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  • Walter de Gruyter GmbH  (6)
  • 2020-2024  (6)
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  • Walter de Gruyter GmbH  (6)
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  • 2020-2024  (6)
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  • 1
    Online Resource
    Online Resource
    Palladium diselenide as a direct absorption saturable absorber for ultrafast mode-locked operations: from all anomalous dispersion to all normal dispersion
    Walter de Gruyter GmbH ; 2020
    In:  Nanophotonics Vol. 9, No. 14 ( 2020-09-10), p. 4295-4306
    Details
    In: Nanophotonics, Walter de Gruyter GmbH, Vol. 9, No. 14 ( 2020-09-10), p. 4295-4306
    Abstract: Layered transition metal dichalcogenides with excellent nonlinear absorption properties have shown remarkable performance in acting as ultrafast photonics devices. In our work, palladium diselenide (PdSe 2 ) nanosheets with competitive advantages of wide tunable bandgap, unique puckered pentagonal structure and excellent air stability are prepared by the liquid-phase exfoliation method. Its ultrafast absorption performance was verified by demonstrating conventional and dissipative soliton operations within Er-doped fiber lasers. The minimum pulse width of the conventional soliton was 1.19 ps. Meanwhile, dissipative soliton with a 46.67 mW output power, 35.37 nm spectrum width, 14.92 ps pulse width and 2.86 nJ pulse energy was also generated successfully. Our enhanced experiment results present the excellent absorption performance of PdSe 2 and highlight the capacity of PdSe 2 in acting as ultrafast photonics devices.
    Type of Medium: Online Resource
    ISSN: 2192-8614 , 2192-8606
    URL: Article
    DOI: 10.1515/nanoph-2020-0267
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2020
    detail.hit.zdb_id: 2674162-3
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  • 2
    Online Resource
    Online Resource
    Effects of ball milling on powder particle boundaries and properties of ODS copper
    Walter de Gruyter GmbH ; 2021
    In:  High Temperature Materials and Processes Vol. 40, No. 1 ( 2021-11-25), p. 361-369
    Details
    In: High Temperature Materials and Processes, Walter de Gruyter GmbH, Vol. 40, No. 1 ( 2021-11-25), p. 361-369
    Abstract: Al 2 O 3 dispersion-strengthened (ODS) copper has an excellent comprehensive performance due to the strong hindrance of the high concentration nano-Al 2 O 3 to the dislocations inside copper grains. However, the processability of ODS copper is seriously deteriorated, which is caused by the presence of unfavorable microlevel Al 2 O 3 particles along powder particle boundaries. In this study, a strategy of ball-milling-induced impurity removal is adopted to surmount the dilemma. It was found that the ball milling process can significantly weaken the formation of large Al 2 O 3 particles in the primary boundaries. However, due to the activation of the powder particle surface, the metallurgical bonding between the powder particles is strengthened. The results showed that the ball-milled samples exhibited the optimal properties, including the ultimate tensile strength of 488 ± 3 MPa, elongation of 18.7 ± 0.7%, reduction in the area of 46.8 ± 1.2%, 82.2 ± 0.3 Rockwell Hardness measured on the B scale (HRB), and electrical conductivity of 77.2 ± 0.1% International Association of Classification Societies (IACS).
    Type of Medium: Online Resource
    ISSN: 2191-0324
    URL: Article
    DOI: 10.1515/htmp-2021-0036
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2021
    detail.hit.zdb_id: 2602423-8
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  • 3
    Online Resource
    Online Resource
    Medicarpin induces G1 arrest and mitochondria-mediated intrinsic apoptotic pathway in bladder cancer cells
    Walter de Gruyter GmbH ; 2023
    In:  Acta Pharmaceutica Vol. 73, No. 2 ( 2023-06-01), p. 211-225
    Details
    In: Acta Pharmaceutica, Walter de Gruyter GmbH, Vol. 73, No. 2 ( 2023-06-01), p. 211-225
    Abstract: Bladder cancer (BC) is the tenth most commonly diagnosed cancer. High recurrence, chemoresistance, and low response rate hinder the effective treatment of BC. Hence, a novel therapeutic strategy in the clinical management of BC is urgently needed. Medicarpin (MED), an isoflavone from Dalbergia odorifera , can promote bone mass gain and kill tumor cells, but its anti-BC effect remains obscure. This study reve aled that MED effectively inhibited the proliferation and arrested the cell cycle at the G1 phase of BC cell lines T24 and EJ-1 in vitro . In addition, MED could significantly suppress the tumor growth of BC cells in vivo . Mechanically, MED induced cell apoptosis by upregulating pro-apoptotic proteins BAK1, Bcl2-L-11, and caspase-3. Our data suggest that MED suppresses BC cell growth in vitro and in vivo via regulating mitochondria-mediated intrinsic apoptotic pathways, which can serve as a promising candidate for BC therapy.
    Type of Medium: Online Resource
    ISSN: 1846-9558
    URL: Article
    DOI: 10.2478/acph-2023-0016
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2023
    detail.hit.zdb_id: 2255569-9
    SSG: 15,3
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  • 4
    Online Resource
    Online Resource
    Comparisons of different statistical models for analyzing the effects of meteorological factors on COVID-19
    Walter de Gruyter GmbH ; 2023
    In:  Frigid Zone Medicine Vol. 3, No. 3 ( 2023-08-01), p. 161-166
    Details
    In: Frigid Zone Medicine, Walter de Gruyter GmbH, Vol. 3, No. 3 ( 2023-08-01), p. 161-166
    Abstract: This general non-systematic review aimed to gather information on reported statistical models examing the effects of meteorological factors on coronavirus disease 2019 (COVID-19) and compare these models. Methods PubMed, Web of Science, and Google Scholar were searched for studies on “meteorological factors and COVID-19” published between January 1, 2020, and October 1, 2022. Results The most commonly used approaches for analyzing the association between meteorological factors and COVID-19 were the linear regression model (LRM), generalized linear model (GLM), generalized additive model (GAM), and distributed lag non-linear model (DLNM). In addition to these classical models commonly applied in environmental epidemiology, machine learning techniques are increasingly being used to select risk factors for the outcome of interest and establishing robust prediction models. Conclusion Selecting an appropriate model is essential before conducting research. To ensure the reliability of analysis results, it is important to consider including non-meteorological factors ( e.g. , government policies on physical distancing, vaccination, and hygiene practices) along with meteorological factors in the model.
    Type of Medium: Online Resource
    ISSN: 2719-8073
    URL: Article
    DOI: 10.2478/fzm-2023-0020
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2023
    detail.hit.zdb_id: 3120888-5
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  • 5
    Online Resource
    Online Resource
    Phosphine oxide for reducing flammability of ethylene-vinyl-acetate copolymer
    Walter de Gruyter GmbH ; 2021
    In:  e-Polymers Vol. 21, No. 1 ( 2021-04-30), p. 299-308
    Details
    In: e-Polymers, Walter de Gruyter GmbH, Vol. 21, No. 1 ( 2021-04-30), p. 299-308
    Abstract: In this work, a phosphorous-containing flame retardant, phenylphosphonate-based compound (EHPP), is synthesized by alcoholysis and hydrazinolysis of phenylphosphonic dichloride, which is subsequently introduced to ethylene-vinyl-acetate (EVA) copolymer to improve its flame retardant performance. The resultant compound was characterized by Fourier transform infrared (FTIR), 1 H NMR, 13 C NMR, and 31 P NMR. The influence of the EHPP on the combustion behaviors of EVA is studied by limiting oxygen index (LOI), UL-94, and cone calorimeter test. The results show that 1 wt% EHPP can reduce peak heat release rate (PHRR) by 40%. Moreover, 2 wt% EHPP can increase LOI from 20.5% to 25.5%. Thermogravimetric analysis/infrared spectrometry (TGA-FTIR) was used to detect the gaseous products of EVA/EHPP to study the gaseous-phase flame retardant mechanism. The EHPP released phosphorus-containing radicals to capture highly active free radicals to improve the flame retardancy of EVA.
    Type of Medium: Online Resource
    ISSN: 1618-7229
    URL: Article
    DOI: 10.1515/epoly-2021-0027
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2021
    detail.hit.zdb_id: 2060396-4
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  • 6
    Online Resource
    Online Resource
    Notoginsenoside R1 attenuates sevoflurane-induced neurotoxicity
    Walter de Gruyter GmbH ; 2020
    In:  Translational Neuroscience Vol. 11, No. 1 ( 2020-06-22), p. 215-226
    Details
    In: Translational Neuroscience, Walter de Gruyter GmbH, Vol. 11, No. 1 ( 2020-06-22), p. 215-226
    Abstract: Sevoflurane, a volatile anesthetic, is known to induce widespread neuronal degeneration and apoptosis. Recently, the stress-inducible protein sestrin 2 and adenosine monophosphate-activated protein kinase (AMPK) have been found to regulate the levels of intracellular reactive oxygen species (ROS) and suppress oxidative stress. Notoginsenoside R1 (NGR1), a saponin isolated from Panax notoginseng , has been shown to exert neuroprotective effects. The effects of NGR1 against neurotoxicity induced by sevoflurane were assessed. Methods Sprague-Dawley rat pups on postnatal day 7 (PD7) were exposed to sevoflurane (3%) anesthesia for 6 h. NGR1 at doses of 12.5, 25, or 50 mg/kg body weight was orally administered to pups from PD2 to PD7. Results Pretreatment with NGR1 attenuated sevoflurane-induced generation of ROS and reduced apoptotic cell counts. Western blotting revealed decreased cleaved caspase 3 and Bad and Bax pro-apoptotic protein expression. NGR1 substantially upregulated nuclear factor erythroid 2-related factor 2 (Nrf2) expression along with increased heme oxygenase-1 (HO-1) and NAD(P)H quinone oxidoreductase-1 levels, suggesting Nrf2 signaling activation. Enhanced sestrin-2 and phosphorylated AMPK expression were noticed following NGR1 pretreatment. Conclusion This study revealed the neuroprotective effects of NGR1 through effective suppression of apoptosis and ROS via regulation of apoptotic proteins and activation of Nrf2/HO-1 and sestrin 2/AMPK signaling cascades.
    Type of Medium: Online Resource
    ISSN: 2081-6936
    URL: Article
    DOI: 10.1515/tnsci-2020-0118
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2020
    detail.hit.zdb_id: 2581219-1
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