全文获取类型
收费全文 | 517篇 |
免费 | 34篇 |
国内免费 | 2篇 |
专业分类
林业 | 33篇 |
农学 | 10篇 |
107篇 | |
综合类 | 41篇 |
农作物 | 46篇 |
水产渔业 | 56篇 |
畜牧兽医 | 210篇 |
园艺 | 9篇 |
植物保护 | 41篇 |
出版年
2024年 | 1篇 |
2023年 | 5篇 |
2022年 | 16篇 |
2021年 | 25篇 |
2020年 | 21篇 |
2019年 | 35篇 |
2018年 | 23篇 |
2017年 | 16篇 |
2016年 | 18篇 |
2015年 | 23篇 |
2014年 | 22篇 |
2013年 | 12篇 |
2012年 | 39篇 |
2011年 | 53篇 |
2010年 | 23篇 |
2009年 | 18篇 |
2008年 | 31篇 |
2007年 | 31篇 |
2006年 | 27篇 |
2005年 | 20篇 |
2004年 | 24篇 |
2003年 | 18篇 |
2002年 | 10篇 |
2001年 | 2篇 |
2000年 | 4篇 |
1998年 | 5篇 |
1997年 | 1篇 |
1996年 | 5篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1991年 | 1篇 |
1989年 | 1篇 |
1987年 | 6篇 |
1986年 | 1篇 |
1983年 | 1篇 |
1981年 | 2篇 |
1980年 | 3篇 |
1979年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1970年 | 1篇 |
排序方式: 共有553条查询结果,搜索用时 15 毫秒
81.
Adriana Quintanar Guzmán María Eugenia Jaramillo Flores Javier Solorza Feria María Guadalupe Méndez Montealvo Ya-Jane Wang 《Journal of Cereal Science》2010
Although nixtamalization is widely used in the food industry, a comprehensive understanding of the influence of proteins on the viscoelastic behavior and thermal properties in masa is still lacking. In this work, the effect of protein changes and its influence on the masa viscoelastic behavior were studied using model systems. Mixtures of lime-starch, zein-starch and lime-zein-starch were cooked at 90 °C from 20 to 150 min. Zein changes during cooking were analyzed by SDS-PAGE. Thermal transition temperatures and enthalpies were determined using differential scanning calorimetry (DSC). Dynamic oscillatory tests were undertaken on model system samples with 50% (w/v) moisture content, using a strain-controlled rheometer. SDS-PAGE showed that zein polymerizes during cooking. In the zein-starch model system, no visible protein bands were found after 30 min cooking; however, when lime was present, five bands were observed in all samples. Thermal transitions were observed around 55–62 °C for all model systems, probably corresponding to starch retrogradation. Rheological studies showed that protein exhibited higher influence in the gel strength by increasing the elastic character of the system. It was hypothesized that the combined effects of lime on starch, zein polymerization and the formation of calcium-zein bonds during cooking, yield a stronger and more elastic gel structure. 相似文献
82.
83.
An 8-year-old Siberian husky dog was presented for a mass involving the rostral mandible. Intraoral radiographs demonstrated diffusely irregular bone and displacement of all mandibular incisor teeth. The mass was diagnosed as a grade I multilobular tumor of bone based on incisional biopsy. A bilateral rostral mandibulectomy was performed with tumor negative margins. Oral examination at 14-months following surgery indicated normal healing with minimal side effects and no evidence of tumor recurrence. 相似文献
84.
Araújo FD Esper LM Kuaye AY Sircili MP Marsaioli AJ 《Journal of agricultural and food chemistry》2012,60(2):585-592
A chemical study of acyl-homoserine lactones (acyl-HSLs) produced by Enterobacter sakazakii resulted in the identification of three molecules: (S)-N-heptanoyl-HSL, (S)-N-dodecanoyl-HSL and (S)-N-tetradecanoyl-HSL. Mixed cultures of E. sakazakii and Bacillus cereus depleted E. sakazakii acyl-HSLs, suggesting acyl-HSL degradation by B. cereus hydrolases (hydrolysis of the lactone or amide moiety). The expression of B. cereus acyl-HSL lactonase and acyl-homoserine acylase was confirmed by monitoring the biotransformation of (S)-N-dodecanoyl-HSL into (S)-N-dodecanoyl-homoserine, dodecanoic acid and homoserine in the presence of B. cereus whole cells, using electrospray-mass spectrometry (ESI-MS). 相似文献
85.
Colín-González AL Ortiz-Plata A Villeda-Hernández J Barrera D Molina-Jijón E Pedraza-Chaverrí J Maldonado PD 《Plant foods for human nutrition (Dordrecht, Netherlands)》2011,66(4):348-354
Different garlic products reduce the cerebral ischemic damage due to their antioxidant properties. In this work, we investigated
the effect of aged garlic extract (AGE) on cyclooxygenase-2 (COX-2) protein levels and activity, and its role as a possible
mechanism of neuroprotection in a cerebral ischemia model. Animals were subjected to 1 h of ischemia plus 24 h of reperfusion.
AGE (1.2 ml/kg weight, i.p.) was administered at onset of reperfusion. To evaluate the damage induced by cerebral ischemia, the neurological deficit,
the infarct area, and the histological alterations were measured. As an oxidative stress marker to deoxyribonucleic acid,
8-hydroxy-2-deoxyguanosine (8-OHdG) levels were determined. Finally, as inflammatory markers, TNFα levels and COX-2 protein
levels and activity were measured. AGE treatment diminished the neurological alterations (61.6%), the infarct area (54.8%)
and the histological damage (37.7%) induced by cerebral ischemia. AGE administration attenuated the increase in 8-OHdG levels
(77.8%), in TNFα levels (76.6%), and in COX-2 protein levels (73.6%) and activity (30.7%) induced after 1 h of ischemia plus
24 h of reperfusion. These data suggest that the neuroprotective effect of AGE is associated not only to its antioxidant properties,
but also with its capacity to diminish the increase in TNFα levels and COX-2 protein expression and activity. AGE may have
the potential to attenuate the cerebral ischemia-induced inflammation. 相似文献
86.
87.
88.
Baron Toaldo M Guglielmini C Diana A Giunti M Dondi F Cipone M 《The Journal of small animal practice》2011,52(5):271-277
A 13-year-old, neutered female domestic shorthair cat was presented for sudden respiratory distress following palliative radiotherapy and the combined administration of a single dose of carboplatin for the treatment of recurrent fibrosarcoma. Clinical and radiographic findings were suggestive of pleural effusion. Echocardiography revealed marked right-sided cardiac enlargement associated with tricuspid regurgitation and Doppler evidence of pulmonary hypertension. After 25 days of treatment for congestive heart failure and suspected pulmonary thromboembolism, clinical signs and echocardiographic and Doppler evidence of right-sided cardiac enlargement and pulmonary hypertension had completely resolved. To the best of the authors' knowledge, this is the first report of reversible pulmonary hypertension, likely secondary to pulmonary thromboembolism, in a cat. 相似文献
89.
van Houten D 《Tijdschrift voor diergeneeskunde》2011,136(8):552-555
90.