目的:探讨动物生物安全最高级别实验室(ABSL-4实验室)中双层排风高效空气过滤器(high efficiency particulate air filter,HEPA)采用过氧化氢消毒方式的消毒效果。方法:利用市面上2家成熟的A、B品牌过氧化氢消毒机,验证相同体积、规格的...目的:探讨动物生物安全最高级别实验室(ABSL-4实验室)中双层排风高效空气过滤器(high efficiency particulate air filter,HEPA)采用过氧化氢消毒方式的消毒效果。方法:利用市面上2家成熟的A、B品牌过氧化氢消毒机,验证相同体积、规格的2组HEPA在不同消毒液剂量下的消毒效果。结果:实验表明,B品牌消毒机具有风机风量大和智能控制2个优点,可穿透双层HEPA,达到完全灭菌,消毒效果合格。而A品牌消毒机风机速率小,不能完全穿透第二层HEPA,其尾端(出气口端)未达到完全灭菌,消毒效果不合格。结论:通过对A、B两品牌消毒机消毒效果验证分析,建议A品牌消毒机改进风机风量,提高穿透力;B品牌消毒机改进回流和气密性设计,防止泄漏。展开更多
We performed a genome-wide scan to detect selection signatures that showed evidence of positive selection in the domestication process by re-sequencing the whole genomes of Landrace and Yorkshire pigs.Fifteen annotate...We performed a genome-wide scan to detect selection signatures that showed evidence of positive selection in the domestication process by re-sequencing the whole genomes of Landrace and Yorkshire pigs.Fifteen annotated elements with 13 associated genes were identified using the Z-transformed FST(Z(FST))method,and 208 annotated elements with 140 associated genes were identified using the Z-transformed heterozygosity(ZHp)method.The functional analysis and the results of previous studies showed that most of the candidate genes were associated with basic metabolism,disease resistance,cellular processes,and biochemical signals,and several were related to body morphology and organs.They included PPP3CA,which plays an essential role in the transduction of intracellular Ca2+-mediated signals,and WWTR1,which plays a pivotal role in organ size control and tumor suppression.These results suggest that genes associated with body morphology were subject to selection pressure during domestication,whereas genes involved in basic metabolism and disease resistance were subject to selection during artificial breeding.Our findings provide new insights into the potential genetic variation of phenotypic diversity in different pig breeds and will help to better understand the selection effects of modern breeding in Landrace and Yorkshire pigs.展开更多
Birth weight(BW)and days to 100 kg(D100)are important economic traits that are both affected by polygenes.However,the genetic architecture of these quantitative traits is still elusive.Genotyping-by-sequencing(GBS)dat...Birth weight(BW)and days to 100 kg(D100)are important economic traits that are both affected by polygenes.However,the genetic architecture of these quantitative traits is still elusive.Genotyping-by-sequencing(GBS)data containing a large number of single nucleotide polymorphisms(SNPs)have become a powerful tool in genomic analysis.To better understand their complex genetic structure,a total of 600 Yorkshire pigs were sequenced using GBS technology.After quality control,279787 SNPs were generated for subsequent genome-wide association study(GWAS).A total of 30 genome-wide SNPs(P<1.79 E–07)were identified for D100.Furthermore,a total of 22 and 2 suggestive SNPs(P<3.57 E–06)were detected for D100 and BW,respectively.Of these,one locus located on SSC12(position:46226512 bp)were evaluated to affect both BW and D100 in Yorkshire pigs,indicating the pleiotropism in different traits.Considering the function of candidate genes,two genes,NSRP1 and DOCK7,were suggested as the most promising candidate genes involved in growth traits.Thus,use of GBS is able to identify novel variants and potential candidate genes for BW and D100,and provide an opportunity for improving pig growth traits using genomic selection in pigs.展开更多
Chenghua(CH)pig and Qingyu(QY)pig are typical Chinese native fatty breeds.CH pig is mainly distributed in Chengdu Plain,while QY pig is widely distributed throughout the mountain areas around the Sichuan Basin.There a...Chenghua(CH)pig and Qingyu(QY)pig are typical Chinese native fatty breeds.CH pig is mainly distributed in Chengdu Plain,while QY pig is widely distributed throughout the mountain areas around the Sichuan Basin.There are significant differences in their phenotypic traits,including body image,growth performance,and meat quality.This study compared several meat quality traits of CH and QY pigs and conducted a genome-wide DNA methylation analysis using reduced representation bisulfite sequencing(RRBS).It was observed that the pH at 45 min(pH_(45min),P=5.22e-13),lightness at 45 min(L^(*)_(45min),P=4.85e-5),and lightness at 24 h(L^(*)_(24h),P=3.57e-5)of CH pigs were higher than those of QY pigs.We detected 10699 differentially methylated cytosines(DMCs)and 2760 differentially methylated genes(DMGs)associated with these DMCs.Functional analysis showed that these DMGs were mainly enriched in the AMPK signaling pathway,Type II diabetes mellitus,Insulin signaling pathway,mTOR signaling pathway,and Insulin resistance.Furthermore,15 DMGs were associated with fat metabolism(ACACA,CAB39,CRADD,CRTC2,FASN,and GCK),muscle development(HK2,IKBKB,MTOR,PIK3CD,PPARGC1A,and RPTOR),or meat quality traits(PCK1,PRKAG2,and SLC2A4).The findings may help to understand further the epigenetic regulation mechanisms of meat quality traits in pigs and provide new basic data for the study of local pigs.展开更多
Nonlinear transmission property of 7-hydroxyquinoline with excited state proton transfer effect was investigated at 355 and 532nm using picosecond laser pulses.The experiment result shows that the transmissivity of 7-...Nonlinear transmission property of 7-hydroxyquinoline with excited state proton transfer effect was investigated at 355 and 532nm using picosecond laser pulses.The experiment result shows that the transmissivity of 7-hydroxyquinoline is nonlinear at 355nm but it is linear at 532nm.The nonlinear transmissivity of 7-hydroxyquinoline originates from the larger nonlinearity of anion and cation formed in excited state proton transfer process.Therefore,7-hydroxyquinoline might be used as ultrafast optical amplitude limit material.展开更多
文摘目的:探讨动物生物安全最高级别实验室(ABSL-4实验室)中双层排风高效空气过滤器(high efficiency particulate air filter,HEPA)采用过氧化氢消毒方式的消毒效果。方法:利用市面上2家成熟的A、B品牌过氧化氢消毒机,验证相同体积、规格的2组HEPA在不同消毒液剂量下的消毒效果。结果:实验表明,B品牌消毒机具有风机风量大和智能控制2个优点,可穿透双层HEPA,达到完全灭菌,消毒效果合格。而A品牌消毒机风机速率小,不能完全穿透第二层HEPA,其尾端(出气口端)未达到完全灭菌,消毒效果不合格。结论:通过对A、B两品牌消毒机消毒效果验证分析,建议A品牌消毒机改进风机风量,提高穿透力;B品牌消毒机改进回流和气密性设计,防止泄漏。
基金supported by the grants from the Sichuan Science and Technology Program,China(2020YFN0024)the earmarked fund for the China Agriculture Research System(CARS-35-01A)+2 种基金the National Key R&D Program of China(2018YFD0501204)the National Natural Science Foundation of China(C170102)the Sichuan Innovation Team of Pig,China(sccxtd-2021-08)。
文摘We performed a genome-wide scan to detect selection signatures that showed evidence of positive selection in the domestication process by re-sequencing the whole genomes of Landrace and Yorkshire pigs.Fifteen annotated elements with 13 associated genes were identified using the Z-transformed FST(Z(FST))method,and 208 annotated elements with 140 associated genes were identified using the Z-transformed heterozygosity(ZHp)method.The functional analysis and the results of previous studies showed that most of the candidate genes were associated with basic metabolism,disease resistance,cellular processes,and biochemical signals,and several were related to body morphology and organs.They included PPP3CA,which plays an essential role in the transduction of intracellular Ca2+-mediated signals,and WWTR1,which plays a pivotal role in organ size control and tumor suppression.These results suggest that genes associated with body morphology were subject to selection pressure during domestication,whereas genes involved in basic metabolism and disease resistance were subject to selection during artificial breeding.Our findings provide new insights into the potential genetic variation of phenotypic diversity in different pig breeds and will help to better understand the selection effects of modern breeding in Landrace and Yorkshire pigs.
基金supported by grants from the Sichuan Science and Technology Program,China(2020YFN0024)the Sichuan Innovation Team of Pig,Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province(sccxtd-2020-08)+2 种基金the National Key R&D Program of China(2018YFD0501204)the National Natural Science Foundation of China(31530073 and C170102)the the China Agricultural Research System of MOF and MARA(CARS-35-01A)。
文摘Birth weight(BW)and days to 100 kg(D100)are important economic traits that are both affected by polygenes.However,the genetic architecture of these quantitative traits is still elusive.Genotyping-by-sequencing(GBS)data containing a large number of single nucleotide polymorphisms(SNPs)have become a powerful tool in genomic analysis.To better understand their complex genetic structure,a total of 600 Yorkshire pigs were sequenced using GBS technology.After quality control,279787 SNPs were generated for subsequent genome-wide association study(GWAS).A total of 30 genome-wide SNPs(P<1.79 E–07)were identified for D100.Furthermore,a total of 22 and 2 suggestive SNPs(P<3.57 E–06)were detected for D100 and BW,respectively.Of these,one locus located on SSC12(position:46226512 bp)were evaluated to affect both BW and D100 in Yorkshire pigs,indicating the pleiotropism in different traits.Considering the function of candidate genes,two genes,NSRP1 and DOCK7,were suggested as the most promising candidate genes involved in growth traits.Thus,use of GBS is able to identify novel variants and potential candidate genes for BW and D100,and provide an opportunity for improving pig growth traits using genomic selection in pigs.
基金supported by the grants from the Sichuan Science and Technology Program, China (2020YFN0024)the China Agriculture Research System of MOF and MARA (CARS-35-01A)+3 种基金the National Key R&D Program of China (2018YFD0501204)the National Natural Science Foundation of China (C170102)the Sichuan Innovation Team of Pig, China (sccxtd-2021-08)supported by the High-performance Computing Platform of Sichuan Agricultural University, China
文摘Chenghua(CH)pig and Qingyu(QY)pig are typical Chinese native fatty breeds.CH pig is mainly distributed in Chengdu Plain,while QY pig is widely distributed throughout the mountain areas around the Sichuan Basin.There are significant differences in their phenotypic traits,including body image,growth performance,and meat quality.This study compared several meat quality traits of CH and QY pigs and conducted a genome-wide DNA methylation analysis using reduced representation bisulfite sequencing(RRBS).It was observed that the pH at 45 min(pH_(45min),P=5.22e-13),lightness at 45 min(L^(*)_(45min),P=4.85e-5),and lightness at 24 h(L^(*)_(24h),P=3.57e-5)of CH pigs were higher than those of QY pigs.We detected 10699 differentially methylated cytosines(DMCs)and 2760 differentially methylated genes(DMGs)associated with these DMCs.Functional analysis showed that these DMGs were mainly enriched in the AMPK signaling pathway,Type II diabetes mellitus,Insulin signaling pathway,mTOR signaling pathway,and Insulin resistance.Furthermore,15 DMGs were associated with fat metabolism(ACACA,CAB39,CRADD,CRTC2,FASN,and GCK),muscle development(HK2,IKBKB,MTOR,PIK3CD,PPARGC1A,and RPTOR),or meat quality traits(PCK1,PRKAG2,and SLC2A4).The findings may help to understand further the epigenetic regulation mechanisms of meat quality traits in pigs and provide new basic data for the study of local pigs.
基金Supported by the National Natural Science Foundation of China under Grant No.69678020.
文摘Nonlinear transmission property of 7-hydroxyquinoline with excited state proton transfer effect was investigated at 355 and 532nm using picosecond laser pulses.The experiment result shows that the transmissivity of 7-hydroxyquinoline is nonlinear at 355nm but it is linear at 532nm.The nonlinear transmissivity of 7-hydroxyquinoline originates from the larger nonlinearity of anion and cation formed in excited state proton transfer process.Therefore,7-hydroxyquinoline might be used as ultrafast optical amplitude limit material.
