To develop well defined in vitro cell system to test cytotoxicity of a number of model toxins, genetically engineered V79 Chinese hamster fibroblasts expressing isoenzymes of cytochrome P4501A1 XEM2 cells and V79 ce...To develop well defined in vitro cell system to test cytotoxicity of a number of model toxins, genetically engineered V79 Chinese hamster fibroblasts expressing isoenzymes of cytochrome P4501A1 XEM2 cells and V79 cells (parental), which lack cytochrome P450 enzyme activities, were used as controls. The cytotoxic effect of trans 7,8 dihydrbenzo(a)pyrene (BP 7,8 diol) on the parental cells V79 and V79 derived XEM2 cells were evaluated by two methods for cell viability. The data obtained expressed that BP 7,8 diol ranging from 1.0 μmol·L 1 to 5.0 μmol·L 1 in concentrations incubated for 24 h showed a strong cytotoxic effect in XEM2 cells (expressing rat cytochrome P4501A1) in a concentration dependent manner. Time dependent decrease for survival of XEM2 cells was also observed at 2.5 μmol·L 1 concentration. Likewise, BP 7,8 diol did not alter the survival of the parental cells V79 under the same condition. This study also showed that α naphthoflavone (αNF), a well known inhibitor of cytochrome P4501A1 might alter BP 7,8 diol induced cytotoxicity in the XEM2 cells. Our results suggested that cytochrome P4501A1 is responsible for BP 7, 8 diol induced cytotoxicity.展开更多
4-（Methylnitrosamino）-1-（3-pyridyl）-1-butanone （NNK） is a potent and prevalent nitrosamine procarcinogen found in cigarette smoke. The aim of this work is to study alterations in peroxiredoxin （Prx） expression...4-（Methylnitrosamino）-1-（3-pyridyl）-1-butanone （NNK） is a potent and prevalent nitrosamine procarcinogen found in cigarette smoke. The aim of this work is to study alterations in peroxiredoxin （Prx） expression induced by NNK during carcinogenesis. Characterization of Prx genes from hamster was performed using bioinformatics.展开更多
The development of kesterite photovoltaic solar cells has been hindered by large open-circuit voltage(V_(oc))deficit.Recently,Snzn deep point defect and associative defect cluster have been recognized as the main culp...The development of kesterite photovoltaic solar cells has been hindered by large open-circuit voltage(V_(oc))deficit.Recently,Snzn deep point defect and associative defect cluster have been recognized as the main culprit for the Voc losses.Therefore,manipulating the deep-level donor of Snzn antisite defects is crucial for breaking through the bottleneck of present Cu_(2) ZnSn(S,Se)_(4)(CZTSSe)photovoltaic technology.In this study,the Snzn deep traps in CZTSSe absorber layer are suppressed by incorporation of Ge.The energy levels and concentration of Snzn defects measured by deep-level transient spectroscopy(DLTS)decrease significantly.In addition,the grain growth of CZTSSe films is also promoted due to Ge implantation,yielding the high quality absorber layer.Consequently,the efficiency of CZTSSe solar cells increases from 9.15%to 11.48%,largely attributed to the 41 mV Voc increment.展开更多
The passivation of non-radiative states and inhibition of band tailings are desirable for improving the open-circuit voltage(V_(oc))of CZTSSe thin-film solar cells.Recently,alkali metal doping has been investigated to...The passivation of non-radiative states and inhibition of band tailings are desirable for improving the open-circuit voltage(V_(oc))of CZTSSe thin-film solar cells.Recently,alkali metal doping has been investigated to passivate defects in CZTSSe films.Herein,we investigate Li doping effects by applying Li OH into CZTSSe precursor solutions,and verify that carrier transport is enhanced in the CZTSSe solar cells.Systematic characterizations demonstrate that Li doping can effectively passivate non-radiative recombination centers and reduce band tailings of the CZTSSe films,leading to the decrease in total defect density and the increase in separation distance between donor and acceptor.Fewer free carriers are trapped in the band tail states,which speeds up carrier transport and reduces the probability of deep-level defects capturing carriers.The charge recombination lifetime is about twice as long as that of the undoped CZTSSe device,implying the heterojunction interface recombination is also inhibited.Besides,Li doping can increase carrier concentration and enhance build-in voltage,leading to a better carrier collection.By adjusting the Li/(Li+Cu)ratio to 18%,the solar cell efficiency is increased significantly to 9.68%with the fill factor(FF)of 65.94%,which is the highest FF reported so far for the flexible CZTSSe solar cells.The increased efficiency is mainly attributed to the reduction of V_(oc)deficit and the improved CZTSSe/Cd S junction quality.These results open up a simple route to passivate non-radiative states and reduce the band tailings of the CZTSSe films and improve the efficiency of the flexible CZTSSe solar cells.展开更多
Patients with Graves’ disease (GD) have marked lymphocytic infiltration in their thyroid glands We examined the gene for the variable regions of the α chain of the Chinese T cell rece...Patients with Graves’ disease (GD) have marked lymphocytic infiltration in their thyroid glands We examined the gene for the variable regions of the α chain of the Chinese T cell receptor(V α gene) in intrathyroidal T cells to determine the role of T cells in the pathogenesis of GD and offer potential for the development of immunotherapeutic remedies for GD Methods. We used the reverse transcription and polymerase chain reaction(RT PCR) to amplify complementary DNA(cDNA) for the 18 known families of the V α gene in intrathyroidal T cells from 5 patients with Graves’ disease The findings were compared with the results of peripheral blood T cells in the same patients as well as those in normal subjects Results. We found that marked restriction in the expression of T cell receptor V α genes by T cells from the thyroid tissue of Chinese patients with GD(P<0 001) An average of only 4 6±1 52 of the 18 V α genes were expressed in such samples, as compared with 10 4±2 30V α genes expressed in peripheral blood T cells from the same patients The pattern of expressed V α genes differed from patient to patient with no clear predominance Conclusions. Expression of intrathyroidal T cell receptor V α genes in GD is highly restricted suggesting the primacy of T cells in causing the disorders展开更多
BACKGROUNDOver the past 20 years,we have gained a deep understanding of the biologicalheterogeneity of diffuse large B cell lymphoma(DLBCL)and have developed arange of new treatment programs based on the characteristi...BACKGROUNDOver the past 20 years,we have gained a deep understanding of the biologicalheterogeneity of diffuse large B cell lymphoma(DLBCL)and have developed arange of new treatment programs based on the characteristics of the disease,bringing us to the era of immune-chemotherapy.However,the effectiveness andmolecular mechanisms of targeted-immunotherapy remain unclear in DLBCL.Targeted-immunotherapy may be beneficial for specific subgroups of patients,thus requiring biomarker assessment.CASE SUMMARYHere,we report a case of MCD subtype DLBCL with MYD88L265P and CD79Bmutations,considered in the initial stage as lymphoplasmic lymphoma(LPL)orWaldenstrom macroglobulinemia(WM).Flow cytometry supported this view;however,the immunohistochemical results of the lymph nodes overturned theabove diagnosis,and the patient was eventually diagnosed with MCD subtypeDLBCL.The presence of a monoclonal IgM component in the serum and infiltrationof small lymphocytes with a phenotype compatible with WM into the bonemarrow led us to propose a hypothesis that the case we report may have transformedfrom LPL/WM.CONCLUSIONThis highlights the possible transformation from WM to DLBCL,CD79B mutationmay be a potential biomarker for predicting this conversion.展开更多
文摘To develop well defined in vitro cell system to test cytotoxicity of a number of model toxins, genetically engineered V79 Chinese hamster fibroblasts expressing isoenzymes of cytochrome P4501A1 XEM2 cells and V79 cells (parental), which lack cytochrome P450 enzyme activities, were used as controls. The cytotoxic effect of trans 7,8 dihydrbenzo(a)pyrene (BP 7,8 diol) on the parental cells V79 and V79 derived XEM2 cells were evaluated by two methods for cell viability. The data obtained expressed that BP 7,8 diol ranging from 1.0 μmol·L 1 to 5.0 μmol·L 1 in concentrations incubated for 24 h showed a strong cytotoxic effect in XEM2 cells (expressing rat cytochrome P4501A1) in a concentration dependent manner. Time dependent decrease for survival of XEM2 cells was also observed at 2.5 μmol·L 1 concentration. Likewise, BP 7,8 diol did not alter the survival of the parental cells V79 under the same condition. This study also showed that α naphthoflavone (αNF), a well known inhibitor of cytochrome P4501A1 might alter BP 7,8 diol induced cytotoxicity in the XEM2 cells. Our results suggested that cytochrome P4501A1 is responsible for BP 7, 8 diol induced cytotoxicity.
基金supported by Doctor Foundation of Zhengzhou University of Light IndustryScientific and technological research projects in Zhengzhou City(141PPTGG399)Scientific and technological research projects in Henan province
文摘4-（Methylnitrosamino）-1-（3-pyridyl）-1-butanone （NNK） is a potent and prevalent nitrosamine procarcinogen found in cigarette smoke. The aim of this work is to study alterations in peroxiredoxin （Prx） expression induced by NNK during carcinogenesis. Characterization of Prx genes from hamster was performed using bioinformatics.
基金financially supported by the National Natural Science Foundation of China(U1904192,62074052,52072327,61974173,61874159 and 51802081)the Key Science and Technology Research Project of Education Department of Henan Province(19A140003)+1 种基金the Key Science and Technology Program of Henan Province(192102210001)Zhongyuan Thousand Talents(Zhongyuan Scholars)Program of Henan Province(202101510004)。
文摘The development of kesterite photovoltaic solar cells has been hindered by large open-circuit voltage(V_(oc))deficit.Recently,Snzn deep point defect and associative defect cluster have been recognized as the main culprit for the Voc losses.Therefore,manipulating the deep-level donor of Snzn antisite defects is crucial for breaking through the bottleneck of present Cu_(2) ZnSn(S,Se)_(4)(CZTSSe)photovoltaic technology.In this study,the Snzn deep traps in CZTSSe absorber layer are suppressed by incorporation of Ge.The energy levels and concentration of Snzn defects measured by deep-level transient spectroscopy(DLTS)decrease significantly.In addition,the grain growth of CZTSSe films is also promoted due to Ge implantation,yielding the high quality absorber layer.Consequently,the efficiency of CZTSSe solar cells increases from 9.15%to 11.48%,largely attributed to the 41 mV Voc increment.
基金supported by the National Natural Science Foundation of China(62074037,52002073)the Science and Technology Department of Fujian Province(2020I0006)+3 种基金the Natural Science Foundation of Fujian Province(2019J01218)the Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China(2021ZZ124)the Education and Scientific Research Project of Fujian Province(JAT200372)the Scientific Research Project of Fujian Jiangxia University(JXZ2019006)。
文摘The passivation of non-radiative states and inhibition of band tailings are desirable for improving the open-circuit voltage(V_(oc))of CZTSSe thin-film solar cells.Recently,alkali metal doping has been investigated to passivate defects in CZTSSe films.Herein,we investigate Li doping effects by applying Li OH into CZTSSe precursor solutions,and verify that carrier transport is enhanced in the CZTSSe solar cells.Systematic characterizations demonstrate that Li doping can effectively passivate non-radiative recombination centers and reduce band tailings of the CZTSSe films,leading to the decrease in total defect density and the increase in separation distance between donor and acceptor.Fewer free carriers are trapped in the band tail states,which speeds up carrier transport and reduces the probability of deep-level defects capturing carriers.The charge recombination lifetime is about twice as long as that of the undoped CZTSSe device,implying the heterojunction interface recombination is also inhibited.Besides,Li doping can increase carrier concentration and enhance build-in voltage,leading to a better carrier collection.By adjusting the Li/(Li+Cu)ratio to 18%,the solar cell efficiency is increased significantly to 9.68%with the fill factor(FF)of 65.94%,which is the highest FF reported so far for the flexible CZTSSe solar cells.The increased efficiency is mainly attributed to the reduction of V_(oc)deficit and the improved CZTSSe/Cd S junction quality.These results open up a simple route to passivate non-radiative states and reduce the band tailings of the CZTSSe films and improve the efficiency of the flexible CZTSSe solar cells.
文摘Patients with Graves’ disease (GD) have marked lymphocytic infiltration in their thyroid glands We examined the gene for the variable regions of the α chain of the Chinese T cell receptor(V α gene) in intrathyroidal T cells to determine the role of T cells in the pathogenesis of GD and offer potential for the development of immunotherapeutic remedies for GD Methods. We used the reverse transcription and polymerase chain reaction(RT PCR) to amplify complementary DNA(cDNA) for the 18 known families of the V α gene in intrathyroidal T cells from 5 patients with Graves’ disease The findings were compared with the results of peripheral blood T cells in the same patients as well as those in normal subjects Results. We found that marked restriction in the expression of T cell receptor V α genes by T cells from the thyroid tissue of Chinese patients with GD(P<0 001) An average of only 4 6±1 52 of the 18 V α genes were expressed in such samples, as compared with 10 4±2 30V α genes expressed in peripheral blood T cells from the same patients The pattern of expressed V α genes differed from patient to patient with no clear predominance Conclusions. Expression of intrathyroidal T cell receptor V α genes in GD is highly restricted suggesting the primacy of T cells in causing the disorders
文摘BACKGROUNDOver the past 20 years,we have gained a deep understanding of the biologicalheterogeneity of diffuse large B cell lymphoma(DLBCL)and have developed arange of new treatment programs based on the characteristics of the disease,bringing us to the era of immune-chemotherapy.However,the effectiveness andmolecular mechanisms of targeted-immunotherapy remain unclear in DLBCL.Targeted-immunotherapy may be beneficial for specific subgroups of patients,thus requiring biomarker assessment.CASE SUMMARYHere,we report a case of MCD subtype DLBCL with MYD88L265P and CD79Bmutations,considered in the initial stage as lymphoplasmic lymphoma(LPL)orWaldenstrom macroglobulinemia(WM).Flow cytometry supported this view;however,the immunohistochemical results of the lymph nodes overturned theabove diagnosis,and the patient was eventually diagnosed with MCD subtypeDLBCL.The presence of a monoclonal IgM component in the serum and infiltrationof small lymphocytes with a phenotype compatible with WM into the bonemarrow led us to propose a hypothesis that the case we report may have transformedfrom LPL/WM.CONCLUSIONThis highlights the possible transformation from WM to DLBCL,CD79B mutationmay be a potential biomarker for predicting this conversion.
