OBJECTIVE To investigate flora distribution and drug resistance status of hospital acquired infection with Gramnegative bacilli in lower respiratory tract in intensive care unit(ICU) and to provide the scientific reference for diagnosis and reasonable use of antibiotics.METHODS Referring to National Rules of Procedures in Clinical Laboratory,the strains were isolated.The strains were identified by Identification System of Microscan auto-4. The antibiotic susceptibility test was performed by K-B method and the results were read according to CLSI 2007.RESULTS Among 319 strains of Gram-negative bacilli,the top 4 of isolated rate were Pseudomonas aeruginosa(23.5%),Klebsiella pneumoniae(17.5%),Acinetobacter baumannii(14.4%),and Escherichia coli(14.1%).Severe drug resistance was found in four kinds of important pathogens.Except for 100% susceptibility of Enterobacteriaceae to carbopenems,the drug resistance rate to carbopenems in P.aeruginosa and A.baumannii reached 19.6%-22.7%.Pan-drug resistant strains were found in A.baumannii and P.aeruginosa strains.The detection rate of extensive-spectrum beta-lactamases(ESBLs)-producing K.pneumoniae and E.coli was 39.3% and 42.2%,respectively.CONCLUSIONS The Gram-negative bacilli isolated from lower respiratory tract in hospital acquired infection in ICU are mostly multi-resistant.We should strengthen monitoring and controlling of them.

Different types of cervical spondylosis treated by a vartiety of operative techniques were compared with the aim at improving quality of treatment for cervical spondylosis. 1780 operations including laminectomy, open door laminoplasty, subtotoal vertebrectomy, Cloward's technique, Smith's technique, "keyhole" decompression of the intervertebral foramina, discectomy with intervertebral fusion, intervertebral fixation with titanium cage, and fixation with titanium plate. The results showed:(1)Myelopathy in 363 cases: laminectomy on 4; subtotoal vertebrectomy on 136; Cloward's technique on 201; Smith's technique on 4; intervertebral fixed with titanium on 4; discectomy with fusion on 14. 104 cases were followed up, 82 7% of them showed good and excellent recovery. (2)Myeloradiculopathy in 1106 cases: laminectomy on 3; laminoplasty on 143; subtotoal vertebrectomy on 687; Cloward's technique on 263; Smith's technique on 2; discectomy with fusion on 8. 396 cases were fouowed up, 85 6% of them showed good and excellent recovery. (3)Radiculopathy in 35 cases: posterior approach key hole decompression of the intervertebral foramina on 19; lateral approach decompression of the intervertebral foramina on 9; anterior approach decompression of the intervertebral foramina on 7. Good and excellent results reached 100%. (4)Vertebral artery compression in 9 cases: resection of the osteophyte of the uncinate processes on 5; opening of the transverse foramen on 4. The results were good. (5)Esophagus compression in 18: after removing directly the osteophyte, the symptoms disappeared. (6)Ossification of the posterior longitudinal ligament in 93 cases: subtotal vertebrectomy on 39; laminoplasty on 45; laminectomy on 9. 41 cases were followed up, good and excellent recovery was seen in 85 3%. (7)Cervical stenosis in 156 cases: laminoplasty on 149 and laminectomy on 7. Good and excellent recovery was observed in 97 5%. All the results indicated that a variety of operative techniques could be selected depending on the site of the osteophytes. Direct resection of the lesion which produced compression and fixation or fusion of vertebral bodies were both important to achieve a satisfactory result

Objective To summarize overlapping tissue expansion of neck without platysma in repairing maxillofacial and neck scar contracture deformity.Methods Two expanders were buried in the same soft tissue pocket superficially to the platysma in an overlapping pattern,water injection were on schedule,and secondary operation was performed after 4 to 6 weeks.Results 16 cases of maxillofacial and neck scar contracture deformities were treated with overlapping tissue expansion of neck without platysma since 2004.Good results were achieved except one case of expander exposure,but the final resuit was good after suitable treatment.Conclusion The overlapping tissue expansion technique can provide much more expanded tissue and reduce complications compared with the traditional expansion technique,especially using overlapping tissue expansion of neck without platysma for repairing the defects at the maxillofacial and cervical region.

Objective To investigate the clinical value of face scar deformity by small-capacity tissue expansion. Methods A small-capacity expander of 10~100 ml was implanted into the hypoderm, and then regular affusion was made with injection pot outside or inside. After expanding for four weeks to eight weeks, the expander was removed and the removing wound surface of scar was repaired with flap. Results After clinical application in 32 cases, there were complications such as infection and expander's exposure occurred in two cases, but the final result was good after suitable treatment. All cases were satisfied with unclear scar after 6 to 36 months’ follow-up. Conclusions Positive cosmetic effect can be received with small-capacity tissue expansion.

Objective: To sum up our experience in percutaneous dilatational tracheostomy (PDT) in ICU patient with severe brain injury.
Methods: Between November 2011 and April 2014, PDTs were performed on 32 severe brain injury patients in ICU by a team of physicians and intensivists. The success rate, efficacy, safety, and complications including stomal infection and bleeding, paratracheal insertion, pneumothorax, pneumomediastinum, tracheal laceration, as well as clinically significant tracheal stenosis were carefully monitored and recorded respectively.
Results: The operations took 4-15 minutes (mean 9.1 minutes±4.2 minutes). Totally 4 cases suffered from complications in the operations: 3 cases of stomal bleeding, and 1 case of intratracheal bloody secretion, but none required intervention. Paratracheal insertion, pneumothorax, pneumomediastinum, tracheal laceration, or clinically significant tracheal stenosis were not found in PDT patients. There was no procedure-related death occurring during or after PDT.
Conclusion: Our study demonstrats that PDT is a safe, highly effective, and minimally invasive procedure. The appropriate sedation and airway management perioperatively help to reduce complication rates. PDT should be performed or supervised by a team of physicians with extensive experience in this procedure, and also an intensivist with experience in difficult airway management.

Hypoxia inducible factor-1αis a kind of hypoxia response factor. Acute cerebral ischemia and anoxia can induce up-regula-tion of hypoxia inducible factor-1α, and the downstream genes, which plays a role in both the energy metabolism and collateral circulation after cerebral ischemia. Neural stem and progenitor cells regeneration also benefit the functional outcome after ischemic stroke. Hypoxia in-ducible factor-1αmay induce proliferation and differentiation of neural stem and progenitor cells through Notch, Wnt/β-catenin pathways, etc., in the ischemic stroke model.

Objective To study the expression features of hydrolase genes related to the secretion of thyroid hormone of H22 hepatoma mice with different symptoms in early stage. Methods Firstly, The quantitative diagnosis and syndrome differentiation methods were used in H22 tumor-bearing mice in early stage, the expression profile of Tg and related hydrolase genes in poisonous pathogenic factors syndrome group (PPFS) and qi-deficiency syndromes (QDS) were got, and the major differential expression were selected. Secondly, the experiment was repeated and ELISA were used to detect T3 and T4 in serum, RT-PCR were applied to detect gene transcription level of genes including Tg, Ctsb, Ctsd, Ctsl, Napsa and Tpp1. Results ① Based on gene chip, the expression of Tg, Ctsb, Ctsd, Ctsl, Napsa and Tpp1were decreased in the first batch of experiment, the exactly ratio was Tg(0.77 in PPFS;0.84 in QDS), Ctsb(0.83 in PPFS, 0.91 in QDS), Ctsd(0.79 in PPFS;no notable change in QDS), Ctsl(no notable change in PPFS; 0.65 in QDS), Napsa(0.78 in PPFS; no notable change in QDS), and Tpp1 (0.75 in PPFS; no notable change in QDS), respectively. ② T3 and T4 downregulated in PPFS (the T3 value was 1.519±0.162ng/ml, T4 value was 2.194±0.305mg/dl) and in QDS (the T4 value is 4.366±0.727μg/dl) in early stage (P<0.01), especially in PPFS, which was in accordance with the change of Tg in both batches. ③the same trend happened in the validation of Tg(0.22 in PPFS;0.38 in QDS), Ctsb(0.31 in PPFS;0.55 in QDS), Ctsd(0.36 in PPFS;0.78 in QDS) and Napsa(0.24 in PPFS;0.59 in QDS) ,while ctsl(1.24 in PPFS;2.11 in QDS) and Tpp1 (2.85 in PPFS;0.85 in QDS)werethe opposite;even this, the total trend of the expression in QDS was still higher than that in PPFS. Conclusion All the results showed that the thyroid function of H22 hepatoma mice was inhibited in early stage especially in PPFS.

Objective:To explore whether peripheral blood CD8 +T lymphocyte dysfunction is correlated with the programmed death receptor-1 (PD-1) expression in patients with acute-on-chronic liver failure (HBV-ACLF). Methods:Peripheral blood mononuclear cells (PBMC) were collected from patients with HBV-ACLF and healthy controls. CD8 +T lymphocytes number and PD-1 expression condition in CD8 +T lymphocytes were detected by flow cytometry. CD8 +T lymphocytes isolated from peripheral blood of HBV-ACLF patients were further cultured in vitro. One group was added with PD-L1-IgG fusion protein (ACLF+PD-1 group), and the other group was added with IgG fusion protein (ACLF group). Proliferation ability (ki67), cell viability (CD69), and secretion ability of effector cytokines (IL-2, IFN-γ, TNF-α) were analyzed. Results:30 cases with HBV-ACLF and healthy controls were enrolled. CD8 +T lymphocytes absolute number was significantly lower in the peripheral blood of patients with ACLF group (333.88 ± 147.74)/μl than healthy controls (872.50 ± 206.64)/μl ( P < 0.001). PD-1 expression in peripheral blood CD8 +T lymphocytes were significantly increased in ACLF group (13.33% ± 2.52%), ( P = 0.027) than healthy controls (7.02% ± 2.12%). In in vitro culture, compared with healthy controls, the peripheral blood CD8 +T lymphocytes cell viability (CD69), proliferation ability (ki67) (all P ??< 0.001), and the level of cytokine production (IL-2, IFN-γ, TNF-α) (all P < 0.05) were equally weakened in patients with ACLF group. Compared with ACLF group, CD8 +T cell viability (CD69), proliferation ability (KI67) (all P < 0.05), and the level of cytokine production were weakened in ACLF+PD-1 group (all P < 0.05). Conclusion:HBV-ACLF patients have CD8 +T lymphocyte dysfunction. Therefore, PD-1 may have correlation in the regulation of CD8 +T lymphocyte dysfunction in ACLF patients.

Nannochloropsis has been considered as a promising feedstock for biodiesel production in recent years. To improve its lipid productivity, heavy-ion irradiation mutagenesis, an effectively breeding method used in plants and microorganisms was applied in Nannochloropsis oceanica OZ-1. After large-scale screening using Imaging-PAM and microplate-reader, two mutants (HP-1 and HP-2) with higher growth rate were isolated from the wild type N. oceanica. Subsequently analysis showed that after 18 days of cultivation biomass accumulation of the HP-1 and HP-2 mutant was increased by 18% and 26% respectively compare to the wild type. Total lipid productivity of the HP-1 and HP-2 mutant was 295 mg/(L x d) and 275 mg/(L x d), respectively, whereas that of the wild type was 247 mg/(L x d). Both mutants showed significantly advantage over their wild type concerning biomass accumulation and lipid productivity.
Heavy Ions ; Lipids ; biosynthesis ; Microalgae ; growth & development ; metabolism ; radiation effects ; Mutagenesis ; genetics ; Mutation ; genetics ; Stramenopiles ; genetics ; metabolism ; radiation effects

Objective: To investigates the prevalence of depression and anxiety among middle school students at different times, and to provide a reference for mental health promotion among adolescents. Methods: A total of 1 505 middle school students, selected from Chongqing in 2021 by using multi stage stratified random sampling method, were surveyed by using the Center for Epidemiologic Studies Depression Scale(CSE-D) and Zung Self Rating Anxiety Scale (SAS). Results: At the beginning of the semester, 434(27.6%) and 601 students( 38.2 %) reported depressive and anxiety symptoms,respectively. While at the end of the semester showed that 463 cases (30.8%) were prone to depression, and 653 cases ( 43.4 %) reported depressive and anxiety symptoms,respectively. The detection rate of depressive symptoms at the end of the semester was significantly higher than that at the beginning of semester. (43.4%, 38.2 %, χ 2=8.55, P <0.05). Depressive of female students at the end of the semester( 52.8 %) was higher than that at the beginning of the semester(46.3%)( χ 2=6.19, P <0.05) The detection rate of anxiety symptoms in senior high school students at the end of the semester(44.9%) was significantly higher than that of at the beginning of the semester(28.6%) ( χ 2= 43.33 , P <0.01). No significant difference in anxiety symptoms boys and junior high school students between the beginning and the end of the semester ( χ 2=2.34, 0.71, P >0.05). Conclusion Substantial changes are observed in anxiety symptoms among female middle school students and depressive and anxiety symptoms among high school students in different periods of a semester. When investigating depression and anxiety of middle school students, time effect should be considered.