全文获取类型
收费全文 | 620篇 |
免费 | 32篇 |
国内免费 | 2篇 |
专业分类
林业 | 21篇 |
农学 | 33篇 |
基础科学 | 12篇 |
67篇 | |
综合类 | 102篇 |
农作物 | 34篇 |
水产渔业 | 68篇 |
畜牧兽医 | 257篇 |
园艺 | 11篇 |
植物保护 | 49篇 |
出版年
2023年 | 10篇 |
2022年 | 4篇 |
2021年 | 6篇 |
2020年 | 9篇 |
2019年 | 9篇 |
2018年 | 18篇 |
2017年 | 19篇 |
2016年 | 13篇 |
2015年 | 12篇 |
2014年 | 14篇 |
2013年 | 30篇 |
2012年 | 33篇 |
2011年 | 30篇 |
2010年 | 28篇 |
2009年 | 19篇 |
2008年 | 19篇 |
2007年 | 25篇 |
2006年 | 33篇 |
2005年 | 34篇 |
2004年 | 27篇 |
2003年 | 16篇 |
2002年 | 13篇 |
2001年 | 8篇 |
2000年 | 6篇 |
1999年 | 11篇 |
1998年 | 13篇 |
1997年 | 11篇 |
1996年 | 5篇 |
1995年 | 10篇 |
1994年 | 8篇 |
1993年 | 5篇 |
1992年 | 7篇 |
1991年 | 6篇 |
1989年 | 10篇 |
1988年 | 10篇 |
1987年 | 9篇 |
1984年 | 6篇 |
1983年 | 4篇 |
1980年 | 4篇 |
1979年 | 4篇 |
1977年 | 5篇 |
1975年 | 4篇 |
1972年 | 10篇 |
1971年 | 7篇 |
1970年 | 6篇 |
1969年 | 5篇 |
1967年 | 3篇 |
1963年 | 3篇 |
1959年 | 5篇 |
1949年 | 3篇 |
排序方式: 共有654条查询结果,搜索用时 15 毫秒
51.
Peter J. Steer Colleen H. M. Tashiro William D. Mcillveen Ray E. Clement 《Water, air, and soil pollution》1995,82(3-4):659-674
In early February 1990, vandals set fire to a used tire storage facility near Hagersville, Ontario, Canada, During the fire, the Ontario Ministry of Environment and Energy (MOEE) monitored the site and surrounding impact zone for numerous organic contaminants. Samples of air, soil, vegetation, runoff water, and oily residue were collected and analyzed for polychlorinated dibenzo-p-dioxins (PCDD) and polychlorinated dibenzofurans (PCDF). Air samples produced complex incineration patterns with a large number of isomers detected. Total toxicity equivalents (TEQ) at 1 km downwind of the fire were an order of magnitude higher than those at 3 km downwind. Soil samples collected during the fire did not show elevated PCDD or PCDF concentrations, however, low concentrations were detected in vegetation collected at 100 m and 200 m from the site. PCDD and PCDF concentrations in the foliage decreased with time but were still detectable for at least 200 days after the fire started. As the tires burned, water used to extinguish the fire caused runoff of oil and oily water. Unique patterns of PCDDs and PCDFs were detected in these samples. 相似文献
52.
53.
Zafar TA Weaver CM Jones K Moore DR Barnes S 《Journal of agricultural and food chemistry》2004,52(10):2827-2831
The effect of inulin on isoflavone absorption and the effect of isoflavones and synergy with inulin on calcium absorption in rats was investigated. Rats (n = 48) were divided into three groups and fed inulin (50 mg/g), isoflavone (8 mg/g) or inulin + isoflavone (50 mg/g + 8 mg/g) diets for 21 days. After a 2-h fast, rats were given (45)Ca orally or intraperitoneally, together with 25 mg of calcium as calcium acetate. Blood and femurs were collected 4 days later. Sera were analyzed for isoflavones using HPLC-MS, femurs for (45)Ca by beta-scintillation counting, and total femoral calcium by atomic absorption spectroscopy. Both groups fed isoflavones had similar and significantly higher weight-adjusted total femoral calcium content compared to the inulin-fed group (p < 0.0001). (45)Ca absorption was significantly higher (p < 0.01) when isoflavones were added to the diet, and serum equol was significantly lower (p < 0.01) when inulin was added to the diet containing isoflavones. We conclude that isoflavones enhance calcium absorption, without synergy from inulin, and that inulin decreases equol production. 相似文献
54.
Schneider R Kotseridis Y Ray JL Augier C Baumes R 《Journal of agricultural and food chemistry》2003,51(11):3243-3248
[(2)H(10)]-4-Mercapto-4-methylpentan-2-one (d(10)-1), [(2)H(2)]-3-mercaptohexan-1-ol (d(2)-2), and [(2)H(5)]-3-mercaptohex-1-yl acetate (d(5)-3), deuterated analogues of impact odorants of wines, were used to determine quantitatively the natural compounds in white wines (Muscadet, Sauvignon, and Bacchus) with a stable isotope dilution assay using gas chromatography coupled either with ion trap tandem mass spectrometry (GC-ITMS-MS) or with atomic emission detection monitored on sulfur-selective acquisition (GC-AED). The thiol compounds were recovered from wines by liquid-liquid extraction, then purified from the wine extracts by covalent chromatography, and analyzed. The quantitative determination of 4-mercapto-4-methylpentan-2-one 1 in the wines that were analyzed was performed better with GC-AED than with GC-ITMS-MS under the conditions that were used. However, the detection limit of the method was higher than the odor threshold of 4-mercapto-4-methylpentan-2-one 1 in wine (5 vs 0.8 ng/L). The levels of this compound in the Sauvignon and Bacchus wines were much higher than its odor threshold, but it was not detectable in the Muscadet wines. On the contrary, GC-ITMS-MS was much more sensitive than GC-AED for detection of 3-mercaptohexan-1-ol 2 and 3-mercaptohex-1-yl acetate 3, and the detection limits were much lower than their odor thresholds in wine. The former compound was detected in all of the Muscadet wines that were analyzed at levels always higher than its odor detection threshold, while the latter occurred at levels higher than its odor threshold in only one Muscadet wine. 相似文献
55.
Rhodanese activity (RA) was studied in 4 soils, incubated under flooded and nonflooded (60% water-holding capacity) conditions. RA in 3 soils including an acid sulphate soil pokkali increased 2.5–6.0-fold (over respective nonflooded soils), while activity of the enzyme decreased markedly in flooded alluvial soil. Similarly, anaerobic incubation of nonflooded soils under N2 decreased RA in an alluvial soil, but increased it in pokkali soil. RA was negligible in soils, that had been reduced by flooding for 30 days and then sterilized by autoclaving. Rice rhizosphere soil exhibited significantly higher RA than the nonrhizosphere soil samples under flooded or nonflooded conditions. RA in aerobic soils was related to the microbial oxidation of S° to SO2?4. But, no relationship could be established between RA and S-oxidation in flooded soils and in rhizosphere soil suspensions of flooded rice plants. 相似文献
56.
S B Malhotra K A Hart H J Klamut N S Thomas S E Bodrug A H Burghes M Bobrow P S Harper M W Thompson P N Ray 《Science (New York, N.Y.)》1988,242(4879):755-759
Duchenne muscular dystrophy (DMD) and its less severe form Becker muscular dystrophy (BMD) are allelic disorders. It has been suggested that in the mutations involving BMD, the translational reading frame of messenger RNA is maintained and a smaller, though partially functional, protein is produced. In order to test this, the exon-intron boundaries of the first ten exons of the DMD gene were determined, and 29 patients were analyzed. In a number of BMD patients (mild and severe BMD), the reading frame of messenger RNA was not maintained. On the basis of these findings, a model for reinitiation from an internal start codon is suggested. 相似文献
57.
58.
Amplification and molecular cloning of HTLV-I sequences from DNA of multiple sclerosis patients 总被引:15,自引:0,他引:15
E P Reddy M Sandberg-Wollheim R V Mettus P E Ray E DeFreitas H Koprowski 《Science (New York, N.Y.)》1989,243(4890):529-533
Techniques of gene amplification, molecular cloning, and sequence analysis were used to test for the presence of sequences related to human T-lymphotropic virus type I (HTLV-I) in peripheral blood mononuclear cells of six patients with multiple sclerosis (MS) and 20 normal individuals. HTLV-I sequences were detected in all six MS patients and in one individual from the control group by DNA blot analysis and molecular cloning of amplified DNAs. The viral sequence in MS patients were associated with adherent cell populations consisting predominantly of monocytes and macrophages. Molecular cloning and nucleotide sequence analysis indicated that these amplified viral sequences were related to the HTLV-I proviral genome. 相似文献
59.
Dickerson RR Huffman GJ Luke WT Nunnermacker LJ Pickering KE Leslie AC Lindsey CG Slinn WG Kelly TJ Daum PH Delany AC Greenberg JP Zimmerman PR Boatman JF Ray JD Stedman DH 《Science (New York, N.Y.)》1987,235(4787):460-465
Acid deposition and photochemical smog are urban air pollution problems, and they remain localized as long as the sulfur, nitrogen, and hydrocarbon pollutants are confined to the lower troposphere (below about 1-kilometer altitude) where they are short-lived. If, however, the contaminants are rapidly transported to the upper troposphere, then their atmospheric residence times grow and their range of influence expands dramatically. Although this vertical transport ameliorates some of the effects of acid rain by diluting atmospheric acids, it exacerbates global tropospheric ozone production by redistributing the necessary nitrogen catalysts. Results of recent computer simulations suggest that thunderstorms are one means of rapid vertical transport. To test this hypothesis, several research aircraft near a midwestern thunderstrom measured carbon monoxide, hydrocarbons, ozone, and reactive nitrogen compounds. Their concentrations were much greater in the outflow region of the storm, up to 11 kilometers in altitude, than in surrounding air. Trace gas measurements can thus be used to track the motion of air in and around a cloud. Thunderstorms may transform local air pollution problems into regional or global atmospheric chemistry problems. 相似文献
60.
Enrichment of heavy metals and organic compounds in the surface microlayer of Narragansett Bay, Rhode Island 总被引:2,自引:0,他引:2
R A Duce J G Quinn C E Olney S R Piotrowicz B J Ray T L Wade 《Science (New York, N.Y.)》1972,176(31):161-163
Concentrations of lead, iron, nickel, copper, fatty acids, hydrocarbons, and chlorinated hydrocarbons are enriched from 1.5 to 50 times in the top 100 to 150 micrometers of Narragansett Bay water relative to the bulk water 20 centimeters below the surface. Trace metal enrichment was observed in the particulate and organic fractions but not in the inorganic fraction. If these substances are concentrated in films only a few molecular layers thick on the water surface, the actual enrichment factor in the films may be well over 10(4), resulting in extremely high localized pollutant concentrations in the surface microlayer. 相似文献