Metagenomic insight into the bioaugmentation mechanism of Phanerochaete chrysosporium in an activated sludge system treating coking wastewater.

Phanerochaete chrysosporium was seeded to a sequencing batch reactor treating phenol wastewater. Compared to the contrast reactor (R1), the bioaugmented reactor (R2) exhibits better performance in sludge settling ability, as well as biomass and phenol removal, even though the added fungus is not persistently surviving in the reactor. Bioaugmentation improved bacterial population, growing up to 10,000 times higher than that of eukaryotes. Metagenomic sequencing results show the bioaugmentation finally increases bacterial and eukaryotic richness, but reduces their community diversity. In contrast to R1, bacterial distribution in R2 is more concentrated in Proteobacteria. The relative abundances of filamentous fungi, yeast and microalgae in R2 are all higher than those in R1 at different treatment phases, and two reactors are finally dominated by different protozoan and metazoan. In conclusion, P. chrysosporium improves reactor performances by influencing microbial community structure, and this phenomenon might be attributed to the ecological competition in sludge and toxicity reduction of phenol wastewater. The novelty of this study emphasizes why a species which is not persistently active in bioreactor still plays a crucial role in enhancing reactor performance. Results obtained here impact the conventional criteria for selection of bioaugmentation microbes used in activated sludge systems.

Experiment study on influence of outward development training on psychological resilence and subjective well-being among college students with civil aviation specialty / 重庆医学

Objective To investigate the influence of outward development training on psychological tenacity and subjective well‐being among college students with civil aviation specialty ,in order to provide the theoretically supported coping model and in‐tervention mechanism for improving the mental health level of college students .Methods Totally 139 college students of aviation safety technological management specialty were selected as testees ,including 72 individuals in the experiment group and 67 individu‐als in the control group .The experiment group adopted the outward development training for conducting intervention ,while the con‐trol group conducted the arrangement at the corresponding time period according to the college management .Both two groups were measured by using the Psychological Resilience Scale for Adolescents and the Happiness Index Scale before and after the outward development training intervention .Then the scores in the two groups were compared between before and after intervention . Results The factor scores ,total score of the Psychological Resilience Scale and the total happiness index before intervention had no statistical difference between the two groups (P>0 .05) .The 3‐factor scores of interpersonal assistance ,active cognition and emo‐tional control ,and total happiness index after the outward development training intervention were risen ,showing statistical differ‐ence compared with before intervention (P0 .05) .The fac‐tor scores ,total score of the Psychological Resilience Scale and the total happiness index at corresponding time in the control group had no statistical difference between before and after intervention (P>0 .05) .The 3‐factor scores of interpersonal assistance ,active cognition and emotional control ,and the total happiness index after intervention had statistical differences between the two groups (P 0 .05) .Conclusion Conducting the outward development training could effectively promote the shaping and fostering of psychological resilience and subjective well ‐being among college students of civil aviation specialty .

The acceleration of sludge granulation using the chlamydospores of Phanerochaete sp. HSD.

In the present paper, a novel method to accelerate sludge granulation is presented. Inoculation with chlamydospores of Phanerochaete sp. HSD accelerated sludge granulation during the treatment process of phenol wastewater, and the sludge granulation rate reached 66 ± 2% on day 7, 32 days earlier than that of the control inoculated with activated sludge only. Aerobic granule in R1 (AG(R1)) showed an annual ring-like multilayer structure and a primary core also existed in the nuclear area of the granule. The mechanism of rapid granulation revealed that the chlamydospore could survive in phenol wastewater and form the primary matrix on which aerobic granule was developed layer by layer. In addition, AG(R1) developed in a phenol uptake system to counteract the adverse effects of phenol inhibition. Higher tolerance toward wastewater with high phenol strength was exhibited, and the maximum specific phenol degradation rate reached 1.54 g phenol g(-1) VSS day(-1).

Improvement of the production of a red pigment in Penicillium sp. HSD07B synthesized during co-culture with Candida tropicalis.

Co-culture of Penicillium sp. HSD07B and Candida tropicalis resulted in the production of a red pigment consisting of six components as determined by TLC and HPLC. The pigment showed no acute toxicity in mice and was mot mutagenic in the Ames test. The pigment was stable between pH 2 and 10 and temperatures of 10-100°C and exhibited good photo-stability and resistance to oxidization by hydrogen peroxide and reduction by Na(2)SO(3). Glucose and ratio of C. tropicalis to strain HSD07B (w/w) in the inoculum were the important factors influencing production of the pigment. Under optimized conditions, a pigment yield of 2.75 and 7.7 g/l was obtained in a shake-flask and a 15 l bioreactor, respectively. Thus, co-culture of strain HSD07B and C. tropicalis is a promising way to produce a red pigment potentially useful for coloring applications.

Rhinoplasty of wide and bulbous nasal tip with a piece of septal cartilage as septal extender / 中华医学美学美容杂志

Objective To evaluate the role of autologous septal cartilage in the rhinoplasty of the wide and bulbous nasal tip. Methods A big piece of autologous nasal septal cartilage was removed and transplanted to the front of nasal septum, acting as a septal extender to fix the nasal alar cartilage,and then the shape of nasal tip was reconstructed by middle crus suture technique, excessive soft tissue under skin of tip and a part of lateral crura cartilage were removed to stand out the shape of the nasal tip. Results After one year follow-up, 118 of 126 cases achieved satisfied effects, but 8 cases dissatisfied because of their undue thick skin. Conclusions This method is reliable in the correction of the wide and bulbous nasal tip.

The Analysis of Fatty Acids of Dry-Thallus High-Yield ofArachidonic Acid Producing Strain byGas Chromatography and Mass Spectrometry / 分析化学

A high-yield arachidonic acid producing strain (mortierella alpina) was selected with ion implantation. After treating the dry-thallus of high-yield arachidonic acid-producing strain with BF3-CH3CH solution, the fatty acid in dry-thallus of arachidonic acid producing strain were analyzed by gas chromatography and mass spectrometry. The result showed that there were saturated and unsaturated fatty acids in the dry-thallus. The relative content of arachidonic acid is 70.2% in the all fatty acids. In addition, there were oleic acid, linoleic acid and γ-linolenic acid in the dry-thallus.