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This paper examines distance‐based effects of the introduction of a National Basketball Association (NBA) team on establishment‐level sales. Using a unique micro dataset with precise geographic location information and industry detail, we apply spatio‐temporal estimation strategies following Harger et al. and Ahlfeldt and Kavetsos. We build on the literature by focusing on sales activity, a broad measure of economic activity, for industries related to the NBA‐product. Our application considers the relocation of the NBA’s Seattle franchise (Supersonics) to Oklahoma City (Thunder). The results reveal spatially differentiated impacts that would be obscured using data aggregated over space or industry. Specifically, food establishments exhibit increased sales and entertainment establishments exhibit decreased sales relative to establishments in the outer most ring of the study area. 相似文献
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Serum C'3 lytic system in patients with glomerulonephritis 总被引：23，自引：0，他引：23
R E Spitzer E H Vallota J Forristal E Sudora A Stitzel N C Davis C D West 《Science (New York, N.Y.)》1969,164(878):436-437
The serums of patients with hypocomplementemic glomerulonephritis contain a substance that combines with a normal serum cofactor in the presence of magnesium ion to specifically cleave the third component of complement. This lysis of C'3 is 80 to 90 percent complete in 20 minutes at 37 degrees C and pH 7. Neither the nephritic factor nor its cofactor is identifiable with the complement system. 相似文献
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Weingand KW Odioso LW Dameron GW Laytart MJ Stitzel KA 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》1992,21(1):10-14
A Baker 9000 hematology analyzer (electronic impedance) was purchased to replace an Ortho ELT-8/ds analyzer (laser optics) due to discontinued technical support. An analytical comparison of hemograms from healthy dogs, rats, and mice was made from paired disodium ethylenediamine tetra-acetate anticoagulated blood samples. Both instruments were calibrated with human blood products, and the ELT-8/ds hematocrit (HCT) was calibrated to a spun packed cell volume (PCV) for each species. For Beagle dogs (n = 49), Baker 9000 mean platelet (PCV) counts had a negative bias of -89 X 10(3)/microliter when compared to ELT-8/ds values. Mean +/- standard error manual PLT counts compared well with Baker 9OOO values for dogs (n = 10): 369 +/- 28 vs. 367 +/- 27 X 10(3)/microliter; r = 0.93. For CD-1 mice (n = 44), Baker 9000 mean white blood cell (WBC) counts had positive biases of 1. 1 X 10(3)/microliter when compared to ELT-8/ds and 0.5 X 10(3)/microliter when compared to hemacytometer counts. Diluted microsamples using the predilution mode on the Baker 9000 compared well with undiluted samples for mice. For Sprague-Dawley rats (n = 70), Baker 9000 mean WBC, red blood cell (RBC), and PLT counts had absolute biases of 0.8 X 10(3)/microliter, -1.09 X 10(6)/microliter, and -357 X 10(3)/microliter, respectively, when compared to ELT-8/ds values. Baker 9000 RBC, WBC, and PLT counts from rats compared well with reference hemacytometer counts. The Baker 9000 HCT determination for rats had an absolute negative bias of 6% when compared to the ELT-8/ds values or spun PCV. The Baker 9000 required whole blood calibration to PCV for accurate determination of HCT for rats. The biases between analyzers may be due to inherent physical differences between the analytical methods and/or the calibration techniques. 相似文献
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Oocytes, the female germ cells, contain all the messenger RNAs necessary to start a new life but typically wait until fertilization to begin development. The transition from oocyte to fertilized egg (zygote) involves many changes, including protein synthesis, protein and RNA degradation, and organelle remodeling. These changes occur concurrently with the meiotic divisions that produce the haploid maternal genome. Accumulating evidence indicates that the cell-cycle regulators that control the meiotic divisions also regulate the many changes that accompany the oocyte-to-zygote transition. We suggest that the meiotic machinery functions as an internal pacemaker that propels oocytes toward embryogenesis. 相似文献
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