In plant genetic engineering, selectable marker is needed to distinguish transformant. As the commercialization of transgenic plants, people are more and more paying close attention to their safety, among which mainly refers to the safety of selectable marker. In order to increase the safety of transgenic plants, biologists began to search for biosafe selectable marker.Current research progress of taking key enzyme in metabolic pathways were overviewed,which include glycometabolism, amino acid metabolism, hormone metabolism ,nucleotide metabolism and protein metabolism et cetera, as selectable marker in transgenic plants.

The rodipicolinate synthase gene was cloned from Nicotiana tabacum L.cv,which encodes the key enzyme in the synthesis of lysine,and then a vitro molecular reform reliefing feedback suppression was made. Some resistant seedlings were acquired using the mutated gene as selectable marker and analog of lysine as selectable reagent,and the detection results were positive by means of PCR and Real-Time PCR,however the phenotype is somewhat abnormal.

Malignant biliary tract obstruction is a common disease.Nowadays,endoscopic biliary drainage (EBD) and percutaneous transhepatic biliary drainage (PTBD) have been used to treat such disease.EBD is a first-line intervention for lower segment of biliary duct obstruction caused by pancreatic cancer or other tumors.PTBD is a first-line treatment for gallbladder cancer or other tumors which lead to the hilar and intrahepatic bile duct obstruction and abnormal digestive anatomy.In a word,the proper selection of the drainage should be based on the patients' condition with minimal trauma and maximum therapeutic effect.

Heart ; drug effects ; Heart Failure ; drug therapy ; Humans ; Hydrogen Bonding ; Nitrogen Oxides ; pharmacology ; therapeutic use

Raman spectroscopy has generated many branches during the development for more than 90 years. Surface enhanced Raman spectroscopy (SERS) improves SNR by using the interaction between tested materials and the surface of rough metal, as to quickly get higher sensitivity and precision spectroscopy without sample pretreatment. This article describes the characteristic and classification of SERS, and updates the theory and clinical application of SERS. It also summarizes the present status and progress of SERS in various disciplines and illustrates the necessity and urgency of its research, which provides rationale for the application for SERS in microbiology.
Microbiology ; Spectrum Analysis, Raman

Water soluble extract (WSE) is an important index for the quality evaluation of Astragali Radix (AR). In this study, the WSE of the wild AR from Shanxi province (SX) and the cultivated AR from Gansu Province (GS) were compared. The WSEs of two types of AR were determined according to the appendix of Chinese pharmacopoeia. Then the WSEs were subjected to NMR analysis, and the obtained data were analyzed using HCA, PCA, OPLS-DA, microarray analysis, and Spearman rank analysis. In addition, the Pearson correlation of differential metabolites were also calculated. The results showed that the WSE content of GS-AR (37.80%) was higher than that of SX-AR (32.13%). The main constituent of WSE was sucrose, and other 18 compounds, including amino acids, organic acids, were also detected. Multivariate analysis revealed that SX-AR contained more choline, succinic acid, citric acid, glutamate, taurine and aspartate, while GS samples contained more sucrose, arginine and fumaric acid. In addition, the Pearson correlations between different metabolites of the two types of AR also showed apparent differences. The results suggested that the WSE of two types of AR differs not only in the content, but also in the chemical compositions. Thus, the cultivation way is important to the quality ofAR. This study supplied a new method for the comparison of extract of herbal drugs.

ObjectiveTo investigate the effect of ulinastatin on perioperative renal function in patients undergoing orthotopic liver transplantation.MethodsSixty ASA Ⅱ or Ⅲ patients of both sexes aged 35-64 yr weighing 50-75 kg with normal blood urea nitrogen (BUN) and creatinine (Cr) before operation undergoing orthotopic liver transplantation were randomly divided into 2 groups ( n ＝ 30 each):control group (group C) and ulinastatin group ( group U).Anesthesia was induced with midazolam,fentanyl,etomidate and vecuronium and maintained with isoflurane inhalation,propofol TCI,continuous remifentanil infusion and intermittent iv boluses of fentanyl and vecuronium.The patients were tracheally intubated and mechanically ventilated.PET CO2 was maintained at 30-35 mm Hg.Ulinastatin 400 000 IU in normal saline 20 ml was infused iv after induction of anesthesia.Ulinastatin 200 000 IU was then infused every 4 h until 48 h after operation.Urine volume and the amount of furosemide administered were recorded before anhepatic phase,and during anhepatic and neohepatic phase.Venous blood samples and urine were collected before induction of anesthesia (T1),at 15 min of anhepatic phase ( T2 ),at 15min of neohepatic phase (T3),at the end of operation (T4) and 48 h after operation (T5) for determination of serum concentrations of BUN,Cr and creatinine clearance rate and urinary N-acetyl-beta-D-glucosaminidase (NAG)activity and microalbumin concentration.ResultsCompared with group C,ulinastatin significantly decreased the amount of furosemide administered and increased urine volume during anhepatic and neohepatic phase,decreased serum Cr concentration,increased creatinine clearance rate at T2.5,decreased urinary NAG activity and microalbumin concentration at T4.5 and serum BUN concentration at T3-s.ConclusionUlinastatin has protective effect on rehal function during perioperative period in patients undergoing orthotopic liver transplantation.

Objective To discuss the role of miRNA-374a in invasion and metastasis of breast cancer.Methods Breast tissues from 48 patients(32 patients with breast cancer)were classified into high invasive and metastatic group(HIMG,group A),low invasive and metastatic group(LIMG,group B),and normal group (group C).Each group contained 16 specimens.6 samples were selected randomly from each group and were detected by microRNA array.Key microRNA (miRNA-374a)was selected and its target protein(BMP-2) was predicted by bioinformatics software.The rest 10 specimens of each group were detected by real-time qRT-PCR and Western blot to test the content of miRNA-374a,mRNA and protein of BMP-2.Correlation analysis was performed between miRNA and the target protein.SPSS 18.0 was used to make statistical analysis.Results The relative content of miRNA-374a was higher in group C than in group B,higher in group B than in group A(P ＜ 0.05).BMP-2 mRNA level was higher in group A and group B than in group C (P ＜ 0.05).The expression level of BMP-2 protein was lower in group C than in group B,lower in group B than in group A(P ＜0.05).Correlation analysis showed that miRNA-374a was negatively correlated with BMP-2 protein(P =-0.412 8).Conclusion miRNA-374a inhibits the invasion and metastasis by regulating BMP-2 in human breast cancer.

Objective To compare the cardiac function parameters in gated SPECT determined by filtered back projection (FBP) and OSEM reconstruction methods. Methods One hundred and forty-four patients underwent 99Tcm-MIBI gated-SPECT imaging studies. The parameters LVEF, EDV and ESV, were derived using quantitative gated SPECT (QGS), four-dimensional model SPECT (4D-MSPECT) and emory cardiac toolbox (ECToolbox) softwares. Each image was reconstructed by FBP or OSEM. Bland-Altman analysis and paired t-test were applied to evaluate those parameters. Results Correlation coefficients for LVEF, EDV and ESV between FBP and OSEM methods were all more than 0.93 (all P<0.001). EDV calculated by FBP was lower than that by OSEM using QGS software, but became the opposite when using 4D-MSPECT and ECToolbox softwares. (QGS: (82.2±39.1) ml vs (83.5±40.8) ml, t=-2.53, P<0.05; 4D-MSPECT: (93.5±46.9) ml vs (88.8±45.2) ml, t=5.95, P<0.01; ECToolbox: (106.4±51.1) ml vs (100.8±49.0) ml, t=3.99, P<0.01). ESV calculated by FBP was higher than that by OSEM using 4D-MSPECT software (4D-MSPECT:(37.5±41.4) ml vs (34.8±37.6) ml, t=3.92, P<0.01). LVEF calculated by FBP was lower than that by OSEM using QGS software ((62.1±16.9)% vs (63.1±16.1)%, t=-3.14, P<0.05), but higher than that by OSEM using ECToolbox software ((74.1±18.8)% vs (71.3±17.1)%, t=5.28, P<0.01). Conclusion Generally, cardiac functional parameters based on FBP and OSEM construction methods correlated well, although they might have singnificantly different results.