全文获取类型
收费全文 | 135篇 |
免费 | 5篇 |
国内免费 | 10篇 |
专业分类
林业 | 1篇 |
农学 | 4篇 |
7篇 | |
综合类 | 22篇 |
农作物 | 10篇 |
水产渔业 | 7篇 |
畜牧兽医 | 85篇 |
园艺 | 12篇 |
植物保护 | 2篇 |
出版年
2024年 | 4篇 |
2023年 | 4篇 |
2022年 | 13篇 |
2021年 | 9篇 |
2020年 | 9篇 |
2019年 | 12篇 |
2018年 | 4篇 |
2017年 | 1篇 |
2015年 | 5篇 |
2014年 | 4篇 |
2013年 | 8篇 |
2012年 | 5篇 |
2011年 | 7篇 |
2010年 | 3篇 |
2009年 | 11篇 |
2008年 | 2篇 |
2007年 | 12篇 |
2006年 | 6篇 |
2005年 | 3篇 |
2004年 | 4篇 |
2003年 | 3篇 |
2002年 | 1篇 |
2001年 | 1篇 |
2000年 | 2篇 |
1999年 | 5篇 |
1998年 | 5篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1995年 | 3篇 |
1986年 | 1篇 |
排序方式: 共有150条查询结果,搜索用时 31 毫秒
1.
2.
3.
为研究褪黑素浸种对盐碱胁迫下大豆种子萌发的影响,以大豆品种垦丰16为试验材料,研究100μmol/L褪黑素浸种对不同浓度混合盐碱(NaCl和NaHCO3物质的量按1:1混合,配制为0、25、50、100、200mmol/L的盐碱溶液)胁迫下大豆种子萌发的影响。结果表明:与对照相比,随盐碱浓度提升,大豆种子发芽率、发芽指数、芽鲜重和芽干重呈不断降低趋势,超氧化物歧化酶、过氧化物酶、过氧化氢酶、谷胱甘肽还原酶和谷胱甘肽过氧化物酶活性呈现先升高后降低的趋势,抗坏血酸过氧化物酶活性呈不断上升趋势;渗透调节物质可溶性糖、可溶性蛋白和脯氨酸含量呈现先升高后降低的趋势;膜脂过氧化产物丙二醛、H2O2含量、$\mathop{{O}}_{2}^{{\mathop{}_{\ .}^{-}}}$产生速率呈不断上升趋势。褪黑素浸种可提高不同浓度盐碱胁迫下大豆种子发芽率、发芽指数、芽鲜重、芽干重和抗氧化酶活性以及渗透调节物质含量,降低丙二醛、H2O2含量和$\mathop{{O}}_{2}^{{\mathop{}_{\ .}^{-}}}$产生速率。综上所述,褪黑素浸种可以缓解不同浓度盐碱胁迫对大豆种子发芽的抑制作用,并能提高抗氧化酶活性和渗透调节物质含量,降低膜脂过氧化程度。 相似文献
4.
5.
裘皮制品在水洗后常出现皮板硬、强度差、收缩温度低的现象 ,即所谓反硝。我们针对反硝裘皮制品的特点 ,制订了常温浸水回软 ,浸酸 ,醛 -铬结合鞣工序多阶段分段加脂 ,实践证明 :该工艺简单易行 ,通过该工艺处理后的反硝裘皮制品柔软、丰满、耐水洗、耐湿热 ,得到客户的一致好评 相似文献
6.
选取150只健康乌苏里幼貉(Nyctereutes ussurienusis Matschie),随机分成1个对照组和4个试验组.各试验组按25%、50%、75%、100%比例用膨化大豆替代鱼粉饲料进行饲养试验,通过对针、绒毛的长度、粗细和皮板长度等反映毛皮质量各项指标的测定与分析得出:彭化大豆代替鱼粉能满足乌苏里貉冬毛生长的需要,不影响乌苏里貉毛皮质量. 相似文献
7.
Hamster sperm hyperactivation is enhanced by progesterone, and this progesterone-enhanced hyperactivation is suppressed by 17β-estradiol (17βE2) and γ-aminobutyric acid (GABA). Although it has been indicated that melatonin also enhances hyperactivation, it is unknown whether melatonin-enhanced hyperactivation is also suppressed by 17βE2 and GABA. In the present study, melatonin-enhanced hyperactivation was significantly suppressed by 17βE2 but not by GABA. Moreover, suppression of melatonin-enhanced hyperactivation by 17βE2 occurred through non-genomic regulation via the estrogen receptor (ER). These results suggest that enhancement of hyperactivation is regulated by melatonin and 17βE2 through non-genomic regulation. 相似文献
8.
Background
Exogenous melatonin could induce cashmere growth. However, induced growth of cashmere fleece by melatonin implants cannot be combined with the typical growth, resulting in earlier shedding followed by another cycle of cashmere growth. To address this issue, we examine the effects on the cashmere yield, fibre characteristics, and the growth and reproductive performance of cashmere goats of planned administration of melatonin.Methods
Eighteen half-sib, female goats were assigned to two treatments (n = 9) including a control and a treatment where melatonin (2 mg/kg BW) was implanted at the end of April and end of June. Cashmere growth and shedding were observed for approximately 1 year following implantation. Fibre samples were collected monthly to determine cumulative cashmere length. Initiation and cessation dates for cashmere growth as well as the rate of cashmere growth were calculated. Cashmere yield, weight gain of dam, kidding date, litter size, and birth weight were also recorded.Results
Melatonin implantation increased cashmere yield by 34.5 % (control 553.7 g vs. melatonin 745.0 g; P < 0.01), cashmere length by 21.3 % (control 95.2 mm vs. melatonin 115.4 mm; P < 0.01), and decreased fibre diameter by 4.4 % (control 14.6 μm vs. melatonin 14.0 μm; P < 0.03). In melatonin-treated goats, the average initiation date was earlier than in control goats (May 18, 2013 vs. July 2, 2013; P < 0.01) but there was a similar cessation date (March 22, 2014 vs. March 27, 2014). Consequently, the duration of cashmere growth was longer in melatonin-treated goats than in control goats (307 vs.270 days; P < 0.01). The final BW, average daily gain, kidding date, litter size, and birth weight were not influenced by melatonin implantation.Conclusions
These data indicate that melatonin implantation (2 mg/kg BW) on two occasions (late April and June) increased cashmere yield by combining the induced growth of cashmere fleece with the typical growth and decreased the fibre diameter without changing dam growth rate or reproductive performance. 相似文献9.
AIM: To investigate the influence of melatonin at different concentrations on the gut motility. METHODS: Male C57BL mice were used in the study. The mice were intraperitoneally injected with melatonin at doses of 1 mg/kg, 5 mg/kg, 50 mg/kg and 75 mg/kg. The colon bead expulsive time was measured at 15 min and 45 min after injection. The melatonin antagonist luzindole at a dose of 5 mg/kg was used before injection of 75mg/kg melatonin. The gut transit time was also recorded with oral Evens blue after injection of melatonin. RESULTS: Compared with control group, melatonin at the dose of 1 mg/kg at 15 min decreased the colon bead expulsive time. However, melatonin at high dose (75 mg/kg) prolonged the colon bead expulsive time compared with the control, which was effectively blocked by melatonin antagonist luzindole. Compared with control group, injection of melatonin at the dose of 5 mg/kg at 45 min decreased the colon bead expulsive time. However, melatonin at high dose (75 mg/kg) prolonged the colon bead expulsive time. No difference of colon bead expulsive time between using 1 mg/kg and 50 mg/kg melatonin was observed. In whole gut transit time test, after injection of melatonin at the doses of 1 mg/kg and 5 mg/kg, the time was decreased. The expulsive time of fecal pellet with Evens blue was shorten as compared with control group. However, the gut transit time was significantly prolonged after high dose of melatonin (75 mg/kg) was used. CONCLUSION: Low dose of melatonin increases while high dose decreases the gut motility. Melatonin antagonist luzindole effectively blocks the latter effect. 相似文献
10.