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61.
Mónica Beatriz Betancor Sigve Nordrum Eyad Atalah María José Caballero Tibiábin Benítez‐Santana Javier Roo Lidia Robaina Marisol Izquierdo 《Aquaculture Research》2012,43(3):395-406
The objective of this study was to evaluate three products derived from krill as sources of essential fatty acids, protein and, particularly, phospholipids in microdiets for larval gilthead seabream (Sparus aurata). Their effect on larval performance, biochemical composition and histological development was investigated. The addition of krill phospholipids, rich in highly unsaturated fatty acids, improved larval sea bream growth in terms of weight and length, enhanced hepatic utilization of dietary lipids and reduced the incidence of enterocyte injuries. These results confirm the higher nutritional value of marine phospholipids for the early development of marine fish larvae in comparison with soybean phospholipids. 相似文献
62.
Use of Ox‐Aquaculture© for disinfection of live prey and meagre larvae,Argyrosomus regius (Asso, 1801)
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Live prey used for marine larval fish (rotifers and Artemia) as well as intensive larval rearing conditions are susceptible to the proliferation of bacteria that are the cause for reduced growth and larval mortality. Hydrogen peroxide has been recently proved a good disinfectant in aquaculture, either for eggs, larvae or live prey. In this study the effects of a hydrogen peroxide‐based product, Ox‐Aquaculture©, on live prey (rotifers and Artemia) and meagre larvae bacterial load, composition and final status have been tested. A 34.6% reduction of total heterotrophic bacteria and 59.7% of Vibrionaceae were obtained when rotifers were exposed for 15 min to 40 mg L?1 of the product. A 34.3% reduction of total heterotrophic bacteria and 37.7% of Vibrionaceae were obtained when Artemia were exposed for 5 min to 8000 mg L?1 of the product. More than 95% reduction of total heterotrophic bacteria and 75% of Vibrionaceae were obtained when meagre larvae were exposed for 1 h to 20 mg L?1 of the product. Furthermore, disinfection of enriched live prey with the product did not change the fatty acid composition and survival of the live prey and improved final larval survival. 相似文献
63.
Enrique Combatt Caballero Jaime Mercado Lázaro Dairo Pérez Polo 《Communications in Soil Science and Plant Analysis》2016,47(20):2281-2291
Cultivation of a teak crop in acid soils needs adequate agronomic management of these characteristics of high acidity and low nutrient supply to obtain high yields in wood. This work evaluated the effect of liming and application of boron in teak plants during early stage of growth in acid soils from Córdoba, Colombia. The experiments were conducted in the greenhouse and soils laboratory of the Faculty of Agricultural Sciences by using acid soil limed with calcium hydroxide (Ca(OH)2) and fertilized with boron. The treatments were chosen according to the Box Bernard augmented matrix 3, with dosages of Ca(OH)2 from 300 to 5700 kg ha?1 and boron from 0.3 to 5.225 kg ha?1, using three repetitions per treatment. Data obtained on boron in the soils (Bs) and in the plant (Bp), foliar area (AF), leaf dry mass (MSH), and roots (MSR) were analyzed through means tests and regressions from response surfaces (p ≤ 0.05). The results indicated increased pH and in the soil’s exchangeable calcium (Ca). To reach the maximal AF, the dosages of 2.26 kg ha?1 of boron (B) and 4522.6 kg ha?1 of Ca(OH)2 were estimated; for MSH, stem, and roots boron, dosages ranged between 2.02 and 5.225, with the dosage of 5700 kg ha?1 of Ca(OH)2 in all the variables evaluated. Application of calcium hydroxide also showed positive effect in leaf, stem, and MSR gain of teak seedlings during early growth stages. Fertilization with boron (B) did not show significant effect upon growth of dry masses of the parts evaluated. 相似文献
64.
65.
Bruno?Rodríguez-Morgado Pablo?Caballero?Jiménez Manuel?Tejada?Moral Juan?Parrado?RubioEmail author 《Biology and Fertility of Soils》2017,53(4):389-396
The l-lactic acid obtained from a whey waste valorization process decreased pH and increased phosphate solubilization of a Plagic Antrosol soil. This behavior was reversible due to the complete and rapid degradation of lactic acid by soil microorganisms, leading to a strong soil biological stimulation. Both dehydrogenase (DHA) and acid phosphomonoesterase (APA) activities were also significantly stimulated, due to the stimulation of microbial activity, whereas the β-glucosidase activity was unaffected. There was also a shift in bacterial biodiversity with growth of bacterial strains using lactic acid as a C source. The bacteria enriched belonged to the plant growth-promoting bacteria (PGPb), such as Rhizobium and Azotobacter genus, involved in N2 fixation, and Pseudomonas and Bacillus genera, involved in phosphorous bioavailability. We conclude that lactic acid application improves fertility parameters on soils. Further research at field scale is needed to confirm these results. 相似文献
66.
This paper studies the effect of an integral suspension of Lepidium latifolium on experimental induced prostate hyperplasia, in rats. Oral treatment with 0.86 mg kg(-1) day(-1) for 6 months, significantly reduced prostate size and volume in castrated rats where the hyperplasia were induced by steroid treatment. 相似文献
67.
Ortega C Parilla G De Balogh K De Rosa M Gimeno O Estol L Dobosh D Leguia G Falcon N Fonseca A Torres M Caballero M Quiros J Vilhena MC Villamil LC Cediel N De Meneghi D 《Journal of veterinary medical education》2007,34(4):492-496
Continued contact between humans and animals, in combination with the ever-increasing movement of human and animal populations that is one effect of globalization, contributes to the spread of diseases, often with detrimental effects on public health. This has led professionals involved in both animal health and public health to recognize veterinary public health (VPH) as a key area for their activities to address the human-animal interface. Veterinarians, a profession with major involvement in this field, are in need of specific knowledge and skills to prevent and control public-health problems. As a result, VPH must be directly integrated into veterinary educational programs. At present, only few veterinary schools have specific VPH programs; in most institutions, VPH does not feature as a specific subject in either undergraduate or post-graduate curricula. SAPUVET and SAPUVETNET II are network projects supported by the ALFA program of the European Union (EU). Their main objectives are to reach a common understanding between European and Latin American universities in the definition of the areas in which VPH is important in their respective countries, and to design a harmonized training program for veterinarians in VPH, by making use of new technological applications and innovative teaching methodologies. The elaboration of educational material in combination with case studies presenting real-life problems provides a basis to apply the knowledge acquired on VPH. It is envisaged that the material and modules developed during the two projects will be integrated into the veterinary curricula of the participating universities, as well as in other partner organizations. 相似文献
68.
Andrea Martínez-Ballest Carlos Martorell Javier Caballero 《Forest Ecology and Management》2008,256(6):1320-1324
Palm leaves are an important resource for family households. The effect of harvest on leaf production, growth and fecundity of wild individual palm trees has been studied, but little is known about palm harvest in agro-forestry systems. In the Maya area of the Yucatán Peninsula, Mexico, leaves of the xa’an palm (Sabal yapa, and Sabal mexicana) have been used since pre-Hispanic days for thatching the roofs of traditional Maya houses. The Maya have introduced xa’an palms in homegardens and the care they provide them improves their growth. Maya householders agree on what they consider to be the best harvest intensity for xa’an, recommending one or two harvest events per year, and leaving one or two leaves in each event; however, there is not ecological information documenting whether the traditional harvesting practices are the most adequate to maintain or increase leaf production, and their effect on the growth and fecundity of the palm trees. In Maxcanú, Yucatán, we studied eight family homegardens with S. yapa and S. mexicana. The selected individuals from each homegarden (n = 252) underwent six harvest treatments for 2 years C: control, no harvest, Al: annual harvest, leaving three leaves on the palm, Am: annual harvest leaving two leaves, Ah: annual harvest leaving one leaf, Sl: two harvests per year leaving three leaves, Sm: two harvests per year leaving two leaves. Treatments Ah and Sm simulated the traditional harvest method, and the remaining treatments simulated higher or lower harvest intensities and frequencies. Leaf production was higher in individual palms under higher harvest intensities and frequencies (Ah, Sl and Sm), but palm growth and leaf size were not affected by harvest. Number of inflorescences per palm differed between treatments and between homegardens during the first year only, but we could not find a clear pattern of variation. Production of new leaves was affected by initial palm size and initial leaf number. Removing mature leaves while leaving the young ones, as well as the intensity and frequency, with which traditional harvest is practiced, stimulate palms to compensate the defoliation effects by producing new leaves. This practice is based on empirical Maya knowledge that enables the manipulation of micro-environmental conditions and the development of sustainable harvesting strategies for the xa’an palm in traditional agro-forestry systems. 相似文献
69.
Efficacy of an alphabaculovirus‐based biological insecticide for control of Chrysodeixis chalcites (Lepidoptera: Noctuidae) on tomato and banana crops
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70.
The multiply-enveloped nucleopolyhedrovirus (SeMNPV) of Spodoptera exigua (Hübner) is being employed on an increasing scale as the basis for bioinsecticidal products for control of this pest in greenhouse
crops in Europe. The mortality of diet-reared S. exigua larvae was determined after feeding on lettuce leaf discs contaminated by mixtures of SeMNPV occlusion bodies and 1 of 13
substances reported to have phagostimulant properties. Of the substances tested, wheatgerm and soya flour resulted in significantly
increased mortality compared to the virus alone. However, these preferences disappeared when larvae were reared on lettuce.
We conclude that (1) the activity of potential phagostimulant substances depends on the prior feeding experience of S. exigua and, (2) laboratory tests using diet-reared insects require validation using plant-reared larvae before being developed for
field testing. 相似文献