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1.
Food Chem ; 303: 125341, 2020 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-31442898

RESUMO

To find the determining factors for 3-acetyl-deoxynivalenol (3-ADON) deacetylation during wheat-based food production, wheat flours with different heat treatments, different matrixes of the starch-gluten mixture, and different protein fractions (Osborne classification) were evaluated. The deacetylation behavior of 3-ADON was significantly suppressed for heat-treated wheat flours, indicating that heating induced change of the functional or chemical properties of wheat grain components, especially for proteins. Among the different matrixes, only 3% of the 3-ADON in starch was converted to DON, however, this value reached 60-75% for wheat flour. The results showed that proteins were responsible for the deacetylation of 3-ADON. After separation, only albumins mediated the deacetylation of 3-ADON into DON in four protein fractions. The proteins were identified by LC-MS/MS, and the results suggested that cytochrome P450, acetylesterase and histone deacetylase were the potential targeted enzymes that mediated the deacetylation of 3-ADON during dough preparation for wheat-based food production.

2.
J Nanosci Nanotechnol ; 20(4): 2072-2078, 2020 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-31492214

RESUMO

Fluorescent organic dots have been widely utilized for various biological imaging. To obtain organic dots with high quantum yield (QY), different molecules with aggregation-induced emission (AIE) property and polymers with amphiphilic are used. By encapsulating AIE molecule 9,10-divinyl anthracene (DSA) with poly(styrene-co-maleic anhydride) and poly(isobutylene-alt-maleic anhydride) (PSMA and PIMA), novel bright AIE organic dots were obtained. The prepared AIE organic dots (PSMA dots and PIMA dots) had uniform particle size distribution, spherical appearance and small particle size (about 23 nm). However, PSMA dots had higher QYs than PIMA dots, and reached about 28.9% when the mass ratio of PSMA:DSA was 1:1. After folic acid (FA) conjugating to the surface of the PSMA dots, FA-dots were obtained. FA-dots possessed uniform particle size, good optical properties, stability and biocompatibility. The FA-dots could mark the cells where folate receptors were over-expressing. In vitro cell experiment indicated that FA-dots could be endocytosed into Hela cells, and marked the cell with specific.

3.
J Nanosci Nanotechnol ; 20(4): 2416-2422, 2020 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-31492256

RESUMO

In this paper, loofah sponge-based activated carbon (LAC) is prepared via loofah sponge as precursors and KOH as activator. N2 adsorption, X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to characterize the surface morphology and the structure of loofah sponge-based activated carbon. Cyclic voltammetry (CV), galvanostatic charge/discharge cycle and electrochemical impedance spectroscopy (EIS) were utilized to test electrochemical properties of loofah spongebased activated carbon. The results showed that loofah sponge-based activated carbon (LAC-700) prepared at 700 °C has the highest specific surface area (936 m²·g-1). The material delivers specific capacitance of 152.89 F·g-1 at the current density of 0.1 A·g-1, and specific capacitance of 116.69 F·g-1 at the current density of 5 A·g-1 in 30 wt% KOH aqueous electrolyte.

4.
Org Lett ; 2019 Sep 30.
Artigo em Inglês | MEDLINE | ID: mdl-31565948

RESUMO

The first examples of type B polycyclic polyprenylated acylphloroglucinols with a bicyclo[5.3.1]hendecane core, hyperberins A (1) and B (2), were isolated from Hypericum beanii, together with three biosynthetic congeners. Their structures were established by a combination of NMR, electric circular dichroism (ECD), and X-ray diffraction analyses. These isolates indicated divergent cationic cyclization as key steps in the biosynthesis of PPAPs with diverse architectures. Compounds 1 and 2 were moderately cytotoxic and exhibited significant anti-inflammatory activities.

6.
J Nat Prod ; 2019 Oct 02.
Artigo em Inglês | MEDLINE | ID: mdl-31577436

RESUMO

In our continuing search for novel natural products with antiplasmodial activity, an extract of Aniba citrifolia was found to have good activity, with an IC50 value less than 1.25 µg/mL. After bioassay-directed fractionation, the known indolizinium alkaloid anibamine (1) and the new indolizinium alkaloid anibamine B (2) were isolated as the major bioactive constituents, with antiplasmodial IC50 values of 0.170 and 0.244 µM against the drug-resistant Dd2 strain of Plasmodium falciparum. The new coumarin anibomarin A (3), the new norneolignan anibignan A (5), and six known neolignans (7-12) were also obtained. The structures of all the isolated compounds were determined based on analyses of 1D and 2D NMR spectroscopic and mass spectrometric data, and the absolute configuration of anibignan A (5) was assigned from its ECD spectrum. Evaluation of a library of 28 anibamine analogues (13-40) indicated that quaternary charged analogues had IC50 values as low as 58 nM, while uncharged analogues were inactive or significantly less active. Assessment of the potential effects of anibamine and its analogues on the intraerythrocytic stages and morphological development of P. falciparum revealed substantial activity against ring stages for compounds with two C-10 side chains, while those with only one C-10 side chain exhibited substantial activity against trophozoite stages, suggesting different mechanisms of action.

7.
Cerebrovasc Dis ; : 1-8, 2019 Oct 02.
Artigo em Inglês | MEDLINE | ID: mdl-31578010

RESUMO

OBJECT: To investigate the association between p.R4810K variant and postoperative collateral formation (PCF) in patients with moyamoya disease. METHODS: The p.R4810K variant was detected in 254 Chinese moyamoya patients. Surgically treated 273 hemispheres with preoperative and postoperative digital subtraction angiography were included. PCF was evaluated on lateral and anteroposterior views using angiography. Univariate and multivariate logistic regression analyses were performed to determine the influence factors for PCF. RESULTS: Among 254 patients, 191 (75.2%) patients carried wild-type p.R4810K variant (GG) and 63 patients (24.8%) carried the heterozygous p.R4810K variant (GA). PCF was better in patients with GA than in patients with GG both on lateral views and anteroposterior views (p < 0.001 and p < 0.001). Over the median 7 months follow-up after discharge, good PCF was observed in 201 hemispheres (73.6%), and poor PCF was observed in 72 hemispheres (26.4%). The univariable logistic regression showed that patients with GA (OR 4.681; 95% CI 1.925-11.383; p = 0.001) was associated with good PCF. On the other hand, the increasing age (OR 0.971; 95% CI 0.952-0.989; p = 0.002) and the presence of hemorrhage (OR 0.189; 95% CI 0.096-0.374; p = 0.000) were associated with poor PCF. Multivariate logistic regression analyses of p.R4810K variant and clinical variables showed that GA (OR 3.671; 95% CI 1.452-9.283; p = 0.006) was associated with a good PCF, while the presence of hemorrhage (OR 0.258; 95% CI 0.065-0.362; p = 0.000) was identified as a predictor of poor PCF. CONCLUSIONS: The heterozygous p.R4810K variant was associated with better PCF.

8.
Sci Adv ; 5(9): eaax4473, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31579825

RESUMO

Easy-to-perform, relatively inexpensive blood diagnostics have transformed at-home healthcare for some patients, but they require analytical equipment and are not easily adapted to measuring other biomarkers. The requirement for reliable quantification in complex sample types (such as blood) has been a critical roadblock in developing and deploying inexpensive, minimal-equipment diagnostics. Here, we developed a platform for inexpensive, easy-to-use diagnostics that uses cell-free expression to generate colored readouts that are visible to the naked eye, yet quantitative and robust to the interference effects seen in complex samples. We achieved this via a parallelized calibration scheme that uses the patient sample to generate custom reference curves. We used this approach to quantify a clinically relevant micronutrient and to quantify nucleic acids, demonstrating a generalizable platform for low-cost quantitative diagnostics.

9.
Org Biomol Chem ; 2019 Oct 03.
Artigo em Inglês | MEDLINE | ID: mdl-31580376

RESUMO

We reported a new method that visible light along with cercosporin, one of the naturally occurring perylenequinonoid pigments with excellent properties of photosensitization, photocatalyzed sp3 (C-H) activation for the synthesis of pyrrolo[3,4-c]quinolones through the annulation of anilines and maleimides under mild conditions.

10.
New Phytol ; 2019 Sep 30.
Artigo em Inglês | MEDLINE | ID: mdl-31569267

RESUMO

Two types of tonoplast proton pumps, H+ -pyrophosphatase (V-PPase) and the H+ -ATPase (V-ATPase), establish the proton gradient that powers molecular traffic across tonoplast thereby facilitating turgor regulation and nutrient homeostasis. However, how proton pumps regulate development remains unclear. In this study, we investigated the function of two types of proton pumps in Arabidopsis embryo development and pattern formation. While disruption of either V-PPase or V-ATPase had no obvious effect on plant embryo development, knocking out both resulted in severe defects in embryo pattern formation from the early stage. While the first division in wild type zygote was asymmetric, a nearly symmetric division occurred in the mutant, followed by abnormal pattern formation at all stages of embryo development. The embryonic defects were accompanied by dramatic differences in vacuole morphology and distribution, as well as disturbed localization of PIN1. The development of mutant cotyledons and root, and the auxin response of mutant seedlings supported the hypothesis that mutant lacking tonoplast proton pumps were defective in auxin transport and distribution. Taking together, we proposed two tonoplast proton pumps are required for vacuole morphology and PIN1 localization thereby controlling vacuole and auxin related developmental processes in Arabidopsis embryos and seedlings.

11.
Zhong Nan Da Xue Xue Bao Yi Xue Ban ; 44(8): 924-930, 2019 Aug 28.
Artigo em Chinês | MEDLINE | ID: mdl-31570681

RESUMO

OBJECTIVE: To investigate the cognitive ability and coping strategy to mental disorders among medical workers in ear-nose-throat departments and its impact on doctor-patient relationship.
 Methods: A total of 78 medical workers (including doctors, nurses, and technicians) in ear-nose-throat departments from 10 general hospitals in Hunan Province were investigated by self-compiled questionnaire on the perspective and coping strategy to mental disorders among medical workers.
 Results: Mental disorders except depression and schizophrenia were poorly understood in respondents, and many of their coping strategies were inappropriate. Furthermore, subjects tend to avoid too much contact with psychiatric patients for being afraid of the mental disorders. The poorer understanding of mental disorders, the more inappropriate coping strategies in dealing with mental disorders (P<0.001). Moreover, there was a significant difference in inappropriate coping strategies to mental disorders between patients being abused and patients not being abused (P=0.017). Factors such as education background (P=0.031) and the hospital level (P=0.038) also impacted the coping strategies to mental disorders.
 Conclusion: Among all mental disorders, only depression and schizophrenia are coped with the right way in medical workers of ear-nose-throat departments. In addition, obviously negative attitude and avoidance are found in dealing with mental disorders by medical workers. Importantly, poor cognitive ability to mental disorders is the main reason for hurting doctor-patient relationship in the ear-nose-throat departments.

12.
J Nurs Manag ; 2019 Sep 30.
Artigo em Inglês | MEDLINE | ID: mdl-31571326

RESUMO

AIMS: To explore the relationship between job burnout and quality of working life, and identify influencing factors of nurses' quality of working life. BACKGROUND: Understanding the influencing factors of quality of working life is important to improve nursing retention strategies. Job burnout can negatively influence work efficiency and quality of work. However, studies examining the association between the two remain limited. METHODS: The cross-sectional survey of 2504 nurses was performed in Eastern China. Nurses were invited to complete self-report questionnaires online. The collected data were analyzed using Pearson's correlation and multiple regression. RESULTS: 64.0% of nurses experienced job burnout, and their quality of working life was at a moderate level. Job burnout, hospital level, age, income, night shift and patient-to-nurse ratio were significant factors of quality of working life. CONCLUSION: Job burnout has a negative effect on nurses' quality of working life. Some demographic and work-related factors should be considered when developing interventions to improve nurses' quality of working life. IMPLICATIONS FOR NURSING MANAGEMENT: Hospital and nurses managers should develop strategies to reduce nurses' job burnout and enhance their quality of working life, such as optimum nurse staffing, offer reasonable pecuniary compensation, and establish an appropriate shift work schedule.

13.
Epigenomics ; 2019 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-31571508

RESUMO

The International 3D Genomics Workshop is an annual international scientific conference focused on the research of the 3D structure of the genome in the nucleus. The 5th International 3D Genomics Workshop 2018 was held at the International Academic Center of Huazhong Agricultural University on the 13th-14th of October 2018. It attracted >150 international and local participants, including leading researchers in the field of the 3D genomics and editors from top journals. The main topic of the conference was the research achievements newly published or unpublished on the 3D genome area. The invited speakers shared their works on the topic of the new detection technologies on the 3D genome, the advanced computational analysis algorithms or suites, the nucleus microimaging technique, the simulation modeling method, the application on the biological research in different species (human, animals, plants, microorganisms, etc.) and the applications of 3D genome on medicine and agriculture. The workshop provided a forum to discuss the latest scientific news and ideas from the field of 3D genome research on various aspects of interesting topics.

14.
Eur J Med Chem ; 183: 111731, 2019 Sep 25.
Artigo em Inglês | MEDLINE | ID: mdl-31577977

RESUMO

With the expectation to find out new anti-gastric cancer agents with high efficacy and selectivity, a series of novel tertiary sulfonamide derivatives were synthesized and the anti-cancer activity was studied in three selected cancer cell lines (MGC-803, PC-3, MCF-7) in vitro. Some of the synthesized compounds could significantly inhibit the proliferation of these tested cancer cells and were more potent than the positive control (5-Fu). The structure-activity relationship of tertiary sulfonamide derivatives was explored in this report. Among the tested compounds, compound 13g containing benzimidazole moiety showed the best anti-proliferation activities against MGC-803 cells (IC50 = 1.02 µM), HGC-27 cells (IC50 = 1.61 µM), SGC-7901 (IC50 = 2.30 µM) cells as well as the good selectivity between the cancer and normal cells. Cellular mechanism studies elucidated compound 13g inhibited the colony formation of gastric cancer cell lines. Meanwhile, compound 13g arrested cell cycle at G2/M phase and induced cell apoptosis. Mechanistically, compound 13g markedly decreased p-Akt and p-c-Raf expression, which revealed that compound 13g targeted gastric cancer cell lines via interfering with AKT/mTOR and RAS/Raf/MEK/ERK pathways. All the findings suggest that compound 13g might be a valuable lead compound for the anti-gastric cancer agents.

15.
Artigo em Inglês | MEDLINE | ID: mdl-31581091

RESUMO

Bayesian networks are a powerful method for identifying causal relationships among variables. However, as the network size increases, the time complexity of searching the optimal structure grows exponentially. We proposed a novel search algorithm - Fast and Furious Bayesian Network (FFBN). Compared to the existing greedy search algorithm, FFBN uses significantly fewer model configuration rules to determine the causal direction of edges when constructing the Bayesian network, which leads to greatly improved computational speed. We benchmarked the performance of FFBN by reconstructing gene regulatory networks (GRNs) from two DREAM5 challenge datasets. In both datasets, FFBN shows a much faster speed than the existing greedy search algorithm, while maintaining equally good or better performance in recall and precision. We then constructed three whole transcriptome GRNs for primary liver cancer (PL), primary colon cancer (PC) and colon to liver metastasis (CLM) expression data, which the existing greedy search algorithms failed. Three GRNs contain 12,099 common genes. Unprecedentedly, our newly developed FFBN algorithm is able to build up GRNs at a scale larger than 10,000 genes. Using FFBN, we discovered that CLM has its unique cancer molecular mechanisms and shares a certain degree of similarity with both PL and PC.

16.
Gut ; 2019 Oct 03.
Artigo em Inglês | MEDLINE | ID: mdl-31582403

RESUMO

OBJECTIVE: N6-methyladenosine (m6A) RNA methylation and its associated methyltransferase METTL3 are involved in tumour initiation and progression via the regulation of RNA function. This study explored the biological function and clinical significance of METTL3 in gastric cancer (GC). DESIGN: The prognostic value of METTL3 expression was evaluated using tissue microarray and immunohistochemical staining analyses in a human GC cohort. The biological role and mechanism of METTL3 in GC tumour growth and liver metastasis were determined in vitro and in vivo. RESULTS: The level of m6A RNA was significantly increased in GC, and METTL3 was the main regulator involved in the abundant m6A RNA modification. METTL3 expression was significantly elevated in GC tissues and associated with poor prognosis. Multivariate Cox regression analysis revealed that METTL3 expression was an independent prognostic factor and effective predictor in human patients with GC. Moreover, METTL3 overexpression promoted GC proliferation and liver metastasis in vitro and in vivo. Mechanistically, P300-mediated H3K27 acetylation activation in the promoter of METTL3 induced METTL3 transcription, which stimulated m6A modification of HDGF mRNA, and the m6A reader IGF2BP3 then directly recognised and bound to the m6A site on HDGF mRNA and enhanced HDGF mRNA stability. Secreted HDGF promoted tumour angiogenesis, while nuclear HDGF activated GLUT4 and ENO2 expression, followed by an increase in glycolysis in GC cells, which was correlated with subsequent tumour growth and liver metastasis. CONCLUSIONS: Elevated METTL3 expression promotes tumour angiogenesis and glycolysis in GC, indicating that METTL3 expression is a potential prognostic biomarker and therapeutic target for human GC.

17.
Org Lett ; 2019 Oct 04.
Artigo em Inglês | MEDLINE | ID: mdl-31584288

RESUMO

A catalyst-controlled cycloaddition reaction of bis(indol-3-yl)-allenes gives rise to two different types of fused spiroindolines bearing a spiro quaternary stereocenter, affording a range of fused spiroindolines in good yields. The asymmetric desymmetrization of bis(indol-3-yl)-allenes with very high regioselectivities and excellent enantioselectivities has been successfully established and catalyzed by (R)-DTBM-Segphos(AuNTf2)2. Mechanistic studies through control experiments and DFT calculations provide plausible mechanistic proposals.

18.
Zhongguo Dang Dai Er Ke Za Zhi ; 21(9): 881-885, 2019 Sep.
Artigo em Chinês | MEDLINE | ID: mdl-31506146

RESUMO

OBJECTIVE: To investigate the pathogen composition and clinical features of preterm infants with sepsis, and to provide a basis for early identification and treatment of sepsis in preterm infants. METHODS: A retrospective analysis was performed for the clinical data of 371 preterm infants with sepsis who had a positive blood culture between January 2014 and May 2018. According to the time of onset, the preterm infants were divided into an early-onset group (an age of onset of <7 days) with 73 preterm infants and a late-onset group (an age of onset of ≥7 days) with 298 preterm infants. The two groups were compared in terms of pathogen composition and clinical features (initial symptoms, laboratory examination results at the time of onset, comorbidities, and prognosis). RESULTS: There was a higher proportion of infants with Klebsiella pneumoniae infection in the late-onset group (P<0.05), while there was a higher proportion of infants with Escherichia coli, Streptococcus agalactiae or Listeria infection in the early-onset group (P<0.05). The early-onset group had a significantly higher proportion of infants with dyspnea than the late-onset group (P<0.05). Compared with the late-onset group, the early-onset group had significantly shorter time to negative conversion of blood culture, duration of antibiotic use before infection, and indwelling time of deep venous catheterization (P<0.05), and the late-onset group had a significantly higher incidence rate of neonatal necrotizing enterocolitis than the early-onset group (P<0.05). The early-onset group had a significantly higher rate of treatment withdrawal than the late-onset group (P<0.05). CONCLUSIONS: Preterm infants with sepsis lack typical clinical manifestations and laboratory examination results at the time of onset. There are certain differences in pathogen composition and clinical features between preterm infants with early- and late-onset sepsis. Possible pathogens for sepsis should be considered based on age in days at the time of onset and related clinical features.


Assuntos
Sepse , Enterocolite Necrosante , Humanos , Lactente , Recém-Nascido , Recém-Nascido Prematuro , Estudos Retrospectivos , Streptococcus agalactiae
19.
Pract Radiat Oncol ; 2019 Sep 19.
Artigo em Inglês | MEDLINE | ID: mdl-31542454

RESUMO

PURPOSE: This study recruited two centers with expertise in treating pediatric brain tumors with robotic radiation delivery system photon therapy and proton therapy, respectively, to study the plan quality and the dose deposition characteristics of robotic radiation delivery system photon and intensity modulated proton therapy (IMPT) plans. METHODS AND MATERIALS: A total of 18 patients clinically treated with robotic radiation delivery system were planned with intensity-modulated-proton-therapy (IMPT). Cases were planned per the standard of care of each institution but, respected the same planning objectives. The comparison was performed in three aspects: the plan quality, dose fall-off characteristics around target volume and the volume of high, intermediate, and low dose bath. RESULTS: All robotic radiation delivery system and IMPT plans meet the planning objectives. However, IMPT significantly reduces the maximum dose of the OARs away from the planning target volume (PTV) such as cochlea and eye (P< 0.05) and the mean dose of normal brain (P<0.05). No statistical significant difference is observed in the maximum dose of the optical pathway and brain stem. Robotic radiation delivery system plans demonstrate a sharper dose fall-off within 5-mm around the PTV (P<0.05) while IMPT significantly lower the doses to the normal tissue that are beyond 10-mm away from the PTV (P<0.05). The robotic radiation delivery system offers smaller high-dose-bath while the IMPT offers a smaller low-dose-bath (P<0.05). However, the difference of the intermediate dose is not statistically significant. CONCLUSION: In general, robotic radiation delivery system plans exhibit reduced high dose exposure to normal tissue while IMPT plans have considerably smaller volumes of low dose exposure with differences in medium range dose bath increasingly favoring protons as tumor size increases.

20.
Mol Med Rep ; 2019 Sep 16.
Artigo em Inglês | MEDLINE | ID: mdl-31545442

RESUMO

Cell migration is important for renal recovery from tubular cell injury. Heat shock transcription factor 1 (HSF1) is a well­studied regulatory factor that is active during acute kidney injury. HSF1 is also involved in the migration process during tumor metastasis. Therefore, we hypothesized that HSF1 may promote the recovery of renal function by affecting kidney tubular cell migration. A wound healing assay was used to examine the cell migration rate. The results demonstrated that the migration of rat kidney proximal tubular cells (RPTCs) was increased following knockdown of HSF1. In addition, the invasion ability of HSF1 knockdown RPTCs was also significantly upregulated. The present study also identified that transforming growth factor­ß1 (TGF­ß1) was highly expressed at the edge of the wound in control cells, and its expression was further increased upon knockdown of HSF1. Inhibition of TGF­ß1 signaling prevented RPTC HSF1 knockdown cell migration, suggesting that HSF1­regulated RPTC cell migration was dependent on the TGF­ß1 signaling pathway. Furthermore, phosphorylation of TGF­ß1 and Smad2/3 was induced in HSF1 knockdown cells. Together, these results suggest that HSF1 may suppress RPTC migration by inhibiting the activation of the TGF­ß1­Smad2/3 signaling pathway.

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