Solution Synthesis of Semiconducting Two-Dimensional Polymer via Trimerization of Carbonitrile.

The synthesis of crystalline two-dimensional polymers (2DPs) with proper bandgaps and well-defined repeating units presents a great challenge to synthetic chemists. Here we report the first solution synthesis of a single-layer/few-layer triazine-based 2DP via trimerization of carbonitrile at the interface of dichloromethane and trifluoromethanesulfonic acid. The processable triazine-based 2DP can be assembled into mechanically strong layered free-standing films with a high specific surface area via filtration. Moreover, the highly crystalline triazine-based 2DP can function as the active semiconducting layer in a field-effect transistor via drop coating and exhibits slightly bipolar behavior with a high on/off ratio of 103 and a remarkable mobility of 0.15 cm2 V-1 s-1.

The value of diffusion tensor imaging and fiber tractography in cervical spondylotic myelopathy / 中国骨伤

<p><b>OBJECTIVE</b>To study the diagnostic value of diffusion tensor imaging (DTI) in cervical spondylotic myelopathy.</p><p><b>METHODS</b>Twenty healthy volunteers and fifty patients with cervical spondylotic myelopathy underwent DTI in the Affiliated Hospital of Medical College of Ningbo University from January 2014 to April 2015. Healthy volunteers served as controls. Fifty patients were divided into three groups (group A , B, C) according to cervical MRI scan standard. Group A (17 cases) had only the dura mater spinalis compressed; Group B (23 cases) showed the cervical spinal cord compressed, but no high signal in it; Group C (10 cases) had the cervical spinal cord compressed with high signal in the same level. The average apparent diffusion coefficients(ADC) and fractional anisotropy (FA)values in these examinee were analyzed and all subjects were performed fiber tracking.</p><p><b>RESULTS</b>There was no statistically significant differences in ADC and FA values in C2/C3, C3/C4, C4/C5, C5/C6, C6/C7 of control group (P>0.05). The average ADC and FA values in control group were (0.875 +/- 0.096) x10(3) mm2/s and 0.720 +/- 0.051, respectively; compared with group A,there was no statistically significant difference; compared with group B and C, there was significant difference; comparison among group A, B, C, there was significant differences.</p><p><b>CONCLUSION</b>DTI can early and accurately quantify the changes of microstructure in cervical spondylotic myelopathy. Fiber tracking can show the damage range of spinal cord lesions.</p>

Diagnostic value of 3D-indirect magnetic resonance arthrography in detecting meniscal tears of the knees / 中国骨伤

<p><b>OBJECTIVE</b>To explore the diagnostic value of 3D-indirectmagnetic resonance (MR) arthrography in detecting meniscustears of the knees.</p><p><b>METHODS</b>Form January 2013 to January 2014, routine plain MR of the knees followed by the 3D-indirect MR arthrography was performed in 42 patients with suspected meniscal tears clinically. There were 31 males and 11 females, with an average age of 38.4 years old (ranged, 21 to 67 years old). The duration of the course ranged from 2 h to 15 d. The clinical symptom was knee pain. All the patients got subsequently arthroscopic examination or operation. The sensitivity and specificity of routine plain MR and 3D-indirect MR arthrography were compared based on the results of arthroscopic examination or operation.</p><p><b>RESULTS</b>The signal intensity in the area of meniscal tears on image of 3D-indirect MR arthrography was obviously higher than that of routine plain MR. The sensitivity of 3D-indirect MR arthrography was 85.79% (87/102), while the routine plain MR was 52.94% (54/102), and the specificity improved from 67.78%(61/90) to 86.67%(78/90). The difference was statistically significant (χ2 = 25.90, P < 0.01; χ2 = 9.13, P < 0.01).</p><p><b>CONCLUSION</b>In comparison with the routine plain MR findings, 3D-indirect MR arthrography demonstrates meniscus tears of the knee with the better sensitivity and specificity.</p>

External application of Algoplaque can control phlebitis caused by peripheral indwelling needle invein / 中国实用护理杂志

Objective To explore the effect of prevention and treatment of external application of Algoplaque for controlling phlebitis caused by peripheral indewelling needle in vein for patients. Methods This research was divided into two parts,prevention and treatment. As for prevention research,patients were randomly divided into the experimental and the control groups,each group included 30 patients. In the experimental group,we applied directly external application of Algoplaque at the upper of needle puncture site of the vein and nearby the eye. In the control group,we applied the film directly to fix the indwelling needle. As for the treatment research, it was carried out in patients with occurred phlebitis, who were randomly divided into two groups,the experimental group included 30 cases of patients and the control group included 28 cases of patients. Observation time was one to five days. Results The incidence of phlebitis in the experimental group of prevention research was 23%, in the control group it was 90%. The incidence of phlebitis in the experimental group was significantly lower than that of the control group. The effective rate in the experimental group of treatment research was 96.7% and it was 67.9% in the control group. The difference was very significant. Conclusions External application of Algoplaque can effectively control phlebitis caused by peripheral indewelling needle in vein.