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1.
BMC Microbiol ; 20(1): 103, 2020 Apr 29.
Artigo em Inglês | MEDLINE | ID: mdl-32349665

RESUMO

BACKGROUND: Different mulches have variable effects on soil physicochemical characteristics, bacterial and fungal communities and ecosystem functions. However, the information about soil microbial diversity, community structure and ecosystem function in tea plantation under different mulching patterns was limited. In this study, we investigated bacterial and fungal communities of tea plantation soils under polyethylene film and peanut hull mulching using high-throughput 16S rRNA and ITS rDNA gene Illumina sequencing. RESULTS: The results showed that the dominant bacterial phyla were Proteobacteria, Actinobacteria, Acidobacteria and Chloroflexi, and the dominant fungal phyla were Ascomycota, Mortierellomycota and Basidiomycota in all samples, but different mulching patterns affected the distribution of microbial communities. At the phylum level, the relative abundance of Nitrospirae in peanut hull mulching soils (3.24%) was significantly higher than that in polyethylene film mulching soils (1.21%) in bacterial communities, and the relative abundances of Mortierellomycota and Basidiomycota in peanut hull mulching soils (33.72, 21.93%) was significantly higher than that in polyethylene film mulching soils (14.88, 6.53%) in fungal communities. Peanut hull mulching increased the diversity of fungal communities in 0-20 cm soils and the diversity of bacterial communities in 20-40 cm soils. At the microbial functional level, there was an enrichment of bacterial functional features, including amino acid transport and metabolism and energy production and conversion, and there was an enrichment of fungal functional features, including undefined saprotrophs, plant pathogens and soils aprotrophs. CONCLUSIONS: Unique distributions of bacterial and fungal communities were observed in soils under organic mulching. Thus, we believe that the organic mulching has a positive regulatory effect on the soil bacterial and fungal communities and ecosystem functions, and so, is more suitable for tea plantation.

2.
Artigo em Inglês | MEDLINE | ID: mdl-32412866

RESUMO

In this study, an effective circulating system was developed to remove heavy metals in medical waste incineration (MWI) fly ash. MWI fly ash (MWIFA)-column experiments were performed to remove Cu, Pb, Zn, Cd and Ni from MWIFA using EDTA disodium (Na2EDTA). Iron-column experiments were conducted to study the removal effect of zero-valent iron on the five heavy metals from washing wastewater. TCLP test method was employed to evaluate heavy metals toxicity of MWIFA residues generated after 0-0.2 mol/L Na2EDTA solution treated. After washed by 0.2 mol/L Na2EDTA solution, TCLP leaching values of Cu, Pb, Zn, Cd and Ni were the lowest and satisfied the standard (GB 5085.3-2007), and the leaching values were 58.4±2.0 mg/L, 2.81±0.14 mg/L, 64.3±4.0 mg/L, 0.156±0.005 mg/L, 0.381±0.006 mg/L. Concentrations of Cu, Pb, Zn, Cd and Ni in iron-column effluent were reduced by 99.7%, 91.6%, 91.6%, 75.4% and 75.7%, respectively. Na2EDTA was recovered and recycled to the removal of heavy metals from MWIFA. Compared new Na2EDTA solution with recycled Na2EDTA solution, recycled Na2EDTA and water could be reutilized to dispose MWIFA. The removal efficiencies of Cu, Pb, Zn, Cd and Ni by recycled 0.2 mol/L Na2EDTA solution were 67.1%, 68.8%, 63.2%, 73.9%, 50.7%, respectively, the removal efficiencies that using recovered Na2EDTA decreased by 2.6%, 3.9%, 3.3%, 4.2%, and 1.6%, respectively. Successive batch experiments were also conducted to evaluate industrialization potential and reusable times for recycled Na2EDTA. After 4 recirculation cycles, extraction efficiencies of Pb and Cd (removal efficiency at different cycles divided by removal efficiency of new Na2EDTA) declined towards 80%. IMPLICATIONSAn effective circulating system was developed to remove heavy metals in MWI fly ash (MWIFA). Integration of Na2EDTA with Fe0 promoted the removal of heavy metals from MWIFA. Na2EDTA, NaCl and water were stepwise extracted from iron-column effluent, respectively. Recovered Na2EDTA can still effectively remove heavy metals from MWIFA. Results from this research indicated that this circulating system possessed industrialization potential.

3.
Nat Commun ; 11(1): 2309, 2020 May 08.
Artigo em Inglês | MEDLINE | ID: mdl-32385262

RESUMO

Electroluminescence of colloidal nanocrystals promises a new generation of high-performance and solution-processable light-emitting diodes. The operation of nanocrystal-based light-emitting diodes relies on the radiative recombination of electrically generated excitons. However, a fundamental question-how excitons are electrically generated in individual nanocrystals-remains unanswered. Here, we reveal a nanoscopic mechanism of sequential electron-hole injection for exciton generation in nanocrystal-based electroluminescent devices. To decipher the corresponding elementary processes, we develop electrically-pumped single-nanocrystal spectroscopy. While hole injection into neutral quantum dots is generally considered to be inefficient, we find that the intermediate negatively charged state of quantum dots triggers confinement-enhanced Coulomb interactions, which simultaneously accelerate hole injection and hinder excessive electron injection. In-situ/operando spectroscopy on state-of-the-art quantum-dot light-emitting diodes demonstrates that exciton generation at the ensemble level is consistent with the charge-confinement-enhanced sequential electron-hole injection mechanism probed at the single-nanocrystal level. Our findings provide a universal mechanism for enhancing charge balance in nanocrystal-based electroluminescent devices.

4.
ACS Appl Mater Interfaces ; 12(20): 23155-23164, 2020 May 20.
Artigo em Inglês | MEDLINE | ID: mdl-32336083

RESUMO

A conventional wisdom is that the sensing properties of magnetic sensors at high temperatures will be degraded due to the materials' deterioration. Here, the concept of high-temperature enhancing magnetic sensing is proposed based on the hybrid structure of SCD MEMS resonator functionalized with a high thermal-stable ferromagnetic galfenol (FeGa) film. The delta E effect of the magnetostrictive FeGa thin film on Ti/SCD cantilevers is investigated by varying the operating temperature from 300 to 773 K upon external magnetic fields. The multilayer structure magnetic sensor presents a high sensitivity of 71.1 Hz/mT and a low noise level of 10 nT/√Hz at 773 K for frequencies higher than 7.5 kHz. The high-temperature magnetic sensing performance exceeds those of the reported magnetic sensors. Furthermore, an anomalous behavior is observed on the delta E effect, which exhibits a positive temperature dependence with the law of Tn. Based on the resonance frequency shift of the FeGa/Ti/SCD cantilever, the strain coupling in the multilayers of the FeGa/Ti/SCD structure under a magnetic field is strengthened with increasing temperature. The delta E effect shows a strong relationship with the azimuthal angle, θ, as a sine function at 300 and 773 K. This work provides a strategy to develop magnetic sensors for high-temperature applications with performance superior to that of the present ones.

5.
J Phys Chem Lett ; 11(7): 2502-2509, 2020 Apr 02.
Artigo em Inglês | MEDLINE | ID: mdl-32160473

RESUMO

Searching for cost-effective photothermal material that can harvest the full solar spectrum is critically important for solar-driven water evaporation. Metal oxides are cheap materials but cannot cover the full solar spectrum. Here we prepared a hydrogenated metal oxide (H1.68MoO3) material, in which H-doping causes the insulator-to-metal phase transition of the originally semiconductive MoO3. It offers a blackbody-like solar absorption of ≥95% over the entire visible-to-near-infrared solar spectrum, owing to its unusual quasi-metallic energy band, and high solar-to-heat conversion rate due to quick relaxation of excited electrons. Using a self-floating H1.68MoO3/airlaid paper photothermal film, we achieved a stable and high water vapor generation rate of 1.37 kg m-2 h-1, a superb solar-to-vapor efficiency of 84.8% under 1 sun illumination, and daily production of 12.4 L of sanitary water/m2 from seawater under natural sunlight. This thus opens a new avenue of designing cost-effective photothermal materials based on metal oxides.

7.
Technol Health Care ; 2020 Jan 08.
Artigo em Inglês | MEDLINE | ID: mdl-31958101

RESUMO

Due to the lack of typical clinical manifestations, the incomplete Kawasaki disease (KD) is easily misdiagnosed and missed. The sudden death risk in incomplete KD cases is similar to typical KD. In this study, we report a case of a 1-year-old boy who died suddenly without any warning after incomplete KD. The boy was admitted due to fever and a cough, with preliminary diagnosis of acute severe bronchial pneumonia, but no typical KD characteristics. After antibiotics and supportive treatment, the condition worsened. Finally, the boy died after the ineffective rescue. The pathology revealed that the boy suffered from incomplete KD. From this case, we experience that, when infants or children have a long-lasting fever, the possibility of KD should not be ignored. In addition, when managing such patients, the frequency of heart ultrasound should be increased as appropriate.

8.
J Surg Res ; 246: 292-299, 2020 02.
Artigo em Inglês | MEDLINE | ID: mdl-31630013

RESUMO

BACKGROUND: Laparoscopic proximal gastrectomy (LPG) with double-tract reconstruction (DTR) is performed as a function-preserving surgery for patients with adenocarcinoma of esophagogastric junction. However, whether LPG with DTR has postoperative advantages over laparoscopic total gastrectomy (LTG) is debatable. To evaluate benefits of LPG with DTR, we compared short-term surgical outcomes between LPG with DTR and LTG for adenocarcinoma of esophagogastric junction (AEG). METHODS: Twelve patients who underwent LPG with DTR for AEG between February 2016 and August 2017 were included. Twenty-four patients who underwent LTG in the same period were matched to LPG with DTR cases for demographics, comorbidities, tumor characteristics, and tumor node metastasis stage. Short-term surgical outcomes were compared between the two groups. RESULTS: Demographics of the LPG with DTR group and LTG group were comparable. The number of harvested lymph nodes in the LPG with DTR group was less than that in the LTG group, and the amount of estimated blood loss, the operative time, the days of gas-passing, start of diet, postoperative hospital stay were not significantly different between the groups. Furthermore, the postoperative reflux symptom in the LPG with DTR group was not significantly different with that in the LTG group. However, the increasing percentages of the serum albumin, total protein, and hemoglobin levels in the LPG with DTR group were significantly higher than those in the LTG group. CONCLUSIONS: This study reveals that LPG with DTR may be a valuable procedure for the treatment of AEG because it has the advantages over LTG in terms of postoperative serum albumin, total protein, and hemoglobin.


Assuntos
Adenocarcinoma/cirurgia , Gastrectomia/efeitos adversos , Laparoscopia/efeitos adversos , Complicações Pós-Operatórias/sangue , Procedimentos Cirúrgicos Reconstrutivos/efeitos adversos , Neoplasias Gástricas/cirurgia , Adenocarcinoma/patologia , Junção Esofagogástrica/patologia , Junção Esofagogástrica/cirurgia , Feminino , Gastrectomia/métodos , Hemoglobinas/análise , Humanos , Laparoscopia/métodos , Masculino , Pessoa de Meia-Idade , Complicações Pós-Operatórias/etiologia , Procedimentos Cirúrgicos Reconstrutivos/métodos , Estudos Retrospectivos , Albumina Sérica Humana/análise , Neoplasias Gástricas/patologia , Fatores de Tempo , Resultado do Tratamento
9.
J Chem Phys ; 151(21): 214105, 2019 Dec 09.
Artigo em Inglês | MEDLINE | ID: mdl-31822070

RESUMO

We propose a fuzzy global optimization (FGO) algorithm to identify the lowest-energy structure of nanoclusters. In contrast to traditional methods implemented in the real space, FGO utilizes mostly the discrete space in a fuzzy search framework. Starting from random initial configurations, we carry out directed Monte Carlo and surface Monte Carlo in the discrete space to obtain low-energy candidate clusters and make real-space local optimizations finally to get the real global minimum structure. The performance of FGO is demonstrated in a large set of standard Lennard-Jones (LJ) clusters with up to 1000 atoms. All the putative global minima reported in the literature are successfully obtained with a low scaling of CPU time with cluster size, and new global minimum structures for LJ clusters with 894, 974, and 991 atoms are identified. Due to the unbiased nature, FGO can potentially deal with the global optimization of other nanomaterials with high efficiency and reliability.

10.
J Am Chem Soc ; 141(39): 15675-15683, 2019 Oct 02.
Artigo em Inglês | MEDLINE | ID: mdl-31503473

RESUMO

Aliphatic carboxylates are the most common class of surface ligands to stabilize colloidal nanocrystals. The widely used approach to identify the coordination modes between surface cationic sites and carboxylate ligands is based on the empirical infrared (IR) spectroscopic assignment, which is often ambiguous and thus hampers the practical control of surface structures. In this report, multiple techniques based on nuclear magnetic resonance (NMR) and IR spectra are applied to distinguish the different coordination structures in a series of zinc-blende CdSe nanocrystals with unique facet structures, including nanoplatelets dominated with {100} basal planes, hexahedrons with only three types of low-index facets (i.e., {100}, {110}, and {111}), and spheroidal dots without well-defined facets. Interpretation and assignment of NMR and IR signals were assisted by density functional theory (DFT) calculations. In addition to the identification of facet-sensitive bonding modes, the present methods also allow a nondestructive quantification of mixed ligands.

11.
Nat Commun ; 10(1): 3078, 2019 Jul 09.
Artigo em Inglês | MEDLINE | ID: mdl-31289268

RESUMO

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

12.
Surg Innov ; 26(6): 698-704, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31304882

RESUMO

Aims. We have established a procedure for uncut Roux-en-Y gastrojejunostomy after laparoscopic distal gastrectomy. This study aimed to evaluate the safety and technical feasibility of the procedure for patients with distal gastric cancer according to the short-term outcomes. Methods. Two hundred and twenty-eight consecutive patients who underwent a laparoscopic distal gastrectomy with uncut Roux-en-Y gastrojejunostomy from September 2014 to August 2018 were reviewed retrospectively. All the laparoscopic operations were performed successfully without conversion to open surgery. Results. The mean operative duration was 178.28 ± 32.82 minutes, the mean anastomotic process duration was 28.22 ± 7.50 minutes, the average blood loss was 48.97 ± 29.16 mL, and the overall number of lymph nodes harvested was 37.16 ± 11.47. The mean time of out-of-bed ambulation, anal exsufflation, liquid-diet intake, and duration of hospital stay were 41.99 ± 18.37 hours, 69.57 ± 23.17 hours, 5.06 ± 1.09 days, and 8.77 ± 2.42 days, respectively. Fifteen patients suffered postoperative complications, and the overall incidence rate was 6.58% (15/228). Seventeen patients experienced afferent recanalization, the mean time of which was 11 months after the operation. Conclusion. The laparoscopic uncut Roux-en-Y reconstruction is safe and technically feasible, and it has inspiring short-term outcomes for patients undergoing distal gastrectomy.

13.
J Cancer ; 10(14): 3197-3207, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31289590

RESUMO

Neural invasion (NI) is one of the important routes for local spread of gastric cancer (GC) correlated with poor prognosis. However, the exact cellular characteristics and molecular mechanisms of NI in GC are still unclear. Netrin-1(NTN1) as an axon guidance molecule was firstly found during neural system development. Importantly, NTN1 has an essential role in the progression of malignant tumor and specifically mediates the induction of invasion. In this study, we found NTN1 expression was significantly increased in 97 tumor tissues from GC patients and positively correlated with NI (p<0.05). In addition, we detected NTN1 knockdown significantly suppressed GC cells migration and invasion. Moreover, our results showed that reciprocity was observed between GC cells and neurites colonies in dorsal root ganglia (DRG)-GC cells co-culture vitro model. GC cells with NTN1 silencing could suppress their abilities to navigate along surrounding neuritis and this effect was depended on its receptor neogenin. In vivo, NTN1 inhibition also decreased GC cells sciatic nerve invasion. Taken together, our findings argue that NTN1 and its receptor neogenin might act synergistically in promoting GC cells neural invasion. Inhibiting the activity of NTN1 could be a potential strategy targeting NI in GC therapy.

14.
J Am Chem Soc ; 141(27): 10924-10929, 2019 Jul 10.
Artigo em Inglês | MEDLINE | ID: mdl-31200598

RESUMO

Photoelectrochemical (PEC) reduction of CO2 into chemical fuels and chemical building blocks is a promising strategy for addressing the energy and environmental challenges, which relies on the development of p-type photocathodes. Cu2O is such a p-type semiconductor for photocathodes but commonly suffers from detrimental photocorrosion and chemical changes. In this communication, we develop a facile procedure for coating a metal-organic framework (MOF) on the surface of a Cu2O photocathode, which can both prevent photocorrosion and offer active sites for CO2 reduction. As evidenced by ultrafast spectroscopy, the formed interface can effectively promote charge separation and transfer. As a result, both the activity and durability of Cu2O are dramatically enhanced for PEC CO2 reduction. This work provides fresh insights into the design of advanced hybrid photoelectrodes and highlights the important role of interfacial charge dynamics in PEC CO2 conversion.

15.
J Am Chem Soc ; 141(26): 10183-10187, 2019 Jul 03.
Artigo em Inglês | MEDLINE | ID: mdl-31203622

RESUMO

The successful fabrication of freestanding two-dimensional (2D) crystals that exhibit unprecedented high crystal quality and macroscopic continuity renovates the conventional cognition that 2D long-range crystalline order cannot stably exist at finite temperatures. Current progresses are primarily limited to van der Waals (vdW) layered materials, while studies on how to obtain 2D materials from nonlayered bulk crystals remain sparse. Herein, we report the experimental realization of vdW-like cubic ZrN single crystal and emphasize the significant role of confined electrons in stabilizing the atomic structure at the 2D limit. Furthermore, the exfoliated ZrN single-crystal films with a few nanometers thick exhibit dimensional crossover effect of emerging 2D superconductivity with the unconventional upper critical field beyond Pauli paramagnetic limit, which suggests a dimensional effect in the pairing mechanism of dimensionally confined superconductors.

16.
Opt Express ; 27(6): 8935-8942, 2019 Mar 18.
Artigo em Inglês | MEDLINE | ID: mdl-31052704

RESUMO

The authors report on a high-performance metal-semiconductor-metal (MSM) photodetector fabricated on the Cd0.96Zn0.04Te single crystal with the photoresponse from visible to near infrared region. Benefitting from the high-quality single crystallization, an ultra-low dark current of ~10-10 A was obtained at a high applied voltage of 10 V, leading to a photo-to-dark-current ratio of more than 103 at 700 nm light illumination. The highest responsivity is estimated to be 1.43 A/W with a specific detectivity of 3.31 × 1012 Jones at 10 V at a relatively lower injection power density. The discrimination ratio between the near infrared region of 800 nm and 900 nm is almost 102, which is high enough for the accurate spectra selectivity. The MSM photodetector also exhibits a fast response speed of ~800 µs and extremely low persistent photoconductivity (PPC), while the PPC is inhibited at high temperatures.

17.
J Chem Phys ; 150(16): 164101, 2019 Apr 28.
Artigo em Inglês | MEDLINE | ID: mdl-31042881

RESUMO

We present a new interpretation of the decoherence correction in surface hopping by examining the inconsistency of the traditional time-dependent Schrödinger equation and propose an elegant decoherence correction algorithm to deal with wave packet branching. In contrast to the widely used approaches based on decoherence rates, our branching corrected surface hopping (BCSH) resets the wavefunction directly after wave packet branching is identified through prediction of trajectory reflection. The appealing simplicity and reliability of BCSH are demonstrated in a series of widely studied one-dimensional and two-dimensional scattering models using exact quantum solutions and existing surface hopping approaches as references. The BCSH approach exhibits a high performance in all investigated systems, showing good potential for applications in general nonadiabatic dynamics simulations.

18.
J Chem Phys ; 150(19): 194104, 2019 May 21.
Artigo em Inglês | MEDLINE | ID: mdl-31117794

RESUMO

Surface hopping (SH) is a popular mixed quantum-classical method for modeling nonadiabatic excited state processes in molecules and condensed phase materials. The method is simple, efficient, and easy to implement, but the use of classical and independent nuclear trajectories introduces an overcoherence in the electronic density matrix which, if ignored, often leads to spurious results, such as overestimated reaction rates. Several methods have been proposed to incorporate decoherence into SH simulations, but a lack of insightful benchmarks makes their relative accuracy unknown. Herein, we run numerical simulations of common coherence-corrected SH methods including Truhlar's decay-of-mixing (DOM) and Subotnik's augmented SH using a Donor-bridge-Acceptor (DbA) model system. Numerical simulations are carried out in the superexchange regime, where charge transfer proceeds from a donor to an acceptor as a result of donor-bridge and bridge-acceptor couplings. The computed donor-to-acceptor reaction rates are compared to the reference Marcus theory results. For the DbA model under consideration, augmented SH recovers Marcus theory with quantitative accuracy, whereas DOM is only qualitatively accurate depending on whether predefined parameters in the decoherence rate are chosen wisely. We propose a general method for parameterizing the decoherence rate in the DOM method, which improves the method's reaction rates and presumably increases its transferability. Overall, the decoherence method of choice must be chosen with great care and this work provides insight using an exactly solvable model.

19.
Nat Commun ; 10(1): 1584, 2019 04 05.
Artigo em Inglês | MEDLINE | ID: mdl-30952850

RESUMO

Monolayer chalcogenide semiconductors with both luminescent and ferromagnetic properties are dreamed for simultaneous polarization and detection of the valley degree of freedom in valleytronics. However, a conventional chalcogenide monolayer lacks these coexisting properties due to their mutually exclusive origins. Herein we demonstrate that robust ferromagnetism and photoluminescence (PL) could be achieved in a (Co, Cr)-incorporated single monolayer MoS2, where the ferromagnetic interaction is activated by Co ions, and the nonradiative recombination channels of excitons is cut off by Cr ions. This strategy brings a 90-fold enhancement of saturation magnetization and 35-fold enhancement of PL intensity than the pristine MoS2 monolayer. The main reasons for the coexisting ferromagnetism and PL are the electronic interactions between the impurity bands of atop Cr adatoms and substitutional Co atoms, as well as the increased content of neutral exciton. Our findings could extend the applications of two-dimensional chalcogenides into spintronics, valleytronic and photoelectric devices.

20.
Mol Cancer ; 18(1): 71, 2019 03 30.
Artigo em Inglês | MEDLINE | ID: mdl-30927924

RESUMO

BACKGROUND: Cisplatin (CDDP) treatment is one of the most predominant chemotherapeutic strategies for patients with gastric cancer (GC). A better understanding of the mechanisms of CDDP resistance can greatly improve therapeutic efficacy in patients with GC. Circular RNAs (circRNAs) are a class of noncoding RNAs whose functions are related to the pathogenesis of cancer, but, in CDDP resistance of GC remains unknown. METHODS: circAKT3 (hsa_circ_0000199, a circRNA originating from exons 8, 9, 10, and 11 of the AKT3 gene) was identified by RNA sequencing and verified by quantitative reverse transcription PCR. The role of circAKT3 in CDDP resistance in GC was assessed both in vitro and in vivo. Luciferase reporter assay, biotin-coupled RNA pull-down and fluorescence in situ hybridization (FISH) were conducted to evaluate the interaction between circAKT3 and miR-198. Functional experiments were measured by western blotting, a cytotoxicity assay, clonogenic assay and flow cytometry. RESULTS: The expression of circAKT3 was higher in CDDP-resistant GC tissues and cells than in CDDP-sensitive samples. The upregulation of circAKT3 in GC patients receiving CDDP therapy was significantly associated with aggressive characteristics and was an independent risk factor for disease-free survival (DFS). Our data indicated that circAKT3 promotes DNA damage repair and inhibits the apoptosis of GC cells in vivo and in vitro. Mechanistically, we verified that circAKT3 could promote PIK3R1 expression by sponging miR-198. CONCLUSIONS: circAKT3 plays an important role in the resistance of GC to CDDP. Thus, our results highlight the potential of circAKT3 as a therapeutic target for GC patients receiving CDDP therapy.


Assuntos
Resistencia a Medicamentos Antineoplásicos , MicroRNAs/genética , Fosfatidilinositol 3-Quinases/genética , RNA/genética , Neoplasias Gástricas/tratamento farmacológico , Regulação para Cima , Animais , Linhagem Celular Tumoral , Sobrevivência Celular , Cisplatino/administração & dosagem , Feminino , Perfilação da Expressão Gênica , Regulação Neoplásica da Expressão Gênica , Humanos , Masculino , Camundongos , Fosfatidilinositol 3-Quinases/metabolismo , Prognóstico , Análise de Sequência de RNA , Neoplasias Gástricas/genética , Neoplasias Gástricas/metabolismo , Análise de Sobrevida , Ensaios Antitumorais Modelo de Xenoenxerto
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