68 results on '"Di Jiao"'
Search Results
52. Cytotoxicity of the Defensive Secretion from the Medicinal Insect Blaps rynchopetera.
- Author
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Xiao, Huai, Dong, Jian-Wei, Zhou, Di-Jiao, Wu, Xiu-Mei, Luo, Jian-Rong, Zhang, Cheng-Gui, Guo, Na-Na, Li, Yue, Cai, Le, and Ding, Zhong-Tao
- Subjects
INSECT secretions ,ANTINEOPLASTIC agents ,BENZOQUINONES ,HYDROQUINONE ,TENEBRIONIDAE ,INSECT defenses ,CHINESE medicine - Abstract
Blaps rynchopetera Fairmaire has long been used as a folk medicine by the Yi and Bai ethnic groups in China to treat fever, cough, gastritis, boils, and tumors. In the present study, the cytotoxicity of the defensive secretion (TDS) of B. rynchopetera against AGS Caco-2, HepG2 U251 and Bel-7402 was tested, and the results revealed that TDS had potent cytotoxicity against testing cells with IC50 values of 45.8, 17.4, 53.6, 98.4 and 23.4 g/mL, respectively. Gas chromatography-mass spectrometry (GC-MS) analysis was employed to clarify the cytotoxic constituents in TDS of B. rynchopetera and five volatile compounds, including 2-ethyl-2,5-cyclohexadiene-1,4-dione (3, 31.00%), 1-tridecene (5, 28.02%), 2-methyl-2,5-cyclohexadiene-1,4-dione (2, 22.86%), hydroquinone (4, 1.33%), and p-benzoquinone (1, 1.01%), were identified. Chemical constituent investigation on TDS further supported the presence of 5 above compounds. A cytotoxic assay indicated that compounds 1, 2, 3 and 4 exhibited significant cytotoxicity against the testing cell lines, implying that benzoquinones and hydroquinone played important roles in the cytotoxicity of TDS of B. rynchopetera. TDS is a cytotoxic natural material and further studies investigating mechanisms and inhibitory activities on other cell lines is warranted. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
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53. Dynamic Filtration of Invert-Emulsion Muds
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Di Jiao and Mukul M. Sharma
- Subjects
Capillary pressure ,Lost circulation ,Mechanical Engineering ,Energy Engineering and Power Technology ,Mineralogy ,Filter cake ,chemistry.chemical_compound ,Permeability (earth sciences) ,chemistry ,Asphalt ,Drilling fluid ,parasitic diseases ,Emulsion ,Petroleum - Abstract
Summary Dynamic-filtration experiments conducted on oil-based muds show that the dynamic-filtration rate is much higher than API filtration rates. The use of water-wet solids results in very poor-quality external mudcakes and high fluid-loss rates. Better external mudcakes are formed by mixing equal parts organophilic clay and mud. Filtration-loss-control additives (asphalt mineral pitches) do not reduce the equilibrium filtration rate, but do reduce spurt loss and limit solids invasion. In brine-saturated rocks, the invasion rate for oil-based muds is significantly smaller than for water-based muds because capillary pressure prevents the oil phase from entering the core in oil-based muds. Oil-based mudcakes are softer and more shear-sensitive than water-based mudcakes. Scanning electron microscope (SEM) photomicrographs indicate that oil-based mudcakes consist of individual water droplets coated with clay particles. This cake structure gives rise to the low permeability and shear sensitivity of oil-based muds.
- Published
- 1993
54. Financial Security Evaluation in Power Production Industry Based on BP Neural Network Optimized by Genetic Algorithm
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Lin, Jiao, primary, Shuo, Yao, primary, and Di, Jiao, primary
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- 2015
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55. Genetic polymorphisms of 9 non-combined of DNA index system short tandem repeat loci of Chinese Tibetan ethnic minority group in Tibet
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Binwu Ying, Xiaojun Lu, Jun Wang, Lanlan Wang, Xingbo Song, Yi Zhou, MeiLangQuCuo, Ran Ren, Di-jiao Tang, Yuanxin Ye, Jiaming Liu, Xin Hu, and Lei Zhang
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Genetics ,Male ,Minority group ,Polymorphism, Genetic ,STR multiplex system ,Ethnic group ,Biology ,Tibet ,DNA Fingerprinting ,Polymerase Chain Reaction ,Pathology and Forensic Medicine ,law.invention ,Variable number tandem repeat ,Genetics, Population ,DNA profiling ,Gene Frequency ,law ,Ethnicity ,Microsatellite ,Humans ,Allele frequency ,Polymerase chain reaction ,Microsatellite Repeats - Published
- 2009
56. Investigation of Dynamic Mud Cake Formation: The Concept of Minimum Overbalance Pressure
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Di Jiao and Mukul M. Sharma
- Subjects
Petroleum engineering ,Geotechnical engineering ,Geology - Abstract
Abstract Dynamic filtration experiments were conducted on cores with water based muds at different mud flow rates. It was observed that the thickness of the mud cake was a sensitive function of the mud rheology, the mud shear rate and the permeability of the rock. A model was developed to relate the process of cake buildup under dynamic conditions to the mud and rock properties. Excellent agreement between the model and the experiments was obtained. As predicted by the model (and observed experimentally) no cake was formed on rocks with low permeabilities when the overbalance pressure was reduced below some critical value. It has been generally accepted that no filter cakes form on rocks with very high permeability (lost circulation). It is shown in this paper that there is also a lower bound on the permeability below which no cake will form and that a minimum overbalance pressure must be maintained in the mud column to ensure mud cake formation. We also present equations that allow laboratory dynamic filtration results to be used directly to predict the critical permeability and the minimum overbalance pressure required for cake formation in the field. Introduction Mud cake formation on the wall of a wellbore is important from the point view of fluid loss and formation damage control. The low permeability mud cake significantly reduces the invasion of the mud solids and the mud filtrate (1, 2). It has been generally accepted that if an effective mud cake is formed, the mud filtration rate is independent of the overbalance drilling pressure. This occurs because the mud cake permeability decreases with increasing overbalance pressure. However, for low permeability formations, a mud cake may not be formed at all when small overbalance drilling pressures are used. In this case, low overbalance drilling pressures may result in an increase in the fluid loss rate and more damage due to mud solids invasion. Fordham et al (3) showed that for low permeability rocks, no mud cake was formed and the dynamic filtration rate was said to be 'medium-controlled'. Fisk et al (4) investigated dynamic mud cake formation by using the standard static filtration equation. They stated that if a plot of 1/q vs. filtrate volume per unit area is linear and with positive slope, mud cake is indicated. Outmans (5) proposed that particle removal from the cake surface depends on the friction coefficient between the particle and the cake surface and the tangential shear force. P. 79^
- Published
- 1993
57. Formation Damage and Fluid Loss in Crossflow Filtration of Drilling Muds
- Author
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Di, Jiao
- Subjects
Fluid loss ,parasitic diseases ,Drilling mud - Abstract
A systematic study of the formation damage and filtrate loss associated with the dynamic filtration of both water and oil based muds is presented. Experiments were conducted in a specially designed core holder to measure the permeability impairment and changes in resistivity as drilling mud is circulated past the face of a core. Four sections of the core were monitored to measure the depth of damage. The fluid loss rate as well as the return permeabilities were also measured. Seven kinds of water based muds and four kinds of oil based muds were used in the experiments. The experimental results show that the depth of invaded mud particles is strongly dependent on the mud composition. A mud overtreated by a thinner will cause deep mud particle invasion (more than 8 inches). However, for most muds used, the depth of particle invasion is limited to 2.5 inches. The results of resistivity measurements indicate that a broad transition zone exists between the mud filtrate and the resident brine. The width of the transition zone depends on the mud filtration rate. In the range of the filtration rates considered, only the first one vi or two inches of the core closest to the invasion face were completely flushed by the mud filtrate. For all the oil-based muds tested, the dynamic filtration rate is much higher than the API static filtration rate. The filtrate loss rate more than doubles when a finite oil saturation is present in the core. This suggests that the API static filtration test is not appropriate for oil based muds, and dynamic test on oil saturated cores needs to be conducted. Oil-based mud cakes consist primarily of water droplets stabilized by colloidal particles and emulsifiers. These mud cakes are not as shear resistant as water-based mud cakes. The use of water-wet solids results in very poor quality external cakes and high fluid loss rates. Better external mud cakes are formed by adding the same amount of organophilic clay to the mud. There exists a critical overbalance drilling pressure below which no filter cake will be formed on the formation face. This is particularly important in low permeability formations (k < 1 md). By drilling at overbalance pressures just above this critical pressure (thus ensuring cake formation) the formation damage caused by the mud solids can be minimized. The rheological properties of the mud (flow index n and consistency constant c in a power law fluid) have a significant effect on cake formation. For example, flocculated muds (high c and n values) need a high overbalance drilling pressure and a low mud flow rate to form a cake even though the filtration rate for this mud is high. Equations are provided in the dissertation that allow both the minimum overbalance pressure and the critical permeability to be computed from laboratory rheological and dynamic filtration data. Mud cake properties, such as porosity, permeability, and compressibility, were measured in the laboratory for all water based muds used in the study. These properties were used as input parameters in a model for dynamic filtration. Good agreement is obtained between the model calculation and experimental results.
- Published
- 1993
- Full Text
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58. Formation Damage Due to Static and Dynamic Filtration of Water-Based Muds
- Author
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Di Jiao and Mukul M. Sharma
- Subjects
Materials science ,Petroleum engineering ,law ,Filtration ,Water based ,law.invention - Published
- 1992
59. A method of cucumber transpiration rate forecast based on wavelet transform and dynamic neural network.
- Author
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SUN Guoxiang, YAN Tingting, WANG Xiaochan, CHEN Man, ZHANG Yu, DI Jiao, SHI Yinyan, and CHEN Jingbo
- Abstract
In order to analyze the relationship of nonlinear, coupling, delay between crop transpiration rate and greenhouse environment parameters, the time series of greenhouse environment parameters:air temperature, air humidity, soil temperature, solar radiation, leaf temperature, and soil moisture were used as inputs, and the transpiration rate of cucumber was used as output. The low-frequency and high-frequency time series by the method of wavelet decomposition-reconstruction were used to establish the prediction models of nonlinear autoregressive with external input (NARX) dynamic neural sub networks respectively, and the predicted value of the subnets were accumulated as the predicted value of transpiration rate of cucumber. The results showed that: the regression coefficients (R
2 ) between predicted values by the subnets based on the time series of low-frequency A1 and high-frequency D1 by one layer of wavelet decomposition-reconstruction and the target value of transpiration rate by decomposition-reconstruction were 0.949 and 0.853 respectively, and the mean absolute error(MAE)were 5.36 and 2.00 g.h-1 respectively. The regression coefficients between predicted values by the subnets based on the time series of low-frequency A2 and high-frequency D2 by two layers of wavelet decomposition-reconstruction and the target value of transpiration rate by decomposition-reconstruction were 0.983 and 0.849 respectively, and the MAE were 2.88 and 2.56 g.h-1 respectively. The regression coefficient between accumulated predictive values (A1+D1) by the NARX dynamic neural sub networks based on the time series of low-frequency A1 and high-frequency D1 by one layer of wavelet decomposition-reconstruction and the measured value of transpiration rate was 0.945, and the MAE was 5.76 g.h-1 . The regression coefficient between accumulated predictive values (A2+D2+D1) by the NARX dynamic neural sub networks based on the time series of low-frequency A2 and high-frequency D2 and D1 by two layers of wavelet decomposition-reconstruction and the measured value of transpiration rate was 0.974, and the MAE was 4.42 g.h-1 . The regression coefficients between predicted value of the original time series by the NARX dynamic neural network and the measured value of transpiration rate was 0.857, and the MAE was 10.09 g.h-1 . Synthetic time series of low-frequency and high-frequency time series of forecast, can improve the accuracy of time series prediction. The regression coefficients between predicted value of the original time series by the BP neural network and NAR neural network under the same network structure and the measured value of transpiration rate were 0.596 and 0.839 respectively, and the MAE were 19.55 and 9.45 g.h-1 respectively. The forecast performance of NARX was better than NAR and BP neural network, which can forecast the transpiration rate of cucumber in the greenhouse accurately. This method can be extended up to predict the parameters for the multivariable, nonlinear, strong coupling and delay system. [ABSTRACT FROM AUTHOR]- Published
- 2014
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60. Association between obesity and ECG variables in children and adolescents: A cross-sectional study.
- Author
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GUO-ZHE SUN, YANG LI, XING-HU ZHOU, XIAO-FAN GUO, XIN-GANG ZHANG, LI-QIANG ZHENG, YUAN LI, YUN-DI JIAO, and YING-XIAN SUN
- Subjects
OBESITY ,ADOLESCENT obesity ,CHILDHOOD obesity ,OVERWEIGHT persons ,ELECTROCARDIOGRAPHY ,NUTRITION disorders in children ,NUTRITION disorders ,BODY mass index - Abstract
Obesity exhibits a wide variety of electrocardiogram (ECG) abnormalities in adults, which often lead to cardiovascular events. However, there is currently no evidence of an association between obesity and ECG variables in children and adolescents. The present study aimed to explore the associations between obesity and ECG intervals and axes in children and adolescents. A cross-sectional observational study of 5,556 students aged 5-18 years was performed. Anthropometric data, blood pressure and standard 12-lead ECGs were collected for each participant. ECG variables were measured manually based on the temporal alignment of simultaneous 12 leads using a CV200 ECG Work Station. Overweight and obese groups demonstrated significantly longer PR intervals, wider QRS durations and leftward shifts of frontal P-wave, QRS and T-wave axes, while the obese group also demonstrated significantly higher heart rates, compared with normal weight groups within normotensive or hypertensive subjects (P<0.05). Abdominal obesity was also associated with longer PR intervals, wider QRS duration and a leftward shift of frontal ECG axes compared with normal waist circumference (WC) within normotensive or hypertensive subjects (P<0.05). Gender was a possible factor affecting the ECG variables. Furthermore, the ECG variables, including PR interval, QRS duration and frontal P-wave, QRS and T-wave axes, were significantly linearly correlated with body mass index, WC and waist-to-height ratio adjusted for age, gender, ethnicity and blood pressure. However, there was no significant association between obesity and the corrected QT interval (P>0.05). The results of the current study indicate that in children and adolescents, general and abdominal obesity is associated with longer PR intervals, wider QRS duration and a leftward shift of frontal P-wave, QRS and T-wave axes, independent of age, gender, ethnicity and blood pressure. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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61. Integration of Fuzzy Methods into Geostatistics for Petrophysical Property Distribution Simulation of a Reservoir at Exploration Stage
- Author
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Zhanggui, Lian, additional, Di, Jiao, additional, Jun, Fan, additional, Jianchun, Guo, additional, and Kaihong, Zhang, additional
- Published
- 1998
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62. Ratio Balance of Th17 and Treg Cells in Peripheral Blood of Patients with Chronic Lymphocytic Leukemia.
- Author
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TANG Di-Jiao, NIU Qian, ZENG Ting-Ting, JIANG Neng-Gang, JIN Yong-Mei, DING Bin, ZHENG Qin, SHI Qing, CHEN Jiao, YU Jiang, SU Jun, and JIA Yong-Qian
- Published
- 2013
- Full Text
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63. Genetic polymorphisms of 9 non-combined of DNA index system short tandem repeat loci of Chinese Tibetan ethnic minority group in Tibet
- Author
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Song, Xing-bo, MeiLangQuCuo, Tang, Di-jiao, Ren, Ran, Liu, Jia-ming, Hu, Xin, Zhou, Yi, Zhang, Lei, Lu, Xiao-jun, Wang, Jun, Ye, Yuan-xin, Ying, Bin-wu, and Wang, Lan-lan
- Published
- 2011
- Full Text
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64. Th17 response was elevated in the patients with chronic lymphocytic leukemia: a one year follow-up
- Author
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Yong-Qian Jia, Qian Niu, Qin Zheng, Di-jiao Tang, Neng-Gang Jiang, and Jing-jing Li
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One year follow up ,medicine.diagnostic_test ,business.industry ,Chronic lymphocytic leukemia ,FOXP3 ,hemic and immune systems ,chemical and pharmacologic phenomena ,General Medicine ,medicine.disease ,Treg cell ,Peripheral blood ,Peripheral ,Flow cytometry ,hemic and lymphatic diseases ,Immunology ,medicine ,IL-2 receptor ,business - Abstract
UNLABELLED Objective : In this study, we aimed to investigate changes of peripheral Th17 and Treg cells frequencies in the newly-diagnosed Chronic Lymphocytic Leukemia (CLL) patients for 12 months. Methods : In this research, 50 CLL patients were enrolled. Circulating Th1, Th17 cells and CD4+CD25+Foxp3+Treg cells were analyzed by flow cytometry. Plasma levels of related cytokines were detected by enzyme-linked immuno sorbent assay (ELISA). The study was carried out from January 2012 to October 2013 at Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, P.R. China. RESULTS Compared with healthy controls, Th17 cells related cytokines were significantly increased in CLL patients, while Treg cells related cytokines were significantly lowered. In the follow-up, we found that the frequency of Treg cells was irregular, while the frequency of Th17 cells was gradually decreased. CONCLUSION Our study suggested that Th17 cells may play important role in the immune regulation of CLL, and may become a new target in CLL therapy.
- Published
- 1969
65. A Dense Cr2O3/Al2O3 Composite Ceramic Coating Prepared by Electrodeposition and Sealing with Al2O3.
- Author
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Di, Jiao, Liu, Wei, Xue, Lihong, Zhou, Qilai, and Yan, Youwei
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CERAMIC coating ,ELECTROPLATING ,MICROHARDNESS - Abstract
A dense Cr
2 O3 /Al2 O3 composite coating was fabricated on 321L stainless steel by electrodepositing an Al2 O3 layer on a Cr2 O3 coating. The composition, structure, and properties of the obtained ceramic coating were investigated. The results showed that Al2 O3 fully infiltrated the Cr2 O3 coating and significantly improved the compactness of the ceramic coating by filling in the pores and cracks between the Cr2 O3 grains. The composite ceramic coating was heat-treated at 750 °C and exhibited a high microhardness of 219.4 HV500g , a bonding strength of 46.5 MPa, and excellent anti-corrosion and deuterium permeation suppression properties. [ABSTRACT FROM AUTHOR]- Published
- 2019
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66. [Imbalance of Th17 and Treg cells in peripheral blood from multiple myeloma patients].
- Author
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Li JJ, Niu Q, Tang DJ, Jiang NG, Jin YM, Su J, and Jia YQ
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- Adult, Aged, Female, Flow Cytometry, Humans, Lymphocyte Count, Male, Middle Aged, Multiple Myeloma pathology, Multiple Myeloma immunology, T-Lymphocytes, Regulatory cytology, Th17 Cells cytology
- Abstract
Objective: To investigate the ratio of Th17 cells and CD4⁺CD25⁺Foxp3⁺ regulatory T (Treg) cells in peripheral blood from patients with multiple myeloma (MM) and explore its pathological effects., Methods: 70 MM patients were divided into three groups: newly diagnosed group (n=30), plateau stage group (n=23) and relapsed/refractory group (n=17). The controls consisted of 20 healthy donors. The frequencies of Th17 and Treg cells were detected by flow cytometry., Results: Compared with controls [(0.72±0.33)%] and plateau stage group [(0.74±0.29)%], frequencies of Th17 cells were higher in newly diagnosed group [(1.62±0.65)%] and relapsed/refractory group [(1.45±0.51)%], respectively (P<0.05). Compared with controls [(2.33±0.90)%] and plateau stage group [(1.69±0.70)%], frequencies of Treg cells were significantly lower in newly diagnosed group [(0.55±0.23)%] and relapsed/refractory group [(0.82±0.54)%], respectively (P<0.05). The ratios of Th17/Treg in newly diagnosed group and relapsed/refractory group were higher than those in controls (P<0.05). There were no differences of the frequencies of CD3⁺CD4⁺ T cells and Th17 cells between plateau stage group and controls. The frequencies of Treg cells were significantly lower in plateau stage group than that in controls (P<0.05), and the ratio of Th17/Treg was significantly higher in plateau stage group than that in controls (P<0.05)., Conclusion: The remarkable abnormality of T cells subsets was reduction of CD4⁺ T cells in MM. Higher frequency of Th17 and lower ratio of Treg could lead to imbalance of Th17/Treg, which may play a critical role in the pathogenesis of MM.
- Published
- 2013
- Full Text
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67. [Ratio balance of Th17 and Treg cells in peripheral blood of patients with chronic lymphocytic leukemia].
- Author
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Tang DJ, Niu Q, Zeng TT, Jiang NG, Jin YM, Ding B, Zheng Q, Shi Q, Chen J, Yu J, Su J, and Jia YQ
- Subjects
- Aged, Case-Control Studies, Female, Flow Cytometry, Humans, Lymphocyte Count, Male, Middle Aged, Leukemia, Lymphocytic, Chronic, B-Cell pathology, T-Lymphocytes, Regulatory cytology, Th17 Cells cytology
- Abstract
This study was purposed to investigate the ratio of Th17 cells and CD4(+)CD25(+)Foxp3(+) regulatory T (Treg) cells in peripheral blood of patients with chronic lymphocytic leukemia (CLL) and to explore their roles in the pathogenesis and clinical diagnosis. Based on the number of peripheral lymphocytes and treatment condition, the CLL patients were divided into 2 groups: untreated group (n = 30) and remission group (n = 15), the healthy control group (n = 20) was set up as well. The frequencies of Th17 and Treg cells of all cases were detected by flow cytometry (FCM). The results showed that frequencies of CD3(+)CD4(+)T cells and Th17 cells were significantly higher in untreated group than that in healthy control group (P < 0.05), the frequencies of CD3(+)CD8(+)T cells and Treg cells were significantly lower in untreated group than that in healthy control group (P < 0.05), the ratio of Th17/Treg was significantly higher in untreated group than that in healthy control group (P < 0.05). The frequencies of Th17 were not statistically different between remission and healthy control groups, the frequencies of Treg cells were significantly lower in remission group than that in healthy control group (P < 0.05), the ratio of Th17/Treg was significantly higher in remission group than that in healthy control group (P < 0.05), frequencies of Th17 cells were markedly lower in remission group than that in untreated group (P < 0.05). It is concluded that Th17/Treg imbalance exists in patients with CLL, which may play a key role in pathogenesis and development of CLL.
- Published
- 2013
- Full Text
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68. [Analysis of clinical characteristics and JAK2V617F mutation of Tibetan people living at high altitudes with polycythemia].
- Author
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Tang DJ, Ye YX, and Li J
- Subjects
- Adult, Asian People genetics, Female, Humans, Male, Middle Aged, Mutation, Polycythemia diagnosis, Altitude, Janus Kinase 2 genetics, Polycythemia ethnology, Polycythemia genetics
- Published
- 2012
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