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排序方式: 共有75条查询结果,搜索用时 15 毫秒
31.
Soliman Mahmoud Abdel Wahab Hamza Ali Fawzy Zahran Nagwan Fahmy Bassioni Ghada 《植物病害和植物保护杂志》2021,128(6):1565-1574
Journal of Plant Diseases and Protection - In the present study, one Streptomyces species was isolated from a soil sample that was collected in Khafr El Shikh Governorate. Actinomycetes are... 相似文献
32.
Md Lutfor Rahman Bablu Hira Mandal Shaheen M. Sarkar Nor Asiken Abdul Wahab Mashitah Mohd Yusoff Sazmal E. Arshad Baba Musta 《Fibers and Polymers》2016,17(4):521-532
A cellulose-graft-poly(methyl acrylate) was synthesized by free radical initiating process and the ester functional groups were converted into the hydroxamic acid ligand. The intermediate and final products are characterized by FT-IR, FE-SEM, HR-TEM and XPS technique. The pH of the solution acts as a key factor in achieving optical color signals of metalcomplexation. The reflectance spectra of the [Cu-ligand]n+ complex was found to be a highest absorbance at 99.8 % at pH 6 and it was increased upon increasing of Cu2+ ion concentrations and a broad peak at 700 nm was observed which indicated the charge transfer (π-π transition) metals-Cu complex. The adsorption capacity of copper was found to be superior (336 mg g?1) rather than other transition metals such as Fe3+, Co3+, Cr3+, Ni2+, Mn2+ and Zn2+ were 310, 295, 288, 250, 248 and 225 mg g-1, respectively at pH 6. The experimental data of all metal ions fitted significantly with the pseudo-second-order rate equation. The transition metal ions sorption onto ligand were well fitted with the Langmuir isotherm model (R2>0.99), which suggested that the cellulose-based adsorbent known as poly(hydroxamic acid) ligand surface is homogenous and monolayer. The reusability of the poly(hydroxamic acid) ligand was checked by the sorption/desorption process up to ten cycles without any significant loss in its original sensing and removal performances. 相似文献
33.
Ismail M. Madany Abbas Ali A. Wahab Z. Al-Alawi 《Water, air, and soil pollution》1996,91(3-4):233-248
A total of 162 fish and shellfish samples representing important species have been collected from different coastal areas of Bahrain in the Arabian Gulf, and analyzed for lead, cadmium, mercury, and arsenic using electrothermal atomic absorption spectrophotometric method. The dverall mean levels for Pb, Cd, Hg and As in fish samples were 0.132, 0.032, 0.084 and 1.7 µg g?1 wet weight, respectively, whereas for shellfish they were 0.149, 0.045, 0.042 and 3.61 µg g?1 wet weight. These values indicate higher levels of metals in shellfish when compared with fish, except for mercury, and reveal that generally the levels of metals in these organisms are lower than existing guidelines, except for arsenic. The provisional tolerable weekly intake of Pb, Cd, Hg and As through fish was estimated to be 0.7, 0.17, 0.45 and 9 µg kg?1 bodyweight per week, respectively. Our results did not reveal a clear pattern regarding variations of metals concentration between areas and species. 相似文献
34.
Siamak Shirani Bidabadi Maziah Mahmood Sariah Meon Zakaria Wahab Cyrus Ghobadi 《Journal of Crop Science and Biotechnology》2011,14(4):255-263
Water stress is a serious environmental restriction to banana productivity. Hence, the objective of this study was to employ
in vitro mutagenesis in selection and characterization of drought tolerant lines in banana. In vitro culture responses of ethyl methanesulphonate induced variants of banana cultivars, ‘Berangan Intan’ and ‘Berangan’ were assessed
concerning morphological, physiological and molecular characteristics involving mutated shoot tips on MS medium supplemented
with 30 g L−1 PEG. The results showed that water stress tolerant lines could be obtained from induced variations. Variants L2–5 and L1–5 showed the highest number of leaves per shoot (2.37 and 2.06, respectively) and the lowest were recorded in the parental
lines L1-1 and L2-1 (0.81 and 0.93, respectively). Fresh weight and shoot vigor rate indicated the maximum increase in the water stress tolerant
lines compared with susceptible and non-mutated parental lines. L2–5 exhibited the most increase in the chlorophyll and the most reduction in H2O2 and MDA contents when exposed to water stress. Under PEG treatment, proline and relative water content was enhanced in L1–5, L2–5, L2–6, L1–6, L2–3, L2–4, and L1–4. RAPD analysis revealed polymorphism (18.35 and 21.48%) among variants derived from ‘Berangan Intan’ and ‘Berangan’, respectively.
The amplified fragments generated by primers opc01, opc04, opa11, and opa20 observed to be specific for L2–5 and L1–5 as more tolerant followed by L2–3, L1–4, L2–6, and L1–6 as moderately tolerant lines against water stress. This study demonstrates the application of in vitro mutagenesis in selection of water stress tolerant lines of banana as a convenient, cheap, and rapid technique. 相似文献
35.
A polyculture experiment with the large carp rohu, catla and either mrigal or common carp (as cash crop fish), and the small indigenous fish punti (as food for the farmer's family) was carried out at Bangladesh Agricultural University, Mymensingh. The main objectives were to compare polycultures of large carp in which the bottom feeder is either the native mrigal or the exotic common carp, and to assess the effects of adding the small indigenous species punti to those polycultures. The results of fish–fish interactions and overall fish production have already been reported. The present paper presents the effects on the water quality, and discusses fish–environment interactions. The main conclusions are: time changes in the pond environment were stronger than fish composition effects. The main practice affecting water quality was liming, that incresed alkalinity, pH and water transparency and decreased ammonia. Rain affected photosynthesis and the match‐mismatch of the two steps of nitrification. The more that bottom feeding fish species disrupt the mud bottom, the stronger their effects on pond environment. Common carp produce the strongest disruption of the mud bottom, followed by punti and then by mrigal. Mud disruption produced by common carp leads to a stronger liming effect, nutrient release into the water, and provides more particles that rain‐floods wash out, facilitating the mismatch of the two steps of nitrification, and increased phosphorus adsorption into the mud bottom. Mud disruption by punti is only enough to improve the liming effect. Mud disruption by mrigal is the least, hence less particles are resuspended, nitrification is not affected during floods and relatively more phosphate remains in the water available for photosynthesis. The bottom feeder common carp can be seen not only as a target‐cultured fish but also as a management tool. Farmers can get double benefit in introducing common carp in the ponds as it enhances the effectiveness of lime application and increases the availability of nutrients to phytoplankton. Through the manipulation of species in the polyculture alone, farmers can maintain the environment better and also reduce input costs. 相似文献
36.
The effects of introduction of common carp, Cyprinus carpio (L.). in polyculture with major Indian carps and silver carp were studied in fertilized and fed earthen ponds in Mymensingh, Bangladesh. Bottom-dwelling common carp were found to exert an influence on the quality and quantity of planktonic food organisms. The presence of common carp significantly increased (P < 0.05) the growth of other carps including the bottom-feeder mrigal. Cirrhinus mrigala (Hamilton). A significantly higher fish yield (P < 0.05) was observed in the fish ponds containing common carp when the combined yields of all species in three treatments were compared. 相似文献
37.
M E Azim M A Wahab A A van Dam M C M Beveridge A Milstein & M C J Verdegem 《Aquaculture Research》2001,32(9):749-760
The effects of four rates of application of fertilizer, with cow manure (3000 kg ha−1), urea (100 (kg ha−1) and triple super phosphate (TSP) (100 kg ha−1) (treatment F)), treatment F × 0.5 (treatment 0.5F), treatment F × 1.5 (treatment 1.5F) and treatment F × 2 (treatment 2F), on periphyton, plankton and water quality in tropical freshwater ponds were studied. The highest periphyton biomass in terms of dry matter (3.27 mg cm−2 substrate), ash-free dry matter (2.06 mg cm−2 substrate) and chlorophyll a (7.49 µg cm−2 substrate) developed in treatment 1.5F. The ash content of periphyton was lower in treatment 1.5F (38% of dry matter) than in other treatments (57–66% of dry matter). Total ammonia and chlorophyll a of water increased with fertilization rate. Treatment 1.5F (cow manure, urea and TSP at rates of 4500, 150 and 150 kg ha−1 respectively) appears to be the optimum, yielding high quantity and quality periphyton. By supplying a substrate area for periphyton equivalent to the pond surface, it was estimated that this level of fertilization could support a fish production of around 5000 kg ha−1 y−1, without recourse to supplementary food. 相似文献
38.
Impacts of decentralized fish fingerling production in irrigated rice fields in Northwest Bangladesh
Mohammad Mahfujul Haque David C Little Benoy K Barman Md Abdul Wahab Trevor C Telfer 《Aquaculture Research》2014,45(4):655-674
Rice field‐based fish seed production (RFFSP) has become established in parts of Northwest Bangladesh (NWB) as part of promoting improved rice‐based livelihoods. The impact of RFFSP on adopting households in terms of interactions of assets and other activities was assessed in a comparison of seed‐producing (RF; n = 60) and non‐seed‐producing (NRF; n = 58) households that were sampled randomly and ranked as poor, intermediate and better‐off. Adoption of RFFSP was not constrained by illiteracy of the household head, the size or ownership status of ponds, or lack of ownership of land or an irrigation pump. Poorer and intermediate households had smaller RF plots and lower production of fingerlings (kg per household) compared with the better‐off, although production efficiency (kg ha?1) was higher. Restocking of fingerlings in RF household ponds increased productivity by 60% over NRF. Fish consumption of better‐off RF households exceeded NFR by 50%. Among the poor, seasonal benefits of income from sales and subsistence consumption of fingerlings were significant. Rice production in irrigated, and income in both irrigated and rain‐fed seasons was higher, and production costs lower, in riceplots producing fish than in rice‐only plots. Implications for supporting the innovation networks promoting and establishing RFFSP among rice growers, are discussed. 相似文献
39.
K Friedman S Gabriel O Abe A Adnan Nuruddin A Ali R Bidin Raja Hassan S X Cadrin A Cornish T De Meulenaer Dharmadi Fahmi L Huu Tuan Anh D Kachelriess L Kissol Jr. T Krajangdara A Rahman Wahab W Tanoue C Tharith F Torres Jr. W Wanchana S Win K Yokawa Y Ye 《Fish and Fisheries》2018,19(4):662-676
CITES (the Convention on International Trade in Endangered Species of Wild Fauna and Flora) aims to ensure that international trade in specimens of wild animals and plants does not threaten their survival. However, measuring the effectiveness and impacts of these trade regulations for commercially exploited aquatic species remains challenging. This study highlights observed or documented changes in elasmobranch fisheries in eight Southeast Asian countries before and after the listing of sharks and rays in CITES’ Appendix II, and the influence of CITES across five pillars or sectors of a “fishery assessment framework” developed especially for this purpose. Fisheries experts reported change was most common in the “governance” (e.g., policy, regulation and compliance) and “fisher(y)” sectors (e.g., structure and effort) of the assessment framework. The smallest change was recorded in “markets” (e.g., structures and prices) and “sociocultural” sectors (e.g., consumption, livelihoods and community awareness). Overall, the study demonstrates a measurable, albeit small, mostly positive influence of CITES in five of eight countries, while noting predominantly negative influences across two, and ongoing challenges for all in maintaining legal trade of these CITES‐listed species. The study concludes by offering guidance on future needs: most notably, more effort for long‐term collection of fundamental fisher‐, stock‐ and market‐related data to inform adaptive management and facilitation of legal trade where it is shown to be sustainable. Furthermore, as many of the shark and ray species under CITES provisions are transboundary stocks, increased support for communication and cooperation among regional fishery stakeholders is an ongoing need. 相似文献
40.
Mrityunjoy Kunda M Ekram Azim M Abdul Wahab Somen Dewan M Abdul Majid & Shakuntala H Thilsted 《Aquaculture Research》2009,40(9):1089-1098
An on-farm trial was carried out from February to June 2006 to evaluate the growth and production performance of catla ( Catla catla ) and tilapia ( Oreochromis niloticus ) with freshwater prawn ( Macrobrachium rosenbergii ) and mola ( Amblypharyngodon mola ) in farmer's rice fields. In all treatments, 20 000 mola ha−1 and 20 000 prawn ha−1 were stocked. Besides, stocking included 2500 catla ha−1 in treatment-I, 2500 tilapia ha−1 in treatment-II and catla and tilapia at 1250 ha−1 each in treatment-III . Prawns were fed in the evening with pellets at a feeding rate of 3–8% body weight (initially 8% and gradually decreased to 3%). Catla and tilapia were fed in the morning with a paste of mustard oil cake and rice bran at a feeding rate of 3% body weight. Significantly higher combined production of fish and prawn observed was 2142 kg ha−1 in treatment-I. The benefit:cost ratio was found to be significantly higher in treatment-I than in treatment-II and there were no differences between treatments I and III. From the production and economic point of view, treatment-I was found to be the best proposition for the rotational rice–fish culture systems. 相似文献