Alveolitis, Extrinsic Allergic ; Female ; Humans ; Librarians ; Middle Aged

Sleep quality is closely related to human health. It is very important to correctly discriminate the sleep stages for evaluating sleep quality, diagnosing and analyzing the sleep-related disorders. Polysomnography (PSG) signals are commonly used to record and analyze sleep stages. Effective feature extraction and representation is one of the most important steps to improve the performance of sleep stage classification. In this work, a collaborative representation (CR) algorithm was adopted to re-represent the original extracted features from electroencephalogram sig- nal, and then the kernel entropy component analysis (KECA) algorithm was further used to reduce the feature dimension of CR-feature. To evaluate the performance of CR-KECA, we compared the original feature, CR feature and readied CR feature (CR-PCA) after principal component analysis (PCA). The experimental results of sleep stage classification indicated that the CR-KECA method achieved the best performance compared with the original feature, CR feature, and CR-PCA feature with the classification accuracy of 68.74 +/- 0.46%, sensitivity of 68.76 +/- 0.43% and specificity of 92.19 +/- 0.11%. Moreover, CR algorithm had low computational complexity, and the feature dimension after KECA was much smaller, which made CR-KECA algorithm suitable for the analysis of large-scale sleep data.
Algorithms ; Electroencephalography ; Entropy ; Humans ; Polysomnography ; Principal Component Analysis ; Sleep Stages ; Sleep Wake Disorders ; diagnosis ; Software

BACKGROUND:Recent studies have demonstrated that surgical trauma leads to lipid peroxidation in erythrocytes.However,injured erythrocytes play an important role in thrombosis following replacement.OBJECTIVE:To evaluate the influence of artificial total knee replacement on the lipid peroxdation in erythrocytes,and the prophylactic treatment of vitamin E and fructose 1,6 diphosphate(FDP)on it.DESIGN,TIME AND SETTING:Contrast clinical study,which was carried out in the Department of Otthopaedics,Affiliated Hospital of Nantong University from January 2003 to June 2006.PARTICIPANTS:Sixty patients with knee osteoarthritis who underwent artificial total knee replacement by anesthesia of epidural block were divided into four groups,including control group,vitamin E group,FDP group and vitamin E+FDP group,with 15 cases in each group.METHODS:Vitamin E was orally taken in the vitamin E group three days before replacement,three times a day,100 mg for each.The administration was performed until the surgical morning.Thirty minutes after the operation,FDP(10 g)was intravenously dripped in the FDP group.Additionally.vitamin E was also orally taken in the vitamin E+FDP group three days before replacement,three times a day,100 mg for each;on the surgical morning,FDP(10 g)was intravenously dripped on the first 30minutes.Blood samples were taken for biochemical determination before and after the operation at 1,3,5,and 7 days.MAIN OUTCOME M[EASURES:Corltents of malonaldehyde(MDA)and cuprum/zincum/superoxide dismutase (Cu-Zn-SOD)in the erythrocytes.RESULTS:MDA level in the vitamin E group and FDP group was significantly higher than that in the vitamin E+FDP group before and 5 and 7 days after replacement(P<0.05);while,Cu-Zn-SOD level was significantly lower(P<0.05).Otherwise,there were no significant differences in vitamin E+FDP group before and after replacement(P>0.05).CONCLUSION:The artificial total knee replacement can enhance lipid peroxidation and decrease antioxygen capability.However,the combination of vitamin E and FDP can prevent and relieve lipid peroxidation and antioxygen capability after replacement.

Atomic force microscopy has become an important tool for studying biological samples based on its high spatial resolution, high force resolution and the capability of working at physiological conditions. This article reviewed the application of AFM imaging and force measurement in biology and medicine.

Objective To investigate the experimental condition of separate purification and directed differentiation potency of pancreatic stem cells of adult rats in vitro. Methods The pancreas of adult rats were digested by collagenase V in situ perfusion. Filtration was performed by 100 mesh filter. Ficoll 400 density gradient centrifugation was used to separate pancreatic stem cells and stem cells were for cultivation. Epidermal growth factor (EGF), fibroblast growth factor (bFGF) was added to medium for in vitro cultivation.Immunofluorescence staining method was used to detect the expression of CK19, Pdx-1, nestin, insulin and glucagon, and the positive cell rate was calculated. The differentiated cell was evaluated by dithizone (DTZ)staining; insulin excretion function was determined by optical enzyme labeled ELISA staining. Results The pancreatic stem cell obtained from the study could be cultivated in vitro for 8 generations. The expression of CK19, Pdx-1 and nestin of the tem cells were all positive, and the rate of positive cells were (88.6 ± 6.2)% ,(84.6 ±8.6)% and (81.3 ±7.5)%. The differentiated cell was in brownish red color by DTZ dye. After high concentration sugar stimulation, the expression of insulin secretion was increased in the supernatant.Conclusions This method can harvest highly purified, and large amount of pancreatic duct stem cell.Artificial induction may result directed differentiate for islet-like clusters and have insulin secrete function.

Objective: Our aims were to measure DNA content in primary lung cancer and to study the relationship between the DNA content and TNM stage, histological differentiation of tumor cell, cellular proliferation, and apoptosis. Methods: The DNA content and cellular proliferation were analyzed using flow cytometry. Tumor cell apoptosis was detected by using TUNEL method. Results: (1) The DNA index (DI) distribution ranged from 0.829 to 2.514. There were 41 cases (77.4%) of DNA aneuploid. The distribution of DI and DNA aneuploid was independent of histological subtypes（P>0.05）.(2) With the increase of TNM stage, the DI and the rate of DNA aneuploid increased（P<0.05）.(3) There was relationship between DI and histological differentiation of tumor cell. The DI was higher in tumors of poor differentiation than those in tumors of moderate and good differentiation（P<0.05 and P<0.01）. (4) The cellular proliferation index of aneuploid tumors was significantly higher than that of diploid tumors(P<0.01), while apoptosis index of aneuploid tumors was significantly lower than that of diploid tumors (P<0.01). Conclusion: Correlations exist between DNA content and TNM stage, hiological differentiation, cellular proliferation, and apoptosis.

Objective To evaluate antimicrobial activity of fosfomycin combined with tigecycline against Klebsiella pneumoniae carbapenemase (KPC)-producing Klebsiella pneumoniae and study the mechanism of drug resistance to fosfomycin. Methods Broth microdilution method was used to independently determine the minimum inhibitory concentrations (MIC)of fosfomycin and tigecycline against 42 Klebsiella pneumoniae isolates (including 20 KPC-producing and 22 KPC non-producing isolates).Checkerboard design method was applied to evaluate combined effect of different concentrations on antimicrobial susceptibility and calculate the fractional inhibitory concentration index (FICI).FICI=MICfosfomycin joint/MICfosfomycin monotherapy +MICtigecycline joint/MICtigecycline monotherapy .Related interpretation criteria were as following:FICI≤0.5 means synergy;0.5 2 means antagonism.The fosfomycin resistant genes in KPC-producing Klebsiella pneumoniae isolates were screened.The data were analyzed by t test.Results Antimicrobial susceptibility testing results indicated the fosfomycin and tigecycline susceptibility rates in KPC-producing isolates were 35 .0%(7/20)and 70.0% (14/20 ),respectively.The susceptibility rates of drug combination increased to 50.0% (10/20 )and 95 .0% (19/20 ),respectively,with both MIC decreased.MIC of tigecycline decreased significantly after combination therapy and showed a statistical significance compared with the MIC of monotherapy (t = - 2.596,P = 0.013 ),whereas there was no significant difference between single and combined therapy of fosfomycin (t=-1 .274,P =0.211).FICI indicated that a total of 60.0%isolates showed synergy and additive effects between two antimicrobial agents,followed by indifference (40.0%),but there was no antagonism effect.Among 22 KPC non-producing isolates,there were 54.5 %showing indifference effects,followed by additive (31 .8%)and synergy (13.6%)effects.No antagonism effect was found.The study also identified two isolates with fosA resistant gene which located on the same plasmid as well as the bla KPC gene.The plasmid sizes in the two isolates were 138.9 kb and 104.5 kb, respectively.Conclusions KPC-producing Klebsiella pneumoniae are more susceptible to tigecycline. Combined use of two antimicrobial agents mainly exerts synergy and additive effect rather than antagonism,which may suggest the combination therapy strategy could inhibit the activity of KPC-producing Klebsiella pneumoniae .

Objective:To evaluate the role of hemopexin (HPX) in cerebral ischemia-reperfusion (I/R) injury in rats.Methods:One hundred and twenty healthy male Sprague-Dawley rats, aged 7-8 weeks, weighing 250-280 g, were divided into sham operation group (S group, n=36), cerebral I/R group (I/R group, n=36), vehicle group (V group, n=24), and HPX group ( n=24). The model of cerebral I/R injury was established by 120 min middle cerebral artery occlusion followed by reperfusion in anesthetized rats.At 6, 12 and 24 h of reperfusion, 4 rats in S group and I/R group were sacrificed, and the ischemic penumbra of the ipsilateral cerebral cortex was obtained to detect the expression of HPX by Western blot.In I/R, V and HPX groups, 0.9% normal saline 10 μl, 0.1% NaN 3 10 μl, and 1.86 mg/ml HPX 10 μl were injected into the lateral ventricle, respectively, immediately after reperfusion.Eight rats in each group were selected, and neurological deficit was scored at 1-7 days of reperfusion.Eight rats in each group were sacrificed at 1 and 7 days of reperfusion, brains were removed, and brain tissues were obtained for measurement of infarct size, and the percentage of infarct size was calculated. Results:Compared with S group, the expression of HPX in cerebral ischemic penumbra was significantly up-regulated at 24 h of reperfusion in I/R group, and the neurological deficit scores were significantly decreased at 1-7 days of reperfusion, and the percentage of cerebral infarct size was increased at 1 and 7 days of reperfusion in I/R, V and HPX groups ( P<0.05). Compared with I/R group, the neurological deficit scores were significantly increased at 1-7 days of reperfusion, and the percentage of cerebral infarct size was decreased at 1 and 7 days of reperfusion in HPX group ( P<0.05), and no significant change was found in the above indicators in V and I/R groups ( P>0.05). Conclusion:Up-regulation of HPX expression is the endogenous protective mechanism of cerebral I/R injury in rats.

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.

Background Anti-VEGF drugs are generally applied in the treatment of ocular neovascular diseases.However,the therapy effect is unsatisfactory in some patients.Studing the effect of hypoxia-inducible factor-1 (HIF-1),a upstream regulatory gene of VEGF,and its limiting enzyme prolyl-4-hydroxylase domain proteins (PHDs) is of important clinical significance.Objective This study was to investigate the negtive regulation of exogeneous PHDs on HIF-1 pathway in human RPE cells.Methods pFLAG-PHD1,pFLAG-PHD2 and pFLAG-PHD3 plasmids were constructed by extracting RNA from Hela cell line and coloning PHD1,PHD2 and PHD3 using reverse transcription PCR with restriction enzyme.The plasmids were identified by gene sequencing.ARPE-19 cells were cultured at 21％ O2 (normoxia group),1％ O2 (hypoxia group),or in hypoxia-mimicking agents (CoCl2,anoxia group),respectively,and then were transfected with plasmids encoding FLAG-tagged PHD1,PHD2,PHD3 and pFLAGCMV2 transfected cells served as blank control.The expressional intensities of PHD1,PHD2 and PHD3 in the cells were detected and compared among different groups by using Western blot assay.The transcriptional activity of HIF-1 in the cells was evaluated with dual luciierase reporter assay.Results Western blot assay showed that PHD1,PHD2 and PHD3 all were expressed in ARPE-19 cells in the normoxia group,hypoxia group and anoxia group.The expression was strong in PHD2 protein and was weak in PHD3 protein,a statistically significant difference was found between PHD2 protein expression and PHD1 or PHD3 expressions (all at P＜0.05).Endogenous HIF-1 activity was elevated in pFLAG-CMX transfected cells in the hypoxia group and anoxia group than that in the normoxia group.Compared with pFLAG-CMX transfected cells,no obvious change was seen in the endogenous HIF-1 activity in the normoxia group,however,HIF-1 activity was declined in the hypoxia group and anoxia group after pFLAG-PHD1,pFLAG-PHD2 or pFLAG-PHD3 transfection.Under the same oxygen environment,HIF-1 activity was lower in the pFLAG-PHD2 transfected cells than that in the pFLAG-PHD1 or pFLAG-PHD3 transfected cells (both at P＜0.05).Conclusions PHDs play a negative regulation to HIF-1 activating pathway in human RPE cells,especially in hypoxia and anoxia cells.Among PHDs proteins,PHD2 presents the strongest inhibition on HIF-1 activating pathway.