Users' cognition and information retrieval are faced with great challenges in ubiquitous knowledge environ-ment. The influence of cognitive factors such as personality traits, cognitive style and ability, knowledge structure and ascribed methods on users' information retrieval behaviors was thus analyzed. It was pointed out that different cognitive factors could influence the retrieval, judgment and absorption of its results,users' satisfaction and continuous use in ubiquitous knowledge environment,with suggestions put forward from the aspects of information retrieval education, information service and information users for improving the users ' knowledge system in knowledge assimilating process by working out effective retrieval strategies using the advantages of cognition.

Objective To study the effect of Sarcandra Glabra on the expression of signal transduction molecules of TGF-β1/Smads signaling pathway in miniature pig of radiation-induced lung injury.Methods 75 miniature pigs were divided into control group,radiation group and radiation plus medication group randomly.At 1 week before exposure of right lung with 15 Gy γ-rays,the miniature pigs in radiation plus medication group were given Sarcandra glabra,while those in the other groups received an equal amount of saline.Right lung were taken at weeks 2,4,8,12 and 24 after irradiation,the pathological changes in the lung tissue were observed by HE staining,and the expression of mRNA and protein of TGF-β1,Smad2,Smad3,and Smad7 were detected by real-time PCR and western blotting,respectively.Results Sarcandra glabra reduced the inflammation and fibrosis of the lung tissue in miniature pig after irradiation.Compared with control group,the expressions of TGF-β1 and Smad3 were significantly increased at 2 weeks after irradiation(P ＜ 0.05),Smad2 and Smad7 were increased at 8 and 12 weeks after irradiation(P ＜ 0.05),respectively,in the radiation group.Compared with the radiation group,the expressions of TGF-β1 and Smad2 were significantly decreased(P ＜ 0.05) from the fourth and eighth week,respectively,Smad3 had no obvious change while Smad7 was significantly increased from the second week in the radiation plus medication group (P ＜ 0.05).Conclusions Sarcandra Glabra plays protective effect on radiation-induced lung injury in miniature pig by regulating TGF-β1,Smad2 and Smad7 expressions in the TGF-β1/Smads signaling pathway.

Immune-checkpoint blockers(ICBs)have been well received in a variety of tumors,and the quality of patient life has improved significantly.However,the reasons why not all patients treated with ICBs benefit from lesion control,symptom improvement,and survival time.Many patients are resistant to the first time when they have been using ICBs for a period of time.This is a clinical challenge.This review lists possible causes of primary drug resistance and acquired resistance to ICBs.The primary resistance is associated with several mechanisms,including tumor microenvironment,cancer cells themselves and other related factors.The acquired resistance includes nonclassical immunoprecipitation molecules secondary overexpression,abnormalities of antigen presenting signal pathway and dysfunction of T cell activation killer.Finally,we have described a variety of possible new combination of treatment,including combined radiotherapy and chemotherapy,and combined targeted therapy with other measures.

Objective To investigate surgical strategy and outcome for cervical metastasis in different anatomical segments.Methods Data of 31 patients,who had undergone surgical treatment for cervical metastasis from 2001 to 2009,were retrospectively analyzed.Two anatomical regions were defined:upper cervical spine (C1 and C2)and subaxial cervical spine plus cervicothoracic junction (C3-T1).VAS score,Frankel grade,Tomita score and Karnofsky performance scale were used to evaluate pain,neurological status,expected survival time and general health.The improvement of symptoms,survival time and characteristics of surgical strategies for different anatomical regions were analyzed.Results Twenty-four patients were followed up successfully.An effective recovery in neck pain and quality of life was found after operation.The median survival time was 45.0 months.In upper cervical spine group,the surgical strategies included posterior occipitocervical fixation combined with 125I seed brachytherapy and other surgical methods,and the median survival time 48.0 months) of patients who underwent 125I seed brachytherapy was longer than that 22.0 of patients treated with other surgical methods.In C3-T1 metastasis group,patients who underwent combined anterior-posterior approach total spondylectomy had a longer survival time than those treated with anterior corpectomy.Conclusion Surgical treatment can effectively relief neck pain,maintain or improve neurological function and improve quality of life.Doctors should choose different surgical strategies according to anatomical region of cervical metastasis.For upper cervical spine,the main purpose of surgery is to stabilize the cervical spine; the posterior occipitocervical fixation is usually chosen,and the 125I seed brachytherapy is useful in local control of metastasis.For subaxial cervical spine and cervicothoracic junction,the anterior corpectomy is usually chosen,and a combined anterior-posterior approach total spondylectomy can be used for patients with corresponding conditions.

Paired basic amino acid cleaving enzyme 4 (PACE4),a subtilisin-like endoprotease,which is thought to play a significant role in tumor occurrence and development.Its over or low expression may lead to enhanced proliferation and invasion of tumor cells,and even increase the malignant degree.The specific regulation according to the roles of PACF4 expression in different tumors may be helpful for tumor treatment and prognosis improvement.

Objective To investigate the imaging manifestation of immature teratoma.Methods Imaging features of 9 cases of immature teratoma.confirmed pathologically were retrospective analysed.Results All 9 cases were male,age ranging from 1 to 38 years,mean age 1 9.5 years,AFP increased varying degrees in six cases .(1)3 cases (mean age 25.5 years)located in the anterior mediastinum which CT characteristics included the following features:lesions were projecting to one side,with irregular shape,obvi-ous necrosis,mild enhancement,wrap or oppression the blood vessels,one case with superior vena cava and head arm vein tumor em-boli and mediastinal lymph node metastasis.(2)6 cases (mean age 9.5 years)located in the pineal region and tricorn region,which MR finding were as following :cystic or solid placeholders,tow cases with small calcification or fat,solid part and the capsule wall enhancement significantly,4 cases with nodular enhancement.Conclusion Immature teratoma tends to occur in the middle struc-ture,and appears in children and young adults frequently,necrosis and cystic changes are seen commonly.CT and MR are of high val-ue in diagnosing immature teratoma.

In order to improve the interfacial bonding strength of hydroxyapatite/polyurethane implanted material and dispersion of hydroxyapatite in the polyurethane matrix, we in the present study synthesized nano-hydroxyapatite/polyurethane composites by in situ polymerization. We then characterized and analyzed the fracture morphology, thermal stability, glass transition temperature and mechanical properties. We seeded MG63 cells on composites to evaluate the cytocompatibility of the composites. In situ polymerization could improve the interfacial bonding strength, ameliorate dispersion of hydroxyapatite in the properties of the composites. After adding 20 wt% hydroxyapatite into the polyurethane, the thermal stability was improved and the glass transition temperatures were increased. The tensile strength and maximum elongation were 6.83 MPa and 861.17%, respectively. Compared with those of pure polyurethane the tensile strength and maximum elongation increased by 236.45% and 143.30%, respectively. The composites were helpful for cell adhesion and proliferation in cultivation.
Biocompatible Materials ; chemistry ; Cell Adhesion ; Cell Line ; Durapatite ; chemistry ; Humans ; Polymerization ; Polyurethanes ; Tensile Strength ; Transition Temperature

Objective To explore the characteristics of cesarean scars pregnancy(CSP)and discuss differ-ent therapeutic methods and clinical outcomes. Methods Clinical data of 96 cases of CSP were collected from Sep-tember 2013 to October 2016 and patients′ clinical features,intra-operative findings,β-HCG,vaginal bleeding duration,hospital stay and cost and effects of different treatments were recorded and analyzed. Results The types of CSP were the determinant of lesion resection ,followed by the tumor size and blood β-HCG levels. The cases of uterine lesion resection and general uterine curettage with UAE had less blood loss than those without UAE. The cases of uterine lesion resection had short hospital stay and those with general uterine curettage had longer vaginal bleeding duration. Conclusion TVCD and MRI have important values in the diagnosis of CSP. During the treatment of CSP,personalized treatment planning,early diagnosis and treatment exert influence on reducing complications.

Objective To explore the scanning technology of head-neck-coronaryone-stop-shopCT angiography using 256-slice iCT and complete image quality analysis.Methods 106 consecutive patients underwent 256-slice iCT head-neck-coronaryone-stop-shop CT angiography.According to the average heart rate,patients were divided into three groups,the 1ow heart rate group with the average heart rate ranged from 40 to 60,medium heart rate group with heart rate from 60 to 80 beats per minute and high heart rate group with heart rate more than 80 beats per minute.The volume rendering (VR),maximum intensity projection (MIP), multi-planar reformation (MPR)and curved planar reconstruction (CPR)were employed for three-dimensional reconstruction after the original image reached to the iCT post-processing workstation.The image quality of head-neck artery and coronary artery were assessed by two senior radiologists individually .Results The image quality scores in the three groups show statistic significance (F=14.886 , P =0.000).The difference between low heart rate group and medium heart rate group show statistic significance (P =0.031).The difference between low heart rate group and high heart rate group was statistical significant (P = 0.026 ).There was no statistic difference between medium heart rate group and high heart group.The excellent rates of coronary artery image quality reached to 100%,96.6%,92.6% in low,medium and high heart rate group respectively.The rates of excellent about head-neck vascular im-age quality in the three groups reached to 100%.Conclusion 256-slice iCT head-neck-coronaryone-stop-shopCT angiography can obtain satisfactory image.The image quality does not decrease in patients with high heat rate.

To investigate the TGFβ1-induced epithelial-mesenchymal transition (EMT) of Huh7 hepatoma cells caused by interaction of hepatitis B spliced protein (HBSP) with transforming growth factor beta-1-induced transcript 1 protein (TGFβ31I1),coding region of HBSP was cloned into lentiviral expression vector.Huh7 hepatoma cells were infected by recombinant lentivirus packaged in 293T cells.Stable cell lines expressing HBSP or control cells were selected by puromycin.Cells were incubated with 5 ng/mL TGFβ1 for 24 h,and observed under contrast-phase microspcope.Then the whole cell lysates were collected for western blot analysis using specific antibodies against EMT markers including E-cadherin,N-cadherin,Claudin-1 and β-catenin.To evaluate the effects of HBSP-TGFβ1I1 interaction on EMT,TGFβ1-induced EMT marker transition,as well as cell invasion and migration were explored after knocking down of TGFβ1I1 by siRNA.Results showed that Huh7 cell lines expressing HBSP (Huh7-HBSP flag-HIV) and control cell lines (Huh7-flag-HIV) were successfully established.Huh7-HBSP flag-HIV cells lost their pebble-like shape and tight cell-cell adhesion and transformed into the mesenchymal-like cells in the presence of TGFβ1.Decreased expression level of epithelial marker of E-cadherin,Claudin-1,β-catenin,increased expression level of mesenchymal marker of N-cadherin,and enhanced migration and invasion abilities were observed in Huh7-HBSP-flag-HIV cells as compared to the control cells.Moreover,the changes of EMT markers and metastasis abilities of Huh7-HBSP-flag-HIV cells could be reversed when TGFβ111 was knocked down by siRNA.In conclusion,HBSP could promote hepatoma cell migration and invasion by triggering EMT via interaction with TGFβ111.Our findings highlight new insights for HBSP-induced HCC progression.