Jadeite jade,also called Feicui in China,is the most popular jade variety and one of the best selling gems in China.Colour and transparency are the primary quality factors that determine the value of Feicui.Jadeite ja...Jadeite jade,also called Feicui in China,is the most popular jade variety and one of the best selling gems in China.Colour and transparency are the primary quality factors that determine the value of Feicui.Jadeite jade is a polycrystalline aggregate,primarily consisting of jadeite(NaAlSi2O6) and including accessory minerals such as omphacite,albite,amphibole,and chromite[1-2].Gem-quality Feicui material is only found in a few countries,namely Myanmar,Guatemala,Russia,Kazakhstan,and Japan[3-5].Myanmar is the traditional and most important producer of gem-quality jadeite jade,while Guatemala has become the second-largest producer[6]. "Ice jade" is a translucent variety of jadeite jade(also known as Feicui) that is generally of high value.Reportedly from the Morales mine in the Izabal Department of Guatemala,it has recently appeared in the Chinese jewelry market.In this study,the structural characteristics,mineral compositions,and colour genesis of Guatemalan "ice jade" were studied using UV-Vis-NIR and Raman spectroscopy,X-ray diffraction,electron probe microanalysis,scanning electron microscopy,and cathodoluminescence. "Ice jade" from the Morales mine in Guatemala is composed of almost pure jadeite,containing very small amounts of accessory minerals,including omphacite and albite.The omphacite grains are often nearly colourless and not easily observed,while the albite grains cluster as white snowflake-like inclusions or dispersed as small specks.The "ice jade" exhibits a fine-grained structure,occasionally coexisting with a micro-granular structure.The relatively pure chemical compositions of sodium pyroxene accompany with a fine texture produced a transparent to semi-transparent and near-colourless appearance.A small amount of dispersed fine-grained omphacite is considered the cause of the pale green colour in "ice jade" from Guatemala.The Guatemalan origin can be determined from its characteristic appearance,microstructure,accessory minerals,and chemical compositions.展开更多
Objective： To investigate the distribution of TRPA1 （one kind of the TRP-like ion channel family） channel in the hippocampus and cerebral cortex of rat. Methods： RT-PCR was used to amplify the fragment of TRPA1 in...Objective： To investigate the distribution of TRPA1 （one kind of the TRP-like ion channel family） channel in the hippocampus and cerebral cortex of rat. Methods： RT-PCR was used to amplify the fragment of TRPA1 in the DRG （dorsal root ganglion）, hippocampus and cerebral cortex of adult SD rat. In situ hybridization staining was used to show the distribution of TRPA1 mRNA in the hippocampus and cerebral cortex of adult rat brain. Results： Both RT-PCR and in situ hybridization staining showed that TRPA1 mRNA was expressed in hippocampus and cerebral cortex of the adult rat brain. Conclusion： Our results suggest that there is expression of TRPA1 mRNA both in the hippocampus and cerebral cortex of the adult rat brain.展开更多
Objective： Lymphangioma is a benign tumor representing a congenital malformation of the lymphatic channels. The cavernous lymphangioma of the bladder did not report before. Here we report 1 case of cavernous lymphang...Objective： Lymphangioma is a benign tumor representing a congenital malformation of the lymphatic channels. The cavernous lymphangioma of the bladder did not report before. Here we report 1 case of cavernous lymphangioma of the bladder in an adult female and review the literature in order to accumulate the experience of diagnosis and treatment for these diseases. Methods： In our case a 50-year-old woman presented with irritative voiding symptoms and had painless macroscopic hematuria at times. Cystoscopy showed a non-papillary tumor at apex vesicae and mucous membrane hyperaemia between the two orifices within the trigone. The pathologic diagnosis was cystitis glandularis with hyperplasia of urothelium and cavernous lymphangioma in lamina propria. Transurethral resection was performed and then bleomycin A5 was injected into lesion multipoint applying ureteral catheter with puncture needle. Results： Two months after operation the irritative voiding symptoms improved and the urine analysis was normal. Cystoscopy showed no residual tumor. Bleomycin A5 was injected into the lesion area again just like the operation before. All symptoms disappeared completely when the patient was examined a month later. There was no side effect after injection and no recurrence during the follow-up of 1 year. Conclusion： Lymphangioma of the bladder can be diagnosed exactly by cystoscopy and pathological examination. Surgery may be the best treatment. The bleomycin A5 intralesional sclerosant is also an effective therapy for the disease after surgical removal.展开更多
Electrochemical impedance spectroscopy(EIS)is a well-established non-destructive characterization technique for assessing the efficacy of electrochemical energy storage and conversion systems.Electrocatalytic systems ...Electrochemical impedance spectroscopy(EIS)is a well-established non-destructive characterization technique for assessing the efficacy of electrochemical energy storage and conversion systems.Electrocatalytic systems based on proton exchange membrane(PEM),including PEM fuel cells and PEM water electrolyzers,play a crucial role in renewable energy conversion through electricity–hydrogen interconversion.EIS,along with its derived analysis methods—equivalent circuit model(ECM),distribution of relaxation time(DRT),and dynamic EIS(DEIS),is widely utilized to extract valuable kinetics and impedance data.The acquired information affords critical insights into processes such as mass transfer,charge transfer,and proton transfer within PEM systems.This mini review surveys the role of EIS in optimizing components and investigating operational conditions to enhance the efficiency of PEM systems.In addition,it encapsulates the principles and applications of EIS-based methods like DRT and DEIS,highlighting their potential in the practical application of PEM systems.展开更多
文摘Jadeite jade,also called Feicui in China,is the most popular jade variety and one of the best selling gems in China.Colour and transparency are the primary quality factors that determine the value of Feicui.Jadeite jade is a polycrystalline aggregate,primarily consisting of jadeite(NaAlSi2O6) and including accessory minerals such as omphacite,albite,amphibole,and chromite[1-2].Gem-quality Feicui material is only found in a few countries,namely Myanmar,Guatemala,Russia,Kazakhstan,and Japan[3-5].Myanmar is the traditional and most important producer of gem-quality jadeite jade,while Guatemala has become the second-largest producer[6]. "Ice jade" is a translucent variety of jadeite jade(also known as Feicui) that is generally of high value.Reportedly from the Morales mine in the Izabal Department of Guatemala,it has recently appeared in the Chinese jewelry market.In this study,the structural characteristics,mineral compositions,and colour genesis of Guatemalan "ice jade" were studied using UV-Vis-NIR and Raman spectroscopy,X-ray diffraction,electron probe microanalysis,scanning electron microscopy,and cathodoluminescence. "Ice jade" from the Morales mine in Guatemala is composed of almost pure jadeite,containing very small amounts of accessory minerals,including omphacite and albite.The omphacite grains are often nearly colourless and not easily observed,while the albite grains cluster as white snowflake-like inclusions or dispersed as small specks.The "ice jade" exhibits a fine-grained structure,occasionally coexisting with a micro-granular structure.The relatively pure chemical compositions of sodium pyroxene accompany with a fine texture produced a transparent to semi-transparent and near-colourless appearance.A small amount of dispersed fine-grained omphacite is considered the cause of the pale green colour in "ice jade" from Guatemala.The Guatemalan origin can be determined from its characteristic appearance,microstructure,accessory minerals,and chemical compositions.
基金Major Project of National Scientific Foundation Committee(NSFC30230140,30400142) and Program for New Century Excel-lent Talentsin University(NCET-04-0695)
文摘Objective： To investigate the distribution of TRPA1 （one kind of the TRP-like ion channel family） channel in the hippocampus and cerebral cortex of rat. Methods： RT-PCR was used to amplify the fragment of TRPA1 in the DRG （dorsal root ganglion）, hippocampus and cerebral cortex of adult SD rat. In situ hybridization staining was used to show the distribution of TRPA1 mRNA in the hippocampus and cerebral cortex of adult rat brain. Results： Both RT-PCR and in situ hybridization staining showed that TRPA1 mRNA was expressed in hippocampus and cerebral cortex of the adult rat brain. Conclusion： Our results suggest that there is expression of TRPA1 mRNA both in the hippocampus and cerebral cortex of the adult rat brain.
文摘Objective： Lymphangioma is a benign tumor representing a congenital malformation of the lymphatic channels. The cavernous lymphangioma of the bladder did not report before. Here we report 1 case of cavernous lymphangioma of the bladder in an adult female and review the literature in order to accumulate the experience of diagnosis and treatment for these diseases. Methods： In our case a 50-year-old woman presented with irritative voiding symptoms and had painless macroscopic hematuria at times. Cystoscopy showed a non-papillary tumor at apex vesicae and mucous membrane hyperaemia between the two orifices within the trigone. The pathologic diagnosis was cystitis glandularis with hyperplasia of urothelium and cavernous lymphangioma in lamina propria. Transurethral resection was performed and then bleomycin A5 was injected into lesion multipoint applying ureteral catheter with puncture needle. Results： Two months after operation the irritative voiding symptoms improved and the urine analysis was normal. Cystoscopy showed no residual tumor. Bleomycin A5 was injected into the lesion area again just like the operation before. All symptoms disappeared completely when the patient was examined a month later. There was no side effect after injection and no recurrence during the follow-up of 1 year. Conclusion： Lymphangioma of the bladder can be diagnosed exactly by cystoscopy and pathological examination. Surgery may be the best treatment. The bleomycin A5 intralesional sclerosant is also an effective therapy for the disease after surgical removal.
基金supported by the National Key R&D Program of China(2022YFB2404402)the State Grid Headquarter Science and Technology Project(5419-202399650A-3-2-ZN)+4 种基金S&T Program of Hebei(22344402D)National Natural Science Foundation of China(T2322015,22393900,and 22109086)the Beijing Natural Science Foundation(L233004)the Seed Fund of Shanxi Research Institute for Clean Energythe Tsinghua University Initiative Scientific Research Program。
文摘Electrochemical impedance spectroscopy(EIS)is a well-established non-destructive characterization technique for assessing the efficacy of electrochemical energy storage and conversion systems.Electrocatalytic systems based on proton exchange membrane(PEM),including PEM fuel cells and PEM water electrolyzers,play a crucial role in renewable energy conversion through electricity–hydrogen interconversion.EIS,along with its derived analysis methods—equivalent circuit model(ECM),distribution of relaxation time(DRT),and dynamic EIS(DEIS),is widely utilized to extract valuable kinetics and impedance data.The acquired information affords critical insights into processes such as mass transfer,charge transfer,and proton transfer within PEM systems.This mini review surveys the role of EIS in optimizing components and investigating operational conditions to enhance the efficiency of PEM systems.In addition,it encapsulates the principles and applications of EIS-based methods like DRT and DEIS,highlighting their potential in the practical application of PEM systems.
