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排序方式: 共有235条查询结果,搜索用时 31 毫秒
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2.
San-José Miriam Arroyo-Rodríguez Víctor Jordano Pedro Meave Jorge A. Martínez-Ramos Miguel 《Landscape Ecology》2019,34(5):1069-1080
Landscape Ecology - Landscape structure can affect seed dispersal, but the spatial scale at which such effect is maximized (scale of effect, SoE) is unknown. We assessed patterns and predictors of... 相似文献
3.
Effect of Stocking Density on Growth,Survival, and Condition of the Mexican Cichlid Cichlasoma beani
Edgar A. Aragon‐Flores Edna F. Valdez‐Hernandez Leonardo Martinez‐Cardenas Maria R. Castaeda‐Chavez Alfonso A. Gonzales‐Diaz Miriam Soria‐Barreto Javier M. J. Ruiz‐Velazco Emilio Pea‐Messina 《Journal of the World Aquaculture Society》2014,45(4):447-453
The Mexican cichlid Cichlasoma beani is currently exploited regionally as food and can be commercialized in the aquarium trade. Natural populations of C. beani may already be negatively affected by anthropogenic alteration of the areas in which it is distributed. The aim of the present study was to examine the effect on growth, survival, and condition of C. beani cultured in three stocking densities: three (D3), six (D6), and nine (D9) fish per each 40 L tank. At the end of a 6‐wk trial the fish cultured in D3 were longer, heavier, and grew faster than the rest of the treatments but their survival was the lowest compared to D6 and D9. The mortalities were caused by a strong aggressive behavior in D3. 相似文献
4.
Campos FR Januário AH Rosas LV Nascimento SK Pereira PS França SC Cordeiro MS Toldo MP Albuquerque S 《Fitoterapia》2005,76(1):26-29
Crude extracts and fractions of Bertholletia excelsa stem barks were tested for trypanocidal activity. Acetone and methanol extracts showed significant in vitro trypanocidal activity against trypomastigote form of Trypanosoma cruzi since in the concentration of 500 microg/ml, the parasites were reduced in 100% and 90.3% respectively, whereas the triterpene betulinic acid pure isolated from hexane extract presented 75.4%. 相似文献
5.
Ilana Kobiler Miriam Akerman Leah Huberman Dov Prusky 《Postharvest Biology and Technology》2011,59(2):166-171
In Israel, black spot caused by Alternaria alternata is the main postharvest factor that impairs the quality and reduces the storability of persimmon fruit (Diospyros kaki cv. Triumph). The fungus infects the fruit in the orchard and remains quiescent until harvest. After harvest, the pathogen slowly colonizes the fruit during storage at 0 °C, which elicits black spot symptom development 2–3 months after storage entry. A commercial postharvest dip treatment in chlorine at 500 mg L?1, released from sodium troclosene tablets, effectively controlled black spot in fruit stored for up to 2 months. However, decay incidence increased as the length of storage was extended beyond 2.5 months. The long incubation period that precedes black spot symptom development after harvest enabled the development of a series of integrative approaches for application at the pre- and postharvest stages, in combination with the commercial chlorine dip treatment, to improve the control of black spot disease. Preharvest treatments included treatment with the cytokinin-like N1-(2-chloro-4-pyridyl)-N3-phenylurea (CPPU) 30 d after fruit set, or a single spray with the curative fungicide polyoxin B 14 d before harvest, and when one of these was applied in combination with the postharvest chlorine dip treatment, the black spot infected area was reduced by 3 and 60%, respectively, compared with the chlorine dip alone. At the postharvest stage, fogging during storage, or post-storage on-line spraying with sodium troclosene, when applied in combination with the postharvest chlorine dip, improved the percentage of marketable fruit by 2 or 10%, respectively, compared with the chlorine dip alone. The results indicate that postharvest pathogens that show a slow colonization pattern might enable the integration of pre- and postharvest disease control methods to improve quality and reduce postharvest disease development. 相似文献
6.
Miriam Jontofsohn Gerd Pfister Gabriele Severin Karl-Werner Schramm Anton Hartmann Michael Schloter 《Journal of Soils and Sediments》2002,2(4):211-215
The impact of nonylphenol, an estrogenic degradation product of alkylphenol polyethoxylates, on the bacterial community structure
in contaminated sediments of aquatic microcosms was investigated over a period of 20 weeks using a 16S rDNA-based molecular
phylogenetic approach. All microcosms showeda strong seasonal fluctuation of the dominant as well as the active bacterial microflora independent of their degree of contamination
with nonylphenol. These changes were correlated with the dynamic of the total organic carbon content (TOC), ranging from 4–39
g/kg sediment dry weight and the redox potential in the sediment. Even at the highest observed nonylphenol concentration (3.4
mg/kg sediment dry weight) the bacterial community structure was mostly unchanged. 相似文献
7.
Poulsen KA Young JF Theil P Kolko M Oksbjerg N Lambert IH 《Journal of agricultural and food chemistry》2007,55(5):1970-1976
The role of phospholipase A2 in the induction of drip loss from pig muscle has been investigated. In samples from porcine M. longissimus dorsi, total PLA2 activity as well as mRNA and protein levels of the group VIA iPLA2 (iPLA2-VIA) increased during the initial 4 h post-mortem period. Morphological studies of porcine muscle showed that at 4 h post-mortem, gaps had formed between muscle fibers and that the sarcolemma membrane borders appeared blurred. At the same time iPLA2-VIA protein levels were increased inside muscle fibers and at the sarcolemma. iPLA2-VIA mRNA abundance in samples from different breeds of pigs with variations in drip loss revealed no clear correlation between drip loss level and iPLA2-VIA expression. Together, these data indicate that during the post-mortem period, iPLA2-VIA expression and activity is increased at the muscle fiber membranes. PLA2 activity may affect membrane permeability and consequently the progression of drip formation in porcine muscle. 相似文献
8.
Miriam Altstein Orna Ben-Aziz Irit Schefler Irina Zeltser Chaim Gilon 《Crop Protection》2000,19(8-10):547-555
The development of a new approach for the generation of a novel type of putative insect control agents based on backbone cyclic peptidomimetic antagonists of insect-neuropeptides is reported. The approach, termed the backbone cyclic neuropetide based on autogonist (BBC-NBA) was applied to the insect pyrokinin/pheromone biosynthesis activating neuropeptide (PBAN) family as a model, and led to the discovery of a potent linear lead antagonist and several highly potent, metabolically stable BBC peptidomimetic antagonists, devoid of agonistic activity, which inhibited in vivo PBAN-mediated activities in moths. 相似文献
9.
Sofia Vishnevetsky Miriam Cojocaru Yosef Steinberger 《Arid Land Research and Management》2013,27(1):59-68
The effect of environmental conditions, and especially soil water content, on microbial community structure was quantified during a 15-month sampling period (1994-1995) in a Negev Desert soil system by determination of phospholipid fatty acids (PLFAs). Two rainy seasons were observed during the study period: (1) the rainy season of 1993-1994, with a total rainfall of 58mm, and (2) the rainy season of 1994-1995, with a total of 140mm, which is 55% more than the multiannual average. Soil samples collected from the 0-10cm layer exhibited changes in soil moisture and PLFA composition. Palmitic acid (nC16:0) was found to be the most common acid, with a maximum abundance found in May 1994 (27.2%). Oleic acid (C18:1 omega 9) was found to be the second highest in abundance, with high levels in January 1994 (14%), decreasing gradually to 1.3% of total ion current in January 1995. This decrease was interpreted as being caused by abiotic factors affecting the microbial community, resulting in fatty acid profile and lipid abundance. Other acids were found to be present in relatively small amounts. The iC17:1 omega 9 and C18:2 omega 8, 11 were found among the major PLFAs during the study period. The data obtained in this study were found to be similar to data obtained in soils of temperate climates, in spite of the hypothesis that the total PLFAs of the desert soil microbes are triggered and depend on soil water availability. This can afford special data interpretation of the viable biomass of the soil microbes and their metabolic status. 相似文献
10.
Esposito JJ Sammons SA Frace AM Osborne JD Olsen-Rasmussen M Zhang M Govil D Damon IK Kline R Laker M Li Y Smith GL Meyer H Leduc JW Wohlhueter RM 《Science (New York, N.Y.)》2006,313(5788):807-812
Comparative genomics of 45 epidemiologically varied variola virus isolates from the past 30 years of the smallpox era indicate low sequence diversity, suggesting that there is probably little difference in the isolates' functional gene content. Phylogenetic clustering inferred three clades coincident with their geographical origin and case-fatality rate; the latter implicated putative proteins that mediate viral virulence differences. Analysis of the viral linear DNA genome suggests that its evolution involved direct descent and DNA end-region recombination events. Knowing the sequences will help understand the viral proteome and improve diagnostic test precision, therapeutics, and systems for their assessment. 相似文献