7 research outputs found
In-Situ Growth of NiFe<sub>2</sub>O<sub>4</sub>/2D MoS<sub>2</sub> p‑n Heterojunction Immobilizing Palladium Nanoparticles for Enhanced Visible-Light Photocatalytic Activities
Solar energy is considered
as a green and abundant energy for catalytic
reactions. In this work, a magnetically recoverable NiFe<sub>2</sub>O<sub>4</sub>/2D MoS<sub>2</sub>–Pd nanocomposite is successfully
synthesized via a simple one-pot hydrothermal method. The intimate
interfacial contact between NiFe<sub>2</sub>O<sub>4</sub> nanocubes
and corrugated MoS<sub>2</sub> nanosheets forms the NiFe<sub>2</sub>O<sub>4</sub>/2D MoS<sub>2</sub> p-n heterojunction, while plasmonic
Pd nanoparticles are uniformly immobilized on the surface of it. Dye
degradation and Suzuki-Miyaura coupling reaction are employed to evaluate
the photocatalytic activity of the NiFe<sub>2</sub>O<sub>4</sub>/2D
MoS<sub>2</sub>–Pd nanocomposite. Significantly, both dye degradation
and Suzuki-Miyaura coupling reaction can be efficiently performed
in a short time under mild conditions. In comparison, the physically
mixed NiFe<sub>2</sub>O<sub>4</sub>+2D MoS<sub>2</sub> heterojunction
immobilizing palladium nanoparticles shows poor photocatalytic activity.
Photocatalytic results demonstrate that the in situ formation of NiFe<sub>2</sub>O<sub>4</sub>/2D MoS<sub>2</sub> p-n heterojunction greatly
improves the visible-light absorption and facilitates the transferring
of photogenerated electrons and holes. Moreover, Pd nanoparticles
as the electron reservoirs can further suppress the electron–hole
recombination and enhance the photocatalytic activity. The construction
of semiconductive p-n heterojunction to immobilize metal nanocatalysts
will be an inspiration for other useful photocatalytic applications
Dual-Functional Starfish-like P‑Doped Co–Ni–S Nanosheets Supported on Nickel Foams with Enhanced Electrochemical Performance and Excellent Stability for Overall Water Splitting
Dual-functional
electrocatalysts have recently been reported to improve the conversion
and storage of energy generated from overall water splitting in alkaline
electrolytes. Herein, for the first time, a shape-controlled synthesis
of starfish-like Co–Ni–S nanosheets on three-dimensional
(3D) hierarchically porous nickel foams (Co–Ni–S/NF)
via a one-step hydrothermal method was developed. The influence of
reaction time on the nanosheet structure and properties was intensively
studied. After 11 h reaction, the Co–Ni–S/NF-11 sample
displays the most regular structure of nanosheets and the most outstanding
electrochemical properties. As to water splitting, hydrogen evolution
reaction (HER) and oxygen evolution reaction (OER) required overpotentials
of 284.3 and 296 mV, respectively, to provide a current density of
100 mA cm<sup>–2</sup>. The marvelous electrochemical performance
can be attributed to the conductive networks of 3D layered porous
nickel skeletons that are highly interconnected, which provided a
large specific area and highly active sites. To further enhance the
electrochemical performances of the electrocatalyst, the influence
of the doping of the P element was also studied. The results proved
that the P-doped Co–Ni–S/NF maintains the starfish structure
and demonstrates outstanding properties, providing a current density
of 100 mA cm<sup>–2</sup> with only 187.4 and 292.2 mV overpotentials
for HER and OER, respectively. It exhibited far more excellent properties
than reported dual-functional electrocatalysts. Additionally, when
used as an overall water-splitting catalyst, P–Co–Ni–S/NF
can provide a 10 mA cm<sup>–2</sup> current density at a given
cell voltage of 1.60 V in 1 M KOH, which is competitive to the best-known
electrocatalysts, with high long-term stability
Nucleoside diphosphate kinase 2 confers acquired 5-fluorouracil resistance in colorectal cancer cells
<p>Colorectal cancer (CRC) is the third leading cause of cancer-related deaths worldwide. 5-fluorouracil (5-FU)-based chemotherapeutic regimens are routinely used for the treatment of patients with CRC. However, recurrence and chemotherapeutic drug resistance limit the survival rates of patients with CRC. DNA methylation participates in diverse cellular processes by regulating the transcription of a large number of genes expression, cell division, apoptosis, cell adhesion and differentiation, and metabolism, thus it might mediate chemoresistance. Using an Illumina Infinium HD Assay, DNA methylation levels in a human 5-FU-resistant HCT-8 CRC cell line (HCT-8/FU) and its progenitor cell line HCT-8 were analysed. A total of 16,580 differentially methylated genes were identified, of which 8885 were hypermethylated and 7695 were hypomethylated in resistant cells. Among these genes, <i>NME2</i> (nucleoside diphosphate kinase 2) exhibited a significant difference in methylation between cell lines and has known roles in gastric cancer and breast cancer; accordingly, we hypothesized that it plays a role in acquired resistance in CRC. Knockdown of <i>NME2</i> restored 5-FU sensitivity in 5-FU-resistant CRC cells, reduced cell survival and increased cell apoptosis; and overexpression of <i>NME2</i> in HCT-8 cells results in the acquisition of resistance to 5-FU, this alteration enhanced HCT-8 cells growth abilities and reduced apoptosis. These findings suggest that <i>NME2</i> mediates chemoresistance to 5-FU in CRC and that specific <i>NME2</i> inhibition could optimize 5-FU-based chemotherapy of CRC.</p
Controlled Electrodeposition Synthesis of Co–Ni–P Film as a Flexible and Inexpensive Electrode for Efficient Overall Water Splitting
Synthesis
of highly efficient and robust catalysts with earth-abundant resources
for overall water splitting is essential for large-scale energy conversion
processes. Herein, a series of highly active and inexpensive Co–Ni–P
films were fabricated by a one-step constant current density electrodeposition
method. These films were demonstrated to be efficient bifunctional
catalysts for both H<sub>2</sub> and O<sub>2</sub> evolution reactions
(HER and OER), while deposition time was deemed to be the crucial
factor governing electrochemical performance. At the optimal deposition
time, the obtained Co–Ni–P-2 catalyst performed remarkably
for both HER and OER in alkaline media. In particular, it requires
−103 mV overpotential for HER and 340 mV for OER to achieve
the current density of 10 mA cm<sup>–2</sup>, with corresponding
Tafel slopes of 33 and 67 mV dec<sup>–1</sup>. Moreover, it
outperforms the Pt/C//RuO<sub>2</sub> catalyst and only needs −160
mV (430 mV) overpotential for HER (OER) to achieve 200 mA cm<sup>–2</sup> current density. Co–Ni–P electrodes were also conducted
for the proof-of-concept exercise, which were proved to be flexible,
stable, and efficient, further opening a new avenue for rapid synthesis
of efficient, flexible catalysts for renewable energy resources
Controlled Electrodeposition Synthesis of Co–Ni–P Film as a Flexible and Inexpensive Electrode for Efficient Overall Water Splitting
Synthesis
of highly efficient and robust catalysts with earth-abundant resources
for overall water splitting is essential for large-scale energy conversion
processes. Herein, a series of highly active and inexpensive Co–Ni–P
films were fabricated by a one-step constant current density electrodeposition
method. These films were demonstrated to be efficient bifunctional
catalysts for both H<sub>2</sub> and O<sub>2</sub> evolution reactions
(HER and OER), while deposition time was deemed to be the crucial
factor governing electrochemical performance. At the optimal deposition
time, the obtained Co–Ni–P-2 catalyst performed remarkably
for both HER and OER in alkaline media. In particular, it requires
−103 mV overpotential for HER and 340 mV for OER to achieve
the current density of 10 mA cm<sup>–2</sup>, with corresponding
Tafel slopes of 33 and 67 mV dec<sup>–1</sup>. Moreover, it
outperforms the Pt/C//RuO<sub>2</sub> catalyst and only needs −160
mV (430 mV) overpotential for HER (OER) to achieve 200 mA cm<sup>–2</sup> current density. Co–Ni–P electrodes were also conducted
for the proof-of-concept exercise, which were proved to be flexible,
stable, and efficient, further opening a new avenue for rapid synthesis
of efficient, flexible catalysts for renewable energy resources
Liquid Phase Exfoliation of Two-Dimensional Materials by Directly Probing and Matching Surface Tension Components
Exfoliation of two-dimensional (2D)
materials into mono- or few layers is of significance for both fundamental
studies and potential applications. In this report, for the first
time surface tension components were directly probed and matched to
predict solvents with effective liquid phase exfoliation (LPE) capability
for 2D materials such as graphene, h-BN, WS<sub>2</sub>, MoS<sub>2</sub>, MoSe<sub>2</sub>, Bi<sub>2</sub>Se<sub>3</sub>, TaS<sub>2</sub>, and SnS<sub>2</sub>. Exfoliation efficiency is enhanced when the
ratios of the surface tension components of the applied solvent is
close to that of the 2D material in question. We enlarged the library
of low-toxic and common solvents for LPE. Our study provides distinctive
insight into LPE and has pioneered a rational strategy for LPE of
2D materials with high yield
Image_3_Neoadjuvant tislelizumab and tegafur/gimeracil/octeracil (S-1) plus oxaliplatin in patients with locally advanced gastric or gastroesophageal junction cancer: Early results of a phase 2, single-arm trial.tif
BackgroundRecently, the combination of immunotherapy with chemotherapy has been recommended as first-line treatment of metastatic gastric/gastroesophageal junction (G/GEJ) in the clinical guidelines of many countries; the therapeutic potential of this application needs to be further investigated for neoadjuvant therapy of advanced G/GEJ cancer patients.MethodsWe performed a prospective, single-arm, open-label, phase 2 trial of the PD-1 inhibitor tislelizumab combined with S-1 plus oxaliplatin (SOX) in patients with advanced LAG/GEJ cancer. All patients underwent the three-cycle (21 days/cycle) treatment except for one patient who underwent two cycles. The primary endpoints were tumor major pathology response (MPR) and other events of tumor response assessed by the RECIST 1.1 and Becker criteria. Moreover, we constructed a few-shot learning model to predict the probability of MPR, which could screen those patients who might benefit from the neoadjuvant immunotherapy–chemotherapy scheme. This study was registered at https://clinicaltrials.gov/ct2/show/NCT0-4890392.ResultsThirty-two patients were enrolled; 17 patients (53.1%) achieved MPR (≤10% viable tumor cells) after treatment, and among them, 8 (25.0%) had a pathological complete response (pCR). The 1-year overall survival (OS) rate was 91.4% and the 1-year recurrence-free survival (RFS) rate was 90.0%. Adverse events occurred in 24 patients (65.6%) and grade III–IV adverse events were observed in 4 patients (12.5%) during the neoadjuvant period. Furthermore, we found commonly used preoperative assessment tools such as CT and EUS, which presented limited accuracy of tumor therapeutic response in this study; thus, we developed a therapeutic response predictive model that consisted of TNFα, IFNγ, IL-10, CD4, and age of patient, and the AUC of this FSL model was 0.856 (95% CI: 0.823–0.884).DiscussionOur study showed that the neoadjuvant PD-1 inhibitor tislelizumab combined with SOX had promising application potential and presented no increasing treatment-related adverse events in patients with advanced G/GEJ cancer. Moreover, the predictive model could help therapists to evaluate the therapeutic response of this scheme accurately.Clinical Trial Registrationhttps://clinicaltrials.gov/ct2/show/NCT0-4890392, identifier [NCT04890392].</p