Electroencephalography microstate alterations reflect potential double-edged cognitive adaptation in Ménière's disease.

PURPOSE: To explore the microstate characteristics and underlying brain network activity of Ménière's disease (MD) patients based on high-density electroencephalography (EEG), elucidate the association between microstate dynamics and clinical manifestation, and explore the potential of EEG microstate features as future neurobiomarkers for MD. METHODS: Thirty-two patients diagnosed with MD and 29 healthy controls (HC) matched for demographic characteristics were included in the study. Dysfunction and subjective symptom severity were assessed by neuropsychological questionnaires, pure tone audiometry, and vestibular function tests. Resting-state EEG recordings were obtained using a 256-channel EEG system, and the electric field topographies were clustered into four dominant microstate classes (A, B, C, and D). The dynamic parameters of each microstate were analyzed and utilized as input for a support vector machine (SVM) classifier to identify significant microstate signatures associated with MD. The clinical significance was further explored through Spearman correlation analysis. RESULTS: MD patients exhibited an increased presence of microstate class C and a decreased frequency of transitions between microstate class A and B, as well as between class A and D. The transitions from microstate class A to C were also elevated. Further analysis revealed a positive correlation between equilibrium scores and the transitions from microstate class A to C under somatosensory challenging conditions. Conversely, transitions between class A and B were negatively correlated with vertigo symptoms. No significant correlations were detected between these characteristics and auditory test results or emotional scores. Utilizing the microstate features identified via sequential backward selection, the linear SVM classifier achieved a sensitivity of 86.21% and a specificity of 90.61% in distinguishing MD patients from HC. CONCLUSIONS: We identified several EEG microstate characteristics in MD patients that facilitate postural control yet exacerbate subjective symptoms, and effectively discriminate MD from HC. The microstate features may offer a new approach for optimizing cognitive compensation strategies and exploring potential neurobiological markers in MD.

Cone-beam CT evaluation of post-extraction alveolar bone changes at the maxillary incisor sites in an East Asian population: A cross-sectional study.

Objective: Understanding the characteristics of alveolar bone resorption in an East Asian population after maxillary incisor extraction and providing a reference for implant treatment plans. Study design: Cone-beam computerized tomography (CBCT) data of 125 East Asian patients with unilateral extraction of maxillary incisors for 3 months were collected. The alveolar bone width and height in the extraction sites were measured and compared with the corresponding contralateral sites. Results: The differences in alveolar bone width between the extraction site and contralateral site were as follows: 4.11 mm, 2.68 mm, and 2.09 mm (3 mm, 5 mm, 7 mm apical from CEJ of the contralateral tooth). Data are expressed as the median. The horizontal resorption ratio of alveolar bone was 49.94 %, 31.5 %, and 24.46 %. The difference in alveolar bone height was 0.78 mm. The vertical resorption ratio was 7.78 %. The resorption did not differ significantly between sexes and was not significantly affected by tooth positions. Conclusions: In the studied East Asian population, significant horizontal and vertical alveolar bone resorption occurs after natural healing of maxillary incisor extraction for 3 months. The closer to the alveolar ridge crest, the more significant the horizontal resorption, resulting in an "inverted triangle" shape residual alveolar bone.

LncRNA SNHG5 promotes the glycolysis and proliferation of breast cancer cell through regulating BACH1 via targeting miR-299.

BACKGROUND: Breast cancer (BC) is one of the most common malignant tumors in women. Accumulating studies have been reported that long non-coding RNA (lncRNA) SNHG5 is highly expressed in BC. However, the specific molecular mechanism of SNHG5 in BC is unclear. METHODS: Gene and protein expressions in BC cell were detected by qRT-PCR and western blotting. The proliferation and cell cycle were measured using colony formation assay and flow cytometry analysis, separately. The glucose consumption and lactate production were determined by using the glucose assay kit and lactate assay kit. A dual-luciferase reporter assay was performed to measure the interaction between miR-299 and SNHG5 or BACH1. RESULTS: SNHG5 and BACH1 expressions were increased in BC cell while miR-299 level was decreased. SNHG5 increased BACH1 expression by directly targeting miR-299. SNHG5 silencing or miR-299 overexpression suppressed the proliferation of BC cell, arrested the cell cycle in the G1 cell phase, and decreased the glucose consumption and lactate production of BC cell. However, inhibition of miR-299 or overexpression of BACH1 could reverse the inhibitory effects of sh-SNHG5 on cell proliferation and glycolysis in BC. CONCLUSION: SNHG5 promoted the BC cell growth and glycolysis through up-regulating BACH1 expression via targeting miR-299. These findings may improve the diagnostic and therapeutic approaches to BC.

Large Scale Synthesis of Three-dimensional Hierarchical Porous Framework with High Conductivity and its Application in Lithium Sulfur Battery.

Quick capacity loss due to the polysulfide shuttle effects and poor rate performance caused by low conductivity of sulfur have always been obstacles to the commercial application of lithium sulfur batteries. Herein, an in-situ doped hierarchical porous biochar materials with high electron-ion conductivity and adjustable three-dimensional (3D) macro-meso-micropore is prepared successfully. Due to its unique physical structure, the resulting material has a specific surface area of 2124.9 m2 g-1 and a cumulative pore volume of 1.19 cm3 g-1 . The presence of micropores can effectively physically adsorb polysulfides and mesopores ensure the accessibility of lithium ions and active sites and give the porous carbon material a high specific surface area. The large pores provide channels for the storage of electrolyte and the transmission of ions on the surface of the substrate. The combined effect of these three kinds of pores and the N doping formed in-situ can effectively promote the cycle and rate performance of the battery. Therefore, prepared cathode can still reach a reversible discharge capacity of 616 mAh g-1 at a rate of 5 C. After 400 charge-discharge cycles at 1 C, the reversible capacity is maintained at 510.0 mAh g-1 . This new strategy has provided a new approach to the research and industrial-scale production of adjustable hierarchical porous biochar materials.

[Impact of sperm DNA fragmentation on the outcome of frozen-thawed blastocyst transfer in in vitro fertilization and embryo transfer].

OBJECTIVE: To study the impact of sperm DNA fragmentation (DF) on the outcome of frozen-thawed blastocyst transfer in in vitro fertilization and embryo transfer (IVF-ET). METHODS: We retrospectively analyzed 308 cases of routine IVF-ET performed at our Center of Reproductive Medicine from January 2016 to January 2018. According to the sperm DNA fragmentation index (DFI), we divided the patients into a normal DFI (DFI ≤ 15%, n = 114), a moderate DFI (15% < DFI ≤ 30%, n = 103), and a high DFI group (DFI > 30 %, n = 91), and compared the development of embryos and clinical outcomes among the three groups. RESULTS: The blastocyst formation rate was remarkably higher in the normal and moderate DFI groups than in the high DFI group (68.9% and 66.2% vs 58.3%, P < 0.05) but the percentage of available blastocysts exhibited no statistically significant difference between the former two and the latter group (88.1% and 84.0% vs 81.2%, P > 0.05). There were statistically significant differences among the normal, moderate and high DFI groups in the percentage of high-quality blastocysts (80.3% vs 68.8% vs 59.7%, P < 0.05). The implantation rate was dramatically lower in the high DFI group than in the normal and moderate DFI groups (30.4% vs 43.1% and 41.0%, P < 0.05), and so was the clinical pregnancy rate (33.6% vs 43.2% and 40.2%, P < 0.05), but the abortion rate markedly higher in the former than in the latter two groups (16.2% vs 10.0% and 9.8%, P < 0.05). CONCLUSIONS: High sperm DFI can not only significantly reduce the rates of blastocyst formation, available blastocysts and high-quality blastocysts, but also decrease the rates of implantation and clinical pregnancy and increase that of abortion after frozen-thawed blastocyst transfer.

Removal of biofilm is essential for long-term ventilation tube retention.

BACKGROUND: Although long-term retention of a ventilation tube is required in many ear diseases, spontaneous removal of conventional ventilation tube is observed in patients within 3 to 12 mo. To address this issue, we aimed to determine a new method for long-term retention of the ventilation tube. AIM: To explore the value of removing the biofilm for long-term retention of tympanostomy ventilation tubes. METHODS: A case-control study design was used to evaluate the safety and effectiveness of long-term tube retention by directly removing the biofilm (via surgical exfoliation) in patients who underwent myringotomy with ventilation tube placement. The patients were randomly divided into two groups: Control group and treatment group. Patients in the treatment group underwent regular biofilm exfoliation surgery in the clinic, whereas those in the control group did not have their biofilm removed. Only conventional ventilation tubes were placed in this study. Outcome measures were tube position and patency. Tube retention time and any complications were documented. RESULTS: Eight patients with biofilm removal and eight patients without biofilm removal as a control group were enrolled in the study. The tympanostomy tube retention time was significantly longer in the treatment group (43.5 ± 26.4 mo) than in the control group (9.5 ± 6.9 mo) (P = 0.003). More tympanostomy tubes were found to be patent and in correct position in the treatment group during the follow-up intervals than in the control group (P = 0.01). CONCLUSION: Despite the use of short-term ventilation tubes, direct biofilm removal can be a well-tolerated and effective treatment for long-term tube retention of tympanostomy ventilation tubes in patients who underwent myringotomy.

Changes in tinnitus after vestibular schwannoma surgery.

We designed a prospective study to evaluate changes in tinnitus after vestibular schwannoma (VS) surgery. Subjects included 41 patients who were diagnosed with a VS and underwent translabyrinthine microsurgery (TLM) between January 2015 and May 2016. All patients underwent related examinations and were asked to answer the Tinnitus Handicap Inventory (THI) scale and a visual analog scale (VAS) of tinnitus severity both pre- and postoperatively. Of the 41 patients, 31 (75.6%) suffered from tinnitus before surgery. Microsurgery was associated with an overall decrease in tinnitus (p < 0.001). There was a significant improvement in THI and VAS scores after surgery (p = 0.001 and p = 0.005, respectively). The decrease in THI scores in the low-frequency group was significantly larger than that of the mid- and high-frequency groups after surgery (p = 0.034 and p = 0.001, respectively). The loudness of tinnitus decreased significantly after surgery (p = 0.031). Tinnitus in patients with VS improved after TLM. Patients with mid-/high-frequency tinnitus and louder tinnitus preoperatively seemed to have a worse prognosis than those with low-frequency and quieter tinnitus.

Enhancing Production of Pinene in Escherichia coli by Using a Combination of Tolerance, Evolution, and Modular Co-culture Engineering.

α-Pinene is a natural and active monoterpene, which is widely used as a flavoring agent and in fragrances, pharmaceuticals, and biofuels. Although it has been successfully produced by genetically engineered microorganisms, the production level of pinene is much lower than that of hemiterpene (isoprene) and sesquiterpenes (farnesene) to date. We first improved pinene tolerance to 2.0% and pinene production by adaptive laboratory evolution after atmospheric and room temperature plasma (ARTP) mutagenesis and overexpression of the efflux pump to obtain the pinene tolerant strain Escherichia coli YZFP, which is resistant to fosmidomycin. Through error-prone PCR and DNA shuffling, we isolated an Abies grandis geranyl pyrophosphate synthase variant that outperformed the wild-type enzyme. To balance the expression of multiple genes, a tunable intergenic region (TIGR) was inserted between A. grandis GPPSD90G/L175P and Pinus taeda Pt1Q457L . In an effort to improve the production, an E. coli-E. coli modular co-culture system was engineered to modularize the heterologous mevalonate (MEV) pathway and the TIGR-mediated gene cluster of A. grandis GPPSD90G/L175P and P. taeda Pt1Q457L . Specifically, the MEV pathway and the TIGR-mediated gene cluster were integrated into the chromosome of the pinene tolerance strain E. coli YZFP and then evolved to a higher gene copy number by chemically induced chromosomal evolution, respectively. The best E. coli-E. coli co-culture system of fermentation was found to improve pinene production by 1.9-fold compared to the mono-culture approach. The E. coli-E. coli modular co-culture system of whole-cell biocatalysis further improved pinene production to 166.5 mg/L.

Inhibition of the JAK2/STAT3/SOSC1 Signaling Pathway Improves Secretion Function of Vascular Endothelial Cells in a Rat Model of Pregnancy-Induced Hypertension.

BACKGROUND/AIMS: The present study aimed to investigate the effects of the JAK2/STAT3/SOSC1 signaling pathway on the secretion function of vascular endothelial cells (VECs) in a rat model of pregnancy-induced hypertension (PIH). METHODS: A PIH rat model was established. Forty-eight pregnant Sprague-Dawley female rats were selected and assigned into four groups: the normal group (normal non-pregnant rats), the non-PIH group (pregnant rats without PIH), the PIH group (pregnant rats with PIH) and the AG490 group (pregnant rats with PIH treated with AG490). Systolic blood pressure (SBP) and urinary protein (UP) were measured. The expressions of JAK2/STAT3/SOSC1 signaling pathway-related proteins in placenta tissues were detect by Western blotting. Radioimmunoassay was applied to detect serum levels of nitric oxide (NO), super oxide dismutase (SOD), placental growth factor (PGF), thromboxane B2 (TXB2) and endothelin (ET). Enzyme-linked immunosorbent assay (ELISA) was used to determine serum levels of interleukin-6 (IL-6), interleukin-10 (IL-10) and tumor necrosis factor-α (TNF-α). RESULTS: Compared with the normal and non-PIH groups, the PIH and AG490 groups had higher SBP and UP levels at 17th and 25th day of pregnancy. The expressions of p/t-JAK2, p/t-STAT3 and SOSC1 in the PIH and AG490 groups were higher than those in the non-PIH group, while the expressions of p/t-JAK2, p/t-STAT3 and SOSC1 in the AG490 group were lower than those in the PIH group. Compared with the non-PIH group, serum levels of ET, TXB2, IL-6 and TNF-α were increased in the PIH and AG490 groups, while serum levels of NO, SOD, 6-keto-PGF1a and IL-10 levels were reduced. Furthermore, the AG490 had lower serum levels of ET, TXB2, IL-6 and TNF-α and higher serum levels of NO, SOD, 6-keto-PGF1a and IL-10 than those in the PIH group. CONCLUSION: Our study provides evidence that inhibition of the JAK2/STAT3/SOSC1 signaling pathway could improve the secretion function of VECs in PIH rats.

Open-Framework Oxysulfide Based on the Supertetrahedral [In4Sn16O10S34](12-) Cluster and Efficient Sequestration of Heavy Metals.

The new ion-exchange oxy-sulfide material has a three-dimensional open framework comprising the pseudo-T4 supertetrahedral [In4Sn16O10S34](12-) cluster. This material has large pores and is a fast ion exchanger. It exhibits high selectivity in sequestering heavy metal ions from aqueous solutions including solutions containing heavy concentrations of sodium, calcium, ammonium, magnesium, zinc, carbonate, phosphate, and acetate ions. Moreover, the ion-exchange efficiency in competitive ion-exchange experiments involving mixtures of metal ions is significantly higher than for solutions of single metal ions.

Lack of association between hsa-miR-149 rs2292832 polymorphism and cancer risk: a meta-analysis of 12 studies.

BACKGROUND: MicroRNAs (miRNAs) participate in various cellular processes such as cell growth, differentiation, cell death and play an important role in a variety of diseases, especially in cancer. Recently, a number of studies have investigated the association between single nucleotide polymorphisms (SNPs) on the hsa-miR-149 rs2292832 and susceptibility to cancer; however, the results remain inconclusive. METHODOLOGY/PRINCIPAL FINDINGS: We carried out a meta-analysis of 12 studies including 5937 cases and 6081 controls from PubMed to assess the association between the hsa-miR-149 rs2292832 and cancer risk by pooled odds ratios (ORs) and 95% confidence intervals (CIs). However, our results showed that genotype distribution of the hsa-miR-149 rs2292832 was not associated with cancer risk in all genetic models. Subgroup analysis by cancer type, ethnicity or study design showed no significant association either. CONCLUSION: Results of this meta-analysis suggest that the hsa-miR-149 rs2292832 polymorphism is not associated with cancer risk in spite of the potentially protective role of C allele in hepatocellular carcinoma and male gastric cancer.

The role of cyclin D1 expression and patient's survival in non-small-cell lung cancer: a systematic review with meta-analysis.

BACKGROUND: The role of cell-cycle protein cyclin D1 in lung cancer remains controversial. To clarify its impact on survival in non-small-cell lung cancer (NSCLC), we performed a meta-analysis on the currently available medial literature to quantitatively assess its role on survival of NSCLC according to cyclin D1 status. METHOD: Published studies that investigated the association between cyclin D1 expression and NSCLC survival were identified. Meta-analysis was performed by using a DerSimonian-Laird model. Funnel plot was used to investigate publication bias and sources of heterogeneity were identified by using meta-regression analysis. RESULT: A total of 24 studies with 2731 patients were evaluable for this meta-analysis. No statistical significance was found that cyclin D1 expression was associated with poor prognosis in NSCLC (hazard ratio 1.08 [95% CI, 0.80-1.45]) without publication bias found. But there was significant heterogeneity present; meta-regression analysis was used to explore the sources of heterogeneity and revealed that the outcome of analysis was influenced by cutoff values and ethnicity. No difference between positive and negative studies on study quality assessment was present. CONCLUSION: The cyclin D1 expression is unlikely to be useful as a prognostic marker for NSCLC in clinical practice from current evidence. The conclusion should be confirmed by a large well-designed prospective study.

[Impact of elevated basal follicle-stimulating hormone on the quantity and quality of oocytes and embryos and pregnancy outcomes in young women].

OBJECTIVE: To evaluate the effect of elevated basal follicle-stimulating hormone (FSH) on both the quantity and quality of oocytes and embryos and the clinical outcomes of pregnancy in women under 35 years of age. METHODS: A retrospective analysis was conducted for inspecting 294 in vitro fertilization-embryo transfer (IVF-ET) cycles in women under 35 years of age. According to the basal FSH levels, the women were divided into groups A, B, and C with basal FSH of 10-14.99, 15-19.99 and ≥20 IU/L, respectively, to compare the average number of oocytes retrieved, morphologies of the oocytes and embryos, and clinical outcomes of pregnancy. RESULTS: Group A showed greater average numbers of oocytes collected, total embryos and good-quality embryos with a lower gonadotrophin dose required to achieve follicular maturity than groups B and C. The 3 groups showed no significant differences in the percentage of metaphase II oocytes, optimal embryos-blastomere number, normal fertilization rate, cleavage rate, good-quality embryo rate, implantation rate, pregnancy rates, live birth rate or miscarriage rate, but the pregnancy rates and live birth rate tended to decrease in women with basal FSH ≥15 U/L. CONCLUSION: In women below 35 years of age, an elevated serum FSH (especially one ≥15 U/L) indicates diminished ovarian reserve and reduced numbers of oocyte and embryo but not poor oocyte or embryos quality, and good clinical pregnancy rate can still be expected.

Assisted reproductive technologies do not increase risk of abnormal methylation of PEG1/MEST in human early pregnancy loss.

OBJECTIVE: To evaluate the epigenetic risk linked to assisted reproductive technology (ART) by analyzing the methylation patterns of imprinted PEG1 gene in aborted human chorionic villus. DESIGN: Experimental research study. SETTING: Research laboratory. PATIENT(S): Four patients groups were tested: spontaneous abortion after ART (n = 44), multifetal reduction after ART (n = 22), spontaneous abortion of natural pregnancies (n = 45), and induced abortion of natural pregnancies (n = 47). INTERVENTION(S): Methylation patterns of PEG1 in the aborted chorionic villus were determined. MAIN OUTCOME MEASURE(S): The DNA methylation patterns were analyzed using pyrosequencing and bisulfite sequencing polymerase chain reaction. The percentage of methylation was compared in chorionic villus from the four experimental groups. RESULT(S): Regardless of conception method, the PEG1 methylation percentage in chorionic villus from spontaneous abortions was significantly higher than in villus from induced abortions and multifetal reduction. In the spontaneous abortions groups, the percent methylation of PEG1 was similar in the villus derived from ART and from natural pregnancies. The two fertilization methods (IVF and intracytoplasmic sperm injection) did not show significant differences either. However, receiver operating characteristic curve analysis revealed a significant positive correlation between PEG1 methylation percentage and rate of early spontaneous abortions. CONCLUSION(S): As some studies have suggested, imprinting errors of PEG1 may contribute to spontaneous abortion, but ART procedures might not increase the occurrence of aberrant PEG1 methylation patterns.

[Prediction of ovarian reserve, poor response and pregnancy outcome based on basal antral follicle count and age in patients undergoing in vitro fertilization-embryo transfer].

OBJECTIVE: To study the value of basal antral follicle count (AFC) and age in predicting ovarian response and clinical outcome of in vitro fertilization-embryo transfer (IVF-ET). METHODS: A total of 1319 oocyte retrieval cycles in women with an AFC≤10 and complete IVF/ICSI cycles were analyzed retrospectively. According to the AFC, the patients were divided into groups A, B, and C with AFC≤4, of 5-7, and of 8-10, respectively, and each was further divided into <38 years old group and ≥38 years old group. The oocytes retrieved, ovarian response, implantation rate, cancellations, pregnancy, pregnancy loss, and live births were evaluated. RESULTS: As the AFC increased, the total gonadotrophin (Gn) dose increased and the follicles aspirated and oocytes retrieved decreased significantly (P<0.001). Patients below 38 years of age had a lower total Gn dose and more follicles aspirated and oocytes retrieved than older patients. An AFC>7 and age≥38 years was associated with significantly lower total Gn dose, greater number of follicles aspirated and oocytes retrieved, and lower pregnancy rate than an AFC≤7 and age<38 years (P<0.05). Bivariate correlation and linear regression analysis identified AFC as the best single predictor of ovarian response in IVF. The pregnancy rate differed significantly between the 3 groups, and older patients (≥38 years) had higher early miscarriage rate. CONCLUSION: Antral follicle count≤7 or age≥38 years old with AFC≤10 is the suitable threshold of diminished ovarian reserve in controlled ovarian stimulation for infertile women. Combination of AFC and age is the best predictor of ovarian response in IVF. Age has a better predictive value of pregnancy rate than AFC. AFC influences mainly the oocytes quantity, while age also affects oocyte quality.

Study of DNA methylation patterns of imprinted genes in children born after assisted reproductive technologies reveals no imprinting errors: A pilot study.

Assisted reproductive technology (ART) including in vitro fertilization (IVF) and intracytoplasmic sperm injection (ICSI) have been shown to be associated with abnormal genomic imprinting, thus increasing the incidence of imprinting disorders such as Beckwith-Wiedemann syndrome (BWS) and Angelman syndrome (AS) in ART-conceived children. Furthermore, a recent study described abnormal DNA methylation in clinically normal children conceived by ART. However, data from different studies are conflicting or inconclusive. This study examined DNA methylation patterns of multiple imprinted genes in children born after ART to primarily evaluate the impact of ART on genomic imprinting. A total of 101 newborns conceived by ART (40 ICSI and 61 IVF) and 60 naturally conceived newborns were involved in our study. After obtaining the approval of the Institutional Ethics Committee, umbilical cord blood was collected from each infant. Genomic DNA was isolated from each blood sample and treated using sodium bisulfite. Subsequently, using methylation-specific PCR (MS-PCR), we analyzed six differentially methylated regions (DMRs) including KvDMR1, SNRPN, MEST, MEG3, TNDM and XIST. Meanwhile, information regarding twin pregnancies, gestational age, and birth weight of the neonates was documented. None of the cases presented with phenotypic abnormalities. Children conceived by ART were more likely to have low birth weight and to be born before term, compared with children conceived spontaneously. However, 7 months to 3 years of clinical follow-up showed that none of the children had clinical symptoms of any imprinting diseases. Furthermore, the MS-PCR results showed that all 161 children had normal DNA methylation patterns at six DMRs despite the different mode of conception. Our data did not indicate a higher risk of DNA-methylation defects in children born after ART. However, further studies using quantitative methods are needed to confirm these results.

[Cochlear implantation with suprameatal approach in Chinese children].

OBJECTIVE: To investigate the technique of the suprameatal approach for cochlear implantation in Chinese profound sensory hearing loss children. METHODS: Suprameatal approach for cochlear implantation were used in 50 cases (total 53 ears) with profound sensory hearing loss from May 2005 to January 2007. The electrode was passed through the suprameatal tunnel and went between the incus and chorda tympani into the scala tympani. RESULTS: Electrodes were completely inserted in 51 ears. There were no postoperative complications in all cases. Although the long effect need to be observed, all cases received better hearing and speech development benefit from cochlear implantation in the follow-up period. Among the 50 cases, 26 had speech perception in the open condition; 18 patients could speak short sentences although not clearly; and 6 patients learned to speak individual words only. CONCLUSIONS: The suprameatal approach was found to be a simple and safe technique that does not need mastoidectomy and avoid endangering the facial nerve and the chorda tympani. It enables wide exposure of middle ear and is especially suitable for cases with narrow facial recess or anteriorly located facial nerve.

[Significance of CT in diagnosis of chronic suppurative otitis media].

OBJECTIVE: To investigate the methods of preoperative diagnosis and differentiation of different pathological tissue in middle ear and mastoid. METHODS: The temporal bone lamellar CT findings in 106 patients with chronic suppurative otitis media (including cholesteatoma) were retrospectively analyzed. The CT value of pathological tissue were measured for 183 times and were compared with the surgical findings and postoperative pathological findings to definitude the CT value range of different pathological tissue. Sixty patients taken from 106 patients at random were analyzed and made the diagnosis again by the same doctor team according to the CT value of the different pathological tissue and surrounding histoclasia resulted by pathological tissue. The diagnose accordance rate was compared with the routine diagnose report from radiology department. The predetective diagnosis was made in 10 patients with chronic suppurative otitis media according to clinical manifestation (pathological changes of tympanic membrane, nature of otorrhea, character of hearing), temporal bone lamellar CT finding (CT value of pathological tissue, surrounding histoclasia) to validate the value of this study for preoperative diagnosis and differentiation of different pathological tissue in middle ear and mastoid. RESULTS: The CT value of cholesteatoma, granulation tissue, cholesteatoma combined with granulation tissue, effusion, calcified tissue, thickened and polypoid membrane was respectively (46.6 +/- 10.3) Hu, (26.6 +/-7.4) Hu, (42.1 +/- 11.4) Hu, (- 24.6 +/- 9.2) Hu, (223.6 +/- 63.7) Hu, (23.8 +/- 8.5) Hu. The diagnose accordance rate in 60 patients who were analyzed and made diagnosis again according to the CT value of the different pathological tissue and surrounding histoclasia resulted by pathological tissue raised from 68. 3% to 81.7% ( P < 0.05) . The predetective diagnose accordance rate reached at 90% according to clinical manifestation, temporal bone lamellar CT. CONCLUSIONS: It was not reliable to diagnose and differentially diagnose different pathological tissue in middle ear and mastoid only by the CT value, however, the CT value could still be considered to be a very significant information. The accurate rates of diagnosis and differentiation of different pathological tissue in middle ear and mastoid obviously raised by synthetically analyzing various kinds of pathological tissues in middle ear and mastoid according to clinical manifestation, temporal bone lamellar CT finding.

[Study on properties and resonance rayleigh scattering spectra of nanometer selenium(0) particles in liquid phase].

In the HCl solution, selenium (IV) and excessive ascorbic acid (Vc) formed selenium(0), which homogeneously and steadily existed in liquid phase system. The Se(0) particles were aggregating spheres and their sizes were 26-243 nm from transmission electron microscope (TEM) and laser light scattering image. The nanometer Se(0) solution produced strongest resonance rayleigh scattering (RRS) at 470 nm. The intensity of RRS at 470 nm was linear with the concentration of Se(IV) in the range of 2.82 x 10(-9) -5.64 x 10(-6) g x mL(-1) (r = 0.997). Moreover, obvious Second-order scattering (SOS) and multiple frequence scattering (MFS) appeared at the same time.