Association between visceral fat area and serum uric acid in Chinese adults: A cross-sectional study.

BACKGROUND AND AIMS: Hyperuricemia has become a vital public health problem affecting the health of residents. The visceral fat area (VFA) is closely related to many chronic diseases. However, the association between VFA and hyperuricemia within the Chinese adult population remains nebulous. The aim of the research is to assess the relationship between VFA and serum uric acid levels. METHODS AND RESULTS: From June 2020 to June 2021, a total of 340 Chinese adults (240 in the control group and 100 in the hyperuricemia group) were recruited from the physical examination center of Hongqi Hospital Affiliated to Mudanjiang Medical University. General demographic characteristics were collected by questionnaire. VFA was measured by a body composition analyzer, and serum biochemical indices were detected by clinical laboratory. VFA in the hyperuricemia group was higher than in the control group (P＜0.05). Further, VFA demonstrated a positive correlation with serum uric acid level (rs = 0.370, P＜0.001). To further explore this relationship, we divided the VFA into quartiles (＜P25, P25-P50, P50-P75, ≥P75). Upon comparison with the ＜P25 group, we found the VFA in the P25-P50, P50-P75, and ≥P75 groups to be associated with a substantially escalated risk of hyperuricemia, even after adjusting for age, gender, body weight, fasting plasma glucose, calcium, alanine transaminase, urea, alkaline phosphatase, and γ-glutamyltransferase. The OR and 95% CI were 2.547 (1.023, 6.341), 3.788 (1.409, 10.187) and 3.723 (1.308, 10.595), respectively (P＜0.05). CONCLUSION: VFA has a positive correlation with serum uric acid levels and may serve as a crucial predictive marker for hyperuricemia.

Physiological Responses of Ribosomal Protein S12 K43 Mutants of Corynebacterium glutamicum.

Bacterial resistance to streptomycin is often acquired as a consequence of mutations in rpsL, the gene encoding ribosomal protein S12. Corynebacterium glutamicum is a non-pathogenic Gram-positive soil bacterium that has been widely used in industry. In a previous study, we screened several streptomycin-resistant rpsL K43 mutants of C. glutamicum, and surprisingly found that two of them also confer chloramphenicol and/or kanamycin resistance. In order to understand whether or not a single mutation of rpsLK43 could confer resistance to multiple antibiotics, in this study we attempted to construct saturation mutagenesis of rpsL K43 by rational genetic manipulation. Despite many efforts had been made, only nine mutants were successfully constructed. They were indeed resistant to streptomycin, but not to other antibiotics. This suggested that other mutations should be acquired, contributing to multiple antibiotics in the screened strains. The growth and enhanced green fluorescent protein (eGFP) expression of these nine mutants were then investigated. The results showed that they grew differently in CGXII minimal medium, but not in BHI medium. When cultured in the absence of streptomycin, the expression of eGFP was positively proportional to the growth, approximately, while in the presence of streptomycin, the expression of eGFP was proportional to the ability of streptomycin resistance.

Efficient fermentative production of L-theanine by Corynebacterium glutamicum.

L-Theanine is a unique non-protein amino acid found in tea plants that has been shown to possess numerous functional properties relevant to food science and human nutrition. L-Theanine has been commercially developed as a valuable additive for use in food and beverages, and its market is expected to expand substantially if the production cost can be lowered. Although the enzymatic approach holds considerable potential for use in L-theanine production, demand exists for developing more tractable methods (than those currently available) that can be implemented under mild conditions and will reduce operational procedures and cost. Here, we sought to engineer fermentative production of L-theanine in Corynebacterium glutamicum, an industrially safe host. For L-theanine synthesis, we used γ-glutamylmethylamide synthetase (GMAS), which catalyzes the ATP-dependent ligation of L-glutamate and ethylamine. First, distinct GMASs were expressed in C. glutamicum wild-type ATCC 13032 strain and GDK-9, an L-glutamate overproducing strain, to produce L-theanine upon ethylamine addition to the hosts. Second, the L-glutamate exporter in host cells was disrupted, which markedly increased the L-theanine titer in GDK-9 cells and almost eliminated the accumulation of L-glutamate in the culture medium. Third, a chromosomally gmasMm-integrated L-alanine producer was constructed and used, attempting to synthesize ethylamine endogenously by expressing plant-derived L-serine/L-alanine decarboxylases; however, these enzymes showed no L-alanine decarboxylase activity under our experimental conditions. The optimal engineered strain that we ultimately created produced ~ 42 g/L L-theanine, with a yield of 19.6%, in a 5-L fermentor. This is the first report of fermentative production of L-theanine achieved using ethylamine supplementation.

Managers in the publicly funded health services in China - characteristics and responsibilities.

BACKGROUND: Health service managers are integral to supporting the effective and efficient delivery of services. Understanding their competencies is essential to support reform and improvement of healthcare provision in China. This paper examines the characteristics and educational background of senior managers working in the community health and hospital sectors in China. We also examine their levels of commitment to continued professional development and continuous education. METHODS: A self-administered paper-based questionnaire was administered to 477 level I, II and III managers in community health services and public hospitals in China. The response rate was over 80%. RESULTS: Findings demonstrate significant differences in terms of educational background and commitment to ongoing professional development between the managers in China across levels of management, and between the community and hospital sectors. Hospital managers tend to be older; hospital managers at higher management levels are predominantly male but predominantly female in the community health services. A greater proportion of hospital managers have postgraduate qualifications. In addition, the participants identified specific management tasks that they considered important. CONCLUSIONS: This is the first large scale study examining the educational background and commitment to professional development of senior health service managers in China. This study determined that there are differences between the demographics of managers in China across levels of management, but more importantly between the CHC and the hospital sectors. The identification of important managerial tasks will facilitate the development of appropriate education and training for Chinese healthcare managers. All sectors and levels reported the need for informal education focussed on the core roles of developing organisation image and public relations, improving quality and safety of service provision and provision of leadership. Further research to explore the underlying reasons for the above differences is needed to design appropriate professional development for China's health services managers. In addition, the importance of managerial tasks across sectors and management levels requires further investigation.

A genome-wide association study on lipoprotein (a) levels and coronary artery disease severity in a Chinese population.

Lipoprotein (a) [Lp(a)] is a genetically determined risk factor of coronary artery disease (CAD). Previous genome-wide association studies (GWASs), which were mostly carried out in Caucasians, have identified many Lp(a)-associated SNPs. Here, we performed a GWAS on Lp(a) levels and further explored the relationships between Lp(a)-associated SNPs and CAD severity in 1,403 Han Chinese subjects. We observed that elevated Lp(a) levels were significantly associated with the increased synergy between percutaneous coronary intervention with TAXUS and cardiac surgery (SYNTAX) score and the counts of heavily calcified lesions and long-range lesions (LRLs; P < 0.05), which are defined as lesions spanning >20 mm. Moreover, we identified four independent SNPs, namely, rs7770628, rs73596816, and rs6926458 in LPA, and rs144217738 in SLC22A2, that were significantly associated with Lp(a) levels. We also found that rs7770628 was associated with high SYNTAX scores [odds ratio (OR) (95% CI): 1.37 (1.05-1.80), P = 0.0213, false discovery rate (FDR) = 0.0852], and that rs7770628 and rs73596816 were associated with high risk of harboring LRLs [OR (95% CI): 1.53 (1.17-2.01), P = 0.0018, FDR = 0.0072 and 1.72 (1.19-2.49), P = 0.0040, FDR = 0.0080, respectively]. Our study was a large-scale GWAS to identify Lp(a)-associated variants in the Han Chinese population. Our findings highlight the importance and potential of Lp(a) intervention and expand our understanding of CAD prevention and treatment.

Psychological violence against general practitioners and nurses in Chinese township hospitals: incidence and implications.

BACKGROUND: International reports indicating that around 10-50% of health care staff are exposed to violence every year; in certain settings, this rate might reach over 85%. Evidence has shown that people who experience psychological violence are seven times as likely to be victims of physical violence. Although there have been numerous studies on WPV in general hospitals, there is no consensus regarding the current status of psychological violence directed at health care workers in township hospitals in China. The purpose of this study was to estimate the prevalence and the risk factors of psychological violence in Chinese township hospitals. METHODS: A retrospective cross-sectional survey of township hospitals general practitioners and general nurses was conducted in Heilongjiang Province, China.Descriptive analyses and binary logistic regression analysis were used to estimated the prevalence and the risk factors of psychological violence. RESULTS: Regardless of whether the assessment period was the past 12 months, past 36 months, or during their entire career,GPs and nurses reported that verbal abuse was the most common type of psychological violence (28.05, 30.28, 38.69 and 40.45%, 43.86, 54.02%).The main perpetrator was patients' relatives. Most participants responded to violence with "pretend nothing happened", 55.63% of GPs and 62.64% of nurses reported that the perpetrator received no punishment. Around 47.62% of respondents reported that their workplace had no procedures for reporting violence. When workplaces did have a reporting system, 57.73% knew how to use them. Only 36.98% had training in managing aggression and violence. General nurses, individuals 35 years or younger, those with higher professional titles and who work in shifts are at greater risk of psychological violence. CONCLUSIONS: Our results indicate a high prevalence of psychological violence in Chinese township hospitals, which can no longer be ignored. Effective measures should be taken to prevent and respond to workplace violence(WPV), especially psychological violence. TRIAL REGISTRATION: (Project Identification Code: HMUIRB20160014), Registered May 10, 2016.

MicroRNA-140-5p attenuated oxidative stress in Cisplatin induced acute kidney injury by activating Nrf2/ARE pathway through a Keap1-independent mechanism.

Oxidative stress was predominantly involved in the pathogenesis of acute kidney injury (AKI). Recent studies had reported the protective role of specific microRNAs (miRNAs) against oxidative stress. Hence, we investigated the levels of miR140-5p and its functional role in the pathogenesis of Cisplatin induced AKI. A mice Cisplatin induced-AKI model was established. We found that miR-140-5p expression was markedly increased in mice kidney. Bioinformatics analysis revealed nuclear factor erythroid 2-related factor (Nrf2) was a potential target of miR-140-5p, We demonstrated that miR-140-5p did not affect Kelch-like ECH-associated protein 1 (Keap1) level but directly targeted the 3'-UTR of Nrf2 mRNA and played a positive role in the regulation of Nrf2 expression which was confirmed by luciferase activity assay and western blot. What was more, consistent with miR140-5p expression, the mRNA and protein levels of Nrf2, as well as antioxidant response element (ARE)-driven genes Heme Oxygenase-1 (HO-1) and NAD(P)H:quinone oxidoreductase l (NQO1) were significantly increased in mice kidney tissues. In vitro study, Enforced expression of miR-140-5p in HK2 cells significantly attenuated oxidative stress by decreasing ROS level and increasing the expression of manganese superoxide dismutase (MnSOD). Simultaneously, miR-140-5p decreased lactate dehydrogenase (LDH) leakage and improved cell vitality in HK2 cells under Cisplatin-induced oxidative stress. However, HK2 cells transfected with a siRNA targeting Nrf2 abrogated the protective effects of miR-140-5p against oxidative stress. These results indicated that miR-140-5p might exert its anti-oxidative stress function via targeting Nrf2. Our findings showed the novel transcriptional role of miR140-5p in the expression of Nrf2 and miR-140-5p protected against Cisplatin induced oxidative stress by activating Nrf2-dependent antioxidant pathway, providing a potentially therapeutic target in acute kidney injury.

Perceptions of patient safety culture among healthcare employees in tertiary hospitals of Heilongjiang province in northern China: a cross-sectional study.

OBJECTIVE: Assessing the patient safety culture is necessary for improving patient safety. Research on patient safety culture has attracted considerable attention. Currently, there is little research on patient safety culture in China generally, and in Heilongjiang in northern China specifically. The aim of the study is to explore the perception of healthcare employees about patient safety culture and to determine whether perception differs per sex, age, profession, years of experience, education level and marital status. DESIGN: Cross-sectional study. SETTING: Thirteen tertiary hospitals in Heilongjiang, northern China. PARTICIPANTS: About 1024 healthcare employees. MAIN OUTCOME MEASURE: The perception of healthcare employees was measured using the safety attitude questionnaire, which include six dimensions. Higher scores represented more positive attitudes. An analysis of variance was used to compare socio-demographic differences per position, marital status and education; t-tests were used for sex, age and experience. RESULTS: A total of 1024 (85.33%) valid questionnaires were returned. The mean score of the six dimensions was 73.74/100; work conditions (80.19) had the highest score of all the dimensions, and safety climate (70.48) had the lowest. Across distinct dimensions, there were significant differences in perceptions of patient safety culture per sex, age, years of experience, position, marital status and education level (P < 0.05). CONCLUSIONS: The findings can help in assessing perceived patient safety culture among healthcare employees and identifying dimensions that require improvement. Interventions aimed at specific socio-demographic groups are necessary to improve patient safety culture.

Persistently elevated sFlt-1 and recovery of reduced ADAMTS13 activity in malignant hypertension.

BACKGROUND AND OBJECTIVES: Malignant hypertension (MHT) characterized by acute hypertension with retinopathy or multiorgan damage, is a severe form of hypertensive emergency and associated with target organ involvement and poor kidney outcome. However, the underlying mechanisms are unclear. METHODS: Eighty-four patients with acute severe hypertension from the Nephrology Department and Emergency Department in a single center during January 2016 and December 2017 were prospectively enrolled and divided into MHT ( n  = 48) and non-MHT ( n  = 36) subgroups according to target organ evaluation. Forty healthy controls were recruited. Serum soluble Fms-like tyrosine kinase-1 (sFlt-1) levels and plasma ADAMTS13 (a disintegrin and metalloprotease with thrombospondin type 1 motif, member 13) activity were examined at baseline and 12-month follow-up. Renal endpoints were defined as a significant decrease in the estimated glomerular filtration rate (eGFR) of more than 40% or the occurrence of end-stage renal disease. RESULTS: Serum sFlt-1 levels were persistently elevated in MHT. Baseline serum sFLT-1 levels were correlated with plasma ADAMTS13 activity and markers of target organ damage. Plasma ADAMTS13 activity was reduced in both MHT and non-MHT patients and recovered to the normal range at 12-month follow-up. During an average follow-up time of 53 ±â€Š13 months, the restoration of reduced ADAMTS13 activity was correlated with the improvement of kidney function and independently reduced the risk of renal endpoints. CONCLUSIONS: Abnormal angiogenesis and endothelial damage are involved in the pathophysiology of hypertensive emergency. Evaluation of ADAMTS13 and sFlt-1 may help in the diagnosis and assessment of MHT. Recovery of ADAMTS13 predicts better renal outcome in patients with hypertensive emergencies.

An electrochemical ratiometric immunosensor for the detection of NMP22 based on ZIF-8@MWCNTs@Chit@Fc@AuNPs and AuPt-MB.

Nuclear matrix protein 22 (NMP22) is one of the most important tumor markers of bladder cancer and is significantly elevated in the urine of bladder cancer patients. Therefore, in this work, a highly sensitive ratiometric electrochemical immunosensor was constructed to detect NMP22 based on ZIF-8@MWCNTs@Chit@Fc@AuNPs composites. ZIF-8 had a large surface area and good adsorption ability. Multi-Walled Carbon Nanotubes (MWCNTs) can optimize the electrical conductivity of ZIF-8, so that the electrode surface of ferrocene (Fc) obtains a stable and strong electrochemical signal. In addition, AuPt-MB provided another strong detection signal methylene blue (MB) while immobilizing the secondary antibody (Ab2) through Au-N and Pt-N bonds. A ratiometric electrochemical sensor was formed based on ZIF-8@MWCNTs@Chit@Fc@AuNPs and AuPt-MB, which showed a great linear connection between IMB/IFc and the logarithmic concentration of NMP22 with a detection limit of 3.33 fg mL-1 (S/N = 3) under optimized specifications in the concentration interval of 0.01 pg mL-1 to 1000 ng mL-1. In addition, the ratiometric immunosensor showed good selectivity and stability.

Survivin as a potential biomarker in the diagnosis of bladder cancer: A systematic review and meta-analysis.

Early detection, diagnosis, and treatment take on critical significance in preventing and treating bladder cancer. As indicated by numerous studies, survivin can serve as a biomarker of bladder cancer, whereas the results of a wide variety of studies have been controversial. This paper is to assess the accuracy of survivin in the diagnosis of bladder cancer by a meta-analysis. The studies regarding the diagnosis of bladder cancer using survivin were systematically retrieved from the CNKI, WanFang, CBM, VIP, Web of science, cochrane library and pubmed were extracted, and the literature quality was assessed. Meta-analysis was conducted using STATA 16.0 MP. 2,082 relevant studies were searched, and 40 studies were finally covered for meta-analysis. The pooled specificity and pooled sensitivity of survivin mRNA was 0.95 (95%CI: 0.91, 0.97) and 0.94 (95%CI: 0.88, 0.97). The pooled specificity and pooled sensitivity of survivin protein reached 0.95 (95%CI: 0.90, 0.97) and 0.87 (95%CI: 0.78, 0.92). The pooled positive likelihood ratio, pooled negative likelihood ratio, the area under the curve, and diagnostic odds ratio for survivin mRNA reached 17.7 (95%CI: 10.3, 30.6), 0.07 (95%CI: 0.04, 0.12), 0.98 (95%CI: 0.97, 0.99) and 266 (95%CI: 114, 621), respectively. For survivin protein was 16.4 (95%CI: 7.9, 33.9), 0.14 (95%CI: 0.08, 0.24), 0.97 (95%CI: 0.95, 0.98) and 117 (95%CI: 38, 357), respectively. Survivin takes on great significance in diagnosing bladder cancer. However, due to some limitations in the number and quality of covered studies, this conclusion should be validated through additional higher quality clinical studies.

The Impact of Government-Led Farmland Construction on Market-Oriented Farmland Transfer-Evidence from Shandong, China.

This study explored the impact of government-led high-standard farmland construction (HSFC) on market-oriented farmland transfer using a unified analysis framework of HSFC and farmland transfers. We used a binary probit model based on 660 questionnaires from five counties in Shandong Province, China to empirically analyze this impact. The results show that HSFC can significantly promote farmland lease-in while inhibiting lease-out. We found that farmland fragmentation plays a significant role in moderating this impact, which is illustrated by the fact that improved farmland fragmentation does not promote HSFC in the context of farmland lease-in. Furthermore, it can effectively alleviate the inhibitory effect of HSFC on farmland lease-out. The impact of HSFC on farmland transfer has significant labor transfer heterogeneity. For households with a low degree of labor transfer, HSFC can significantly promote farmland lease-in and inhibit lease-out, while for households with a high degree of labor transfer, the above effect is not significant.

Noncoding RNAs as a potential biomarker for the prognosis of bladder cancer: a systematic review and meta-analysis.

OBJECTIVE: The relationship between noncoding RNAs and the prognosis of bladder cancer (BC) is still controversial. The purpose of this study is to evaluate the relationship between noncoding RNAs and prognosis by meta-analysis. METHODS: Comprehensive retrieval of PubMed, Embase, the Cochrane Library, the Web of Science, CNKI, and WanFang databases is related to the correlation between noncoding RNAs and the prognosis of BC. Data were extracted, and the literature quality was evaluated. STATA16.0 served for the meta-analysis. RESULTS: 1. CircRNAs: High circ-ZFR expression led to poor overall survival (OS) of BC. 2. LncRNAs: Low lnc-GAS5 expression predicted poor OS of BC, high lnc-TUG1 expression predicted poor OS of BC. 3. MiRNAs: High miR-21 expression predicted poor OS of BC, high miR-222 expression led to poor OS of BC, high miR-155 expression predicted poor progression-free survival (PFS) of BC, high miR-143 expression caused poor PFS of BC, low miR-214 expression could result in poor recurrence-free survival (RFS) of BC. CONCLUSIONS: High circ-ZFR, lnc-TUG1, miR-222, and miR-21 expressions were correlated with poor OS of BC; high miR-155 and miR-143 expression predicted poor PFS of BC; low lnc-GAS5 expression predicted poor OS of BC; low miR-214 expression predicted poor RFS of BC.

Determination of purines in prepackaged food using optimum acid hydrolysis followed by high performance liquid chromatography.

A high performance liquid chromatography was established to determine purine content of prepackaged food. Chromatographic separation was performed on Agilent5 TC-C18 column. Ammonium formate (10 mmol/L, pH = 3.385) and methanol (99:1) were used as mobile phase. Purine concentration and peak area showed good linear relationships in the range from 1 to 40 mg/L (guanine, hypoxanthine, adenine) and xanthine exhibited a good linear relationship ranged from 0.1 to 4.0 mg/L. Recoveries of four purines ranged from 93.03% to 107.42%. Purine content in prepackaged food was following: animal derived prepackaged food: 16.13-90.18 mg/100 g; beans and bean products: 66.36-157.11 mg/100 g; fruits and fruit products: 5.64-21.79 mg/100 g; instant rice and flour products: 5.68-30.83 mg/100 g; fungi, algae, fungi and algae products: 32.57-70.59 mg/100 g. This proposed method had good precision and accuracy with a wide linear range for detection of purine. Animal derived prepackaged food was purine-rich food, purine content of plant derived prepackaged food varied greatly.

C3aR Antagonist Alleviates C3a Induced Tubular Profibrotic Phenotype Transition via Restoring PPARα/CPT-1α Mediated Mitochondrial Fatty Acid Oxidation in Renin-Dependent Hypertension.

BACKGROUND: Renin-dependent hypertension with tubulointerstitial injury remains a problem with high prevalence in the clinic. However, whether and how renin participates in tubulointerstitial injury remains incompletely understood. New evidence suggests that renin cleaves C3 into C3a and C3b. In the present study, we aimed to explore the role of renin-mediated C3a/C3a receptor (C3aR) signaling in renin-dependent hypertension-induced kidney injury and illustrate the detailed mechanisms. METHODS: C3a concentration changes in serum from healthy volunteers incubated with recombinant renin were detected by ELISA. C3aR expression in human tubular epithelial cells was evaluated in renal biopsy sections from malignant arteriolonephrosclerosis and benign arteriolonephrosclerosis patients. C3aR changes in human kidney 2 (HK2) cells were detected after the cells were treated with human serum, renin and aliskiren. The C3a analogue and C3aR antagonist SB290157 were used to stimulate HK2 cells to explore the downstream signaling of C3a/C3aR activation. For in vivo studies, two-kidney, one-clipped (2K1C) hypertensive rat model was established to simulate renin-dependent hypertension conditions. C3a and C3aR expression was detected in the clipped kidneys. SB290157 was injected intraperitoneally to block C3a/C3aR signaling in 2K1C rats. RESULTS: The results showed that renin cleaved C3 into C3a and activated C3a/C3aR signaling in tubular epithelial cells (TECs) from both humans and rats. In vitro results demonstrated that C3a/C3aR activation impaired peroxisome proliferator-activated receptor alpha (PPARα)/carnitine palmitoyltransterase-1alpha (CPT-1α)-mediated mitochondrial fatty acid oxidation (Mito FAO) in HK2 cells and induced HK2 cell transition to a profibrotic phenotype, which was inhibited by treatment with the C3aR antagonist SB290157. In vivo results showed that renin mRNA levels, C3a concentrations, C3aR levels and tubulointerstitial fibrosis increased concurrently in the clipped kidney cortex of 2K1C rats. Treatment with the C3aR antagonist SB290157 significantly mitigated the effect of renin induction of C3aR expression and alleviated renin-dependent hypertension-induced tubulointerstitial fibrosis by improving PPARα/CPT-1α-mediated Mito FAO in TECs, as well as inhibiting tubular profibrotic phenotype transition. CONCLUSIONS: Our results prove that renin activates C3a/C3aR signaling to promote renal tubulointerstitial fibrosis by impairing PPARα/CPT-1α-mediated tubular Mito FAO. SB290157 confers a potential therapeutic approach for renin-dependent hypertension-induced kidney injury.

A label-free electrochemical immunosensor for CA125 detection based on CMK-3(Au/Fc@MgAl-LDH)n multilayer nanocomposites modification.

A label-free electrochemical immunosensor was constructed for cancer antigen 125 (CA125) detection based on multiple-enlargement means of layer-by-layer (LBL) assembly of ordered mesoporous carbon (CMK-3), gold nanoparticles (Au NPs) and MgAl layered double hydroxides containing ferrocenecarboxylic acid (Fc@MgAl-LDH). A CMK-3(Au/Fc@MgAl-LDH)n multilaminate nanocomposites was designed using technology of LBL self-assembly among negatively charged Au NPs, positively charged CMK-3 and Fc@MgAl-LDH nanosheets. The CMK-3(Au/Fc@MgAl-LDH)n multilaminate nanocomposites was used as carriers to increase the immobilization of antibody and the number of loading Fc, conductors to strengthen conductivity and enhancers to amplify signal of Fc step-by-step. Besides, this special and excellent way of LBL assembly can immensely amplify the signal of immunosensor and more immobilize the biomolecules, and label-free method is a more simple the measuring way and the procedure. The immunosensor displayed a wider linear range of 0.01 U ml-1-1000 U ml-1 and a lower detection limit of 0.004 U ml-1. Therefore, the sensor can stablely and accurately be applied for CA125 detection in clinical cancer diagnosis.

Electrochemical Detection of Nuciferine in the Lotus Leaf Based on Efficient Catalysis by Zirconium-MOFs.

BACKGROUND: Nuciferine is an amorphine alkaloid in lotus leaf that has anti-inflammatory, lipid-lowering and hypoglycemic effects, so the quantitation of detected nuciferine is important. OBJECTIVE: An electrochemical method was developed for nuciferine detection based on efficient catalysis by Zr-MOFs (Metal-organic frameworks). METHODS: In this work, the ratiometric electrochemical method was developed for nuciferine detection based on efficient catalysis by Zr-MOFs. UiO66 is a Zr-MOFs nanomaterial and can absorb methylene blue (MB) by electrostatic action to form UiO66-MB nanocomposite. The UiO66-MB nanocomposite can be used as an enhancer to catalyze nuciferine decomposition and a carrier to provide a two-dimensional environment for the reaction of nuciferine. Moreover, good catalytic properties of UiO66 were first time used for the detection of nuciferine. RESULTS: This method has a linear detection range from 0.1 to approximately 20 µg/mL, and a low detection limit of 0.03 µg/mL (S/N=3). The recovery was from 98.1 to 102% and the RSD was from 0.45 to 3.65%, indicating that the proposed method can be applied for the analysis of real samples. CONCLUSION: The proposed electrochemical method can be used to detect nuciferine in lotus leaves. HIGHLIGHTS: The ratiometric electrochemical method was used for the detection of nuciferine. The MB can be used as an internal standard for anti-interference. And, UiO66 is used to catalyze the decomposition of nuciferine. Great catalytic properties of UiO66 were first time used for the detection of nuciferine.

Sandwich-type immunosensor based on COF-LZU1 as the substrate platform and graphene framework supported nanosilver as probe for CA125 detection.

CA125 is a tumor marker which mainly exists in ovarian, the detection for it with high sensitivity is conducive to improve the effectiveness of tumor prevention and control at early state. Multi-layer graphene oxide derivatives from graphene, and has poor conductivity and high stacked properties that limit its further application. Multi-layer reduced graphene oxide frame (MrGOF) was composed of single-layer graphene sheet and exhibited 3D structure with good dispersion, better conductivity and electrochemical properties after multi-layer graphene oxide underwent alkaline peeling and thermally reduction, the modified graphene are easy to load and combine functional groups and metal nanoparticles. Covalent organic frameworks (COFs) presents a stable frame and through covalent bond connection and has porous properties to adsorb biomolecules, which allows the immobilization of antibody molecules by the porosity and improve the sensitivity of the detection in sensing field. Through the adsorption of COFs for antibody and the probe labeled with functional graphene, we constructed a sandwich type immunosensor with the new material COF-LZU1 as the platform to anchor the CA125 first-antibody and MrGOF combined with amino group and loaded with silver nanoparticles (AgNPs) as the probe to detect tumor marker CA125. The linear range of detection was from 0.001 U/mL to 40 U/mL, with the detection limit was calculated to be 0.00023 U/mL (S/N =3). The prepared immunosensor showed a good application ability for real human serum, which can be attributed to the adsorption of COF-LZU1 for the CA125 first-antibody, and ability to deliver electrons and signal amplification of AgNPs anchored on the sheet structure of MrGOF.

Lead absorption capacity in different parts of plants and its influencing factors: a systematic review and meta-analysis.

People pose a serious risk by plants contaminated with lead in soil. However, the strength of lead enrichment capacity in root, stem, and leaf of the plant is still controversial. Therefore, a meta-analysis was conducted to investigate the ability of lead enrichment of root, stem, and leaf and the main influencing factors for lead absorption. The results of this study indicated that all parts of plant can significantly accumulate lead. Concentrations of lead followed an order of root > stem > leaf. Alkaline soil was conducive to the absorption of lead. When the lead concentration in the soil was higher than 20 mg/kg, the lead absorption in root was more. Lead is absorbed most in trees and least in Gramineae. It is argued that this study is beneficial to select plants suitable for absorption of lead from polluted soil. This study also can help to clarify the influencing factors for lead enrichment in different parts of the plant.