全文获取类型
收费全文 | 182篇 |
免费 | 16篇 |
专业分类
林业 | 4篇 |
农学 | 3篇 |
35篇 | |
综合类 | 14篇 |
农作物 | 16篇 |
水产渔业 | 36篇 |
畜牧兽医 | 82篇 |
园艺 | 2篇 |
植物保护 | 6篇 |
出版年
2023年 | 1篇 |
2022年 | 3篇 |
2021年 | 14篇 |
2020年 | 11篇 |
2019年 | 6篇 |
2018年 | 6篇 |
2017年 | 7篇 |
2016年 | 7篇 |
2015年 | 9篇 |
2014年 | 6篇 |
2013年 | 17篇 |
2012年 | 12篇 |
2011年 | 12篇 |
2010年 | 6篇 |
2009年 | 5篇 |
2008年 | 6篇 |
2007年 | 14篇 |
2006年 | 5篇 |
2005年 | 5篇 |
2004年 | 8篇 |
2003年 | 5篇 |
2002年 | 2篇 |
2001年 | 3篇 |
2000年 | 3篇 |
1999年 | 4篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1986年 | 1篇 |
1974年 | 2篇 |
1973年 | 2篇 |
1970年 | 1篇 |
1952年 | 1篇 |
1947年 | 1篇 |
1934年 | 1篇 |
排序方式: 共有198条查询结果,搜索用时 31 毫秒
91.
Wing-Keong Ng Young-Chul Kim Nicholas Romano Chik-Boon Koh Si-Yong Yang 《Journal Of Applied Aquaculture》2013,25(1):22-31
An eight-week trial was performed to evaluate three commercial/prototype probiotics supplemented in red hybrid tilapia, Oreochromis sp. diets. Triplicate groups of tilapia were measured for growth performance, feeding efficiencies, and whole-body composition. After the feeding trial, duplicate groups of tilapia were assessed for their resistance to Streptococcus agalactiae over 23 days. Six diets were supplemented with 0.1% or 0.3% PB1 consisting of Bacillus subtilis, 0.1% or 0.3% PB2 consisting of B. licheniformis or 0.1% MPB consisting of Bacillus sp. and Pediococcus sp. Probiotics had no effect (p > 0.05) on growth or feeding efficiencies, although whole-body crude protein was significantly higher in the PB1 0.3% treatment. Tilapia in the probiotic treatments had a higher resistance to S. agalactiae and, with the exception of the PB2 0.1% diet, were all significantly higher than the control treatment. Although the tested probiotics were not growth promoters, dietary B. subtilis was the most effective prophylactic against pathogenic bacteria. 相似文献
92.
93.
Ricardo Vieira Rodrigues Janaína dos Santos Pedron Luis Alberto Romano Marcelo Borges Tesser Luís André Sampaio 《Aquaculture Research》2015,46(5):1241-1247
Fish are potentially submitted to water acidification when reared in recirculating aquaculture systems. This study evaluated the responses of juvenile cobia Rachycentron canadum after acute exposure to acid water. Juvenile cobia (12.6 ± 0.5 g; 14.2 ± 0.2 cm) were acutely exposed to four pH levels (7.9 (control), 6.5, 6.0, and 5.5). After 24 h of exposure to different pH values, fish were sampled for physiological and histopathological evaluation. Acid water affected physiological parameters and induced morphological histopathologies on gill and skin of juvenile cobia, and these effects were more conspicuous with decreasing pH values. Acid stress induced blood acidosis in juvenile cobia, coupled to a decrease in bicarbonate (HCO3?) and saturated O2 (sO2) in fish blood. On the other hand, haematocrit, haemoglobin and glucose concentration increased their values (P < 0.01) comparing to control level. Hyperplasia with completely fusion of secondary lamella was observed in all pH treatments (6.5. 6.0 and 5.5), while telangiectasia and proliferation of chloride cells were present for fish exposed to pH 6.0 and 5.5. In skin hyperplasia and hypertrophy of mucous cells, necrosis of these cells for fish exposed to pH 6.0 and 5.5 was observed. The results of this study demonstrate that acute acid water exposition affected physiology and histopathology in juvenile cobia, especially at pH values below 6.5. Accordingly, particular attention must be given to pH during cobia reared in recirculating aquaculture. 相似文献
94.
Rafael Soriani Medeiros Bianca Azevedo Lopez Luís André Sampaio Luis Alberto Romano Ricardo Vieira Rodrigues 《Aquaculture International》2016,24(4):985-993
False clownfish, Amphiprion ocellaris, is one of the most commercialized fish species in the world, highly produced to supply the aquarium market. The high stocking densities used to maximize fish production can increase ammonia and nitrite to toxic levels. In this study, A. ocellaris juveniles (1.20 ± 0.34 g) were exposed to six concentrations of ammonia ranged from 0.23 to 1.63 mg/L NH3-N and eight concentrations of nitrite (26.3–202.2 mg/L NO2 ?-N). The LC50- 24, LC50-48, LC50-72 and LC50-96 h were estimated to be 1.06, 0.83, 0.75 and 0.75 mg/L for NH3-N and 188.3, 151.01, 124.1 and 108.8 mg/L for NO2 ?-N. Analysis of gill lesions caused by sublethal concentrations of these nitrogenous compounds showed that both nitrogenous compounds induced tissue lesions such as hyperplasia of epithelium cells, hypertrophy of chloride cells and lamellar lifting to all concentrations tested. However, histopathological alterations were more conspicuous accordingly the increase of ammonia or nitrite in fish exposed to 0.57 mg/L NH3-N or 100 mg/L NO2 ?-N. Based on our results, we recommend to avoid concentrations higher than 0.57 mg/L of NH3-N and 25 mg/L of NO2-N in water. 相似文献
95.
96.
Briganti A Portela DA Barsotti G Romano M Breghi G 《Veterinary anaesthesia and analgesia》2012,39(5):488-494
Objective To evaluate the endotracheal tube cuff pressure achieved by four different inflation methods. Study design Prospective clinical study. Animals Eighty client owned dogs. Methods After anaesthesia induction, endotracheal intubation was performed using plastic or silicone tubes. A clinician unaware of tube type inflated the cuff by simple digital palpation (method A), thereafter the cuff was deflated and inflated again by a second clinician who tried to reproduce a previously learned cuff pressure of between 19 and 24 mmHg (method B). During method C the cuff was inflated to the minimum occlusive volume at an airway pressure of 20 cm H2O, and in method D the cuff was incrementally deflated until an audible air leak could be heard from the oral cavity at an airway pressure of 25 cm H2O. For all the methods, an operator recorded the actual cuff pressure obtained using a manometer. Heart rate, respiratory rate and mean arterial pressure were monitored throughout the procedure. Results The mean inflation pressure for plastic tubes was 56 ± 28 mmHg for method A, 20 ± 9 mmHg for method B, 35 ± 32 mmHg for method C and 46 ± 39 mmHg for method D. Pressures using silicone tubes were significantly higher than for plastic tubes, the mean registered pressures being 79 ± 39, 33 ± 16, 77 ± 50 and 92 ± 56 mmHg for methods A, B, C and D. Conclusions and Clinical Relevance None of the methods evaluated in this study can be considered effective for inflating the endotracheal tube cuff to within the optimal range when using silicone tubes. Direct measurement of the cuff pressure with a manometer is therefore recommended. 相似文献
97.
V. Romano F. Albanese S. Dumontet K. Krovacek O. Petrini V. Pasquale 《Zoonoses and public health》2012,59(8):545-548
Clostridium difficile is an emerging enteric pathogen of humans and animals with a known main reservoir in the intestinal tract of various warm‐blooded animals. This study was carried out to evaluate the prevalence of C. difficile in 150 rectal swab samples collected from cattle and goats in Switzerland. The overall prevalence of C. difficile was 6.6%. The isolates belonged to the PCR ribotypes 033, 066, 070, 003, 001 and 137. In addition, the occurrence of C. difficile in faecal samples collected from farm ground was also evaluated and C. difficile was detected in 21% (7/30) of these samples. These isolates belonged to ribotypes 033, 066, 014 and 137. Several isolates pertained to ribotypes known to cause Clostridium difficile infections in humans. 相似文献
98.
Giovanni Benelli Donato Romano Cesare Stefanini Nickolas G. Kavallieratos Christos G. Athanassiou Angelo Canale 《Journal of pest science》2017,90(2):547-556
Lateralization (i.e. left–right asymmetries in the brain and behaviour) has been documented in all vertebrate classes, while evidences for invertebrates are limited. To the best of our knowledge, there is no information about behavioural asymmetries in the order Coleoptera. In this research, we investigated the lateralization of mating traits in two major pests of stored products: the rice weevil, Sitophilus oryzae (Coleoptera: Curculionidae), and the confused flour beetle, Tribolium confusum (Coleoptera: Tenebrionidae). Both T. confusum and S. oryzae males showed population-level left-biased copulation approaches of potential mates. Interestingly, T. confusum and S. oryzae males performing left-biased copulation attempts achieved higher mating success over right-biased males. Furthermore, S. oryzae males periodically exhibited a typical head wagging behaviour, which consists of waving the rostrum laterally across the female thorax and then resting the rostrum on the mid thorax. This behaviour was right-biased, even in the majority of males that previously showed left-biased copulation attempts. The quantification of mating displays could allow comparisons with other strains, in order to evaluate the impact of a given host or of the rearing methods on the mating traits of S. oryzae and T. confusum. Overall, this is the first report of lateralization of mating traits in Coleoptera. Furthermore, this research adds basic knowledge to the reproductive behaviour of S. oryzae and T. confusum. 相似文献
99.
Sunil Nepal Vikas Kumar Harinder P. S. Makkar Timo Stadtlander Nicholas Romano Klaus Becker 《Fish physiology and biochemistry》2018,44(1):143-162
Jatropha seed cake (JSC) is an excellent source of protein but does contain some antinutritional factors (ANF) that can act as toxins and thus negatively affect the growth and health status of fish. While this can limit the use of JSC, detoxified Jatropha protein isolate (DJPI) may be a better option. An 8-week study was performed to evaluate dietary DJPI to common carp Cyprinus carpio. Five iso-nitrogenous diets (crude protein of 38%) were formulated that consisted of a C ontrol (fish meal (FM) based protein), J 50 or J 75 (50 and 75% of FM protein replaced by DJPI), and S 50 or S 75 (50 and 75% of FM protein replaced by soy protein isolate, SPI) and fed to triplicate groups of 75 carp fingerlings (75; av. wt. ± SD; 11.4 ± 0.25 g). The growth, feeding efficiencies, digestibility, plasma biochemistry, and intestinal enzymes were measured. Results showed that growth performance of fish fed the S 75- or DJPI-based diets were not significantly different from those fed the C ontrol diet, while carp fed the S 50 had significantly better growth than the J 75 diet. Fish fed the J 75 diet had significantly lower protein and lipid digestibility as well as significantly lower intestinal amylase and protease activities than all other groups. However, all plant protein-based diets led to significantly higher crude protein, crude lipid, and gross energy in the body of common carp compared to the control treatment. Plasma cholesterol and creatinine significantly decreased in the plant protein fed groups, although plasma triglyceride as well as the red blood cells count, hematocrit, albumin, globulin, total plasma protein, and lysozyme activity were higher in plant protein fed groups compared to FM fed group. White blood cells, hemoglobulin concentration, alkaline phosphatase and alanine transaminase activities, and glucose level in blood did not differ significantly among treatments. The results suggest that the DJPI is non-toxic to carp and can be used to replace FM in the diets of common carp up to 75%, but further research to potentially reduce some inherent ANF within this protein source, such as non-starch polysaccharides, may improve nutrient utilization. 相似文献
100.
Mating trophallaxis represents a fascinating strategy adopted by males of several animal species to affect the decision-making of females during mating. Among tephritids, few species perform mating trophallaxis. However, this phenomenon has been little studied in major tephritid pests. We reported the presence of indirect mating trophallaxis in Mediterranean fruit flies, Ceratitis capitata, showing its influence on the main mating traits, male mating success and female egg load. Of 219 mating pairs, only 27 of them showed mating trophallaxis, indicating that mating trophallaxis may represent a significant male energy investment. The duration of male wing vibration and the whole precopula phase was longer in pairs that mated without trophallaxis compared to the pairs displaying mating trophallaxis. Males that displayed trophallaxis performed a longer whole duration of the courtship and mating sequence, with no differences in copula duration. Male mating success was slightly increased by trophallaxis. The majority of males performing trophallaxis skipped wing vibration during courtship, while all males courting females without trophallaxis relied on wing vibration to attract females within short distances. No egg load differences were reported for females that consumed nuptial gifts over control females. Overall, our research sheds light on the relation between indirect mating trophallaxis and egg load production in medflies, providing a better understanding of sexual selective mechanisms as the basis of courtship and mating behaviour in tephritid flies. Furthermore, this behaviour could be used as a quality control parameter to assess medfly mass-reared strains, in order to improve sterile insect technique programmes. 相似文献