alpha

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alpha

1. the first letter in the Greek alphabet (Α, α), a vowel transliterated as a
2. Brit the highest grade or mark, as in an examination
3. 
a. involving or relating to helium-4 nuclei
b. relating to one of two or more allotropes or crystal structures of a solid
c. relating to one of two or more isomeric forms of a chemical compound, esp one in which a group is attached to the carbon atom to which the principal group is attached

alpha

(al -fă) (α)
1. The first letter of the Greek alphabet, used in stellar nomenclature usually to designate the brightest star in a constellation or sometimes to indicate a star's position in a group.
2. Symbol for right ascension.

alpha

[′al·fə]
(electronics)
The ratio between the change in collector current and the change in emitter current of a transistor.
(science and technology)
The first letter in the Greek alphabet: α, A.

ALPHA

(language)
(Or "Input") An extension of ALGOL 60 for the M-20 computer developed by A.P. Ershov at Novosibirsk in 1961. ALPHA includes matrix operations, slices, and complex arithmetic.

["The Alpha Automatic Programming System", A.P. Ershov ed., A-P 1971].

Alpha

(2)
1. <tool> A compiler generator written by Andreas Koschinsky <koschins@cs.tu-berlin.de> and described in his thesis at the Technische Universitaet Berlin. Alpha takes an attribute grammar and uses Bison and Flex to generate a parser, a scanner and an ASE evaluator (Jazayeri and Walter).

The documentation is in german.

Alpha

(1) See WolframAlpha.

(2) A family of RISC-based, 64-bit CPUs and computer systems from HP. Originally developed by Digital, which was acquired by Compaq and then HP, the first model introduced in early 1992 was the 150 MHz 21064-AA, considered equivalent to a Cray-1 on a single chip. Subsequent Alpha models continued to blaze the trails for high-speed microprocessors. Alpha-based servers (AlphaServers) run under Tru64 Unix and OpenVMS. In the mid-1990s, Windows NT was ported to the Alpha platform, but support was later dropped.

Alpha Went to Intel
In 2001, Compaq sold all Alpha intellectual property to Intel and announced it would switch its high-end servers to Intel's Itanium processors by 2004. HP acquired Compaq in 2002 and introduced enhanced AlphaServers. Orders were accepted for the new machines until April 2007, and support and service were promised until 2012.


Alpha Models
Shown here are a number of Alpha servers from low to high end. The Alpha chips are always pushing the envelope in performance and architecture. (Image courtesy of Compaq Computer Corporation.)
References in periodicals archive ?
Nishidate et al., "Prognostic roles of preoperative a-fetoprotein and des-y-carboxy prothrombin in hepatocellular carcinoma patients," World Journal of Gastroenterology, vol.
Medians for second trimester maternal serum a-fetoprotein, human chorionic gonadotrophin, and unconjugated estriol; differences between races or ethnic groups.
Notably, six variables in the clinical features dimension were significant predictors in all three survival models constructed by ANN: comorbidity, liver cirrhosis, a-Fetoprotein, platelet, ASA classification, and TNM stage.
Ribas et al., "Fine specificity analysis of an HLA-A2.1-restricted immunodominant T cell epitope derived from human a-fetoprotein," Molecular Immunology, vol.
Variables used to calculate the propensity match score included age, hepatitis B surface antigen (HBsAg), hepatitis B e antigen (HBeAg), cirrhosis, a-fetoprotein, total bilirubin, partial thromboplastin time, alkaline phosphatase, a-glutamyltransferase, differentiation, tumor size, vascular invasion, encapsulation, and tumor number.
[5] Nonstandard abbreviations: HCC, hepatocellular carcinoma; AFP, a-fetoprotein; CT, computed tomography; MRI, magnetic resonance imaging; GnT, N-acetylglucosaminyltransferase; DSA-FACE, DNA sequencer-assisted fluorophore-assisted carbohydrate electrophoresis; HBV, hepatitis B virus; Hpx, hemopexin; HA, heme agarose; NA3Fcb, core-[alpha]-1,6-branching-[alpha]-1,3-fucosylated triantennary glycan; NA4Fb, branching-[alpha]-1,3-fucosylated tetra-antennary glycan; NA2, bigalacto biantennary glycan; CRP, C-reactive protein; MELD, Model for End-Stage Liver Disease; HCV, hepatitis C virus.
Serum a-fetoprotein was more than 2,000 ng/mL in nearly half of the hepatitis B patients and in 5 of 35 hepatitis C patients.
Diagnosis is based on morphologic resemblance to hepatocellular carcinoma and positive immunostaining for a-fetoprotein. The tumor cells are large and polygonal with abundant granular eosinophilic cytoplasm and vesicular nuclei with prominent nucleoli.
Plasma analyses for albumin, total bilirubin, alkaline phosphatase, alanine aminotransferase (ALT), and a-fetoprotein were performed by the Chemical Pathology laboratory of the Prince of Wales Hospital, Hong Kong, with a DPE Modular Analytics system (Roche Diagnostics).
Although primary histologic diagnosis of HCC was not established, the rapidly rising level of a-fetoprotein to 2876 ng/mL is consistent with a clinical diagnosis of HCC.
Shifting to flow cytometry, our group developed an assay for a-fetoprotein in which the interference testing was performed simultaneously for all samples (11).
Treatment of serum at room temperature with PEG at a final concentration of 125 g/L precipitated IgM and IgG and 70% of IgA over a wide range of their serum concentrations without any adverse effect on the sensitivity, imprecision, or accuracy of the tested follicle-stimulating hormone, prolactin, and a-fetoprotein immunoassays (18), nor was there appreciable coprecipitation of many other tested analytes, such as thyroxine, testosterone, estradiol, and cortisol, but 35-40% of luteinizing hormone and thyroid-stimulating hormone was lost (19).