. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 100 200 Days Before Collection 300 400 Distance (mm). 200 400 Days Before Collection 600 800 Figure 4. Variation in Sr concentration across growth increments in the chondrophore ofAIya arenaria. Each of the three scans was taken on a different shell; all shells were harvested at the same time. Distance is measured in millimeters from the ventral margin of the chondrophore. Time before harvesting was calculated hy dividing the distance from the margin by the average growth rate per day, which was determined by measuring the d
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 100 200 Days Before Collection 300 400 Distance (mm). 200 400 Days Before Collection 600 800 Figure 4. Variation in Sr concentration across growth increments in the chondrophore ofAIya arenaria. Each of the three scans was taken on a different shell; all shells were harvested at the same time. Distance is measured in millimeters from the ventral margin of the chondrophore. Time before harvesting was calculated hy dividing the distance from the margin by the average growth rate per day, which was determined by measuring the distance from the margin to the spawning break which occurred approximately 90 days before harvest. Each plot consists of three separate scans separated by up to 150 /jm parallel to the growth increments. Notice the strong correlation of variations in each of the separate scans. Note also the correlations between the shells. We believe that these variations represent changes in the water temperature over time. spectrometers detect only a single x-ray wavelength, they eliminate the filtering necessary to prevent saturation of an energy-dispersive detector by Ca x rays. This filtering also attenuates other low-energy x rays, preventing the detection of low-Z elements and resulting in high (200 ppm) MDLs for Ti. Use of a wavelength-dispersive detector would allow the detection of much smaller quan- tities of low-Z elements, and possibly improve MDLs for higher-Z elements as well. Such a device is now in use at the National Synchrotron Light Source at Brookhaven National Laboratory (Rivers et at., 1992). Future SXRF microprobes will become even more useful as they are developed at third-generation synchrotrons, such as the Advanced Photon Source (APS) at Argonne National Laboratory. A planned SXRF microprobe at the APS will have 104 times more photons in a given energy range. This will allow the use of extremely small spot sizes ( nm) at current detection limits, or lower detecti
Size: 3632px × 688px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
