A system of detection for ECG signal based on virtual instrument and LabVIEW is introduced.The conception of virtual instrument,ECG amplifier data acquisition(DAQ) and the data procession software are expounded.The system has the function of real-time displaying the ECG,data acquisition and Heart Rate Variability(HRV) analysis.

[Objective] To obtain the tyrosine decarboxylase gene (tyrDC) from Aristolochia contorta Bge.and to assay its cDNA sequence and homologous analysis, thus to remove its nephrotoxieity. [Methods] The primers designed by referring to the conservative amino acid sequences of known plant tyrDC were used to amplify a fragment of cDNA from Aristolochia contorta Bge.by reverse transcription-polymerase chain reaction (RT-PCR). The amplified cDNA sequence was cloned and sequenced to design a pair of specific primers and to amplify a full-length tyrDC cDNA from Aristolochia contorta Bge.by rapid amplification of cDNA ends (RACE). [Results] The length of cloned tyrDC cDNA is 1678 base pairs (bp), which comprises an open reading frame ( ORF) of 1551 bp encoding 516 amino acids and a downstream untranslated region (3'UTR) of 127 bp. The results of sequence comparison indicated that the amino acid sequence deduced from the nucleotide sequence of tyrDC from Aristolochia contorta Bge.shares 76% homology with issued tyrosine decarboxylase of Papaver somniferum L. and 79% homology with tyrosine /DOPA decarboxylase from Thalictrum flavum subsp. glaucum. [Conclusion] The full-length tyrDC cDNA has been amplified from Aristolochia contorta Bge. and the homologous retrieve of tyrosine decarboxylase reveals an extensive sequence similarity among tyrosine decarboxylases of different plants. This will provide evidence for the romoval of nephrotoxicity of Aristolochia contorta Bge. .

[Objective] To explore the culture conditions of inducing callus from tissue of Aristolochia contorta Bge (ACB). [Methods] The leaves of ACB were used as the explants. Basic medium (including 1/2 MS medium, MS medium and modified MS medium) containing corresponding phyto-hormones was applied for the induction of ACB callus. The influerices of different culture conditions such as three kinds of basic medium, different pH values and addition of different kinds of phyto-hormones at different concentrations into the basic medium respectively or simultaneously, on the callus induction of ACB were observed. [Results] (1) After the three kinds of basic medium were added with the phytohormones of 0.1mg/L kinetin (KT) and 0.2mg/L ?-naphthalene acetic acid (NAA) , a large amount of ACB calluses were induced in the MS medium and modified MS medium, while ACB calluses did not occur in the 1/2 MS medium. (2) When the pH value of the culture medium composed of modified MS medium and 0.1mg/L KT and 0.2mg/L NAA was at 5.8, 7.0 and 8.0, a large amount of ACB calluses were induced in the medium with pH value being 7.0 and 8.0 while a few calluses occurred in the medium with pH value being 5.8. (3) ACB calluses were induced in modified MS medium with NAA added , but calluses did not occur in modified MS medium with KT added. When the modified MS medium was added with different kinds of phyto-hormones at different concentrations, ACB calluses were loose in the medium with high-concentration NAA and this did not benefit to the differentiation of buds for too fast cell division, and the callus induction rate was low in the medium with low-concentration NAA. The optimized culture medium was modified MS medium with 1mg/L KT and 0.5mg/L NAA added. [Conclusion] The optimum culture conditions of inducing callus from ACB tissues are: MS medium or modified MS medium with 1mg/L KT and 0.5 mg/L NAA added being the culture medium, and pH value being 7.0-8.0.

Objective To analyze and compare the effect of early minimally invasive surgical treatment and conventional treatment for patients with severe acute pancreatitis.Methods According to the including criteria,eight randomized-controlled trials of this topic were enrolled into the analysis.The detail about the trial design,characters of the subjects and results of the studies were reviewed and analyzed by using Revman 4.2 software.Results Compared with conventional treatment,early minimally invasive surgical treatment was associated with a significantly lower incidence of mortality(RR=0.35,95%CI:0.20～0.63,P

In anesthetic clinical teaching,Dalian Medical University Department of Anesthesiology pays more attention to humanity education and keeps improving teaching methods.It also adopts the methods of “the combination of the virtual and reality”,multiple apprentices,PBL and other ways to enhance students' operational skills development and promote their clinical thinking.

0.05). The vanadium and titanium contents in surface water were higher than those in ground water (P

Objective To construct a DNA vaccine capable of expressing S gene of hepatitis B virus(HBV) and evaluate the expression of recombinant S gene in vitro and in vivo. Methods A cloned S X gene fragment was inserted into a eukaryote expression vector to construct a recombinant plasmid. The S gene was transcribed in vitro and expressed in a transfected cell line, and the efficiency of HBsAg in eliciting anti HBs was evaluated in mice. Results The expression of S gene was confirmed by Northern blotting, Western blotting, and ELISA(for both antigen and antibody detection). Conclusions The recombination and expression of S gene is achieved successfully in vitro.

The bovine basilar artery vascular smooth muscle cells(BAVSMC S) were isolated and cultured.The effects of chitosan and enalaprilat on the proliferation of BAVSMC S induced by angiotensin Ⅱ(AngⅡ) were evaluated with MTT method,the DNA synthesis in BAVSMC S was measured by thymidine incorporation and total protein of BAVSMC S was detected by coomassie brilliant blue method.The results showed that chitosan can inhibit the proliferation of BAVSMC S induced by AngⅡ in a time and concentration dependent manner,and depress thymidine incorporation of BAVSMC S induced by AngⅡ in a concentration dependent manner chitosan can reduce the content of protein in BAVSMC S induced by AngⅡ.These findings suggested that chitosan is capable of producing an inhibitory effect on proliferation of bovine basilar artery vascular smooth muscle cells induced by AngⅡ .

Objective To explore the feasibility of utilizing the cytosine deaminase A (CodA) gene as an effective negative selectable marker in Artemisia annua for gene targeting.Methods The PCR procedure was employed to amplify CodA gene from Escherichia coli.After being cloned and sequenced, the gene was inserted into a plant expression vector, pROKⅡ, and then introduced into Agrobacterium tumefaciens LBA4404 (pAL4404).The leaf disks of A.annua were transformed by the co-cultivation protocol, after which the transformed calli were selected and green shoots of A. annua were regenerated on N6 medium supplemented with 25 ?g/mL Kanamycin (Kan).Then the Kan-resistant transgenic shoots were transplanted onto the MS medium containing 500 ?g/mL 5-fluocytosine (5-FC) plus 25 ?g/mL Kan and continuously cultured for up to two weeks.Results The transgenic shoots have totally died while untransformed shoots still kept normal growth, indicating that A.annua cells introduced into the CodA gene had conferred an expected negative selection phenotype.When detected by RT-PCR, the transgenic shoots displayed a CodA-positive amplified band, but untransformed shoots gave no such CodA-specific amplified pattern.This result suggested that CodA gene had transcribed into corresponding mRNA in A.annua cells with furtherly verifying the result of phenotypic assay.Conclusion The CodA gene can be utilized as an effective negative selectable marker in A.annua for gene targeting.