Nanoscale biomaterials,due to their excellent mechanical,chemical and biological properties,are now being applied in regenerative medicine.Nanoscale materials incorporation into 3D synthetic organ scaffolds has had a breakthrough in tissue engineering.This review provides an update report on the use of nanomaterials in 3D scaffolds of tissue engineering,including fabrication methods of 3D scaffolds of nanomaterials and their physicochemical properties,biocompatibility and degradability.

In recent years,Scientists paid close attention to the studies and applications of tissue-engineered trachea,which have made some advances.But how to promote tissue-engineered trachea for clinical application still needs deeper research.Here we discussed from three key aspects of tissue-engineered trachea (Scaffold,Cell,Bioreactor),which attempted to retrospect the current progress in tissue-engineered trachea and provided a guidance of further investigations.

In recent years, scientists paid close attention to the studies of 3D printing in cardiovascular tissue engineer-ing, which has made some advances.But how to promote cardiovascular tissue engineering for clinical application still needs deeper research.Here we discussed from three cardiovascular tissues ( myocardial tissue, heart valves, coronary) , which at-tempted to retrospect the current progress of 3 D printing in cardiovascular tissue engineering and provided a guidance of further investigations.

Converting two poorly water-soluble crystalline drugs to co-amorphous drug systems by ball milling, quench-cooling, or cryo-milling method can improve stability of the drug, enhance dissolution rates, and reduce adverse reactions of the single drug. Co-amorphous system has been used to solve problems of co-administration of medicines. Formation and intermolecular interactions of co-amorphous drug systems may be verified by differential scanning calorimetry (DSC), X-ray powder diffraction (XRPD), Raman spectroscopy (RS) and Fourier transform infrared spectroscopy (FT-IR). Stability of co-amorphous drug systems is influenced by their glass transition temperature (Tg) and intermolecular interactions. The theoretical Tg values and the interaction parameter x are calculated by Gordon-Taylor equation and the Flory-Huggins equation, respectively. Thus, co-amorphous drug systems are analyzed theoretically at molecular level. Co-amorphous drug systems provide a new sight for the co-administration of medicines.

Objective To map the approximate transcription initiation site of STK11/LKB1 and identify its potential promoter region. Methods All reported transcripts of STK11/LKB1 were colllected through searching online database. The “first exon”, “first intron” and 5' UTR upstream gDNA sequence of STK11/LKB1 were analysed by MethPrimer and FiretEF to predict the CpG island and possible transcription initiation site, respectively. The STK11/LKB1 gDNA sequence was also analysed by softwares such as PromoterInspector to predict the probable promoter region. Results Among all the reported transcripts of STK11/LKB1, 5'UTR of BC007981 was the longest. STK11/LKB1 gene was a typical CpG island associated gene. There was no exon in the upstream region of the “first exon”, and 5'UTR in BC007981 was close to transcription initiation site. Promoters were predicted in the BC007981 5' upstream 200～400bp region. Conclusion The 5'UTR of STK11/LKB1 approaches the transcription initiation site. The transcription initiation site of STK11/LKB1 gene in several hundreds bp region of 5'UTR upstream may be indentified. The data will benefit further research on the trascriptional regulation of STK11/LKB1 through experimental methods.

Objective To establish the quality standard for Yanyan syrup. Methods Thin layer chromatography ( TLC) was used for the qualitative identification of Puerariae Lobatae Radix and Scrophulariae Radix. High performance liquid chromatography (HPLC) was used to determine the content of puerarin on Diamonsil C18(200 mm×4.6 mm,5μm) column with mobile phase consisting of methanol-0.5% acetic acid (25:75) at a flow rate of 1.0 mL?min-1.The detection wavelength was set at 250 nm. Results TLC spots were clear and well-separated without negative interference.The linear range of puerarin was 3-120μg?mL-1( r=0.999 7) with an average recovery of 97.44% ( RSD=2.07%,n=6) . Conclusion The method for quality and quantity of Yanyan syrup is simple, specific, accurate and reliable.It can be used for the quality control of Yanyan syrup.

Objective To investigate the factors that influence the fermentation process of compound Chinese medicine and determining the optimum fermentation with single factor experiment and response surface methodology. Methods Through controlling the factors in the fermentation process of compound Chinese medicine (such as fermentation bacteria, fermentation time, fermentation temperature, inoculum amount, etc.), with its increase rate of total peak area as evaluation indicator, the alcohol extracts before and after fermentation were monitored and comparative evaluated by HPLC, and the optimum fermentation process was determined by response surface methodology. Results The fermentation process optimized by single factor experiment and response surface methodology was as follows:SZ-2 strain served as the fermentation bacteria, temperature was 33 ℃, inoculum amount was 4%, and time was 3.5 d, the average increase rate of total peak area was 31.24%. Conclusion HPLC can be used to identify and evaluate the fermentation of compound Chinese medicine under the different factors, and to clarify the optimal fermentation process by response surface methodology, which provide reference for the development of fermentation process.

Objective Response surface methodology ( RSM ) was applied to optimize the ultrasonic extraction conditions for flavonoids from Coreopsis tinctoria Nutt. Methods The influence factors of ultrasonic extraction were evaluated using the Box-Behnken central component experiments and analyzed by RSM. Results The optimum extraction conditions were confirmed as follows:extraction time 30. 0 min, ratio of liquid to solid 21∶1, concentration of ethanol 60%. The yield of flavonoids under this condition was (4.65±0.036)% (n=3). Conclusion The flavonoids could be extracted with stability and higher yield from Coreopsis tinctoria Nutt under optimized conditions.

Objective To study the role of IL 12 and IL 13 mRNA in children with asthma. Methods Use of semi quantitative RT PCR, IL 12 and IL 13 mRNA in peripheral blood mononuclear cell (PBMC), as well as total IgE in serum from children with asthma, which is in the period of acute phase, were detected. Results Compared with control group, The expression level of IL 12 mRNA were decreased and that of IL 13 mRNA were increased in asthmatic children; The sicker the patient was, the lower expression of IL 12 mRNA, the higher expression of IL 13 mRNA; No matter how the IgE level was, there was significantly different between the expression of IL 12 and IL 13 mRNA. Conclusion IL 12 and IL 13 may be one of the factors causing bronchial chronic inflammation.

Objective To summarize the causes of death and to analyze the risk factors in a surgical intensive care unit (SICU).Methods The relevant information of patients died in the SICU of Xijing Hospital of Fourth Military Medical University in past 15 years (from December 1999 to February 2015) was retrospectively analyzed.The gender,age, reason and date of hospitalization, date of transfer SICU, past medical history, whether or not admitted directly from emergency department, or transferred from other department, operated or not, date of death, the main cause of death, acute physiology and chronic health evaluation Ⅱ (APACHE Ⅱ) score, the history of undergoing mechanical ventilation, continuous renal replacement therapy (CRRT), or antifungal therapy, as well as the ratio of the patients with body temperature higher than 39 ℃, white blood cell (WBC) count higher than 10 × 109/L, platelet (PLT) count below 100 × 109/L, albumin (Alb) below 35 g/L of two periods, namely from December 1999 to July 2007 (the first period),and from August 2007 to February 2015 (the second period) were compared.The above parameters were compared with those of 201 survivors in SICU, and the risk factors leading to death were analyzed by logistic regression.Results From December 1999 to February 2015, 4 317 patients were taken care of in the SICU.Among them, the number of death was 186, and the mortality rate was 4.3％.In the first time period (from December 1999 to July 2007), the total number of patients was 1 356, and the number of death were 109 (the mortality rate was 8.0％).In the second period, i.e.from August 2007 to February 2015, the number of SICU patients was 2 961, and 77 died (the mortality rate was 2.6％).The difference of mortality rate between the two periods was statistically significant (x2 =66.707, P =0.001).The death rate of patients transferred directly from emergency department in tle first period was 79.8％ (87/109), and it was lower in the second period (51.9％, 40/77, x2 =16.181, P =0.001).The death rate of the patients with blood Alb below 35 g/L in the second period (59.7％, 46/77) was higher than that of the first period (41.3％, 45/109, x2 =6.151, P =0.017).The top three causes of death from December 1999 to February 2015 were sepsis (38.2％), trauma (16.7％), and operation for cancer (14.0％).In the first period, the top three causes of death were sepsis (35.8％), trauma (22.0％),and operation for cancer (13.8％).In the second period, the top three causes of death were sepsis (41.6％), damage of the central nervous system (16.9％), and operation for cancer (14.3％).Top three reasons for SICU admission were trauma (29.03％), abdominal pain (20.97％) and other reasons (18.82％).Top three departments from which the patients were transferred were the emergency department (19.35％), orthopedics department (17.20％), and hepatobiliary department (16.13％).Logistic regression analysis showed that age [odds ratio (OR) =2.025, 95％ confidence interval (95％CI) =1.500-2.734, P =0.000], mechanical ventilation (OR =3.514, 95％CI =1.701-7.259, P =0.001), CRRT (OR =5.604,95％CI =3.003-10.459, P =0.000), body temperature higher than 39 ℃ (OR =1.992, 95％CI =1.052-3.771, P =0.034) were the risk factors of death in SICU patients.Conclusion Sepsis and severe trauma are the leading causes of death in severe SICU patients, to whom with risk factors of death enough attention should be given.