全文获取类型
收费全文 | 83558篇 |
免费 | 4758篇 |
国内免费 | 56篇 |
专业分类
林业 | 2907篇 |
农学 | 2276篇 |
基础科学 | 563篇 |
9182篇 | |
综合类 | 14868篇 |
农作物 | 3081篇 |
水产渔业 | 3895篇 |
畜牧兽医 | 45665篇 |
园艺 | 879篇 |
植物保护 | 5056篇 |
出版年
2018年 | 1032篇 |
2017年 | 1170篇 |
2016年 | 1084篇 |
2015年 | 935篇 |
2014年 | 1172篇 |
2013年 | 3052篇 |
2012年 | 2119篇 |
2011年 | 2695篇 |
2010年 | 1648篇 |
2009年 | 1754篇 |
2008年 | 2588篇 |
2007年 | 2402篇 |
2006年 | 2403篇 |
2005年 | 2126篇 |
2004年 | 2087篇 |
2003年 | 2076篇 |
2002年 | 1969篇 |
2001年 | 2700篇 |
2000年 | 2803篇 |
1999年 | 2131篇 |
1998年 | 813篇 |
1997年 | 823篇 |
1996年 | 807篇 |
1995年 | 1017篇 |
1994年 | 888篇 |
1993年 | 841篇 |
1992年 | 1930篇 |
1991年 | 2080篇 |
1990年 | 1923篇 |
1989年 | 1934篇 |
1988年 | 1824篇 |
1987年 | 1929篇 |
1986年 | 1975篇 |
1985年 | 1872篇 |
1984年 | 1481篇 |
1983年 | 1298篇 |
1982年 | 880篇 |
1979年 | 1366篇 |
1978年 | 1122篇 |
1977年 | 973篇 |
1976年 | 937篇 |
1975年 | 983篇 |
1974年 | 1272篇 |
1973年 | 1298篇 |
1972年 | 1234篇 |
1971年 | 1147篇 |
1970年 | 1088篇 |
1969年 | 964篇 |
1968年 | 832篇 |
1967年 | 869篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
171.
C. Avgoulas L. Bouza A. Koutrou S. Papadopoulou S. Kosmas E. Makridou P. Papastylianou D. Bilalis 《Journal of Agronomy and Crop Science》2005,191(1):1-9
Studies were conducted in four regions of central Greece (Larisa, Karditsa, Livadia, Thiva), to evaluate the productivity and fibre properties (fibre strength and fibre length) of the five most commonly grown cotton cultivars in these regions. The experiments lasted for 6 years (1995–2000). All the characteristics tested were strongly influenced by the factors ‘year’, ‘cultivar’ and ‘region’. Significant cultivar × region, year × cultivar, region × year and cultivar × region × year interactions occurred for all the characteristics studied. The cultivar Alegria had the highest seed‐cotton and lint yield, while Aria had the lowest ones. Both cultivars gave the highest mean lint percentage but the lowest mean boll weight (MBW). Alegria had the lowest fibre strength, while Aria had the highest. The Acala‐type cultivars, Acala SJ2 and Zeta 2, had intermediate seed‐cotton and lint yield, while Vered 171 had high seed‐cotton and satisfactory lint yield. The three cultivars mentioned above had the highest MBW and very good fibre strength. Positive correlation was observed between fibre strength and length. In spite of the fact that mean fibre length was statistically the same in all cultivars, it was influenced by the factor ‘year’, as a result of different weather conditions. The year 1996 was the most unfavourable one for seed‐cotton yield and MBW, because it was characterized by lower than average air temperatures and rather dry conditions for all study sites. The factor ‘region’, a combination of different climatic conditions and cultural practices, influenced significantly all the parameters studied. 相似文献
172.
173.
The clinical, clinicopathological, serial urinalysis, urinary bladder radiography and urine bacteriological culture results in a three-year-old male dog with haematuria of four days duration are presented. The dog had cystitis associated with suspected Nocardia asteroides infection. There was rapid resolution of clinical signs on institution of treatment with ampicillin. 相似文献
174.
S. A. BROWN J. D.JACOBSON S. M. HARTSFIELD 《Journal of veterinary pharmacology and therapeutics》1993,16(4):419-425
Brown, S.A., Jacobson, J.D., Hartsfield, S.M. Pharmacokinetics of midazolam administered concurrently with ketamine after intravenous bolus or infusion in dogs. J. vet. Pharmacol. Therap. 16 , 419–425. Midazolam, a water-soluble benzodiazepine tranquilizer, has been considered by some veterinary anaesthesiologists to be suitable as a combination anaesthetic agent when administered concurrently with ketamine because of its water solubility and miscibility with ketamine. However, the pharmacokinetics of midazolam have not been extensively described in the dog. Twelve clinically healthy mixed breed dogs (22.2–33.4 kg) were divided into two groups at random and were administered ketamine (10 mg/kg) and midazolam (0.5 mg/kg) either as an intravenous bolus over 30 s (group 1) or as an i.v. infusion in 0.9% NaCl (2 ml/kg) over 15 min. Blood samples were obtained immediately before the drugs were injected and periodically for 6 h afterwards. Serum concentrations were determined using gas chromatography with electron-capture detection. Serum concentrations were best described using a two-compartment open model and indicated a t½α of 1.8 min and t½β.p of 27.8 min after i.v. bolus, and t½α f 1–35 min and t½β of 31.6 min after i.v. infusion. The calculated pharmacokinetic coefficient B was significantly smaller after i.v. infusion (429 ± 244 ng/ml) than after i.v. bolus (888 ± 130 ng/ml, P = 0.004). Furthermore, AUC was significantly smaller after i.v. infusion (29 800 ±6120 ng/h/ml) than after i.v. bolus (42 500 ± 8460 ng/h/ml, P < 0.05), resulting in a larger ClB after i.v. infusion (17.4 ± 4.00 ml/min/kg than after i.v. bolus (12.1 ± 2.24 ml/min/kg, P < 0.05). No other pharmacokinetic value was significantly affected by rate of intravenous administration. 相似文献
175.
A combined ultracentrifugationl/precipitation method for the measurement of lipoprotein cholesterol concentrations was developed and validated for use with canine plasma. Very low density lipoproteins (VLDL) were isolated by flotation ultracentrifugation and low density lipoproteins (LDL) separated from high density lipoproteins (HDL) by precipitation with heparin-manganese chloride. Effective separation of these classes was confirmed by agarose gel electrophoresis of native lipoproteins and by sodium dodecyl sulphate polyacrylamide gel electrophoresis of their apolipoprotein distributions. There was trace contamination of the LDL precipitate with HDL, but this represented less than 4 and 9 per cent of the total plasma HDL in normo- and hypercholesterolaemic dogs, respectively. The intra-assay and interassay coefficients of variation for LDL- and HDL-cholesterol concentrations were between 3·3 and 6·9 per cent, and 7·2 and 9·0 per cent, respectively, for plasma cholesterol concentrations between 2·67 and 8·14 mmoll/litre. The intra-assay coefficient of variation for VLDL-cholesterol was 53·8 and 18·4 per cent at plasma cholesterol concentrations of 2·67 and 8·14 mmol/litre, respectively. The interassay coefficient of variation for VLDL was 22·5 per cent. Storage of plasma at -20°C for between two and eight weeks did not affect VLDL-cholesterol concentrations, but led to an increase in LDL-cholesterol and a decrease in HDL-cholesterol concentrations of approximately 10 per cent. The method described is appropriate for the measurement of lipoprotein concentrations in plasma from normo- and hypercholesterolaemic dogs, but samples should not be subjected to prolonged storage before analysis. 相似文献
176.
J L Becht R D Park S L Kraft P F Steyn R H Wrigley 《Veterinary Clinics of North America: Equine Practice》2001,17(1):1-18
Effective radiographic interpretation requires a veterinarian who is knowledgeable of equine limb anatomy and the various principles that affect the resulting image. The normal and its variations must be recognized and understood before the abnormal can be confidently identified as pathologic. Proper patient positioning and sound radiographic technique are mandatory if reliable diagnostic radiographs are to be produced. This review emphasizes equine foot radiographic variations of normal and pseudolesions that occur with commonly used radiographic views performed in equine practice. 相似文献
177.
178.
C. R. GREGORY dvm H. J. OLANDER dvm PhD E. J. KOCHIN vmd I. M. GOURLEY dvm PhD D. COUSYN dvm J. LEVY dvm 《Veterinary surgery : VS》1993,22(3):221-224
A 10-year-old castrated domestic shorthair cat received two renal allografts, 14 days apart, for the treatment of chronic renal failure. Oxalate nephrosis developed in both allografts, and they became nonfunctional. During the transplantation period, the cat was not exposed to exogenous sources of oxalate, and there was no evidence of primary type 2 hyperoxaluria before surgery. Urologic surgery, in particular renal transplantation, has been identified as a factor that can precipitate renal failure in human patients with decompensated renal function and hyperoxaluria. If hyperoxaluria was present before surgery in this cat, it was most likely caused by increased absorption or decreased metabolism of dietary oxalate. 相似文献
179.
180.
Ronald D. Hodges DVM Russell L. Tucker DVM James J. Brace DVM 《Veterinary radiology & ultrasound》1993,34(4):249-252