设施根结线虫发病与未病土壤真菌多样性比较

为了了解设施番茄根结线虫发病与未发病土壤真菌多样性差异,本实验分别对设施番茄发病、未发病老棚以及未发病新棚的土壤采样,利用高通量ITS方法测定土壤真菌多样性。结果表明,设施番茄根结线虫发病与未发病土壤真菌多样性不同,在界门水平上,真菌界相对丰度为100.00%,发病与未发病土壤差异不显著;共检测出2个菌门,未发病老棚土壤的Basidiomycota/担子菌门为未发病新棚的9.69倍;共检测出5个菌纲,未发病老棚Leotiomycetes/锤舌菌纲和Agaricomycetes/伞菌纲为未发病新棚的5.32倍和10.04倍,发病土壤与未发病老棚土壤的Dothideomycetes/座囊菌纲为未发病新棚的17.84倍和22.87倍;共检测出9个菌目,发病土壤与未发病老棚土壤的Pleosporales/腔菌目绝对丰度为未发病新棚的17.84倍和22.87倍;共检测出13个菌科,发病土壤Psathyrellaceae/水蕨科绝对丰度为未发病新棚的9.13倍,未发病老棚Inocybaceae/丝盖伞科绝对丰度为未发病新棚的4.81倍;共检测出7个菌属,发病土壤Coprinellus/鬼伞属为未发...     

揭开病毒的神秘面纱(3)

机体的免疫反应机体被病毒感染后是否一定发病呢?答案是否定的。是否发病取决于病毒、机体和环境因素三者的综合作用。首先,对病毒本身来讲,构成病毒感染和发病的重要因素包括病毒的致病性、毒力     

阿尔茨海默病发病机理的研究进展

阿尔茨海默病(Alzheimer’s disease,AD)病因及发病机制尚未完全阐明,有关其发病机制有β-淀粉样蛋白假说、Tau 蛋白假说、炎症学说和氧化应激学说等多种.本文就现有较公认的发病机制研究进展作一综述.     

基于ARIMA模型的传染病疫情计量研究

通过自回归移动平均模型(ARIMA)曲线拟合乙型肝炎疫情的发病数,以此为依据对传染病行业的需求进行分析和预测。选择2009～2018年乙型肝炎发病数据,通过时间序列分析法进行处理,采用序列平稳化、模型估计、模型检验拟定ARIMA季节性模型。并使用2013年1月-2016年12月我国乙型肝炎发病数据来进行模型验证,再预测未来一年的乙型肝炎月发病数,可得知2009-2018年乙型肝炎的发病数据可以被ARIMA(3,1,2)(1,1,1)12模型很好地拟合。根据模型预测得到,2019年我国乙型肝炎的发病数为1224591例,总体呈上升趋势,在3、7、8月份逐月增加,随后又有所减少。     

煤矿职业危害及防治研究

煤炭行业职业危害以粉尘造成的尘肺病最为严重。尘肺病是一种不可逆转的职业病,一旦发病往往就是灾难性的、难以治愈,只能用药物来控制病情的恶化。针对煤矿职业病发病现状及发病原因进行分析研究。     

608例脑卒中发病的时间分析

目的 :探讨张家口地区脑卒中发病的时间分布规律。方法 :圆分布分析。结果 :张家口地区脑卒中发病呈全年普遍高发 :2月、4月、10月出现三个高峰 ,7～ 8月呈平台样持续高发。结论 :张家口地区脑卒中发病存在地域特殊性。     

脑卒中发病环境因素分析及干预

本文以发病时间为统计指标,以诊断时间为辅助．首先运用Excel、SPSS软件以直方图的形式从横向和纵向两个层面对脑卒中发病人群进行了统计描述．其次,利用MatLab程序构建了多元回归模型,并以立体切片图形式直观展现了脑卒中发病率与气温、气压、相对湿度间的关系．最后,阐述了脑卒中发病的危险因素、发病前的预警信号与预防措施以及对高危人群提出了预警和干预的建议方案．     

婴幼儿手足口病可防治

手足口病是由多种肠道病毒引起的以发热和手、足、口腔等部位出现皮疹或疱疹为主要特征的常见传染病,以5岁以下儿童尤其是婴幼儿发病为主。该病是一种全球性传染病,世界许多国家和地区均曾发生此病的流行。本病一年四季均可发病,但以潮湿高温季节多见,冬季发病较少。该病流行期间,可发生幼儿园和托儿所集体感染和家庭聚集发病现象。     

缺血性脑血管病治疗时机和临床预后关系的回顾性研究

目的：研究缺血性脑血管病发病后的不同治疗时机和临床预后的关系.方法：收集2005年1月至2007年5月在我科入住的缺血性脑血管病病人1272例,其中短暂性脑缺血发作患者271例,急性脑梗死患者1001例,然后按照发病时间的长短分为7组：发病3h内组;发病3-6h内组;发病6-12h内组;发病12-24h内组;发病3天内组;发病3-7天内组;发病7天以上组,各组均应用常规方法治疗,进行统计学分析,探讨比较其临床预后与治疗时机的关系.结果：以入出院患者的入出院症状、体征、影像学变化为评判标准判断预后,各组别之间相互比较发现,各组间临床预后与治疗时机差异有统计学意义（p〈0.05）,各组间预后情况的比较无统计学意义（p〉0.05）,死亡率在各组间无明显差别（p〉0.05）.结论：急性脑梗死患者的不同治疗时间和临床预后有关,来院时间越早,其临床预后越好,尤其对发病时间较短的就诊患者其远期预后的干预意义深远.     

脑卒中发病率与性别、发病月份、发病年龄段的关系

对脑卒中的发病人数进行统计分析,掌握疾病发病率的规律。分别对不同性别、月份、年龄段的发病人数作统计描述后得出如下结论：男性脑卒中的发病率普遍高于女性,且发病人数有逐年增长的趋势;脑卒中的发病率随季节的变化而变化,高温和低温都是诱发脑卒中发病的重要因素;脑卒中的发病率随着年龄的增长而增大,且在中老年人群中具有很高的发病率。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

The Reader Response Approach to Teaching of English Literature

During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context.