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41.
Hussein Hany A. Fouad Mohammed T. Abd El-Razik Khaled A. Abo El-Maaty Amal M. D’Ambrosio C. Scaloni A. Gomaa A. M. 《Tropical animal health and production》2020,52(6):3091-3097
Tropical Animal Health and Production - In Egypt, inadequate information on prevalence and epidemiology of caprine mastitis is available. This study was designed to investigate prevalence and... 相似文献
42.
Effect of different photoperiod cycles on metabolic rate and energy loss of both
fed and unfed young tilapia Oreochromis niloticus: Part I 总被引:1,自引:0,他引:1
ABSTRACT: The influence of different photoperiod cycles (3L : 3D, 6L : 6D, 12L : 12D, and 24L : 24D) on the metabolic rate and energy loss of either fed or unfed young tilapia Oreochromis niloticus (bodyweight 8.6–9.5 g) was investigated at 28°C. A computer-operated respirometer with a closed tank was used to prevent water from evaporating into the air or condensing from the air. The photoperiods acted as strong Zeitgeber (i.e., cue or synchronizer) during the experiments with either fed or unfed fish. A photoperiod-mediated metabolic cycle was demonstrated in fed and unfed fish in which oxygen consumption was higher during the light phase compared with during the dark phase for all photoperiods. Mean oxygen consumption during the 3L : 3D, 6L : 6D, 12L : 12D, and 24L : 24D periods for fed and unfed fish were 685.06 mg/kg per h and 299.33 mg/kg per h; 658.52 mg/kg per h and 284.80 mg/kg per h; 591.09 mg/kg per h and 249.62 mg/kg per h; and 500.64 mg/kg per h and 239.14 mg/kg per h, respectively. The highest post-prandial increase in energy loss was recorded during the 3L : 3D period (145.88 kJ/kg per day), followed by 141.19 kJ/kg per day during the 6L : 6D, 128.70 kJ/kg per day during the 12L : 12D, and 99.92 kJ/kg per day during the 24L : 24D periods. The results suggest that higher energy conservation would be achieved if fish are exposed to longer rather than shorter photoperiod cycles. 相似文献
43.
Abdus Sattar Amal Badshah Aurangzeb 《Plant foods for human nutrition (Dordrecht, Netherlands)》1995,47(1):63-70
Biosynthesis of ascorbic acid in irradiated and unirradiated germinating rapeseed cultivars was studied at ambient room temperature (20–35 °C). Appreciable quantities of ascorbic acid (19.8–24.1 mg/100 g) were detected in the seeds and synthesis of this vitamin increased significantly (three fold) with increasing germination time depending upon rapeseed cultivars (p<0.05). Soaking of seeds in tap water (1:2) for 24 hours resulted in the decrease of the vitamin in each case. Among the radiation treatments (0.05–0.20 kGy), maximum amounts of ascorbic acid were found in 0.10 kGy (342.1 mg/100 g dry weight) and 0.15 kGy (113.8 mg/100 g wet weight) samples after 96 hours of germination. An overall significant linear relation (r=0.96) was observed between vitamin biosynthesis and germination time upto 96 hours in rapeseed. 相似文献
44.
Optimal Stocking Density with the Provision of Self‐feeders for Striped Knifejaw,Oplegnathus fasciatus (Temminck and Schlegel 1844) 下载免费PDF全文
To determine the optimal stocking density, three densities of 5 (SD5), 10 (SD10), and 15 kg/m3 (SD15) were used to culture striped knifejaw, Oplegnathus fasciatus, for 10 wk. A total of 10, 20, or 30 juveniles with mean weights of approximately 96 g were stocked into one of nine 300‐L tanks (with an initial water volume of 200 L) and fed with commercial feed via self‐feeders. The fish were sampled at 4 and 8 wk, and the stocking density was maintained by adjusting the water volume of the tanks. The final body weights in SD10 and SD15 were 183.8 and 178.9 g, respectively, which were significantly higher than 161.7 g in SD5 (P< 0.05). However, there was no significant difference between the SD10 and SD15 (P > 0.05). A similar trend was observed in the specific growth rate among the treatments. Feed efficiency and the lipid retention efficiency were both significantly higher in SD10 than that in SD5. The plasma levels of cortisol, glucose, and total protein were similar among the treatments. These results clearly suggest that densities of 10 and 15 kg/m3 can be used to improve the growth performance of striped knifejaw, O. fasciatus, when fed with a self‐feeder. 相似文献
45.
Amal A. Mohamed Mohamed Ahmed Matter Mohamed Ramadan Rady 《Journal of Crop Science and Biotechnology》2010,13(2):61-68
The variation among some barley germplasm (Giza 123, Giza 127, Giza 130, Desert, and Sinai) was investigated comparatively
at the molecular and biochemical levels. Leaf DNAs extracted from different barley germplasm were amplified with randomly
chosen primers in a Polymerase Chain Reaction (PCR) using Random Amplified Polymorphic DNA (RAPD) technique. Only five primers
amplified all DNA templates among 15 primers. Primers generated a total of 112 DNA fragments ranged from 1.2 to 0.1 kbp. Out
of the 112 fragments, 16 (14.29%) were polymorphic. The result indicated that fragments generated per primer, with an average
of 22.4 products, where the number of polymorphic bands per primer, with an average of 3.2 polymorphic bands. In addition,
the genetic variation in the anti-nutritional factors and nutrient composition of the same genotypes were determined. A wide
variation in total phenolic, phytic, tannin, vicine, and saponin contents was found among these germplasm. The range of total
phenolic was 3.83 to 7.50 mg g−1 d.w. Among all germplasm, Desert germplasm was characterized by the highest tannin content. However, saponin ranged between
5.66 mg g−1 d.w. (in Giza 123) to 9.21 mg g−1 d.w (in Sinai) germplasm. The concentrations of the phytic acid were generally low, ranging between 0.99 to 6.78 mg g−1 d.w. The germplasm Desert and Sinai had the highest level of vicine, 1.89 and 1.87 mg g−1 d.w., respectively. The results of the molecular characterization and anti-nutritional content can be used as the starting
point needed to identify the valuable Egyptian barley germplasm. 相似文献
46.
Dietary medicinal herbs and enzyme treated fish meal improve stress resistances and growth performance at early juvenile stage of red sea bream Pagrus major 下载免费PDF全文
Osamu Takaoka Seung‐Cheol Ji Katsuya Ishimaru Si‐Woo Lee Gwan‐Sik Jeong Amal Biswas Kenji Takii 《Aquaculture Research》2016,47(2):390-397
Red sea bream Pagrus major (RSB) weighing 0.09 g were fed on test diets, composed of 65% fish meal supplemented with 0.49% Crataegi fructus (Cf) and a mixture of Massa medicata, Cf, Artemisia capillaries and Cnidium officinale (HM) or a control diet without herbs, in trial 1. After air exposure and anaesthesia treatment, higher stress tolerances were obtained in herbal groups than control group. Moreover, after challenge test with Vibrio anguillarum, mortalities of the herbal groups were lower than the control group. There was no significant difference in growth performance among the treatments. Feed efficiency (FE) of the test groups was 124–141%. In trial 2, RSB weighing 0.11 g were fed on diets composed of 35% fish meal and 30% enzyme treated fish meal (EFM) with the same herbal treatments as trial 1. The herbal groups revealed higher final body weight and specific growth rate (SGR) and lower daily feed intake than those of the control group. The FE of test groups was 172–203%. These results indicate that the dietary herbs supplementation acts not only as recovery enhancer for some rearing stresses but also as growth enhancer, which is accelerated with dietary EFM in the early juvenile stage of red sea bream. 相似文献
47.
48.
Water quality influences the presence of Streptococcus agalactiae in cage cultured red hybrid tilapia,Oreochromis niloticus × Oreochromis mossambicus 下载免费PDF全文
Mohammad Noor Azmai Amal Mohd Zamri Saad Abdullah Siti Zahrah Abd Rashid Zulkafli 《Aquaculture Research》2015,46(2):313-323
Attempts were made to identify the association between water quality parameters and the presence of Streptococcus agalactiae in cage cultured red hybrid tilapia, Oreochromis niloticus × O. mossambicus. Fish from commercial floating net cage‐culture systems in a river and lake were randomly sampled over a 24‐month period. Swabs from the brains, eyes and kidneys were streaked directly onto blood agar to isolate S. agalactiae. Water temperature, dissolved oxygen, pH, clarity, ammonia, nitrite, sulfide, rate of water flow and depth of water at sampling sites were measured at the same time of fish sampling. The prevalence of fish that were cultured positive to S. agalactiae was significantly higher in lake compared with river. The length and weight of the infected fish were between 9 and 33 cm, and between 20 and 760 g respectively. There was a significant and positive strong correlation between the presence of S. agalactiae and fish mortalities in lake. All water quality parameters showed significant differences between river and lake. However, only water temperature, clarity and pH of lake and the ammonia, temperature and dissolved oxygen in river showed significant correlation with the presence of S. agalactiae in the cultured fish. It was concluded that several unfavourable water quality in the fish farm influencing the presence of S. agalactiae in cultured red hybrid tilapia. 相似文献
49.
A study was conducted at the experimental farm of Faculty of Agriculture, Ain Shams University, Cairo, Egypt, during two successive summer seasons (2014 and 2015) to investigate the effects of arbuscular mycorrhizal fungi (Glomus irradicans 10% w/w), Bacillus megaterium (10?ml/pot) and brassinosteroids (24-EBL, C28H48O6; 2?µM) on growth, nutrient absorption, chlorophyll, proline content, antioxidant enzymes activity and fruit yield of sweet pepper plants (Capsicum annuum L.) cv. Marconi. Plants were grown under three levels of salinity (0, 25 and 50?mM). The obtained results showed that plants grown under non-saline water (0?mM NaCl), with or without treatments, significantly gave the most vigorous vegetative growth and had the highest fruit yield compared with those grown under salt stress conditions. All anti-salinity treatments (Mycorrhiza, Bacillus and Brassinosteroids) improved growth when compared with untreated plants (control). Plants inoculated with mycorrhiza or treated with brassinosteroids showed better vegetative growth and shoot biomass (total fresh and dry weight per plant), chlorophyll a and b concentrations, antioxidant content expressed as total soluble phenols and proline concentrations at all studied salinity levels followed by plants inoculated with Bacillus megaterium compared with control plants which showed severe growth retardant especially under higher salt concentration (50?mM). Carotenoids concentration increased proportionally with the increase of salinity concentration. The maximum leaf relative water content (LRWC) and lowest values of membrane permeability (MP) were significantly observed with mychorhiza inoculated plants and brassinosteroid application respectively, followed by Bacillus inoculated plants. Antioxidant enzyme activity were highest in plants irrigated with moderate saline water (25?mM) than plants under high salinity irrigation water (50?mM) except polyphenol oxidase (PPO) as compared with unstressed plants (0?mM). Mycorrhizal inoculated plants accumulated higher K and lower Na and Cl followed by plants treated with brassinosteroids and then plants inoculated with Bacillus megaterium. Anti-salinity treatments positively enhanced fruit yield of sweet pepper plants under all salinity stress levels and the highest fruit yield were significantly observed with brassinosteroid application followed by mychorhiza inoculated plants and then Bacillus inoculated plants. 相似文献
50.
Chandan Kumar Maiti Surjit Sen Amal Kanti Paul Krishnendu Acharya 《Journal of General Plant Pathology》2007,73(5):377-378
Leaf blight disease was found on Gloriosa superba L. (Liliaceae), an endangered, herbaceous, perennial, climbing lily that produces colchicine, in West Bengal, India in 2004.
Small brownish spots on leaves developed into concentric rings, which eventually darkened and coalesced to blight the entire
leaf. The causal fungus was morphologically identified as Alternaria alternata (Fr.) Keissler. This is the first record of A. alternata on G. superba. 相似文献