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The “storm-time” component of variation of the terrestrial magnetic field, that is, the component which correlates with the interval of time since the onset of a magnetic storm; used as an index of intensity of the ring current.


Daylight-Saving Time.


(1) (DeSTination) Contrast with SRC, which is an abbreviation of "source."

(2) (Digital Signal Trust Company, Salt Lake City, UT, www.digsigtrust.com) An organization that sets up and manages PKI systems for companies and industry groups. Using third-party software, it serves as a certification authority (CA), manages the repository and provides a secure location for the private keys. Founded in 1996, Utah-based DST was the first licensed CA in the U.S. and the first PKI service organization. Utah was the first state in the U.S. to pass digital signature legislation.

In 2002, DST was acquired by Identrus LLC (www.identrus.com), a global leader in digital trust services and secure e-commerce. See PKI.

(3) (Data Storage Technology) A high-capacity magnetic tape technology from Ampex that is based on the digital composite D2 format for the broadcasting industry. It uses the same 19mm, helical scan transport, but provides higher capacities with Ampex's proprietary Data D-2 (DD2) format. DST cartridges range from 50 to 330GB and are suited for uncompressed digital video (movies, commercials, etc.) and high-resolution images as well as general data backup for huge databases. Ampex's Data Instrumentation Systems (DIS) tape technology is a counterpart line that provides optional modes and interfaces for data acquisition devices. See magnetic tape.

DST Tape Storage
DST is not exactly for home computer use. The large 330GB tape cassette, which is as big as a laptop computer, could back up the entire neighborhood. The 4mm DAT cassette is shown for size comparison.
References in periodicals archive ?
In patients with renal failure, the recommended screening test is the 1-mg dexamethasone suppression test.
Relationship of nonalcoholic hepatic steatosis to overnight low-dose dexamethasone suppression test in obese individuals.
Discrepancies in results of low-and high-dose dexamethasone suppression tests for diagnosing preclinical Cushing's syndrome.
The establishment of the differential diagnosis of CS requires assessment of plasma cortisol, ACTH and one or more dynamic tests such as dexamethasone suppression test (DST) (4).
For Cushing's syndrome, administer the overnight dexamethasone suppression test.
Rates of nonsuppression on the dexamethasone suppression test are substantially higher in this condition than in other kinds of depression, including the melancholic subtype.
Low-dose dexamethasone suppression test (DST), 24-h urinary free cortisol (UFC) levels, highdose DST, corticotropin-releasing hormone (CRH) test and imaging modalities are among the current diagnostic approaches (4).
Patients with a clinically inapparent adrenal mass should have an overnight 1-mg dexamethasone suppression test (to evaluate for subclinical Cushing's syndrome) and plasma or urinary free metanephrines (more sensitive and specific for pheochromocytoma than 24-hour urine catecholamines).