排序方式: 共有25条查询结果,搜索用时 453 毫秒
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目的:探讨急性脑梗死患者血清心肌酶学变化与预后的关系及导致急性脑梗死患者心肌酶学变化的相关危险因素。方法:回顾性分析临床及影像资料齐全且确诊的140例急性脑梗死患者(发病14天内),根据有无血清心肌酶学升高分为血清心肌酶学升高的急性脑梗死组A组(43例),血清心肌酶学正常的急性脑梗死组B组(97例),应用美国国立卫生研究院卒中量表评分(NIHSS)比较两组神经功能缺损情况,并对两组病人血清心肌酶学(包括天冬氨酸氨基转移酶(AST)、肌酸激酶(CK)、肌酸激酶同工酶(CK-MB)、乳酸脱氢酶(LDH)、血糖、血脂、纤维蛋白原和血压等结果进行分析。结果:A组(31%)患者血清心肌酶学均增高,与B组比较均有显著性差异(P〈0.01);发病后1天A、B两组患者临床神经功能缺损程度评分无显著性差异,发病后4、8、10天A、B两组患者临床神经功能缺损程度评分有显著性差异(P〈0.01);A组高血压、糖尿病与B组比较有显著性差异(P〈0.05);而血脂及纤维蛋白原两组比较无显著性差异。结论:急性脑梗死患者血清心肌酶学升高者预后不良;高血压、糖尿病是急性脑梗死患者血清心肌酶学升高的相关危险因素。 相似文献
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Yao-Jun Chang Yu-Fen Cao Jin-Mei Zhang Lu-Ming Tian Xing-Guang Dong Ying Zhang Dan Qi Xiao-shuang Zhang 《Tree Genetics & Genomes》2017,13(2):44
Eight pairs of chloroplast DNA (cpDNA) universal primers selected from 34 pairs were used to assess the genetic diversity of 132 pear accessions in Northern China. Among them, six amplified cpDNA fragments showed genetic diversity. A total of 24 variable sites, including 1 singleton variable site and 23 parsimony informative sites, as well as 21 insertion-deletion fragments, were obtained from the combined cpDNA sequences (5309–5535 bp). Two trnL-trnF-487 haplotypes, five trnL-trnF-413 haplotypes, five rbcL haplotypes, six trnS-psbC haplotypes, eight accD-psaI haplotypes and 12 rps16-trnQ haplotypes were identified among the individuals. Twenty-one haplotypes were identified based on the combined fragments. The values of nucleotide diversity (Pi), average number of nucleotide differences (k) and haplotype diversity (Hd) were 0.00070, 3.56408 and 0.7960, respectively. No statistical significance was detected in Tajima’s D test. Remarkably, the important cpDNA haplotypes and their representing accessions were identified clearly in this study. H_19 was considered as one of the ancient haplotypes and was a divergent centre. H_16 was the most common haplotype of the wild accessions. H_2 was the haplotype representing the most pear germplasm resources (46 cultivars and two wild Ussurian Pear accessions), followed by haplotype H_5 (30 cultivars, two wild Ussurian Pear accessions and four sand pears in outgroups) representing the cultivars ‘Dangshan Suli’ and ‘Yali’, which harbour the largest and the second largest cultivation areas in China. More importantly, this study demonstrated, for the first time, the supposed evolution routes of Pyrus based on cpDNA divergence in the background of pear phylogeny in Northern China. 相似文献
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The species composition, diversity, and abundance of lianas were studied in four secondary forests (a 100-year-old forest,
a middle-aged forest, and two younger secondary forests), and compared with an undisturbed primary forest in the Ailao Mountains
of subtropical SW China. The results showed that the species composition of lianas differed greatly from the secondary forests
to the primary forest, which exhibit early and late-successional species. The abundance of lianas was relatively higher in
the two younger and middle-aged secondary forests than in the old-growth secondary and primary forests. However, liana species
richness was very limited in the four secondary forests as compared to the primary forest. Root climbers mainly grew in the
primary forest, whereas tendril and hook climbers predominated in the four secondary forests, while stem twiners were common
in both. The majority of lianas recorded in this study reproduced by animal dispersal, and there was no variation in dispersal
modes across the five forest types. A step-wise regression showed that the abundance of small lianas (dbh <4 cm) was positively
correlated with the abundance of small- and medium-sized tree stems and negatively correlated with the abundance of large-sized
tree stems, whereas there is a strong positive correlation between the abundance of large lianas (dbh ≥4 cm) and large tree
stems. Results from the CCA indicate that canopy openness, soil moisture, and average canopy height were the most important
factors that influenced the abundance and distribution of lianas. 相似文献
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目的:评价终末期肾病行透析治疗患者的疲劳,探讨疲劳的影响因素及其与生活质量之间的相关性。方法:采用自行设计的患者一般情况调查问卷、多维疲劳量表MIF-20、健康状况问卷量表SF-36对204例ESRD进行血液透析与腹膜透析治疗的患者进行调查,分析治疗效果差异之间的相关因素。结果:204例透析患者的疲劳总分为60.47+11.75;经多元线性逐步回归分析透析患者疲劳的主要相关因素为年龄、文化程度、经济状况;除疲劳的活动减少与生活质量的躯体疼痛、情感职能无显著相关外,两者总分及各维度之间均呈显著性负相关。结论:终末期肾病透析患者存在重度疲劳;临床上重视患者的疲劳评估,进行有效干预,提高患者生活质量。 相似文献
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Lu Zhuo Yi-gong Zhang Xiao-shuang Li Hong-lan Yang Kai-yun Guan Andrew J. Wood 《Journal of bryology》2018,40(3):265-270
Fragments of the desert moss Syntrichia caninervis Mitt. were grown on the surface of moistened sand to assess their regeneration capacity. The plant material was collected in two different years (2014 and 2015) and divided into five fragment classifications (stem apices, green leaves, yellow-green leaves, brown leaves and stems). All fragments of the stem apices, green leaves and stems regenerated within 10 days of culture while some fragments of yellow-green leaves (two 2014 fragments and one 2015 fragment) and brown leaves (three 2014 fragments and three 2015 fragments) died. Fragments of stem, stem apices and green leaves regenerated more quickly, produced longer protonemata and more shoots as compared to fragments of yellow-green and brown leaves. These differences were statistically significant but there was no difference in regeneration between the fragments from 2014 and 2015. Differential regeneration and proliferation of different plant fragments has important implications for the clonal propagation of S. caninervis in the Gurbantunggut Desert. 相似文献
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哀牢山湿性常绿阔叶林及不同类型次生植被的幼苗更新特征 总被引:4,自引:0,他引:4
采用"空间代替时间"的方法,对云南哀牢山徐家坝地区湿性常绿阔叶林及不同类型次生植被中木本植物幼苗的种类组成、数量及更新方式等进行了调查.结果表明:在所有调查样地中,共记录到木本植物幼苗46种,其中乔木31种、灌木15种.荒草地、滇山杨林、栎类萌生林、原生林4种不同植被类型的幼苗密度分别是(421.9±59.5)、(34.4±8.1)、(31.6±7.2)、(18.5±6.6)株·25 m-2.随着演替的进行,灌木的比例逐渐减小,乔木的比例则逐渐增加.在森林恢复演替过程中,处于演替初期的荒草地灌木萌生更新占优势,到了演替后期则以乔木萌生幼苗更新为主.随着群落演替进程的增加,幼苗密度逐渐减少,幼苗生活型和木本植物的幼苗更新方式均发生变化. 相似文献
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生物多样性的熵值结构 总被引:3,自引:0,他引:3
多样性一般定义为生物进化过程中物种表现型的丰富程度。从广义上讲,生物进化与环境归类作用的结构复杂性对生物为多样性的解释是很有益处的。我们认为区域水平与样地水平上的气候归类型与植被归类型是最基本的划分因子,本文以中国东北部黑龙江省的山地植被为例,采用多等级熵值分配的方法来证明所使用的方法。我们得出气候归类型与植被归类型所占有的熵值成分要弱于物种表现型丰富度所占有的熵值成份。值得注意的是其相对的熵值贡献率对每一个因子的最大熵值的变化规律。分析结果表明气候归类型占有较低的熵值而植被归类型占有较高的熵值。因此仅仅以在区域气候型为主要指标所划分的物种生态位是不够的,而以小区域内的植被型为指标所产生的物种生态位具有较高利用价值。 相似文献
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