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11.
Ramesh Chandra Malick Asit Kumar Bera Hemanta Chowdhury Manojit Bhattacharya Tanuja Abdulla Himanshu Sekhar Swain Raju Baitha Vikas Kumar Basanta Kumar Das 《Aquaculture Research》2020,51(6):2410-2420
The disease outbreaks in aquaculture system of wetlands are the major cause of fish mortality. Among various bacterial septicaemic diseases, fish mortality caused by Acinetobacter spp. is recently reported in different fish species. Fish disease outbreak was investigated in a wetland of West Bengal, India to identify the aetiological factors involved. The moribund fish were examined and subjected to bacterial isolation. Two bacterial causative agents were identified as Acinetobacter junii and Acinetobacter pittii by biochemical characterization and 16S rRNA gene amplification. Both the isolates were oxidase‐negative, nitrate‐negative, catalase‐positive and indole‐negative. The molecular identification using 16S rRNA gene sequencing and phylogenetic tree analysis further confirmed the two Acinetobacter spp. with 97%–99% similarity. The antibiotic resistance patterns of these two bacteria revealed that both of them were resistant to β‐lactam, cefalexin, cephalothin, amoxyclav, cefuroxime, cefadroxil, clindamycin, vancomycin and penicillin. In addition, A. pittii was also resistant to other antibiotics of cephams group such as ceftazidime and cefotaxime. In the challenge experiment, both A. junii and A. pittii were found to be pathogenic with LD50 of 1.24 × 105 and 1.88 × 107 cfu/fish respectively. Histopathological examination of gill, liver and kidney revealed prominent changes supporting bacterial septicaemia. The investigation reports for the first time on concurrent infection by A. junii and multidrug‐resistant (MDR)‐A. pittii as emerging fish pathogens to cause severe mortality in Labeo catla and Hypophthalmichthys molitrix in a freshwater wetland. 相似文献
12.
Wenhua Du Xiaochun Zhao Tokachichu Raju Phil Davies Richard Trethowan 《Euphytica》2012,186(3):697-704
Ascochyta blight (AB) disease, caused by the fungus Ascochyta rabiei, is a major yield limiting factor of chickpea in Australia and around the world. The aggressiveness of six A. rabiei isolates was identified using 3 chickpea varieties (Jimbour, Flipper and Yorker). These AB isolates were isolated from chickpea fields in northern NSW, one of the major chickpea production regions in Australia. Each of the six isolates produced a different aggressiveness pattern and isolate 4859 was found to be the most aggressive. The AB resistance in 16 international and Australian chickpea genotypes was then investigated by inoculating the plants with the most aggressive isolate and a mixture of the other 5 isolates. Resistance to both the most aggressive isolate and the mixed isolates has been identified in 5 genotypes (ICCV 98813, Flipper, ICCV 05111, ICCV 98801, Jimbour #1) while 10 entries (Howzat, ICCV 06108 and ICCV 98818, Jimbour, ICCV 96852, ICCV 06107, ICCV 98816, Yorker, FLIP97-114C, ICCV 96853) were moderately resistant. Only one genotype (Bumper) appeared to be susceptible to both inoculums. There was large variation observed in the pathogenicity of the isolates suggesting that the six AB isolates represent several different pathogen strains. Significant differences in leaf infection rate, plant infection rate, plant death rate and disease development were identified among the chickpea genotypes tested. These findings suggest that these chickpea genotypes carry different resistant genes, which can be exploited in breeding programmes to develop high levels of disease resistance. 相似文献
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Basavaraj P. S. Muralidhara Bharamappanavara Manoj C. A. Anantha M. S. Rathod Santosha Raju Ch. Damodar Senguttuvel P. Madhav M. S. Srinivasaprasad M. Prakasam V. Basavaraj K. Badri Jyothi Subbarao L. V. Sundaram R. M. Gireesh C. 《Genetic Resources and Crop Evolution》2021,68(5):1905-1921
Genetic Resources and Crop Evolution - The wild species of rice, Oryza rufipogon, is a source of genetic variation for yield-enhancing traits and blast resistance. With the objective to genetically... 相似文献
16.
Gustave Williamson Yuan Zhao-Feng Sekar Raju Ren Yu-Xiang Chang Hu-Cheng Liu Jinjing-Yuan Chen Zheng 《Journal of Soils and Sediments》2019,19(1):106-115
Journal of Soils and Sediments - Soil microbial fuel cells (sMFC) are novel technique that uses organic matters in soils as an alternative energy source. External resistance (ER) is a key factor... 相似文献
17.
Mineral nutrient uptake can be enhanced in plants inoculated with vesicular‐arbuscular mycorrhizal fungi (VAMF). The effects of the VAMF Glomus fasciculatum on uptake of P and other mineral nutrients in sorghum [Sorghum bicolor (L.) Moench] were determined in greenhouse experiments for plants grown on a low P (3.6 mg kg‐1) soil (Typic Argiudolls) with P added at 0, 12.5, 25.0, and 37.5 mg kg‐1 soil. Enhancements of growth and mineral nutrient uptake because of the VAMF association decreased as soil applications of P increased above 12.5 nig kg‐1 soil. Root colonization with VAMF without added soil P resulted in increased dry matter yield equivalent to 12.5 mg P kg‐1 soil (25 kg P ha‐1). Total root length colonized with VAMF decreased as soil P level increased. Regardless of P added to the soil, mycorrhizal plants had higher leaf P concentrations and contents than did nonmycorrhizal plants. Enhanced contents, but not necessarily concentrations, of the other mineral nutrients were noted in shoots of mycorrhizal compared to nonmycorrhizal plants. Mycorrhizal plants had enhanced shoot contents of P, K, Zn, and Cu which could not be accounted for by increased growth. The VAMF associations with sorghum roots enhanced mineral nutrient uptake when P was sufficiently low in the soil. 相似文献
18.
Raju Seenivasan Rengasamy Raghavendran Guruprasad Patnaik Asis 《Fibers and Polymers》2005,6(2):146-150
In this paper, friction of air-jet textured yarns is investigated. Using a friction measuring apparatus fabricated in-house,
dynamic friction forces of the yarns under yarn-to-metal (YM) and yarn-to-yarn (YY) rubbing modes are measured. The influence
of processing variables of air-jet texturing viz., overfeed, air pressure, dry/wet texturing and normal/core-and-effect texturing
on dynamic friction is analysed. The results indicate that friction force increases with increasing rubbing speeds and yarn
input tension. YM dynamic friction decreases initially and then starts to increase at higher overfeeds. YY dynamic friction
increases with increasing overfeed. YM dynamic friction decreases with an increase in air pressure while an opposite trend
is observed for YY friction. Wet textured yarns have higher friction than dry textured yarns. Core wetted core-and-effect
textured yarns have higher friction than normal textured yarns. 相似文献
19.
The petroleum ether and ethyl acetate extracts of Rhynchosia beddomei leaves showed inhibiting activity against some bacterial and fungal species at different concentrations. 相似文献
20.
Raju Naik Vankadavath Appibhai Jakir Hussain Reddaiah Bodanapu Eros Kharshiing Pinjari Osman Basha Soni Gupta Yellamaraju Sreelakshmi Rameshwar Sharma 《Plant methods》2009,5(1):18-10