Effects of silencing hsa_circ_0015326 on proliferation, migration, invasion, and apoptosis of epithelial ovarian cancer cells.

Although the treatment of ovarian cancer has made great progress, there are still many patients who are not timely detected and given targeted therapy due to unknown pathogenesis. Recent studies have found that hsa_circ_0015326 is upregulated in ovarian cancer and is involved in the proliferation, invasion, and migration of ovarian cancer cells. However, whether hsa_circ_0015326 can be used as a new target of ovarian cancer needs further investigation. Therefore, the effect of hsa_circ_0015326 on epithelial ovarian cancer was investigated in this study. At first, si-hsa_circ_0015326 lentivirus was transfected into epithelial ovarian cancer cells. Then real-time fluorescence quantitative PCR (qRT-PCR) was used to detect hsa_circ_0015326 level. The proliferation of ovarian cancer cells was detected by CCK-8 assay. The horizontal and vertical migration abilities of the cells were detected by wound-healing assay and Transwell assay, respectively. Transwell assay was also used to determine the invasion rate. As for the apoptosis rate, it was assessed by flow cytometry. As a result, the expression level of hsa_circ_0015326 in A2780 and SKOV3 was found to be higher than that in IOSE-80. However, after transfecting si-hsa_circ_0015326 and si-NC into the cells, the proliferation, migration, and invasion abilities of A2780 and SKOV3 cells in the si-hsa_circ_0015326 group were significantly reduced in comparison to those in the si-NC and mock groups, while their apoptosis rates were elevated. Collectively, silencing hsa_circ_0015326 bears the capability of inhibiting the proliferation, migration, and invasion of ovarian cancer cells while increasing apoptosis rate. It can be concluded that hsa_circ_0015326 promotes the malignant biological activities of epithelial ovarian cancer cells.

The effects of chromosome polymorphism on the clinical outcomes of in vitro fertilization/embryo transfer-assisted reproduction.

OBJECTIVE: To investigate the effects of chromosome polymorphism on the clinical outcomes of in vitro fertilization/embryo transfer (IVF/ET)-assisted reproductive technology. METHODS: The case data of 2740 patients treated between January 2018 and January 2019 were retrospectively analyzed. The patients were organized into two groups: a case group and a control group. In the case group (n = 81), one or both parents were characterized by chromosomal polymorphism; in the control group (n = 2659), both parents had normal chromosome karyotyping. The primary outcomes included clinical pregnancy rate (clinical pregnancy rate of fresh transfer cycles = number of clinical pregnancy cycles/number of fresh embryo transfer cycles × 100%) and live birth rate (live birth rate per fresh transfer cycles = number of live births/numbers of fresh embryo transfer cycles × 100%). The propensity score matching (PSM) method was used for statistical analysis. RESULTS: After PSM 1:2 matching for the patients in the two groups, 72 patients were successfully matched. The clinical pregnancy rate and live birth rate in the case group were lower than in the control group before PSM (clinical pregnancy rate: 33.30% case group vs. 46.60% control group, p = .020; live birth rate: 30.90% case group vs. 47.90% control group, p = .03). The differences were statistically significant (p < .05). The live birth rate in the case group was also significantly lower than in the control group after PSM (34.98% case group vs. 74.52% control group; p = .028). The correlation coefficient between clinical pregnancy and grouping (i.e. if there was a characteristic chromosome polymorphism) was -.045 (p = .02), while the correlation coefficient between live birth and grouping was -.046. CONCLUSION: Chromosome polymorphism is weakly negatively correlated with live birth in IVF/ET-assisted reproduction and can significantly reduce the live birth rate of patients.

SUMO1-modified DNA methyltransferase 1 induces DNA hypermethylation of VWC2 in the development of colorectal cancer.

Aberrant DNA methylation of genes is closely linked to many aspects of tumor development. This study focuses on the effect of DNA hypermethylation of von Willebrand factor C domain containing 2 (VWC2) on colorectal cancer (CRC) progression and the underpinning mechanism. According to data in the bioinformatic systems, VWC2 had the highest degree of DNA methylation in colonic adenocarcinoma, and it showed DNA hypermethylation in rectal adenocarcinoma as well. CRC and the para-tumorous tissues were collected from 86 patients. VWC2 was expressed at low levels in CRC samples and inversely correlated with tumor stage and tumor biomarker expression. DNA hypermethylation and reduced expression of VWC2 were also detected in CRC cell lines HCT-116 and HT29. VWC2 overexpression suppressed the malignant growth of cells in vitro and in vivo. Co-immunoprecipitation and western blot assays showed that small ubiquitin-like modifier 1 (SUMO1) mediated SUMOylation of DNA methyltransferase 1 (DNMT1) and strengthened its protein stability, which promoted DNA methylation and suppression of the VWC2 gene. In summary, this study demonstrates that SUMO1-mediated activation of DNMT1 induces DNA methylation and downregulation of VWC2 in CRC to augment cancer development.

Erratum: Ovarian cancer proliferation and apoptosis are regulated by human transfer RNA methyltransferase 9-like via LIN9.

[This corrects the article DOI: 10.3892/ol.2017.6750.].

A Non-Lipolysis Nanoemulsion Improved Oral Bioavailability by Reducing the First-Pass Metabolism of Raloxifene, and Related Absorption Mechanisms Being Studied.

OBJECTIVE: A non-lipolysis nanoemulsion (NNE) was designed to reduce the first-pass metabolism of raloxifene (RAL) by intestinal UDP-glucuronosyltransferases (UGTs) for increasing the oral absorption of RAL, coupled with in vitro and in vivo studies. METHODS: In vitro stability of NNE was evaluated by lipolysis and the UGT metabolism system. The oral bioavailability of NNE was studied in rats and pigs. Finally, the absorption mechanisms of NNE were investigated by in situ single-pass intestinal perfusion (SPIP) in rats, Madin-Darby canine kidney (MDCK) cells model, and lymphatic blocking model. RESULTS: The pre-NNE consisted of isopropyl palmitate, linoleic acid, Cremophor RH40, and ethanol in a weight ratio of 3.33:1.67:3:2. Compared to lipolysis nanoemulsion of RAL (RAL-LNE), the RAL-NNE was more stable in in vitro gastrointestinal buffers, lipolysis, and UGT metabolism system (p < 0.05). The oral bioavailability was significantly improved by the NNE (203.30%) and the LNE (205.89%) relative to the suspension group in rats. However, 541.28% relative bioavailability was achieved in pigs after oral NNE intake compared to the suspension and had two-fold greater bioavailability than the LNE (p < 0.05). The RAL-NNE was mainly absorbed in the jejunum and had high permeability at the intestine of rats. The results of both SPIP and MDCK cell models demonstrated that the RAL-NNE was absorbed via endocytosis mediated by caveolin and clathrin. The other absorption route, the lymphatic transport (cycloheximide as blocking agent), was significantly improved by the NNE compared with the LNE (p < 0.05). CONCLUSION: A NNE was successfully developed to reduce the first-pass metabolism of RAL in the intestine and enhance its lymphatic transport, thereby improving the oral bioavailability. Altogether, NNE is a promising carrier for the oral delivery of drugs with significant first-pass metabolism.

[Metabonomics research strategy based on microdialysis technique].

Metabonomics is the branch of systems biology. It has been widely used in the fields of diagnostic markers discovery, disease prognosis, drug action mechanism, drug efficacy and toxicity evaluation, traditional Chinese medicine syndromes differentiation. There are shortcomings in the conventional metabonomics research. Microdialysis technology is a new type of biosampling technology, and metabonomics research based on microdialysis technology is in the ascendant. In view of the particularity of microdialysis technology and its great differences from traditional sampling and pretreatment methods, the metabonomics process based on microdialysis technology has certain similarities with traditional metabonomics research, and its basic process has some particularity. Advantages and basic strategies of metabonomics research by microdialysis technology are systematically summarized for researchers' reference.

[Brain lipidomics of intervention effect of Salviae Miltiorrhizae Radix et Rhizoma and Chuanxiong Rhizoma on ischemic stroke based on UPLC-Q-TOF-MS technique].

The aim of this paper was to investigate the intervention effect of Salviae Miltiorrhizae Radix et Rhizoma and Chuanxiong Rhizoma on brain lipid metabolism in rats with ischemic stroke. The ischemic stroke rat model was established by middle cerebral artery occlusion( MCAO) method. The brain tissues were collected after the last administration with Salviae Miltiorrhizae Radix et Rhizoma and Chuanxiong Rhizoma decoction lyophilizate. UPLC-Q-TOF-MS was used to carry out the brain lipidomics study. The lipidomics data were processed with the OPLS-DA model to find out the lipid regulation effect of Salviae Miltiorrhizae Radix et Rhizoma combined with Chuanxiong Rhizoma on ischemic stroke. The results showed that Salviae Miltiorrhizae Radix et Rhizoma and Chuanxiong Rhizoma decoction lyophilized powder can significantly alleviate brain lipidomics profiles in middle cerebral artery occlusion model rats. Eleven differential lipid metabolites in ischemic stroke model were identified. In this experiment,the protective effects of Salviae Miltiorrhizae Radix et Rhizoma and Chuanxiong Rhizoma decoction lyophilized powder on cerebral ischemia injury was verified,which might be related to the regulation of abnormal lipid metabolism.

Ovarian cancer proliferation and apoptosis are regulated by human transfer RNA methyltransferase 9-likevia LIN9.

Current traditional treatment options have little impact on the long-term survival of patients with ovarian cancer due to a lack of understanding of the molecular transformations that occur in ovarian carcinoma. Transfer RNAs (tRNAs) perform a key role in protein translational fidelity. Enzymes involved in tRNA modification may function as regulators of cancer progression. Human tRNA methyltransferase 9-like (hTRM9L) catalyzes tRNA wobble base modifications, which regulate ovarian cancer growth and apoptosis via the retinoblastoma protein (pRB) and p53 signaling pathways. The aim of the present study was to confirm the role of hTRM9L in the proliferation and apoptosis of ovarian cancer. Immunohistochemistry was performed to investigate the expression of hTRM9L and LIN9 in 70 ovarian tissues. hTRM9L was amplified by polymerase chain reaction (PCR) and inserted into the Ubi-multiple cloning site-enhanced green fluorescent protein (EGFP)-internal ribosome entry site-puromycin lentiviral expression vector to create the Ubi-KIAA1456-EGFP-puromycin (LV-KIAA1456) vector. The lentiviruses were subsequently compounded and transduced into HO8910PM cells. hTRM9L, LIN9 and B-cell lymphoma 2 (Bcl-2)/Bcl-2 associated X protein (Bax) expression levels were examined by PCR and western blot analysis. Apoptosis was verified by flow cytometry, and cell proliferation was evaluated using Cell Counting Kit-8. hTRM9L and LIN9 expression were reduced in the ovarian cancer group, and there was a positive correlation between hTRM9L and LIN9 expression according to Pearson's correlation coefficient (r=0.406; P<0.05). hTRM9L was increased by 2-3-foldin HO8910PM cells following LV-hTRM9L transduction. The expression of hTRM9L at the mRNA and protein levels in HO8910PM cells that were transfected with LV-hTRM9L was significantly increased compared with the negative control, as confirmed by reverse transcription-quantitative PCR and western blot analysis, respectively (P<0.05). The same was observed for LIN9 and Bax (P<0.05). By contrast, Bcl-2 was downregulated in LV-hTRM9L (P<0.05). Furthermore, cell growth was inhibited (P<0.05) and apoptosis increased (P<0.05). In the present study, hTRM9L was shown to prevent tumor growth and promote apoptosis by regulating LIN9, which is associated with the pRB and p53 signaling pathways. This maybe a novel breakthrough in the treatment of ovarian cancer.

An internet-based food frequency questionnaire for a large Chinese population.

BACKGROUND AND OBJECTIVES: National dietary surveys are needed and difficult to conduct in China. The current study aims to develop and validate an internet-based diet questionnaire for Chinese (IDQC) to assess intakes in Northern China. METHODS AND STUDY DESIGN: We recruited 292 city residents by email and telephone in Harbin to obtain the IDQC and 3-day diet diaries. The food group and nutrient intakes from the IDQC were validated against those from the 3-day diet diaries. Paired sample t-tests were used to compare the methodological differences, and repeatability was estimated using Pearson's correlations. Cross-classification was used to calculate the percentage agreement in quartiles for all food groups and nutrients. RESULTS: Positive correlations were found between the IDQC and 3-day diet diaries for all food groups after energy adjustment (from 0.28 for seeds and nuts to 0.63 for dairy products). Positive correlations were observed for all nutrients between the IDQC and 3-day diet diaries, with correlations ranging from 0.37 for folic acid to 0.98 for iodine. The overall agreements for food groups and nutrients were above 69.2%, indicating satisfactory consistency between the IDQC and 3-day diet diaries. CONCLUSIONS: The IDQC can be used to estimate the food and nutrient intakes in a Northern China population for both clinical nutrition epidemiological and public health nutritional purposes. The questionnaire system IDQC (v1.0) is freely available at http://www.yyjy365.org/diet/.

Anti-Trimeresurus albolabris venom IgY antibodies: preparation, purification and neutralization efficacy.

BACKGROUND: Snakebite incidence in southwestern China is mainly attributed to one of the several venomous snakes found in the country, the white-lipped green pit viper Trimeresurus albolabris. Since antivenom produced from horses may cause numerous clinical side effects, the present study was conducted aiming to develop an alternative antivenom antibody (immunoglobulin Y - IgY) from leghorn chickens. METHODS: IgY in egg yolk from white leghorn chicken previously injected with T. albolabris venom was extracted by water, precipitated by ammonium sulfate and purified by affinity chromatographic system. IgY was identified by SDS-PAGE, ELISA and Western blot, and its neutralizing assay was conducted on mice. RESULTS: Chickens injected multiple times with T. albolabris venom elicited strong antibody responses, and from their egg yolk IgY was isolated and purified, which exhibited a single protein band on SDS-PAGE and two bands (about 65 and 35 kDa, respectively) under reduced conditions. Immunoblot analysis revealed that these IgY are polyclonal antibodies since they bind with most venom components. In the neutralizing assay, all mice survived while the ratios of IgY/venom reached up to 3.79 (50.0 mg/13.2 mg). CONCLUSIONS: IgY antibody response was successfully conducted in white leghorn chicken injected with T. albolabris venom. IgY against T. albolabris venom was obtained for the first time, and it exhibited strong neutralizing potency on mice. These results may lay a foundation for the development of IgY antivenom with clinical applications in the future.

Research progress on berberine with a special focus on its oral bioavailability.

The natural product berberine (BBR) has become a potential drug in the treatment of diabetes, hyperlipidemia, and cancer. However, the oral delivery of BBR is challenged by its poor bioavailability. It is necessary to improve the oral bioavailability of BBR before it can be used in many clinical applications. Understanding the pharmacokinetic characteristics of BBR will enable the development of suitable formulas that have improved oral bioavailability. The key considerations for BBR are how to enhance the drug absorption and to avoid the intestinal first-pass effect. This review summarizes the pharmacological activities of BBR and analyzes the factors that lead to its poor oral bioavailability. In particular, the therapeutic potential of BBR in new indications from the aspect of oral bioavailability is discussed. In conclusion, BBR is a promising drug candidate for metabolic disorders and cancer but faces considerable challenges due to its poor oral bioavailability.

Anti-Trimeresurus albolabris venom IgY antibodies: preparation, purification and neutralization efficacy

Snakebite incidence in southwestern China is mainly attributed to one of the several venomous snakes found in the country, the white-lipped green pit viper Trimeresurus albolabris. Since antivenom produced from horses may cause numerous clinical side effects, the present study was conducted aiming to develop an alternative antivenom antibody (immunoglobulin Y - IgY) from leghorn chickens. Methods IgY in egg yolk from white leghorn chicken previously injected with T. albolabris venom was extracted by water, precipitated by ammonium sulfate and purified by affinity chromatographic system. IgY was identified by SDS-PAGE, ELISA and Western blot, and its neutralizing assay was conducted on mice. Results Chickens injected multiple times with T. albolabris venom elicited strong antibody responses, and from their egg yolk IgY was isolated and purified, which exhibited a single protein band on SDS-PAGE and two bands (about 65 and 35 kDa, respectively) under reduced conditions. Immunoblot analysis revealed that these IgY are polyclonal antibodies since they bind with most venom components. In the neutralizing assay, all mice survived while the ratios of IgY/venom reached up to 3.79 (50.0 mg/13.2 mg). Conclusions IgY antibody response was successfully conducted in white leghorn chicken injected with T. albolabrisvenom. IgY against T. albolabris venom was obtained for the first time, and it exhibited strong neutralizing potency on mice. These results may lay a foundation for the development of IgY antivenom with clinical applications in the future.

Anti-Trimeresurus albolabris venom IgY antibodies: preparation, purification and neutralization efficacy

Background Snakebite incidence in southwestern China is mainly attributed to one of the several venomous snakes found in the country, the white-lipped green pit viper Trimeresurus albolabris. Since antivenom produced from horses may cause numerous clinical side effects, the present study was conducted aiming to develop an alternative antivenom antibody (immunoglobulin Y - IgY) from leghorn chickens. Methods IgY in egg yolk from white leghorn chicken previously injected with T. albolabris venom was extracted by water, precipitated by ammonium sulfate and purified by affinity chromatographic system. IgY was identified by SDS-PAGE, ELISA and Western blot, and its neutralizing assay was conducted on mice. Results Chickens injected multiple times with T. albolabris venom elicited strong antibody responses, and from their egg yolk IgY was isolated and purified, which exhibited a single protein band on SDS-PAGE and two bands (about 65 and 35 kDa, respectively) under reduced conditions. Immunoblot analysis revealed that these IgY are polyclonal antibodies since they bind with most venom components. In the neutralizing assay, all mice survived while the ratios of IgY/venom reached up to 3.79 (50.0 mg/13.2 mg). Conclusions IgY antibody response was successfully conducted in white leghorn chicken injected with T. albolabrisvenom. IgY against T. albolabris venom was obtained for the first time, and it exhibited strong neutralizing potency on mice. These results may lay a foundation for the development of IgY antivenom with clinical applications in the future.(AU)

Development and Applicability of an Internet-Based Diet and Lifestyle Questionnaire for College Students in China: A Cross-Sectional Study.

Diet contributes to the increasing incidence of chronic diseases. Thus, fast, accurate, and convenient dietary assessment tools are in demand. We designed an internet-based diet and lifestyle questionnaire for Chinese (IDQC). The objective of this study was to validate its applicability and assess the dietary habits of Chinese college students.Six hundred forty-four college students from northern China were recruited and asked to complete the IDQC for the last 4 months (135 food items) and 3-day diet records (3DDRs). Food and nutrient intakes recorded in the IDQC were validated against those in the 3DDRs using the Wilcoxon matched-pairs t test, correlation analysis, and cross-classification. The Student t and χ tests were used in the dietary assessment.There were significantly positive correlations in the dietary intakes of 9 food groups and 23 nutrients between the IDQC and 3DDRs. All participants consumed low levels of fruits, vegetables, legumes, dairy, and certain micronutrients (ie, vitamin A, vitamin B1, vitamin B2, folic acid, vitamin C, calcium, selenium, and iodine), and high levels of iron and manganese. Male students consumed higher intakes of the food groups and nutrients than female students.The IDQC represents an accurate and convenient dietary assessment tool that can be used in large populations. Inadequate and excessive nutrition co-existed in college students, and more fruits, vegetables, legumes, dairy, and various vitamins and minerals were needed in this population's daily diet. The IDQC is free of access at www.yyjy365.org/diet.

Pharmacokinetics of salvianolic acid A after single intravenous administration in Rhesus monkey / 药学学报

Salvianolic acid A (Sal A) is one of the most effective compounds isolated from the root of Salvia miltiorrhiza. Up to now, several studies regarding the pharmacokinetic profiles of Sal A have been reported, however there is no such study reported in monkeys, the species which is more similar to human. The aim of this study is to develop a LC-MS method for the determination of Sal A in monkey plasma and apply it to the pharmacokinetic studies of monkeys. After single intravenous administration of Sal A, the plasma concentration-time curves were observed and the main pharmacokinetic parameters were calculated. The plasma concentration at 2 min (C2 (min)) values were (28.343 ± 6.426), (45.679 ± 12.301) and (113.293 ± 24.360) mg x L(-1) for Rhesus monkeys treated with Sal A at 2.5, 5 and 10 mg x kg(-1). The area under the concentration-time curve (AUC(0-∞)) values were (3.316 ± 0.871), (5.754 ± 2.150) and (13.761 ± 2.825) μg x L(-1) x h, respectively. Furthermore, this method was improved and applied to the simultaneous determination of Sal A, Sal B and Sal C, which provided useful information for preclinical studies and clinical trials of Sal A, Sal B and Sal C.

Effect of Xiongbing compound on the pharmacokinetics and brain targeting of tetramethylpyrazine.

OBJECTIVES: To investigate the effect of the Xiongbing compound (XBC) on the pharmacokinetics and brain targeting of tetramethylpyrazine (TMP). METHODS: Three microemulsions containing the same TMP concentration were prepared. XBC microemulsions were made from Rhizoma ligustric Chuanxiong extracts, borneol and TMP. TMP microemulsions were made with TMP only. Borneol microemulsions contained borneol and TMP. Microdialysis with high performance liquid chromatography (HPLC) was used to measure the concentration of TMP in the blood and striatum after intravenous (i.v.) or intragastric (i.g.) administration of the three different microemulsions. KEY FINDINGS: The pharmacokinetics of free TMP concentration in the blood and the striatum fit a first-order rate, open two-compartment model after intravenous and intragastric microemulsion administration. The maximal concentration (C(max) ) and area under curve (AUC) values in the XBC microemulsion i.v. group were significantly higher than that in the TMP microemulsion and borneol microemulsion i.v. groups. After XBC microemulsion i.g. administration, the t(½), mean residence time (MRT) and AUC of TMP in both plasma and brain tissues were greater than those with TMP microemulsion and borneol microemulsion administration. The relative brain targeting efficiency of TMP for the XBC microemulsion i.v and i.g. groups relative to the TMP microemulsion and borneol microemulsion groups were greater than 1. CONCLUSION: XBC microemulsion can enhance TMP oral bioavailability, brain targeting and tissue distribution, mainly through a synergistic action of Rhizoma ligustric Chuanxiong extracts and borneol.

[Study of pharmacokinetics of nicotine in local brain by using microdialysis and stable labeled isotope].

The paper is to report the study of pharmacokinetics of transdermal administered nicotine in the brain of freely moving rat by using microdialysis with stable labeled isotope as internal standard. The pharmacokinetic behavior of nicotine in Sprague Dawley rat brain was investigated after intranasal administration (3.75 mg). Brain fluid samples were collected by intracerebral microdialysis with DL-nicotine as internal standard. Concentrations of nicotine and DL-nicotine in the sample were measured by HPLC-MS/MS. Main pharmacokinetic parameters were calculated and analyzed by Das 2.0 pharmacokinetic software. The recovery of nicotine and the delivery of DL-nicotine were the same. The fate of absorption and distribution was two compartment model and the values of t1/2alpha was 170.31 min, t1/2beta was 263.30 min and the AUC(0-infinity) was 2.75 x 10(5) microg x L(-1) min separately. DL-nicotine can be used to calibrate the recovery of nicotine, and the new method of stable isotope microdialysis can be used to study the pharmacokinetics of freely moving rat. It will make sense for the treatment of addiction of tobacco and provide a new thought for the research of pharmacokinetics-pharmacodynamic combination.

[The pharmacokinetics study on Sinomenine transdermal patch on anaesthetized Beagle dogs].

OBJECTIVE: To explore the pharmacokinetic of Sinomenine transdermal patch. METHODS: The plasma drug concentration of Beagle dogs was determined after administration with HPLC-UVD as analysis tools. The pharmacokinetics parameters were fitted with kinetica software package. RESULTS: The exclusive analysis method was established with the following pharmacokinetics parameters: T (peak) = 8 h, Cmax = 366 ng/mL, MRT = 13 h. The pharmacokinetic characteristics was accordance with one-order rate and two-compartment model. CONCLUSION: The method is preferable to be applied to the pharmacokinetics research and further applied pharmacological study which will play a reference role in clinical application.

[Study on fault diagnosis of power-shift steering transmission based on spectrometric analysis and SVM].

Spectrometric oil analysis is an important method to study the running state of Power-Shift Steering Transmission (PSST). A method of multiple out least squares support vector regression was developed using spectrometric oil analysis data and SVM (Support Vector Machine). The spectrometric oil analysis data were studied using multiple out least squares support vector regression. It has been proved that the regression data are good in approximation effect for No. 1 PSST. And the predictive values for No. 2 PSST are highly veracious with the test data. The fault information was found and the fault position was determined through compar4tive analysis. This method has been proved to have practice significance for finding fault-hidden dangers and judging fault positions.

[Health state evaluation of power-shift steering transmission using PCA-AHP methodology based on spectrometric oil analysis].

Spectrometric oil analysis is an important method to study the running state of power-shift steering transmission (PSST). An evaluation model of PSST health state was developed on the basis of the theories of principal component analysis (PCA) and analytic hierarchy process (AHP) using spectrometric oil analysis data. Considering the concept of mechanical equipment and wear elements in spectrometric oil analysis data, the health value was employed to quantitatively describe the running state degree of PSST, and the grades of health state were classified based on the health values. The oil analysis data were studied during the process of choosing principal components. The weight vectors of principal components were obtained by using the AHP method. In the course, the conformation of judgement matrix and the consistency check were also studied. The evaluation model was developed by combining the PCA and AHP methods. This model has been proved to have better accuracy in evaluating the running state of PSST. This work is important for developing state evaluation of PSST.