aggregate

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aggregate

1. (of fruits and flowers) composed of a dense cluster of carpels or florets
2. Geology a rock, such as granite, consisting of a mixture of minerals
3. a group of closely related biotypes produced by apomixis, such as brambles, which are the Rubus fruticosus aggregate

Aggregate

Any of a variety of materials, such as sand and gravel, added to a cement mixture to make concrete.

aggregate

any collection of units or parts, however temporary or fortuitous; thus the contrast may sometimes be drawn between mere aggregates, with no internal structure or basis for persistence, and GROUPS, COMMUNITIES, etc, which will usually possess clear internal structure, coherence, cohesion and relative persistence.

Aggregate

 

in mineralogy and petrography, an accumulation and accretion of fragments of one or several minerals of varying shapes and structures. Aggregates are classified as cemented, friable, earthy, porous, or dense. According to the shape of the grain, they are called grainy, crystalline, needle-shaped, cubic, fibrous, tangled fibrous, radial, uniform crystalline, shell-shaped, accumulative, and so on; and according to composition, simple—consisting of a single mineral (for example, quartzite, which consists of quartz, and marble, which consists of calcite)—and complex, consisting of several minerals (for example, granite is an aggregate of quartz, feldspar, and mica).

V. P. PETROV

aggregate

[′ag·rə·gət]
(botany)
Referring to fruit formed in a cluster, from a single flower, such as raspberry, or from several flowers, such as pineapple.
(chemistry)
A group of atoms or molecules that are held together in any way, for example, a micelle.
(geology)
A collection of soil grains or particles gathered into a mass.
(materials)
The natural sands, gravels, and crushed stone used for mixing with cementing material in making mortars and concretes.

aggregate

1. An inert granular material such as natural sand, manufactured sand, gravel, crushed gravel, crushed stone, vermiculite, perlite, and air-cooled blast-furnace slag, which when bound together into a conglomerate mass by a matrix forms concrete or mortar.
2. An inert granular material that may be added to gypsum plaster.

aggregate

General term for the mineral fragments or particles which, through the agency of a suitable binder, can be combined in a solid mass, e.g., to form a pavement (ICAO).

aggregate

To gather, collect or assemble. For example, "to aggregate data" means to gather separate sets of data. As a noun, "aggregate data" is data that has been collected from two or more sources. See content aggregator.
References in periodicals archive ?
10 In our study we aimed to investigate the effect of varying concentrations of recombinant human leptin hormone on platelet aggregation in PD patients.
Exclusion criteria: Patients with diabetes, platelet adhesion defects such as von Willebrand disease, Bernard-Soulier syndrome or platelet aggregation defects such as Glanzmann's thrombasthenia, afibrinogenemia; history of an infectious disease in the last 10 days and use of at least one of following drugs in the last two weeks: acetylsalicylic acid, clopidogrel, ticlopidine, beta lactam antibiotics, corticosteroids and non-steroidal anti-inflammatory drugs.
c) Area under the curve (AUC): Best marker of platelet aggregation, expressed as AU x minute Study design: Four test cells for each patient were prepared and process was carried aout for each cell in a sequential manner.
Test cell (C1): Only 300 uL hirudinated blood, 300 uL normal saline and 31uL (10 umole/L) ADP was put into C1 and platelet aggregation measurement was made.
Spearman correlation test was used to analyze the relation between platelet aggregation measurements of C1 and patients' serum leptin levels and body mass indices (BMI).
There are numerous types of data aggregation schemes [15][16]: centralized, tree-based, static-cluster-based, and dynamic-cluster-based.
Basically, there are two types of data aggregation that make these decisions: the data counting method and the time waiting method.
In this paper, we suggest an optimal aggregation finding scheme, which considers not only the communication and delay cost, but also the ratio of generated sensing data.
Based on these metrics, we can derive the cost function, which can provide the optimal aggregation point.
The total cost is linearly increased as the wait time increases, because there is no aggregation.
In the new study, Nukina and his colleagues screened more than 200 compounds for their capacity to inhibit aggregation of proteins containing extra glutamines.
He notes that the work starts at a basic level--a hunt for compounds that bind to glutamine-loaded proteins--then tests whether the selected substance thwarts the aggregation of proteins in cells.