全文获取类型
收费全文 | 43篇 |
免费 | 0篇 |
国内免费 | 1篇 |
出版年
2022年 | 1篇 |
2019年 | 1篇 |
2017年 | 1篇 |
2013年 | 4篇 |
2012年 | 1篇 |
2011年 | 1篇 |
2010年 | 1篇 |
2009年 | 2篇 |
2008年 | 1篇 |
2007年 | 1篇 |
2004年 | 1篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1991年 | 1篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1984年 | 1篇 |
1980年 | 1篇 |
1977年 | 1篇 |
1975年 | 1篇 |
1972年 | 2篇 |
1971年 | 3篇 |
1969年 | 2篇 |
1968年 | 1篇 |
1967年 | 4篇 |
1963年 | 1篇 |
1959年 | 1篇 |
1957年 | 1篇 |
1956年 | 1篇 |
1955年 | 1篇 |
1950年 | 1篇 |
排序方式: 共有44条查询结果,搜索用时 0 毫秒
41.
JIUSONG ZHANG MASAYOSH ICHIBA CHIKAKO KIYOHARA YOICHI NAKANISHI KOICHI TAKAYAMA NOBUYUKU HARA 《Biomarkers》2013,18(2):152-157
We have investigated the correlation between DNA adduct levels and aryl hydrocarbon hydroxylase (AHH) activity in peripheral lymphocyte samples obtained from 42 lung cancer patients. DNA adducts and AHH activity were determined by the 32P-postlabelling technique and the fluorometric method, respectively. The mean +/- SD of DNA adduct level was 0.88 +/- 0.37 (ranged from 0.22 to 1.90) per 108 nucleotides. The geometric means of non-induced and 3-methylcholanthrene (MC)-induced AHH activity, as well as AHH inducibility (MC-induced AHH activity/non-induced AHH activity) were 0.029, 0.228 pmol min-1 10-6 cells, and 7.776, respectively. There was no statistically significant correlation between DNA adduct levels and non-induced or MC-induced AHH activity. A tendency of positive correlation was found between DNA adduct levels and AHH inducibility for the all subjects (n = 42, r = 0.25, p = 0.11). Such a positive correlation reached statistical significance in the subjects with squamous cell carcinoma (n = 13, r = 0.70, p < 0.01). In addition, similar correlation of DNA adducts with AHH inducibility was also observed in the GSTM1 present genotype (n = 17, r = 0.44, p = 0.07) and GSTP1-AA genotype (n = 29, r = 0.37, p = 0.05) individuals. These findings suggest that DNA adduct levels are mediated by CYP1A1 enzyme, and AHH inducibility may be a more relevant indicator than specific AHH activity for explaining the variation of DNA adduct levels in lymphocytes. 相似文献
42.
Experiments on the movement and behaviour of a freshwater musselLimnoperna fortunei (Dunker) were conducted m the laboratory.Small mussels of 512 mm shell lengths moved over 100cm during a day within plastic containers, with a maximum distanceof 300 cm. However, their movement was concentrated during thefirst five hours of the experiments. The distance moved decreasedwith increasing shell length, and mussels larger than 27 mmmoved less than 20 cm. Both small (< 15 mm) and large (>15mm) mussels showed negative photo-taxis and positive geotaxisunder the light, but positive geotaxis of small mussels tendedto be weak in darkness or under the shade Small mussels hadstrong thigmotaxis with a preference for settling in the angledcrevices between the vertical walls and the flat bottoms ofthe containers Small mussels tended to aggregate, after movement,and the presence of large mussels facilitated secretion of byssalthreads by the small mussels. The possible adaptive significanceof these behaviours and movement are discussed in relation toresponse to predation and dislodgement by waves or water current (Received 11 September 1995; accepted 18 December 1995) 相似文献
43.
MASAMI YAMAO HIDEKI SHIMIZU OSAMU NAKAMURA KENJI SOH NOBUYUKI HAMADA KATSUMI KOGA KATSUYA HAYASHI 《Development, growth & differentiation》1977,19(1):41-45
Amino acid incorporation was studied with cell-free extracts and ribosomes prepared from pupal ovaries at different ages of Bombyx mori. Poly(U)-directed 3H-phenylalanine incorporation attained a maximum rate at a certain stage of development, but soon dropped to a low level and was replaced by 3H-leucine incorporation, which was due to endogenous mRNA. The latter incorporation occurred at the stage when actual protein synthesis takes place in the ovaries. “Run-off” of the ribosomes which had a high endogenous activity resulted in an enhancement of the poly(U)-dependent activity. The results indicate that the protein synthesis in the ovary is mainly controlled at the level of mRNA. This was further supported by the fact that the relative amount of an ovarian poly(A)-containing “mRNA” fraction increased in parallel with the endogenous activity. 相似文献
44.
4-Ethoxy-1-(p-tolyl)-s-triazine-2,6(1H,3H)-dione (TA) dramaticallyand synergistically promoted gibberellic acid-induced elongationof rice second leaf sheaths. The elongation from 84 to 132 hafter sowing occurred only at the region 02 mm from thebase in control samples, at the 04 mm region in TA- orGA-treated samples, and at the 012 mm region in TA plusGA-treated samples. The increase in elongation rate inducedby TA and/or GA was greatest in the 02 mm region anddecreased gradually toward the ligule. The longitudinal growthinduced by TA and/or GA was due to the increase in cell numbersby cell division, as well as to increase in length of cells.Electron microscopic examinations revealed that TA and/or GAsuppressed the development of plastids which caused the leafcolour to be pale. Irrespective of TA and/or GA treatment(s),microtubules were observed to be exclusively oriented perpendicularto the longitudinal axis of the cell in actively elongatingzones, and in fully elongated zones they were randomly oriented. 相似文献