AIM:To estimate the prevalence of irritable bowel syndrome(IBS)in college and university students of North China and certain related factors for IBS.METHODS:A total of 2500 students from Shandong University in North C...AIM:To estimate the prevalence of irritable bowel syndrome(IBS)in college and university students of North China and certain related factors for IBS.METHODS:A total of 2500 students from Shandong University in North China were asked in February-March 2009 to complete questionnaires,including the Rome Ⅲquestionnaire,hospital anxiety and depression scale,and IBS-quality of life questionnaire(IBS-QOL).RESULTS:Among the 2126 students with complete data,the prevalence of IBS was 7.85%according to the RomeⅢcriteria,with a female/male ratio of 1.78:1.Most students had the IBS-constipation subtype (36.5%),followed by IBS-diarrhea subtype(31.1%)and IBS-mixed subtype(23.9%).The students with IBS had a higher anxiety and depression score than those without IBS.Low exercise level and anxiety indicated a high risk for IBS.The mean score of IBS patients was 74.2± 4.242 on the IBS-QOL.CONCLUSION:The prevalence of IBS is 7.85%in Chinese college and university students according to the RomeⅢcriteria.Low exercise level and anxiety may be the risk factors for IBS.展开更多
The transcription factor WRKY70 was previously reported to be a common component in salicylic acid （SA） and jasmonate （JA） mediated signal pathways in Arabidopsis. Here, we present that the inactivation of the WRK...The transcription factor WRKY70 was previously reported to be a common component in salicylic acid （SA） and jasmonate （JA） mediated signal pathways in Arabidopsis. Here, we present that the inactivation of the WRKY70 gene in wrky70-1 mutant does not alter the responses of both JA and SA, and that wrky70 mutation is unable to restore the coil mutant in JA responses. However, overexpression of WRKY70 reduces JA responses such as expression of JA-induced genes and JA-inhibitory root growth, and activates expression of SA-inducible PR1. These data indicate that the WRKY70 is important but not indispensable for JA and SA signaling, and that other regulators may display the redundant role with WRKY70 in modulation of JA and SA responses in Arabidopsis. Furthermore, we showed that JA inhibits expression of WRKY70 and PR1 by both COi1-dependent and COi1-independent pathways.展开更多
Objective: To investigate the potential mechanisms that curcumin reverses 5-fluorouracil(5-FU) multidrug resistance(MDR). Methods: Cell growth and the inhibitory rate of curcumin(2–25 μg/mL) and/or5-FU(0.05–1000 μ...Objective: To investigate the potential mechanisms that curcumin reverses 5-fluorouracil(5-FU) multidrug resistance(MDR). Methods: Cell growth and the inhibitory rate of curcumin(2–25 μg/mL) and/or5-FU(0.05–1000 μg/mL) on human colon cancer HCT-8 and HCT-8/5-FU(5-FU-resistant cel line) were determined using cel counting kit-8(CCK-8) assay. Apoptosis and cel cycle after 5-FU and/or curcumin treatment were detected by ?ow cytometry(FCM) and transmission electron microscopy(TEM). The expression of the multidrug resistance related factors p-glycoprotein(P-gp) and heat shock protein 27(HSP-27) genes and proteins were analyzed by reverse transcription polymerase chain reaction(RT-PCR) and Western blotting(WB), respectively. Results: The inhibitory rate of curcumin or 5-FU on HCT-8 and HCT-8/5-FU cells proliferation at exponential phase were in a dosedependent manner, HCT-8 cell line was more sensitive to curcumin or 5-FU when compared the inhibitory rate of HCT-8/5-FU. The 50% inhibitory concentration(IC50) of combination 5-FU and curcumin(4.0 μg/mL)in HCT-8/5-FU was calculated as 179.26 μg/mL, with reversal fold of 1.85. Another IC50 of combination 5-FU and curcumin(5.5 μg/mL) in HCT-8/5-FU was calculated as 89.25 μg/mL, with reversal fold of 3.71. Synergistic effect of 5-FU and curcumin on HCT-8 and HCT-8/5-FU cells were found. The cell cycle analysis performed by FCM showed that HCT-8 and HCT-8/5-FU cel s mostly accumulated at G0/G1 phase, which suggested a synergistic effect of curcumin and 5-FU to induce apoptosis. FCM analysis found that the percentage of apoptosis of cel s treated with curcumin, 5-FU and their combination were signi?cantly increased compared to the control group(P<0.05), and the percentage of apoptosis of the combination groups were slightly higher than other groups(P<0.05). The m RNA levels of P-gp(0.28±0.02) and HSP-27(0.28±0.09) in HCT-8/5-FU cel s treated with combination drugs were lower than cel s treated with 5-FU alone(P-gp, 0.48±0.07, P=0.009;HSP-27, 0.57±0.10, P=0.007). T展开更多
The high phenotypic plasticity in the shell of oysters presents a challenge during taxonomic and phylogenetie studies of these economically important bivalves. However, because DNA can exhibit marked differences among...The high phenotypic plasticity in the shell of oysters presents a challenge during taxonomic and phylogenetie studies of these economically important bivalves. However, because DNA can exhibit marked differences among morphologically similar species, DNA barcoding offers a potential means for oyster identification. We analyzed the complete sequences of the cytochrome oxidase subunit I （COI） of five common Crassostrea species in China （including Hong Kong oyster C. hongkongensis, Jinjiang oyster C. ariakensis, Portuguese oyster C. angulata, Kumamoto oyster C. sikamea, and Pacific oyster C. gigas） and screened for distinct fragments. Using these distinct fragments on a high-resolution melting analysis platform, we developed an identification method that does not rely on species-specific PCR or fragment length polymorphism and is efficient, reliable, and easy to visualize. Using a single pair of primers （Oyster- COI-1）, we were able to successfully distinguish among the five oyster species. This new method provides a simple and powerful tool for the identification of oyster species.展开更多
Sphaeroma terebrans, a wood-boring isopoda, is distributed worldwide in tropical and subtropical mangroves. The taxonomy of S. terebrans is usually based on morphological characteristics, with its molecular identifica...Sphaeroma terebrans, a wood-boring isopoda, is distributed worldwide in tropical and subtropical mangroves. The taxonomy of S. terebrans is usually based on morphological characteristics, with its molecular identification still poorly understood. The number of teeth on the uropodal exopod and the length of the propodus of the seventh pereopod are considered as the major morphological characteristics in S. terebrans, which can cause difficulty in regards to accurate identification. In this study, we identified S. terebrans via molecular and morphological data. Furthermore, the validity of the mitochondrial cytochrome c oxidase subunit I （COl） gene as a DNA barcode for the identification of genus Sphaeroma, including species S. terebrans, S. retrolaeve, and S. serratum, was examined. The mitochondrial COl gene sequences of all specimens were sequenced and analysed. The interspecific Kimura 2-parameter distances were higher than intraspecific distances and no intraspecificinterspecific distance overlaps were observed. In addition, genetic distance and nucleotide diversity （TT） exhibited no differences within S. terebrans. Our results revealed that the mitochondrial COl gene can serve as a valid DNA barcode for the identification of S. terebrans. Furthermore, the number of teeth on the uropodal exopod and the length of the propodus of the seventh pereopod were found to be unreliable taxonomic characteristics for S. terebrans.展开更多
Let G=(V,E)be a graph andφbe a total coloring of G by using the color set{1,2,...,k}.Let f(v)denote the sum of the color of the vertex v and the colors of all incident edges of v.We say thatφis neighbor sum distingu...Let G=(V,E)be a graph andφbe a total coloring of G by using the color set{1,2,...,k}.Let f(v)denote the sum of the color of the vertex v and the colors of all incident edges of v.We say thatφis neighbor sum distinguishing if for each edge uv∈E(G),f(u)=f(v).The smallest number k is called the neighbor sum distinguishing total chromatic number,denoted byχ′′nsd(G).Pil′sniak and Wo′zniak conjectured that for any graph G with at least two vertices,χ′′nsd(G)(G)+3.In this paper,by using the famous Combinatorial Nullstellensatz,we show thatχ′′nsd(G)2(G)+col(G)-1,where col(G)is the coloring number of G.Moreover,we prove this assertion in its list version.展开更多
基金Supported by The National Natural Science Foundation of China,No.30770990Medical Science and Technique Foundation of Shandong Province,No.2009GG10002009
文摘AIM:To estimate the prevalence of irritable bowel syndrome(IBS)in college and university students of North China and certain related factors for IBS.METHODS:A total of 2500 students from Shandong University in North China were asked in February-March 2009 to complete questionnaires,including the Rome Ⅲquestionnaire,hospital anxiety and depression scale,and IBS-quality of life questionnaire(IBS-QOL).RESULTS:Among the 2126 students with complete data,the prevalence of IBS was 7.85%according to the RomeⅢcriteria,with a female/male ratio of 1.78:1.Most students had the IBS-constipation subtype (36.5%),followed by IBS-diarrhea subtype(31.1%)and IBS-mixed subtype(23.9%).The students with IBS had a higher anxiety and depression score than those without IBS.Low exercise level and anxiety indicated a high risk for IBS.The mean score of IBS patients was 74.2± 4.242 on the IBS-QOL.CONCLUSION:The prevalence of IBS is 7.85%in Chinese college and university students according to the RomeⅢcriteria.Low exercise level and anxiety may be the risk factors for IBS.
基金the National Natural Science Foundation of China (30630044,30671121,30770195 and 30771147).
文摘The transcription factor WRKY70 was previously reported to be a common component in salicylic acid （SA） and jasmonate （JA） mediated signal pathways in Arabidopsis. Here, we present that the inactivation of the WRKY70 gene in wrky70-1 mutant does not alter the responses of both JA and SA, and that wrky70 mutation is unable to restore the coil mutant in JA responses. However, overexpression of WRKY70 reduces JA responses such as expression of JA-induced genes and JA-inhibitory root growth, and activates expression of SA-inducible PR1. These data indicate that the WRKY70 is important but not indispensable for JA and SA signaling, and that other regulators may display the redundant role with WRKY70 in modulation of JA and SA responses in Arabidopsis. Furthermore, we showed that JA inhibits expression of WRKY70 and PR1 by both COi1-dependent and COi1-independent pathways.
基金Supported by China Science Fund of Clinical Oncology(No.Y-L2014-002)
文摘Objective: To investigate the potential mechanisms that curcumin reverses 5-fluorouracil(5-FU) multidrug resistance(MDR). Methods: Cell growth and the inhibitory rate of curcumin(2–25 μg/mL) and/or5-FU(0.05–1000 μg/mL) on human colon cancer HCT-8 and HCT-8/5-FU(5-FU-resistant cel line) were determined using cel counting kit-8(CCK-8) assay. Apoptosis and cel cycle after 5-FU and/or curcumin treatment were detected by ?ow cytometry(FCM) and transmission electron microscopy(TEM). The expression of the multidrug resistance related factors p-glycoprotein(P-gp) and heat shock protein 27(HSP-27) genes and proteins were analyzed by reverse transcription polymerase chain reaction(RT-PCR) and Western blotting(WB), respectively. Results: The inhibitory rate of curcumin or 5-FU on HCT-8 and HCT-8/5-FU cells proliferation at exponential phase were in a dosedependent manner, HCT-8 cell line was more sensitive to curcumin or 5-FU when compared the inhibitory rate of HCT-8/5-FU. The 50% inhibitory concentration(IC50) of combination 5-FU and curcumin(4.0 μg/mL)in HCT-8/5-FU was calculated as 179.26 μg/mL, with reversal fold of 1.85. Another IC50 of combination 5-FU and curcumin(5.5 μg/mL) in HCT-8/5-FU was calculated as 89.25 μg/mL, with reversal fold of 3.71. Synergistic effect of 5-FU and curcumin on HCT-8 and HCT-8/5-FU cells were found. The cell cycle analysis performed by FCM showed that HCT-8 and HCT-8/5-FU cel s mostly accumulated at G0/G1 phase, which suggested a synergistic effect of curcumin and 5-FU to induce apoptosis. FCM analysis found that the percentage of apoptosis of cel s treated with curcumin, 5-FU and their combination were signi?cantly increased compared to the control group(P<0.05), and the percentage of apoptosis of the combination groups were slightly higher than other groups(P<0.05). The m RNA levels of P-gp(0.28±0.02) and HSP-27(0.28±0.09) in HCT-8/5-FU cel s treated with combination drugs were lower than cel s treated with 5-FU alone(P-gp, 0.48±0.07, P=0.009;HSP-27, 0.57±0.10, P=0.007). T
基金Supported by the National Basic Research Program of China(973 Program)(No.2010CB126402)the National Natural Science Foundation of China(Nos.40730845,41206149)+4 种基金the Shandong Provincial Natural Science Foundation(No.ZR2010DQ024)the National High Technology Research and Development Program of China(863 Program)(No.2012AA10A405)the Earmarked Fund for Modern Agro-Industry Technology Research System(No.CARS-48)the Taishan Scholar Program of Shandong Provincethe Taishan Scholar Climbing Program of Shandong Province
文摘The high phenotypic plasticity in the shell of oysters presents a challenge during taxonomic and phylogenetie studies of these economically important bivalves. However, because DNA can exhibit marked differences among morphologically similar species, DNA barcoding offers a potential means for oyster identification. We analyzed the complete sequences of the cytochrome oxidase subunit I （COI） of five common Crassostrea species in China （including Hong Kong oyster C. hongkongensis, Jinjiang oyster C. ariakensis, Portuguese oyster C. angulata, Kumamoto oyster C. sikamea, and Pacific oyster C. gigas） and screened for distinct fragments. Using these distinct fragments on a high-resolution melting analysis platform, we developed an identification method that does not rely on species-specific PCR or fragment length polymorphism and is efficient, reliable, and easy to visualize. Using a single pair of primers （Oyster- COI-1）, we were able to successfully distinguish among the five oyster species. This new method provides a simple and powerful tool for the identification of oyster species.
基金funded by the GEF China Wetlands System Project,Science and Technology Foundation of Macao(045/2010/A)Special Fund for Marine-Scientific Research in the Public Interest(201305021)
文摘Sphaeroma terebrans, a wood-boring isopoda, is distributed worldwide in tropical and subtropical mangroves. The taxonomy of S. terebrans is usually based on morphological characteristics, with its molecular identification still poorly understood. The number of teeth on the uropodal exopod and the length of the propodus of the seventh pereopod are considered as the major morphological characteristics in S. terebrans, which can cause difficulty in regards to accurate identification. In this study, we identified S. terebrans via molecular and morphological data. Furthermore, the validity of the mitochondrial cytochrome c oxidase subunit I （COl） gene as a DNA barcode for the identification of genus Sphaeroma, including species S. terebrans, S. retrolaeve, and S. serratum, was examined. The mitochondrial COl gene sequences of all specimens were sequenced and analysed. The interspecific Kimura 2-parameter distances were higher than intraspecific distances and no intraspecificinterspecific distance overlaps were observed. In addition, genetic distance and nucleotide diversity （TT） exhibited no differences within S. terebrans. Our results revealed that the mitochondrial COl gene can serve as a valid DNA barcode for the identification of S. terebrans. Furthermore, the number of teeth on the uropodal exopod and the length of the propodus of the seventh pereopod were found to be unreliable taxonomic characteristics for S. terebrans.
基金supported by National Natural Science Foundation of China(Grant Nos.11101243 and 11371355)the Research Fund for the Doctoral Program of Higher Education of China(Grant No.20100131120017)the Scientific Research Foundation for the Excellent Middle Aged and Youth Scientists of Shandong Province of China(Grant No.BS2012SF016)
文摘Let G=(V,E)be a graph andφbe a total coloring of G by using the color set{1,2,...,k}.Let f(v)denote the sum of the color of the vertex v and the colors of all incident edges of v.We say thatφis neighbor sum distinguishing if for each edge uv∈E(G),f(u)=f(v).The smallest number k is called the neighbor sum distinguishing total chromatic number,denoted byχ′′nsd(G).Pil′sniak and Wo′zniak conjectured that for any graph G with at least two vertices,χ′′nsd(G)(G)+3.In this paper,by using the famous Combinatorial Nullstellensatz,we show thatχ′′nsd(G)2(G)+col(G)-1,where col(G)is the coloring number of G.Moreover,we prove this assertion in its list version.
