全文获取类型
收费全文 | 5311篇 |
免费 | 244篇 |
国内免费 | 3篇 |
专业分类
林业 | 430篇 |
农学 | 703篇 |
基础科学 | 108篇 |
1282篇 | |
综合类 | 197篇 |
农作物 | 438篇 |
水产渔业 | 356篇 |
畜牧兽医 | 1441篇 |
园艺 | 153篇 |
植物保护 | 450篇 |
出版年
2023年 | 44篇 |
2022年 | 94篇 |
2021年 | 116篇 |
2020年 | 163篇 |
2019年 | 195篇 |
2018年 | 231篇 |
2017年 | 244篇 |
2016年 | 207篇 |
2015年 | 159篇 |
2014年 | 194篇 |
2013年 | 472篇 |
2012年 | 272篇 |
2011年 | 283篇 |
2010年 | 236篇 |
2009年 | 191篇 |
2008年 | 201篇 |
2007年 | 214篇 |
2006年 | 212篇 |
2005年 | 158篇 |
2004年 | 109篇 |
2003年 | 116篇 |
2002年 | 98篇 |
2001年 | 90篇 |
2000年 | 84篇 |
1999年 | 75篇 |
1998年 | 56篇 |
1997年 | 53篇 |
1996年 | 42篇 |
1995年 | 41篇 |
1994年 | 35篇 |
1993年 | 33篇 |
1992年 | 40篇 |
1991年 | 50篇 |
1990年 | 44篇 |
1989年 | 47篇 |
1988年 | 56篇 |
1987年 | 44篇 |
1986年 | 35篇 |
1985年 | 29篇 |
1984年 | 32篇 |
1983年 | 31篇 |
1982年 | 26篇 |
1981年 | 27篇 |
1980年 | 38篇 |
1979年 | 48篇 |
1978年 | 24篇 |
1971年 | 24篇 |
1970年 | 38篇 |
1969年 | 28篇 |
1968年 | 26篇 |
排序方式: 共有5558条查询结果,搜索用时 15 毫秒
61.
62.
A series of substituted 4-methylcoumarins was synthesised and the members tested for their toxicity towards mycelial growth of seven phytopathogenic fungi in culture. Rhizoctonia solani, Alternaria alternata and Fusarium solani exhibited maximum sensitivity to these compounds whereas Pythium aphanidermatum, Colletotrichum falcatum, Drechslera oryzae and Macrophomina phaseolina were relatively less sensitive. 6-Ethyl-3-n- propyl-7-hydroxy4-methylcoumarin ( I ) was relatively toxic towards all fungi except C. falcatum, P. aphanidermatum and M. phaseolina. The 6-n-butyl ( III ) and 6-(1, 1, 3, 3-tetramethylbutyl) ( VI ) derivatives were highly toxic to R. solani with EC50, values of lμg ml?1. 相似文献
63.
Kumar V Kumar P Mohan K Sarkar M Suresh KP Chauhan MS Prakash BS 《Tropical animal health and production》2011,43(3):669-674
The objective of this study was to elucidate the changes in circulating levels of plasma interleukin-8 (IL-8) during peripartum
period in Murrah buffaloes (Bubalus bubalis). IL-8 was estimated in blood plasma of healthy peripartum Murrah buffaloes (n = 6) on days ±30, ±15, ±5, ±3, ±1 and 0 pre- and postpartum with respect to the day of parturition (day 0) in each of the
two different seasons (hot–humid and spring). The mean microclimate Temperature–Humidity Index (THI) during spring season
was significantly lower (p < 0.01) than the corresponding THI in hot–humid season. In both the seasons, plasma IL-8 remained lower in prepartum period
(≤46.56 ± 14.08 pg/ml during spring and ≤ 73.18 ± 18.56 pg/ml during hot–humid season) than in the postpartum period (≥51.41 ± 13.82 pg/ml
during spring and ≥ 84.13 ± 16.97 pg/ml in hot humid season). During spring, the IL-8 levels were significantly higher (P < 0.05) on days +5 and +15 postpartum in comparison to the IL-8 levels on days −30, −5, and −3 prepartum. During hot–humid
season, IL-8 level was significantly higher (P < 0.05) on day +30 as compared to the IL-8 levels on days −30 and −5 prepartum. The correlation between IL-8 and mean microclimate
THI was significant (r = 0.25, P < 0.01). From the results, it is concluded that peripartum period in buffaloes is associated with an inflammatory response
leading to significantly higher plasma IL-8 during parturition and postpartum period than in the pre-partum period. 相似文献
64.
Saxena MK Kumar AA Chaudhari P Shivachandra SB Singh VP Sharma B 《Veterinary research communications》2005,29(6):527-535
The applicability of ribotyping based on 16S and 23S rRNA was evaluated for molecular epidemiological studies. Forty-eight
isolates of Pasteurella multocida isolated from different hosts and geographical locations and one reference isolate were ribotyped. Only four ribotypes were
found. All the isolates including reference isolate from wild carnivores had the same ribotype, though they had different
serotypes. The isolate from a tiger had one band in addition to the bands present in the major ribotype. The isolates from
lions represented two ribotypes; of these ribotypes, one (r2) had an additional band of 3.6 kbp, which was absent in all other
ribotypes. The second ribotype (r4) from a lion had one band missing (6 kbp) that was present in the other ribotypes. These
isolates were further typed using ERIC-PCR and REP-PCR. With ERIC-PCR and REP-PCR, higher D values of 0.83 and 0.89 were obtained. The current study revealed that ribotyping is not a very efficient typing tool for
use in molecular epidemiology for differentiation of isolates. 相似文献
65.
Krishna Mohan Vijay Kumar Mihir Sarkar B. S. Prakash 《Tropical animal health and production》2010,42(1):21-26
The objective of this study were (1) to establish the duration of behavioral estrus signs and timing of ovulation in Murrah
buffaloes (n = 10) and (2) to determine relationship between behavioral estrus signs with change in plasma estrogen concentrations.
Estrus and its behavioral signs were detected at hourly intervals by visual observations, per recta examination of genitalia
and bull parading four times in a day for 30 minutes each. Among the behavioral signs of estrus, swollen vulva (80%) was the
best indicator of estrus followed by excitement (70%). Among the duration of behavioral estrus signs the first and longest
duration of estrus signs was swollen vulva which was seen upto 19.8 ± 0.8 h after onset of estrus. The mean total duration
of estrus symptoms from appearance to disappearance of all the behavioral estrus symptoms was 23.5 ± 1.7 h. All the behavioral
estrus symptoms were observed during the period of estrogen surge. Endocrine profile during the periestrus period showed that
the mean peak concentrations of total estrogen 23.9 ± 3.9 pg/ml occurred at 8.8 ± 1.7 h after onset of estrus. The average
number of estrus symptoms observed per animal during onset of spontaneous estrus was 5.7. Ovulation occurred after 37.4 ± 1.7 h
after onset of estrus and 13.4 ± 1.0 h after end of total estrogen surge respectively. In conclusion, our results suggest
that all signs of behavioral estrus occurred during the preovulatory rise in estrogens. The first sign of estrus to be observed
was a swollen vulva and this symptom persisted the longest. 相似文献
66.
Sachin Kumar Flavia Militino Dias Baibaswata Nayak Peter L. Collins Siba K. Samal 《Veterinary research》2010,41(5)
Avian paramyxoviruses (APMV) are divided into nine serotypes. Newcastle disease virus (APMV-1) is the most extensively characterized, while relatively little information is available for the other APMV serotypes. In the present study, we examined the pathogenicity of two divergent strains of APMV-3, Netherlands and Wisconsin, in (i) 9-day-old embryonated chicken eggs, (ii) 1-day-old specific pathogen free (SPF) chicks and turkeys, and (iii) 2-week-old SPF chickens and turkeys. The mean death time in 9-day-old embryonated chicken eggs was 112 h for APMV-3 strain Netherlands and > 168 h for strain Wisconsin. The intracerebral pathogenicity index in 1-day-old chicks for strain Netherlands was 0.39 and for strain Wisconsin was zero. Thus, both strains are lentogenic. Both the strains replicated well in brain tissue when inoculated intracerebrally in 1-day-old SPF chicks, but without causing death. Mild respiratory disease signs were observed in 1-day-old chickens and turkeys when inoculated through oculonasal route with either strain. There were no overt signs of illness in 2-weeks-old chickens and turkeys by either strain, although all the birds seroconverted after infection. The viruses were isolated predominantly from brain, lungs, spleens, trachea, pancreas and kidney. Immunohistochemistry studies also showed the presence of large amount of viral antigens in both epithelial and sub-epithelial lining of respiratory and alimentary tracts. Our result suggests systemic spread of APMV-3 even though the viral fusion glycoprotein does not contain the canonical furin proteases cleavage site. Furthermore, there was little or no disease despite systemic viral spread and abundant viral replication in all the tissues tested. 相似文献
67.
The climatic data for 17 years from 1988 to 2004 of the rainfed hill plateaus of Kandhamal district of Orissa (India) were analyzed to find out the monthly climatic index from the calculated values of effective rainfall and evapotranspiration. The 80% dependable monthly climatic index was correlated with crop coefficient and suitable cropping period and sequences for the study area were suggested based on it. The extent of investment, net return and soil loss from agriculture were estimated as per the present condition and for the suggested cropping patterns. A mathematical model was formulated for optimal allocation of area to different crop sequences with different objectives viz. minimization of soil loss, minimization of investment and maximization of net return from agriculture and was solved using linear goal programming technique. The model suggested to take up food crops in area of 1,30,777 ha and perennial grass cover in 3223 ha with a cropping intensity of 1.61 resulting in a net return of Rs 1064.775 millions sustaining soil loss to a tune of 9489.67 thousand tons per year. The model was found to be favourable in respect of higher net return of Rs 8862.34 and lesser soil loss of 23.41 tons/ha than the corresponding present values. But more investment of Rs 4489.01 per ha was required to fulfill the objectives. 相似文献
68.
Comparative study of conventional and artificial neural network-based ETo estimation models 总被引:1,自引:3,他引:1
Accurate estimation of reference crop evapotranspiration (ETo) is required for several hydrological studies and thus, in the
past, a number of ETo estimation methods have been developed with different degree of complexity and data requirement. The
present study was carried out to develop artificial neural network (ANN) based reference crop evapotranspiration models corresponding
to the ASCE’s best ranking conventional ETo estimation methods (Jensen et al. ASCE Manual and Rep. on Engrg. Pract. no. 70,
1990). Among the radiation methods, FAO-24 radiation (or Rad) method for arid and Turc method for humid region, and among
the temperature methods, FAO-24 Blaney–Criddle (or BC) method were studied. The ANN architectures corresponding to the above
three less data-intensive methods were developed for four CIMIS (California Irrigation Management Information System) stations,
namely, Davis, Castroville, Mulberry, and West Side Field station. The comprehensive ANN architecture developed by Kumar et
al. (J Irrig Drain Eng 128(4):224–233, 2002) corresponding to Penman–Monteith (PM) ETo for Davis was also tried for the other
three stations. Daily meteorological data for a period of more than 10 years (01 January 1990 to 30 June 2000) were collected
from these stations and were used to train, test, and validate the ANN models. Two learning schemes, namely, standard back-propagation
with learning rate of 0.2 and standard back-propagation with momentum having learning rate of 0.2 and momentum term of 0.95
were considered. ETo estimation performance of the ANN models was compared with the FAO-56 PM method. It was found that the
ANN models gave better closeness to FAO-56 PM ETo than the best ranking method in each category (radiation and temperature).
Thus these models can be used for ETo estimation in agreement with climatic data availability, when not all required climatic
variables are observed. 相似文献
69.
Summary This paper, second in a series of three, develops a mathematical model, using the volume balance approach, to simulate vertical and horizontal recession of border irrigation. An equation is proposed for computing Manning's roughness factor N in both laminar and transitional flow regimes in recession phases. The model has four parameters which can be determined experimentally. Experimental data from ten vegetated as well as nonvegetated borders were used to verify the model. Average difference (AD) between calculated and observed vertical recession times was less than 4.4 min, and between calculated and observed horizontal recession times less than 4.6 min for the ten experimental data sets. Average relative error (ARE) in computed horizontal recession was less than 13% for these data sets. The model was found to be especially accurate for Reynold's number between 1,800 and 2,500. 相似文献
70.
Kadarkarai Murugan Kandasamy Kalimuthu Palanisamy Mahesh Kumar Jiang-Shiou Hwang Marcello Nicoletti 《Phytoparasitica》2013,41(3):307-316
The efficacy of copepod Mesocyclops aspericornis (Daday) combined with the larvicide Bacillus sphaericus (Bs) and a plant extract of Plectranthus amboinicus leaf abstract (PALE), used jointly and singly, was studied against Aedes aegypti in the laboratory. P. amboinicus leaf extract of 20, 40, 60, 80 and 100 ppm caused significant mortality against Ae. aegypti larvae. The LC50 and LC90 values for I to IV instars larvae and pupae were 26.12, 35.36, 45.76, 52.32 and 63.82 ppm, respectively. The LC90 values for I to IV instars larvae and pupae were 82.53, 92.65, 108.06, 119.47 and 131.71 ppm, respectively. Under laboratory conditions, copepods treatment produced 7.9% predatory efficiency against 1st instar larvae of Ae. aegypti, at a copepod:larvae ratio of 1:10. When copepod treatment was combined with PALE this was increased to 8.7. The treatment of copepods combined with Bs and PALE yielded a better and more sustainable result (9.6%) than the agents used individually. This predation efficiency may be caused by detrimental effects of the P. amboinicus active principle compound (carvacrol) on the mosquito larvae. Our results suggest that the combined application of microbial insecticide (Bs), copepods and P. amboinicus leaf extract may be used to control Aedes populations. 相似文献