Cyanobacteria are the only prokaryotes capable of oxygenic photosynthesis, which have potential to serve as "autotrophic cell factories". However, the synthesis of biofuels and chemicals using cyanobacteria as chassis are suffered from poor stress tolerance and low yield, resulting in low economic feasibility for industrial production. Thus, it's urgent to construct new cyanobacterial chassis by means of synthetic biology. In recent years, adaptive laboratory evolution (ALE) has made great achievements in chassis engineering, including optimizing growth rate, increasing tolerance, enhancing substrate utilization and increasing product yield. ALE has also made some progress in improving the tolerance of cyanobacteria to high light intensity, heavy metal ions, high concentrations of salt and organic solvents. However, the engineering efficiency of ALE strategy in cyanobacteria is generally low, and the molecular mechanisms underpinning the tolerance to various stresses have not been fully elucidated. To this end, this review summarizes the ALE-associated technical strategies and their applications in cyanobacteria chassis engineering, following by discussing how to construct larger ALE mutation library, increase mutation frequency of strains and shorten evolution time. Moreover, exploration of the construction principles and strategies for constructing multi-stress tolerant cyanobacteria, and efficient analysis the mutant libraries of evolved strains as well as construction of strains with high yield and strong robustness are discussed, with the aim to facilitate the engineering of cyanobacteria chassis and the application of engineered cyanobacteria in the future.
Technology ; Photosynthesis/genetics* ; Cyanobacteria/genetics* ; Light ; Biofuels

Objective:To explore the effects of different ankle pump exercises on femoral vein hemodynamics and lower limb fatigue in healthy adults.Methods:From January to June 2021, 30 healthy adults who met the enrollment conditions in the First Affiliated Hospital with Nanjing Medical University were selected by convenient sampling as the research subject. Using a prospective self-contrast method, the effects of resting state, ankle dorsiflexion and plantar flexion on femoral vein blood flow in lower limbs were investigated by Doppler ultrasound. Then the subjects received two kinds of ankle exercises, the traditional method was dorsiflexion 10 s relaxation 5 s, plantar flexion 10 s relaxation 5 s; the modified method was dorsiflexion 1 s relaxation 1 s, plantar flexion 1 s relaxation 1 s. The hemodynamics of subjects were measured immediately after 5 min of exercise, 5 min of rest after exercise and 10 min of rest after exercise. And the subjective sensory fatigue scores of the subjects for different exercise modes were evaluated when the exercise lasts for 1, 3 and 5 minutes.Results:Compared with the rest state, the peak velocity, average flow velocity and blood flow of femoral vein in ankle dorsiflexion and plantar flexion were increased, and the differences were statistically significant ( P<0.01) . Compared with plantar flexion, the peak velocity, average flow velocity and blood flow of femoral vein during ankle dorsiflexion were statistically increased ( P<0.05) . There was no statistical difference in peak velocity and average velocity of femoral vein blood flow between the two ankle pump exercises at different time points ( P>0.05) . There was no statistical difference in the scores of subjective sensory fatigue after 1 and 3 min of two kinds of exercise ( P>0.05) , but the scores of subjective sensory fatigue after 5 min of traditional exercise were higher than those of modified exercise with a statistical difference ( P<0.05) . Conclusions:The effect time of ankle dorsiflexion and plantar flexion on femoral vein blood flow velocity in healthy adults is 1 to 2 seconds. The rhythms of dorsiflexion and plantar flexion of ankle pump exercise in unit time are suggested to be 1 s, which is simpler and easier than the traditional exercise. We should instruct the patient to increase the number of ankle pump exercises every day for 5 minutes or within the patient's tolerance.

Extrahepatic cholangiocarcinoma is a rare, aggressive malignancy of the digestive system with high recurrence rate and poor prognosis. With the development of modern medicine and radiotherapy technology, combined with surgery, chemotherapy, and biliary stent, etc., radiotherapy plays a more and more important role in the treatment of resectable and unresectable patients. At present, a large number of studies have shown that external beam radiotherapy, intraluminal brachytherapy, stereotactic body radiation therapy and other kinds of radiotherapy techniques have good safety and efficacy, but its clinical application is still controversial.

Development of "liquid sunshine" could be a key technology to deal with the issue of fossil fuel depletion. β-caryophyllene is a terpene compound with high energy density and has attracted attention for its potential application as a jet fuel. The high temperature and high light-tolerant photosynthetic cyanobacterium Synechococcus elongatus UTEX 2973 (hereafter Synechococcus 2973), whose doubling time is as short as 1.5 h, has great potential for synthesizing β-caryophyllene using sunlight and CO₂. In this study, a production of ~121.22 μg/L β-caryophyllene was achieved at 96 h via a combined strategy of pathway construction, key enzyme optimization and precursor supply enhancement. In addition, a final production of ~212.37 μg/L at 96 h was realized in a high-density cultivation. To our knowledge, this is the highest production reported for β-caryophyllene using cyanobacterial chassis and our study provide important basis for high-density fuel synthesis in cyanobacteria.
Biofuels/microbiology* ; Carbon Dioxide/metabolism* ; Light ; Photosynthesis ; Synechococcus/radiation effects*

Objective:To investigate the microsurgical anatomy of thoracodorsal artery perforators, and the clinical effect in repairing the soft tissue defect of hand with the thoracodorsal artery perforator flap (TAP).Methods:From October, 2014 to November, 2014, the axillary arteries in 10 thoracodorsal specimens were perfused with red latex. The number and diameter of the perforators of the thoracodorsal arteries were mearsured. From January, 2015 to February, 2019, 52 cases of soft tissue defects in hand combined with bone and extensor tendon exposure were repaired with TAP. The patients were followed-up in outpatient department to observe the clinical efficacy.Results:The number of perforators of thoracodorsal artery was 2-4 mostly, and 3 perforators was the most. The diameter of perforators was 0.22-0.68 mm, and the distance between the perforating point and the posterior axillary wall was 5.2-11.8 cm. All the operations were completed successfully, and the donor sites were closed directly. In 52 cases, 48 flaps survived, 2 had partially necrosis, and 2 had completely necrosis. The patients were followed-up for 5 to 24 months. The blood supply of the flaps was good with soft texture and good appearance.Conclusion:The TAP is an ideal flap because of its thin in thickness, concealed donor area and no obvious scar after direct suture.

Objective? To construct the "Internet +" based health management model for physical examination population. Methods? From September 2016 to September 2017, we constructed the primary"Internet +" health management model by literature review. Two rounds of consultation with 25 experts were carried out with the Delphi method to construct the "Internet +" health management model for physical examination population. Results? Among two rounds of consultation, the recovery rate of questionnaire was all 100%. The expert authority coefficient (Cr) was 0.87. The final "Internet +" health management model included 3 first-level indicators, 7 second-level indicators and 26 third-level indicators. Conclusions? The "Internet +"based health management model is reliable which can be intervention for health management model of physical examination population.

Objective To investigate whether the amount of blood transfusion affects the lengths of stay (LOS),costs,and outcomes of hospital patients or not,and to prepare for the execution of patient blood management.Methods The data of hospital patients,who had been administrated with blood in our hospital during 2016,were collected.And the influence of blood transfusion volume on LOS,costs and outcomes of patients was analyzed retrospectively.Results LOS,costs and outcomes of patients vary significantly with the amount of blood transfusion (P＜0.01).There were positive correlations between the total amount of blood transfusion and LOS,costs,and outcomes of patients.The Spearman correlation coefficient was 0.317,0.497,0.290,respectively (P＜0.01).Plasma preparation transfusion volume has a great influence on LOS,costs,and outcomes than red blood cell (P＜0.05).The transfusion volume of death patients was significantly higher than that of the survival (P＜0.01).In particular,the amount of transfused plasma and precipitation was distinctly higher than that in death patients(P＜0.01).Conclusion Blood transfusion volume affects LOS,costs and outcomes of hospital patients.The administration of plasma preparations should deserve more attention.

ObjectiveTo investigate the expression change of cathepsin B (CathB) in the ventroposterior nucleus (VPN) of the ipsilateral thalamus after cortical infarction in rats.MethodsThe adult male Sprague-Dawley rats were randomly divided into either a sham operation group or a model group.The latter was further divided into postoperative 1-, 2-, 3-, 4-, and 8-week groups.A model of cerebral cortical infarction was induced by electrocoagulation the cortical branch of middle cerebral artery.Immunohistochemical staining and immunofluorescence were used to detect the protein expression and cellular localization of CathB in the VPN at each time point.ResultsThe expression level of VPN CathB in thalamus increased gradually after cerebral cortical infarction.It reached the peak at 4 weeks, and decreased at 8 weeks, however it was still higher than the control group (all P<0.05).The release of CathB from the lysosomes into the cytoplasm were found.In addition, the expression level of CathB in the activated astrocytes was significantly increased at 3 weeks after cerebral cortical infarction.ConclusionsDuring 1-8 week after cerebral cortex infarction, CathB in the VPN of the ipsilateral thalamus maintained higher expression level, suggesting that it might play a certain role in secondary degeneration in the thalamus after cerebral cortical infarction.

Objective To study the curative effect and prognosis of malignant pleural effusion treated by staphylotoxoid injection and its effect on immune system.Methods A total of 65 patients with malignant pleural effusion from August 2012 to 2014 November in Lishui City Central Hospital were selected,and divided into observation group(n=33) and control group (n=32) in terms of different treating methods,two groups were implemented with thoracic closed drainage to drain pleural effusion up.The observation group was completely drained after 2 500 U intrapleural injection of staphylotoxoid injection,the control group to the traditonal method of bleomycin 1 mg/kg injection.The efficacy,prognosis and immune system were compared.Results The effective of rate of the observation group was significantly higher(72.7%) than the control group(43.8%);the adverse reaction rate of observation group was lower and its median survival time was longer;white blood cells counts of observation group was significantly more than control group ( P<0.05).Conclusion Compared with the traditional method of bleomycin intrapleural injection treatment of malignant pleural effusion, staphylotoxoid injection can be more effective control of the disease , reduce adverse reactions, and can improve their immunity and improve the body tolerance .

Objective To investigate the effects of erythropoietin (EPO) on myocardial apoptosis and protein kinase B (AKT) expression in rats of chronic heart failure (CHF). Methods Thirty male adult SD rats were randomly divided into two groups, sham-operated (Sham) group (n=6) and model (Model) group (n=24). The abdominal aortic coarctation was used to build CHF model. Sixteen survived rats after operation were randomly divided into two groups including EPO group and con-trol (Control) group. EPO group was received 3 000 U/kg EPO intraperitoneal injection 3 times/week for 4 weeks, and Sham group and Control group were received same volume of normal saline. The echocardiography was used to evaluate cardiac function after 4 weeks, 8 weeks and 12 weeks of treatment. After 12 weeks, all rats were sacrificed after 24 h fasting. The cell morphology and myocardial apoptosis were observed, and apoptosis index (AI) was calculated. Myocardial P-AKT/AKT pro-tein expression was detected by Western blot assay. Results Echocardiography showed that ventricular hypertrophy was found in model group after four weeks, heart failure 8 weeks. Compared with Control group, left ventricular ejection fraction (LVEF) was significantly higher after EPO intervention for 4 weeks (P < 0.05), systolic interventricular septum thickness (IVSs), end-systolic left ventricular posterior wall thickness (LVPWs), diastolic interventricular septum thickness (IVSd), af-ter left ventricular end-diastolic wall thickness (LVPWd) were significantly lower (P<0.05). The value of AI was significant-ly lower in EPO group than that of Control group (23.87%±1.45%vs 35.58%±2.81%, P<0.01). The OD value of P-AKT/AKT was significantly decreased in Control group (0.35±0.06) than that of Sham group (0.81±0.17), the value was significant-ly increased in EPO group (1.61±0.16) than that of Control group (P<0.01). Conclusion EPO can improve heart function, inhibit myocardial apoptosis,and promote pro-phosphorylation of AKT in rats with chronic heart failure.