全文获取类型
收费全文 | 5559篇 |
免费 | 226篇 |
国内免费 | 14篇 |
专业分类
林业 | 401篇 |
农学 | 233篇 |
基础科学 | 39篇 |
661篇 | |
综合类 | 579篇 |
农作物 | 214篇 |
水产渔业 | 218篇 |
畜牧兽医 | 3032篇 |
园艺 | 45篇 |
植物保护 | 377篇 |
出版年
2019年 | 45篇 |
2018年 | 68篇 |
2017年 | 102篇 |
2016年 | 87篇 |
2015年 | 58篇 |
2014年 | 81篇 |
2013年 | 205篇 |
2012年 | 157篇 |
2011年 | 178篇 |
2010年 | 112篇 |
2009年 | 123篇 |
2008年 | 221篇 |
2007年 | 214篇 |
2006年 | 183篇 |
2005年 | 205篇 |
2004年 | 180篇 |
2003年 | 185篇 |
2002年 | 174篇 |
2001年 | 205篇 |
2000年 | 199篇 |
1999年 | 185篇 |
1998年 | 54篇 |
1997年 | 73篇 |
1996年 | 66篇 |
1995年 | 57篇 |
1994年 | 47篇 |
1993年 | 63篇 |
1992年 | 127篇 |
1991年 | 136篇 |
1990年 | 135篇 |
1989年 | 138篇 |
1988年 | 108篇 |
1987年 | 122篇 |
1986年 | 103篇 |
1985年 | 97篇 |
1984年 | 93篇 |
1983年 | 67篇 |
1982年 | 39篇 |
1979年 | 82篇 |
1978年 | 63篇 |
1977年 | 73篇 |
1976年 | 46篇 |
1975年 | 69篇 |
1974年 | 85篇 |
1973年 | 74篇 |
1972年 | 75篇 |
1971年 | 56篇 |
1970年 | 70篇 |
1969年 | 51篇 |
1968年 | 44篇 |
排序方式: 共有5799条查询结果,搜索用时 15 毫秒
121.
122.
123.
124.
125.
126.
Persson Waller K Grönlund U Johannisson A 《Journal of veterinary medicine. B, Infectious diseases and veterinary public health》2003,50(3):121-127
Udder health problems associated with Staphylococcus aureus infections in dairy cows are difficult to control and antibiotics have limited effects. Lately, more interest has been directed towards ways to stimulate the innate immune mechanisms of the animal for better prevention and treatment of mastitis. The objectives of this study were to investigate if intramammary infusion at drying off with the immune modulator beta1,3-glucan can make the udder more resistant to experimental intra mammary S. aureus infection at this time, and to study if intramammary infusion of beta1,3-glucan into lactating udder quarters with chronic subclinical S. aureus infection can stimulate the clearing of the infection. Another aim was to evaluate the effect of beta1,3-glucan on the expression of major histocompatibility complex (MHC class II) on mammary leucocytes, measured by flow cytometry, during these circumstances. The results indicated a slight, but not statistically significant, positive effect of beta1,3-glucan at drying off on the clinical and anti-bacterial response to S. aureus infection, but no therapeutic effect of beta1,3-glucan treatment of udder quarters with chronic subclinical S. aureus mastitis. However, the proportion of MHCII+ milk lymphocytes tended to increase after glucan infusion in those udder quarters indicating a stimulation of the antigen presenting ability. To further evaluate a possible preventive effect of beta1,3-glucan infusion at drying off more studies are needed involving a larger number of animals. 相似文献
127.
Braun U 《Veterinary journal (London, England : 1997)》2003,166(2):112-124
Ultrasonography is an ideal diagnostic tool for investigating gastrointestinal disorders in cattle. It is performed on standing non-sedated cattle using a 3.5 MHz linear transducer. In animals with traumatic reticuloperitonitis, inflammatory fibrinous changes, and abscesses can be imaged; however, magnets and foreign bodies are difficult to visualize because of the gas content of the reticulum. Ultrasonography can be used to assess the size, position and contents of the abomasum. Percutaneous ultrasound-guided abomasocentesis can be performed to evaluate the nature and chemical composition of its contents. In left displacement of the abomasum, the abomasum is seen between the left abdominal wall and the rumen. It contains fluid ingesta ventrally and a gas cap of varying size dorsally. Occasionally, the abomasal folds are seen in the ingesta. In cattle with right displacement of the abomasum, the liver is displaced medially from the right abdominal wall by the abomasum, which has an ultrasonographic appearance similar to that described for left displacement. Motility and diameter of the intestine are the most important criteria for ultrasonographic assessment of ileus. However, the cause of the ileus is rarely determined using ultrasonography. In cases with ileus of the small intestine, there is at least one region of dilatation of the intestine and motility is reduced or absent. In cattle with caecal dilatation, the caecum can always be imaged from the right lateral abdominal wall. The wall of the caecum closest to the transducer appears as a thick, echogenic, semi-circular line. 相似文献
128.
Bertazzolo W Toscani L Calcaterra S Crippa L Caniatti M Bonfanti U 《Journal of Feline Medicine and Surgery》2003,5(1):11-17
This retrospective study describes the clinicopathological findings in five cats with soft tissue mineralisation of interdigital spaces and footpads. Paw disease was the reason for veterinary consultation in three out of five cats. All cats had laboratory findings suggestive of renal failure and high solubility product [calciumxphosphorus]. In all cases, cytological examination of paw lesions was suggestive of calcinosis. The results of our study agree with two previous case reports of paw calcification in the cat, suggesting a metastatic pathogenesis and a correlation between paw mineralisation and renal failure. 相似文献
129.
ABSTRACT A simple model has been developed to predict the onset of pseudothecia maturity and seasonal ascospore showers in relation to blackleg disease in canola, caused by the fungus Leptosphaeria maculans. The model considers a combination of two weather factors, daily mean temperature and daily total rainfall, to drive progress of maturity of pseudothecia on the infested canola stubble left from past crops. Each day is categorized as suitable or not suitable for progress of the maturation process. The onset of pseudothecia maturity occurs when approximately 43 suitable days have occurred. Following the onset of maturity, ascospore showers are triggered when daily rainfall exceeds a threshold. The model satisfactorily predicted the timing of the onset of pseudothecia maturity when tested with 3 years of field observations at four locations in Western Australia, which characteristically has a Mediterranean climate. The model also agreed reasonably well with the daily pattern of ascospore release observed in two locations. Sensitivity analysis was performed to show the relative importance of the parameters that describe the onset of pseudothecia maturity. 相似文献
130.
Pathogen occurrence was studied in 16099 adult specimens of 10 different bark beetle species, which live associated on Norway spruce (Picea abies (L.) Karst.). Beetles (mainly Ips typographus L. and Pityogenes chalcographus L.) were collected from 6 different localities in Austria (4 secondary spruce stands and 2 natural forest type stands, 9 sampling plots in total) in elevations between 400m and 1600m. Various viral, protozoan, and fungal pathogens could be diagnosed with a light microscope in the examined beetles. Numerous pathogen species were known from former studies, some pathogens were totally new or could be found in a new host species beside their type host. The most dominant pathogen species were Protozoa, Gregarina cf. typographi, Malamoeba cf. scolyti, and Chytridiopsis cf. typographi. Over the whole investigation period, the highest pathogen diversity with eight pathogen species was found in I. typographus. Differences were observed in the pathogen complex of each beetle species from the different collection sites and in different years of investigation. Several species showed an overlapping in their host range and infected various bark beetle species. Furthermore, pathogen occurrence and prevalence differed in bark beetles from 4 different sampling plots in an area (one locality) within a distance of a few kilometres. 相似文献