全文获取类型
收费全文 | 131篇 |
免费 | 11篇 |
专业分类
林业 | 5篇 |
农学 | 4篇 |
61篇 | |
综合类 | 2篇 |
农作物 | 15篇 |
水产渔业 | 13篇 |
畜牧兽医 | 34篇 |
园艺 | 1篇 |
植物保护 | 7篇 |
出版年
2023年 | 1篇 |
2021年 | 7篇 |
2020年 | 1篇 |
2019年 | 4篇 |
2018年 | 7篇 |
2017年 | 1篇 |
2016年 | 7篇 |
2015年 | 1篇 |
2014年 | 9篇 |
2013年 | 11篇 |
2012年 | 10篇 |
2011年 | 13篇 |
2010年 | 6篇 |
2009年 | 3篇 |
2008年 | 8篇 |
2007年 | 11篇 |
2006年 | 7篇 |
2005年 | 5篇 |
2004年 | 7篇 |
2003年 | 7篇 |
2002年 | 11篇 |
2001年 | 1篇 |
1995年 | 1篇 |
1993年 | 1篇 |
1972年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有142条查询结果,搜索用时 62 毫秒
21.
Ana Carina Heil da Silva Matos Juliana da Silva Leite Anglica Consalter Marcela Freire Vallim de Mello Maria de Lourdes Gonalves Ferreira Ana Beatriz Monteiro Fosenca Ana Maria Reis Ferreira 《Reproduction in domestic animals》2019,54(6):828-834
Granulosa cell tumour (GCT) is a majorly observed ovarian tumour in female dogs. It is essential to diagnose GCT in its initial phase before any symptoms occur, as histological and physiological differences may be observed based on the evolution of this neoplasia. This study aimed to analyse the anatomic histopathology of GCT in its initial stage, with findings of ovaries not yet with the suspicion of neoplasms in the Canis familiaris. A sample including 55 ovaries presented GCT in 40 female dogs. The histopathological analysis was performed considering the intensity of pleomorphism, vascularization and inflammatory infiltrate. Furthermore, we evaluated the mitoses count in 10 fields using 40× magnification. Out of the 40 animals evaluated, 62.5% (25/40) presented the tumour in only one ovary. The Call‐Exner corpuscle was present in 65% (26/40) of the cases. The follicular histological pattern was present in 52.5% (21/40) of the animals. The presence of the Call‐Exner bodies and the degree of tumour cell pleomorphism (p = 0.033) were associated. Moreover, the degree of vascularization and the intensity of the inflammatory infiltrate were also related (p = 0.001). In addition, there was a positive relationship between the increase in pleomorphism and the mean age of the animals (p = 0.044). This study confirmed that the appearance of this tumour may precede any clinical symptomatology. In this study, the most frequent histopathological pattern was the follicular. The characteristics of the granulosa cell tumour diagnosed early were poorly pleomorphic cells, low mitotic index and presence of Call‐Exner body. 相似文献
22.
Maria Lourdes A Cuvin-Aralar Alma G Lazartigue & Emiliano V Aralar 《Aquaculture Research》2009,40(2):181-187
Postlarvae of Litopenaeus vannamei were acclimated and stocked in lake-based cages at the following stocking densities: 10, 20, 30 and 40 shrimp m−2 . Another set of shrimp was stocked in concrete tanks as reference samples at 30 shrimp m−2 . Significant differences were observed among stocking densities throughout the 95-day culture. The final weight at harvest decreased with increasing stocking density: mean weights of 23.3, 15.8, 13.0, 10.9 and 14.6 g for the 10, 20, 30, 40 shrimp m−2 and reference tanks were observed respectively. There were no significant differences in survival throughout the culture period, ranging between 69% and 77%. Daily growth rates (range: 0.11–0.24 g day−1 ) and specific growth rates (range: 3.54–4.34%) also differed significantly among stocking densities, both increasing with decreasing stocking density. The feed conversion ratio in the cages did not differ among the stocking densities, ranging from 1.53 to 1.65. The relationship between stocking density and mean individual weight at harvest followed the equation y =81.06 x −0.54 ( R 2 =0.938) and that of stocking density and production (in g m−2 ) is y =58.01 x −0.46 ( R 2 =0.834). 相似文献
23.
Intraguild predation of Geocoris punctipes on Eretmocerus eremicus and its influence on the control of the whitefly Trialeurodes vaporariorum 下载免费PDF全文
24.
25.
Evaluation of frozen Umbrella‐stage Artemia as first animal live food for Litopenaeus vannamei (Boone) larvae 下载免费PDF全文
María de Lourdes Cobo Roeland Wouters Mathieu Wille Stanislaus Sonnenholzner Patrick Sorgeloos 《Aquaculture Research》2015,46(9):2166-2173
An alternative larval shrimp feeding regime, in which umbrella‐stage Artemia were constituting the first zooplankton source was evaluated in the culture of Litopenaeus vannamei. In a preliminary experiment, umbrella‐stage Artemia were fed to larvae from zoea 2 (Z2) to mysis 2 (M2) stages to identify the larval stage at which raptorial feeding starts and to determine daily feeding rates. The following experiment evaluated the performance of two feeding regimen that differed during the late zoea/early mysis stages: a control treatment with frozen Artemia nauplii (FAN), and a treatment with frozen umbrella‐stage Artemia (FUA). The ingestion rate of umbrella‐stage Artemia increased from nine umbrella per larvae day?1 at Z2 stage to 21 umbrella per larvae day?1 at M2. A steep increase in ingestion and dry weight from Z3 to M2 suggests a shift to a raptorial feeding mode at the M1 stage. Treatment FUA exhibited a significantly higher larval stage index (P < 0.05) during the period that zoea larvae metamorphosed to the mysis stage, and a higher final biomass, compared with treatment FAN. Based on these results and on practical considerations, a feeding regime starting with umbrella‐stage Artemia from Z2 sub‐stage can be recommended for L. vannamei larvae rearing. 相似文献
26.
Aoi Sugimoto Maria Lourdes San Diego-McGlone Francisco Paciencia Shielameh P. Milan Elizabeth T. Tomas Carolina C. Ramírez 《Journal Of Applied Aquaculture》2013,25(4):298-313
ABSTRACTThis study examined if, and how, comanagement is effective in controlling aquaculture industry in the municipalities of Anda and Bolinao in the province of Pangasinan, in the Philippines, the locations of two major production areas of milkfish (Chanos chanos) in the country. Institutional and community analyses conducted in these study sites revealed a unique hierarchy of resource users, as well as unique social and economic problems in aquaculture, distinct from those of capture fishery. It was also indicated that comanagement is seen as a solution for essential practices to be enforced practically and sustainably for the management of this industry. To improve aquaculture governance, it is desired that the comanagement scheme shall include not only the governments and fishers but also business operators who often have large capital and a high degree of power. 相似文献
27.
Javier Rey Lourdes Fernández-PeraltaAlba Esteban Ramón García-CancelaFrancisca Salmerón Miguel Ángel PuertoCarmen Piñeiro 《Fisheries Research》2012,113(1):159-172
Fish age determination using otoliths requires a prior understanding of growth mark deposition patterns (translucent rings, TR) as well as their connection with internal or external events experienced by the fish. This study analysed the macrostructural seasonal ring deposition pattern observed in transversal sections of black hake otoliths. A total of 793 black hake otoliths were collected in autumn and spring 2007 from research and commercial surveys carried out in continental and shelf waters off Mauritania. Most of the Merluccius polli otoliths presented narrow and wide translucent rings (NTR and WTR, respectively) regardless of fish size, whereas Merluccius senegalensis otoliths only showed NTR. This seemed to be a sign of ontogenetic discrepancy between the two black hake species, whose otoliths confirmed the existence of significant differences in their growth patterns.The frequency distributions of the number of TR counted along the ventral radius (VR) of the otolith from the nucleus (birth date) and from the ventral edge (death date) were analysed to ascertain whether a specific endogenous event (Hypothesis A) or a precise environmental event (Hypothesis B) could restrain growth leading to the formation of TR. The general TR frequency distribution pattern was somewhat similar for both hake species, which showed marked TR at comparable distances. Within each species, TR frequency distributions of their distances from the nucleus along the otolith VR were quite similar between sexes, seasons, and fish sizes. Our results support the idea of a coincident biological event, such as first maturity, slowing down the growth process and thus provoking the formation of TR in otoliths of both species.This study also experience difficulty using the complex and highly variable macrostructural pattern of black hake otoliths to establish age interpretation criteria for these two species. 相似文献
28.
Cortez Alcobedes Maria M. Boggio Gonzalo Guerra Ma. de Lourdes de Gavidia Magda Rodríguez Rojas Reyes Glenda C. Ferrer Elizabeth Lares Maria Alviarez Yenny Harrison Leslie J. S. Parkhouse R. Michael E. 《Tropical animal health and production》2010,42(3):531-537
There is a paucity of quantitative data on the status of porcine cysticercosis in Venezuela, information which is essential
for understanding the level of disease transmission. This study was, therefore, conducted in a typical small rural community
in Yaracuy State, Venezuela, where previous cases of human Taenia solium taeniasis/cysticercosis had been reported and where the free-ranging pig management practices and the lack of rudimentary
sanitary facilities indicated an obvious risk for transmission of the disease. Serum samples from 52 village pigs were screened
by enzyme-linked immunosorbent assays for anti-cysticercal antibodies (Ab-ELISA), using T. solium cyst fluid as the antigen and the HP10, monoclonal antibody-based, antigen trapping ELISA for parasite antigen (HP10 Ag-ELISA).
Significantly, a high proportion of the animals (65.4% for the Ab-ELISA and 42.3% for the HP10 Ag-ELISA) were sero-positive.
Five of the pigs, which were selected on that basis of positive tongue palpation, were killed for autopsy, and large numbers
of viable cysticerci were found in the carcases. This unequivocal documentation of porcine cysticercosis in Venezuelan pigs
presents clear evidence that T. solium is actively transmitted in Venezuela. Further detailed studies and implementation of appropriate control measures are therefore
indicated. 相似文献
29.
Sheila Mae S Santander – de Leon Wolfgang Reichardt Shielameh Peralta‐Milan Maria Lourdes San Diego‐McGlone Sharon Nonato Nuñal Hongyi Wei Takeshi Yoshikawa Suguru Okunishi Hiroto Maeda 《Aquaculture Research》2016,47(8):2569-2581
Bacterial communities in sediments underneath milkfish cages and adjacent off‐cage areas in Bolinao, Lingayen Gulf, West Philippine Sea were characterized using PCR‐denaturing gradient gel electrophoresis to assess influence of the fish farming to the sediments. The sediments in the fish cage (FC) area showed anoxic conditions [redox potential of ?165 to ?213 mV and acid‐volatile sulphide‐sulphur (AVS‐S) of 0.55–1.88 mg g?1 (dry weight)] compared to the relatively oxic off‐cage area [redox potential of 72–81 mV and AVS‐S of 0.09–0.14 mg g?1 (dry weight)]. The composition of the microbial populations revealed influence of the fish feed sedimentation with higher dominance of putative sulphate‐reducing bacteria (SRB) in the FC area. Compositions of the bacterial taxa showed dominance of the Bacteroidetes group and Deltaproteobacteria. The results suggest that the fish feeds created a new suitable environment, in which reductive microorganisms such as SRB, ferric‐ion‐reducing bacteria and nitrate‐reducing bacteria can thrive. Organic load from the feed and quantity of its leftover constituents may be the key factors that influence the structure of the bacterial community in the sediments of the milkfish farms. 相似文献
30.
Servin-Trujillo MA Reyes-Esparza JA Garrido-Fariña G Flores-Gazca E Osuna-Martinez U Rodriguez-Fragoso L 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2011,73(9):1151-1161
Tibia fractures are common in small animal practice. Over the past decade, improvements to animal internal fracture fixation have been developed. TGF-β1 has been shown to be crucial in the development, induction and repair of bone. In present study, we investigate the effect of local application of a graft demineralized bone matrix (DBM) along with TGF-β1 in a model of open osteotomy induced experimentally in dogs. Tibia fracture was brought about by using an open osteotomy model in young male dogs. Fracture repair was evaluated by a histological and biochemical analysis. Collagen content, proteolytic activity and urokinase-type plasminogen activator (uPA) expression were analyzed at the end of the study. Radiographic analysis, alkaline phosphatase and hematological evaluation were performed weekly. At the fifth week, there was an improvement and restoration of bone architecture in animals treated with a graft containing TGF-β1 (5 ng/ml) compared with the control and graft groups, as was evidenced by the presence of an early formation of wide callus and bone regeneration. In addition, local application of TGF-β1 led to an increase in collagen and proteolytic activity. More immunopositive osteoclast and mesenchymal cells were found in bone tissue from animals treated with TGF-β1 as compared with the control group. No changes in alkaline phosphatase, hematological and clinical parameters were observed. This study shows that the combined use of DBM along with TGF-β1 is able to improve and accelerate the bone repair. 相似文献