Evaluation the role of soluble microbial products for denitrification sludge characteristic under starvation stress.

Physiological changes with the assist role of soluble microbial products (SMP) of preserved denitrifying sludge (DS) undergoing long-term stress of starvation under different storage temperature is extremely important. In this study, SMP extracted from DS were added into DS in starvation condition under room temperature (15-20 °C), 4 °C and -20 °C with three different bio-augmentation phases of 10, 15 and 30 days. Experimental results showed that added SMP in room temperature was optimal for preservation of DS under starvation stress with optimized dosage of 2.0 mL mL-1 sludge and bio-augmentation phase of 10 d. SMP was more effective in maintaining the specific denitrification activity of DS, and it was nearly boosted to 94.1 % of control one due to assist of 2 times SMP addition with 10 days interval of each. Under assist of SMP, extracellular polymeric substances (EPS) secretion was enhanced as the defense layer to withstand starvation stress, and the protein may be utilized as an alternative substrate to gain energy, accelerate electron transport and transfer during denitrification process. This investigation revealed the feasibility of SMP as an economical and robust strategy for preservation of DS.

Decoding the response of complete autotrophic nitrogen removal over nitrite (CANON) performance and microbial succession to hydrazine and hydroxylamine: Linking performance to mechanism.

The influence of hydrazine (N2H4) and hydroxylamine (NH2OH) on performance and microbial community structures of complete autotrophic nitrogen removal over nitrite (CANON) process were assessed in this study. Experimental results demonstrated that CANON process was successfully started up and got total nitrogen removal efficiency (TNRE) of 53.6 % ± 9.8 % and 56.4 % ± 6.5 % under 1.0 and 0.5 mg L-1 N2H4 and NH2OH, respectively. N2H4 and NH2OH promoted activity of ammonia-oxidizing bacteria (AOB) and anaerobic ammonium oxidation bacteria (AnAOB), and inhibited activity of nitrite-oxidizing bacteria (NOB). Meanwhile, the stable operation of CANON process could be maintained without N2H4 auxiliary. While, performance assisted by NH2OH was fluctuated without NH2OH addition, suggesting that both N2H4 and NH2OH had a persistent and reversible inhibition on NOB. This study reveals new insights into influence of N2H4 and NH2OH on CANON performance.

Optimised architecture-based grading system as an independent prognostic factor in resected lung adenocarcinoma.

AIMS: Considering morphological heterogeneity of lung adenocarcinoma (LUAD) and no objective prognostic grading system existing currently, we aim to establish an 'optimised architecture-based grading system' (OAGS) to predict prognosis for resected LUAD. METHODS: A multicentral study involving three independent cohorts of LUAD was conducted. Predictive ability of the OAGS for recurrence-free probability (RFP) and overall survival (OS) was assessed in training cohort (n=228) by the area under the receiver operating characteristic curve (AUC), Harrell's concordance index (C-index) and Kaplan-Meier survival analyses, which was validated in testing (n=135) and validation (n=226) cohorts. RESULTS: The OAGS consists of: grade 1 for lepidic, papillary or acinar predominant tumour with no or less than 5% of high-grade patterns (cribriform, solid and or micropapillary), grade 2 for lepidic, papillary or acinar predominant tumour with 5% or more of high-grade patterns, and grade 3 for cribriform, solid or micropapillary predominant tumour. In all stages, the OAGS outperformed the pattern-dominant grading system and IASLC grading system for predicting RFP (C-index, 0.649; AUC, 0.742) and OS (C-index, 0.685; AUC, 0.754). Multivariate analysis identified it as an independent predictor of both (RFP, p<0.001; OS, p<0.001). Furthermore, in pT1-2aN0M0 subgroup, the OAGS maintained its ability to predict recurrence (C-index, 0.699; AUC, 0.769) and stratified patients into different risk groups of RFP (p<0.001). These results were confirmed in testing and validation cohorts. CONCLUSIONS: The OAGS is an independent prognostic factor and shows a robust ability to predict prognosis for resected LUAD.

Highly fluorescent N doped C-dots as sensor for selective detection of Hg2+ in beverages.

In this work, nitrogen doped carbon dots (NCDs) were synthesized through one step hydrothermal reaction using citric acid and ethylenediamine as precursors. The prepared NCDs exhibit high quantum yield of 67.4%, good stability, excellent selectivity and sensitivity. It was found that the NCDs have potential as a fluorescence sensor for the detection of Hg2+. Under optimal conditions, good linearity between the change in NCDs fluorescence intensity and Hg2+ concentration was obtained in the range of 0.3 to 2.0 µM with a detection limit at 0.24 µM. The possible detection mechanism was static quenching of NCDs by Hg2+. The established method was successfully applied to the determination of Hg2+ in beverage samples. The results indicated that the NCDs-based sensor has potential for detection of Hg2+ in real beverage sample.

Knowledge of and willingness to promote advanced care planning among oncology nurses in southwest China.

BACKGROUND: Nurses feature prominently in promoting advance care planning (ACP), but only a limited amount of relevant research has been conducted from the nurses' viewpoint, and little is known about the nurses' knowledge of and their willingness to promote ACP in China. AIMS: The aims of this study were to investigate oncology nurses' knowledge of and their willingness to promote ACP, and to explore associated factors. METHODS: A multi-centre study was conducted to investigate 350 nurses in the oncology departments of four university hospitals in southwestern China. Cluster sampling was used in data collection, which involved three categories of questionnaires concerning demographic characteristics, knowledge about ACP and willingness to promote ACP. Chi-squared tests and multiple linear regression were employed in data analysis. RESULTS: Some 293 valid questionnaires were collected, among which, 60.1% of respondents never received palliative care education, 89.1% never received training about ACP and 72.7% had not even heard of ACP. Nurses with higher position titles (χ2=18.41, p<0.001) and longer working experience (χ2=12.25, p=0.001) were more likely to have received palliative care education; nurses with higher educational background levels (χ2=12.91, p<0.001), higher position titles (χ2=9.77, p=0.003) and longer working experience (χ2=7.92, p=0.006) were more likely to have learned about ACP; nurses with higher position titles had more access to relevant training (χ2=5.10, p=0.03). Furthermore, whether the nurse had 'heard about ACP' (B=3.113, p=0.018) and 'received training about ACP' (B=3.894, p=0.04) were both associated with their willingness to promote ACP. CONCLUSIONS: The findings of this study indicated that oncology nurses were highly inclined to promote ACP, but limited by their lack of knowledge and understanding of it. Therefore, a systematic and adequate training programme about ACP for nurses is an urgent requirement to effectively enhance the implementation of ACP in China.

Genotypic variants at 2q33 and risk of esophageal squamous cell carcinoma in China: a meta-analysis of genome-wide association studies.

Genome-wide association studies have identified susceptibility loci for esophageal squamous cell carcinoma (ESCC). We conducted a meta-analysis of all single-nucleotide polymorphisms (SNPs) that showed nominally significant P-values in two previously published genome-wide scans that included a total of 2961 ESCC cases and 3400 controls. The meta-analysis revealed five SNPs at 2q33 with P< 5 × 10(-8), and the strongest signal was rs13016963, with a combined odds ratio (95% confidence interval) of 1.29 (1.19-1.40) and P= 7.63 × 10(-10). An imputation analysis of 4304 SNPs at 2q33 suggested a single association signal, and the strongest imputed SNP associations were similar to those from the genotyped SNPs. We conducted an ancestral recombination graph analysis with 53 SNPs to identify one or more haplotypes that harbor the variants directly responsible for the detected association signal. This showed that the five SNPs exist in a single haplotype along with 45 imputed SNPs in strong linkage disequilibrium, and the strongest candidate was rs10201587, one of the genotyped SNPs. Our meta-analysis found genome-wide significant SNPs at 2q33 that map to the CASP8/ALS2CR12/TRAK2 gene region. Variants in CASP8 have been extensively studied across a spectrum of cancers with mixed results. The locus we identified appears to be distinct from the widely studied rs3834129 and rs1045485 SNPs in CASP8. Future studies of esophageal and other cancers should focus on comprehensive sequencing of this 2q33 locus and functional analysis of rs13016963 and rs10201587 and other strongly correlated variants.

[Applicable value of ultrasound-guided renal biopsy in diagnosis of kidney diseases].

OBJECTIVE: To explore the applicable value of ultrasound guidance in percutaneous renal biopsy. METHODS: 168 patients with kidney diseases underwent ultrasound-guided renal biopsy. Pathological examination was conducted. Predictors of successful rate were assessed by multivariate logistic regression analysis. RESULTS: Successful biopsy was achieved in 157 of the 168 patients with a success rate of 93.45%. Satisfying results were obtained from 143 of the 157 samples and normal renal tissues were reported in 14 samples. No serious adverse events were observed in this study. The successful biopsy rate of female patients was 89.16%, significantly lower than that of the male patients (97.65%, P < 0.05). Age, puncture times, thickness of renal cortex, and type of clinical diagnosis were not significantly correlated with the successful rate of biopsy. CONCLUSION: Ultrasound-guided renal biopsy is a kind of safe diagnostic method for kidney disease. The successful rate of renal biopsy in females is lower than that in males.

[Study on the stability of pesticide WDG suspension by TURBISCAN LAB].

TURBISCAN LAB has been applied to analyze the stability of pesticide WDG (water dispersible granule)suspension. With the application of poly (styrene sulfonic acid -co- acrylic acid) sodium salt dispersant made by ourselves in a formula of 75 wt% tribenuron WDG, and by measuring the change in the intensity of transmission and backscattering light in pesticide WDG suspension with time, the dynamic sedimentation process of pesticide WDG suspension with time can be described in-situ, reflecting the stability of pesticide suspension system. It was found that when the contents of polymer dispersant were about 6 wt% in the WDG, and the average molecular weight was about 15 000, the stability of WDG suspension system was relativelygood. Through studying the thickness of sedimentation, the settling rate of particles, the particle size, and the increasing rate of particle diameter in the suspension system in various kinds and contents of polymer dispersant, it has been made more convenient and efficient to sift the accessory ingredient in the formula of dosage form as well as to optimize the formula of pesticide WDG.