The present study was designed to determine the chemical constituents of the stems and hooks of Uncaria rhynchophylla. The chemical constituents were isolated and purified from CH_2Cl_2 fraction by chromatography. The...The present study was designed to determine the chemical constituents of the stems and hooks of Uncaria rhynchophylla. The chemical constituents were isolated and purified from CH_2Cl_2 fraction by chromatography. Their structures were elucidated by spectroscopic analyses. Their cytotoxicity was tested using MTT method. Two new ortho benzoquinones, 3-diethylamino-5-methoxy-1, 2-benzoquinone(1) and 3-ethylamino-5-methoxy-1, 2-benzoquinone(2), together with a known compound isorhynchophyllic acid(3) were isolated from U. rhynchophylla. These compounds were evaluated for their cytotoxicity against cancer cells A549, Hep G2 and A2780. Compounds 1 and 2 were new ortho benzoquinones and showed weak antiproliferative activities on A549, Hep G2 and A2780 cells. Compound 3 significantly inhibited the proliferation of A549, Hep G2 and A2780 cells with IC_(50) values being 5.8, 12.8 and 11.8 μmol·L^(–1), respectively.展开更多
目的本研究目的在于评估Ortho One PROMT评分在预测半月板撕裂可修复性方面的准确性,检验其是否具备解决术前半月板手术方式预测困难的能力。方法纳入本院2019年3月至2019年12月因半月板损伤而接受关节镜下手术者55膝58侧半月板。本研...目的本研究目的在于评估Ortho One PROMT评分在预测半月板撕裂可修复性方面的准确性,检验其是否具备解决术前半月板手术方式预测困难的能力。方法纳入本院2019年3月至2019年12月因半月板损伤而接受关节镜下手术者55膝58侧半月板。本研究分为两个部分。第一部分:评分过程由两位医生按Ortho One PROMT评分细则分别对半月板损伤者进行独立评分,并根据得分预测半月板手术术式。第二部分:将两位评分医生预测的半月板手术术式分别与手术医生的实际手术术式进行一致性比较,最终评价Ortho One PROMT评分在预测半月板撕裂可修复性方面的准确性、敏感度及特异度。结果评分医生预测半月板修复的平均正确率为86.9%,平均敏感度为86.9%,平均特异度为87.5%,平均阳性预测值92.9%,平均阴性预测值为77.9%;预测半月板切除的平均正确率为87.5%,平均敏感度为87.5%,平均特异度为86.9%,平均阳性预测值为77.9%,平均阴性预测值为92.9%。两位评分医生的预测结果与手术医生的实际术式高度一致(k=0.78,k=0.67)。结论Ortho One PROMT评分预测半月板撕裂可修复性不仅简便、可操作性强,而且具有良好的准确性、敏感度和特异度,能够有效解决当前术前半月板手术方式预测困难的问题,具有一定的临床应用推广价值。展开更多
In dentistry,orthodontic root resorption is a long-lasting issue with no effective treatment strategy,and its mechanisms,especially those related to senescent cells,remain largely unknown.Here,we used an orthodontic i...In dentistry,orthodontic root resorption is a long-lasting issue with no effective treatment strategy,and its mechanisms,especially those related to senescent cells,remain largely unknown.Here,we used an orthodontic intrusion tooth movement model with an L-loop in rats to demonstrate that mechanical stress-induced senescent cells aggravate apical root resorption,which was prevented by administering senolytics(a dasatinib and quercetin cocktail).展开更多
The possible features of photo acoustic tomography (PAT) in medical research and practice, including applications in orthopedics and cardiovascular areas, among others, have motivated the emphasis of this study toward...The possible features of photo acoustic tomography (PAT) in medical research and practice, including applications in orthopedics and cardiovascular areas, among others, have motivated the emphasis of this study towards human bone applications. PAT modality is an emerging approach that features safety and greater penetration depth compared to other modalities such as X-ray and microwave. The high-resolution images and safety related to PAT modality are attributed to the scattering properties of ultrasound as compared to light within a human tissue. PAT brought considerable attention from the medical research community to target optimum parameters for practical models. It includes source frequency penetration depth, dynamic temperature responses, and acoustic pressure throughout the multilayer structure of the human tissues. In this work, the acoustic pressure and the bio-heat equations were analyzed for power distribution and penetration depth, covering the basic principles of PAT within the human body. Three sources with three dif-ferent heat energy pulses;1 s, 3 s, and 5 s, were considered in order to study the rise time and fall time dynamic responses inside the bone material. The computer simulation was designed to simu-late the human tissue at 1 MHz with an acoustic pressure of 1 MPa. A penetration depth for all sources was estimated to be near 4 cm with a temperature change from 0.5 K to near 1 K over a pe-riod of 10 s. The simulation data provide promising results when taken to the next level of practical implementation. The 4 cm penetration depth range may enable the researchers to investigate mul-tiple layers within the human body, leading to non-invasive deterministic approach. The simulation presented here will serve as a pilot study towards photoacoustic applications in orthopedic applica-tions.展开更多
A simple, cost effective and rapid electrochemical method has been developed for the determination of micro level ortho nitrobenzaldehyde(ONB) based on outstanding properties of modified aluminum electrode tin nanor...A simple, cost effective and rapid electrochemical method has been developed for the determination of micro level ortho nitrobenzaldehyde(ONB) based on outstanding properties of modified aluminum electrode tin nanorods/anodic aluminum oxide/aluminum(SnNR/AAO/Al) for the first time. The SnNR/AAO/Al electrode was fabricated by a second step anodization, followed by electrodeposition and its electrochemical behavior was investigated in detail. The cyclic voltammetry results indicated that the SnNR/AAO/Al electrode exhibited efficient electrocatalytic activity toward reduction of ONB in the acidic solution. It provides an appreciable improvement of reduction peak for ONB at-0.721 V.Furthermore, various kinetic parameters such as transfer electron number, transfer proton number and standard heterogeneous rate constant were calculated from the scan rates.The electrocatalytic behavior was further exploited as a sensitive detection scheme for the ONB determination by differential pulse voltammetry. Under the optimized conditions, the concentration range and detection limit are 0.1-100 μmol/L and 0.05 μmol/L, respectively,for ONB. The analytical performance of this modified sensor has been evaluated for detection of real sample such as river water and recovery of ONB was achieved all-out up to102.3% under standard addition method.展开更多
Neimadian-point is a newly-found acupointwith a good analgesic effect. 306 orthopedic op-erations on extremities were underNeimadian-point acupuncture anesthesia withgood results. 198 cases with complete clinicalmate...Neimadian-point is a newly-found acupointwith a good analgesic effect. 306 orthopedic op-erations on extremities were underNeimadian-point acupuncture anesthesia withgood results. 198 cases with complete clinicalmaterials were selected and analyzed in the pa-per.展开更多
The molecular structures of the products of the cyanation of 2,6-bromo-4-nitro-4′-(N,N-diethy1)-azo dye withCuCN were analyzed and identified.Mechanism of the formation of the by-products was also discussed.
AIM: To establish a more stable and accurate nude mouse model of pancreatic cancer using cancer cell microencapsulation. METHODS: The assay is based on microencapsulation technology, wherein human tumor cells are enca...AIM: To establish a more stable and accurate nude mouse model of pancreatic cancer using cancer cell microencapsulation. METHODS: The assay is based on microencapsulation technology, wherein human tumor cells are encapsulated in small microcapsules (approximately 420 μm in diameter) constructed of semipermeable membranes. We implemented two kinds of subcutaneous implantation models in nude mice using the injection of single tumor cells and encapsulated pancreatic tumor cells. The size of subcutaneously implanted tumors was observed ona weekly basis using two methods, and growth curves were generated from these data. The growth and metastasis of orthotopically injected single tumor cells and encapsulated pancreatic tumor cells were evaluated at four and eight weeks postimplantation by positron emission tomography-computed tomography scan and necropsy. The pancreatic tumor samples obtained from each method were then sent for pathological examination. We evaluated differences in the rates of tumor incidence and the presence of metastasis and variations in tumor volume and tumor weight in the cancer microcapsules vs single-cell suspensions. RESULTS: Sequential in vitro observations of the microcapsules showed that the cancer cells in microcapsules proliferated well and formed spheroids at days 4 to 6. Further in vitro culture resulted in bursting of the membrane of the microcapsules and cells deviated outward and continued to grow in flasks. The optimum injection time was found to be 5 d after tumor encapsulation. In the subcutaneous implantation model, there were no significant differences in terms of tumor volume between the encapsulated pancreatic tumor cells and cells alone and rate of tumor incidence. There was a significant difference in the rate of successful im- plantation between the cancer cell microencapsulation group and the single tumor-cell suspension group (100% vs 71.43%, respectively, P = 0.0489) in the orthotropic implantation model. The former method displayed an obvious advantage in tumor mass (4展开更多
The mesomorphie properties of title complexes are investigated by means of DSC and polarizing microscopy. The mesophase temperature ranges of complexes are wider than that of corresponding organic ligands. The bridgin...The mesomorphie properties of title complexes are investigated by means of DSC and polarizing microscopy. The mesophase temperature ranges of complexes are wider than that of corresponding organic ligands. The bridging groups of the complexes have profoand effects on the mesomorphic behavior, When the bridging groups are opticallhy active. the compleve show chiral smectic展开更多
A general formula of the fourth transitional metals (η5-C5H5)2M(σ-Ar)2, where M = Ti(Ⅳ), Zr(Ⅳ), Hf(Ⅳ), was assigned for his (cyclopentadienyl) bis (aryl)metal. In this formula Ar=pheny pentafluoroph...A general formula of the fourth transitional metals (η5-C5H5)2M(σ-Ar)2, where M = Ti(Ⅳ), Zr(Ⅳ), Hf(Ⅳ), was assigned for his (cyclopentadienyl) bis (aryl)metal. In this formula Ar=pheny pentafluorophenyl p-tolyl, m-tolyl have been reported. In a previous communication we have also reported the synthesis of ortho substituted tolyl derivatives of zirconium and hafnium of展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.81373956 and 81274064)the Priority Academic Program Development of Jiangsu Higher Education Institutions
文摘The present study was designed to determine the chemical constituents of the stems and hooks of Uncaria rhynchophylla. The chemical constituents were isolated and purified from CH_2Cl_2 fraction by chromatography. Their structures were elucidated by spectroscopic analyses. Their cytotoxicity was tested using MTT method. Two new ortho benzoquinones, 3-diethylamino-5-methoxy-1, 2-benzoquinone(1) and 3-ethylamino-5-methoxy-1, 2-benzoquinone(2), together with a known compound isorhynchophyllic acid(3) were isolated from U. rhynchophylla. These compounds were evaluated for their cytotoxicity against cancer cells A549, Hep G2 and A2780. Compounds 1 and 2 were new ortho benzoquinones and showed weak antiproliferative activities on A549, Hep G2 and A2780 cells. Compound 3 significantly inhibited the proliferation of A549, Hep G2 and A2780 cells with IC_(50) values being 5.8, 12.8 and 11.8 μmol·L^(–1), respectively.
文摘目的本研究目的在于评估Ortho One PROMT评分在预测半月板撕裂可修复性方面的准确性,检验其是否具备解决术前半月板手术方式预测困难的能力。方法纳入本院2019年3月至2019年12月因半月板损伤而接受关节镜下手术者55膝58侧半月板。本研究分为两个部分。第一部分:评分过程由两位医生按Ortho One PROMT评分细则分别对半月板损伤者进行独立评分,并根据得分预测半月板手术术式。第二部分:将两位评分医生预测的半月板手术术式分别与手术医生的实际手术术式进行一致性比较,最终评价Ortho One PROMT评分在预测半月板撕裂可修复性方面的准确性、敏感度及特异度。结果评分医生预测半月板修复的平均正确率为86.9%,平均敏感度为86.9%,平均特异度为87.5%,平均阳性预测值92.9%,平均阴性预测值为77.9%;预测半月板切除的平均正确率为87.5%,平均敏感度为87.5%,平均特异度为86.9%,平均阳性预测值为77.9%,平均阴性预测值为92.9%。两位评分医生的预测结果与手术医生的实际术式高度一致(k=0.78,k=0.67)。结论Ortho One PROMT评分预测半月板撕裂可修复性不仅简便、可操作性强,而且具有良好的准确性、敏感度和特异度,能够有效解决当前术前半月板手术方式预测困难的问题,具有一定的临床应用推广价值。
基金supported by JST,CREST Grant Number JPMJCR22L5,Japan。
文摘In dentistry,orthodontic root resorption is a long-lasting issue with no effective treatment strategy,and its mechanisms,especially those related to senescent cells,remain largely unknown.Here,we used an orthodontic intrusion tooth movement model with an L-loop in rats to demonstrate that mechanical stress-induced senescent cells aggravate apical root resorption,which was prevented by administering senolytics(a dasatinib and quercetin cocktail).
文摘The possible features of photo acoustic tomography (PAT) in medical research and practice, including applications in orthopedics and cardiovascular areas, among others, have motivated the emphasis of this study towards human bone applications. PAT modality is an emerging approach that features safety and greater penetration depth compared to other modalities such as X-ray and microwave. The high-resolution images and safety related to PAT modality are attributed to the scattering properties of ultrasound as compared to light within a human tissue. PAT brought considerable attention from the medical research community to target optimum parameters for practical models. It includes source frequency penetration depth, dynamic temperature responses, and acoustic pressure throughout the multilayer structure of the human tissues. In this work, the acoustic pressure and the bio-heat equations were analyzed for power distribution and penetration depth, covering the basic principles of PAT within the human body. Three sources with three dif-ferent heat energy pulses;1 s, 3 s, and 5 s, were considered in order to study the rise time and fall time dynamic responses inside the bone material. The computer simulation was designed to simu-late the human tissue at 1 MHz with an acoustic pressure of 1 MPa. A penetration depth for all sources was estimated to be near 4 cm with a temperature change from 0.5 K to near 1 K over a pe-riod of 10 s. The simulation data provide promising results when taken to the next level of practical implementation. The 4 cm penetration depth range may enable the researchers to investigate mul-tiple layers within the human body, leading to non-invasive deterministic approach. The simulation presented here will serve as a pilot study towards photoacoustic applications in orthopedic applica-tions.
基金CSIR (09/0810 (0021)/ 2012-EMR-I), Periyar University for providing fundUGC networking resource center for providing visiting fellowship
文摘A simple, cost effective and rapid electrochemical method has been developed for the determination of micro level ortho nitrobenzaldehyde(ONB) based on outstanding properties of modified aluminum electrode tin nanorods/anodic aluminum oxide/aluminum(SnNR/AAO/Al) for the first time. The SnNR/AAO/Al electrode was fabricated by a second step anodization, followed by electrodeposition and its electrochemical behavior was investigated in detail. The cyclic voltammetry results indicated that the SnNR/AAO/Al electrode exhibited efficient electrocatalytic activity toward reduction of ONB in the acidic solution. It provides an appreciable improvement of reduction peak for ONB at-0.721 V.Furthermore, various kinetic parameters such as transfer electron number, transfer proton number and standard heterogeneous rate constant were calculated from the scan rates.The electrocatalytic behavior was further exploited as a sensitive detection scheme for the ONB determination by differential pulse voltammetry. Under the optimized conditions, the concentration range and detection limit are 0.1-100 μmol/L and 0.05 μmol/L, respectively,for ONB. The analytical performance of this modified sensor has been evaluated for detection of real sample such as river water and recovery of ONB was achieved all-out up to102.3% under standard addition method.
文摘Neimadian-point is a newly-found acupointwith a good analgesic effect. 306 orthopedic op-erations on extremities were underNeimadian-point acupuncture anesthesia withgood results. 198 cases with complete clinicalmaterials were selected and analyzed in the pa-per.
文摘The molecular structures of the products of the cyanation of 2,6-bromo-4-nitro-4′-(N,N-diethy1)-azo dye withCuCN were analyzed and identified.Mechanism of the formation of the by-products was also discussed.
基金Supported by The Science and Technology Commission Foundation of Shanghai, No. 09140902300the Municipal Education Commission Foundation of Shanghai, No. 09YZ84
文摘AIM: To establish a more stable and accurate nude mouse model of pancreatic cancer using cancer cell microencapsulation. METHODS: The assay is based on microencapsulation technology, wherein human tumor cells are encapsulated in small microcapsules (approximately 420 μm in diameter) constructed of semipermeable membranes. We implemented two kinds of subcutaneous implantation models in nude mice using the injection of single tumor cells and encapsulated pancreatic tumor cells. The size of subcutaneously implanted tumors was observed ona weekly basis using two methods, and growth curves were generated from these data. The growth and metastasis of orthotopically injected single tumor cells and encapsulated pancreatic tumor cells were evaluated at four and eight weeks postimplantation by positron emission tomography-computed tomography scan and necropsy. The pancreatic tumor samples obtained from each method were then sent for pathological examination. We evaluated differences in the rates of tumor incidence and the presence of metastasis and variations in tumor volume and tumor weight in the cancer microcapsules vs single-cell suspensions. RESULTS: Sequential in vitro observations of the microcapsules showed that the cancer cells in microcapsules proliferated well and formed spheroids at days 4 to 6. Further in vitro culture resulted in bursting of the membrane of the microcapsules and cells deviated outward and continued to grow in flasks. The optimum injection time was found to be 5 d after tumor encapsulation. In the subcutaneous implantation model, there were no significant differences in terms of tumor volume between the encapsulated pancreatic tumor cells and cells alone and rate of tumor incidence. There was a significant difference in the rate of successful im- plantation between the cancer cell microencapsulation group and the single tumor-cell suspension group (100% vs 71.43%, respectively, P = 0.0489) in the orthotropic implantation model. The former method displayed an obvious advantage in tumor mass (4
文摘The mesomorphie properties of title complexes are investigated by means of DSC and polarizing microscopy. The mesophase temperature ranges of complexes are wider than that of corresponding organic ligands. The bridging groups of the complexes have profoand effects on the mesomorphic behavior, When the bridging groups are opticallhy active. the compleve show chiral smectic
文摘A general formula of the fourth transitional metals (η5-C5H5)2M(σ-Ar)2, where M = Ti(Ⅳ), Zr(Ⅳ), Hf(Ⅳ), was assigned for his (cyclopentadienyl) bis (aryl)metal. In this formula Ar=pheny pentafluorophenyl p-tolyl, m-tolyl have been reported. In a previous communication we have also reported the synthesis of ortho substituted tolyl derivatives of zirconium and hafnium of