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High-resolution measurements of the kinetic energies of hydrogen atom fragments formed during ultraviolet photolysis of imidazole, pyrrole, and phenol in the gas phase confirm that N(O)-H bond fission is an important nonradiative decay process from their respective 1pisigma* excited states. The measurements also reveal that the respective cofragments (imidazolyl, pyrrolyl, and phenoxyl) are formed in very limited subsets of their available vibrational states. Identification of these product states yields uniquely detailed insights into the vibronic couplings involved in the photoinduced evolution from parent molecule to ultimate fragments. 相似文献
13.
Although the landscape matrix is increasingly incorporated into spatial-ecological population studies, little consideration
has been given to the likely possibility that patch quality is confounded with the composition of the matrix surrounding each
patch. For example, the nutritional quality of host-plant patches to an herbivore may be highly correlated with matrix composition,
consequently obfuscating the importance of the matrix itself to interpatch dispersal. From a literature survey of the effects
of the matrix on herbivore movement among host-plant patches, we found that 55% of the studies (6/11) failed to experimentally
or statistically isolate the effects of the matrix from potential patch-quality effects on dispersal. Most studies consisted
of mark-recapture experiments in natural landscapes where patch equality was not controlled or manipulated. Of the few studies
that evaluated the relationship between matrix composition and patch quality, all of them (3/3) found that these two landscape
factors covaried. These data suggest that in most matrix studies, effects of the matrix on dispersal may be wholly, or in
part, due to underlying differences in patch quality.
This revised version was published online in May 2005 with corrections to the Cover Date.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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Amino acids have been found in aqueous extracts of a C2 carbonaceous chondrite recovered from Antarctica. The composition of the amino acids strongly suggests that they have a meteoritic origin. Comparison of these results with those obtained with other C2 chondrites supports the view that Antarctic meteorites have not been significantly altered by terrestrial processes since their fall. 相似文献
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Barber LG Sørenmo KU Cronin KL Shofer FS 《Journal of the American Animal Hospital Association》2000,36(5):416-421
A retrospective evaluation was performed on 12 cats with nonresectable, histopathologically confirmed fibrosarcomas that were treated with doxorubicin and cyclophosphamide chemotherapy. All of the tumors were located in sites potentially used for vaccination. Six cats had a greater than 50% decrease in gross tumor burden. However, the responses were not durable, with a median response duration of 125 days. All cats developed progressive disease. When animals that received other treatments after doxorubicin-based chemotherapy were eliminated from the analysis, median survival time was significantly longer for cats that responded to chemotherapy compared with the median survival time for nonresponders (242 and 83 days, respectively). These findings may serve as a basis for further evaluating the role of chemotherapy in the treatment of vaccine-associated sarcomas. 相似文献
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This report describes a novel technique for abdominal wall reconstruction using an internal abdominal oblique muscle flap in an Australian kelpie. En bloc resection of a chondrosarcoma and biopsy scar centred on the 13th rib was performed to include full thickness thoracic wall (12th rib, extending caudally) and lateral abdominal wall (including the vascular pedicle of the external abdominal oblique muscle). The diaphragm was advanced to close the thorax. A flap using the caudal internal abdominal oblique muscle with the base dorsally was elevated and rotated 90° to fill the dorsal defect. The ventral defect was closed using the composite ventral abdominal muscles. The skin was closed primarily. The dog developed a self-resolving seroma. Twelve months postoperatively, the dog was able to engage in agility competitions. A viable muscle flap using the internal abdominal oblique muscle provides a useful alternative to previously described techniques for autogenous closure of a large abdominal wall wound. 相似文献