目的探讨肌萎缩侧索硬化症(amyotrophy lateral sclerosis,ALS)患者初级运动皮层(primary motor cortex,PMC)的face-head区域皮质厚度变化特点及对生存期的影响。方法对同时行头颅MRI扫描的105例ALS患者回顾性分析,PMC区A4hf(face-head...目的探讨肌萎缩侧索硬化症(amyotrophy lateral sclerosis,ALS)患者初级运动皮层(primary motor cortex,PMC)的face-head区域皮质厚度变化特点及对生存期的影响。方法对同时行头颅MRI扫描的105例ALS患者回顾性分析,PMC区A4hf(face-head)区域作为兴趣区域(region of interest,ROI),根据患者临床症状分为延髓受累和未受累两组,分析临床特点和ROI区域的皮质厚度在两组间的差异;根据患者延髓麻痹症状、神经系统查体和舌肌肌电图,将延髓受累ALS分为下运动神经元(lower motor neuron,LMN)、上运动神经元(upper motor neuron,UMN)和LMN+UMN共3组,分析延髓亚组评分和ROI皮质厚度在3组间的差异;将起病年龄、体质量指数、诊断延迟时间、延髓亚组评分和ROI皮质厚度纳入生存分析。结果①延髓受累组ROI皮质厚度明显小于延髓未受累组(-0.198±0.87 vs.0.235±0.95,P=0.017);②延髓亚组评分和ROI皮质厚度在LMN、UMN和LMN+UMN三组间无统计学差异(P>0.05);③生存分析示起病年龄(HR=3.296,95%CI:1.63~6.664,P=0.001)、诊断延迟时间(HR=0.361,95%CI:0.184~0.705,P=0.003)、延髓亚组评分(HR=0.389,95%CI:0.174~0.868,P=0.021)及ZRE_ROI皮质厚度(HR=2.309,95%CI:1.046~5.096,P=0.038)均是ALS患者生存期的独立影响因素。结论大脑运动前回A4hf(face-head)区域的皮质厚度可更为客观反映延髓UMN体征。影响ALS患者生存期的因素除了起病年龄和诊断延迟时间,延髓亚组评分和face-head区域的皮质厚度也是其独立影响因素,且face-head区域皮质变薄是ALS患者生存期的保护因素。展开更多
Based on the two most recent assessments of Chinese higher plants in 2013 and 2020,of 34,450 and 39,330 species,respectively,we analysed the threatened status of Chinese higher plants.In 2020,around 4,088(10.39%)of th...Based on the two most recent assessments of Chinese higher plants in 2013 and 2020,of 34,450 and 39,330 species,respectively,we analysed the threatened status of Chinese higher plants.In 2020,around 4,088(10.39%)of the assessed species in China are threatened,2,875(7.31%)Near Threatened,27,593(70.16%)not currently threatened and categorised as Least Concern and 4,752(12.08%)categorised as Data Deficient.While in 2013,3,767(10.93%)of the assessed higher plants in China are threatened,2,723(7.90%)Near Threatened,24,296(70.53%)Least Concern and 3,612(10.48%)Data Deficient.Estimates of the Red List Index in the two years show different patterns when using different weighting methods with the equal steps weighting method showing a slight decrease(0.91675-0.91495)and the extinction risk weighting method showing a slight increase(0.98792-0.98797).We inferred that China's threatened plant species were likely/relatively effectively protected.However,attention should also be given to the non-threatened species in the future as an additional strategy for their conservation,to maintain their non-threatened status.展开更多
Salmonella typhimurium purB encodes adeny-losuccinate lyase (ASL), the enzyme that catalyzes step 8 in the pathway for de novo synthesis of inosine 5’-monophos-phate (IMP) and also the final reaction in the two-step ...Salmonella typhimurium purB encodes adeny-losuccinate lyase (ASL), the enzyme that catalyzes step 8 in the pathway for de novo synthesis of inosine 5’-monophos-phate (IMP) and also the final reaction in the two-step sequence from IMP to adenosine monophosphate (AMP). The nucleotide sequence ofpurB was obtained by the genetic map and sequence homologous analysis. The conserved pur operator in purB was identified to be located 185 bp downstream of the initiation codon and overlaps codons 62 - 67 in the protein-coding region. The binding of PurR to this operator was demonstrated by gel retardation experiment and site-directed mutagenesis, indicating that the purB is under the control of purR. We also answered why previous study had conflicting report concerning the regulation of purB by purR by identifying the junction site of purB to lacZ in a purB-MudJ (lacZ, Kan’) fusion strain. This result strongly supports that the purB is the second gene in the ycfC-purB operon.展开更多
文摘目的探讨肌萎缩侧索硬化症(amyotrophy lateral sclerosis,ALS)患者初级运动皮层(primary motor cortex,PMC)的face-head区域皮质厚度变化特点及对生存期的影响。方法对同时行头颅MRI扫描的105例ALS患者回顾性分析,PMC区A4hf(face-head)区域作为兴趣区域(region of interest,ROI),根据患者临床症状分为延髓受累和未受累两组,分析临床特点和ROI区域的皮质厚度在两组间的差异;根据患者延髓麻痹症状、神经系统查体和舌肌肌电图,将延髓受累ALS分为下运动神经元(lower motor neuron,LMN)、上运动神经元(upper motor neuron,UMN)和LMN+UMN共3组,分析延髓亚组评分和ROI皮质厚度在3组间的差异;将起病年龄、体质量指数、诊断延迟时间、延髓亚组评分和ROI皮质厚度纳入生存分析。结果①延髓受累组ROI皮质厚度明显小于延髓未受累组(-0.198±0.87 vs.0.235±0.95,P=0.017);②延髓亚组评分和ROI皮质厚度在LMN、UMN和LMN+UMN三组间无统计学差异(P>0.05);③生存分析示起病年龄(HR=3.296,95%CI:1.63~6.664,P=0.001)、诊断延迟时间(HR=0.361,95%CI:0.184~0.705,P=0.003)、延髓亚组评分(HR=0.389,95%CI:0.174~0.868,P=0.021)及ZRE_ROI皮质厚度(HR=2.309,95%CI:1.046~5.096,P=0.038)均是ALS患者生存期的独立影响因素。结论大脑运动前回A4hf(face-head)区域的皮质厚度可更为客观反映延髓UMN体征。影响ALS患者生存期的因素除了起病年龄和诊断延迟时间,延髓亚组评分和face-head区域的皮质厚度也是其独立影响因素,且face-head区域皮质变薄是ALS患者生存期的保护因素。
基金funded by the Natural Science Foundation of Hunan Province,China(2023JJ40443)the Outstanding Youth Project of Hunan Provincial Education Department(22B0088 and 22B0055)+1 种基金the Joint Fund for Regional Innovation and Development of the National Natural Science Foundation(U22A20570)the Science and Technology Innovation Program of Hunan Province(2022RC4027),China.
文摘Based on the two most recent assessments of Chinese higher plants in 2013 and 2020,of 34,450 and 39,330 species,respectively,we analysed the threatened status of Chinese higher plants.In 2020,around 4,088(10.39%)of the assessed species in China are threatened,2,875(7.31%)Near Threatened,27,593(70.16%)not currently threatened and categorised as Least Concern and 4,752(12.08%)categorised as Data Deficient.While in 2013,3,767(10.93%)of the assessed higher plants in China are threatened,2,723(7.90%)Near Threatened,24,296(70.53%)Least Concern and 3,612(10.48%)Data Deficient.Estimates of the Red List Index in the two years show different patterns when using different weighting methods with the equal steps weighting method showing a slight decrease(0.91675-0.91495)and the extinction risk weighting method showing a slight increase(0.98792-0.98797).We inferred that China's threatened plant species were likely/relatively effectively protected.However,attention should also be given to the non-threatened species in the future as an additional strategy for their conservation,to maintain their non-threatened status.
基金Thiswork was supported by the National Natural Science Foundation of China.
文摘Salmonella typhimurium purB encodes adeny-losuccinate lyase (ASL), the enzyme that catalyzes step 8 in the pathway for de novo synthesis of inosine 5’-monophos-phate (IMP) and also the final reaction in the two-step sequence from IMP to adenosine monophosphate (AMP). The nucleotide sequence ofpurB was obtained by the genetic map and sequence homologous analysis. The conserved pur operator in purB was identified to be located 185 bp downstream of the initiation codon and overlaps codons 62 - 67 in the protein-coding region. The binding of PurR to this operator was demonstrated by gel retardation experiment and site-directed mutagenesis, indicating that the purB is under the control of purR. We also answered why previous study had conflicting report concerning the regulation of purB by purR by identifying the junction site of purB to lacZ in a purB-MudJ (lacZ, Kan’) fusion strain. This result strongly supports that the purB is the second gene in the ycfC-purB operon.
