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Cecilia Flores-Vergara Beatriz Cordero-Esquivel Ana Nallely Cerón-Ortiz & Bertha O Arredondo-Vega 《Aquaculture Research》2004,35(12):1131-1140
Temperature and quality of the available food are important factors that influence the physiology of oysters; however, the combined effects have not been well studied. We evaluated the impacts of the temperature and diet on the growth, survival and biochemical composition in the Pacific oyster Crassostrea gigas spat, cultured in the laboratory for 8 weeks at 23, 26, 29 and 32°C and fed Isochrysis sp.‐Pavlova lutheri (IP) and Dunaliella tertiolecta (Dt). The growth and biochemical composition showed a pattern, which changed in response to rising temperature. The shell length was significantly longer, in spat fed the IP diet, except at 32°C, where both diets produced poor growth results. The survival was <50% after 5 weeks at 32°C, whereas at all other temperatures it was >88%. High temperatures directly increased lipids and saturated fatty acids, while the proteins, carbohydrates and unsaturated fatty acids decreased. High temperatures achieved in the environment, as those reached on clear summer days during low tides, are an important stressor in oyster spat, especially when the quality of the available food is poor. 相似文献
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Damaris Godinez-Vidal Mario Rocha-Sosa Edgar B. Sepúlveda-García Joel Lara-Reyna Reyna Rojas-Martínez Emma Zavaleta-Mejía 《European journal of plant pathology / European Foundation for Plant Pathology》2008,120(3):299-303
We tested the hypothesis that PAL activity in chilli plants CM-334 inoculated with Nacobbus aberrans (Na) alone or in combination with Phytophthora capsici (Pc), is lower than in those inoculated only with Pc. At 21 days after nematode inoculation, inoculated plants showed a significant
(P < 0.01) reduction of 48% in PAL activity compared to those non-inoculated in two separate experiments. In two other tests,
where plants were inoculated with the oomycete 21 days after inoculation with the nematode, PAL activity at 2, 4, 6, 8 and
24 h after inoculation with Pc was significantly higher (Tukey, P < 0.01) in plants inoculated only with Pc than in plants inoculated only with Na or both pathogens (Na+Pc). 相似文献
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The aim of this study was to analyze two colorimetric methods used to determine easily extracted glomalin-related soil proteins (EE-GRSP). The historically and most commonly used method for measurement of EE-GRSP as total protein has been the Bradford assay. After some troubles/inconsistencies with this method, we carefully analyzed the Bradford assay, measuring a dilution series of the EE-GRSP fraction and analyzing the time stability of the product. In addition, we did similar analysis of another colorimetric method that quantifies total protein, the bicinchoninic acid (BCA) assay. Unexpectedly, we found that the EE-GRSP concentration values determined by Bradford assay were dependent and variable with the dilution level of the soil extract; moreover, the Bradford assay shows a great instability with the time when soil samples were analyzed but not when protein solution as bovine serum albumin (BSA) was used as control. On the contrary, the BCA assay was independent of the dilution levels of the soil extract and showed stability in the time either for soil samples or BSA protein quantification. These results were consistent and independent on the different type of soils corresponding to different locations and with different textures. 相似文献
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Nallely Estrada‐Perez Javier M. J. Ruiz‐Velazco Francisco J. Magallon‐Barajas Angel I. Campa‐Cordova Alfredo Hernndez‐Llamas 《Aquaculture Research》2020,51(1):242-254
The production of Litopenaeus vannamei was analysed when affected by the acute hepatopancreatic necrosis disease using a dynamic stock model and primary data of seven production cycles from a shrimp farm in Mexico from 2013 to 2016. Significant results (p < .05) of the correlation analysis indicated that during those years mortalities by the disease were more severe when water salinity was high and productivity was low. Significant results from ANOVA showed that throughout the period, disease severity and salinity diminished while pond productivity initially declined but subsequently improved. Significant results from regression analyses conducted for each production cycle also indicated the importance of salinity and productivity on disease severity and showed that early mortality by the disease occurred in ponds with warmer water. Within the observed range of water quality parameters, increases of 1 cm in water transparency and 1 g/L in salinity resulted in increments within 0.17%–0.25% and 1.7%–3.1% in shrimp mortality by the disease. When increases of 1°C in water temperature were recorded, outbreaks occurred 0.2–1.57 weeks earlier. In conclusion, the disease strongly determines the dynamics of shrimp production, and the role of salinity, productivity and temperature is worthy of further delving. 相似文献
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Jesús Jaime Guerra-Santos Rosa María Cerón-Bretón Julia Griselda Cerón-Bretón Diana Lizett Damián-Hernández Reyna Cristina Sánchez-Junco Emma del Carmen Guevara Carrió 《林业研究》2014,25(1):129-134
We report the results of carbon stored in soil and aboveground biomass from the most important area of mangroves in Mexico,with dominant vegetation of Red mangrove(Rhizophora mangle L.),Black mangrove(Avicennia germinans L.),white mangrove(Laguncularia racemosa Gaertn.)and button mangrove(Conocarpus erectus L.).We sampled soils with high fertility during the dry season in 2009 and 2010at three sites on Atasta Peninsula,Campeche.We used allometric equations to estimate above ground biomass(AGB)of trees.AGB was higher in C.erectus(253.18±32.17 t·ha-1),lower in A.germinans(161.93±12.63t·ha-1),and intermediate in R.mangle(181.70±16.58 t·ha-1)and L.racemosa(206.07±19.12 t·ha-1).Of the three studied sites,the highest absolute value for AGB was 279.72 t·ha-1in button mangrove forest at any single site.Carbon stored in soil at the three sites ranged from36.80±10.27 to 235.77±66.11 t·ha-1.The Tukey test(p0.05)made for AGB was higher for black mangrove showed significant differences in soil carbon content between black mangrove and button mangrove.C.erectus had higher AGB compared with the other species.A.germinans trees had lower AGB because they grew in hypersaline environments,which reduced their development.C.erectus grew on higher ground where soils were richer in nutrients.AGB tended to be low in areas near the sea and increased with distance from the coast.A.germinans usually grew on recently deposited sediments.We assumed that all sites have the same potential to store carbon in soil,and then we found that there were no significant differences in carbon content between the three samples sites:all sites had potential to store carbon for long periods.Carbon storage at the three sampling sites in the state of Campeche,Mexico,was higher than that reported for other locations. 相似文献
6.
José A. Núñez-Gastélum Dalia I. Sánchez-Machado Jaime López-Cervantes Jesús R. Rodríguez-Núñez Ma. A. Correa-Murrieta Reyna G. Sánchez-Duarte 《Journal Of Aquatic Food Product Technology》2013,22(3):334-343
ABSTRACTThis study focuses on the isolation and quantification of astaxanthin and its esters in the oils extracted from shrimp waste. The content of astaxanthin was determined by high performance liquid chromatography and ranged from 1.5 to 2.1 mg g?1. The astaxanthin and its esters were isolated by thin layer chromatography in three fractions: free astaxanthin, monoester, and diester of astaxanthin, with percentages of 44, 32, and 26%, respectively. Oleic acid was the major fatty acid in the monoester fraction, while palmitic, oleic, and stearic acids were present predominantly in the diester fraction. Free radical-scavenging activity of the oils and the three fractions was evaluated. All oils showed an effect on the decrease in the absorbtion of 1,1-diphenyl-2-picrylhydrazyl solutions, while among the fractions no significant difference occurred. Pigmented oil from shrimp waste is an organic source of pigment and antioxidant astaxanthin, the esters, and fatty acids, such as eicosapentaenoic and docosahexaenoic. 相似文献
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Nallely Gaxiola-Cuevas Saraid Mora-Rochín Edith Oliva Cuevas-Rodriguez Liliana León-López Cuauhtémoc Reyes-Moreno Alvaro Montoya-Rodríguez Jorge Milán-Carrillo 《Plant foods for human nutrition (Dordrecht, Netherlands)》2017,72(3):314-320
Phenolic acids profiles, chemical antioxidant activities (ABTS and ORAC), as well as cellular antioxidant activity (CAA) of tortilla of Mexican native maize landraces elaborated from nixtamalization and lime cooking extrusion processes were studied. Both cooking procedures decreased total phenolics, chemicals antioxidant activity when compared to raw grains. Extruded tortillas retained 79.6–83.5%, 74.1–77.6% and 79.8–80.5% of total phenolics, ABTS and ORAC values, respectively, compared to 47.8–49.8%, 41.3–42.3% and 43.7–44.4% assayed in traditional tortillas, respectively. Approximately 72.5–88.2% of ferulic acid in raw grains and their tortillas were in the bound form. Regarding of the CAA initially found in raw grains, the retained percentage for traditional and extruded tortillas ranged from 47.4 to 48.7% and 72.8 to 77.5%, respectively. These results suggest that Mexican maize landrace used in this study could be considered for the elaboration of nixtamalized and extruded food products with nutraceutical potential. 相似文献
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The invasive Argentine ant Linepithema humile was found in close perimeters to inhabited houses situated in various habitat types in Doñana National Park (Southern Spain). We suggest that the Argentine ant is found in these sites largely due to passive importation by man, but from there may have the potential to spread into surrounding favourable natural habitats. Ant species richness and diversity around houses was similar to that in natural habitats, except in the cases where the Argentine ant dominated, where a considerable lower ant species diversity and richness was observed. The species composition of ants in the immediate vicinity of houses was very different from that of the surrounding natural habitats, although the species composition between houses was very similar, regardless of the type of surrounding natural habitat. Ant species around houses were typically generalists, opportunists or open habitat specialists. Many of these species are considered dominant in that they are characterised by having large nests, aggressive behaviour and mass recruitment in response to attack. However, these species are displaced by the Argentine ant when introduced. Not all ant species show the same responses to invasions by the Argentine ant, and some species, such as Cardiocondyla batesii, Oxyopomyrmex saulcyi or Cataglyphis floricola, may be able to persist for a period following an invasion of the Argentine ant. These species are characterised by small nests and submissive behaviour, and may survive by avoiding conflict with the invasive species. 相似文献