In 2010, the artificial synthesis of Mycoplasma mycoides triggers the new era of synthetic biology. This great breakthrough is achieved mainly thanks to the powerful DNA recombinant ability of yeast. In recent years, except for the methods used for large DNA assembly on the basis of in vivo homologous recombination, various different DNA assembly methods in vitro, based on the concept of DNA ligation or polymerization, have also been developed, such as Biobrick\BglBrick, SLIC and Gibson one-step assembly. Application of these new technologies has greatly accelerated the construction of synthetic part libraries, biosynthetic pathway and even microbial chromosomes. In fact, all DNA assembly methods are derived from the combinations of DNA joining and organizational schemes. This review describes the brief introduction of the main in vivo and in vitro DNA assembly protocols developed so for, which will benefit the construction of different types of synthetic functional devices and also biosynthetic pathways in the research of synthetic biology in China.
DNA ; biosynthesis ; chemistry ; genetics ; DNA, Recombinant ; biosynthesis ; genetics ; Genetic Engineering ; methods ; Metabolic Networks and Pathways ; Synthetic Biology ; methods

Objective To study the relationships between androgen receptor (AR)expression and the clinicopathological features and prognosis of young patients (age≤35 years)with early-onset breast cancer in Xinjiang.Methods One hundred and forty-five young patients (age≤35 years)with invasive breast cancer who underwent surgery in Affiliated Cancer Hospital of of Xinjiang Medical University from January 201 0 to December 201 2 were collected.The expressions of AR in 1 45 patiens with early-onset breast cancer were detec-ted by immunohistochemical method.The relationships between AR expression and the clinicopathological fea-tures and prognosis of patients with early-onset breast cancer were retrospective analysed.Results The posi-tive rate of AR expression of patients with early-onset breast cancer in Xinjiang was 69.0% (1 00 /1 45).Single factor analysis showed that AR expression was related with neurovascular invasion (χ2 =5.309,P =0.021 ) and lymph node metastasis (χ2 =6.073,P =0.01 4),but it was not related with ethnicity (χ2 =0.097,P =0.755),age (χ2 =0.045,P =0.831 ),feeding history (χ2 =0.066,P =0.797),family history of cancer (P =0.556),histological grade (P =0.469),tumor size (χ2 =1 .006,P =0.605)and clinical stage (χ2 =4.381 ,P =0.223).The median follow-up time was 47 months.There was no significant difference between AR expression and disease-free survival of patients with early-onset breast cancer (χ2 =1 .972,P =0.1 60). Conclusion Early-onset breast cancer patients with AR positive are more likely to appear lymph node metasta-sis and neurovascular invasion than the patients with AR negative,which has certain guidance means for the treatment of early-onset breast cancer with lymph node metastasis positive.

ObjectiveTo observe the short-term and long-term efficacies of acupuncture at phenomaxillary ganglia in treating allergic rhinitis.MethodThe recruited subjects were intervened by acupuncture at phenomaxillary ganglia, once a week and 6 times asa treatment course. Visual Analogue Scale (VAS) was adopted to evaluate the general condition and nasal symptoms, and the Rhinoconjunctivitis Quality of Life Questionnaire (RQLQ) was used to estimate the quality of life (QOL). The evaluations were performed before and after intervention, as well as 2 years after the intervention.ResultThe subjects all had significant improvements in the clinical symptoms after 6 sessions, and the VAS scores of the general conditional nasal symptoms and RQLQ score were significantly decreased (P<0.01); in the follow-up study conducted 2 years later, except for the scores of the non-nasal/eye symptoms, all symptoms scores were significantly lower compared to that before intervention (P<0.05,P<0.01), and the results were insignificantly different from that after intervention (P>0.05).ConclusionAcupuncture at phenomaxillary ganglia is effective in treating allergic rhinitis, and the efficacy lasts stably within 2 years.

Objective To evaluate Feridex(superparamagnetic iron oxide,SPIO)enhanced MRI in the diagnosis of hepatic lesions.Methods Feridex-enhanced MRI was performed in 31 patients with CT,or MRI proved or suspected hepatic lesions.T 2WI signal intensity of hepatic parenchyma,lesion and background noise was measured before and after enhancement separately.SNR and CNR of parenchyma and lesion before and after enhancement were calculated.The number of lesions on plain and enhanced scans were observed and alalyzed.Results Post-enhancement SNR of liver significantly decreased (?0.05).Post-enhancement lesion-liver CNR increased significantly (?

Objective To investigate the correlation and clinical diagnosis significance between ultrasound elastography and the distribution of myofibroblast in breast tumor.To assess the value of ultrasonic elastography and myofibroblast in the diagnosis of breast cancers.MethodsThree-hundred and fifteen patients recruited from May 2009 to November 2010 were divided into benign group and malignant group according to postoperative pathological diagnosis results considered as gold standard.The clinical value of the score of ultrasonic elastography was evaluated.The expression levels of CD34 and α-SMA protein in breast tissues were examined by immunohistochemistry.ResultsThe difference was statistically significant for the expression level of CD34 and α-SMA between malignant breast tumor patients compared with benign ( P ＜0.05).The expression level of CD34 was lower,but α-SMA was higher in the patients of breast cancer compared with benign tumor.However,the expression level of CD34 and α-SMA was just the opposite in the patients of benign tumor.The expression level of CD34 was the negative correlation with the elastography score ( P ＜0.05) in the breast tumor,but α SMA just the opposite situation.Conclusions The score of ultrasound elastography can represent MFS distribution characteristics in breast tumors in the result that α-SMA +/CD34- can determine the existence of myofibroblast.

Objective To observe the effect of postoperative analgesia for cesarean section with a new approach to transversus abdominis plane block.Methods 40 ASA physical status Ⅰ to Ⅱ patients undergoing cesarean section firstly were rucruited.All the patients were randomly divided into the two groups,20 cases in each group.A standard subarachnoid block was used.Group A:TAP block was performed at the end of surgery by piercing the transversus abdominis muscle from inside the abdominal wall at the midaxillary line at the level of the umbilicus with a 22-gauge blunt needle.The patients were assigned to receive 20mL of 0.298％ ropivacaine on each side of the abdominal wall.Group B:the patients were also assigned to receive normal saline.Sufentanil was used for postoperative analgesia by PICA.Each patient was assessed at 2,4,8,24 hours postoperatively using a visual analog scale,the dosage of analgesic drug and the adverse reactions.Results Compared with group B,group A had significantly lower pain scores at 2,4 hours using a visual analog scale (P ＜ 0.05) and there were no significant differernces in 8,24 hours(P ＞ 0.05).The cumulative sufentanil requirement of group A was also significantly lower at all time points (P ＜ 0.01).The incidence of sedation of the two groups were also significant differernces,eg.nausea and vomiting (15％/25％),itchy skin(5％/20％),dizziness(0/10％) (P ＜ 0.05).Conclusion This new approach to transversus abdominis plane block provides effective postoperative analgesia after cesarean section.

Objective To design a device sampling Korotkoff's sound signal and acquiring blood pressure based on Korotkoff theory.Methods The author sampled Korotkoff's sound signal via microphone,and then according the cuff pressure corresponding to signal appearance and disappearance,the author acquired SBP and DBP.At last,the author validated the creditability by contrasting with the results of auscultatory method.Results The difference of SBP and DBP is near nonexistence,the blood pressure data using this device is creditable.Conclusion The blood pressure can be measured using this device,and it can be used to further study the auto-measurement of blood pressure base on Korotkoff's sound theory.

ObjectiveTo investigate the effects of topiramate (TPM) on complexity of electroencephalography (EEG) by means of quantitative pharmacoelectroencephalography (QPEEG) and nonlinear analysis methods.MethodsOne dose of TPM was administrated to epileptics and healthy adults. The EEG samples were obtained prior to and at regular intervals (at 0.5, 1, 2, 4, 6, 8, 12, 24 hours after the administration) within 24 hours following the administration of TPM. The EEG activity was processed with the nonlinear analysis methods. The complexity measure, approximate entropy, Lyapunov exponent and fractional dimension of the whole scalp areas were calculated through 60 seconds epochs without artifacts after each recording. The statistical difference between baseline predrug assessment and each postdrug control was described by analysis of variance.ResultsThe Lyapunov exponent was increased first, then decreased, and then increased finally (the maximum value was 0.44 in both centrals in the healthy people). The approximate entropy and fractional dimension showed the tendency of descent, the complexity measure decreased in healthy adults (the least value was 0.34 on right parietal), but increased in patients (the maximum value was 0.34 in right posterior temporal).ConclusionTPM might change the complexity of EEG.

Objective To reveal the cerebral activation areas related to semantic processing of language functions in patients with temporal lobe epilepsy(TLE).Methods 6 patients with left-TLE,6 patients with right-TLE,and 6 controls,all right-handed,were studied using functional magnetic resonance imaging(fMRI)during a reversible words decision task.Their responses were recorded by key-press.The image data was analyzed by statistical parametric mapping 2(SPM2)including the individual statistical analysis and group analysis.Results There was no difference between the right-TLE patients and controls in cerebral activation,which included left inferior frontal gyrus,left middle frontal gyrus,left superior temporal gyrus,left middle temporal gyrus and bilateral cingulate gyrus,bilateral fusiform gyrus,bilateral basal ganglia,bilateral cerebellum(especially right).The activation in patients with left-TLE was atypically distributed relative to the controls,there were more activation in right inferior frontal gyrus,right precentral gyrus and left cuneus,left precuneus.Conclusion There is atypical distribution of the cerebral activation area related to semantic processing of language functions in patients with left-TLE,and enantiomorphous transformation is found in the contrelateral side of cerebrum.

Objective To study the effect of macroporous adsorptive resins on the decoloration technology ofLonicera japonica Thunb. polysaccharides(FLP).Methods The effects of 6 kinds of macroporous adsorptive resins i.e. HPD-400A, AB-8, HPD-750, HPD-100, D3520, D301T, S8 on the decolorization technology ofLonicera japonica Thunb. polysaccharides were compared with single factor test in terms of temperature, polysaccharide concentration, pH, adsorption flow, and eluant.Results The decolorization rate and polysaccharide retention rate of S8 were optimal. The best decoloration conditions were as follows: temperature of 40℃, polysaccharide concentration of 5 mg/ml, pH value of 6, flow rate of 1 ml/min, distilled water with pH=6 as eluant. The adsorption rate was 83.2%,and polysaccharide retention rate was 72.1%.Conclusion High decolorization ratio and the high retention rate ofLonicera japonica Thunb. could be obtained by means of decoloration with S8 macroporous adsorptive resins..