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1.
PLoS One ; 16(3): e0248037, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33667257

RESUMO

In China, the majority of food enterprises are small-sized and medium-sized. While the supervision costs are high, food safety issues are still emerging. Food circulation is an indispensable part in the entire food chain. At present, there are few studies on the regional spread of food safety risks in the circulation field from a macro perspective. This study combines GIS and social network analysis methods to deeply explore the regional circulation characteristics of substandard foods. First, we crawl the dataset of Food Safety Sampling Inspection Result Query System. Then we obtain the geographical locations of the manufacturers and distributors by GIS. Finally, we construct the province-level and city-level substandard foods' circulation networks, and employ social network analysis to target key cities and paths. The experimental results show that the circulations of substandard foods are characterized by dense province-level network and sparse city-level network, and they are mostly local and short-distance trafficking. 361 cities are divided into 13 city clusters considering the network connection characteristics. Chongqing, Beijing, Zhengzhou, and Changsha are identified as key cities by all measurement indicators, and at least four indicators can identify Shanghai and Wuhan. These cities have the highest priority for combating substandard foods' circulation networks.

2.
Nat Commun ; 12(1): 178, 2021 Jan 08.
Artigo em Inglês | MEDLINE | ID: mdl-33420010

RESUMO

Tandem organic solar cells are based on the device structure monolithically connecting two solar cells to broaden overall absorption spectrum and utilize the photon energy more efficiently. Herein, we demonstrate a simple strategy of inserting a double bond between the central core and end groups of the small molecule acceptor Y6 to extend its conjugation length and absorption range. As a result, a new narrow bandgap acceptor BTPV-4F was synthesized with an optical bandgap of 1.21 eV. The single-junction devices based on BTPV-4F as acceptor achieved a power conversion efficiency of over 13.4% with a high short-circuit current density of 28.9 mA cm-2. With adopting BTPV-4F as the rear cell acceptor material, the resulting tandem devices reached a high power conversion efficiency of over 16.4% with good photostability. The results indicate that BTPV-4F is an efficient infrared-absorbing narrow bandgap acceptor and has great potential to be applied into tandem organic solar cells.

3.
Adv Mater ; 30(16): e1707516, 2018 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-29534318

RESUMO

Nanophase-separated membranes hold promise for fast molecule or ion transfer. However, development and practical application are significantly hindered by both the difficulty of chemical modification and nanophase instability. This can be addressed by organic-inorganic hybridization of functional fillers with a precise distribution in specific nanophase. Here, a molecular-level hybridization for nanophase-separated Nafion using 2-5 nm quantum dots (QDs) as a new smart filler is demonstrated. Two kinds of QDs are prepared and used: hydrophilic polymer-like QDs (PQDs) and hydrophobic graphene oxide QDs (GQDs). Because of selective interactions, QDs offer advantages of matched structural size and automatic recognition with the nanophase. A distinctive synthesis of subordinate-assembly, in which QDs are driven by the self-assembly of Nafion affinity chains, is reported. This results in a precise distribution of QDs in the ionic, or backbone, nanophases of Nafion. The resulting PQDs in the ionic nanophase significantly increase membrane proton conduction and device output-power without loss of mechanical stability. This is difficult to realize with conventional fillers. The GQDs in the backbone nanophase reduce the crystallinity and significantly augment membrane water uptake and swelling capacities.

4.
Biotechnol Lett ; 35(5): 671-7, 2013 May.
Artigo em Inglês | MEDLINE | ID: mdl-23338703

RESUMO

To develop a novel peptide probe for imaging detection of colorectal cancer, a 12-mer phage display library was used to select peptides that bind specifically to the human colorectal cancer cell line Caco-2. After four rounds of panning, four phage clones that bound specifically to the Caco-2 cells were selected. The phage clone SP-2 had a particularly high affinity and specificity for Caco-2 cells. This clone was identified using a series of methods. The peptide SP-2 that was displayed on phage SP-2 exhibited a high specificity to Caco-2 cells. Thus, the peptide SP-2 could be a candidate probe for the detection of colorectal cancer.


Assuntos
Neoplasias Colorretais/química , Imagem Molecular/métodos , Proteínas de Neoplasias/química , Peptídeos/química , Ligação Competitiva , Células CACO-2 , Células HEK293 , Humanos , Microscopia de Fluorescência , Biblioteca de Peptídeos , Reprodutibilidade dos Testes
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