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辐射     
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  radiation
    Study on Protect and Repairer Role of the Lsatis Indigotica Seedlings Damaged by Enhanced UV-B Irradiation and Mechanism with He-Ne Laser Radiation
    He-Ne激光对增强UV-B辐射损伤菘蓝幼苗的防护、修复效应及机理研究
短句来源
    Combined Effects of Enhanced UV-B Radiation and Enriched CO_2 on Marine Microalgae
    海洋微藻对UV-B辐射增强与CO_2加富共同作用的复合响应
短句来源
    Study on the Molecular Mechanism in Alpine Plant Response to Cold-stress and UV-B Radiation Stress
    高寒植物对低温和强UV-B辐射胁迫响应的分子机制研究
短句来源
    The Experimental Ecology Studies on Responses of Marine Microalgae to UV-B Radiation Enhancement
    海洋微藻对UV-B辐射增强响应的实验生态学研究
短句来源
    Effects of UV-B Radiation on Experimental Population Dynamics and Interspecific Competition of Two Species of Marine Rotifers (B. Plicatilis & B. Urceus)
    二种海水轮虫(B. plicatilis & B. urceus)实验种群动态和种间竞争对UV-B辐射增强的响应
短句来源
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  irradiation
    Study on the Adaptation to UV-B Enhancement and Active Substances Against Ultraviolet Irradiation of Antarctic Ice Microalga
    南极冰藻对UV-B辐射增强的适应性及其抗紫外线辐射活性物质的研究
短句来源
    Study on Protect and Repairer Role of the Lsatis Indigotica Seedlings Damaged by Enhanced UV-B Irradiation and Mechanism with He-Ne Laser Radiation
    He-Ne激光对增强UV-B辐射损伤菘蓝幼苗的防护、修复效应及机理研究
短句来源
    A REPORT OF WHEAT VARIATION INDUCED BY MICROWAVE IRRADIATION
    微波辐射诱发小麦变异的报告
短句来源
    Studies on DNA Synthesis of Micronuclei Induced by Irradiation Using Microautography Ⅰ. The Effects of Different Doses
    应用显微放射自显影技术对辐射诱发的微核合成DNA研究——Ⅰ.不同照射量的效应
短句来源
    IRRADIATION PRESERVATION STUDY ON BEIJING ROAST DUCK
    北京烤鸭的辐射保鲜研究
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  radiate
    All mice were injected into abdominal cavity with A's abdominal juice cancer cell(1×106/ml,0.2 ml). MMW(36GHz,0.73~1.46 mW/cm2)were used to radiate the back of mice in radiation group,qd×8d.
    两组小鼠腹腔接种浓度为1×106/ml的小鼠艾氏腹水癌细胞0.2ml,接种后当天开始,辐射组用频率36GHz,功率密度0.73~1.46mW/cm2毫米波辐射小鼠背部30min,1次/d,连续8d。
短句来源
    VP of willow stem phloem transmit horizontlly from xylem to thin wall cell and thin wall cell radiate out.
    柳茎韧皮部(树皮)表面记录到的变异电波是从木质部横向通过薄壁细胞向外辐射传递的结果.
短句来源
    The aim of this article is to present the recent research development about the radiolarian faunas during the Permian Triassic transition Over 90% of the late Changxingian radiolarian species disappeared at the end Permian and only a few species that could be found in both shallow limestones and pelagic cherts survived successfully into the Triassic The survival period spans Griesbachian to Smithian and the recovery period, Spathian, and Radiolaria began to radiate from Anisian stage The radiation of the Middle Triassic radiolarians was intensively controlled by anoxia event
    综述了二叠 -三叠纪转折期放射虫动物群的研究进展 ,长兴阶晚期放射虫动物群 90 %以上的种在二叠纪末期灭绝 ,只有少数在浅海灰岩和远洋硅质岩中均能够发现的属种才成功残存到三叠纪 ; 三叠纪放射虫的复苏和辐射经历了较长的过程 ,Griesbachian至 Smithian为放射虫残存期 ,Spathian 为放射虫的复苏期 ,Anisian是放射虫的辐射期。
短句来源
    Methods:In this study,we used He-Ne laser to radiate the skin on waist and back of mice,to investigate its effects on dcontents of NO 2 and cGMP in cerebellum,seventy two BALB/C mice were randomized into control group,pst-radiation (PR) 0h group,PR 1h group,PR 2h group,Inhibior+PR 0h group,inhibitor+PR 1h group,Radiation group were locally radiated once daily (1h),for 5d.
    方法 :采用雄性BALB/C小鼠 ,随机分为对照组 ,辐射后即刻组、1h组、2h组 ,注入氮氖合酶 (NOS)抑制剂的辐射后即刻组、副射后 1h组 ,用波长 6 32 .8nm、功率密度 5mW /cm2 连续氦氖激光每天局部辐射 1次 ,每次 1h ,连续 5d。 对照辐射功率密度为 0。
短句来源
    Method 18 New Zealand rabbits were equally divided into 3groups according to the different radiated dosage. We used 35GHz millimeter wave to radiate the raddit's eyes for 1 hour. The power densities were 35mW/cm2.The visual electrophysiological functions were tested before and after radiation at various times.
    方法新西兰兔18只,分为3组,即35mW/cm2组、10mW/cm2组、假照射组,采用35GHz的等幅连续波辐射兔眼1h,分别于辐射前、后不同时间测试视网膜电图(F-ERG)及视觉诱发电位(F-VEP)。
短句来源
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  radiatio
    Conclusion: Electromagnetic radiation of cellular telephone does some damage to lymphocytes, causes immogbbulin reduced, the contents of in duces immune function decreaces and the correlation existed between the radiatio n times and immune function.
    结论 :移动电话电磁辐射确实损伤淋巴细胞及其亚群 ,引起免疫球蛋白含量降低 ,至使免疫功能下降 ,并且与辐射时间呈正相关关系
短句来源

 

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      radiation
    The cosmic microwave background (CMB) is a relic radiation of the Big Bang and as such it contains a wealth of cosmological information.
          
    In this paper, a new method of boundary reduction is proposed, which reduces the steady-state heat transfer equation with radiation.
          
    Sr2CeO4/Ln3+ (Ln = Er, Ho, Tm) phosphors were synthesized with the microwave radiation method for the first time.
          
    Effect of random surface errors on radiation characteristics of the side-fed offset Cassegrain antenna
          
    In this paper the average power pattern of the side-fed offset Cassegrain (SFOC) dual reflector antenna is analyzed, and the effect of the random surface error on radiation characteristics of the antenna is introduced.
          
    更多          
      irradiation
    But when it was irradiated under UV illumination or solar irradiation for some time, the catalyst could be reused without loss of catalytic activity.
          
    N-Methyl-2-(N-ethylcarbozole)-fulleropyrro lidine and N-methyl-2-(4'-N,N-diphenylaminophenyl)-fulleropyrrolidine were synthesized by 1,3-dipolar cycloaddition under microwave irradiation, which were characterized by MS, 1H NMR, IR and UV-Vis.
          
    The photocatalytic degradation of methyl orange (MO) in aqueous solution under 365 nm irradiation on TiO2 and Ag/TiO2 thin films was investigated.
          
    The photocatalytic degradation of phenol showed that under visible light (λ >amp;gt; 400 nm) irradiation, the chlorine-doped TiO2 calcined at 300°C displayed the best performance, the degradation ratio of phenol was 42.5% after 120 min.
          
    Photocatalytic degradation of methylene blue on Fe3+-doped TiO2 nanoparticles under visible light irradiation
          
    更多          
      radiate
    We explore the possibilities for detecting pulsars that have ceased to radiate in the radio band.
          
    Radially pulsating stars are shown to radiate fast and slow magnetoacoustic waves into the interstellar gas.
          
    At least two sources radiate in the wavelength range 1.25-5 μm: a hot source whose radiation shows up in the range 1.25-1.65 μm and a cold source radiating at long wavelengths (2.2-5 μm).
          
    The cocoons, which radiate in thermal methanol and CS lines, correspond to the centers of mass in the maser sources + dense molecular core systems.
          
    Since the air molecules excited by relativistic runaway electrons radiate primarily in the red spectral region, this experiment can be considered as a model of high-altitude atmospheric discharges, known as "red sprites."
          
    更多          
      其他


    1. This article reports the observations of the early (5, 30, 60 minutes and 6 hours) reactions of the male germ cells of the white mice to a single dose and whole-body irradiation. The conditions of irradiation are: voltage, 140 kvp; current, 11 ma; dose rate, 100 r/min.; distance, 46 cm; and the effective dosage, 600 r. As fixative we use FAA and the paraffin sections are stained with method of Feulgen reaction, counterstaining with fast green.2. In the sections of the testes fixed at the intervals of 30 and...

    1. This article reports the observations of the early (5, 30, 60 minutes and 6 hours) reactions of the male germ cells of the white mice to a single dose and whole-body irradiation. The conditions of irradiation are: voltage, 140 kvp; current, 11 ma; dose rate, 100 r/min.; distance, 46 cm; and the effective dosage, 600 r. As fixative we use FAA and the paraffin sections are stained with method of Feulgen reaction, counterstaining with fast green.2. In the sections of the testes fixed at the intervals of 30 and 60 minutes after irradiation we observed within the seminifereous tubules the germ cells of different developmental stages having various reactions: (a) the spermatogonia may form the chromosomal bridges at the anaphase of mitosis; (b) the spermatocytes at the growth period may undergo pycnosis, nuclear swelling, reversion of pachytene nucleus to the resting state, or formation of syncytia; at the time of meiosis, they either form chromosomal bridges, possess irregularly distributed chromosomal clumps, or die at the stopped metaphase; (c) the spermatids and the developing sperms may appear pycnotic, undergo nuclear or cytoplasmic vacuolization, form syncytia, or enclose one or more anormalous nuclei, resulting from the lag or abnormal development; (d) the mature sperm, the Sertoli cells, as well as the interstitial cells are not affected. 3. The cells of the same stage are subjected to the various degrees of radiation injury and the mode of their reactions is also various.4. The problems, such as the cellular radiosensitivity, the mitosis and the expression of the radiation effects, and the action of radiation on cytoplasm and nucleus, are tentatively discussed.

    1.本文系报告用X射线一次全身照射小白鼠以观察其睾丸中生殖细胞对600伦X射线照射后的早期(5分钟、30分钟、60分钟、6小时)反应。照射条件为:电压140千伏,电流11毫安,出射率100伦/每分钟,距离46厘米,有效剂量600伦。固定剂用FAA;用孚尔根反应着色,快绿作补染。 2.在照射后30分钟及60分钟固定的睾丸制片中观察到精小管内不同发育阶段的生殖细胞有各种反应:(1)精原细胞在分裂后期形成染色体桥;(2)精母细胞在生长期呈固缩,核胀大及返回休止态,组成合胞;在分裂时形成染色体桥,染色体凌乱分布,中期滞死等等;(3)精子细胞与发育中的精子表现固缩,胞核或胞质空泡化,形成合胞,核畸形(变态延缓或失常);(4)成熟的精子,支持细胞和间隙细胞不受影响。 3.同一发育阶段的细胞受到射线的伤损程度不同,反应的方式亦不一致。 4.对于细胞的辐射敏感性,有丝分裂与辐射效应的表现,以及辐射作用对于胞质和胞核的影响等问题作了初步的讨论。

    1. This paper presents the results of the observations on the quantitative and morphological changes of the various types of cells in the testes of the monkey, Macaca mulatta, which were exposed to 200 r-units of X-irradiation. For the purpose of conipar- ison, the testes were each separately taken out at different intervals after irradiation as follows: 5, 10, 20, 30, 40, 50 and 60 days. 2. The radiosensitivity of the cells at different stages of spermatogenesis was found to be in close conformity With...

    1. This paper presents the results of the observations on the quantitative and morphological changes of the various types of cells in the testes of the monkey, Macaca mulatta, which were exposed to 200 r-units of X-irradiation. For the purpose of conipar- ison, the testes were each separately taken out at different intervals after irradiation as follows: 5, 10, 20, 30, 40, 50 and 60 days. 2. The radiosensitivity of the cells at different stages of spermatogenesis was found to be in close conformity With the similar experimental data obtained in the rodents as previously reported by other authors. The degree of radiosensitivity appears to be in inverse relationship with the progress of maturation, that is, it is highest in the spernia- tegonial stage and becomes lowered gradually in the order of primary spermatocytes, secondary spermatocytes and spermatids down to sporniatozoa, which prove to be least sanasitive. In as early as the 5th day after irradiation, however, the counts of sperinatids amd spermatozoa also showed some sign of decrease in number as compared to the cont-rols, indicating that they are likewise sensitive to some extent. Besides, the seminiferous tubules evidently underwent shrinkage, as a result of which the number of Sertoli cells per cross section unit arou appeared to increase correspondingly, though such cells rarely multiply. That there exists such an apparent relationship between the reduction in the number of germ cells on one hand and the shrinkage of sominiferous tubules with the corresponding increase in the number of Sertoli cells on the other may be taken as a useful index of radiosensitivity. 3. The data on the quantitative chinges relative to the cells at different stages of spermatogenesis at variousintervals after irradiation are suggestive also of a phenomenon of synchronization Whether this is due to the direct lethal effect of X-rays on the spermatogonial cells or to the inhibition of the mitotic divisions can not be ascertained as yet, until when the data on the effect of X-rays upon the different types of spermato- genial cells(type A, iniermediate type and type B) and on the exact stage at which nuclear aberrations occur be available. There exists, however, an apparent heterogeneity in radiosensitivity and in ability to recover between the different parts of seminiferous tubules and among the cells in the different regions of the sarue lumen. 4. The decrease in the total number of cells inclusive of spermatozoa reached to a minimum at the 40th day after exposure to X-irradiation, and the observations on the 50th and 60th day specemens showed that the number ceased to decrease and in fact tend to recove. Hence, it is reasonable to infer that the completion of a single cycle of sper-matogenesis in the monkeys probably takes about 50 days.

    1.本实验以弥猴(Macaca mudatta)为材料,用200侖X-射线直接照射睾丸后,在照射后第5,10,20,30,40,50和60天取出睾丸观察各类细胞的数量与形态变化。 2.本文证实了弥猴生殖细胞的辐射敏感性与(?)齿动物的实验结论大体相符。精子发生各个阶段的辐射敏感性随着生殖细胞的成熟而逐渐递减。但在200命X-射线照射后第5天时,精细胞及精子的数量亦开始下降,同样表现有相当程度的敏感性。此外,照射后的精细管呈现出紴缩,因而,支持细胞就相应地增多。在生殖细胞数量减少,精细管切面直经缩小以及支持细胞数量增多三者之间有平行的关系,可以作为幅射效应的一个指标。 3.观察照射后不同天数的各类生殖细胞胞的数量变化,可以看到增减的同步现象。这主要是由于幅射对精原细胞的武接致死效应,还是抑制有丝分裂所造成的,由于我们没有深入分析各种类型的精原细胞,也没有研究畸变等出现在有丝分裂那一时期,所似对之还不能作出肯定的结论。同时我们发现精细管的各个部份和精细管腔内各个区域的辐射敏感性和恢复能力存在着导质现象。 4.200侖X-射线直接照射弥猴睾丸后,第40天时细胞总数及精子均降到最低...

    1.本实验以弥猴(Macaca mudatta)为材料,用200侖X-射线直接照射睾丸后,在照射后第5,10,20,30,40,50和60天取出睾丸观察各类细胞的数量与形态变化。 2.本文证实了弥猴生殖细胞的辐射敏感性与(?)齿动物的实验结论大体相符。精子发生各个阶段的辐射敏感性随着生殖细胞的成熟而逐渐递减。但在200命X-射线照射后第5天时,精细胞及精子的数量亦开始下降,同样表现有相当程度的敏感性。此外,照射后的精细管呈现出紴缩,因而,支持细胞就相应地增多。在生殖细胞数量减少,精细管切面直经缩小以及支持细胞数量增多三者之间有平行的关系,可以作为幅射效应的一个指标。 3.观察照射后不同天数的各类生殖细胞胞的数量变化,可以看到增减的同步现象。这主要是由于幅射对精原细胞的武接致死效应,还是抑制有丝分裂所造成的,由于我们没有深入分析各种类型的精原细胞,也没有研究畸变等出现在有丝分裂那一时期,所似对之还不能作出肯定的结论。同时我们发现精细管的各个部份和精细管腔内各个区域的辐射敏感性和恢复能力存在着导质现象。 4.200侖X-射线直接照射弥猴睾丸后,第40天时细胞总数及精子均降到最低水平,以后,不再减少逐渐呈现恢复趋势。由此我们推论弥猴精子发生的一个周期大约在50天左右。

    The radio-sensitivity of DNA in mice thymus deoxyribonucleoprotein (DNP) was compared with that of free DNA on irradiation with γ-rays of 5,000 r in 1 M NaCl solution. After irradiation, the DNP was immediately precipitated with alcohol and deproteinized with sodium dodecyl sulphate and the liberated DNA isolated. It was found that both the "melting-temperature" (T-m) and the intrinsic viscosity of the DNA thus isolated dropped markedly, while the free DNA, similarly irradiated, showed only insignificant changes.It...

    The radio-sensitivity of DNA in mice thymus deoxyribonucleoprotein (DNP) was compared with that of free DNA on irradiation with γ-rays of 5,000 r in 1 M NaCl solution. After irradiation, the DNP was immediately precipitated with alcohol and deproteinized with sodium dodecyl sulphate and the liberated DNA isolated. It was found that both the "melting-temperature" (T-m) and the intrinsic viscosity of the DNA thus isolated dropped markedly, while the free DNA, similarly irradiated, showed only insignificant changes.It was suspected that the process of deproteinization with sodium dodecyl sulphate in the isolation of DNA from DNP post-irradiation might be responsible for the changes obtained in the physicochemical properties of DNA. Some control experiments were, therefore, carried out by subjecting the irradiated free DNA to the same process of deproteinization. The results showed that a fall of T_m and intrinsic viscosity was also observed, but the degree of changes was not so marked as that in DNA isolated from the irradiated DNP. On the basis of the experimental results, it can be assumed that sodium dodecyl sulphate might intensify the hidden damage to either irradiated DNA or DNP, but DNA in the DNP molecule is more susceptible to ionizing radiation than is free DNA. Our results are apparently at variance with those of previous workers. It is suggested that the proteins in DNP are not likely to exert any protective effect on DNA, but rather render it more vulnerable to the destructive action of irradiation. The possible role played by the proteins in the initiation of irradiation damage of DNA was discussed.

    用特性粘度与Tm测定的方法,发现在1M NaCl溶液中DNP經5,000伦琴γ射綫照射后,其中DNA的輻射損伤大于单独照射的DNA。提出了一个新的观点,即DNP中蛋白貭可能有加強DNA輻射損伤的效应。并討論了損伤的机制,指出了这种現象在輻射損伤原发机制中的重要性。

     
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