Spatial distribution features of sequence types of moderate and strong earthquake in Chinese mainland

Based on 294 earthquake sequences with magnitude greater than or equal to 5.0 occurred in Chinese mainland since 1970, the spatial distribution features of sequence types have been studied. In southwestern China, it takes mainshock-aftershock sequence type （MAT） as the major in Chuan-Dian rhombic block and concerned Xianshuihe-Anninghe-Xiaojiang seismic belt, as well as in Jinshajiang-Honghe seismic belt. Multiple mainshock type （MMT） mainly distributes in western Yunnan, and Longlin and Lancang areas in Tengchong-Baoshan block in west of Nujiang-Lancangjiang fault zone. A few isolated earthquake type （IET） mainly occurred in northwestern Sichuan and there is no IET occurred in Yunnan region. In northwestern China, it takes mainshock-aftershock sequence type （MAT） as the major in west segment of South Tianshan in Xinjiang region. Some MMT also occurred in this area in the intersection of Kalpin block and the Puchang fault zone. It takes IET as the major in middle Tianshan in Xinjiang. Along the Qilianshan seismic belt, most of sequences are MAT. In Qinghai region, it takes MAT as the major, but the regional feature of the spatial distribution of sequence types is not very clear. In North China, it takes MAT as the major in Yinshan-Yanshan-Bohai seismic belt, north edge of North China, and in Hebei plain seismic belt, as well as in sub-plate of lower river area of Yangtze River. In intersection of north segment of Shanxi seismic belt and the NW-trending Yinshan-Yanshan-Bohai seismic belt, there are several moderate or strong MMT with magnitude from 5.0 to 6.0 occurred. In south of North China around the latitude line of 35°N, it takes IET as the major. The spatial distribution of sequence types is relevant to the patterns of tectonic movements. MAT is mostly produced by the ruptures of locked units or asperities or the neonatal separating segments inside the fault zones. MMT is generally relevant to the conjugate structures or intersection of many tectonic settings. Further extension of simple fault often produces IET. Spatial distribution of sequence types is also correlative to the regional and deep environment of crustal medium to some extent. MAT mainly distributes in high velocity area in upper crust or in the transition zone between high velocity area and low velocity area, MMT mostly occurred in the low velocity area in upper crust.

On complete convergence for Stout's type weighted sums of NOD sequence

In this paper, the complete convergence for the weighted sums of independent and identically distributed random variables in Stout [9] is improved and extended under NOD setup.The more optimal moment condition is given. The main results also hold for END sequence.

ISHIKAWA TYPE ITERATIVE SEQUENCES WITH ERRORS FOR LIPSCHITZIAN φ-STRONGLY ACCRETIVE OPERATOR EQUATIONS IN ARBITRARY BANACH SPACES

In this paper, we investigate the problem of approximating solutions of the equations of Lipschitzian ψ-strongly accretive operators and fixed points of Lipschitzian ψ-hemicontractive operators by lshikawa type iterative sequences with errors. Our results unify, improve and extend the results obtained previously by several authors including Li and Liu (Acta Math. Sinica 41 (4)(1998), 845-850), and Osilike (Nonlinear Anal. TMA, 36(1)(1999), 1-9), and also answer completely the open problems mentioned by Chidume (J. Math. Anal. Appl. 151 (2)(1990), 453-461).

Relationship between the earthquake sequences of Tangshan and Xingtai and the three dimensional velocity structure──Discussion on predicting strong earthquakes of swarm-type

In this paper, based on the results of tomographic image of Tangshan and Xingtai areas, the relations between thecharacteristics of the two strong earthquake sequences and their three-dimensional velocity structures are studied.The research results indicate that:① Mosaic distribution of low-velocity bodies and high-velocity bodies, especially the existence of high-velocity bodies with large size in crust are the common basis of development of thetwo earthquake sequences. ② Scale, depth, and heterogeneity of high-velocity and low-velocity bodies are theimportant factors to effect the characteristic of earthquake sequences. ③ The depth of the high-velocity body inTangshan area is less than that in Xingtai area, which is the principal reason why the dominant focal depth and thebiggest focal depth of Tangshan earthquake sequence are less than Xingtai's. ④ The depth of the high-velocitybodies in Ninghe area is more than that in Tangshan-Luanxian area, which lead to the biggest magnitude and epicentral intensity are lower. These results could be helpful for predicting the main shock of strong swarm-typeearthquakes and later strong aftershocks.

Increased Electrophoretic Mobility of Long-Type GATA-6 Transcription Factor upon Substitution of Its PEST Sequence

The transcriptional factor GATA-6 gene produces two translational isoforms from a single mRNA through ribosomal leaky scanning. L-type GATA-6 has an extension of 146 amino acid residues at its amino terminus. In the extension, there is a unique PEST sequence (Glu31-Cys46), which is composed of an amino terminal Pro-rich segment and a carboxyl terminal Ser-cluster. Substitution of either half of the PEST sequence with Ala residues by cassette mutagenesis reduced the apparent molecular size of L-type GATA-6 on SDS-polyacrylamide gel-electrophoresis. However, the effect of substitution of the Pro-rich segment was much more significant;the mobility increase of the Pro-rich segment on the gel was 13% while that of the Ser-cluster was 8%. Substitution of each amino acid residue demonstrated that the effect of Pro substitution is greater than that of the Ser and Thr residues. Such increased mobility of L-type GATA-6 in the presence of a detergent may apparently correlate with the decrease in transcription activity in vivo as determined by means of luciferase reporter gene assay. The activity of ΔAla (with Ala residues instead of the PEST sequence) was reduced to one fifth of that of ΔA (with the PEST sequence). These results suggest that the PEST sequence of L-type GATA-6 does not function as a constitutive protein degradation signal, but rather plays structural and functional roles in the activation of gene expression on the GATA responsive promoter.

生鲜蔬菜来源的蜡样芽胞杆菌毒力基因分布与MLST分析

为了解生鲜蔬菜来源蜡样芽胞杆菌的分子流行病学特征,采用PCR技术对来自5种生鲜蔬菜的37株蜡样芽胞杆菌分离株进行了毒力基因(nheA、nheB、nheC、hblA、hblC、hblD、entFM、cytK、ces)检测和多位点序列分型(MLST)分析。结果表明:37株分离株除呕吐毒素基因ces未检出外,其他8个毒力基因均有检出,其中溶血性肠毒素基因nheB的检出率最高,为94.6%,其次为溶血素基因hblC、hblD、hblA和肠毒素基因entFM,检出率均超过80%,溶血性肠毒素基因nheA和nheC检出率较低,分别为78.4%和64.9%;细胞毒素基因cytK的检出率最低,为29.7%。根据毒力基因携带模式,将37株分离菌株分成14个型别,II型携带率最高,携带Hbl和Nhe两种基因的型别有I型、II型和IV型。MLST分析则发现,37株分离菌株可分为30个ST型和5个CC群。ST4和ST378为主要ST型;CC142分布最广泛,不仅包含的ST型最多,而且携带5种毒力型别。以上结果表明,上海市蔬菜中蜡样芽胞杆菌具有潜在肠毒性危害并在遗传上呈现出多样性。该结果对蔬菜中蜡样芽胞杆菌引起食物的监控、预警和爆发后感染源追踪具有指导意义。

强化降脂对急性ST段抬高型心肌梗死介入治疗的影响

目的 观察强化降脂对急性ST段抬高型心肌梗死介入治疗的影响。方法 选取2021年1月—2022年5月白银市第一人民医院收治的急性ST段抬高型心肌梗死介入治疗患者71例,采用随机数字表法分为试验组36例和对照组35例。对照组给予注射用阿替普酶治疗,试验组在对照组治疗基础上给予阿托伐他汀钙片治疗,2组均连续治疗21 d。比较2组临床疗效,治疗前后心功能指标[左室射血分数(LVEF)、左室收缩末期内径(LVESD)、左室舒张末期内径(LVEDD)]、血脂指标[低密度脂蛋白胆固醇(LDL-C)、高密度脂蛋白胆固醇(HDL-C)、总胆固醇(TC)及三酰甘油(TG)]、血液生化指标[超氧化物歧化酶(SOD)、肌酸激酶同工酶(CK-MB)、心肌肌钙蛋白T(cTnT)]。结果 试验组治疗总有效率为97.22%,高于对照组的77.14%(χ^(2)=4.777,P=0.029)。治疗21 d后,2组LVEF高于治疗前,LVESD、LVEDD小于治疗前,且试验组升高/减小幅度大于对照组(P<0.01);2组LDL-C、TC、TG水平与CK-MB、cTnT水平低于治疗前,HDL-C与SOD水平高于治疗前,且试验组降低/升高幅度大于对照组(P<0.05或P<0.01)。结论 强化降脂可提高急性ST段抬高型心肌梗死介入治疗的临床效果,可有效改善患者心功能,缓解心肌损伤,调节血脂。

血清H-FABP、GDF-15表达对STEMI患者PCI后不良心血管事件的预测价值

目的:探究血清心型脂肪酸结合蛋白(heart-type fatty acid binding protein,H-FABP)、生长分化因子-15(growth and differentiation factor-15,GDF-15)表达对ST段抬高型心肌梗死(ST-segment elevation myocardial infarction,STEMI)患者经皮冠状动脉介入治疗(percutaneous coronary intervention,PCI)后不良心血管事件发生的预测价值。方法:采用前瞻性研究,选择2020年6月—2023年6月于赣州市人民医院接受PCI的140例STEMI患者作为研究对象,术前检测患者血清H-FABP、GDF-15,行PCI,术后随访3个月,统计患者术后不良心血管事件发生情况,分析血清H-FABP、GDF-15与STEMI患者术后不良心血管事件发生的关系,同时绘制受试者工作特征(receiver operating characteristic,ROC)曲线,探究血清H-FABP、GDF-15对STEMI患者PCI后不良心血管事件发生的预测价值。结果:随访3个月期间,140例患者均无脱落病例;随访期间,140例STEMI患者PCI后发生不良心血管事件占比为23.57%(33/140),未发生不良心血管事件占比为76.43%(107/140)。两组心肌梗死面积、高血压、既往吸烟史比较,差异均有统计学意义(P<0.05);两组性别、年龄、病变支数、既往饮酒史、肌红蛋白(myoglobin,Myo)、心肌肌钙蛋白I(cardiac troponin I,cTnI)、肌酸激酶同工酶(creatine kinase-MB,CK-MB)、心室舒张末期内径(left ventricular end diastolic dimension,LVEDD)比较,差异均无统计学意义(P>0.05)。发生组血清H-FABP、GDF-15均高于未发生组,差异均有统计学意义(P<0.05)。点二列相关性分析显示,血清H-FABP、GDF-15与STEMI患者PCI后不良心血管事件发生呈正相关(r>0,P<0.05)。ROC曲线结果显示,血清H-FABP、GDF-15单独预测的AUC>0.7,联合预测的AUC>0.8,联合预测价值更高。结论:STEMI患者PCI前血清H-FABP、GDF-15水平越高,术后不良心血管事件发生风险越大,且临床可以将血清H-FABP、GDF-15作为STEMI患者PCI后不良心血管事件发生的有效预测指标。

Use of transcriptome sequencing to explore the effect of CSRP3 on chicken myoblasts

The mechanisms that regulate the specificity and maintenance of chicken muscle fiber types remain largely unknown. In mammals, CSRP3 has been shown to play a vital role in the maintenance of typical muscle structure and function. This study investigated the role that CSRP3 plays in chicken skeletal muscle. First, the antibody against chicken CSRP3 protein was prepared, and the expression levels of the mRNA and protein of the CSRP3 gene in four chicken skeletal muscles with different myofiber compositions were compared. Then the effects of CSRP3 silencing on the expression profile of chicken myoblast transcriptomes were analyzed. The results showed that the expression levels of the mRNA and protein of the CSRP3 gene were both associated with the composition of fiber types in chicken skeletal muscles. A total of 650 genes with at least 1.5-fold differences(Q<0.05) were identified, of which 255 genes were upregulated and 395 genes were downregulated by CSRP3 silencing. Functional enrichment showed that several pathways, including adrenergic signaling in cardiomyocytes, adipocytokine signaling pathway and apelin signaling pathway, were significantly(P<0.05) enriched both in differentially expressed genes and all expressed genes. The co-expressed gene network suggested that CSRP3 silencing caused a compensatory upregulation(Q<0.05) of genes related to the assembly of myofibrils, muscle differentiation, and contraction. Meanwhile, two fast myosin heavy chain genes(MyH1B and MyH1E)were upregulated(Q<0.05) upon CSRP3 silencing. These results suggested that CSRP3 plays a crucial role in chicken myofiber composition, and affects the distribution of chicken myofiber types, probably by regulating the expression of MyH1B and MyH1E.

PRI modulation recognition and sequence search under small sample prerequisite

Pulse repetition interval(PRI)modulation recognition and pulse sequence search are significant for effective electronic support measures.In modern electromagnetic environments,different types of inter-pulse slide radars are highly confusing.There are few available training samples in practical situations,which leads to a low recognition accuracy and poor search effect of the pulse sequence.In this paper,an approach based on bi-directional long short-term memory(BiLSTM)networks and the temporal correlation algorithm for PRI modulation recognition and sequence search under the small sample prerequisite is proposed.The simulation results demonstrate that the proposed algorithm can recognize unilinear,bilinear,sawtooth,and sinusoidal PRI modulation types with 91.43% accuracy and complete the pulse sequence search with 30% missing pulses and 50% spurious pulses under the small sample prerequisite.

预后营养指数与急性ST段抬高型心肌梗死合并2型糖尿病患者经皮冠状动脉介入术后院内主要不良心血管事件关系的研究

背景 近年来我国糖尿病和心血管疾病患病人数逐年增加,已有研究证明了糖尿病可扩大心血管疾病的不良影响,涉及营养和炎症途径。预后营养指数(PNI)是免疫营养的标志,可反映个体的炎症、免疫状态和营养状况。由于其简单、快速、易得和可靠等优点,近年来关于PNI在各系统中的研究越来越多,但少有文献探讨PNI在心血管疾病中的作用。目的 本研究旨在探讨PNI与急性ST段抬高型心肌梗死(STEMI)合并2型糖尿病(T2DM)患者经皮冠状动脉介入(PCI)术后发生院内主要不良心血管事件(MACE)的关系。方法 回顾性分析2015年1月—2023年6月在新疆医科大学第一附属医院1 053例行PCI术的STEMI合并T2DM患者的临床资料。收集患者资料,计算PNI,根据患者住院期间是否发生MACE,分为MACE组(177例)和非MACE组(876例)。同时依据PNI预测STEMI合并T2DM患者行PCI术后发生院内MACE的截断值将患者分为高PNI组(686例)与低PNI组(367例)。采用单因素及多因素Logistic回归分析探究STEMI合并T2DM患者行PCI后发生院内MACE的影响因素。绘制受试者工作特征(ROC)曲线探究PNI对STEMI合并T2DM患者行PCI术后发生院内MACE的预测价值,计算曲线下面积(AUC)。采用Pearson相关性分析或Spearman秩相关分析探究PNI与心血管疾病危险因素之间的相关性。结果MACE组和非MACE组性别、年龄、高血压病史、血清葡萄糖、Killip分级、乳酸脱氢酶、心率、肌红蛋白、肌酸激酶-MB同工酶(CK-MB)、白细胞计数、脑钠肽(BNP)、PNI、全球急性冠脉事件注册(GRACE)评分、血红蛋白、血小板计数、淋巴细胞计数、白蛋白、总蛋白、肌酐、尿素氮、三酰甘油比较,差异有统计学意义(P<0.05)。多因素Logistic回归分析结果显示,血清葡萄糖升高(OR=1.055,95%CI=1.002~1.112,P=0.044)、GRACE评分高(OR=1.034,95%CI=0.876~0.939,P<0.001)是STEMI合并T2DM患者行PCI术后发生院内MACE的危险因素,PNI升高(OR=0.907,95%CI=1.017~1.050,P<0.001)是患者行PCI术后发生院内MACE的保护因素。PNI预测STEMI合并T2DM患者行PCI术后发生院内MACE的AUC为0.734(95%CI=0.694~0.773),通过Logistic回归分析构建预测模型,模型预测STEMI合并T2DM患者行PCI术后发生院内MACE的AUC为0.791(95%CI=0.753~0.858)。低PNI组发生MACE、主动脉内球囊反搏比例、住院天数、血清葡萄糖、肌钙蛋白T、CK-MB、肌红蛋白、BNP、C反应蛋白、肌酐、尿素氮高于高PNI组,光学相干断层扫描技术比例、总胆固醇、三酰甘油、HDL-C、血红蛋白低于高PNI组(P<0.05)。相关性分析结果显示,PNI与血红蛋白、HDL-C、总胆固醇、三酰甘油呈正相关(P<0.05);PNI与血清葡萄糖、肌酐、尿素氮、BNP、肌钙蛋白T、CK-MB、肌红蛋白、C反应蛋白呈负相关(P<0.05)。结论 PNI是STEMI合并T2DM患者PCI术后院内发生MACE的独立预测因素,临床中可作为监控患者免疫营养状态且预测患者短期预后的辅助指标。

Genetic Types of Meter-Scale Cyclic Sequences and Fabric Natures of Facies Succession

Different genetic types of meter-scale cyclic sequences in stratigraphic records result from episodic accumulation of strata related to Milankovitch cycles. The distinctive fabric natures of facies succession result from the sedimentation governed by different sediment sources and sedimentary dynamic conditions in different paleogeographical backgrounds, corresponding to high-frequency sea-level changes. Naturally, this is the fundamental criterion for the classification of genetic types of meter-scale cyclic sequences. The widespread development in stratigraphic records and the regular vertical stacking patterns in long-term sequences, the evolution characters of earth history and the genetic types reflected by specific fabric natures of facies successions in different paleogeographical settings, all that show meter-scale cyclic sequences are not only the elementary working units in stratigraphy and sedimentology, but also the replenishment and extension of parasequence of sequence stratigraphy. Two genetic kinds of facies succession for meter-scale cyclic sequence in neritic-facies strata of carbonate and clastic rocks, are normal grading succession mainly formed by tidal sedimentation and inverse grading succession chiefly made by wave sedimentation, and both of them constitute generally shallowing upward succession, the thickness of which ranges from several tens of centimeters to several meters. The classification of genetic types of meter-scale cyclic sequence could be made in terms of the fabric natures of facies succession, and carbonate meter-scale cyclic sequences could be divided into four types: L-M type, deep-water asymmetrical type, subtidal type and peritidal type. Clastic meter-scale cyclic sequences could be grouped into two types: tidal-dynamic type and wave-dynamic type. The boundaries of meter-scale cyclic sequences are marked by instantaneous punctuated surface formed by non-deposition resulting from high-frequency level changes, which include instantaneous exposed punctuated surface, drowned punctuated surface as well as their relative surface. The development of instantaneous punctuated surface used as the boundary of meter-scale cyclic sequence brings about the limitations of Walter's Law on the explanation of facies distribution in time and space, and reaffirm the importance of Sander's Rule on analysis of stratigraphic records. These non-continuous surface could be traced for long distance and some could be correlative within same basin range. The study of meter-scale cyclic sequences and their regularly vertical stacking patterns in long-term sequences indicate that the research into cyclicity of stratigraphic records is a useful way to get more regularity from stratigraphic records that are frequently complex as well as non-integrated.

Genetic Evolution Analysis on Wild Isolates of Citrus Tristeza Virus Originated in China Based on Coat Protein Genes Sequences

The coat protein （CP） genes were cloned and sequenced from viral particles of 11 isolates of citrus tristeza virus （CTV） collected from wild citrus plants in China and 4 Chinese isolates from cultivated sweet orange and pummelo varieties, respectively. By analyzing and comparing the nucleotide and amino acid sequences of CP genes, the 11 wild CTV isolates were found over 92% identical with 4 Chinese CTV isolates and 21 exotic CTV isolates from cultivated citrus. From 91 to 100% of the CTV CP gene sequences in wild type citrus plants were generally well conserved. Genetic evolution analysis indicated that the GC% of the CP gene was less than AT%, and more transition were found in the CP genes than transversion with the transition/transversion ratio ranging from 6.3 to 7.0 among species. The substitution frequency was the highest at the third codon, followed by the first and second codon. The ratio of non-synonymous mutations （du） to synonymous mutations （ds） was far lower than 1, suggesting that the CP gene might have experienced purifying selection in the evolution. Phylogenetic analysis revealed that the 11 CTV isolates in Chinese wild type citrus belonged to different phylogenetic clusters, and shared higher homology and closer relationships with other cultivated citrus CTV isolates from different countries, which indicated complicated genetic relationships among the CTV isolates. In addition, CTV isolates with similar biological characteristics usually located into the same clusters. Therefore, the conclusion was drawn that pathogenicity was critical to evolution and origin of CTV.

非ST段抬高型心肌梗死患者梗死相关血管闭塞状态与血栓类型的关系

目的运用光学相干断层成像(OCT)探讨非ST段抬高型心肌梗死(NSTEMI)患者的梗死相关血管(IRA)闭塞状态与血栓类型的关系。方法回顾性研究2021年10月至2023年8月于河南省人民医院行急诊冠状动脉介入治疗且术中使用OCT检查的NSTEMI患者170例,其中IRA完全闭塞组83例,IRA非完全闭塞组87例,结合患者基线特征、造影结果及OCT结果进行比较分析。结果与IRA非完全闭塞组相比,IRA完全闭塞组的患者更年轻(P=0.013),男性比例更高(P=0.026),而患高血压病(P=0.010)和糖尿病(P=0.033)的比例较低。冠状动脉造影结果表明,IRA完全闭塞组IRA多见于左回旋支,而IRA非完全闭塞组多见于左前降支(P=0.012);IRA完全闭塞组侧支循环分级Ⅱ~Ⅲ级的比例高于IRA非完全闭塞组(P=0.022)。OCT结果显示,IRA完全闭塞组多数情况下由斑块破裂事件引起(P=0.014),主要以红色/混合血栓为主(P<0.001);而IRA非完全闭塞组则更常见于斑块侵蚀事件(P=0.014),以白色血栓为主(P<0.001)。结论NSTEMI患者IRA完全闭塞常发于左回旋支,且患者更年轻,血栓类型以红色/混合血栓为主,而IRA非完全闭塞病变以白色血栓为主。

重组人尿激酶原对ST段抬高型心肌梗死患者急诊介入治疗术后无复流现象及预后的影响

目的探讨经微导管冠状动脉内注射重组人尿激酶原对急性ST段抬高型心肌梗死(STEMI)患者急诊经皮冠状动脉介入治疗(PCI)术后无复流现象及预后的影响。方法收集2018年1月至2019年1月在唐山市工人医院接受治疗的急性STEMI急诊PCI术患者185例,随机分为对照组92例和试验组93例,对照组冠状动脉造影后给予替罗非班10μg/kg,3 min内经微导管冠状动脉内注射完毕。试验组在对照组基础上联合重组人尿激酶原10 mg,经微导管冠状动脉内注射。观察并比较2组PCI术后心肌梗死溶栓试验(TIMI)血流分级、校正的TIMI血流帧数(CTFC)、心肌损伤标志物、左心室射血分数(LVEF)、主要不良心血管事件(MACE)、出血事件发生情况。结果试验组TIMI血流3级显著高于对照组(79.57%vs 59.78%),CTFC[(28.94±3.93)帧vs(35.12±5.20)帧]、PCI术后MACE总发生率(8.60%vs 26.09%)低于对照组,差异有统计学意义(P<0.01)。试验组PCI术后7 d肌钙蛋白I、肌酸激酶同工酶显著低于对照组,LVEF显著高于对照组,差异有统计学意义(P<0.01)。2组出血事件以消化道出血、泌尿道出血、牙龈出血、鼻黏膜出血为主,对照组和试验组总出血发生率分别为6.52%、6.45%,差异无统计学意义(P>0.05)。结论经微导管冠状动脉内联合注射膜糖蛋白Ⅱb/Ⅲa受体拮抗剂和重组人尿激酶原对STEMI患者急诊PCI术后无复流现象有积极影响,且有利于预后改善,同时未增加出血风险。

骨质疏松椎体骨折磁共振STIR信号改变与CT骨折线类型的关系

目的探讨骨质疏松椎体骨折磁共振(MRI)-短反转时间反转恢复序列(STIR)信号改变与电子计算机断层扫描(CT)骨折线类型的关系。方法回顾性分析收治的108例骨质疏松椎体骨折患者临床资料以及MRI、CT影像学征象。比较不同MRI-STIR信号改变患者的CT骨折线类型及CT值。结果经MRI检查,入组患者骨折椎体数共121节,STIR序列呈现黑色线信号45节,无同源高信号36节,同源高信号40节;CT显示,骨折线嵌插型51节,开裂型33节,微骨折型37节。MRI-STIR序列呈现黑色线信号的患者椎体CT骨折线为嵌插型阳性率高于无同源高信号和同源高信号,差异有统计学意义(P<0.05);MRI-STIR序列呈现同源高信号的患者椎体CT骨折线为微骨折型阳性率高于黑色线信号和无同源高信号,差异有统计学意义(P<0.05)。MRI-STIR序列呈现黑色线信号的患者椎体CT值低于无同源高信号和同源高信号,差异有统计学意义(P<0.05)。结论MRI-STIR信号改变与CT骨折线类型存在一定相关性。STIR序列呈现黑色线信号的患者出现椎体嵌插型骨折风险更高,且预后较差。

MLST技术分析中国烟草野火病菌遗传多样性

明确烟草野火病菌多位点序列分型(MLST)情况,能为制订有效防治措施和选育品种提供强力技术支撑,并为病菌的生物学特性研究提供新视角。从湖南、重庆等5个产烟省(市)烟草生产区采集烟草野火病样,组织分离并鉴定,应用MLST分型,筛选管家基因,分析供试菌株遗传多样性。结果表明,从湖南等5个产烟省(市)分离获得烟草野火病菌144株,筛选得到Pgi、Pfk和Gap 3个管家基因,共获得92个ST型。以Pgi基因为标准,供试菌株可分出亚群5个,单一群4个,亚群1和亚群2菌株数量较多,亚群1菌株来自5个产烟省(市),此亚群的ST43属于中国主要种群。说明中国烟草野火病菌遗传多态性丰富,烟草品种与病菌组群间不存在关联性。

BASIN-RANGE TRANSITION AND GENETIC TYPES OF SEQUENCE BOUNDARY OF THE QIANGTANG BASIN IN NORTHERN TIBET

The surface of sequence boundary is a negative record. Its recognition largely depends on the physics of the sediments below and above the boundaries, or on the different sedimentary structures are synthetic marks for the sedimentation and tectonic movements in the sedimentary basin. The Qiangtang Basin that is in 5000m above the sea level is located in Northern Tibet. The Lazhulung—Jinshajiang suture zone now bound it to the north and the Bangong—Nujiang suture zone to the south. Three second\|order tectonic units have been distinguished, i.e. North Qiangtang depression, Central rise and South Qiangtang depression from north to south.The Upper Permian Riejuichaka Formation is built up of mudstone and mud\|limestone, which is represented by sediments in seamarsh. The Lower Triassic Kuanglu Formation, which exhibits the structure unconformable contact with the overlying Upper Permian strata, is characterized by terrigenous clastic rocks in the lower area and is carbonate rocks in the upwarding area and the Middle Triassic Kuangnan Formation. The Upper Triassic Xiachaka Formation consisting of terrigenous clastic rocks, carbonates rocks and mixed sediments, is confined to the uplift zones. The lower Jurassic volcanic rocks are deposited in continental rift. The middle and Upper Jurassic Yangshiping Group are conformable contact and assembled by the gypsum\|bearing terrigenous clastic rock formations and carbonate rock formation. The Middle Cretaceous and the Paleocene strata is built up of the terrigenous clastic rock formations.

Method discussion for quick response grey prediction of stronger aftershocks of an earthquake sequence

In this paper, we take occurrence process of early strong aftershocks of a main after shock type′s earthquake sequence as a complex grey system, and introduce predicting method for its stronger aftershocks by grey predicting theory. Through inspection prediction for 1998 Zhangbei M S=6.2 earthquake sequence, it shows that the grey predicting method maybe has active significance for the investigation of quick response prediction problems of stronger aftershocks of an earthquake sequence.