全文获取类型
收费全文 | 15359篇 |
免费 | 962篇 |
国内免费 | 45篇 |
专业分类
林业 | 1264篇 |
农学 | 606篇 |
基础科学 | 113篇 |
3353篇 | |
综合类 | 585篇 |
农作物 | 693篇 |
水产渔业 | 1427篇 |
畜牧兽医 | 6687篇 |
园艺 | 278篇 |
植物保护 | 1360篇 |
出版年
2023年 | 99篇 |
2022年 | 174篇 |
2021年 | 324篇 |
2020年 | 310篇 |
2019年 | 308篇 |
2018年 | 561篇 |
2017年 | 616篇 |
2016年 | 612篇 |
2015年 | 449篇 |
2014年 | 590篇 |
2013年 | 860篇 |
2012年 | 1008篇 |
2011年 | 1015篇 |
2010年 | 580篇 |
2009年 | 559篇 |
2008年 | 828篇 |
2007年 | 771篇 |
2006年 | 653篇 |
2005年 | 618篇 |
2004年 | 565篇 |
2003年 | 523篇 |
2002年 | 417篇 |
2001年 | 356篇 |
2000年 | 351篇 |
1999年 | 329篇 |
1998年 | 90篇 |
1997年 | 72篇 |
1996年 | 87篇 |
1995年 | 70篇 |
1992年 | 154篇 |
1991年 | 132篇 |
1990年 | 128篇 |
1989年 | 145篇 |
1988年 | 132篇 |
1987年 | 136篇 |
1986年 | 129篇 |
1985年 | 120篇 |
1984年 | 91篇 |
1983年 | 90篇 |
1982年 | 54篇 |
1981年 | 59篇 |
1980年 | 53篇 |
1979年 | 118篇 |
1978年 | 103篇 |
1977年 | 86篇 |
1976年 | 58篇 |
1974年 | 108篇 |
1973年 | 82篇 |
1972年 | 98篇 |
1971年 | 95篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.
Michal Vla?ín Robert Luká? Zuzana Kauerová Pavel Kohout Josef Ma?ek Eli?ka Bartheldyová ?těpán Koudelka Zina Korvasová Jana Plocková Nikola Hronová Jaroslav Turánek 《Canadian journal of veterinary research》2014,78(2):133-139
Specific contrast ultrasound is widely applied in diagnostic procedures on humans but remains underused in veterinary medicine. The objective of this study was to evaluate the use of microbubble-based contrast for rapid ultrasonographic diagnosis of thrombosis in small animals, using male New Zealand white rabbits (average weight about 3.5 kg) as a model. It was hypothesized that the use of microbubble-based contrast agents will result in a faster and more precise diagnosis in our model of thrombosis. A pro-coagulant environment had been previously established by combining endothelial denudation and external vessel wall damage. Visualization of thrombi was achieved by application of contrast microbubbles [sterically stabilized, phospholipid-based microbubbles filled with sulfur hexafluoride (SF6) gas] and ultrasonography. As a result, rapid and clear diagnosis of thrombi in aorta abdominalis was achieved within 10 to 30 s (mean: 17.3 s) by applying microbubbles as an ultrasound contrast medium. In the control group, diagnosis was not possible or took 90 to 180 s. Therefore, sterically stabilized microbubbles were found to be a suitable contrast agent for the rapid diagnosis of thrombi in an experimental model in rabbits. This contrast agent could be of practical importance in small animal practice for rapid diagnosis of thrombosis. 相似文献
52.
REASON FOR PERFORMING STUDY: Administration of omeprazole paste per os to healthy neonatal foals has been shown to effectively increase intragastric pH, but has not been evaluated in sick neonatal foals. OBJECTIVES: To determine the effect of orally administered omeprazole paste on intragastric pH in clinically ill neonatal foals requiring nasogastric intubation. METHODS: Intragastric pH was measured continuously for 24 h using an indwelling electrode and continuous data recording system in hospitalised neonatal foals age < or =2 days. Intragastric pH was measured for 12 h prior to (pretreatment period) and 12 h following (post treatment period) treatment with omeprazole paste (4 mg/kg bwt per os). All foals displayed periods of acidity (pH <4) prior to treatment. Statistical analysis compared pre- and post treatment mean and median intragastric pH, and percentage of time below pH 4. RESULTS: Eight foals were evaluated age 1-3 days, a gestational age of at least 320 days or reported to be full term. The mean (3.19 +/- 1.50 vs. 6.20 +/- 0.93) and median (4.6 +/- 1.7 vs. 6.86 +/- 0.89) pH were significantly higher and the percentage of time below pH 4 (32.25 vs. 1.1%) was significantly lower in the post treatment compared to the pretreatment period. CONCLUSION: Omeprazole paste effectively increases intragastric pH in clinically ill neonatal foals after one dose at 4 mg/kg bwt orally. 相似文献
53.
Alvarado-Esquivel C Liesenfeld O Márquez-Conde JA Cisneros-Camacho A Estrada-Martínez S Martínez-García SA González-Herrera A García-Corral N 《Zoonoses and public health》2008,55(6):306-312
Municipal waste is a potential source of infection for Toxoplasma gondii as it may contain contaminated meat with parasite tissue cysts and cat excrement with parasite oocysts. Therefore, we sought to determine the prevalence of T. gondii infection and associated characteristics in two populations exposed to municipal solid waste in Durango, Mexico. Ninety waste pickers and 83 waste workers of Durango City, Mexico were examined for T. gondii infection. They were tested for anti-T. gondii IgG and IgM antibodies using enzyme-linked immunoassays. In addition, socio-demographic and behavioural characteristics from each participant were obtained. Nineteen (21.1%) of the 90 waste pickers and seven (8.4%) of the 83 waste workers were positive for anti-T. gondii IgG antibodies. The difference in prevalence among the groups was statistically significant (P =0.03). Waste pickers aged 31-50 years showed a significantly higher prevalence (40.9%) than waste workers of the same age group (2.9%, P < 0.001). Anti-T. gondii IgM antibodies were found in two (2.2%) of the waste pickers but in none of the waste workers. The seroprevalence of T. gondii was significantly higher in workers of the waste transfer station (25.0%) than in drivers or helpers of waste vehicles (2.5%) (P =0.03). Multivariate analysis showed that T. gondii infection was associated with consuming food found in the garbage [adjusted odds ratio (OR) = 4.4; 95% confidence interval (CI) 1.6-11.8] and with lack of education (adjusted OR = 3.2; 95% CI 1.1-8.8). From this study, we conclude: (i) waste pickers may represent a risk group for T. gondii infection; (ii) lack of education might be a contributing factor for T. gondii infection; (iii) the higher the exposure to garbage, the higher the seroprevalence of T. gondii infection; (iv) Eating food products from the garbage may represent an important route for T. gondii infection. 相似文献
54.
Avilés-Nova F Espinoza-Ortega A Castelán-Ortega OA Arriaga-Jordán CM 《Tropical animal health and production》2008,40(7):509-515
Liveweight gain was evaluated in tropical Dorper X Pelibuey lambs under intensive continuous grazing of native grasslands dominated by Paspalum notatum (PN) or Axonopus compressus (AC) in the subtropics of Central Mexico. Two trials were undertaken. Trial 1 lasted 12 weeks with 10 lambs (initial weight 18 +/- 2.57 kg, 3 months old) per treatment in 2002, and Trial 2 for 13 weeks with 8 lambs (initial weight 24.0 +/- 2.0 kg, 4 months old) per treatment. Lambs were weighed once per week, and liveweight change was estimated by linear regression over day of the experiment, using individual regression coefficients as unbiased estimates of daily liveweight change; analysed in a random block design. Lambs on Trial 1 gained 0.061 kg/lamb/day on PN and 0.047 kg/lamb/day on AC (P > 0.05) at an overall mean stocking rate of 25 lambs/ha. In Trial 2, liveweight gain was significantly larger in PN (0.060 kg/lamb/day) than on AC (0.043 kg/lamb/day) (P < 0.05), at a mean stocking rate of 21.5 lambs/ha. It is concluded that intensive continuous grazing of native grasslands in the subtropics of the highlands of Central Mexico enables moderate liveweight gains for weaned lambs during the rainy season; with better results in grasslands dominated by Paspalum notatum. 相似文献
55.
Little information is known about infection, replication and transmission of porcine circovirus type 2 (PCV2) in species other than swine. Two sets of animal experiments were carried out to investigate the susceptibility of mice to PCV2 and to study their possible role in maintaining and transmitting the virus. In the first experiment 14 mice were inoculated with PCV2 by the intraperitoneal route with 5 x 10(2) TCID50 of the PCV2-ROM strain (Cadar et al., 2007). In a second experiment 24 mice were divided into two groups (A and B); mice in Group A (n = 18) were inoculated orally with 1 x 10(5) TCID50 PCV2-ROM and mice in Group B (n = 6) were left uninoculated until day 12 post inoculation (p.i.), when they were mixed with Group A. The animals were sacrificed at intervals for postmortem investigation and virus genome detection by polymerase chain reaction (PCR). The PCR results indicated that PCV2 could replicate in mice infected intraperitoneally or by the oral route, and that the virus can be transmitted directly from mouse to mouse. 相似文献
56.
Reyes R Martínez S González M Tramu G Bello AR 《Anatomia, histologia, embryologia》2008,37(4):263-271
57.
Martínez RA García D Gallego JL Onofre G Pérez J Cañón J 《Journal of animal science》2008,86(3):545-552
The genetic structure of 4 Colombian Creole cattle breeds, namely, Coste?o con Cuernos, Blanco Orejinegro (BON), Romosinuano (ROMO), and Sanmartinero (SM), was studied with an analysis of the available pedigree data. The comparison between the effective number of founders (f(e)) and the effective number of ancestors (f(a)) revealed a decrease in the genetic variation that was rather important for the ROMO and San Martinero breeds, which had the lowest f(a)/f(e) ratios (0.34 and 0.53, respectively). All breeds showed similar values for the number of equivalent generations traced, ranging from 3.1 in BON to 4.8 in ROMO. These 2 populations also had the lowest and the highest population sizes, respectively. The lowest average inbreeding coefficient considering the whole pedigree was obtained by BON (0.18%), whereas the highest was attained by ROMO (1.22%). Finally, the percentage of individuals with an inbreeding level greater than 6.25% in the reference population was high, indicating that the existing conservation management strategies could be improved to successfully maintain the genetic variability of these populations. 相似文献
58.
Perea F Soto E Hernández H González D Palomares R De Ondiz A González C 《Tropical animal health and production》2006,38(4):353-363
The aim of this study was to examine the monthly variation of the first service conception (FSC) and oestrus frequency (OF)
from 8308 artificial inseminations (AI) of 2960 crossbred dual-purpose cows on three commercial farms with improved management
located in the Maracaibo Lake Basin, Venezuela. The effects of month of the year, agroecological area (from dry tropical forest
to sub-humid tropical forest on the three farms), predominant breed (BT, Bos taurus; BI, Bos indicus), and season (December–April}; May–August; and September–November) were considered. Data were analysed using logistic regression
(FSC) and GLM (OF) from SAS. The mean FSC was 55.4% overall and 48.7%, 57.0% and 58.3% for farms A, B and C, respectively
(p < 0.01). Within the three agroecological areas (farms A, B and C), the FSC was highest during the cooler and drier months
of the year (season 1), while the lowest FSC was obtained during the months of highest rainfall and humidity (season 3) (53.3%
vs 37.4%; 58.5% vs 49.0% and 63.0% vs 52.3% on farms A, B, C, respectively; p < 0.01). In the three studied farms, OF was
higher during the first 4 months of the year; with a diminishing trend towards the end of the year (p % 0.05). In general,
BI cows had a higher FSC than BT cows, especially during the second half of the year, when environmental conditions were characterized
by higher rainfall and humidity with lower wind velocity (58.8%a 55.5%b and 46.4%c in season 1, 2 and 3 respectively; a, b, c p < 0.01). 相似文献
59.
Response and effect traits of arable weeds in agro‐ecosystems: a review of current knowledge 下载免费PDF全文
S Gaba R Perronne G Fried A Gardarin F Bretagnolle L Biju‐Duval N Colbach S Cordeau M Fernández‐Aparicio C Gauvrit S Gibot‐Leclerc J‐P Guillemin D Moreau N Munier‐Jolain F Strbik X Reboud 《Weed Research》2017,57(3):123-147
Integrating principles of ecological intensification into weed management strategies requires an understanding of the many relationships among weeds, crops and other organisms of agro‐ecosystems in a changing context. Extensively used during the last two decades in weed science, trait‐based approaches have provided general insights into weed community response to agricultural practices, and recently to understanding the effect of weeds on agro‐ecosystem functioning. In this review, we provide a holistic synthesis of the current knowledge on weed response and effect functional traits. Based on the literature and recent advances in weed science, we review current knowledge on (i) weed functional groups and ecological strategies, (ii) weed functional response traits to cropping systems and (iii) weed functional effect traits affecting agro‐ecosystem functioning. For each functional trait, we explicitly present the assumptions and evidence on the linkage between trait values and ecological functions, in response to either management practices, for example tillage, sowing and herbicides, or biotic interactions, for example crop–weed competition and pollination. Finally, we address and discuss major research avenues that may significantly improve the use of traits and the knowledge of functional diversity in weed science for the future, especially to design and implement more environmentally sustainable weed management strategies. 相似文献
60.
Suárez P 《Veterinary research》2000,31(1):47-55
Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) was first isolated in swine alveolar macrophages (SAMs) and has subsequently been reported to replicate in other cell lines. Entry of the virus inside the cell takes place by receptor-mediated endocytosis. Following the entry of the virus into the cell, several not completely understood changes take place. PRRSV has been reported to be an apoptotic-inductor virus both in vivo and in vitro. Interestingly, it has been suggested that PRRSV-induced apoptosis occurs in cells other than those in which PRRSV replicates by a bystander mechanism. In this paper the ultrastructural pathogenesis of PRRSV will be reviewed. 相似文献