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1.
Artigo em Inglês | MEDLINE | ID: mdl-33557516

RESUMO

Bimetallic organic frameworks (Bi-MOFs) have been recognized as one of the most ideal precursors to construct metal oxide semiconductor (MOS) composites, owing to their high surface area, various chemical structures, and easy removal of the sacrificial MOF scaffolds through calcination. Herein, we synthesized Zn/Ni Bi-MOF for the first time via a facile ion exchange postsynthetic strategy, formed a three-dimensional framework consisting of infinite one-dimensional chains that is unattainable through the direct solvothermal approach, and then transformed the Zn/Ni Bi-MOF into a unique ZnO/NiO heterostructure through calcination. Notably, the obtained sensor based on a ZnO/NiO heterostructure exhibits an ultrahigh response of 280.2 toward 500 ppm n-propanol at 275 °C (17.2-fold enhancement compared with that of ZnO), remarkable selectivity, and a limit of detection of 200 ppb with a notable response (2.51), which outperforms state-of-the-art n-propanol sensors. The enhanced n-propanol sensing properties may be attributed to the synergistic effects of several points including the heterojunction at the interface between the NiO and ZnO nanoparticles, especially a one-dimensional chain MOF template structure as well as the chemical sensitization effect of NiO. This work provides a promising strategy for the development of a novel Bi-MOF-derived MOS heterostructure or homostructure with well-defined morphology and composition that can be applied to the fields of gas sensing, energy storage, and catalysis.

2.
Heart ; 2021 Jan 19.
Artigo em Inglês | MEDLINE | ID: mdl-33468573

RESUMO

OBJECTIVE: We performed a meta-analysis, including dose-response analysis, to quantitatively determine the association of fried-food consumption and risk of cardiovascular disease and all-cause mortality in the general adult population. METHODS: We searched PubMed, EMBASE and Web of Science for all articles before 11 April 2020. Random-effects models were used to estimate the summary relative risks (RRs) and 95% CIs. RESULTS: In comparing the highest with lowest fried-food intake, summary RRs (95% CIs) were 1.28 (1.15 to 1.43; n=17, I2=82.0%) for major cardiovascular events (prospective: 1.24 (1.12 to 1.38), n=13, I2=75.7%; case-control: 1.91 (1.15 to 3.17), n=4, I2=92.1%); 1.22 (1.07 to 1.40; n=11, I2=77.9%) for coronary heart disease (prospective: 1.16 (1.05 to 1.29), n=8, I2=44.6%; case-control: 1.91 (1.05 to 3.47), n=3, I2=93.9%); 1.37 (0.97 to 1.94; n=4, I2=80.7%) for stroke (cohort: 1.21 (0.87 to 1.69), n=3, I2=77.3%; case-control: 2.01 (1.27 to 3.19), n=1); 1.37 (1.07 to 1.75; n=4, I2=80.0%) for heart failure; 1.02 (0.93 to 1.14; n=3, I2=27.3%) for cardiovascular mortality; and 1.03 (95% CI 0.96 to 1.12; n=6, I2=38.0%) for all-cause mortality. The association was linear for major cardiovascular events, coronary heart disease and heart failure. CONCLUSIONS: Fried-food consumption may increase the risk of cardiovascular disease and presents a linear dose-response relation. However, the high heterogeneity and potential recall and misclassification biases for fried-food consumption from the original studies should be considered.

3.
Eval Health Prof ; : 163278720971833, 2020 Nov 18.
Artigo em Inglês | MEDLINE | ID: mdl-33203226

RESUMO

Novel coronavirus disease 2019 (COVID-19) was present in most provinces of China after January 2020. We implemented a surveillance and screening strategy that included early detection of laboratory-confirmed COVID-19 cases and people who were exposed to the disease in Guangming District of Shenzhen. Separate targeted treatment and management strategies were applied to confirmed and suspected cases. From January 23 to March 13, 2020, we found 12 suspected cases, and 11 were confirmed as positive. Although eight of the 11 confirmed cases were family-aggregated, they were all imported cases with common exposure, which did not further cause local community transmission, and no medical staff were infected. After February 14, when the last case was confirmed, there were no newly confirmed cases for 28 consecutive days under the strict outbreak control. The targeted and whole-society involved prevention and control measures prevented the spread of the disease in a very short time and provided a strong guarantee for the orderly recovery of returning to work and social activities.

4.
J Hum Genet ; 2020 Sep 23.
Artigo em Inglês | MEDLINE | ID: mdl-32968204

RESUMO

To explore whether DNA methylation of the ATP-binding cassette G1 (ABCG1) gene and its dynamic change are associated with incident type 2 diabetes mellitus (T2DM). We conducted a nested case-control study with 286 pairs of T2DM cases and matched controls nested in the Rural Chinese Cohort Study. Conditional logistic regression models were used to estimate odds ratios (ORs) and 95% confidence intervals (CIs) for incident T2DM risk according to ABCG1 methylation level at baseline and its dynamic change at follow-up examination. Spearman's rank correlation coefficients were used to analyze the association between ABCG1 methylation and its possible risk factors in the control group. We found that T2DM risk increased by 16% (OR = 1.16, 95% CI = 1.02-1.31) with each 1% increase in DNA methylation levels of the ABCG1 loci CpG13 and CpG14. DNA methylation change of the ABCG1 locus CpG15 during the 6-year follow-up was associated with increased T2DM risk: T2DM risk increased by 78% in the upper tertile group (methylation gain ≥5%) versus lower tertile group (methylation gain <1%) (OR = 1.78, 95% CI = 1.01-3.15). Furthermore, body mass index was positively correlated with the DNA methylation level of the ABCG1 loci CpG13, CpG14 and CpG15. In conclusion, DNA methylation levels of the ABCG1 loci CpG13 and CpG14 and the methylation gain of locus CpG15 were positively associated with incident T2DM risk, which may suggest a possible etiologic pattern for T2DM and potentially improve T2DM prediction in rural Chinese people.

5.
Chem Commun (Camb) ; 56(83): 12636-12639, 2020 Oct 25.
Artigo em Inglês | MEDLINE | ID: mdl-32960196

RESUMO

Sensor saturation remains an obstacle to achieve reliable and quantitative detection of a specific gas at a high concentration. Herein, a new type of H2 sensor based on Au@Pd nanoparticle arrays (NAs) is demonstrated. While preserving a wide detection-range of 0.1-100% H2 concentrations, the Au@Pd NAs show a controllable saturation behavior depending on the Pd shell thickness. Mechanistically, this superior performance derives from the synergistic effect between the unique Au@Pd core-shell morphology and the rearrangement of Au@Pd nanoparticles during pre-conditioning. Our work represents a very promising strategy to design H2 sensors with enhanced performance at a high H2 concentration.

6.
ACS Appl Mater Interfaces ; 12(38): 42971-42981, 2020 Sep 23.
Artigo em Inglês | MEDLINE | ID: mdl-32865972

RESUMO

Developing a simple strategy to fabricate high-performance hydrogen sensors with long-term stability remains quite challenging. Here, we report the H2-sensing performance of Pd-decorated PdO hollow shells (Pd/PdO HSs). In this novel system, the catalyst nanoparticles (Pd NPs) and semiconductor support (PdO) are interconvertible, which is different from traditional hydrogen-sensing systems such as Pd/TiO2 and Pd/ZnO. This Pd/PdO system exhibits multiple unique properties. First, well-distributed Pd NPs with controllable density can be decorated on PdO support through a one-step NaBH4 treatment during which PdO is partially reduced into Pd. Second, the decorated Pd NPs are physically inlaid in the PdO support, which not only prevents the agglomeration or detachment of Pd NPs but also enhances the electron transfer between Pd NPs and PdO. Third, Pd/PdO HSs can be reoxidized into PdO HSs once their sensing performance degrades, which repeatedly manipulates Pd/PdO HSs under the initial reduction process, leading to the reactivation of the sensing performance. With all these advantages, Pd/PdO HSs demonstrate a detection limit lower than 1 ppm, a response/recovery time to 1% H2 of 5 s/32 s at room temperature, and a repeatable reactivation ability. The strategy presented here is convenient and time saving and has no need to prefunctionalize the PdO surface for the decoration of catalyst NPs. Moreover, the unique reactivation ability of Pd/PdO system opens a new strategy toward extending the lifetime of H2 sensors.

7.
Diabetes Metab Res Rev ; : e3370, 2020 Jun 19.
Artigo em Inglês | MEDLINE | ID: mdl-32562335

RESUMO

BACKGROUND: The evidence of the association between Chinese visceral adiposity index (CVAI) and risk of type 2 diabetes mellitus (T2DM) is limited. We explored the association of CVAI with T2DM and directly compared with the predictive power of CVAI with other visceral obesity indices (visceral adiposity index, waist to height ratio, waist circumference and body mass index) based on a large prospective study. METHODS: We conducted a population-based study of 12 237 Chinese participants. Cox proportional-hazards models were used to estimate hazard ratios (HRs) and 95% confidence intervals (CIs) for the association between CVAI and T2DM. RESULTS: During follow-up (median: 6.01 years), the incidence of T2DM was 3.29, 7.34, 12.37 and 23.72 per 1000 person-years for quartiles 1, 2, 3 and 4 of CVAI, respectively. The risk of T2DM was increased with quartiles 2, 3 and 4 vs quartile 1 of CVAI (HR 2.12 [95% CI 1.50-3.00], 2.94 [2.10-4.13] and 5.01 [3.57-7.04], Ptrend < 0.001). Per-SD increase in CVAI was associated with a 72% increased risk of T2DM (HR 1.72 [95% CI 1.56-1.88]). Sensitivity analyses did not alter the association. The area under receiver operating characteristic curve was significantly higher for CVAI than other visceral obesity indices (all P <.001). Similar results were observed in stratified analyses by sex. CONCLUSIONS: Our findings show a positive association between CVAI and risk of T2DM. CVAI has the best performance in predicting incident T2DM, so the index might be a reliable and applicable indicator identifying people at high risk of T2DM.

8.
Langmuir ; 36(26): 7392-7399, 2020 Jul 07.
Artigo em Inglês | MEDLINE | ID: mdl-32493015

RESUMO

An interesting reversible shape and structure transformation between two types of two-dimensional (2D) metal-organic frameworks (MOFs) has been successfully achieved by the spray method. The ability to precisely control the morphology and structure of 2D MOFs is also developed by altering the amount of MOF precursors and reversing the spray order. Meanwhile, the mechanism of the transformation between two MOFs is studied and conversion is induced by the change of the acidity in the reaction system. In addition, the prepared non-interpenetrate CuBDC twists exhibit more remarkable catalytic performance in C-S coupling reaction than Cu(BDC)(DMF) nanosheets owing to the more unsaturated coordination copper active sites from the non-interpenetrate structure. The catalytic result reveals the relationship between structure and function.

9.
Eur J Epidemiol ; 35(7): 655-671, 2020 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-32529512

RESUMO

Although consumption of sugar-sweetened beverages (SSBs) and artificially sweetened beverages (ASBs) has increasingly been linked with obesity, type 2 diabetes mellitus, hypertension, and all-cause mortality, evidence remains conflicted and dose-response meta-analyses of the associations are lacking. We conducted an updated meta-analysis to synthesize the knowledge about their associations and to explore their dose-response relations. We comprehensively searched PubMed, EMBASE, Web of Science, and Open Grey up to September 2019 for prospective cohort studies investigating the associations in adults. Summary relative risks (RRs) and 95% confidence intervals (CIs) were estimated for the dose-response association. Restricted cubic splines were used to evaluate linear/non-linear relations. We included 39 articles in the meta-analysis. For each 250-mL/d increase in SSB and ASB intake, the risk increased by 12% (RR = 1.12, 95% CI 1.05-1.19, I2 = 67.7%) and 21% (RR = 1.21, 95% CI 1.09-1.35, I2 = 47.2%) for obesity, 19% (RR = 1.19, 95% CI 1.13-1.25, I2 = 82.4%) and 15% (RR = 1.15, 95% CI 1.05-1.26, I2 = 92.6%) for T2DM, 10% (RR = 1.10, 95% CI 1.06-1.14, I2 = 58.4%) and 8% (RR = 1.08, 95% CI 1.06-1.10, I2 = 24.3%) for hypertension, and 4% (RR = 1.04, 95% CI 1.01-1.07, I2 = 58.0%) and 6% (RR = 1.06, 95% CI 1.02-1.10, I2 = 80.8%) for all-cause mortality. For SSBs, restricted cubic splines showed linear associations with risk of obesity (Pnon-linearity = 0.359), T2DM (Pnon-linearity = 0.706), hypertension (Pnon-linearity = 0.510) and all-cause mortality (Pnon-linearity = 0.259). For ASBs, we found linear associations with risk of obesity (Pnon-linearity = 0.299) and T2DM (Pnon-linearity = 0.847) and non-linear associations with hypertension (Pnon-linearity = 0.019) and all-cause mortality (Pnon-linearity = 0.048). Increased consumption of SSBs and ASBs is associated with risk of obesity, T2DM, hypertension, and all-cause mortality. However, the results should be interpreted cautiously because the present analyses were based on only cohort but not intervention studies.


Assuntos
Bebidas Adoçadas Artificialmente/efeitos adversos , Bebidas Gaseificadas/efeitos adversos , Diabetes Mellitus Tipo 2/epidemiologia , Diabetes Mellitus Tipo 2/etiologia , Hipertensão/etiologia , Obesidade/etiologia , Edulcorantes/efeitos adversos , Feminino , Humanos , Hipertensão/epidemiologia , Obesidade/epidemiologia , Fatores de Risco , Açúcares , Edulcorantes/administração & dosagem
10.
Nanotechnology ; 31(25): 255604, 2020 Apr 03.
Artigo em Inglês | MEDLINE | ID: mdl-32270766

RESUMO

Encapsulation of metal oxide nanoparticles (MO NPs) inside metal-organic frameworks (MOFs) has been realized successfully via surfactant-assisted nano-confined space strategy, which is a universal method for various MO NPs@MOFs. The size of MO NPs was limited by the confined nano-space and could be adjusted to a certain extent. The synthesis mechanism of MO NPs@MOFs was revealed via detailed structural characterizations and a series of control experiments. Surfactants introduced during MOFs (CuBDC, BDC = 1,4-benzenedicarboxylic acid) formation process plays a very important role in producing uniform voids of nano-confined space. Cu ions in MOF frameworks were directly used as precursors to fabricate CuO NPs in these confined void spaces. The synthesized CuO@CuBDC composites showed excellent catalytic activity in C-S cross-coupling reactions and dye pollutant photo-degradation reactions.

11.
J Hum Hypertens ; 2020 Mar 13.
Artigo em Inglês | MEDLINE | ID: mdl-32203072

RESUMO

Whether dynamic change in waist circumference is associated with progression from prehypertension to hypertension is not well understood. We explored this issue. A total of 4221 prehypertensive adults ≥18 years were enrolled during 2007-2008 and followed up during 2013-2014. Participants were classified by percentage waist-circumference change at follow-up: ≤-2.5, -2.5 to ≤2.5, 2.5 to ≤5.0, and >5.0%. Odds ratios (ORs) and 95% confidence intervals (CIs) were calculated with logistic regression models, with stable waist-circumference change (-2.5 to 2.5%) as the reference. During the 6 years of follow-up, 1464 prehypertensive patients (851 women) showed progression to hypertension, with an incidence rate of 32.7% for men and 36.3% for women. As compared with stable waist circumference, a waist-circumference gain > 5.0% was associated with increased hypertension risk: adjusted ORs (95% CI) were 1.08 (1.01-1.14) for men and 1.09 (1.04-1.15) for women. The risk also decreased significantly for men with ≥2.5% waist-circumference loss (OR = 0.94, 95% CI 0.88-1.00). We found a linear association between percentage waist-circumference gain and risk of progression from prehypertension to hypertension for both sexes by restricted cubic splines (pnonlinearity = 0.772 for men and 0.779 for women). For each 10% gain in waist circumference, the risk increased by 8% for men and 5% for women. The association remained significant for both sexes in a subgroup analysis by abdominal obesity at baseline. The long-term gain in waist circumference significantly increased the risk of progression from prehypertension to hypertension for both sexes in a rural Chinese population, regardless of abdominal obesity status at baseline.

12.
ACS Sens ; 5(2): 303-307, 2020 02 28.
Artigo em Inglês | MEDLINE | ID: mdl-32039587

RESUMO

The detection of thiocyanate (SCN-) is particularly important in industrial effluents and biological fluids because of the toxic nature of SCN-. Herein, a metal-insulator-metal (MIM) resonator for visual detection of SCN- is presented based on a poly[(2-(methacryloyloxy)ethyl) trimethylammonium chloride] (PMETAC) brush. The MIM resonator exhibits obvious color change as the concentration of SCN- changes, which can be easily distinguished by the naked eyes. In addition, the as-prepared MIM resonator also shows the advantages of good anti-interference, excellent reusability, and fast response rate. Combining the above advantages, the proposed MIM resonator may provide a broad perspective for a wide variety of visible-light applications.

13.
Nanotechnology ; 31(16): 165504, 2020 Apr 17.
Artigo em Inglês | MEDLINE | ID: mdl-31899903

RESUMO

Cu3(PO4)2 flowers are reported for the first time as a solid precursor for the preparation of hierarchical CuO particles with sea urchin-like morphology in the absence of self-assembled templates or matrixes. In the alkaline condition, Cu3(PO4)2 transforms into Cu(OH)2 firstly, and then into CuO through dehydration at room temperature. Different from soluble Cu salt as precursor, the basic building blocks for CuO are continuously supplied in a controlled manner form Cu3(PO4)2 precursor, which ensures a nearly sustained supersaturated concentration that favors heterogeneous nucleation and progressive growth of sea urchin-like CuO particles. The gas sensing property of as-prepared sea urchin-like CuO particles to ethanol is investigated. The sea urchin-like CuO particles exhibit a good sensing performance in terms of high response, short response/recovery time, good selectivity, good reproducibility, and long-term stability. The facile strategy demonstrated here opens up a new strategy to fabricate hierarchical CuO particles with enormous potential from the perspective of practical application.

14.
J Diabetes ; 12(7): 512-520, 2020 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31919985

RESUMO

BACKGROUND: This study aims to estimate type 2 diabetes mellitus (T2DM) incidence with DNA methylation of the thioredoxin-interacting protein (TXNIP) gene and its interaction with environmental factors. MATERIALS AND METHODS: This case-control study included 286 incident T2DM cases and 286 non-T2DM controls matched by sex, age, marital status, race, and residence village nested in the Rural Chinese Cohort Study. A conditional logistic regression model was used to estimate the association of DNA methylation at TXNIP gene with T2DM risk. Also, multifactor dimensionality reduction (MDR) and classification and regression tree (CART) analyses were used to investigate the interaction between TXNIP methylation and environmental risk factors. RESULTS: Methylation levels of all five CpG loci at TXNIP gene were significantly lower in T2DM than in controls (all P < .001). With increasing methylation level, risk of T2DM was significantly decreased (odds ratio, 95% CI 0.80, 0.69-0.94 for CpG1; 0.80, 0.69-0.93 for CpG2; 0.70, 0.56-0.88 for CpG3; 0.78, 0.66-0.92 for CpG4; and 0.76, 0.60-0.97 for CpG5). Additionally, the essential interactions among TXNIP methylation, obesity, and hypertriglyceridemia were identified by CART and MDR analyses. On logistic regression analysis, the risk of T2DM was reduced with terminal node 5 (CpG3 methylation ≥72%, nonobesity, normal triglyceride (TG) level, and CpG4 methylation ≥83%) vs terminal node 1 (CpG3 methylation <72%) (odds ratio 95% CI 0.20, 0.10-0.40). CONCLUSIONS: TXNIP methylation is associated with T2DM incidence in a Chinese population. Interaction between TXNIP methylation and environmental factors may influence T2DM risk and needs more investigation.

15.
Chem Commun (Camb) ; 55(83): 12567-12570, 2019 Oct 25.
Artigo em Inglês | MEDLINE | ID: mdl-31577281

RESUMO

Amorphous bimetallic coordination polymers have been prepared by a mild room temperature solution phase method and utilized as an OER electrocatalyst. Their excellent performance with an overpotential of 228 mV at 10 mA cm-2 and a Tafel slope of 30.3 mV dec-1 exhibits their great potential in the field of the OER.

16.
ACS Appl Mater Interfaces ; 11(44): 41668-41675, 2019 Nov 06.
Artigo em Inglês | MEDLINE | ID: mdl-31623430

RESUMO

Dynamic color-changing nanomaterials have been widely investigated for applications in fields like optical sensors, wearable activity monitors, smart electronic devices, and anticounterfeiting materials due to the excellent ability to change their optical properties with external variation. Here, a simple metal-insulator-metal (MIM) trilayer Fabry-Perot resonance cavity with a poly(N-isopropylacrylamide) (PNIPAm) brush layer as a responsive element is reported as a thermal-induced colorimetric response platform. The dynamic changes of conformation and physical properties of PNIPAm brush layer in response to external signals give rise to a significant color change of the MIM Fabry-Perot resonance cavity. This MIM Fabry-Perot resonance cavity shows the advantages of dynamic color change, rapid response, good repeatability, and simple construction. Additionally, the as-prepared MIM cavity shows great potential in various applications such as color printing, multicolor indicator, and information anticounterfeiting.

17.
Chem Commun (Camb) ; 55(63): 9343-9346, 2019 Aug 14.
Artigo em Inglês | MEDLINE | ID: mdl-31313763

RESUMO

A hierarchical trimetallic coordination polymer film was prepared using a spray-assisted interface synthetic strategy and in situ deposited onto Ni foam (denoted as Co0.5Ni0.3Fe0.2BDC-HCPF/Ni foam). The as-prepared material exhibits a 3D network hierarchical structure with 1D interconnected nanofibers and can be directly used as an efficient OER electrocatalyst.

18.
Chem Commun (Camb) ; 55(57): 8293-8296, 2019 Jul 11.
Artigo em Inglês | MEDLINE | ID: mdl-31249996

RESUMO

A feasible and rapid one-step strategy has been developed to fabricate 2D metal-organic framework nanosheet (MOF-NS)@fiber composites at room temperature by spray technique, through which five kinds of MOF-NS@fiber were successfully prepared. The representative nanoscale CuBDC were synthesized on the surface of carbon fibers with homogeneous dispersion and high coverage.

19.
ACS Appl Mater Interfaces ; 10(31): 25960-25966, 2018 Aug 08.
Artigo em Inglês | MEDLINE | ID: mdl-30051709

RESUMO

Metal-organic frameworks (MOFs) are an intriguing class of porous crystalline inorganic-organic hybrid materials. The fabrication of oriented, crystalline thin film of MOFs is expected to open novel avenues to traditional applications and to serve myriad advanced technologies. Here, a facile spray-assisted miscible liquid-liquid interface (MLLI) synthetic strategy is carried out and reported under mild condition that utilizes miscible interface for the rapid and controllable fabrication of large-area free-standing MOF thin films. The methodology can employ various metal nodes and organic ligands to yield various high quality lamellar/granulous MOF thin films at MLLI, which indicates the universality of the MLLI strategy.

20.
Oncotarget ; 8(43): 75455-75466, 2017 Sep 26.
Artigo em Inglês | MEDLINE | ID: mdl-29088881

RESUMO

PURPOSE: Long noncoding RNA (lncRNA) PVT1 was detected all types of cancer from Cancer Genome Atlas (TCGA) project; however, the role of PVT1 in cancer is not clear. This study aimed to reanalyze and determine the effect of PVT1 on cancer diagnosis, especially detection in serum. MATERIALS AND METHODS: Differential expression of PVT1 between cancers and corresponding normal tissues and receiver operating characteristic (ROC) curve were analyzed for all types of cancers in TCGA database. RevMan5.3, Meta-DiSc1.4 and STATA14.0 were used to estimate pooled diagnostic effects of PVT1 in tissue as well as serum. RESULTS: Compared to corresponding normal tissues, PVT1 expression was significantly upregulated in 18 types of cancer and further being an effective diagnosis biomarker in 16 of them. For the 23 diagnosis tests performed in tissue, the pooled AUC and diagnostic odd ratio (DOR) were estimated to be 0.81 (95% CI: 0.76-0.86) and 17.25 (95% CI: 8.43-35.27), when the pooled AUC and DOR were 0.83 (95%CI: 0.75-0.91) and 13.86 (95% CI: 4.70-40.66) for serum tests. Furthermore, the pooled sensitivity and specificity were 0.83 (95% CI: 0.76-0.89) and 0.74 (95% CI:0.70-0.84) for tissue as well as 0.81 (95% CI: 0.76-0.86) and 0.76 (95% CI:0.70-0.81) for serum. CONCLUSIONS: PVT1, especially in serum, might be a usable biomarker for cancer diagnosis / detection.

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