全文获取类型
收费全文 | 127篇 |
免费 | 13篇 |
专业分类
林业 | 1篇 |
农学 | 2篇 |
8篇 | |
综合类 | 36篇 |
农作物 | 3篇 |
水产渔业 | 5篇 |
畜牧兽医 | 65篇 |
园艺 | 1篇 |
植物保护 | 19篇 |
出版年
2018年 | 3篇 |
2017年 | 4篇 |
2016年 | 2篇 |
2015年 | 4篇 |
2014年 | 2篇 |
2013年 | 6篇 |
2011年 | 2篇 |
2009年 | 2篇 |
2008年 | 4篇 |
2007年 | 5篇 |
2006年 | 3篇 |
2005年 | 5篇 |
2004年 | 2篇 |
2003年 | 3篇 |
2002年 | 3篇 |
2001年 | 5篇 |
2000年 | 2篇 |
1999年 | 3篇 |
1997年 | 5篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1991年 | 3篇 |
1988年 | 5篇 |
1987年 | 1篇 |
1984年 | 2篇 |
1983年 | 3篇 |
1982年 | 3篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1978年 | 9篇 |
1977年 | 1篇 |
1976年 | 2篇 |
1975年 | 1篇 |
1974年 | 3篇 |
1973年 | 4篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1970年 | 3篇 |
1969年 | 1篇 |
1968年 | 5篇 |
1967年 | 1篇 |
1966年 | 1篇 |
1963年 | 1篇 |
1962年 | 2篇 |
1960年 | 1篇 |
1956年 | 1篇 |
1948年 | 1篇 |
1947年 | 1篇 |
1937年 | 1篇 |
1935年 | 1篇 |
排序方式: 共有140条查询结果,搜索用时 15 毫秒
51.
Enhancing the effectiveness of biological control programs of invasive species through a more comprehensive pest management approach 下载免费PDF全文
Joseph M DiTomaso Robert A Van Steenwyk Robert M Nowierski Jennifer L Vollmer Eric Lane Earl Chilton Patrick L Burch Phil E Cowan Kenneth Zimmerman Christopher P Dionigi 《Pest management science》2017,73(1):9-13
Invasive species are one of the greatest economic and ecological threats to agriculture and natural areas in the US and the world. Among the available management tools, biological control provides one of the most economical and long‐term effective strategies for managing widespread and damaging invasive species populations of nearly all taxa. However, integrating biological control programs in a more complete integrated pest management approach that utilizes increased information and communication, post‐release monitoring, adaptive management practices, long‐term stewardship strategies, and new and innovative ecological and genetic technologies can greatly improve the effectiveness of biological control. In addition, expanding partnerships among relevant national, regional, and local agencies, as well as academic scientists and land managers, offers far greater opportunities for long‐term success in the suppression of established invasive species. In this paper we direct our recommendations to federal agencies that oversee, fund, conduct research, and develop classical biological control programs for invasive species. By incorporating these recommendations into adaptive management strategies, private and public land managers will have far greater opportunities for long‐term success in suppression of established invasive species. © 2016 Society of Chemical Industry 相似文献
52.
53.
54.
H. K. Were J. N. Kabira Z. M. Kinyua F. M. Olubayo J. K. Karinga J. Aura A. K. Lees G. H. Cowan L. Torrance 《Potato Research》2013,56(4):325-342
Potato plays an important role in food security in Kenya but yields are low (<10 t/ha), and this is partly attributed to the lack of healthy planting material. This study is the first wide-scale survey to determine the occurrence and distribution of common potato pests and diseases in Kenyan seed (certified and quality declared) and ware crops. Potato crops growing on 101 farms in 21 districts were examined. Approximately 36% of plants in farmers’ fields sampled both during the long rains (main potato-growing season) and short rains seasons displayed virus-like disease symptoms. Six viruses (potato leafroll virus (PLRV), Potato virus A (PVA), potato virus M (PVM), potato virus S (PVS), potato virus X (PVX), and potato virus Y (PVY)) were detected using double antibody sandwich enzyme-linked immunosorbent assay in potato samples. Sequencing of polymerase chain reaction products from PVY-infected plants revealed the presence of recombinant strains of PVY (NTN and Wilga). Four aphid species, Macrosiphum euphorbiae, Aphis gossypii, Myzus persicae, and Aphis fabae, colonized potato in all districts, occurring in greater numbers west of the Great Rift Valley than to the east. There was a positive correlation between virus incidence and aphid numbers in the long rains (main) potato-growing season. PLRV, PVM, PVS, PVX, and PVY were detected in solanaceous weeds. Ralstonia solanacearum was detected in soils from 13 farms in 8 of the 18 districts surveyed. Approximately 38% of soil samples were infested with Meloidogyne spp. Phytophthora infestans isolates belonging to the US 1 and 2_A1 genotypes were identified. Although many economically important diseases are present in Kenya, the lower aphid incidence in districts east of the Great Rift Valley may indicate that these districts are more suitable for seed potato production. 相似文献
55.
Evaluation of immunomodulatory effect of recombinant human granulocyte‐macrophage colony‐stimulating factor on polymorphonuclear cell from dogs with cancer in vitro 下载免费PDF全文
Y. Zhang S. Axiak‐Bechtel C. Friedman Cowan J. Amorim K. Tsuruta A. E. DeClue 《Veterinary and comparative oncology》2017,15(3):968-979
The objective of this in vitro study was to evaluate the immunomodulatory effects of recombinant human granulocyte‐macrophage colony‐stimulating factor (rhGM‐CSF) on polymorphonuclear cell (PMN) function in dogs with cancer. PMNs were harvested from dogs with naturally developing cancer as a pre‐clinical model to evaluate the immunomodulatory effects of rhGM‐CSF on PMN phagocytic and cytotoxic functions, cytokine production and receptor expression. Some aspects of cancer‐related PMN dysfunction in dogs with cancer were restored following incubation with rhGM‐CSF including PMN phagocytosis, respiratory burst and LPS‐induced TNF‐α production. In addition, rhGM‐CSF increased surface HLA‐DR expression on the PMNs of dogs with cancer. These data suggests that dysfunction of innate immune response in dogs with cancer may be improved by rhGM‐CSF. The results of this study provided a pathophysiologic rationale for the initiation of clinical trials to continue evaluating rhGM‐CSF as an immunomodulatory therapy in dogs with cancer. 相似文献
56.
Effects of hemolysis and storage on quantification of hormones in blood samples from dogs, cattle, and horses 总被引:1,自引:0,他引:1
T J Reimers S V Lamb S A Bartlett R A Matamoros R G Cowan J S Engle 《American journal of veterinary research》1991,52(7):1075-1080
Veterinary diagnostic endocrinology laboratories frequently receive hemolyzed plasma, serum, or blood samples for hormone analyses. However, except for the previously reported harm done by hemolysis to canine insulin, effects of hemolysis on quantification of other clinically important hormones are unknown. Therefore, these studies were designed to evaluate effects of hemolysis on radioimmunoassay of thyroxine, 3,5,3'-triiodothyronine, progesterone, testosterone, estradiol, cortisol, and insulin in equine, bovine, and canine plasma. In the first experiment, hormones were measured in plasma obtained from hemolyzed blood that had been stored for 18 hours. Blood samples were drawn from pregnant cows, male and diestrous female dogs, and male and pregnant female horses. Each sample was divided into 2 equal portions. One portion was ejected 4 times with a syringe through a 20-gauge (dogs, horses) or 22-gauge (cows) hypodermic needle to induce variable degrees of hemolysis. Two subsamples of the blood were taken before the first and after the first, second, and fourth ejections. One subsample of each pair was stored at 2 to 4 C and the other was stored at 20 to 22 C for 18 to 22 hours before plasma was recovered and stored at -20 C. The second portion of blood from each animal was centrifuged after collection; plasma was recovered and treated similarly as was blood. Concentrations of thyroxine in equine plasma, of 3,5,3'-triiodothyronine, estradiol, and testosterone in equine and canine plasma, and of cortisol in equine plasma were not affected by hemolysis.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
57.
58.
It may be possible to determine the boron-8 solar neutrino flux, averaged over the past several million years, from the concentration of technetium-98 in molybdenite. The mass spectrometry of this system is greatly simplified by the absence of stable technetium isotopes, and the presence of the fission product technetium-99 provides a monitor of uiranium-induced backgrounds. This geochemical experiment could provide the first test of nonstandard solar models that suggest a relation between the chlorine-37 solar neutrino puzzle and the recent ice age. 相似文献
59.
Long-lived isotopes produced in the earth's crust by solar neutrinos may provide a method of probing secular variations in the rate of energy production in the sun's core. Only one isotope, calcium-41, appears to be suitable from the dual stand-points of reliable nuclear physics and manageable backgrounds. The proposed measurement also may be interesting in view of recent evidence for neutrino oscillations. 相似文献
60.
1. For laying fowls fed on a conventional diet increasing the environmental temperature from 21 to 27 °C at 333 d of age resulted in a depressed rate of egg output (333 to 500 d).
2. Egg output for birds kept at 27 °C from 333 d could not be increased to the maximum rate of output of birds at 21 °C for this period by feeding a diet of equal energy content containing increased proportions of protein‐rich ingredients.
3. The difference in both food intake and egg output between hens maintained at 21 and those maintained at 27 °C appeared to decrease when the higher temperature was introduced at 416 d of age. 相似文献