Reentrance of interface superconductivity in a high-Tc cuprate heterostructure

Increasing the carrier density in a Mott insulator by chemical doping gives rise to a generic superconducting dome in high temperature superconductors. An intriguing question is whether a second superconducting dome may exist at higher dopings. Here we heavily overdope La2-xSrxCuO4 (0.45 ≤ x ≤ 1.0) and discover an unprecedented reentrance of interface superconductivity in La2-xSrxCuO4 /La2CuO4 heterostructures. As x increases, the superconductivity is weakened and completely fades away at x = 0.8; but it revives at higher doping and fully recovers at x = 1.0. This is shown to be correlated with the suppression of the interfacial charge transfer around x = 0.8 and the weak-to-strong localization crossover in the La2-xSrxCuO4 layer. We further construct a theoretical model to account for the sophisticated relation between charge localization and interfacial charge transfer. Our work advances both the search for and control of new superconducting heterostructures.

The Potential Effect of Microbiota in Predicting The Freshness of Chilled Chicken

1. The goals of this study were to analyse the changes in microbiota composition of chilled chicken during storage and identify microbial biomarkers related to meat freshness.2. The study used 16S rDNA sequencing to track the microbiota shift in chilled chicken during storage. Associations between microbiota composition and storage time were analysed and microbial biomarkers were identified.3. The results showed that microbial diversity of chilled chicken decreased with the storage time. A total of 27 and 24 microbial biomarkers were identified by using orthogonal partial least squares (OPLS) and the random forest regression approach, respectively. The receiver operating characteristic (ROC) curve analysis indicated that the OPLS regression approach had better performance in identifying freshness-related biomarkers. The multiple stepwise regression analysis identified four key microbial biomarkers, including Streptococcus, Carnobacterium, Serratia and Photobacterium genera and constructed a predictive model.4. The study provided microbial biomarkers and a model related to the freshness of chilled chicken. These findings provide a basis for developing detection methods of the freshness of chilled chicken.

[The pH-Sensitive Potassium Channel TASK-1 Is a Chemosensor for Central Respiratory Regulation in Rats]

TWIK-related acid-sensitive potassium channel-1 (TASK-1) is a "leak" potassium channel sensitive to extracellular protons. It contributes to setting the resting potential in mammalian neurons. TASK-1 channels are widely expressed in respiratory-related neurons in the central nervous system. Inhibition of TASK-1 by extracellular acidosis can depolarize and increase the excitability of these cells. Here we describe the distribution of TASK-1 in the rat brainstem and show that TASK-1 mRNAs are present in respiratory-related nuclei in the ventrolateral medulla, which have been proposed as neural substrates for central chemo-reception in rats. After inhalation of 8% CO2 for 30 and 60 min, TASK-1 mRNA levels in positive-expression neurons were remarkably upregulated. Injection of the TASK-1 blocker anandamide (AEA) into the rat lateral cerebral ventricle, showed a significant excitement of respiratory at 10 min posttreatment, with a marked decrease in inspiratory and expiratory durations and an increased frequency of respiration. We suggest that TASK-1 channel may serve as a chemosensor for in central respiration and may contribute to pH-sensitive respiratory effects. TASK-1 channel might be an attractive candidate for sensing H^(+)/CO2 in several respiratory-related nuclei in the brainstem. It is likely that TASK-1 participates in pH-sensitive chemical regulation in the respiratory center under physiological and pathological conditions.

[Clinical analysis of 92 cases of unilateral sinonasal diseases]

Objective:To investigate the etiology of unilateral sinonasal disease and clinical features. Method:The clinic data of 92 patients with unilateral sinonasal diseases were analyzed. Result:42 cases of chronic sinusitis (31 cases of nasal polyps), 17 cases of nasal inverted papilloma, 9 cases of sinus fungal disease, 6 cases of odontogenic maxillary sinusitis, 3 cases of maxillary choanal polyp, 4 cases of nasal blood vessels tumor, 3 cases of sinus osteoma, 6 cases of sinus cyst, 2 cases of sinonasal malignancies. Conclusion:Among unilateral sinonasal diseases, chronic sinusitis, nasal polyps are very common, but there are still more than half of the other pathological changes, the most common one is the nasal inverted papilloma. Therefore, more attention should be paid to the preoperative differential diagnosis.

[Screening different HPV genotypes infection and type-specific in cervical exfoliated cells of women in Yili area of Xinjiang Uygur Autonomous Region, China]

Objective: To investigate the infection status and genotype distribution of cervical human papillomavirus (HPV) in women of different ethnic groups and different ages in Yili, Xinjiang Uygur Autonomous Region (Xinjiang). Methods: By using the convenient sampling method, 54 760 women from November 2015 to May 2017 seeking for service in gynecological clinics in a general hospital in Yili, Xinjiang, were selected as the research subjects, and 3 445 samples of cervical mucous exfoliative cells were collected, and the social information of their ethnic and age was collected at the same time. The inclusion criteria were those with sexual life, cervical integrity, and ethnic groups for Han or Uygur or Kazak. PCR-reverse dot blot hybridization was used to detect HPV genotyping in exfoliated cells, and chi-square test was used to compare the difference of HPV positive rate among different ethnic groups. Then, according to ethnicity and age, the differences in positive rates of different ages and ethnic groups were compared in each layer. Results: The positive rate of HPV was 25.6% (882 cases), of which the Han, Uygur and Kazakh were 27.9% (564 cases), 22.9% (196 cases) and 21.6% (122 cases), and the difference was statistically significant (χ(2)=13.80, P=0.001). The most prevalent high-risk genotypes of Han women were HPV16/52/58, accounting for 24.8% (140 cases), 17.7% (100 cases) and 9.8% (55 cases), respectively. The most prevalent high-risk genotypes of Uygur women were HPV16/52/53, accounting for 34.2% (67 cases), 12.8% (25 cases), 9.2% (18 cases), respectively. The most prevalent high-risk genotypes of Kazak were HPV16/52/53, accounting for 37.7% (46 cases), 17.2% (21 cases), 12.3% (15 cases), respectively. The highest rate of HPV in Uygur patients aged ≥61 years was 41.5% (22 cases), and the lowest in group 36-40 years old, 15.9% (21 cases), the difference between different age groups was statistically significant (χ(2)=35.01, P<0.001). Conclusion: The positive rate of HPV infection among Han, Uygur and Kazak in Yili Prefecture of Xinjiang was different, and the HPV positive genotype differs among different ethnic groups.

[Clinical validation of multiple biomarkers suspension array technology for ovarian cancer]

Objective: To investigates the diagnostic value of combined detection serum CCL18, CXCL1 antigen, C1D, TM4SF1, FXR1, TIZ IgG autoantibody by suspension array for ovarian cancer. Methods: Suspension array was used to detect CCL18, CXCL1 antigen, C1D, TM4SF1, FXR1, TIZ IgG autoantibody in 120 cases of healthy women, 204 cases of patients with benign pelvic tumors, 119 cases of pelvic malignant tumor patients, and 40 cases with breast cancer, lung cancer oroliver cancer, respectively. Constructed diagnosis model of combined detection six biomarkers for diagnosis of ovarian malignant tumor. Constructed diagnosis model of combined detection autoantibodies to diagnose epithelial ovarian cancer. Analysed the value of detecting six biomarkers for diagnosis of ovarian malignant tumor and detecting autoantibodies for diagnosis of epithelial ovarian cancer. Analysed diagnostic value of detecting six biomarkers to diagnose stage Ⅰ and Ⅱepithelial ovarian cancer. Compared diagnostic value of detecting six biomarkers in diagnosis of tissue types and pathologic grading with that of CA(125). Results: Model of combined detecting six biomarkers to diagnose ovarian malignant tumor was logit (P) =-11.151+0.008×C1D+0.011×TM4SF1+0.011×TIZ-0.008×FXR1+0.021×CCL18+0.200×CXCL1. Model of combined detection autoantibodies to diagnose epithelial ovarian cancer was logit (P) =-5.137+0.013×C1D+0.014×TM4SF1+0.060×TIZ-0.060×FXR1. Sensitivity and specificity of detecting six biomarker to diagnose ovarian malignant tumor was 90.6% and 98.7%. Sensitivity and specificity of detecting autoantibodies to diagnose epithelial ovarian cancer was 75.8% and 96.7%. Combined detection for six biomarkers to diagnose serous and mucinous ovarian cancer was statistically no better than those of CA(125) (P=0.196 and P=0.602, respectively); there was significantly difference in diagnosis of ovarian cancer (P=0.023), and there was no significantly difference in diagnosis of different pathological grading (P=0.089 and P=0.169, respectively). Conclusions: Constructing diagnosis model of combined detection six biomarker to diagnose ovarian malignant tumor and constructed diagnosis model of combined detectionautoantibodies to diagnose epithelial ovarian cancer. Combined detection six biomarkers to diagnose serous and mucinous ovarian tumors is better than that of CA(125).

[Establishment and verification of detecting multiple biomarkers for ovarian cancer by suspension array technology]

Objective: Establish and validation of combined detecting of CCL18, CXCL1, C1D, TM4SF1, FXR1, TIZ suspension array technology. Methods: (1)CCL18, CXCL1 monoclonal antibody and C1D, TM4SF1, FXR1, TIZ protein were coupled with polyethylene microspheres. Biotinylated CCL18, CXCL1 polyclonal antibody and sheep anti-human IgG polyclonal antibody were prepared simultaneously. The best packaged concentrations of CCL18, CXCL1 monoclonal antibody and C1D, TM4SF1, FXR1, TIZ antigens were optimized. The best packaged concentrations of CCL18, CXCL1 polyclonal antibodys and C1D, TM4SF1, FXR1, TIZ sheep anti-human IgG polyclonal antibody were optimized to establish a stable detected suspension array.(2)Sixty patients confirmed by pathological examination with ovarian cancer(ovarian cancer group)which treated in Affiliated Tumor Hospital of Guangxi Medical University, 30 patients with ovarian benign tumor(benign group)and 30 cases of healthy women(control group)were chosen between September 2003 and December 2003. Suspension array technology and ELISA method were used to detect expression of CCL18, CXCL1 antigen and C1D, TM4SF1, FXR1 and TIZ IgG autoantibody contented in 3 groups of serum, then to compare the diagnostic efficiency and diagnostic accuracy of two methods(coefficient of variation between batch and batch). Results: (1)This research successfully established stable detecting system of CCL18, CXCL1, C1D, TM4SF1, FXR1 and TIZ IgG autoantibody. The best concentration of CCL18, CXCL1 monoclonal antibody and C1D, TM4SF1, FXR1, TIZ antigen package were 8, 8, 12, 8, 4 and 8 μg/ml; the best detection of CCL18, CXCL1 biotin polyclonal antibody and C1D, TM4SF1, FXR1, TIZ sheep anti-huamne IgG polyclonal antibody were respectively 4, 2, 2, 4, 4 and 2 μg/ml.(2)Suspension array technology and ELISA method were used to detect CCL18, CXCL1 antigen and C1D, TM4SF1, FXR1, TIZ IgG autoantibody of three groups in serum were similar(P>0.05).(3)The comparison of two methods in the diagnosis of efficiency: the diagnostic accuracy of two methods were 99.2%(119/120)and 94.2%(113/120), the difference was statistically significant(P=0.031). The sensitivity of the diagnosis of ovarian cancer of two methods were 100.0%(60/60)and 93.3%(56/60), specific degrees were 100.0%(59/59)and 93.4%(57/61), positive predictive value was 100.0%(60/60)and 93.3%(56/60), negative predictive value was 98.3%(59/60)and 95.0%(57/60), the difference was statistically significant(P<0.05).(4)The detected results of CCL18, CXCL1 antigen and C1D, TM4SF1, FXR1, TIZ IgG autoantibody shown that the diagnostic accuracy of suspension array technology was superior to those of ELISA method(all P<0.05). Conclusion: The study has established the stable detection of suspension array technology, and the diagnostic efficiency and diagnostic accuracy was much better than that by ELISA.

Relationship of the APOA5/A4/C3/A1 gene cluster and APOB gene polymorphisms with dyslipidemia

We determined the alleles of ten single nucleotide poly-morphisms (SNPs) in the APOA5/A4/C3/A1 gene cluster and in APOB in Han Chinese from Xinjiang Shihezi, China using MALDI-TOF mass spectrometry, and explored the correlation between these SNPs and dyslipidemia through a case-control study design with 250 pa-tients and 250 normal controls. All SNPs except for APOA5 rs2072560 conformed to Hardy-Weinberg equilibrium (all P > 0.05). APOA5 rs651821, APOA4 rs5104, APOC3 rs734104, and APOC3 rs5128 geno-type and allele frequencies were significantly different between groups (all P < 0.01). For rs651821, the risks of dyslipidemia for the CC or CC+CT genotypes were 9.917 or 1.859 times that of TT, and the risk of the C vs T allele was 2.027. For rs5104, the AG, GG, or AG+GG risks were 1.797, 1.861, and 1.809 times AA, and the G vs A risk was 1.427. For rs734104, the CT, CC, or CC+CT risks were 1.851, 2.570, and 1.958 times TT, and the C vs T risk was 1.610. For rs5128, the GC or CC+GC risks were 1.738 or 1.749 times GG, and the C vs G risk was 1.477. Compared with the wild-type haplotype TATG, the risks of dyslipidemia with CGCC, TGCC, or CATG haplotypes (odds ratios = 2.434, 1.503, and 2.740, respectively) were significantly higher. Our results suggested that these four SNPs were significantly associated with dyslipidemia in Xinjiang Shihezi Han Chinese, and might serve as risk factors for dyslipidemia. Individuals carrying the CGCC, TGCC, or CATG haplotypes were prone to dyslipidemia.

Usefulness of low-dose CT in the detection of pulmonary metastasis of gestational trophoblastic tumours

AIM

To determine whether a low-dose spiral chest computed tomography (CT) examination could replace standard-dose chest CT in detecting pulmonary metastases in patients with gestational trophoblastic tumour (GTT).

MATERIALS AND METHODS

In a prospective investigation, 67 chest CT examinations of 39 GTT patients were undertaken. All the patients underwent CT examinations using standard-dose (150 mAs, pitch 1, standard reconstruction algorithm) and low-dose (40 mAs, pitch 2, bone reconstruction algorithm) protocols. Two radiologists interpreted images independently. A metastasis was defined as a nodule within lung parenchyma that could not be attributed to a pulmonary vessel. The number of metastases detected with each protocol was recorded. The size of each lesion was measured and categorized as <5, 5-9.9, and > or = 10 mm. Wilcoxon's signed rank test was used to assess the difference between the numbers of lesion detected by the two protocols.

RESULTS

The CT dose index (CTDI) for the standard-dose and low-dose CT protocols was 10.4 mGy and 1.4 mGy, respectively. One thousand, six hundred, and eighty-two metastases were detected by standard-dose CT, and 1460 lesions by the low-dose protocol. The numbers detected by low-dose CT were significantly less than those detected by standard-dose CT (Z=-3.776, p<0.001), especially for nodules smaller than 5mm (Z=-4.167, p<0.001). However, the disease staging and risk score of the patients were not affected by use of the low-dose protocol.

CONCLUSION

Low-dose chest CT can be used as a staging and follow-up procedure for patients with GTT.

[Reconstruction of hypopharyngeal cavity with neck reverse rectangular thinned skin flap]

OBJECTIVE

To study the postoperative convalescence of swallow after reconstruction of hypopharyngeal defect with the neck reverse rectangular thinned skin flap.

METHOD

A thinned reverse skin flap was designed in the middle line of a platysma skin flap, and was used in hypopharyngeal reconstruction for 20 patients with squamous cell carcinoma of the hypopharynx.

RESULT

No skin flap complications occurred in all patients. Fistulas in 5 cases healed spontaneously in 7 days to 10 days without further surgery. One case with lower anastomotic site stenosis was performed by subsequent successful surgery. The survival rate was 50% and 33.3% respectively after 3 years and 5 years follow up.

CONCLUSION

This flap was effectively applied for reconstruction of hypopharyngeal defect for hypopharyngeal cancer, which was easy to master by surgeons, and was a high successful procedure of choice.

[Clinical study on treatment of early glottic carcinoma with different cordectomy]

OBJECTIVE

To explore the advantage of KTP laser cordectomy in the treatment of early glottic carcinoma.

METHOD

Follow-up observation on 30 patients who had KTP laser cordectomy and 18 patients who had laryneal split cordectomy was applied, then their postoperative laryngeal structure's change, the quality of voice and the quality of life (QOL) were compared and analyzed.

RESULT

The patient group treated by KTP laser grew out a piece of new cord just at the place where it was excised after half a year, and the quality of voice was obviously improved near to norm, and they had higher QOL. On the contrary, the other group had no newly grown cord, their quality of voice was better in the first half year but was worse last out. Their QOL was lower than the laser group before decannulation and the same as the laser group after the decannulation. There are 2 cases recurrented in the laser group and 1 case recurrented in the laryneal split group, the two groups all had no metastasis and death in laryneal carcinoma by 2-4 years follow up postoperation.

CONCLUSION

On the basis of effecting radical cure, the early glottic carcinoma treated with non-contact KTP laser with suspension laryngoscope can result in good recuperating in laryngeal structure, less injury and high QOL. So it makes micro-injury treatment in laryngeal carcinoma come true and better than the laryngeal split cordectomy.

Human papillomavirus DNA sequences and p53 over-expression in laryngeal squamous cell carcinomas in Northeast China

One-hundred-two patients with laryngeal squamous cell carcinomas in Northeast China were examined for human papillomavirus (HPV) DNA by the polymerase chain reaction (PCR) coupled with Southern blot hybridization, and for p53 over-expression by immunohistochemical staining. HPV DNAs were found in 60 cases (58.8%). HPV-16, -18, -6, -11, and -33 DNAs were detected in 30 cases, 22 cases, 25 cases, two cases, and one case, respectively. In addition, coinfection either with HPV-6 and -16 or with HPV-6 and -18 was detected in 20 cases (33.3% of HPV DNA-positive cases). p53 over-expression was observed in 60 patients (58.8%). p53 was over-expressed significantly in the poorly-differentiated SCC and in patients with metastasis to lymph nodes (P < 0.05, respectively). Both HPV DNA and p53-expression were positive in 35 patients, and negative in 17 patients. Either HPV DNA or p53-expression were positive in 50 patients (25 cases each). Although p53 was detected in 35 (58.3%) of HPV-positive patients, there was no significant correlation between HPV infection and p53 over-expression in laryngeal squamous cell carcinomas of Northeast China.

Identification of human N-ras as the common oncogene in NIH 3T3 cells transformed with DNAs from human primary hepatic cancer and hepatoma 7402 line

DNA was extracted from NIH 3T3 cells transformed with DNAs from human primary hepatic cancer (PHC) and Hepatoma 7402 cell line. The transformant DNA was analyzed by Southern transfer and hybridization with 32P-labeled probes of various oncogenes. The EcoRI 7.2 and 9.0 kb bands characteristic of human N-ras gene were identified in transformed NIH 3T3 cells derived both from PHC and 7402 DNA. The BamHI 6.6 kb band characteristic of human c-Ha-ras I was present only in 7402 transformants, but not in PHC transformants. Using 35S-methionine incorporation, immunoprecipitation with anti-p21 monoclonal antibodies, SDS-PAGE and autoradiography, it was demonstrated that p21 synthesis was remarkably enhanced in 7402 cells as well as in transformed cells derived from both 7402 and PHC DNA. Taking the data together, it strongly implies that N-ras is one of the transforming genes for human liver cancer.