Objective To investigate the biofilm formation,the alginate biosynthetic gene ex- pression and analyze the mucA gene sequence of mucoid Pseudomonas aeruginosa PA17 and nonmu- cold Pseudomonas aeruginosa PA01.Methods The modified plate culture method was used to estab lish the biofilm model in vitro.Semi-quantitative RT-PCR was used to determine the expression level of algD in planktonic condition and during the formation of biofilm.The mucA gene of PA17 and PA01 was amplified and the products were sequenced.Results PA17 biofilm was mature at 6th day, and PA01 biofilm was mature at 3rd day.The structures of the biofilms were both like pellicle.In planktonic condition,the algD expression of PAl7 was higher than PA01;in biofilm formation,the algD expression was maximal when the biofilm was mature.There was a 166～333 deletion mutation and 342A→G in mueA gene of PA17,the mucA gene of PA01 was the same with the sequence of Genbank.Conclusions The mucA gene mutation of PA17 was a new type,which maybe the reason for the little expression difference of algD between PA17 and PA01 during the biofilm formation than it in planctonic condition and the same structure of PA17 and PA01 biofilm.

Antitubercular Agents ; therapeutic use ; Child ; Child, Preschool ; Diagnostic Errors ; Female ; Fever ; etiology ; Humans ; Infant ; Male ; Pediatrics ; Tuberculosis ; drug therapy ; microbiology ; physiopathology ; X-Ray Film

Asthma ; immunology ; virology ; Bronchiolitis, Viral ; complications ; immunology ; virology ; Child ; Humans ; Respiratory Syncytial Virus Infections ; complications ; genetics ; immunology ; Risk Factors ; Severity of Illness Index

BacKground:RectaI carcinoid is a rareIy seen neuroendocrine tumor. TiII now,there is controversiaI for the treatment modaIities of rectaI carcinoids with diameter between 1-2 cm. Aims:To study the expression of Ki-67 in rectaI carcinoids and the efficacy and safety of endoscopic resection. Methods:A totaI of 83 rectaI carcinoid patients with tumor diameter Iess than 1. 5 cm were enroIIed. AII patients were pathoIogicaIIy diagnosed and underwent endoscopic mucosaI resection from Jan. 2008 to Dec. 2013 at Chongqing Three Gorges CentraI HospitaI and Wuhan Tongji HospitaI. The medicaI records were retrospectiveIy reviewed and expression of Ki-67 in tumor tissue was assessed by immunohistochemistry. Results:AII patients underwent preoperative endoscopic uItrasonography. Tumors were Iimited to mucosa or submucosa, and no muscuIaris propria invoIvement or metastasis was seen. The mean foIIow-up duration was 38 months,and no recurrence or metastasis occurred. Ki-67 was IowIy expressed in aII rectaI carcinoids(0. 84% ± 0. 67%). When tumors were grouped by size,no significant differences in gender,age,tumor site and Ki-67 expression IeveI were seen between <1. 0 cm group and 1. 0-1. 5 cm group(P >0. 05). Furthermore,when tumors were grouped by a cutoff vaIue of mean Ki-67 index 0. 84%,differences in cIinicopathoIogicaI parameters between the two groups were not significant either( P >0. 05 ). Conclusions:Ki-67 is IowIy expressed in rectaI carcinoids Iess than 1. 5 cm in diameter enroIIed in this study,which denoted an inactive proIiferation. For rectaI carcinoids with diameter Iess than 1. 5 cm,with Iow Ki-67 expression and without muscuIaris propria invoIvement and metastasis, IocaI endoscopic excision is an effective and safe treatment modaIity.

Abstract： Objective　To investigate the distribution and antimicrobial resistance profile of the bacterial strains isolated from blood cultures in neonatal septicemia children of Neonatology Department, the First People's Hospital of Chuzhou during Jan. 2017-Dec. 2021, in order to guide clinical rational drug use. Methods　The distribution and the results of antimicrobial susceptibility tests and characteristics of the pathogenic bacteria isolated from blood culture samples in neonatal septicemia children in the First Hospital of Chuzhou from Jan. 2017 to Dec. 2021 were retrospectively analyzed. The results were analyzed with WHONET 5.6 software, according to the Clinical and Laboratory Standards Institute (CLSI) 2021 breakpoints. 　Results　A total of 189 strains were isolated from the 4 538 sample of blood cultures, the positive rate was 4.2%, including 59(31.2%) Gram-negative bacterial strains, 130 (68.8%) Gram-positive bacterial strains. The most frequently isolates were coagulase-negative staphylococci（64.0%), Serratia liquefaciens (15.9%), Escherichia coli (3.2%), Acinetobacter lwoffii (2.6%) and Delftia acidovorans (2.6%). The prevalence of methicillin-resistant isolates was 81.8%(99/121) in coagulase-negative Staphylococci and 25.0%（1/4） in Staphylococcus aureus. No staphylococcal strains were found resistant to vancomycin, quinupristin-dalfopristin or linezolid. The sensitivity of the antibacterial drug monitored by Serratia liquefaciens was 100.0%.Conclusions　Gram-positive bacterial are the main pathogen of neonatal septicemia, and is highly resistant to the common antibacterial drugs. The clinical should choose antibacterial agents reasonably according to drug sensitivity.

Objective To evaluate the effect of sedation with midazolam combined with propofol on delirium in mechanically ventilated patients in the intensive care unit (ICU).Methods Five hundred and twenty-two patients who required sedation and analgesia,endotracheal intubation and mechanical ventilation used to assist respiration,aged 28-64 yr,weighing 41-82 kg,were randomized into 2 groups according to the sedation protocols during therapy:sedation with midazolam group (group M,n =240) and sedation with midazolam + propofol group (group MP,n=232).In M and MP groups,sedation was induced with midazolam infusion 0.03-0.17 mg/min,and analgesia was induced with sufentanil infusion 0.07-0.14 μg/min.In group MP,when hemodynamics was stable,pressure support was 8-10 cmH2O,tidal volume＞400 ml,RR ＜25 bpm,and FiO2＜45％,sedation was induced with propofol infusion 0.8-2.0 mg/min instead,lasting for 12-24 h.Richmond Agitation Sedation Scale score was maintained at-1 to-2 during vcntilation.The development and duration of delirium were recorded.Delirium was divided into hyperactive delirium,hypoactive delirium and mixed delirium 3 subtypes,and the development and duration of the 3 subtypes of delirium were also recorded.Results There was no significant difference between the two groups in the incidence and duration of delirium.Compared to group M,the incidence of hyperactive delirium was significantly decreased,and no significant change was found in the incidence of hypoactive delirium and mixed delirium and the duration of the 3 subtypes of delirium in group MP.Conclusion Sedation with midazolam and propofol can decrease the development of hyperactive delirium,but can not shorten the duration of delirium in mechanically ventilated patients in the ICU.

Objective To explore the changes and the tendency of breast cancer radiotherapy in China within the past decade.Methods A survey on breast cancer radiotherapy in 1 999 and 2006 was conducted in 4 hospitals located within the southeast coastal region of China,including patients'clinical characteristics,the purpose of radiotherapy and its techniques.Results The percentage of breast conservative treatment(BCT)increased from 3%in 1999 to 13%in 2006.For radiotherapy techniques in 2006 compared with 1999,the growth trend was found in use of breast immobilization devices(80% vs.46%),treatment planning system(70% vs.23%),and CT simulation(14%vs.0).The frequency was increased in the chest wall irradiation after masteetomy(90%vs.67%),but decreased in internal mammary region(30%vs.76%)and axilla(37%vs.69%)treatment.There were no differences in total dose and fractionation prescription.Conclusions BCT was performed more frequently,but postmastectomy radiotherapy was still essential option in China at present.Although some advanced techniques were applied frequently in clinical practice.Simulation,treatment planning,and irradiation target design were urgent for improvement and standardization.

OBJECTIVETo investigate the core functional region of antimicrobial peptide LL-37, which inhibites RSV replication and could be developed for theraputic aplication.

METHODSA panel of 6 partial LL-37 peptides (referred to as P1 to P6) was synthesized according to LL-37 amino acide sequence. Hep-2 cells were infected with RSV, treated with LL-37 or partial peptides respectively. Cells were collected after 24 hours incubation at 37 degrees C, CO2 5%. Total RNA was obtained from the cells. Expression level of RSV N gene was quantified by real-time PCR. Meanwhile enzyme-linked immunosorbent assay (ELISA) was used to quantify the chemokines RANTES, IL-8, MCP1 in the supernatants of Hep-2 cultures after 24 h incubation with or without LL-37 and partial peptide P6.

RESULTSN-terminal partial LL-37 peptide (corresponding to residues 1-12 of LL-37) had no significant effects on RSV replication (P > 0.05). In contrast, C-terminal (corresponding to residues 13-37) and a panel of 4 overlapping 22-mer partial peptides (from the peptide incorporating aa 13-34 through that spanning aa 16-37) showed significant inhibitory effect on RSV replication to some extent (P < 0.05 or P < 0.01). LL-37 induced significant expression of chemokine RANTES, IL-8 and MCP-1 in Hep-2 cells. In contrast, partial peptide P6 had no significant effect on expression of the chemokines in Hep-2 cells.

CONCLUSIONThe LL-37 C-terminal 22-mer partial peptide P6 was putative core functional region for inhibition of RSV replication. The partial peptide didn't induce significant expression of chemokine RANTES, IL-8 and MCP-1.

Cathelicidins ; pharmacology ; Cell Line ; Cytokines ; genetics ; immunology ; Humans ; Respiratory Syncytial Virus Infections ; genetics ; immunology ; virology ; Respiratory Syncytial Viruses ; drug effects ; physiology ; Virus Replication ; drug effects

Objective To detect the mutations of ATP2C1 gene in patients with Hailey-Hailey dis- ease (HHD).Methods PCR and direct sequencing were performed in 17 patients and 120 healthy controls to screen the mutations in the exons of ATP2C1 gene.Results Eight mutations were identified in nine probands, including three deletion mutations (nt1464-1487 del/nt1462-1485del,1523delAT,2375delTTGT),three splice site mutations (360—2A→G,1415—2A→T,2243+2T→C) and two missence mutations (C920T and G1942T).None of the above mutations was found in the controls.Conclusion Eight specific novel mutations were identified in nine probands of HHD,which could be causative factors of the disease.

OBJECTIVETo establish a rat model of low calcium diet related hyperoxaluria and explore its features.

METHODSBy means of randomized blocks design, totally 24 SD male rats were divided into low calcium diet group, medium calcium diet group, and high calcium diet group. Each group was sequentially fed on different calcium diets for 3 days. The urinary volume within 24 hours was recorded, the consistency of urinary oxalate by high-efficiency liquid chromatography, and the consistency of urine creatinine by automatic biochemical analyzer. The consistency was corrected to the output of urinary oxalate of rats in 24 hours, and the results were evaluated by repeated measurement of variance analysis and multivariate analysis of variance.

RESULTSThe output of urinary oxalate of rats in 24 hours varied with time (F=7.893, P0.05). The output of urinary oxalate of rats in 24 hours varied with group division (F=3.565, P<0.05). The output of urinary oxalate in 24 hours in three groups on the third day was significantly higher than that on the first day (P<0.05).

CONCLUSIONBy controlling the calcium intake, we successfully established the model of low calcium diet related hyperoxaluria in rat.

Animals ; Calcium Carbonate ; administration & dosage ; Diet ; Disease Models, Animal ; Hyperoxaluria ; etiology ; urine ; Male ; Rats ; Rats, Sprague-Dawley