Objective To improve the image reconstruction quality of diffusion-weighted imaging with high acceleration factor for accelerating the acquisition.Methods Image block matching method was used to extract similar image blocks in diffusion-weighted images for low-rank constraint and sparseness constraint,and it was integrated into the traditional sensitivity encoding(SENSE)parallel reconstruction algorithm to improve image reconstruction quality and reduce image noise.Two sets of human data were collected in the experiments.The reconstructed results using traditional SENSE reconstruction,total variation constraint-based SENSE(SENSE-TV)reconstruction and the proposed method were compared at 3×and 4×accelerations.The errors of the diffusion images and fractional anisotropy(FA)maps with the reference images from fully sampled data were quantitatively calculated.Results Compared with traditional SENSE and SENSE-TV methods,the proposed method resulted in the reconstructed diffusion images with higher image quality and lower image errors in the 3×and 4×acceleration experiments.The quantitative analysis showed that the FA calculated by the proposed method was more accurate and had lower errors.Conclusion By constraining low-rank and sparseness of similar image blocks from images in reconstruction,it is expected to achieve high image quality under high acceleration factor.

Objective:To explore the value of clinical data and MRI image features in predicting and analyzing the degree of differentiation of hepatocellular carcinoma (HCC).Methods:The clinical and imaging data of 180 patients with surgical outcomes of HCC from March 2015 to June 2019 in the General Hospital of Ningxia Medical University were retrospectively analyzed. Alpha-fetoprotein (AFP)、aspartate aminotransferase (AST)、D-dimer、clinical stage、tumor length、apparent diffusion coefficient(ADC)、enhancement types and so on the clinical and imaging data of the poorly differentiated and non-differentiated HCC were compared and analyzed. Multivariate logistic regression was used to predict independent risk factors for poorly differentiated HCC.Results:Of the 180 HCC patients, 121 were moderately and highly differentiated, and 59 were poorly differentiated. Univariate analysis showed that the patient’s age, gender, AFP, AST, D-dimer level, clinical stage, Child-Pugh score, tumor length, whether the capsule was complete, tumor apparent diffusion coefficient, the maximum level ADC value, enhancement type with HCC differentiation degree were correlated(all P<0.05). Multivariate logistic regression analysis showed that the patients' gender ( OR=4.524, P<0.05), clinical stage ( OR=5.598, P<0.05), D-dimer ( OR=8.576, P<0.05), HCC diameter ( OR=0.498, P<0.05), enhancement types ( OR=2.988, P<0.05), tumour ADC value ( OR=0.059, P<0.05) were independent of poorly differentiated HCC risk factor. Conclusion:MRI image features can be used as an effective indicator to predict the degree of HCC differentiation before surgery. It is more valuable to accurately predict the degree of HCC combined with D-dimer and AFP value.

Objective:To analyze the imaging features of spontaneous rupture of primary liver cancer (PLC) and to study the high-risk factors associated with tumor rupture.Methods:From September 2016 to August 2020, 81 patients who developed spontaneous rupture of PLC at the General Hospital of Ningxia Medical University were included into this study. A control group of 81 patients with tumors located on the periphery of the liver but without rupture treated in the same period were selected by matching the two groups with age, sex and BCLC staging. The clinical data and CT imaging characteristics including tumor location, extent, size, and morphology of the two groups of patients were compared retrospectively between groups.Multivariate logistics regression was used to analyze.Results:A total of 81 patients were included in the case group, including 72 males and 9 females, aged (53.69±10.34) years. The control group included 81 patients, 64 males and 17 females, aged (54.78±9.04) years. The main risk factors for spontaneous rupture of PLC included in this study were cirrhosis, tumor close to diaphragm, biolobar distribution, portal vein obstruction, tumor diameter >10 cm, invasion of liver capsule (arc-to-chord ratio>1) and tumor protrusion ≥25% ( P<0.05). Logistic regression analysis showed that cirrhosis ( OR=2.796, 95% CI: 1.721-10.834), portal vein obstruction ( OR=3.586, 95% CI: 1.272-10.107) and tumor protrusion (≥25%) ( OR=2.831, 95% CI: 1.668-22.210) were independent predictive factors of spontaneous rupture of PLC. Conclusion:Tumor protrusion≥25%, cirrhosis and portal vein obstruction were closely related to spontaneous rupture of PLC. They were independent risk factors in predicting rupture of primary liver cancer.

Objective:To study preoperative MRI imaging and its enhanced mode on tumor features in predicting microvascular invasion (MVI) in patients with hepatocellular carcinoma (HCC).Methods:The clinical data of patients with a solitary HCC who underwent MRI examination followed by surgical resection at the General Hospital of Ningxia Medical University from January 2017 to June 2019 were studied. The patients were divided into the MVI (+ ) and MVI (-) groups according to the findings on postoperative pathological diagnosis. The relationship between the rates of MVI and MRI tumor features including diffusion weighted imaging (DWI) signal, enhancement mode, enhancement type and other imaging characteristics were analysed.Results:Of 84 patients with HCC enrolled into this study, there were 65 males and 19 females. Their age (Mean±SD) was (54.94±11.51) years. MVI (+ ) was found in 46 patients and MVI (-) in 38 patients. The maximum tumor diameters (Mean±SD) of the two groups were (7.08±3.45) cm and (4.28±2.47) cm ( P<0.01). Single-factor analysis and comparison of imaging characteristics of the two groups of patients showed tumor DWI signal, tumor encapsulation, enhancement mode, tumor edge smoothness, abnormal enhancement around tumors, and intratumoral arteries were significantly different ( P<0.05); There were no significant differences in T 1WI signals, T 2WI signals, tumor periphery, and enhancement types between groups. After inputting MVI(+ ) as a risk factor into the logistic regression model, tumor maximum diameters >6.33 cm, type 3/4 enhancement mode, and unsmoothness of tumor edge were independent risk factors (all P<0.05). Through combined diagnosis using ROC curve analysis with a cut-off value of 0.53, the area under the curve was 0.881, the sensitivity 0.870, specificity 0.789, and the Youden index 0.659. Conclusion:The multivariate logistic regression model and combined diagnosis using ROC curve analysis improved the diagnostic efficacy of MVI in its prediction of HCC on imaging studies. The risk predictors were easy to use and to promote in clinical practice.

Objective:To evaluate the radiation doses from head and chest CT examinations of children in Ningxia, and provide basic data for the optimization of CT radiation doses to children of different ages.Methods:By using stratified cluster sampling method , the dose parameters on head and chest CT scanning, CTDI vol and DLP for the children under 15 years old were sampled within 1-2 weeks from hospitals at different levels in different regions of Ningxia for the calculation of effective doses. The 75th percentile (P75) of CTDI vol and DLP was compared with those recommended by other countries. All children included four age groups: up to 1 year old, 1 to 5 years, 6 to 10 years, 11 to 15 years. Results:There were 39 hospitals and 47 CT scanners in this survey, and 1 134 head scanning and 636 chest scanning were investigating. The 75th percentile (P75) of CTDI vol and DLP for head scanning were 44.2 mGy and 456.2 mGy·cm for those up to 1 year old; 57.2 mGy and 659.6 mGy·cm for 1 to 5 years old, 61.1 mGy and 668.7 mGy·cm for 6-10 years old, and 63.6 mGy and 849.3 mGy·cm for 11-15 years old, respectively. The 75th percentile (P75) of CTDI vol and DLP for chest scanning were 5.0 mGy and 89.2 mGy·cm for those up to 1 year old, 5.9 mGy and 124.8 mGy·cm for 1 to 5 years old, 6.0 mGy and 167.9 mGy·cm for 6 to 10 years, and 7.1 mGy and 235.0 mGy·cm for 11 to 15 years old, respectively. Conclusions:The chest CT radiation dose to children in Ningxia is close to the reported values, but the head CT radiation dose is relatively high in all age groups, especially in infants. The optimization and regulation of head CT radiation doses to children in Ningxia should be strengthened. It is high time to increase dose awareness for pediatricians and radiologists and raise awareness of radiation-related risks.

Objective:To investigate the differences and changes of blood flow status of splenic volume, common hepatic artery, splenic arteriovenous, inner diameter of portal vein and hepatic in patients with hypersplenism of different degrees using multi-slice spiral CT whole-liver perfusion model.Methods:42 cases with hypersplenism of chronic hepatitis B with cirrhosis and 15 cases without hepatosplenic disease were collected as controls. All patients underwent multi-slice spiral CT whole-liver perfusion imaging. (1) The differences of spleen volume, common hepatic artery, splenic arteriovenous, and portal vein diameter between different degrees of hypersplenism and the control group were measured and compared. (2) The correlation between spleen volume and the inner diameter of each related vessels were analyzed and compared. (3) The values of perfusion parameters related to the five lobes of the liver in Couinaud segments based on hepatic artery perfusion (HAP), portal venous perfusion (PVP), total hepatic perfusion (TLP) and hepatic artery perfusion index (HPI) were measured and compared. One-way ANOVA was used to analyze the measurement data. The correlation between the spleen volume and the inner diameter of each blood vessel was analyzed by Pearson’s correlation analysis.Results:(1) spleen volume and the inner diameter of splenic artery, splenic vein and portal vein in the cirrhotic hypersplenism group were significantly larger than control group, and the difference was statistically significant ( F = 37.108, 17.484, 23.124, 13.636, P < 0.05). (2) spleen volume and the inner diameter of splenic artery, vein and portal vein in the moderate and severe hypersplenism groups were significantly larger than the mild hypersplenism group, and the difference was statistically significant ( F = 25.418, 13.293, 15.136, 7.093, P < 0.05), but there was no statistically significant difference between the moderate and severe hypersplenism groups ( P > 0.05). (3) The inner diameter of splenic vein, portal vein, and splenic artery was positively correlated with spleen volume ( r = 0.680, 0.548, and 0.726). (4) PVP and TLP of the whole liver in hypersplenism group were lower than control group ( P < 0.05), and the differences were statistically significant ( P < 0.05). HPI in the right posterior lobe of the liver in the moderate and severe hypersplenism group was higher than mild hypersplenism group ( F = 3.555, 4.570, P < 0.05), and there was no significant difference in the HAP in the whole liver among the groups ( P > 0.05), but the HAP in the whole liver in the severe hypersplenism group was lower than control, mild and moderate hypersplenism group. Conclusion:The inner diameter of the splenic arteriovenous in patients with hypersplenism of different degrees has widened to varying degrees, and is consistent with the increase in spleen volume, particularly in moderate and severe cases. Portal venous perfusion and total liver perfusion in patients with hypersplenism of different degrees have declined and the hepatic arterial perfusion in patients with severe hypersplenism is significantly reduced.

Mutations or inactivation of parkin, an E3 ubiquitin ligase, are associated with familial form or sporadic Parkinson's disease (PD), respectively, which manifested with the selective vulnerability of neuronal cells in substantia nigra (SN) and striatum (STR) regions. However, the underlying molecular mechanism linking parkin with the etiology of PD remains elusive. Here we report that p62, a critical regulator for protein quality control, inclusion body formation, selective autophagy and diverse signaling pathways, is a new substrate of parkin. P62 levels were increased in the SN and STR regions, but not in other brain regions in parkin knockout mice. Parkin directly interacts with and ubiquitinates p62 at the K13 to promote proteasomal degradation of p62 even in the absence of ATG5. Pathogenic mutations, knockdown of parkin or mutation of p62 at K13 prevented the degradation of p62. We further showed that parkin deficiency mice have pronounced loss of tyrosine hydroxylase positive neurons and have worse performance in motor test when treated with 6-hydroxydopamine hydrochloride in aged mice. These results suggest that, in addition to their critical role in regulating autophagy, p62 are subjected to parkin mediated proteasomal degradation and implicate that the dysregulation of parkin/p62 axis may involve in the selective vulnerability of neuronal cells during the onset of PD pathogenesis.
Adaptor Proteins, Signal Transducing ; chemistry ; metabolism ; Animals ; HEK293 Cells ; Heat-Shock Proteins ; chemistry ; metabolism ; Humans ; Lysine ; metabolism ; Mice ; Neurons ; metabolism ; pathology ; Oxidopamine ; pharmacology ; Parkinson Disease ; metabolism ; pathology ; Proteasome Endopeptidase Complex ; metabolism ; Protein Stability ; Proteolysis ; drug effects ; Sequestosome-1 Protein ; Ubiquitin-Protein Ligases ; metabolism ; Ubiquitination ; drug effects

Objective To detect eight kinds of clinical common pathogenic bacteria by DNA microarray.Methods Eight kinds of common pathogenic bacteria,including Staphylococcus aureus,Pseudomonas aeruginosa,Klebsiella pneumoniae,Escherichia coli,Proteus mirabilis,Enterobacter aerogenes,Pseudomonas fluorescens,Shigella sonnei were collected.Universal primers were designed to amplify 16S rRNA gene fragment from the genomic DNA of the eight bacteria,and probes were designed in the highly variable regions.DNA microarray detection system was established and used for detection of colleted bacteria.A total of 50 samples were collected from the Zhongnan Hospital of Wuhan University,including 6 blood samples,32 sputum samples,9 feces samples and 3 bronchoscope lavage samples.DNA were extracted and detected by the established DNA microarray system.Results The desired fragments were well amplified by the self-designed universal primers.The selected probes had good detection results according to repeated detection.Of the 50 samples detected,pathgenic bacteria were accurately detected in 47 samples.Other three samples were not detected as those bacteria were not included in the chip.By optimizing the detection process,the results could be reported within 8 hours.Observation of probe signal attenuation indicated that even attenuated after 60 days,but the attenuation did not affect the results.Conclusion A microarray system was established for detection of clinical common bacteria accurately and quickly,which provided foundation for its clinical application.

Objective To develop a gene microarray system for detection of clinical common pathogenic fungi.MethodsThere were 8 clinical common fungi chosen as the subjects including Candida albicans,Candida glabrata,Candida tropicalis,Candida parapsilokis,Candida pseudotropicalis,Aspergillus terreus,Aspergillus flavus,Aspergillus oryzae,Aspergillus fumigatus.Universal primers,probes and specific probes for the PCR amplification and microarray preparation were designed in ITS region of the fungi genomic DNA.The PCR products amplified from those fungi's genome DNA were denatured and hybridized with the probes in gene microarray.The rapid detection of fungi was based on the investigation on the fluorescent signal intensity in the chip.The detection results of gene microarray system were verified by true positive and negative clinical samples.Results There were totally 25 positive samples identified by clinical routine microbiological methods.The 10 samples identified as bacteria positive were determined as negative without fluorescent signal by the fungi gene microarray,while the 12 samples identified as fungi positive were determined as positive with certain fungus by the fungi gene microarray.And 3 artificial Candida krusei samples were detected as fungi positive,while they were failure to be identified as certain fungus.There was no fluorescent signal in positions of the 8 fungi specific probes,but there was fluorescent signal in the position of fungi universal probe.It indicated that there were fungi in the samples but it couldn't identify the species of the fungi,because the Candida krusei wasn't included in the detection fungi list of the fungi gene microarray.ConclusionsThe fungi gene microarray established by the study could detect the common fungi in clinic rapidly and accurately.This study lays technology foundation for clinical application of gene chip.

OBJECTIVETo investigate the chemical constituents from the rhizomes of Zingiber officinale.

METHODIsolation and purification of the chemical constituents were carried out on the column chromatography of silica gel and Sephadex LH-20. The structures were elucidated on basis of physicochemical properties and spectral data.

RESULTTen compounds were isolated and identified as beta-sitosterol palmitate (1), isovanillin (2), glycol monopalmitate (3), hexacosanoic acid 2,3-dihydroxypropyl ester (4), maleimide-5-oxime (5), p-hydroxybenzaldehyde (6), adenine (7), 6-gingerol (8), 6-shogaol (9), and 1-(omega-ferulyloxyceratyl) glycerols (10a-10f).

CONCLUSIONCompounds 1-7 and 10a-10e are obtained from Z. officinale for the first time, and compound 10f is a new compound.