Objective To investigate the risk factors in the outcome of neonatal pulmonary hemorrhage. Methods A total of 69 cases of neonatal pulmonary hemorrhage from January 2005 to December 2011 were studied. They were divided into 2 groups according to clinical outcome (death or alive). The data of the two groups were compared using single factor analysis. The risk factors were analyzed using multi-factor analysis. Results The death of neonates with pulmonary hemorrhage was correlated with aspiration pneumonia, coagulation abnormalities, DIC, heart failure and MPV. Multi-factor analysis showed that DIC (OR=6.90, 95%CI:1.514-31.419), heart failure (OR=9.62, 95%CI:1.710-54.150) and MPV<11 prior to pulmonary hemorrhage (OR=7.01, 95%CI:1.475-33.312) were the independent risk factors of neonatal pulmonary hemorrhage. Conclusions For the neonatal pulmonary hemorrhage with DIC, heart failure and low MPV, active intervention should be implemented.

Objective: To study the chemical constituents of the stem bark of Albizia julibrissin Durazz. Methods: Chemical constituents were isolated by the repeated chromatography methods and their structures were identified by spectral analysis. Results: Five compounds were obtained as follows: 3 O [? D xylopyranosyl (1→2) ? D fucopyranosyl (1→6) ? D glucopyranosyl] 21 O (6S) 2 trans 2 hydroxy methyl 6 methyl 6 O ? D quinovopyranosyl 2,7 octadienoyl acacic acid 28 O ? D glucopyran osyl (1→3) [? L arabinofuranosyl (1→4)] ? L rhamnopyranosyl (1→2) ] ? D glucopyranosyl ester (1). acacigenin B (2), julibrotriterpenoidal lactone A (3), machaerinic acid lactone (4), acacic acid methylester (5). Conclusion: Compound 1 was isolated directly from this plant for the first time.

This study examined the effect of IKVAV peptide nanofiber on proliferation, adhesion and differentiation into neurocytes of bone marrow stromal cells (BMSCs). IKVAV Peptide-amphiphile was synthesized and purified. Then, hydrogen chloride was added to the diluted aqueous solutions of PA to induce spontaneous formation of nanofiber in vitro. The resultant samples was observed under transmission electron microscope. BMSCs were cultured with IKVAV peptide nanofiber. The effect of IKVAV nanofiber on the proliferation, adhesion and induction differentiation of BMSCs was observed by inverted microscopy, calcein-AM/PI staining, cell counting and immunofluorescence staining. The results demonstrated that IKVAV peptide-amphiphile could self-assemble to form nanofiber gel. BMSCs cultured in combination with IKVAV peptide nanofiber gel grew well and the percentage of live cells was over 90%. IKVAV peptide nanofiber gel exerted no influence on the proliferation of BMSCs and could promote the adhesion of BMSCs and raise the ratio of neurons when BMSCs were induced to differentiate into neurocytes. It is concluded that BMSCs could proliferate and adhere well and yield more neurons during when induced to differente into neurocytes on IKVAV peptide nanofiber gel.

Objective To evaluate the effect of dexmedetomidine on lung injury induced by extremity ischemia-reperfusion.Methods Forty patients,aged 18-60 yr,with body mass index of 20-25 kg/m2,of ASA physical status Ⅰ or Ⅱ,with 1 h ≤ predicted duration of surgery ≤ 1.5 h,were randomly divided into 2 groups (n =20 each) using a random number table:control group (group C) and dexmedetomidine group (group D).In groupD,dexmedetomidine 1 (g/kg was infused intravenously for 10 min,followed by continuous infusion of dexmedetomidine at 0.5 μg· kg-1 · h-1 until the end of the surgery,while in group C the equal volume of normal saline was given instead.Immediately before induction of anesthesia (T1,baseline),at 60 min after tourniquet was inflated (T2) and at 30 min,2 h and 6 h after tourniquet release (T3-5),blood samples were collected from the radial artery for blood gas analysis and for measurement of the levels of plasma interleukin-6 (IL-6),IL-8,tumor necrosis factor-α (TNF-α),malondialdehyde (MDA) and superoxide dismutase (SOD),and arterial partial pressure of oxygen (PaO2) and partial pressure of carbon dioxide (PaCO2) were recorded.Alveolar-arterial oxygen difference (A-aDO2) and respiratory index (RI) were calculated.Results Compared with group C,PaO2 was significantly increased at T5,and A-aDO2 and RI at T5,the levels of plasma IL-6 and IL-8 were decreased at T4,5 and the levels of plasma TNF-α,MDA and SOD were decreased at T3-5 in group D.Conclusion Dexmedetomidine can attenuate lung injury induced by extremity ischemia/reperfusion via inhibiting inflammatory responses and lipid peroxidation.

Objective To investigate risk factors bringing on death and the conversion factors of renal function in the elder acute re-nal failure (ABF) and establish the prevention and treatment measure in clinic to reduce mortality. Methods The clinical information of 143 elder ARF cases which were treated by two hospitals for many years was studied. The risk factors possible bringing on death in the elder ARF were studied by using binary logistic regression pattern. The clinical factors possible affecting the conversion of renal function in the eld-er ARF were analyzed. Results Binary logistic regression pattern study showed that heart failure, respiratory failure, gastrointestinal bleed-ing, hepatic failure, coma, organ failure number and lower blood pressure among 25 study factors were found to be the risk factors bringing on death, and heart failure, respiratory failure, organ failure number and whether chronic renal insufficiency were the most important factors of affecting recover of renal function in the elder ARF. Conclusion The effective prevention and treatment measure should be adopted in the elder ARF with these risk factors so as to reduce mortality and increase the recover rate of renal function.

The solvent sublation technique was applied for the separation and enrichment of L-Arg using dodecylbenzene sulfonic (DBSA) as the surfactant, di (2-ethylhexyl) phosphoric acid (P204) as the extractant and n-heptane as the organic solution. The solvent sublation was compared with the floatation complexation extraction, foam floatation and solvent extraction. The experimental results showed that enrichment ratio of 16.2 and removal rate of 97.2% to L-Arg were obtained by the solvent sublation under the conditions of room temperature, 0.09 g/L L-Arg aqueous solution 250 mL, DBSA concentration 0.15 g/L, the initial pH 7.0, volume of n-heptane 10 mL, volume of P204 4.5 mL, gas flow rate of 200 mL/min. The study of the kinetics indicated that the solvent sublation process could be divided into three stages distinctly. The processes of the first stage and the second stage followed the first order kinetics equation; the process of the third stage followed the zero order kinetics equation. The separation mechanism of solvent sublation was also discussed.

Background The diagnosis of central serous chorioretinopathy (CSC) is mainly dependent onfluorescine fundus angiography (FFA). However, the combination of optical coherence topography (OCT) with FFA offers a new approach to the research of the pathogenesis of CSC. Objective This clinical study was designed to study the combined application of the FFA and OCT for the research of the pathogenesis of central serous chorioretinopathy (CSC). Methods Forty-four eyes of 44 patients with CSC were included in this study with 36 cases of males and 8 cases of female. The patients were aged 39.3 ± 5.3 years and the visual acuity was 0. 64 ±0. 27. FFA and OCT examinations were performed in all patients and the FFA images were imported into the Topcon 3D OCT 1000 device to locate the conformity of OCT lesions with the leakages of FFA. The neuroepithelial layer thickness at the fovea and the height of the neuroepithelial layer detachment were measured using 3-D OCT. Results OCT showed serous REP detachment in 34 eyes (77.3%) and rough surfaces of RPE in 10 eyes (22. 7% ). In thirtyfour eyes with RPE detachment, the OCT lesions and FFA leakage spots conformed to the same locations in 31 eyes, but the other three eyes did not. The mean foveal neuroepithelial thickness was (138.5±19.4) μm in CSC eyes and that of normal eyes was ( 131.35±5. 01 ) μm ,showing a significant difference between them( t=0. 39 ,P＞0. 05 ). The mean height of neuroepithelial detachment was (263.3 ± 126.7 ) μm in CSC eyes. Conclusion RPE detachment occurs in CSC eyes and further induces macular neuroepithelial detachment. Leakage lesion of fluorescine corresponds to RPE detachment. CSC without RPE detachment may be related to the increase in RPE permeability. OCT can accurately measure the thickness of the macular neuroepithelial layer and the height of the neuroepithelial detachment.

Lack of biocompatibility and bioactivity is a big problem for the synthetic materials that have been generated for neural tissue engineering. To get around the problem and generate better scaffold for neural tissue repair, we intended to generate nano-fibers by self-assembly of polypeptide IKVAV. Bioactive IKVAV Peptide-Amphiphile (IKVAV-PA) was first synthesized and purified, the property of which was analyzed and determined by high-performance liquid chromatography (HPLC) and mass spectrometry (MS). Then, by addition of hydrogen chloride (HCl), self-assembly of IK-VAV-PA was induced in vitro and nano-fibers formed as shown by transmission electron microscopy (TEM). The effect of IKVAV nanofibers on adherence of PC12 cells was assayed in cell culture and the results showed that the rates of adherence of PC12 increased significantly when the density of IKVAV was within a certain range (0.58 microg/cm2 to 15.6 microg/cm2). However, its effect on the rates of adherence did not significantly alter with time, whether after 1 hour or 3 hours of culture. In general, we showed that IKVAV-PA can successfully self-assemble to form nanofiber, and promote rapid and stable adherence of PC12 cells, and the effect of the self-assembled IKVAV to promote PC12 cells adherence is dosage-dependent within a certain range of densities.

In this study, the bioactivity of a novel BMP2-derived oligopeptide P24 was investigated by using the model of rabbit femoral defect after loaded in the biodegradable poly (lactic acid / glycolic acid / asparagic acid-co-polyethylene glycol) (PLGA-[ASP-PEG]). A 1.5-cm unilateral segmental bone defect was created in the left femoral diaphysis in each of the 30 new zealand white rabbits. The defects of 18 legs filled with BMP2-derived peptide P24 combined with PLGA-[ASP-PEG] scaffold serves as the experimental group, and the defects in the rest 12 rabbits filled with (PLGA-[ASP-PEG]) without P24 as control group. The bone-repairing capability in the target region of the two group was grossly, radiologically, histopathologically and biomechanically evaluated 4, 8 and 12 weeks after the operation. Our results showed that in each group, primary healing of incision was achieved in the two groups. Radiographically, in experimental group, defects were filled with induced callus within 8 weeks, and a cortical bone-like structure was observed in some animals at the 12th week. According to the standardized stage of bone defect repair, 9 (64.28%) achieved grade-4 healing. In contrast, little bone formation was seen in the defects even 12 weeks after the operation, and 5 (62.50%) had grade 0 healing in this group. Histologically, tissue engineering material was mostly absorbed and cartilage was found around implants in the experimental group at the 4th week; 8 weeks after operation, the engineering material was completely absorbed, and formation of woven bone was observed and typical trabecular bone structure could be seen. In control group, 8 weeks after operation, the defect was filled with fibrous tissues, and no bone-like structure was observed. Statistical analysis showed very significant difference in biomechanical indicators between the two groups (P<0.05). It is concluded that new oligopeptide P24 can induce excellent bone regeneration and promote bone repair.

Objective To investigate the effect of simulated microgravity on the proliferation and differentiation of the human megakaryocyte cells in vitro. Methods The fourth generation rotating cell culture system (RCCS-4) was used to generate the simulated microgravity environment. The cell viability was assessed by trypan blue staining method. The proliferation of cells was assessed by cell counting method and CCK8 method. The CD41+/CD61+ cells rate and the cells cycle were detected by flow cytometry. The expression levels of thrombopoietin receptor (c-mpl) and transcription factors were detected with RT-PCR. Results After 24, 48, 72 h, culture under simulated microgravity resulted in a significant decrease in the cell number , proliferative activity, cells in the G2/M phase and levels of c-mpl mRNA expression in comparison with that under the normal gravity (P < 0.05). After 48 h and 72 h culture, CD41+/CD61+ cells ratio decreased and RUNX-1 mRNA expression was down-regulated in cells of the group SMG compared with that of the group NG (P < 0.05). Conclusion Microgravity can inhibit the proliferation and differentiation of human megakaryocyte cells in vitro. The mechanism may be that TPO/c-mpl pathway was inhibited by down regulating the expression of c-mpl which transcriptional inhibition lead to.