Objective Study the production of the?-lactamases in eight pan-resistant citrobact- er freandi and their epidemic characteristics.Methods Modified Hodge test and EDTA-disk syner- gy test were used to screen Metallo-?-lactarnases,and isoelectric focusing to estimate the production of ESBLs and AmpC enzymes.ESBLs,AmpC,MBL genes were amplified and analyzed by PCR and DNA sequencing.Molecular epidemics were investigated by PFGE.Results All the 8 strains pro- duced TEM-1,CTX-M-14,4 of them at the same time producing CTX-M-3.No Plasmid mediated AmpC was found.Furthermore,a new subtype of MBL with one amino acid different from IMP-8 was de- tected.All the 8 strains belong to the same PFGE type.Conclusions Pan-drug-resistant citrobacter freundi produced more than one kind of?-lactamases.All these isolates were clonally related.

PcoI-PcoR is a quorum-sensing (QS) system influencing the biofilm formation and rhizosphere colonization in Pseudomonas fluorescens 2P24. The expression of the pcoI, a N-acyl-homoserne lactone (AHL) biosynthase gene, is under the regulation of a number of chromosomal factors, such as the GacS-GacA two-component system. In this paper, we investigated the upstream regulators that influence the transcription of pcoI gene using a chromosomal pcoI-lacZ fusion reporter strain PM203. Cosmids containing genomic DNA of the wild-type strain 2P24 were introduced into the reporter strain PM203 (gacA—, pcoI-lacZ) to screen positive transcriptional regulators of pcoI gene. One of them named pP32-24, which contained a 5-kb Pst I functional fragment was selected. Further analysis identified that the pcoI was the gene responsible for the increase of the pcoI-lacZ expression. The expression of pcoI-lacZ reporter was alsoimproved in both PM101 (pcoI-lacZ) and its gacAmutant PM203 after addition of exogenous AHL, indicating that the expression of pcoI is positively regulated by AHL (autoinduction) in strain 2P24. In addition, deletion mutagenesis and complementation experiments demonstrated that the transcriptional regulator PcoR positively controlled the expression of pcoI and the formation of biofilm. These results suggest that, in strain 2P24, the expression of PcoI-PcoR QS system is auto-inducted, and the transcriptional factor PcoR is involved in the regulation of pcoI transcription and the biofilm formation.

Objective To study the effect of trachea intubation and mechanical ventilation on the prognosis and discharge rate of patients with successful cardiac-pulmonary resuscitation.Method The clinical data of 389 patients,who were admitted from January 2005 to February 2007,were retrospectively analyzed.The relation between trachea intubation time and discharge rate was studied.According to the time from cardiac arrest to finishing trachea intubation,patients were divided into group A (within 3 minutes,n=209) and group B (over 3 minutes,n=143);according to the time from reaching emergency medicine department to finishing trachea intubation,the rest patients were divided into group C (within 5 minutes,n=9) and group D (over 5 minutes, n=38) minutes.The discharge rate was calculated between groups.The software of SPSS 11.0 was used for statistical analysis.Results The successful rate was 9.75% (389/3988),and 59 patients were discharged, with discharge rate 1.48% (59/3988).The discharge rate of group A was 19.62% (41/209),and was significantly higher than that of group B 6.99 % (10/143) (P

OBJECTIVETo compare the effect of laparoscopic radical operation and open operation on systemic immunity in patients with colorectal cancer.

METHODSSixty patients with colorectal cancer were randomly divided into laparoscopic and open operation groups from March 2004 to December 2004, each group had 30 cases. CRP, IgA, IgM, IgG, CD3 (+) cells, CD4 (+) cells, CD8 (+) cells, NK cells, CD4 (+) CD5RA (+) cells, CD4 (+) CD45RO (+) cells and lymphocytes in peripheral blood were counted and compared on the 1st day before operation, 3rd and 7th day after operation.

RESULTSThe two groups were comparable as for age, tumor location and stages. In open operation group, lymphocyte counts were (1.09+/- 0.29) x 10(9)/L, CD4 (+) cell (0.54 +/- 0.14) x 10(9)/L, CD8 (+) cell (0.31 +/- 0.08) x 10(9)/L, CD4 (+) CD45RO (+) (61.1+/- 8.9)%, and IgM level (136.9+/- 52.8) IU/ml, IgG (115.2 +/- 45.7) IU/ml on the 3rd day after operation, CD8 (+) cell counts were (0.32 +/- 0.09) x 10 (9)/L, CD4 (+) CD45RO (+) cell (63.2 +/- 9.1)% on the 7th day after operation, were all significantly lower than those on the 1st day before operation respectively(P< 0.05, P< 0.01). In laparoscopic operation group, the decreases of such parameters except CD4 (+) CD45RO (+) cell (62.7 +/- 12.5)% were not obvious on the 3rd day after operation. There were significant difference in lymphocyte counts (1.29 +/- 0.37) x 10( 9 )/L, IgM (164.5 +/- 48.2) IU/ml and CD8 (+) cell counts (0.38 +/- 0.09) x 10 (9) /L on the 3rd day after operation between two groups (P< 0.05).

CONCLUSIONCompared with open radical operation, laparoscopic radical operation has predominance in protecting systemic immunity to treat colorectal carcinoma.

Aged ; CD4-CD8 Ratio ; CD4-Positive T-Lymphocytes ; immunology ; Colorectal Neoplasms ; immunology ; surgery ; Female ; Humans ; Killer Cells, Natural ; immunology ; Laparoscopy ; Lymphocyte Count ; Male ; Middle Aged

Abstract: Objective　To understand the distribution and drug resistance of bacteria in clinical blood culture specimens in Ningxia in recent years, and to provide a basis for the prevention and treatment of bloodstream infection diseases. 　　　Methods　The blood culture isolation bacteria and drug resistance of Ningxia bacterial resistance monitoring network hospitals from 2018 to 2020 were statistically analyzed by WHONET5.6 software. Results　In the past three years, a total of 6 757 strains of bacteria were isolated from blood samples, including 3 697 strains (54.7%) of gram-negative bacteria and 3 060 (45.3%) of gram-positive bacteria. Among the gram-negative bacteria, Escherichia coli (2 074 strains,30.7%), Klebsiella pneumoniae (696 strains), Pseudomonas aeruginosa (139 strains), and Acinetobacter baumannii (121 strains). Among the gram-positive bacteria, coagulase-negative Staphylococcus (1 691 strains,25.0%), Staphylococcus aureus (442 strains), Streptococcus spp. (431 strains), Enterococcus spp. (379 strains). Resistance to Escherichia coli and Klebsiella pneumoniae was 56.6% and 22.6% against third-generation cephalosporins, and resistance to carbapenems was 1.0% and 3.7%, respectively. Pseudomonas aeruginosa and Acinetobacter baumannii were resistant to carbapenems at 9.0%（12/139） and 80.7%（71/121）. Methicillin-resistant Staphylococcus aureus (MRSA) was detected at 26.8%, methicillin-resistant coagulase-negative Staphylococcus was detected at 70%, and no Staphylococcus bacteria resistant to vancomycin and linezolid were found. For three years, only 1 strain of vancomycin-resistant Enterococcus faecalis was detected, and no linezolid-resistant Staphylococcus and Enterococcus were detected. Conclusions　Ningxia clinical blood specimen isolates of Escherichia coli, coagulase-negative Staphylococcus, and Klebsiella pneumoniae are more common. Among them, the resistance rate of Escherichia coli and Klebsiella pneumoniae to the third generation of cephalosporins is relatively stable, and the resistance rate to carbapenems is low. Acinetobacter baumannii is highly resistant to carbapenems, and methicillin-resistant Staphylococcus aureus detection rates are on the rise and should be closely monitored.

Objective To investigate the effects of angelica solution on chronic hypoxic pulmonary hypertension in rats.Methods Thirty SD rats were randomized into normoxic group,hypoxic group and angelica solution-protected group.The model of rat chronic hypoxic pulmonary hypertension was made by method of isobaric hypoxia.Angelica solution were injected before hypoxia,while the other two groups were injected normal saline.After 28d of hypoxia,pulmonary artery pressure were measured.Expressions of proliferating cell nuclear antigen (PCNA) and inducible nitric oxide synthase (iNOS) in pulmonary artery were detected by immunohistochemical staining.The index of wall thickness of rat pulmonary arteriole-percentage of the wall area in the total vascular area(wA%) were measured by a computerized image analyzer.Results The mean pulmonary artery pressure (mPAP) of normoxic group,hypoxic group and angelica solution-protected group were10.50±1.90,35.36±9.11,18.32±2.30 (mm Hg);wA% of the three groups were 52.71±5.16,82.38±8.43,64.58±9.54 (%),mPAP and wA% were significantly higher in the hypoxic group than those in the normoxic group (P<0.01) and angelica solution-protected group (P<0.01).PCNA expression of normoxic group,hypoxic group and angelica solution-protected group were 3.15±1.10,24.50±5.72,12.67±3.46 (%).The PCNA expression in the pulmonary artery was significantly higher in the hypoxic group than those in the normoxic group (P<0.01) and in the angelica solution-protected group (P<0.01).iNOS expression of normoxic group,hypoxic group and angelica solution-protected group were 2.13±1.01,17.33±3.53,37.50±7.04 (%).iNOS expression in the pulmonary artery was higher in the hypoxic group than those in normoxic group (P<0.01),and angelica significantly increased iNOS expression in comparison with the normoxic and hypoxic groups (P<0.01).Conclusion Angelica solution alleviates chronically hypoxia induced pulmonary hypertension in rats by inhibiting the espression of PCNA in pulmonary artery and up-regulating the expression of iNOS.

Adolescent ; Anti-Arrhythmia Agents ; adverse effects ; therapeutic use ; Arrhythmias, Cardiac ; drug therapy ; physiopathology ; Child ; Child, Preschool ; Female ; Follow-Up Studies ; Humans ; Infant ; Male ; Sotalol ; adverse effects ; therapeutic use ; Treatment Outcome

To collect small molecule drugs and their drug target data such as enzymes, ion channels, G-protein-coupled receptors and nuclear receptors from KEGG database as the training sets, in order to establish drug-target interaction models based on the random forest algorithm. The accuracies of the models were evaluated by the 10-fold cross-validation test, showing that the predicted success rates of the four drug target models were 71.34%, 67.08%, 73.17% and 67.83%, respectively. The models were adopted to predict the targets of 26 chemical components and establish the compound-target-disease network. The results were well verified by literatures. The models established in this paper are highly accurate, and can be used to discover potential targets in other traditional Chinese medicine ingredients.
Algorithms ; Drugs, Chinese Herbal ; pharmacology ; Gene Regulatory Networks ; drug effects ; Humans ; Ligusticum ; chemistry ; Molecular Targeted Therapy ; Rhizome ; chemistry

According to the transcriptome dataset of Panax notoginseng, the key geranylgeranyl pyrophosphate synthase gene (GGPPS) in terpenoid backbone biosynthesis was selected to be cloned. Using specific primer pairs combining with RACE (rapid amplification of cDNA ends) technique, the full-length cDNA sequence with 1 203 bp, which containing a 1 035 bp open reading frame, was cloned and named as PnGGPPS. The corresponding full-length DNA sequence contained 2 370 bp, consisted of 1 intron and 2 exons. The deduced protein PnGGPPS contained 344 amino acids and shared more than 73% identity with GGPPS from Ricinus communis and Salvia miltiorrhiza. PnGGPPS also had specific Aspartic acid enrichment regions and other conserved domains, which belonged to the Isoprenoid-Biosyn-C1 superfamily. The quantitative real-time PCR showed that PnGGPPS expressed in different tissues of 1, 2, 3 years old root, stem, leaf and 3 years old flower, and the expression level in 3 years old leaf was significant higher than that in other organs, which suggested that it might not only be involved in the regulation of the growth and development, but also be associated with the biosynthesis of chlorophyll and carotenoids, the development of chloroplast, the shade habit and the quality formation of P. notoginseng.
Cloning, Molecular ; Computational Biology ; Geranylgeranyl-Diphosphate Geranylgeranyltransferase ; genetics ; Panax notoginseng ; genetics ; Real-Time Polymerase Chain Reaction