"Biochemical Engineering Experiment" is a compulsory curriculum for the concentrated practical teaching of biotechnology majors in Hunan University of Science and Engineering. It is also an experimental curriculum for improving the overall quality of bioengineering students under the context of "Emerging Engineering Education". The course includes comprehensive experiments and designable experiments, and the contents of which are designed by combining the local characteristic resources of Yongzhou, the research platform and the characteristics of the talents with engineering background. In the teaching practice, methods such as heuristic teaching, research cases-embedded teaching and interactive teaching are comprehensively used to boost students' interest in learning and stimulate their innovative thinking and application capability. Through curriculum examination and post-class investigation, it was found that the students' abilities of knowledge transfer and application were significantly improved, and they achieved excellent performances in discipline competitions and approved project proposals. The practice and continuous improvement of this course may facilitate fostering high-level innovative and application-oriented talents of biotechnology majors.
Humans ; Curriculum ; Students ; Learning ; Bioengineering ; Biomedical Engineering

Objective ToinvestigatethefeasibilityofpredictingtheKi-67expressionusing MRandclinicalfeaturesofbreast cancer.Methods 52patientswith56invasivebreastcarcinomawereretrospectivelyinvestigated.Eachsubjectunderwentpresurgical breastMRI,whichincludeddynamiccontrastenhancementandDWI(b=0s/mm2,1000s/mm2).Clinicalcharacteristicsand MR findingswerecollected,includingage,ER ,PR ,HER2,tumorsize,location,number,spiculesign,lobulationsign,margin,TICandADCvalues. Ki-67expressionwasrecordedbyimmunohistochemicalstaining,whichwasdividedintohighexpression(≥20%)andlowexpression (<20%).Leastabsoluteshrinkageandselectionoperator(Lasso)wereperformedtoselectthefeaturesmostassociatedwithKi-67 expression.ThenomogramwasconstructedtopredictKi-67expression,aswellasAUCand95%confidenceinterval(CI)werecalculated.Results TICtypesandADCvaluesassociatedwithKi-67expressionwereidentifiedbyLassoregression.Thenomogram predictedthehigh andlow Ki-67expressionwithanAUCof0.827 (95% CI:0.713-0.940).TheKi-67expressionwasnegativelycorrelatedwiththe ADCvalues(r=-0.430,P=0.003).Ki-67expressionwassignificantlycorrelatedwithTICtype,andTICⅢwasmorelikelytohavehigher expressionofKi-67.Conclusion ThereisindividualandrespectivecorrelationbetweentheexpressionlevelofKi-67andTICtype, ADCvalue.TheexpressionlevelofKi-67canbepredictedtosomeextentbyADCvaluesandTICtypes.

Objective:To analyze the trend relevant factors leading to death and their patterns over a 10-year period in inpatients with connective tissue diseases (CTDs).Methods:All clinical data about death in inpatients with CTDs were retrospectively reviewed between 2005 and 2014 at the Department of Rheumatology and Immunology in Xiangya Hospital of Central South University.Results:In the 10-year time period,the overall hospital mortality was 15.689‰.The disease itself accounted for 44.71% of the total causes of death,infection accounted for 42.94%,and comorbidities accounted for 12.35%.The constituent ratio of deaths and the average hospital mortality caused by the disease itself declined gradually year by year,and the constituent ratio of deaths caused by infection and comorbidities increased gradually year by year (P<0.05).In 2013-2014,infection was the leading cause of death,which accounted for 51.06%.The survival time for CTDs inpatients with interstitial lung disease (ILD) was shorter than that of CTDs inpatients without ILD,and even the risk of death was 1.722 times of the latter.The proportion of deaths caused by the disease itself was the highest in systemic sclerosis and systemic lupus erythematosus,that by infection was the highest in idiopathic inflammatory myopathy (IIM),and that by comorbidities was the highest in rheumatoid arthritis.Conclusion:The proportion of deaths and the hospital mortality in CTDs inpatients caused by the disease itself show a declining trend,while the proportion of deaths caused by infection and comorbidities increase.CTDs patients with ILD have shorter survival time and an increase in risk of death.

Objective To investigate the expression and antibacterial function of Neutrophil extracellular traps (NETs) in systemic lupus erythematosus (SLE) patients.Methods Thirty stable SLE patients and thirty normal controls (NC) were recruited to this study.The acitivity of SLE was assessed by SLE Disease Activity Index (SLEDAI).Density gradient centrifugation was uesd to isolate neutrophilic granulocytes.Picogreen assay was used to quantify NETs formation.Colony counting method was used to compare the antibacterial rate of NETs between two groups.Variation of quantity and activities of neutrophil elastase (NE) and myeloperoxidase (MPO) on induced NETs was tested by enzyme linked immunosorbent assay (ELISA).Results There was no significant difference in the number of NETs between SLE and NC.Compared to the control group,more NETs were induced from neutrophils in SLE,the antibacterial rate of induced NETs was significantly lower,with the activities of antibacterial protein MPO decreased.Conclusions Stable SLE patients are more easily to induce NETs,and the antibacterial function of induced NETs are truly defective,may be related to the decreased activity of the antibacterial protein MPO.

Objective To investigate stilbene glycosides(TSG) and PNS concomitantly on PC12 cell survival rate of Alzheimer's disease.Methods The nerve cells that were seeded on the two culture plates were cultured for 1 day after the removal of primary culture fluid.In addition to the blank group, the model group and drug compatibility group were added 5 μl Aβ25-35 perpore to induced PC12 cell damage.To established AD cell damage model after exposure to the circumstances for 24 hours.Uniform design and factorial design were used respectively.After 1 d, using MTT method in ELISA analyzer measured the OD value of each pore, and calculating the survival rate of cells.Results The uniform design results showed that the cell survival rate was significantly linear with TSG and PNS (P＜0.05).From the equation, The higher the dose, the higher the cell survival rate.In this experimental condition, TSG and PNS respectively 50 mg/L, 200 mmol/L achieved the highest cell survival rate.2×2 factorial design experiments showed that, compared with the model group, the cell survival rate of TSG-PNS group (74.46％ ± 2.06％ vs.65.42％ ± 1.42％) increased (P＜0.05), but there was no interaction between the two groups (P=0.053).This showed that the combination of the two drugs in this dose has a protective effect on AD damage.Conclusion The compatibility of total saponins of two stilbene glucoside and three seven combination has the synergistic effect of anti AD damage.

Objective To assess the feasibility of double phase subtraction angiography with second generation (128-slice )dual-source CT in low dose Flash spiral scan mode for the evaluation of cerebral vessel,compared with dual-energy subtraction angiogra-phy.Methods 60 patients underwent double phrase CT angiography were divided into group A (n = 30,with Flash spiral scan mode),group B(n=30,with dual-energy scan mode).The signal-to-noise ratio(SNR),the contrast-to-noise ratio(CNR)and the av-erage radiation of double phrase subtraction images were measured in two groups,respectively.The double phase subtraction images quality were graded by 2 independent readers on a 5-point scale(5=excellent)in double-blind,according to various degrees of the re-sidual bones,the vessel displayed and luminal integrity,respectively.Differences between two groups were analyzed by Mann-whit-ney test and t test.Results The double phrase image SNR showed no difference to both two groups(P >0.05).The image CNR of arterial and venous phase in group A were higher than that of group B(40.89±8.89 and 40.27 ±9.90 in group A vs 35.28 ±8.43 and 34.89±8.66 in group B;P <0.05)respectively.There were no singnificant difference in the bone removal image scores of doub-le phase and in the vessel image scores of venous phase to both two groups respectively(P >0.05).The vessel image scores of arterial phase were higher in group A than that of group B(4.93±0.25 vs 3.87±0.97;P <0.05).Some internal carotid in the base of skull has not good luminal integrity in group B.The mean dose length product (DLP)in group A was lower than that of group B,with a 39 percent reduction[(226±5.69 )mGy/cm vs (368 ± 21.35 )mGy/cm,P < 0.05 ].Conclusion With the roughly similar image quality to dual-energy double phase subtraction angiography,the cerebral vessels can be assessed using dual-source CT subtraction angiography in Flash spiral scan mode and a lower radiation dose.

BACKGROUNDPreeclampsia, characterized by hypertension and proteinuria, is a multifactorial disease associated with shallow invasion of trophoblast cells and inadequate spiral artery remodeling. Trophoblast and tumor cells have similar invasion mechanism. Prostasin is closely related to tumor development, invasion and metastasis and influences blood pressure through activating epithelial sodium channel. The effect of prostasin on the pathogenesis of preeclampsia remains unclear. This study investigated the association of prostasin gene at rs12597511 with severe preeclampsia.

METHODSA single nucleotide polymorphism, rs12597511, was tested with polymerase chain reaction and restrictionfragment length polymorphism analyses in 179 severe preeclampsia patients and 222 normal pregnant women.

RESULTSThe frequencies of TC + CC genotypes were significantly higher in severe preeclampsia group compared with in control group (the adjusted odds ratio was 2.030, 95% confidence interval 1.195-3.449, P = 0.009). The C allele of rs12597511 was present significantly more often among women with severe preeclampsia (P = 0.001). Genotyping analysis showed that the C allele of rs12597511 could confer a risk for severe preeclampsia.

CONCLUSIONThe higher frequency of C allele of prostasin gene at rs12597511 is associated with severe preeclampsia.

Adult ; Female ; Gene Frequency ; genetics ; Genetic Predisposition to Disease ; genetics ; Genotype ; Humans ; Middle Aged ; Polymorphism, Single Nucleotide ; genetics ; Pre-Eclampsia ; genetics ; Pregnancy ; Serine Endopeptidases ; genetics ; Young Adult

Objective To investigate the application and effect of aerobic exercise of pulmonary rehabilitation in patients with chronic obstructive pulmonary disease (COPD).Methods Ninety-four hospitalized patients with COPD from June 2011 to June 2012 were enrolled.The clinical curative effect and safety of aerobic exercise of pulmonary rehabilitation in patients with COPD were observed and compared.Results After 3 months treatment,first second forced expiratory volume (FEV1) and forced vital capacity (FVC) were increased compared with those before treatment [(3.25 ± 0.49) L vs.(2.59 ± 0.55) L,(1.95 ± 0.41) L vs.(1.44 ± 0.48) L],and there were significant differences (P ＜ 0.05).There was no significant difference in FEV1/FVC before and after treatment (P ＞ 0.05).After 3 months treatment,arterial partial pressure of oxygen and arterial oxygen saturation were increased compared with those before treatment [(87.61 ± 8.56) mm Hg(1 mm Hg =0.133 kPa) vs.(63.88 ± 8.79) mm Hg,0.9648 ±0.0449 vs.0.7632 ± 0.0477],partial pressure of arterial carbon dioxide was decreased compared with that before treatment [(30.57 ± 9.47) mm Hg vs.(49.23 ± 9.54) mm Hg],and there were significant differences (P ＜ 0.05).There was no signifi.cant difference in blood pressure and heart rate before and after treatment (P＞ 0.05).No obvious adverse reactions were observed.Conclusions The aerobic exercise of pulmonary rehabilitation can improve significantly lung function.It is safe and rehable,and has less adverse reaction in patients with COPD.It is worthy of promotion and use.

Objective To establish the model and software for quality assessment of fetal nuchal translucency ultrasound image using computer image recognition technology.Methods The proposed approach firstly divided the input image into four sub-image blocks:the nasal bone(NB) area,the nuchal translucency (NT) area,the midbrain area,and the jaw and chest area.For each sub-image block,the algorithm compared the image block with the corresponding area of the standard training image set,and then determined whether the current image block was the qualified one using the the Gabor feature and Bayesian decision.The input ultrasound image was determined to be qualified only if it had four qualified sub-image blocks.Results The difference between our automatic method and the manual screening by experts wasting small,the method obtained Kappa =0.795 and P ＜0.001.Moreover,the efficiency of our method was much higher than the manual screening method.Conclusions Image recognition technology can effectively assist the sonographer to assess the quality of fetal NT of ultrasound image.The proposed approach can reduce the subjectivity and randomness of the manual evaluation of NT image.

Objective To assess the value of contrast enhanced ultrasound (CEUS) in diagnosing subtypes of postpartum placenta accreta.Methods 31 puerperal clinically diagnosed of postpartum placenta accreta were collected.They were inspected by using CEUS and 2-dimensional color Doppler ultrasound,respectively.The operation was used as a reference.Results Both 2-dimensional color Doppler and CEUS could identify the sizes of residual placenta for the patients,but CEUS showed more explicit boundary for placenta and uterus and the rich/poor blood flow areas in the placenta.Among the 31 patients,7,23 and 1 were classified of accreta,increta and percreta,respectively,by using 2-dimensional color Doppler ultrasound,while 11,16 and 4 were classified of accreta,increta and percreta,respectively,by using CEUS based on the myometrial thickness and contrast agent subsided time.With respect to operation,10 patients were confirmed of accrete,with the other diagnosed of increta and percreta.The misclassification rate of 2-dimensional color Doppler ultrasound was 19.6 ％,while CEUS had only 6.5 ％.CEUS had a good agreement with operation (Kappa =0.859,P ＜ 0.001).Conclusions CEUS has higher accuracy in diagnosing subtypes of postpartum placenta accrete compared with 2-dimensional color Doppler ultrasound.CEUS can increase the accuracy and reliability for diagnosing those who were clinically considered of postpartum placenta accrete,and can provide helpful guidelines for clinical treatment.