全文获取类型
收费全文 | 235篇 |
免费 | 6篇 |
专业分类
林业 | 32篇 |
农学 | 7篇 |
56篇 | |
综合类 | 7篇 |
农作物 | 13篇 |
水产渔业 | 19篇 |
畜牧兽医 | 88篇 |
园艺 | 4篇 |
植物保护 | 15篇 |
出版年
2023年 | 1篇 |
2022年 | 5篇 |
2021年 | 3篇 |
2020年 | 1篇 |
2019年 | 3篇 |
2018年 | 4篇 |
2017年 | 2篇 |
2016年 | 8篇 |
2015年 | 7篇 |
2014年 | 8篇 |
2013年 | 19篇 |
2012年 | 15篇 |
2011年 | 21篇 |
2010年 | 9篇 |
2009年 | 11篇 |
2008年 | 20篇 |
2007年 | 20篇 |
2006年 | 17篇 |
2005年 | 12篇 |
2004年 | 13篇 |
2003年 | 13篇 |
2002年 | 12篇 |
2001年 | 9篇 |
2000年 | 3篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有241条查询结果,搜索用时 31 毫秒
91.
Ryunosuke Tateno Keitaro Fukushima Reiji Fujimaki Tetsuya Shimamura Masami Ohgi Hirotsugu Arai Nobuhito Ohte Naoko Tokuchi Takahito Yoshioka 《Journal of Forest Research》2009,14(5):276-285
We investigated soil net nitrogen mineralization rate, above- and belowground biomass allocation, and nitrogen use in a Cryptomeria japonica plantation chronosequence. Total biomass accumulation showed an asymptotic accretion pattern, and the peak total biomass
accumulation rate occurred approximately 30 years after afforestation. Soil net nitrogen mineralization rate was lowest 30 years
after afforestation. Between years 30 and 88, net nitrogen mineralization increased again. These results indicate that an
imbalance in soil nitrogen supply and plant nitrogen demand occurred approximately 30 years after afforestation. Furthermore,
leaf nitrogen concentration, which was used as an index of plant nitrogen status, was lower in mature forest than in young
forest, suggesting that mature stands did not take up nitrogen as successfully. If soil resources such as nitrogen limit plant
growth, plants may increase biomass allocation to fine root structure; however, fine root biomass was not higher in 30- and
88-year-old stands than in younger stands, suggesting that changes in biomass allocation may not be effective against nitrogen
deficiency in a C. japonica plantation chronosequence. 相似文献
92.
Paddy and Water Environment - In the A irrigation district in Yamagata Prefecture, Japan, a rehabilitation project is being implemented due to the aging of the irrigation facilities;... 相似文献
93.
Katsuhiko Warita Nana Oshima Naoko Takeda-Okuda Jun-ichi Tamura Yoshinao Z. Hosaka 《Marine drugs》2016,14(10)
Chondroitin sulfate (CS), a type of glycosaminoglycan (GAG), is a factor involved in the suppression of myogenic differentiation. CS comprises two repeating sugars and has different subtypes depending on the position and number of bonded sulfate groups. However, the effect of each subtype on myogenic differentiation remains unclear. In this study, we spiked cultures of C2C12 myoblasts, cells which are capable of undergoing skeletal muscle differentiation, with one of five types of CS (CS-A, -B, -C, -D, or -E) and induced differentiation over a fixed time. After immunostaining of the formed myotubes with an anti-MHC antibody, we counted the number of nuclei in the myotubes and then calculated the fusion index (FI) as a measure of myotube differentiation. The FI values of all the CS-treated groups were lower than the FI value of the control group, especially the group treated with CS-E, which displayed notable suppression of myotube formation. To confirm that the sugar chain in CS-E is important in the suppression of differentiation, chondroitinase ABC (ChABC), which catabolizes CS, was added to the media. The addition of ChABC led to the degradation of CS-E, and neutralized the suppression of myotube formation by CS-E. Collectively, it can be concluded that the degree of suppression of differentiation depends on the subtype of CS and that CS-E strongly suppresses myogenic differentiation. We conclude that the CS sugar chain has inhibitory action against myoblast cell fusion. 相似文献
94.
95.
Ali Yawar Seerat Taiichiro Ookawa Katsuhiro Kojima Naoko Ohkama-Ohtsu Masumi Maeda Salem Djedidi 《Soil Science and Plant Nutrition》2019,65(2):122-136
This study evaluated the effects of the spores and their heat-treated residues from different strains of Bacillus species (B. pumilus, B. altitudinis, and B. megaterium) on the early growth of paddy rice cultivars, including Hitomebore (short-grain japonica rice), Takanari (high-yielding indica rice), and two new lines, TULK-143-6 and LTAT-29. The spores of seven Bacillus strains positively affected Hitomebore root growth, while, the root volume of TULK-143-6 with inoculation of B. pumilus TUAT1 and JM52, and root length and root surface area of LTAT-29 with inoculation of B. megaterium MAFF301694 were increased significantly. In contrast with Hitomebore, Takanari root growth was significantly inhibited by the spores of six Bacillus strains. Surprisingly, inoculations with the spore residues from all tested Bacillus strains increased the root dry weight of Hitomebore, with the effects of four bacterial strains being significant. Furthermore, there were more Bacillus spores than vegetative cells at different time points during the initial rice growth stage, and most plant samples mainly consisted of Bacillus spores. Thus, the spores of Bacillus species likely promote rice root development. 相似文献
96.
97.
Su Myo Thwe Takeshi Kobayashi Tianyao Luan Takaaki Shirai Munenaka Onodera Naoko Hamada-Sato Chiaki Imada 《Fisheries Science》2011,77(2):279-288
γ-Aminobutyric acid (GABA)-producing lactic acid bacteria (LAB) were isolated from four types of Myanmar traditional fermented
fishery products with boiled rice. All of them belonged to the genus Lactobacillus, and comparison of the effects of these representatives on GABA accumulation in fermented fishery products with boiled rice
revealed that Lactobacillus farciminis D323 is the most effective strain as a starter culture. These results may contribute to the development of traditional fermented
fishery products with functional properties. In addition, this study is the first to show in detail the distribution of GABA-producing
LAB in Southeast Asian fermented fishery products. 相似文献
98.
99.
Naoko?Kitamoto Kazuhiro?Nishikawa Yoshinori?Tanimura Shoji?Urushibara Takuya?Matsuura Shuji?Yokoi Yoshihito?Takahata Susumu?YuiEmail authorView authors OrcID profile 《Euphytica》2017,213(12):292
We developed new F1 hybrids of Chinese cabbage (Brassica rapa L. ssp. pekinensis) that allow cultivation earlier in spring without heating by introducing extremely late-bolting alleles at two homologs of the flowering repressor Flowering Locus C (BrFLC2 and BrFLC3) from non-heading ‘Leafy Green Parental Line No. 2’. These new F1 hybrids were produced by the following four steps. First, the extremely late bolting selected lines were developed. These selected lines headed in spring after overwintering cultivation, whereas the conventional F1 cultivars flowered. Secondly, an investigation of the three plantings showed that our F1 hybrids formed heads when seeds were sown from mid-February to early March, whereas the conventional F1 cultivar did not form heads because of premature bolting. Thirdly, we identified some F1 hybrids with extremely late bolting during early spring cultivation in an investigation of many F1 hybrids. Finally, based on an investigation across four cold regions for 2 years, we compared the commercialization rate, defined as the proportion of plants greater than 2000 g in weight and with a flowering stalk less than 10 cm long. Then we identified a F1 of MS02 × 12-04 which had a high commercialization rate on average (92%), whereas the rates of three conventional F1 cultivars were only 0–2%. In the near future, these F1 hybrids will be valuable late-bolting cultivars despite climate change, permitting stable cultivation and harvest over wide regions. 相似文献
100.