全文获取类型
收费全文 | 295篇 |
免费 | 30篇 |
专业分类
林业 | 7篇 |
农学 | 7篇 |
基础科学 | 1篇 |
25篇 | |
综合类 | 35篇 |
农作物 | 11篇 |
水产渔业 | 25篇 |
畜牧兽医 | 194篇 |
园艺 | 11篇 |
植物保护 | 9篇 |
出版年
2023年 | 13篇 |
2022年 | 4篇 |
2021年 | 26篇 |
2020年 | 33篇 |
2019年 | 22篇 |
2018年 | 12篇 |
2017年 | 9篇 |
2016年 | 15篇 |
2015年 | 6篇 |
2014年 | 14篇 |
2013年 | 9篇 |
2012年 | 16篇 |
2011年 | 30篇 |
2010年 | 13篇 |
2009年 | 8篇 |
2008年 | 15篇 |
2007年 | 19篇 |
2006年 | 13篇 |
2005年 | 7篇 |
2004年 | 11篇 |
2003年 | 2篇 |
2002年 | 1篇 |
2000年 | 2篇 |
1999年 | 1篇 |
1998年 | 2篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1986年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1975年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1969年 | 1篇 |
1945年 | 1篇 |
1883年 | 1篇 |
排序方式: 共有325条查询结果,搜索用时 15 毫秒
281.
282.
283.
Martínez-Jiménez D Hernández-Divers SJ Dietrich UM Williams CO Blasier MW Wilson H Frank PM 《Journal of the American Veterinary Medical Association》2007,230(6):868-872
CASE DESCRIPTION: A 1-year-old sexually intact female Netherland dwarf rabbit was examined because of a 3-week history of signs of lethargy, decreased appetite, left unilateral exophthalmia, a previous draining sinus from a left maxillary facial abscess, and bilateral nasal discharge. CLINICAL FINDINGS: The rabbit weighed 1.0 kg (2.2 lb) and had a body condition score of 1.5/5. Physical examination revealed generalized muscle atrophy, bilateral mucopurulent nasal discharge, and severe left-sided exophthalmia. Diagnostic investigation revealed anemia, neutrophilia, severe dental disease, a superficial corneal ulcer of the left eye, and a retrobulbar abscess. TREATMENT AND OUTCOME: Stomatoscopy-aided dental trimming, tooth removal, and abscess debridement were performed. Antimicrobials were flushed into the tooth abscess cavity, and antimicrobial treatment was initiated on the basis of cytologic findings and results of bacterial culture and susceptibility testing. Two months after the initial surgery, minimal exophthalmia was evident and no further physical, radiographic, or ultrasonographic changes were evident. CLINICAL RELEVANCE: Stomatoscopy is a valuable technique that can facilitate diagnosis, treatment, and serial reevaluation of rabbits with dental disease. 相似文献
284.
Alyokhin A Dively G Patterson M Castaldo C Rogers D Mahoney M Wollam J 《Pest management science》2007,63(1):32-41
One of the major challenges in managing the Colorado potato beetle, Leptinotarsa decemlineata (Say) is its remarkable ability to develop resistance to virtually every insecticide that has ever been used against it. Resistance is particularly common throughout northeastern USA as far north as Maine. The first instances of resistance to imidacloprid have already been reported from several locations in New York, Delaware and southern Maine. Rotating insecticides with different modes of action may delay insecticide resistance, but successful implementation of this technique depends on a good understanding of resistance and cross-resistance patterns in populations of target pests. LC(50) values were measured for imidacloprid and thiamethoxam in Colorado potato beetle populations from a variety of locations in the USA and Canada using diet incorporation bioassays. The field performance of imidacloprid, thiamethoxam and clothianidin against imidacloprid-resistant beetles on a commercial potato farm in southern Maine was also evaluated. Correlation between LC(50) values for imidacloprid and thiamethoxam was highly significant, even when populations previously exposed to thiamethoxam were excluded from the analysis. There was no statistically detectable difference in the LC(50) values between populations exposed to both insecticides and to imidacloprid alone. Applications of neonicotinoid insecticides at planting delayed build-up of imidacloprid-resistant beetle populations on field plots by 1-2 weeks but failed to provide adequate crop protection. Consistently with bioassay results, there was also substantial cross-resistance among the three tested neonicotinoid insecticides. Results of the present study support the recommendation to avoid rotating imidacloprid with thiamethoxam as a part of a resistance management plan. 相似文献
285.
286.
287.
Noel P. Clancey Megan C. Murphy 《The Canadian veterinary journal. La revue veterinaire canadienne》2012,53(4):383-386
A 16-month-old spayed female mixed breed dog was presented with a 1-week history of anorexia, lethargy, diarrhea, vomiting, and difficulty rising. Hematologic evaluation indicated a marked macrocytic hypo-chromic, markedly regenerative anemia. A metallic foreign object in the gastrointestinal tract was identified on abdominal radiographs. Serum zinc concentration was markedly increased. 相似文献
288.
A male domestic shorthair cat was presented with lethargy, anorexia, pyrexia and respiratory harshness. Diagnostic clinical chemistries, viral identification and tissue fluorescent antibody testing were negative or revealed no underlying system failure. Histopathology examination revealed multifocal, variable sized and shaped protozoal life forms in the brain, heart, lung, intestine, spleen, lymph node and kidney consistent with the intraleukocytic schizonts of Cytauxzoon felis. 相似文献
289.
David C Bolin James M Donahue Mary L Vickers Ralph C Giles Lenn Harrison Carney Jackson K B Poonacha John E Roberts Manu M Sebastian Steve E Sells Robert Tramontin Neil M Williams 《Journal of veterinary diagnostic investigation》2004,16(4):333-336
During the 2002 and 2003 foaling seasons, Cellulosimicrobium (Cellumonas) cellulans (formerly Oerskovia xanthineolytica) was the principal microorganism isolated from fetal tissues or placentas from cases of equine abortion, premature birth, and term pregnancies. Significant pathologic findings included chronic placentitis and pyogranulomatous pneumonia. In addition, microscopic and macroscopic alterations in the allantochorion from 4 of 7 cases of placentitis were similar to those caused by Crossiella equi and other nocardioform bacteria. This report confirms a causative role of C. cellulans infection in equine abortion. 相似文献
290.