Two phantoms were constructed and imaged for the purpose of reproducing and understanding the relatively increased signal intensity of intervertebral disks on T1-weighted MR images in three patients with diffuse vertebral metastases. The first phantom simulated a normal spine and showed that the disks and vertebral bodies were of similar intensity. The second phantom simulated an abnormal spine...

The effect of temperature on the respiration rate of potato tuber slices has been analyzed in terms of the Arrhenius equation. Freshly cut disks, irrespective of thickness, show a linear response to increasing temperature up to 30 degrees with an activation energy (E) of approximately 12.0 Kcal. Aged disks less than 1.0 mm thick also give a linear response with E similar to that of fresh disks....

We present Submillimeter Array observations of the 880μm continuum emission from three circumstellar disks around young stars in Orion that lie several arcminutes (& 1-pc) north of the Trapezium cluster. Two of the three disks are in the binary system 253-1536. Silhouette disks 216-0939 and 253-1536a are found to be more massive than any previously observed Orion disks, with dust masses derived...

PURPOSE To measure the rate of enhancement in immature intervertebral disks in comparison with that of mature disks after intravenous administration of gadolinium-containing contrast media. METHODS Four rabbits were imaged with MR for 120 minutes after the injection of gadopentetate dimeglumine, gadoteridol, or gadodiamide. Contrast enhancement was measured in the lumbar intervertebral disks ...

ÐThe emergence of network-attached disks provides the possibility of transferring data between the storage system and the client directly. This offers new possibilities in building a distributed storage system. In this paper, we examine different storage organizations based on network-attached disks and compare the performance of these systems to a traditional system. Trace-driven simulations a...

Abstract In the present study solution and coordination chemistry of copper(II)–alkyl- N -iminodiacetate systems are studied in aqueous by potentiometry, using ion selective copper pH electrodes, EXAFS (extended X-ray absorption fine structure) dye probe molecular spectrophotometry. Alkyl- -iminodiacetates with varying alkyl chain length, methyl (CH 3 –), n -hexyl (C 6 H 13 -dodecyl 12 25 –) -o...

In serum, the primary indicator of vitamin D nutritional status is 25-hydroxyvitamin D [25(OH)D], whereas 1,25dihydroxyvitamin D [l,25(OH)2D1 reflects mineral and skeletal homeostasis. Essential for a reliable assay of 1,25(OH)2D in serum is its separation from 25(OH)D, because the latter circulates in a 1000-fold greater concentration and significantly cross-reacts with the receptors used in r...

The cytotoxic response of several types of neoplastic cells to analogues of unnatural alkyl phospholipids (e.g., roc-l-hexadecyl-2-methoxy-glycero-3-phosphocholine) has been partially attributed to their accumulation as a result of the low activity of the alkyl cleavage enzyme (a tetrahydropteridine-dependent monooxygenase) in tumor cells. We tested this possibility by comparing the alkyl cleav...

II. Protoplanetary Disks 7 A. The star formation context 7 B. Passive circumstellar disks 8 1. Vertical structure 9 2. Radial temperature profile 9 3. Spectral energy distribution (SED) 10 4. Sketch of more complete models 11 C. Actively accreting disks 11 1. Diffusive evolution equation 12 2. Solutions 12 3. Temperature profile 14 4. Origin of angular momentum transport 15 5. Layered disks 17 ...