全文获取类型
收费全文 | 865篇 |
免费 | 69篇 |
专业分类
林业 | 92篇 |
农学 | 32篇 |
基础科学 | 10篇 |
201篇 | |
综合类 | 39篇 |
农作物 | 51篇 |
水产渔业 | 122篇 |
畜牧兽医 | 281篇 |
园艺 | 23篇 |
植物保护 | 83篇 |
出版年
2023年 | 11篇 |
2022年 | 25篇 |
2021年 | 35篇 |
2020年 | 53篇 |
2019年 | 63篇 |
2018年 | 39篇 |
2017年 | 34篇 |
2016年 | 42篇 |
2015年 | 30篇 |
2014年 | 43篇 |
2013年 | 52篇 |
2012年 | 74篇 |
2011年 | 64篇 |
2010年 | 51篇 |
2009年 | 35篇 |
2008年 | 46篇 |
2007年 | 55篇 |
2006年 | 29篇 |
2005年 | 23篇 |
2004年 | 26篇 |
2003年 | 23篇 |
2002年 | 19篇 |
2001年 | 5篇 |
2000年 | 10篇 |
1999年 | 8篇 |
1998年 | 3篇 |
1997年 | 2篇 |
1996年 | 4篇 |
1995年 | 4篇 |
1994年 | 4篇 |
1990年 | 3篇 |
1989年 | 4篇 |
1988年 | 5篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1983年 | 3篇 |
1982年 | 3篇 |
1978年 | 1篇 |
排序方式: 共有934条查询结果,搜索用时 203 毫秒
151.
Eduardo Moreno-Jiménez Rebeca Manzano Elvira Esteban Jesús Peñalosa 《Journal of Soils and Sediments》2010,10(2):301-312
Background, aim, and scope
The mobility of arsenic in soils and its transfer to other environmental components present significant environmental risks. The management of polluted land is determined by the availability, mobility, and transfer of inorganic pollutants to different ecosystem compartments. In this paper, the fate of arsenic at this mining site has been evaluated to determine future management practises to minimise such risk. 相似文献152.
Beatriz Rumeu Manuel Nogales Rui B. Elias David P. Padilla Tiago Resendes Airam Rodríguez Francisco Valdés Eduardo Dias 《European Journal of Forest Research》2009,128(6):567-574
Phenology and female cone characteristics of the two endemic cedars (Juniperus cedrus and J. brevifolia) from the Macaronesian islands were studied. Despite their closely taxonomic affinity and their evolution under insular conditions,
different trends were recorded. Mature J. cedrus female cones were present throughout the year, while those from J. brevifolia were only present in summer and autumn. J. cedrus female cone size was significantly larger than that of J. brevifolia, a trend consistent with the presence of larger vertebrates (lizards and birds) in the Canary Islands. However, water content
was four times higher in J. brevifolia female cones, which can be related with the higher rainfall existing in the Azores. J. cedrus has two or three seeds per cone, whereas J. brevifolia frequently had three. Seeds from J. cedrus were clearly larger and heavier, coinciding with the female cone size trend. However, tetrazolium tests revealed higher viability
values in J. brevifolia. The relatively low percentage of filled seeds in J. cedrus could be a consequence of the climatic stress and limits to pollination due to fragmented populations as described for other
Juniperus species. In summary, our results reveal that some environmental factors such as the harsh conditions, high population fragmentation
and the dependence on large dispersers have compromised the fitness of J. cedrus in the Canary Islands. 相似文献
153.
Rotacio Gravoso Eduardo Mangaoang Maria Anabelle Gerona Arturo Pasa Steve Harrison 《Small-Scale Forestry》2009,8(3):275-287
In the Philippines, only a few farmers and plantation owners register their tree farms with the Department of Environment
and Natural Resources (DENR), the office in charge of tree registration. One of the major reasons is their lack of knowledge
of government policy on tree registration. To help improve the flow of information and understanding of tree registration
policies among smallholder tree farmers and other stakeholders, a Primer on Tree Registration, Harvesting, Transport and Marketing Policies on Private Land was developed. Produced through the participation of stakeholders, including tree farmers, the DENR, and local government
officers, police, and timber dealers, the Primer is highly visual and has been released in English as well as Waray–Waray
and Cebuano dialects. This paper reports findings of focus group discussions conducted to gauge user reactions to the Primer.
The Primer was considered as a valuable source of information about tree registration policies. Aside from being comprehensible,
FGD participants found it attractive, perceived it to be intended for them and free from content that confused them. However,
farmers suggested that illustrations need to be improved by making the persons portrayed more presentable and reflective of
their actual tree farm operations. Participants said that aside from the Primer, the flow of information on tree registration
policies could be improved through the use of multi-media including posters, radio broadcasts, and presentation in seminars
for farmers. 相似文献
154.
Mastrodi Salgado J Baroni Ferreira TR de Oliveira Biazotto F Dos Santos Dias CT 《Plant foods for human nutrition (Dordrecht, Netherlands)》2012,67(1):39-43
Antioxidants are compounds responsible for free radical scavenging in the body. They protect the organism from oxidative modification
of cells and tissues. These modifications have been associated with degenerative diseases, atherosclerosis and carcinogenesis.
Punica granatum displays high antioxidant potential due to the presence of phenolic compounds, which are capable of disease prevention. The
present study showed the highest antioxidant activity in pomegranate peel than in seeds and pulp. Based on these results,
pomegranate peel was used to produce dried extract that was added to commercial tomato juice and orange juice with strawberries.
Analysis to determine the content of phenolic compounds and antioxidant activity was performed on pomegranate pulp, seeds
and peel and in juices enriched with dried extract of pomegranate peel. The dried extract was responsible for a significant
increase in antioxidant activity of the juices, proportional to the concentrations added. However, although both flavors of
enriched juices displayed high antioxidant levels, the samples with higher dried extract concentrations received the lowest
scores from sensory analysis participants due to the characteristic astringent flavor of pomegranate peels. Therefore, to
obtain greater acceptance in the consumer market, we concluded that the maximum addition of dried pomegranate peel extract
is 0.5% in tomato juice and orange juice with strawberries. 相似文献
155.
CM Donado-Pestana JM Salgado A de Oliveira Rios PR Dos Santos A Jablonski 《Plant foods for human nutrition (Dordrecht, Netherlands)》2012,67(3):262-270
Intervention strategies regarding the biofortification of orange-fleshed sweet potato, which is a rich source of carotenoids for combating vitamin A deficiency, are being developed in Brazil. This study was conducted to evaluate the concentrations of individual carotenoids, total phenolic compounds and antioxidant capacity in the roots of four biofortified sweet potato cultivars that were raw or processed by four common heat treatments. HPLC, Folin-Ciocalteu, DPPH and ABTS assays were used. All cultivars showed high levels of carotenoids in raw roots, predominantly all-trans-β-carotene (79.1-128.5?mg.100?g(-1) DW), suggesting a high estimated vitamin A activity. The CNPH 1194 cultivar reported carotenoids values highest than those of other cultivars (p?0.05). The total phenolic compounds varied among cultivars and heat treatments (0.96-2.05?mg.g(-1) DW). In most cases, the heat treatments resulted in a significant decrease in the carotenoids and phenolic compounds contents as well as antioxidant capacity. Processing of flour presented the greatest losses of major carotenoids and phenolics. The phenolic compounds showed more stability than carotenoids after processing. There were significant correlations between the carotenoids and phenolic compounds and the antioxidant capacity. 相似文献
156.
Path analysis for selection of drought tolerant sugarcane genotypes through physiological components
Paulo Pedro da Silva Lailton SoaresJoão Gomes da Costa Luciana da Silva VianaJúlio César Farias de Andrade Eduardo Rebelo GonçalvesJoão Messias dos Santos Geraldo Veríssimo de Souza BarbosaVelber Xavier Nascimento Adriana Reis TodaroAlessandro Riffel Maria Fatima Grossi-de-SaMárcio Henrique Pereira Barbosa Antônio Euzébio Goulart Sant’AnaCícero Eduardo Ramalho Neto 《Industrial Crops and Products》2012,37(1):11-19
Water deficit is among the main environmental factors limiting agricultural productivity of sugarcane in Northeast Brazil by affecting virtually every aspect of plant growth, with consequent reduction of the agro-industrial productivity of this crop. This study aimed to use path analysis to evaluate the physiological components of sugarcane under two water conditions, with photosynthesis as the basic variable, in order to obtain subsidies that can help the genetic breeding of this crop by selection of superior clones with drought tolerance. The experiment was carried out in a greenhouse with a completely randomized experimental design, 4 × 2 factorial arrangements (four sugarcane genotypes × two soil moisture regimes: control, with 80-100% available water and stressed, with 0-20% water available) and with four replications. Each plot consisted of one pot with 12 kg of substrate containing one plant. Treatments were maintained at a humidity close to field capacity with daily replacement of the evapotranspired water with a water supply for 66 days of cultivation for treatments under stress. Evaluations were conducted on the fourth day after severe water stress at 70 days of cultivation. Data from nine physiological variables were considered, with six of these being used in the model after exclusion of those that were contributing to multicollinearity. Variables used in path analysis were enough to explain the variation found in photosynthesis under both water conditions. Stomatal conductance, transpiration and the SPAD index should be considered as a priority in breeding programs for sugarcane aiming to get more productive and tolerant genotypes to water stress, and selection indexes should be used with due consideration of these variables to promote gains in photosynthesis. 相似文献
157.
Eduardo Antônio Sanches Giovano Neumann César Pereira Rebechi de Toledo Robie Allan Bombardelli Pitágoras Augusto Piana Elizabeth Romagosa 《Aquaculture Research》2013,44(4):534-541
The aim of this work was to evaluate the spermatic parameters of jundia, Rhamdia quelen, semen stored for short periods under different temperatures. Fifteen males were used in a time factorial experimental design (13 × 3 × 3 × 3). The sperm was stored at: 15; 25 and 35°C and activated in water at: 15; 25 and 35°C each, respectively, within storage periods of: 0; 2; 4; 6; 8; 10; 12; 16; 20; 24; 32; 40 and 48 h after collection. The treatments were performed in triplicates and in sequential protocols every 50 h. The motility parameters were evaluated using Pearson's correlation analysis and the significant parameters (P < 0.05) were summarized using principal component analysis forming two predicted groups. Group 01 composed the following parameters: curvilinear velocity, wobble and linearity; group 02 comprised average path velocity, straight line velocity, beating cross frequency and motility rate. Effects (P < 0.05) of treatments were observed only in group 02, with interaction between time and temperature of exposure and between exposure time and water temperature. Superior results of spermatic parameters of group 02 were observed right after collection. However, the exposure and spermatic activation at 15°C assured significant results 48 h after collection when compared with 25 and 35°C. 相似文献
158.
Vanessa Dias Capriles Eveline Lopes Almeida Reinaldo Eduardo Ferreira Jos Alfredo Gomes Arêas Caroline Joy Steel Yoon Kil Chang 《Cereal Chemistry》2008,85(5):614-618
The sum of wheat flour and corn starch was replaced by 10, 20, or 30% whole amaranth flour in both conventional (C) and reduced fat (RF) pound cakes, and the effects on physical and sensory properties of the cakes were investigated. RF presented 33% fat reduction. The increasing amaranth levels darkened crust and crumb of cakes, which decreased color acceptability. Fresh amaranth‐containing cakes had similar texture characteristics to the controls, evaluated both instrumentally and sensorially. Sensory evaluation revealed that replacement by 30% amaranth flour decreased C cakes overall acceptability scores, due to its lower specific volume and darker color. Amaranth flour levels had no significant effect on overall acceptability of RF cakes. Hence, the sum of wheat flour and corn starch could be successfully replaced by up to 20% amaranth flour in C and up to 30% in RF pound cakes without negatively affecting sensory quality in fresh cakes. Moisture losses for all the cakes were similar, ≈1% per day during storage. After six days of storage, both C and RF amaranth‐containing cakes had higher hardness and chewiness values than control cakes. Further experiments involving sensory evaluation during storage are necessary to determine the exact limit of amaranth flour replacement. 相似文献
159.
Marcus André Ribeiro Correia Renato de Mello Prado Willian Natale Danilo Eduardo Rozane Diego Wyllyam do Vale 《Communications in Soil Science and Plant Analysis》2018,49(8):903-912
Soil acidity is one of the most important factors limiting crop production. The objective of this work was to evaluate the effects of limestone application on the soil chemical properties, nutrition and yield of mango plants in an orchard under implementation. The design was randomized blocks, with five limestone doses (0; 2; 4; 6 and 8 t ha?1) and four replications. Soil chemical analyses were performed (at 12, 24, 36 and 48 months after the experiment implementation) in the layers 0–20; 20–40 and 40–60 cm deep. Nutrition status and yield were assessed during the first and second crop seasons. The highest fruit yield was associated with the application of 3.9 and 3.8 t ha?1 of limestone in the 2008/09 and 2009/10 seasons, respectively, that is, the dose recommended by the literature for raising base saturation to 80%, as a function of the fertility conditions of the soil initially obtained. 相似文献
160.
Aurivan Soares Freitas Edson Ampélio Pozza Silvino Intra Moreira Maria Gilmara de Oliveira Soares Humberson Rocha Silva Eduardo Alves 《Phytoparasitica》2017,45(3):317-324
Yellow Sigatoka that is caused by Pseudocercospora musae is an important banana disease. The aim of this study was to elucidate the infection process of P. musae in banana leaves by scanning electron microscopy. Leaf samples were inoculated on the abaxial surface with P. musae and then analysed at 12, 24, 36, 48, 72, 96, 120, 144, and 168 h post inoculation (hpi) and at 36 and 50 days post inoculation (dpi). The conidia were found to be germinated between 24 and 36 hpi and penetrated through the stomata between 96 and 120 hpi, or more generally from 144 hpi. P. musae colonized the spongy parenchyma at 36 dpi and the palisade parenchyma at 50 dpi. Sporulation occurred at 50 dpi on the adaxial surface of leaves through the emergence of conidia on conidiophores through the stomata. Considering the importance of yellow Sigatoka in banana production, our results provide a better understanding of the life cycle of the fungus for treatment processes. 相似文献