Overwintering
Mostrando 25-36 de 41 artigos, teses e dissertações.
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25. Population Changes and Persistence of Rhizobium phaseoli in Soil and Rhizospheres †
The impact of legume cultivation on the establishment and persistence of an inoculant strain of Rhizobium phaseoli and its ability to compete with a resident population of R. phaseoli for nodule occupancy was examined utilizing strain-specific fluorescent antibodies. The soil (Hubbard loamy sand) was inoculated homogeneously with 5 × 105 cells per g of soil
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26. Refractoriness to melatonin occurs independently at multiple brain sites in Siberian hamsters
The mid-winter development of refractoriness to melatonin (Mel) triggers recrudescence of the atrophied reproductive apparatus of rodents. As a consequence, over-wintering animals become reproductively competent just before the onset of spring conditions favorable for breeding. The neural target tissues that cease to respond to winter Mel signals have n
The National Academy of Sciences.
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27. Juvenile hormone regulation of longevity in the migratory monarch butterfly.
Monarch butterflies (Danaus plexippus) of eastern North America are well known for their long-range migration to overwintering roosts in south-central Mexico. An essential feature of this migration involves the exceptional longevity of the migrant adults; individuals persist from August/September to March while their summer counterparts are likely to live le
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28. Differential Cold Tolerance, Starch, Sugar, Protein, and Lipid of Yellow and Purple Nutsedge Tubers 1
From measurements of viability after exposure of tubers to natural overwintering in the soil and 6 weeks exposure at 2 C, species cold tolerance of the tubers was ranked in decreasing order: yellow nutsedge `I' (Cyperus esculentus L.), an ecotype originating in Illinois; yellow nutsedge `G', an ecotype originating in Georgia; and purple nutsedge (Cyperus rot
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29. Reactivation of Rickettsia rickettsii in Dermacentor andersoni ticks: an ultrastructural analysis.
Virulent Rickettsia in Dermacentor andersoni lose their pathogenicity and virulence for guinea pigs when subjected to physiological stresses, such as starvation (overwintering), of its tick vector. However, incubation of infected ticks at an elevated temperature (37 degrees C) for 24 to 48 h or feeding for a time (usually greater than 10 h) induces R. ricket
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30. Supercool or dehydrate? An experimental analysis of overwintering strategies in small permeable arctic invertebrates
Soil invertebrate survival in freezing temperatures has generally been considered in the light of the physiological adaptations seen in surface living insects. These adaptations, notably the ability to supercool, have evolved in concert with surface invertebrates' ability to retain body water in a dry environment. However, most soil invertebrates are orders
National Academy of Sciences.
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31. Independent Activation of Cold Acclimation by Low Temperature and Short Photoperiod in Hybrid Aspen1
Temperate zone woody plants cold acclimate in response to both short daylength (SD) and low temperature (LT). We were able to show that these two environmental cues induce cold acclimation independently by comparing the wild type (WT) and the transgenic hybrid aspen (Populus tremula × Populus tremuloides Michx.) line 22 overexpressing the oat (Avena sativa)
American Society of Plant Physiologists.
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32. Ecology of Vibrio parahaemolyticus in Chesapeake Bay
A study of the ecology of Vibrio parahaemolyticus and related vibrios in the Rhode River area of Chesapeake Bay was carried out over the period December 1970 through August 1971. The incidence of V. parahaemolyticus and related vibrios was found to be correlated with water temperature. The vibrios could not be detected in the water column during the winter m
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33. Thermal acclimation and stress in the American lobster, Homarus americanus: equivalent temperature shifts elicit unique gene expression patterns for molecular chaperones and polyubiquitin
Using homologous molecular probes, we examined the influence of equivalent temperature shifts on the in vivo expression of genes coding for a constitutive heat shock protein (Hsc70), heat shock proteins (Hsps) (Hsp70 and Hsp90), and polyubiquitin, after acclimation in the American lobster, Homarus americanus. We acclimated sibling, intermolt, juvenile male l
Cell Stress Society International.
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34. Ecology of Vibrio vulnificus in Estuarine Waters of Eastern North Carolina
While several studies on the ecology of Vibrio vulnificus in Gulf Coast environments have been reported, there is little information on the distribution of this pathogen in East Coast waters. Thus, we conducted a multiyear study on the ecology of V. vulnificus in estuarine waters of the eastern United States, employing extensive multiple regression analyses
American Society for Microbiology.
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35. Topical Application of Ice-Nucleating-Active Bacteria Decreases Insect Cold Tolerance †
The majority of overwintering insects avoid lethal freezing by lowering the temperature at which ice spontaneously nucleates within their body fluids. We examined the effect of ice-nucleating-active bacteria on the cold-hardiness of the lady beetle, Hippodamia convergens, a freeze-intolerant species that overwinters by supercooling to ca. −16°C. Topical a
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36. Analysis of LaCrosse virus S mRNA 5' termini in infected mosquito cells and Aedes triseriatus mosquitoes.
Nucleotide sequences were determined for the 5' termini of La Crosse virus (LAC) S segment mRNA from persistently infected mosquito cell cultures (C6/36 from Aedes albopictus) and embryos (Aedes triseriatus). LAC primes transcription of its mRNA with "scavenged" 5' caps and adjacent oligonucleotides from host mRNAs, and these non-virus-encoded 5'-terminal ex