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BACKGROUND: Our study aimed to investigate the Hub genes and their prognostic value in colorectal cancer (CRC) via bioinformatics analysis. METHODS: The data set of colorectal cancer was downloaded from the GEO database (GSE21510, GSE110224 and GSE74602) for differential expression analysis using the GEO2R tool. Hub genes were screened by protein-protein interaction (PPI) comprehensive analysis. GEPIA was used to verify the expression of Hub genes and evaluate its prognostic value. The protein expression of Hub gene in CRC was analyzed using the Human Protein Atlas database. The cBioPortal was used to analyze the type and frequency of Hub gene mutations, and the effects of mutation on the patients' prognosis. The TIMER database was used to study the correlation between Hub genes and immune infiltration in CRC. Gene set enrichment analysis (GSEA) was used to explore the biological function and signal pathway of the Hub genes and corresponding co-expressed genes. RESULTS: We identified 346 differentially expressed genes (DEGs), including 117 upregulated and 229 downregulated. Four Hub genes (AURKA, CCNB1, EXO1 and CCNA2) were selected by survival analysis and differential expression validation. The protein and mRNA expression levels of AURKA, CCNB1, EXO1 and CCNA2 were higher in CRC tissues than in adjacent tissues. There were varying degrees of immune cell infiltration and gene mutation of Hub genes, especially B cells and CD8 + T cells. The results of GSEA showed that Hub genes and their co-expressed genes mainly participated in chromosome segregation, DNA replication, translational elongation and cell cycle. CONCLUSION: Overexpression of AURKA, CCNB1, CCNA2 and EXO1 had a better prognosis for CRC and this effect was correlation with gene mutation and infiltration of immune cells. [ABSTRACT FROM AUTHOR]

Organic-inorganic halide perovskite CH 3 NH 3 PbI 3 films were synthesized by low-temperature solution method by using a two-step spin-coating technique. We detailedly investigated the effect of the concentration of CH 3 NH 3 I solution on the morphology and optical properties of CH 3 NH 3 PbI 3 films, and a regular morphology evolution was observed. Further, temperature-dependent photoluminescence measurement was performed, and a structural phase transition of the CH 3 NH 3 PbI 3 films at 150 K was revealed by examining the temperature dependence of the peak positions and widths. In addition, the corresponding exciton binding energy and optical phonon energy of the CH 3 NH 3 PbI 3 films were extracted in the high-temperature tetragonal phase based on the experimental data. It can be anticipated that our results obtained provide valuable information for the understanding on the optical properties of perovskite CH 3 NH 3 PbI 3 , and also their future applications in optoelectronic devices. [ABSTRACT FROM AUTHOR]

In this paper, we present a detailed investigation on the optical properties of a solution-processed organic–inorganic halide perovskite CH3NH3PbI3 thin film. Using temperature-dependent photoluminescence measurements, a structural phase transition from the tetragonal to orthorhombic phase states was observed at a critical temperature of ∼160 K. Our results revealed an exciton binding energy of 45.5 ± 12.6 meV and an optical phonon energy of 37 ± 5.9 meV, along with an abnormal blue-shift of the bandgap in the high-temperature tetragonal phase. Interestingly, under high density optical pumping, a coherent random lasing action was observed at room-temperature with a threshold energy of 102 μJ cm−2, which can be ascribed to the high optical gain and strong multiple scattering provided by the polycrystalline gain boundary in random gain media. The results obtained on the unique optical properties of the CH3NH3PbI3 thin film support the potential of such organic–inorganic perovskites for use in novel and low-cost semiconductor laser applications. [ABSTRACT FROM AUTHOR]

Amphibious vehicles have three operating conditions; on-water, on-land and water-land transition. At present, two main simulation methods have been used for amphibious vehicle. One is to use the multi-body dynamics software for simulation of on-land operating condition, and the other is to use CFD software for simulation of on-water operating condition. The methods are used to simulate a single operating condition. In order to solve the computing problem of dynamics under various operating conditions, a real-time control dynamic simulation system for all operating conditions of amphibious vehicle is established by using the coupling theory of particle flow field and collision and the calculating methods of multibody dynamics. Based on this, many virtual tests were completed. The test results were verified by taking a high-speed tracked amphibious vehicle for example. The results show that the proposed method has a certain degree of accuracy, and the calculation error is less than 15% compared to the experimental data. [ABSTRACT FROM AUTHOR]

Based on the pole assignment, the influence of performance was analyzed and the principle on rapidity and stability was clarified with the methods of root locus and feedback. It is concluded that the positive lever effect obviously decreases the velocity of frequency of autopilot, which varies along with the open loop gain. Hence, a two-loop autopilot with a high gain can be designed without compensation network. Or it can enhance the stability. So it is a method that the accelerometer is fixed before the gravity to improve performance of autopilot. The simulation result shows that the conclusion is proper and important. [ABSTRACT FROM AUTHOR]

Objective: To summarize the clinical characteristics and the therapy effect of blepharitis patients in clinic., Methods: Retrospective case series study.Four hundred and thirty-eight patients were diagnosed clinically as blepharitis in Beijing Tongren Hospital from Jan 2009 to July 2012. Analyzed the general states of health, case history, and the clinical manifestation, to summarize the clinical characteristics of blepharitis. The patients were clinically degree indexing and treated appropriately. After 1-2 courses of the treatment, the effect was analyzed.main outcome measures:manifestation of lid margin, corneal, conjunctiva, and the results of tear tests., Result: Four hundred and thirty-eight patients were recorded, from 3 to 84 years old, and the average was 40 ± 18 years old.435 (99.3%) cases were suffered with double eyes.159(26.3%) cases were males, and 279 (63.7%) cases were females. Children group had 41 cases (9.4%), which from 0 to 16 years old. Adult group (17-59 years) included 331 cases, which were 75.6% in the study. 66 cases were in aged group ( ≥ 60 years), being 15.0% in all cases.176 cases (40.2%) were on mild stage, 174 cases (39.7%) on middle stage, and 88 cases (20.1%) were on serious stage. Aged group were significantly more than children group (χ(2) = 34.575, P < 0.05).No significant difference between male and female (χ(2) = 32.877, P = 0.192). In 222 cases (50.7%) blepharitis patients complicated with correlation of keratoconjunctivitis lesions, respectively 8.5%, 75.3% and 86.4% in the mild, moderate, and severe patients. Adult group cases were significantly more than Children and aged group (χ(2) = 362.785, P < 0.05). Aged group were significantly more than Children group (χ(2) = 362.785, P < 0.05). 303 cases (69.2%)were with tear abnormal. The moderate and serious patients were more suffered with tear abnormal than mild patients (χ(2) = 64.438, P = 0.000). Patients were followed up for 1.5 to 27 months, mean 8 months. According to different extent of blepharitis, patients were given 1 courses of treatment.333 cases were clinical recovery, and the other cases were improved obviously., Conclusions: Blepharitis occurs mainly in adults.It always complicate with dry eye and keratoconjunctival lesions.It is needed pay attention to by Ophthalmologist. The diagnosis and grade is based on typical clinical symptoms. The treatment according different grades should focus on the correct handling of the palpebral margin.

Bacteria adherent on the active or inactive surface can form biofilms in which they are encased in a hydrated matrix of extracellular polymeric substances, which is so called bacterial biofilm (BBF). BBF has greater virulence and drug resistance, they can also evade the host immune system and lead to immune injury compared with planktonic bacteria. Many common medical infections involving ophthalmic infection are biofilm-associated. In this paper, the concept and biological characteristics of BBF and BBF-related ophthalmic infection were reviewed.

Infectious keratitis remains a severe ocular condition that can lead to irreversible complications and even blindness. An early diagnosis of an infective microorganism leading to effective treatment may improve the outcome of infectious keratitis.However, the accurate and rapid identification of the infectious agent remains a challenge for the ophthalmologist.In vivo confocal microscopy (IVCM) is a noninvasive imaging technique that provides high-resolution images of ocular surface structures at a cellular level and infectious keratitis represents one of its most important clinical uses. The value of IVCM has been demonstrated in the diagnosis of acanthamoeba and filamentous fungal keratitis. The follow-up of such corneal infections may also be improved by this noninvasive imaging technique.However, the current resolution of IVCM limits its use in cases of bacterial and viral keratitis.

Photodynamic therapy(PDT) as a new therapeutic method is increasing widely used in ocular surface disease. Along with intensive studies of microorganism inhibition and promoting function in tissue repairing of PDT have been developed, PDT been gradually applied to treating infectious keratitis in clinical. We review mechanism, sterilization and application in infectious keratitis of PDT.

Objective: To analyze the distribution and shifting trends of fungal culture specimens and assess the drug sensitivity in vitro., Methods: Case series study. From January 2009 to December 2010, 1302 specimens were collected. These specimens were cultured on potato dextrose agar medium under 28°C and 40% humidity for 3 - 8 days. Drug sensitivity of positive cultures were evaluated by K-B method. Chi-square test was used for the analysis., Results: In 1302 specimens, 292 samples (22.4%) were culture-positive, in which 69.9% were isolated from the cornea, 3.8% from the vitreous body, 1.0% from the anterior chamber, 0.7% from the conjunctiva, 0.7% from palpebral margin and 24.0% from other parts of the eye. Culture-positive rate of 2009 and 2010 were 21.2% (135/637) and 23.6% (157/665) respectively with no statistically significant difference (χ(2) = 1.092, P = 0.296). Two peaks of culture-positive outcome appeared in May and November. Culture results showed that Fusarium sp. was the commonest pathogen (59.6%, 174/292), Aspergrium sp. in 16.8% (49/292) and Alternaria sp.in 10.6% (31/292). Patients from 31 to 60 years old accounted for 82.2% (240/292) of positive cases. The sensitive rate in vitro to natamycin, terbinafine, fluconazole, amphotericin B and itraconazole was 94.0% (63/67), 63.4% (154/ 243), 6.0% (17/285), 39.7% (98/247) and 21.2% (65/306), respectively., Conclusions: The top three commonest fungus of Beijing Tong Ren hospital successively are Fusarium sp., Aspergrium sp. and Alternaria sp. Natamycin should be the first choice for fusarium infection and pathogen-unknown infection. All species with the exception of Fusarium sp. are sensitive to natamycin, terbinafine and amphotericin B but not itraconazole. Almost all fungal strains are resistant to fluconazole.

Objective: To realize the effectiveness and security of Tobramycin and Dexamethasone Eye Ointment for blepharitis treatment. Design Case control studies. Participants 148 patients be diagnosed as blepharitis including 81 cases as research group and 67 cases as control group., Methods: Multi-center randomized controlled clinical trial. The patients met the inclusion criteria from First Hospital Peking University, Beijing Tongren Hospital, Southwest Hospital, Ophthalmology Center Zhongshan University and Third Hospital Peking University were divided into two groups in Aug. to Dec. 2011. Tobramycin dexamethasone eye ointment was applied to eye lid in research group while patients in control group used tobramycin eye ointment. All patients were informed to apply warm compress to the lids, mechanically washing to the eyelids and artificial tears. At the beginning, the 7(th) day, the 14(th) day and the 28(th) day of treatment, observation of symptom, sign and side effect were recorded., Results: Before treatment the difference of the symptom scores of burning sensation, tears, photophobia and itch of two groups has no statistically significant (t = 1.87, 0.43, -0.64, 0.93, P > 0.05), but the symptom scores have a statistically significant decrease (t = 1.99 - 6.90, P < 0.05) at the 7(th) day, 14(th) day, 28(th) day. Before treatment the difference of signs scores have no statistically significant except the term of new blood vessels (t = 2.32, P = 0.02) while all the signs scores have a statistically significant decrease at the 7(th) day, 14(th) day, 28(th) day. Side effect: the number of patients with elevated intraocular pressure of research and control group is 3 and 1 respectively and the ratio is 3.7% and 1.5%., Conclusions: The tobramycin dexamethasone eye ointment can improve signs and symptoms of blepharitis patients. Some patients have to face with the risk of elevated intraocular pressure and it's necessary to monitor the intraocular pressure.

Objective: To investigate the cytological feature and differentiate diagnosis of ocular fungal infections by smear cytology., Methods: Experimental study. One thousand two hundred and twenty-six specimens of smear cytology were collected retrospectively during January 2007- December 2010 from Microbial Laboratory of Beijing Institute of Ophthalmology. The 1226 specimens analyzed in this study were collected from patients who suffered from ocular fungal infections. The corneal scraping cells were observed by Giemsa staining, and the photographic record was saved. The morphological characteristics of fungal pathogens and the surrounding cells were analyzed by light microscopy., Results: Nine hundred and ninety eight of 1226 (81.40%) specimens were positive with fungal pathogens, 228 of 1226 (18.60%) specimens were fungal negative by smear cytology. 976 of 998 (97.80%) fungal positive specimens were filamentous fungi positive, and 22 of 998 (2.20%) specimens were yeast positive. Among the 998 fungal positive specimens analyzed in this study, twenty-seven (2.71%) were collected from the vitreous, twelve (1.20%) were collected from aqueous humors, thirteen (1.30%) were collected from conjunctiva, seven (0.70%) were collected from eyelid margin, three (0.30%) were collected from lachrymal, and 8 were collected from other parts. The fungal pathogens should be differentiated from the deformed corneal epithelial cells, vacuoles, amebic cyst and other tissue cells during scraping., Conclusions: The smear cytology test for the diagnosis of ocular fungal infections has advantages of higher detection rate, less time-consuming and easier operation. The identification of fungal like ingredients is very important to improve the accuracy of diagnosis of ocular fungal infections.

It is very important to avoid inadequate patients to perform excimer laser keratectomy in order to prevent from surgical complications. The ametropic eyes with corneal guttata is considered very carefully whether to perform excimer laser corneal ablation or not, especially for the patient with corneal guttata companied by Fuchs endothelial dystrophy family history is contraindicated to perform laser corneal refractive surgery.