Objective To explore the bacterial flora distribution characteristics and drug resistance of pus bacterial culture in a‐cute mastitis and to analyze thechange trend of drug resistance spectrum to provide a evidence‐based basis for the rational use of an‐timicrobial agents in clinic .Methods The pus collected from 207 cases of acute mastitis was conducted the bacterial culture .The bacterial identification and antibacterial susceptibility test were performed by adopting the manual experiment combined with the DL‐96 system .Partial drug susceptibility test was performed by combining with the K‐B method .Results Among 207 specimens , 82 strains of pathogenic bacteria were detected with the detection rate of 39 .6% ,including 51 strains (62 .2% ) of staphylococcus aureus ,7 strains (8 .5% ) of pseudomonas aeruginosa ,4 strains (4 .9% ) of staphylococcus intermedius ,4 strains (4 .9% ) of staphy‐lococcus epidermis ,3 strains (3 .7% ) of acid‐producing klebsiella bacteria and each 1 strain of staphylococcus hemolyticus and other 13 kinds of bacterium .The resistance rates of staphylococcus aureus to azithromycin ,erythromycin and clarithromycin were 92 .2% ,84 .3% and 84 .3% respectively ,indicating that macrolides drugs had a higher overall drug resistance rate and were not suitable for selection and use;the resistance rates of moxifloxacin and ciprofloxacin were 3 .9% and 4 .1% respectively ,the MRSA detection rate was 27 .5% .The resistance rates of Pseudomonas aeruginosa to ticarcillin/clavulanic acid was 85 .7% ;the drug resitance rate of cefoperazone was 83 .3% ;which of gentamycin and amikacin was 71 .4% ;which of aztreonam was 14 .3% ;which of ceftazidime was 28 .6% and which of meropenem was 28 .6% .Conclusion The majority of detected bacteria in pus from the pa‐tients with acute mastitis are Staphylococcus aureus ,followed by pseudomonas aeruginosa ,which is different from that reported by other literatures ,showing the bacterial distribution has regional difference .Staphylococcus aureus has high resistance rate to macrol‐ides antibacterial drugs ,but is highly sensitive to ciprofloxacin and moxifloxacin;Pseudomonas aeruginosa has higher resistant rate to ticarcillin/clavulanic and cefoperazone ,but it is highly sensitive to aztreonam ,ceftazidime and meropenem .Empirical medication should be comprehensively considered by combining with drug resistance spectrum of Staphylococcus aureus and Pseudomonas aeruginosa ,and the sensitive drugs should be selected according to the drug susceptibility results after the antimicrobial susceptibili‐ty test for conducting the targeted medication .

OBJECTIVETo investigate the effect of insulin-like growth factor-I (IGF-I) on the proliferation and osteogenesis of human periodontal ligament stem cells (hPDLC) under three-dimensional (3D) culture system.

METHODSHuman periodontal cells were isolated from the ligament of surgically extracted human teeth, and through the limiting dilution assay, got mono-clone of the cell, hPDLCs were isolated from MesenPRO RS medium. Rotary cell culture system (RCCS) was enrolled to set 3D environment. Control group and experiment groups were assigned according to the concentration of IGF-I. There were 5 level of experiment groups (0.1, 1, 10, 50, 100 µg/L). Proliferation was tested with methyl thiazolyl tetrazolium (MTT), and alkine phosphatase (ALP) level was assayed by spectrophotometer to analyze the osteogenesis of hPDLCs. Gene expression of ostetocalcin (OCN) and type I collagen (Col I) were assayed by reverse transcriptase polymerase chain reaction (RT-PCR).

RESULTSIn 3D culture system, the effect of IGF-I on cell proliferation was significantly different between control group and experiment groups (P < 0.05), and there showed significant differences between the group of 0.1 µg/L (0.219 ± 0.021) IGF-I and the groups of 50, 100 µg/L (0.287 ± 0.011, 0.293 ± 0.012). However, there showed no significant differences among other groups. Significant differences of ALP activity were observed between the control group and experiment groups, and between the groups of 1, 10 µg/L (0.304 ± 0.020, 0.310 ± 0.013) and that of 50, 100 µg/L (0.347 ± 0.011, 0.344 ± 0.010) (P < 0.05). While no significant differences were detected between the group of 1 µg/L and that of 10 µg/L, nor between the group of 50 µg/L and that of 100 µg/L. Expressions of Col I and OCN in mRNA and protein level both showed dose-dependent increase.

CONCLUSIONSIn 3D culture system, in the scale of 0.1 - 100 µg/L, the effect of IGF-I on the proliferation of hPDLCs increased dose-dependently. 100 µg/L IGF-I promotes osteogenesis of the cells significantly.

Alkaline Phosphatase ; metabolism ; Cell Culture Techniques ; Cell Proliferation ; drug effects ; Cells, Cultured ; Collagen Type I ; genetics ; metabolism ; Dose-Response Relationship, Drug ; Humans ; Insulin-Like Growth Factor I ; pharmacology ; Osteocalcin ; genetics ; metabolism ; Osteogenesis ; drug effects ; Periodontal Ligament ; cytology ; RNA, Messenger ; metabolism ; Stem Cells ; cytology ; metabolism

OBJECTIVETo explore the effect of basic fibroblast growth factor 1 (bFGF1) during embryonic development on hematopoiesis, to study the expression of FGF1, vascular endothelial growth factor receptor (KDR), CD133, CD34 and transcription factors Ihh, SCL, GATA-1, GATA-2 and PU. 1 in the yolk sac, and to learn about the role and relationships of FGF1, hematopoietic cells and transcription factors during embryonic hematopoiesis.

METHODS10 microm sections and total RNA were prepared from 107 human embryos aged 3-12 weeks. Immunohischemical SP staining and RT-PCR were performed.

RESULTSThe yolk sac blood islands of human 3 approximately 12 weeks embryos consisted of peripheral vascular endothelial cells and central hematopoietic cells. The expression of FGF1 was firstly found in visceral mesoderm around periphery of yolk sac blood island at day 16, while was little inside it. KDR was not or lowly expressed and CD34 and CD133 were not expressed then. The expression increased, gray value decreased and staining enhanced at day 21. Strong staining of CD34+, CD133+ and KDR+ cells were found in blood island and mesoderm at day 30, their gray values changed from 156 +/- 16, 173 +/- 18 and 160 +/- 14 to 53 +/- 7, 52 +/- 6 and 69 +/- 8 respectively. FGF1 expression was strong positive, the gray value declined dramatically from 161 +/- 13 to 40 +/- 5. Some positive cells formed vessel-like structure along the periphery of blood island. Moderate expression of CD34+, CD133+, KDR+ cells increased at day 45, the cells aggregated into mass in blood island and FGF1+ cells did the same in blood island, while little in mesoderm. Its gray valve was increased. After 7 weeks, CD133+, KDR+, CD34+ cells significantly decreased their gray values increased, the staining became week. FGF1 was weakly expressed in yolk sac and its gray value increased to 179 +/- 22. RT-PCR showed Ihh, SCL, GATA-1 and GATA-2 were expressed at different time in yolk sac. PU. 1 were not expressed at day 16, and then expressed.

CONCLUSIONSThe hematopoietic properties of yolk sac may be dependent on signaling through FGF receptors and FGF1 plays an important role in hematopoietic stem cell homeostasis. The FGF pathway regulates primitive hematopoiesis by modulating transcription factors such as Gata1 expression level and activity.

Embryo, Mammalian ; metabolism ; physiology ; Fibroblast Growth Factor 1 ; metabolism ; Hematopoiesis ; Humans ; In Vitro Techniques ; Yolk Sac ; metabolism ; physiology

OBJECTIVETo investigate the effect of insulin-like growth factor- I (IGF- I) on the proliferation and alkaline phosphatase (ALP) activity of human periodontal ligament cells (hPDLCs) under three-dimensional (3D) culture system.

METHODSThe hPDLCs were cultured from periodontium of human teeth by the outgrowth method. Rotary cell culture system (RCCS) was enrolled to set 3D culture system. Samples were set to four groups: Negative control group, positive control group (3D group, IGF-I group), and experimental group (3D with IGF- I group). Proliferation was tested with methylthiazolyl tetrazolium (MTT), and ALP activity was assayed by spectrophotometer at 1, 3, 5, 7 d respectively.

RESULTSCompared with that of negative control group, cell proliferation increased significantly in 3D with IGF-I group since 3 d (P < 0.05). Besides, the cell proliferation of 3D with IGF-I group was significantly higher than that of 3D group (P < 0.05). ALP activity of 3D with IGF- I group was significantly higher than that of negative control group, and 3D group at 3, 5, 7 d (P < 0.05).

CONCLUSIONIGF-I significantly promotes the proliferation and ALP activity of hPDLCs under 3D culture system.

Alkaline Phosphatase ; Cell Differentiation ; Cell Proliferation ; Cells, Cultured ; Humans ; Insulin-Like Growth Factor I ; Periodontal Ligament ; Somatomedins

OBJECTIVETo investigate the effects of electromagnetic radiation on the physiological indices and immune function of operators.

METHODSThe general conditions and electromagnetic radiation awareness rate of 205 operators under electromagnetic radiation were evaluated using a self-designed questionnaire. Physical examination, electrocardiography, and routine urine test were performed in these operators. Peripheral blood was collected from the operators under electromagnetic radiation for blood cell counting and biochemical testing, and their peripheral blood lymphocytes were cultured for determination of chromosomal aberrant frequency and micronucleus frequency. The data from these operators (exposure group) were compared with those of 95 ordinary individuals (control group).

RESULTSThe chief complaint of giddiness, tiredness, dizziness, and amnesia showed significant differences between the exposure group and control group (P < 0.01), and the difference in headache became larger with an increase in working years. The awareness rate of electromagnetic radiation damage was significantly higher in the exposure group than in the control group. The difference in bradycardia was significant between the two groups (P <0.01), and the incidence was higher with longer working years. Significant differences between the two groups were also found in the numbers of individuals with elevated alanine aminotransferase, total bilirubin, and direct bilirubin (P < 0.01), populations with increased lymphocyte ratio and decreased neutrophil ratio (P < 0.01), populations with positive occult blood, urobilinogen, and bilirubin tests, and the number of individuals with increased micronucleus frequency of cultured peripheral blood lymphocytes (P < 0.01). In addition, the exposure group had significantly increased complement C3 and C4 (P < 0.01), significantly increased IgG (P < 0.05), and significantly decreased IgM (P < 0.01), as compared with the control group.

CONCLUSIONElectromagnetic radiation may lead to the changes in physiological indices, genetic effects, and immune function and affect the health and immune function in operators. The adverse effects are increased as the working years increase. So it is important to strengthen occupational protection of operators under electromagnetic radiation.

Adult ; Chromosome Aberrations ; radiation effects ; Electromagnetic Radiation ; Female ; Humans ; Lymphocytes ; radiation effects ; Male ; Middle Aged ; Occupational Exposure ; adverse effects ; Young Adult

Heart failure (HF) is the end stage of various kinds of cardiovascular diseases and leads to a high mortality worldwide.Numerous studies have demonstrated that frequencies of CD4+CD25+Foxp3+ regulatory T cells (Tregs) are reduced in HF patients and properly expanding Tregs attenuates HF progression.Histone deacetylase (HDAC) 9 has been revealed to contribute to several cardiovascular and cerebrovascular diseases.Plenty of studies showed that HDAC9 negatively regulated the number and function of Tregs.Thus,we aim to investigate the expression of HDAC 9 in patients with chronic heart failure (CHF) and the relationship among HDAC9,Tregs and CHF.Our research showed a reduced number of Tregs and an increased expression of HDAC9 mRNA in CHF patients.Patients with CHF were divided into two groups by heart function grade of New York Heart Association (NYHA),we found that the HDAC9 mRNA expression level in NYHA grade Ⅱ-Ⅲ group were lower than that in NYHA grade Ⅳ group.More importantly,the correlation study suggested that the expression of HDAC9 mRNA was negatively correlated to Tregs frequency and left ventricular ejection fraction (LVEF),whereas positively correlated to larger left ventricular end-diastolic dimension (LVEDD) and B-type natriuretic peptide (BNP) in patients with CHF.The correlation studies also showed a positive correlation between HDAC9 and the severity of CHF.Our research suggests that HDAC9 may be a new indicator for assessing CHF and it may offer a new direction for research of CHF.

To gain more insights into epidemiologic characteristics and genotype of hantavirus in Apodemus agrarius in Changbai Area. Complete hantavirus S segment sequences were amplified by RT-PCR and sequenced. The phylogenetic trees were constructed for analysis of genetic characters of hantavirus. A total of 58 Apodemus agrarius were trapped in the epidemic areas, and complete hantavirus S segment sequences were obtained from 4 lung samples of these rodents (6. 90%0). Phylogenetic analysis of the four S segment sequences indicated that all viruses isolated from Apodemu sagrarius were closely related to genotype 6 of Hantaan virus (95. 8%-96. 3%, nucleotide identity; 98. 6%-99. 5%, amino acid identity), all of them had a specific S387 different from other genotypes of Hantaan virus.
Animals ; Base Sequence ; China ; epidemiology ; DNA, Complementary ; chemistry ; genetics ; Disease Reservoirs ; virology ; Genotype ; Hantavirus ; classification ; genetics ; isolation & purification ; Hantavirus Infections ; epidemiology ; veterinary ; virology ; Lung ; virology ; Murinae ; virology ; Phylogeny ; RNA, Viral ; genetics ; Reverse Transcriptase Polymerase Chain Reaction ; Rodent Diseases ; virology ; Sequence Analysis, DNA ; Viral Proteins ; genetics

OBJECTIVETo collect background information on drug-resistant HIV-1 strains in various regions before the start of nation-wide antiretroviral therapy in China.

METHODSTwenty percent of the 2,000 blood samples from antiretroviral therapy naive patients collected for the 2nd national HIV molecular epidemiology survey (NHMES) in 2002 were randomly sampled for this study. The entire protease gene and 20-230 amino acids of the reverse transcriptase gene were amplified by PCR from provirus DNA and sequenced. The results were analyzed with HIV db-Drug Resistance Algorithm and genotypic resistance mutations were determined to particular anti-HIV drugs.

RESULTSTotally 164 protease gene sequences and 138 reverse transcriptase gene sequences were obtained from patients; 0.61% of 164 sequences displayed primary resistance mutations in the protease gene, whereas 99.39% carried 1 or more secondary mutations. Genotypic resistance to at least one nucleoside reverse transcriptase inhibitors (NRTI) was present in 5.80%,and resistance to at least one non-nucleo side reverse transcriptase inhibitors (NNRTI) was present in 1.45% of samples.

CONCLUSIONThe prevalence of genotypic drug resistance is very low in drug-naive HIV infected patients from 21 provinces of China tested in this study. Laboratories participated in the NHMES have organized a network to provide drug resistance monitoring service in the current nation-wide antiviral treatment program in China.

Anti-HIV Agents ; therapeutic use ; China ; epidemiology ; Drug Resistance, Viral ; Genotype ; HIV Infections ; drug therapy ; epidemiology ; virology ; HIV Protease ; genetics ; HIV Protease Inhibitors ; therapeutic use ; HIV Reverse Transcriptase ; genetics ; HIV-1 ; genetics ; Humans ; Mutation ; Reverse Transcriptase Inhibitors ; therapeutic use ; Sentinel Surveillance

Amino Acid Sequence ; Blood Donors ; Gene Deletion ; Gene Products, nef ; chemistry ; genetics ; Humans ; Molecular Sequence Data ; nef Gene Products, Human Immunodeficiency Virus

Objective To understand the species composition, density and seasonal variation of adult mosquitoes in Tongliao City of Inner Mongolia Autonmous Region from 2017 to 2019, and to provide scientific data for risk assessment and prediction of mosquito-borne diseases, mosquito-borne control planning, precise implementation and effect evaluation. Methods The density of adult mosquitoes was monitored in parks, hospitals, residential areas, farmers and cattle sheds in Tongliao by using the light trap method. Results A total of 3 358 adult mosquitoes were captured, including Anopheles sinensis, Culex tritaeniorhynchus and Culex quinquefasciatus with Culex quinquefasciatus as the dominant species.The change curve of adult mosquito density with season showed a single peak, and the peak period was from July to September.The density of adult mosquito in cattle shed was the highest (6.71 per night), and that in hospital was the lowest (0.99 per night).The difference between urban and rural areas in seasonal distribution of adult mosquitoes was statistically significant (χ²=4.65, P < 0.05). Conclusion Culex pipiensquinquefasciatus is the dominant mosquito species in the local area, and the villages are the places with high incidence of mosquito infestation.