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排序方式: 共有162条查询结果,搜索用时 31 毫秒
101.
Narayanan N Thirugnanasambantham P Viswanathan S Kannappa Reddy M Vijayasekaran V Sukumar E 《Fitoterapia》2000,71(2):147-153
The alcoholic extract of the roots of Premna herbacea was investigated for its antipyretic, antinociceptive and anti-inflammatory potential in animal models. The extract, when administered orally to mice has been found to be safe up to a dose of 8.0 g/kg. A significant antipyretic effect has been observed in rabbits while mild antinociceptive effects were evidenced in mice when tested by chemical as well as thermal methods. The extract did not exhibit any anti-inflammatory activity in acute but significantly reduced the chronic inflammation. 相似文献
102.
Pulp and paper mill waste water irrigation increased pH, EC, organic carbon and exchangeable sodium content of soils. The increase in organic matter content of soils accelerated microbial activity and hence accelerated substrate decomposition with the release of CO2 . There exhibited a peak followed by a steady-decline in the rate of CO2 evolution in effluent irrigated soils. The irrigation of pulp and paper mill combined effluent to soils did not affect microbial activity. 相似文献
103.
Interactions between a plant growth‐promoting rhizobacterium and smoke‐derived compounds and their effect on okra growth
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Heino B. Papenfus Manoj G. Kulkarni Wendy A. Stirk Kannan R. R. Rengasamy M. Victoria Salomon Patricia Piccoli Rubén Bottini Johannes van Staden 《植物养料与土壤学杂志》2015,178(5):741-747
Plant growth‐promoting rhizobacteria (PGPR) are used in agriculture to improve crop yield. Crude smoke–water (made by bubbling plant‐derived smoke through water) stimulates germination and improves seedling growth. Some active compounds have been isolated from smoke with karrikinolide (KAR1) stimulating plant growth and trimethylbutenolide (TMB) being inhibitory. These smoke compounds have great potential in agriculture but their interaction with PGPR is unknown. In the present study, a two‐factorial pot trial with three replicates per treatment was designed to investigate the interactions between Bacillus licheniformis and two concentrations each of smoke–water, KAR1, and TMB on okra (Abelmoschus esculentus). Growth and physiological parameters (chlorophyll, carotenoid, protein, sugar and α‐amylase) of okra as well as bacterial abundance in the rhizosphere were measured after 5 weeks. Application of B. licheniformis and 10?7 M KAR1 significantly improved the shoot biomass and 10?7 M KAR1 also significantly improved leaf area of okra. However, when 10?7 M KAR1 was applied in combination with B. licheniformis, there was an antagonistic effect on plant growth. While TMB had a negative effect on plant growth, a combination treatment of TMB and B. licheniformis overcame the inhibitory effect of TMB resulting in plant growth similar to the control plants. All treatments had no effect on chlorophyll, carotenoid, protein and sugar concentrations, while α‐amylase activity was significantly elevated in okra root treated with 1:500 (v/v) smoke–water. Determining the rhizobacteria populations at harvest showed that all treatments had no significant effect on the rhizosphere microbial abundance. The modes of interaction between PGPR and smoke‐derived compounds need to be further elucidated. 相似文献
104.
Leukotoxins of gram-negative bacteria. 总被引:12,自引:0,他引:12
Sanjeev Kumar Narayanan T G Nagaraja M M Chengappa George C Stewart 《Veterinary microbiology》2002,84(4):337-356
Leukotoxins are a group of exotoxins that produce their primary toxic effects against leukocytes, especially polymorphonuclear cells (PMNs). Leukotoxins include a variety of chemicals ranging from 9,10-epoxy 12-octadecenoate, a fatty acid derivative secreted by leukocytes themselves, to proteins such as RTX (repeats in toxin). This review focuses on leukotoxins of three species of gram-negative bacteria, Mannheimia (Pasteurella) haemolytica, Actinobacillus actinomycetemcomitans, and Fusobacterium necrophorum. 相似文献
105.
Maize (Zea mays L.) seeds of hybrid Ganga‐2 and its parent cultivars were germinated and allowed to absorb Zn labelled ZnCl2 , ZnEDTA or ZnEDDHA for 24 hours. The translocation of Zn in seedlings raised from them was followed on 5, 7 and 10 days. It was found that while the endosperm Zn content decreased rapidly, there was no significant increase in Zn transported to scutellum, root and shoot. There was no difference between Zn treatments as well as between the cultivars. The results demonstrated the poor mobility of Zn in maize during early growth. Further studies showed that the pretreatment of seeds with ZnEDTA and low amount of Fe enhanced chlorophyll content in 10 day old seedlings. No hybrid vigor was observed either in Zn translocation, or effects of Zn and Fe on chlorophyll synthesis. 相似文献
106.
Seshadri Kannan 《Journal of plant nutrition》2013,36(12):1025-1031
Fe‐deficiency chlorosis was induced in 4 lentil (Lens esculenta Moench) and 7 sesame (Sesamum indicum L.) cultivars by growing them in full nutrient solution for 20 days and then in the nutrient medium without Fe. In lentil cv. VL‐1, a mild chlorosis appeared but turned green after 14 days of stress. However, this recovery was not paralleled by a decrease in pH of the medium. In sesame, there were differences in the degree of tolerance. The cv. T‐13 did not develop any chlorosis, and the pH was found to steadily decrease to 4.5. The cv. SP‐1181 lowered the pH to only 5.6, and did not recover from the chlorosis. A second pattern was noted in VS‐2, TS‐25, TMV‐3 and TMV‐4; these cultivars reduced the pH to between 4.1 and 4.5; these showed a mild chlorosis which disappeared later.
The results show that the pH reduction is not a requisite for chlorosis recovery, at least in some crop cultivars. There are obviously some other mechanism which makes Fe available to the chlorotic leaves. It is suggested that a retranslocatlon of Fe from the older leaves may take place under the stress condition through some physiological process. 相似文献
107.
Alonso GP Guedes Elaine P Rude Mathur S Kannan 《Veterinary anaesthesia and analgesia》2013,40(5):512-516
ObjectiveTo investigate the CD38/cADPR signaling pathway as possible underlying mechanism of the effects of medetomidine on insulin and glucose homeostasis.AnimalsThirty–two C57BL/6 mice of both sexes.MethodsWild–type (WT) and CD38–knockout (CD38?/?) mice received medetomidine (50 μg kg?1) or a similar volume of 0.9% NaCl (control) by intraperitoneal (IP) injection (each group n = 8). The mice were euthanized 45 minutes later with sodium pentobarbital IP and blood was sampled via cardiac puncture. Insulin and glucose concentrations were measured by radioimmunoassay and by the oxygen rate method, respectively. Data were analyzed with anova and Bonferroni post hoc (5% significance) and are shown as mean ± SD.ResultsPlasma insulin and glucose concentrations were similar between WT and CD38?/? mice under control conditions. As compared to controls, medetomidine administration produced a statistically significant decrease in plasma insulin concentrations in the WT mice whereas the decrease in the CD38?/? mice was not statistically significant. Correspondingly, medetomidine caused a significantly greater increase in plasma glucose concentrations in the WT than in the CD38?/? mice.ConclusionThe CD38/cADPR signaling pathway may be one underlying mechanism of the glucose and insulin effects of the alpha–2 adrenergic receptor agonist medetomidine and likely other drugs of its’ class. 相似文献
108.
Yokoyama T Etoh T Kitagawa H Tsukahara S Kannan Y 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2003,65(4):449-452
It has been hitherto considered that mature erythroblasts migrate toward the sinusoid along the cytoplasmic processes of macrophages of erythroblastic islands in bone marrow. Our previous report, however, has demonstrated the morphological features of a mature erythroblastic island passing through the sinusoidal endothelium. In this study, the possibility of migration of erythroblastic islands toward the sinusoid was examined in rat bone marrow by light microscopical histoplanimetry. As a result, the more mature erythroblasts were not regularly arranged in the peripheral direction of the erythroblastic islands. Immature erythroblasts were populated more in the erythroblastic islands away from the sinusoid than in those islands neighboring the sinusoid, whereas mature erythroblasts were more in erythroblastic islands neighboring the sinusoid. These findings suggest that the formation of erythroblastic islands occurs in a region away from the sinusoid, and that erythroblastic islands migrate towards the sinusoids as erythroid maturation proceeds. 相似文献
109.
Thomas A Linden A Mainil J Dizier I Baseman JB Kannan TR Fleury B Frey J Vilei EM 《Veterinary microbiology》2004,104(3-4):213-217
An analogue of the adhesin gene p40 of Mycoplasma agalactiae was found in Mycoplasma bovis. Nucleotide sequence analysis of the p40* gene in M. bovis revealed the presence of a large deletion involving a frameshift that causes premature truncation of the translated protein, indicating that p40* exists as a pseudogene in M. bovis. 相似文献
110.
The water and ethanol extracts of stems of Tinospora cordifolia and T. sinensis inhibit immunosuppression produced by cyclophosphamide. Ethanol extracts of stems of both the plants inhibit cyclophosphamide-induced anemia. The water extract of T. sinensis is found to be more potent than the other extracts. 相似文献