全文获取类型
收费全文 | 192篇 |
免费 | 10篇 |
专业分类
林业 | 8篇 |
农学 | 8篇 |
基础科学 | 1篇 |
12篇 | |
综合类 | 31篇 |
农作物 | 4篇 |
水产渔业 | 7篇 |
畜牧兽医 | 108篇 |
园艺 | 1篇 |
植物保护 | 22篇 |
出版年
2023年 | 4篇 |
2021年 | 7篇 |
2020年 | 2篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2016年 | 11篇 |
2015年 | 6篇 |
2014年 | 3篇 |
2013年 | 10篇 |
2012年 | 9篇 |
2011年 | 12篇 |
2010年 | 5篇 |
2009年 | 2篇 |
2008年 | 7篇 |
2007年 | 9篇 |
2006年 | 7篇 |
2005年 | 9篇 |
2004年 | 6篇 |
2003年 | 5篇 |
2001年 | 3篇 |
2000年 | 5篇 |
1999年 | 6篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1996年 | 3篇 |
1995年 | 3篇 |
1994年 | 3篇 |
1993年 | 5篇 |
1991年 | 5篇 |
1990年 | 6篇 |
1989年 | 3篇 |
1986年 | 1篇 |
1985年 | 3篇 |
1983年 | 4篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1976年 | 2篇 |
1975年 | 1篇 |
1974年 | 5篇 |
1973年 | 2篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1970年 | 1篇 |
1968年 | 2篇 |
1966年 | 1篇 |
1965年 | 1篇 |
1954年 | 1篇 |
1925年 | 1篇 |
1886年 | 1篇 |
排序方式: 共有202条查询结果,搜索用时 15 毫秒
101.
Toft N Innocent GT McKendrick IJ Ternent HE Mellor DJ Gunn GJ Synge B Reid SW 《Preventive veterinary medicine》2005,71(1-2):45-56
Using a sample of 949 Scottish farms with finishing cattle, the spatial distribution of Escherichia coli O157-positive farms was investigated using disease mapping models. The overall prevalence of E. coli O157-positive farms was estimated as 22%. The regions used in this study were the 16 postcode areas of Scotland. For each region, the posterior relative risk (RR) was estimated as a model-based alternative to the saturated standardized morbidity ratio (SMR), i.e., the ratio between observed and expected cases in a region. Three Bayesian hierarchical models with generalized linear modeling of the area-specific risks were used to estimate the posterior relative risk of E. coli O157-positive farms in the postcode areas: a random-effects model incorporating only spatially uncorrelated heterogeneity; a model incorporating both spatially correlated and uncorrelated heterogeneity; and a pseudo-mixture model with unstructured correlation and a weighted mix of two variance components representing the spatial correlation and a jump structure. None of the models identified any areas with a significant increase or decrease in risk. The deviance information criteria slightly favored the simplest model (RR range: 0.92--1.09). However, this model appeared to smooth out more of the variation in the RR compared to the pseudo-mixture model, which gave a more informative pattern of the posterior relative risks (range: 0.81--1.22). 相似文献
102.
Effects of Interferon‐Tau and Steroids on Cytochrome P450 Activity in Bovine Endometrial Epithelial Cells
下载免费PDF全文
![点击此处可从《Reproduction in domestic animals》网站下载免费的PDF全文](/ch/ext_images/free.gif)
The objective of the current study was to examine cyclooxygenase (COX), cytochrome P450 1A (CYP1A) and 2C (CYP2C) activity in bovine endometrial cell cultures following exposure to oxytocin (OT), interferon‐τ (IFN), estradiol (E2) and/or progesterone (P4). Bovine endometrial epithelial cells were treated with OT, IFN, a combination of OT+IFN or control (CON) media for 24 h. For the second experiment, cells were treated with E2, P4, a combination of E2 + P4 or CON media for 24 h. Treatments were performed in triplicate, and the experiment was repeated four times (n = 12 per treatment). Treatment with OT alone increased (p < 0.01) activity of COX compared with CON; however, OT alone did not alter activity of CYP1A (p = 0.55) or CYP2C (p = 0.46) compared with CON. Activity of CYP1A and CYP2C was decreased in cells exposed to IFN (p < 0.01) or OT+IFN (p < 0.01) compared with CON. Treatment with E2 alone did not alter activity of CYP1A (p = 0.64) or CYP2C (p = 0.06) compared with CON. Activity of CYP1A and CYP2C was decreased (p < 0.01) in P4 vs CON. In summary, IFN exposure, irrespective of OT treatment, decreased the activity of CYP1A and CYP2C. Activity of CYP1A was decreased following P4 treatment alone, while that of CYP2C was decreased following both P4 and E2 + P4 treatment. The mixed function monooxygenase enzymes, CYP1A and CYP2C, have been implicated in synthesizing embryotoxic compounds; therefore, downregulation in the endometrium may be necessary during maternal recognition of pregnancy. 相似文献
103.
Treena I. Burgess Adrián López-Villamor Trudy Paap Briony Williams Rajah Belhaj Michael Crone William Dunstan Kay Howard Giles E. St. J. Hardy 《Plant pathology》2021,70(3):604-614
The genus Phytophthora contains species that are major pathogens worldwide, affecting a multitude of plant species across agriculture, horticulture, forestry, and natural ecosystems. Here, we concentrate on those species that are dispersed through soil and water, attacking the roots of the plants, causing them to rot and die. The intention of this study was to compare the soil baiting protocol developed by the Centre for Phytophthora Science and Management (CPSM) with two other baiting methods used in Australia. The aim was to demonstrate the effectiveness of each protocol for soil baiting Phytophthora species in different substrates. Three experiments were conducted: the first to test the sensitivity of each method to detect Phytophthora cinnamomi, the second to test the effect of substrate type (sand or loam), and the third to test the detection of species (P. cinnamomi, P. multivora, or P. pseudocryptogea). The specificity of different plant species baits was compared within and between the methods. Substrate type influenced isolation in all methods; however, the CPSM method was superior regardless of substrate, albeit slower than one of the other methods for one substrate. Comparing bait species between the three methods, Quercus ilex was the most attractive bait for P. cinnamomi, particularly in the CPSM method. The choice of protocol affected the isolation associated with each bait type. Overall, the multiple bait system used by CPSM was shown to provide the most sensitive and reliable detection of Phytophthora species from soil samples. 相似文献
104.
R. P. Smith R. M. Chalmers K. Elwin F. A. Clifton‐Hadley D. Mueller‐Doblies J. Watkins G. A. Paiba M. Giles 《Zoonoses and public health》2009,56(1):24-33
Companion animals owned by human patients with cryptosporidiosis (cases) and those animals owned by the wider human population (controls), were studied to determine whether Cryptosporidium was more likely to be excreted by case animals than controls. A total of 280 recently voided faecal samples (114 case animals and 166 control animals) were collected and tested by immunomagnetic separation and immunofluorescent microscopy. A multivariable model was also created to identify pet characteristics, contacts and management factors associated with Cryptosporidium infection in animals, using information collected by a standardized questionnaire. The model was designed to take into account the clustering of samples at the owner level and whether the sampled animal was a case or control. 相似文献
105.
106.
107.
The 10 Australian ecosystems most vulnerable to tipping points 总被引:2,自引:0,他引:2
William F. Laurance Bernard Dell Stephen M. Turton Michael J. Lawes Lindsay B. Hutley Hamish McCallum Patricia Dale Michael Bird Giles Hardy Gavin Prideaux Ben Gawne Clive R. McMahon Richard Yu Jean-Marc Hero Lin Schwarzkopf Andrew Krockenberger Michael Douglas Ewen Silvester Michael Mahony Karen Vella Udoy Saikia Carl-Henrik Wahren Zhihong Xu Bradley Smith Chris Cocklin 《Biological conservation》2011,(5):1472-1480
We identify the 10 major terrestrial and marine ecosystems in Australia most vulnerable to tipping points, in which modest environmental changes can cause disproportionately large changes in ecosystem properties. To accomplish this we independently surveyed the coauthors of this paper to produce a list of candidate ecosystems, and then refined this list during a 2-day workshop. The list includes (1) elevationally restricted mountain ecosystems, (2) tropical savannas, (3) coastal floodplains and wetlands, (4) coral reefs, (5) drier rainforests, (6) wetlands and floodplains in the Murray-Darling Basin, (7) the Mediterranean ecosystems of southwestern Australia, (8) offshore islands, (9) temperate eucalypt forests, and (10) salt marshes and mangroves. Some of these ecosystems are vulnerable to widespread phase-changes that could fundamentally alter ecosystem properties such as habitat structure, species composition, fire regimes, or carbon storage. Others appear susceptible to major changes across only part of their geographic range, whereas yet others are susceptible to a large-scale decline of key biotic components, such as small mammals or stream-dwelling amphibians. For each ecosystem we consider the intrinsic features and external drivers that render it susceptible to tipping points, and identify subtypes of the ecosystem that we deem to be especially vulnerable. 相似文献
108.
The quality of an agrochemical application is a combination of the efficacy of deposit, productivity of the operation, and avoidance of off-site movement. A GPS- and sensor-based system was developed to document the quality of spray applications from a self-propelled sprayer. Confirmation of the spray deposition was accomplished with spray sampling surfaces (water sensitive paper) located at surveyed sampling points in the test fields. An image analysis technique was developed to estimate quantitative and qualitative data, such as relative droplet size spectra, and spray coverage from the cards. Relative performance of two flow control techniques, namely conventional pressure-based control and blended-pulse flow control were documented. Blended-pulse control produced a wider dynamic range and superior consistency of deposit when speed varied over a 3:1 range, or a 6:1 variable rate range was desired. Real-time mitigation of spray drift was accomplished through droplet size changes when sensed weather conditions and sprayer location suggested a potential hazard. 相似文献
109.
Gerken T Girard CA Tung YC Webby CJ Saudek V Hewitson KS Yeo GS McDonough MA Cunliffe S McNeill LA Galvanovskis J Rorsman P Robins P Prieur X Coll AP Ma M Jovanovic Z Farooqi IS Sedgwick B Barroso I Lindahl T Ponting CP Ashcroft FM O'Rahilly S Schofield CJ 《Science (New York, N.Y.)》2007,318(5855):1469-1472
Variants in the FTO (fat mass and obesity associated) gene are associated with increased body mass index in humans. Here, we show by bioinformatics analysis that FTO shares sequence motifs with Fe(II)- and 2-oxoglutarate-dependent oxygenases. We find that recombinant murine Fto catalyzes the Fe(II)- and 2OG-dependent demethylation of 3-methylthymine in single-stranded DNA, with concomitant production of succinate, formaldehyde, and carbon dioxide. Consistent with a potential role in nucleic acid demethylation, Fto localizes to the nucleus in transfected cells. Studies of wild-type mice indicate that Fto messenger RNA (mRNA) is most abundant in the brain, particularly in hypothalamic nuclei governing energy balance, and that Fto mRNA levels in the arcuate nucleus are regulated by feeding and fasting. Studies can now be directed toward determining the physiologically relevant FTO substrate and how nucleic acid methylation status is linked to increased fat mass. 相似文献
110.