes
- 2020
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Ingår i: China economic review. - : Elsevier. - 1043-951X .- 1873-7781. ; 61
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Tidskriftsartikel (refereegranskat)abstract
- As the "One Belt One Road" (OBOR) initiative enters a new stage of substantive construction, Chinese cross-border mergers and acquisitions (M&As) are significantly increasing in the OBOR areas. Acknowledging this trend and drawing on institutional theory, this study investigates the impact of the Confucius Institute on China's cross-border M&As in the OBOR countries. It also examines how this impact is moderated by Bilateral Investment Treaties (BITs) and by comparable superior economic development and political-institution quality between home and host countries. The findings suggest that Confucius Institutes have a positive effect on the completion of M&As in OBOR countries. The effect is greater if a host country has BITs signed with China or if it has better economic development than China. This implies that, to facilitate Chinese firms' investments in OBOR areas, China should actively participate in cultural exchange activities and the establishment of Confucius Institutes should focus on those countries that have BITs with China, or which have better economic development.
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| 10. |
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