查询词典 cross-cultural study

The conversion boundary of self-incompatibility was researched by sowing by stage. Sunshine of day and temperature was studied critically by investigating leafage and researching traits indoors. The results showed that the daily minimum temperature was the principal factor of affinity conversion and the affinity conversion boundary was 16.5~18.1℃.HE97 was primarily regard as self-incompatible line in this research. The method was by inbreeding and sib HE97, Half the silk of HE97 and Zheng58. Inbreeding and cross have been done simultaneously. The extending condition of pollen tube was observed by dying the silk after pollinating 4 hours. The individuals with pollen tube were observed having seeds, while the individuals without pollen tube were observed having few seeds or no seeds. So this study regard HE97 as sporophytic self-incompatibility .The planting ration of female parent HE97 and male parent 87-1 was 4:1.The nature cross-pollination was studied by the theory of endosperm xenity, the study show that the setting percentage of HE97 was 625%, in which the seed in self was 70% and the seed in hybrid was 30%. This was consistent with the study of silk anatomy structure, then come to the same conclusion: compatible pollen germination and fertilization can stimulate the self-incompatible pollen germination and fertilization in the same corn cob.

通过分期播种，进行了光温敏自交不亲和材料HE97亲和性转换区间的研究，依据田间跟踪调查叶龄及室内考种研究了HE97亲和性转换区间的光温临界值，结果表明：1日最低温度是影响HE97自交不亲和性的主要原因，亲和性转换区间在16.5℃～18.1℃之间。2通过HE97自交和姊妹交以及将HE97与郑58作为双亲，各自的花丝一分为二，分别正反交，授粉后4个小时分别取其花丝进行固定、染色，观察花粉管的伸长情况，根据结实率与花粉管伸长的对应关系，结果发现观察到花粉管的对应植株收获到了种子，而没有观察到花粉管的对应植株结实率极低或没有结实，本研究把HE97初步划为孢子体自交不亲和类型。3以HE97为母本，87-1为父本，按4母：1父行比，通过花粉直感效应研究天然异交率，结果母本HE97结实良好(62%)，其中自交粒占70%，异交粒占30%，结合花丝切片观察表明，亲和花粉的萌发及受精会导致落在同一果穗柱头上不亲和花粉的萌发不再受抑制。

In order to study the intake air flow characteristics in four-valve diesel engines, in this dissertation hot-wire anemometer and PIV twodimension instantaneous measuring technique are used. Extensive experimental study on two intake valve exit flow fields and longitudinal section flow field in cylinder are performed for different type of diesel engines. Great researching progress have been made on the interaction between two intake ports, and the formation process of in-cylinder swirl and flow field structure of cross and longitudinal section for four valve diesel engines. These results are presented in China for the first time and without such kind of research work reported abroad as detailed and deepgoing as this dissertation. The author designs and makes a set of hot wire measuring velocity device to measure the velocity distribution around the intake valve annulus and the cross section flow field in cylinder.

为了研究四气门柴油机进气过程中气体流动的变化规律，本文利用热线测速和PIV二维瞬态测速技术，对四气门柴油机两进气门出口全圆周流速场和缸内横、纵剖面的气体流动流场进行了大量的试验研究，在四气门柴油机两进气道之间相互影响的变化规律，缸内涡流的形成过程及缸内横、纵剖面流场结构等方面取得了重大的研究进展，这一研究工作在国内尚属首次，在国外也未见有如此全面、深入的研究报道。

Methods: This was a cross-sectional study.

本研究采用流行病学现况调查法。

DESIGN: This was a cross-sectional study of 6334 subjects aged 30-60 y.

设计：本研究采用横断面研究设计，共纳入30-60岁的6334名研究对象。

DESIGN: Case-based cross-sectional study based on patients.

设计：以患者为对象的横断面的调查。

A total of 200 strains (z50% gentamicinresistant) from the United States were used for the cross-resistance study including Staphylococcus aureus (110), coagulase-negative staphylococci (CoNS; 50), Pseudomonas aeruginosa (10), Escherichia coli (20), and other Enterobacteriaceae (10) tested against TAO, bacitracin, polymyxin B, neomycin, amikacin, gentamicin, streptomycin, tobramycin, and mupirocin. Fifty gentamicin-resistant isolates from each year (1997–2002) were used to determine the activity of TAO over time. Baseline resistance rates of TAO among 300 Australian isolates (AGARS Program, 2002–2003) were also studied.

来至美国的200株菌株（ z50 ％对庆大霉素有耐药性）用于交叉耐药性研究，其中包括金黄色葡萄球菌（ 110株），凝固酶阴性葡萄球菌（ CoNS ； 50株），铜绿假单胞菌（ 10株），大肠埃希氏菌（ 20 株）和其他肠杆菌属菌（ 10株），检测这些菌对于以下抗生素的耐药性，抗生素为TAO，杆菌肽，多粘菌素B ，新霉素，丁胺卡那霉素，庆大霉素，链霉素，妥布霉素，莫匹罗星。1997到2002年期间每年分离出五十株对庆大霉素有抗药性菌株来确定随时间的变化TAO对其的活性是否有所改变。300株澳大利亚分离的菌株(AGARS Program， 2002–2003)也对TAO的耐药性基准进行了研究。

Methods: Cross sectional study of 387 retinal vessels (193 arterioles, 194 veins) from 28 eyes of 14 children (aged 10 years).

来源于14名10岁儿童的28只眼的387条视网膜血管（193条动脉，194条静脉）的横向研究。

METHODS: This is a cross-sectional study on asthmatic outpatients of three Italian hospitals.

该研究是一项在意大利3个医院哮喘门诊患者中进行的横断面研究。

This cross-sectional study was conducted in two selected Nursing Homes for the elderly in Kuantan, Pahang.

这一跨部门的研究是在两个选择护理中心在彭亨州的老人。

Methods: A cross-sectional study was carried out at a medical center in northern Taiwan. A total of 205 healthy mother-infant pairs were recruited. A tool to assess insufficient milk supply developed by P.D. Hill and S.S. Humenick (1996) was used to gather breastfeeding information during each participant's hospital stay.

采横断面研究设计，於北部某医学中心进行收案，共收案205名健康足月生产之母婴，使用Hill及Humenick所发展乳汁分泌评估工具，於产妇住院期间搜集哺乳资讯。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。