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cold and dry environment
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  寒冷干燥环境
     Methods: The model of gunshot wound at hind limb of rabbits in cold and dry environment was established. General observation and quantitative bacterial analysis were performed at1、3、6、2、24、48、72、96 hours after the injury respectively.
     方法:用40只兔的后肢制作成寒冷干燥环境下枪弹伤模型,对伤后1小时、3小时、6小时、12小时、24小时、48小时、72小时、96小时进行了大体观察和细菌学变化定量检测。
短句来源
     Quantitative Bacteriological Study of Gunshot Wound in Cold and Dry Environment
     寒冷干燥环境下枪弹伤细菌学定量观察
短句来源
     Objective: To investigate the change in quantity of bacteria and the development process and characteristics of the infection after gunshot in cold and dry environment.
     目的:探讨寒冷干燥环境下火器伤细菌定量变化及感染发展过程与特征。
短句来源
     Pathological observation of gunshot wound in limbs of rabbits in cold and dry environment
     寒冷干燥环境下肢体火器伤的病理学观察
短句来源
     QUALITATIVE BACTERIOLOGICAL ANALYSIS OF GUNSHOT WOUND ON LIMBS OF RABBITS IN COLD AND DRY ENVIRONMENT
     寒冷干燥环境中肢体火器伤伤道细菌种类分析
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  寒冷干燥环境下
     Methods: The model of gunshot wound at hind limb of rabbits in cold and dry environment was established. General observation and quantitative bacterial analysis were performed at1、3、6、2、24、48、72、96 hours after the injury respectively.
     方法:用40只兔的后肢制作成寒冷干燥环境下枪弹伤模型,对伤后1小时、3小时、6小时、12小时、24小时、48小时、72小时、96小时进行了大体观察和细菌学变化定量检测。
短句来源
     Quantitative Bacteriological Study of Gunshot Wound in Cold and Dry Environment
     寒冷干燥环境下枪弹伤细菌学定量观察
短句来源
     Objective: To investigate the change in quantity of bacteria and the development process and characteristics of the infection after gunshot in cold and dry environment.
     目的:探讨寒冷干燥环境下火器伤细菌定量变化及感染发展过程与特征。
短句来源
     Pathological observation of gunshot wound in limbs of rabbits in cold and dry environment
     寒冷干燥环境下肢体火器伤的病理学观察
短句来源
     Primary surgical management of gunshot wounds on limbs of rabbits in cold and dry environment
     寒冷干燥环境下肢体火器伤早期三种外科处理的实验研究
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  cold and dry environment
Cones and seeds were larger in stands at higher altitude, possibly adapted to unfavourable (cold and dry) environment.
      
The results confirm the expectation that soil formed in such cold and dry environment on the plateau retained the main geochemical characteristics of the parent materials.
      
The cold and dry environment is a perfect setting to preserve DNA, in or out of the cell, indefinitely.
      


heT terrestrial mollusk fossils preserved in loess sediments are good recorders of paleoclimate and paleoenvironment. They are the only biological remains still existing in large quantities. A new discovery on terrestrial mollusk fossils permits to improve the reconstruction of environments during the last glaciation in Weinan.The studied section is located at Weinan, Shaanxi, of the southern-most part of the Loess Plateau, which is a sensitive area to climatic changes and has an annual average temperature of...

heT terrestrial mollusk fossils preserved in loess sediments are good recorders of paleoclimate and paleoenvironment. They are the only biological remains still existing in large quantities. A new discovery on terrestrial mollusk fossils permits to improve the reconstruction of environments during the last glaciation in Weinan.The studied section is located at Weinan, Shaanxi, of the southern-most part of the Loess Plateau, which is a sensitive area to climatic changes and has an annual average temperature of about 12-13.6℃ and an annual mean precipitation of about 570-620mm. In this study, 22 samples, which were collected with an interval of 10cm from a range of 1.54-3.64 m in depth, were analyzed for fossil mollusk fossils. Each sample weights about 10-12kg. All samples were washed and sieved through a 0.5mm mesh to pick out snail shells. Sixteen species of terrestrial snail fossils were identified: Vallonia costata (Milller), V. tenera (Reinhardt), V. Pulchella (Mller), V. sp., Pupilla aeoli (Hilber), P. sp., Kaliella depressa Moellendorff, Macrochlamys rejecta (Pfeiffer), Gastrocopta armigerella (Reinhardt), Cathaica pulveraticula (Martens), C. pulveratrix (Martens), C. fasciola (Draparnaud),C. sp., C. constaniae (H. Adams), Metodontia yantaiensis (Crosse et Debaux), M.huaiensis (Crosse). A method of correspondence analysis suitable to the mollusk data was used to estimate semiquantitatively the temperature and humidity variations. At the same time this analysis method allows to study both species and assemblages. The results obtained are drawn in a diagram that takes into account the present ecology of mollusk species. Generally, the first major factor is interpreted as "temperature"(ranging from temperate to cold) and second as humidity (ranging from dry to moist) according to the modern ecology of mollusk species. Consequently, the climatic curve could be established using the mollusk fossils identified.Three mollusk fossil zones have been recognized in the Weinan loess section.which represent three different environments in the last glaciation:Mollusk Zone I(3.64-3.04m and 23 000-19 900 aB.P.) M. rejecta was the dominant species in the whole snail fossil assemblage, which is one of the typical representatives of thermophilus and humidiphilus species and is distributed mainly in the south part of China now. Its luxuriant appearance in the Weinan section implies that the condition during that time was relatively warm and moist. K.depressa and M. huaiensis associated with it were two kinds of thermohumidiphilus snail species. However, there exists a certain amount of P. aeoli and V. costata in the section, implying a short-time condition of dry and cold climate. The study of phytolith and spore-pollen indicates that small shrubs and herbs were predominated in the vegetation of this period. In these environmental conditions, weakly-developed paleosol changed into loess. During 21 900-19 900 a B.P.,the amount of M. rejecta decreased dramatically, while that of P. aeoli increased gradually. In addition, G. armigerella and C. pulveratrix appeared at the first time:the former is an aridiphilus and simi-aridiphilus component; the latter is a coldaridiphilus one. Therefore, Weinan during 23 000-21 900 a B.P. underwent the change of a relatively mild and moist climate to a colder and drier climate. Meanwhile, the semijarid-semihumid loess steppe was developing to the dry steppe and the desert steppe.Mollusk Zone II (3.04-2.04m and 19 900-14 700 a B.P.) P. aeoli, a species distributed extensively in the Paleoarctic region now, was a predominant element in the Weinan mollusk fossil assemblage. There are also V.costata, another drought-enduring and cold resistant species, and C. pulveratrix.These species indicate a rather cold and dry environment. Perhaps, it could be a desert steppe appeared during the peak of the last glaciation.Mollusk Zone III(2.04-1.54m and 14 700-12 300 a B.P.)The zone is distinguished both by a marked decline in P. aeoli and a contemporaneous increase in V.tenera and by considering M. reiecta an

通过对关中盆地渭南地区晚冰期时黄土地层中陆生软体动物──蜗牛化石的系统研究,划出了3个蜗牛化石组合带,代表了3种不同的气候环境。通过对22个黄土样品中的蜗牛化石组合、14种蜗牛化石含量的对应分析,建立了晚冰期时的气候因子变化曲线,与植物硅酸体研究结果比较,两者有很好的一致性。晚冰期时,渭南地区的气候经历了温凉、偏湿-寒冷、干旱-短暂变暖-冷、干的变化过程,环境经历了半干旱、半湿润草原-干旱草原、荒漠草原-干旱草原的发展过程。在14000aB.P.前后有一气候转暖期,预示着黄土高原末次冰消期气候转暖的开始。

The leaf anatomy and ultrastructure of Chenopodium glaucum ,a pioneer plant on the salinized wetland of Qinghai Lake,were studied and compared with those collected from the mid surrounding of Lanzhou University under LM and TEM.The thin leaf blades,evident differentiation of plasiade and spongy parenchyma and well developed grana thyloid and starch grains within the chloroplasts were commonly found in the plant leaves from the mid surrounding.However,thicker leaf blades,cuticula with epidermal hairs and...

The leaf anatomy and ultrastructure of Chenopodium glaucum ,a pioneer plant on the salinized wetland of Qinghai Lake,were studied and compared with those collected from the mid surrounding of Lanzhou University under LM and TEM.The thin leaf blades,evident differentiation of plasiade and spongy parenchyma and well developed grana thyloid and starch grains within the chloroplasts were commonly found in the plant leaves from the mid surrounding.However,thicker leaf blades,cuticula with epidermal hairs and more obvious substomatic chamber were observed in the samples from the salinized wetland.The leaves of the salinized surrounding belong to the typical isolateral leaf.In addition,at the ultrastructure scale,more mitochondria with poorly developed cristae,more boat shaped chloroplasts distributed at the edge of cell wall with poorly developed grana thyloid and sufficient lipid droplets,and more compound annulate lamellae in some cells were detected.The comparison indicated that a great habitat variation did occur between these two ecotypes of chenopodium glaucum and those growing in salinized wetland exist an obvious evolutional trend to adapt the cold and dry environment.

利用光学显微镜和透射电镜对生长于青海湖湖滨盐碱湿地的先锋植物灰绿藜(Chenopodium glaucum Linn.)及生长于甘肃兰州大学校园内中生环境对照灰绿藜叶片的显微、超微结构进行了比较观察研究。结果发现中生环境灰绿藜叶片较薄 ,有明显的栅栏与海绵组织分化 ;叶绿体呈椭圆形 ,基粒片层较发达且普遍含有淀粉粒。与对照相比 ,生长于高海拔湖滨盐碱湿地灰绿藜叶为等面叶 ,叶片厚 ,角质层厚 ,栅栏组织发达 ,气室明显 ,具表皮毛 ;线粒体较多 ,但嵴不发达 ,叶绿体呈扁船型沿着壁的边缘排列 ,叶绿体的基粒片层不发达且普遍含有脂质球 ,一些细胞中常出现大量的多层膜结构。研究结果表明 2种生态型灰绿藜的形态结构已发生了深刻的变异 ,湖滨灰绿藜表现出适应区域的寒旱化的明显特征

Objective: To investigate the pathological changes of the tissues in gunshot wound in cold and dry environment. Methods:The model of gunhot wound was established at hind limbs of 30 rabbits in cold and dry environment. General observation, optical microscopy(OM) and electron microscopy(EM) were performed at 1,3,6,12,24 and 48 h after the gunshot injury respectively. Results:All of wound track were penetrating wound. 12 to 24 hours subsequent to the gunshot injury, the wound limbs were swelling,...

Objective: To investigate the pathological changes of the tissues in gunshot wound in cold and dry environment. Methods:The model of gunhot wound was established at hind limbs of 30 rabbits in cold and dry environment. General observation, optical microscopy(OM) and electron microscopy(EM) were performed at 1,3,6,12,24 and 48 h after the gunshot injury respectively. Results:All of wound track were penetrating wound. 12 to 24 hours subsequent to the gunshot injury, the wound limbs were swelling, and there were obvious necrosis tissue and hematoma in wound track, the little secretion were observed in wound track at 48 h after injury. Under OM and EM, the necrosis and damage of the muscle fibers were lighter in cold and dry environment than in normal environment, which deteriorate gradually with the lapse of time after the injury, there were remained alive muscle tissues in deep layer of the coutusion area. Conclusion:Pathological change of tissues in the gunshot wound were lighter in cold and dry environment than in normal environment, and the signs of infection came later. It was suggested that the debridment of the gunshot wound can delay from 12 h to 24 h after the injury in cold and dry environment.

目的 :通过动物实验方法 ,探讨寒冷干燥环境下火器伤的病理变化特点 ,为临床救治提供理论基础。方法 :将 30只新西兰大白兔一侧后肢枪击 ,于伤后 1、3、6、12、2 4、4 8h进行大体和光镜、电镜的病理形态学观察。结果 :所有伤道均为贯通伤 ,伤后 12~ 2 4h肢体肿胀 ,伤道内有较多坏死组织和凝血块 ,伤后 4 8h伤口有少量分泌物 ;光镜和电镜观察示寒冷干燥环境下伤道病理形态学改变随伤后时间的推移呈进行性加重 ,但明显轻于常温常湿条件下 ,挫伤区深层还残存有部分成活肌组织。结论 :寒冷干燥环境下肢体火器伤与常温常湿条件相比 ,其感染出现晚、病理变化轻 ,因此 ,救治时不应过分强调彻底清创 ,且其清创时限可适当延长到 12~ 2 4h。

 
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