Terminology Service < Semantic Lookup Platform

All terms in ONE

Label	Id	Description
similarity calculation	OBI_0200113	[A similarity calculation is a data transformation that attaches to each pair of objects in the input a number that is meant to reflect how 'close' or 'similar' those objects are.]
classified data set	OBI_0000023	[A data set that is produced as the output of a class prediction data transformation and consists of a data set with assigned class labels.]
loess fitting	OBI_0200116	[A loess fitting is a curve fitting obtained by localized regression. The latter refers to fitting a polynomial (straight line, quadratic, cubic, etc) to data values within a window covering a fraction of the total number of observations. As the window slides along the axis, a new polynomial is fit to the observations falling within the window. This continues until all points are fit with a local polynomial. The results are then smoothed together to form a curve. The smoothness of loess fits is controlled by a smoothing parameter (often denoted as alpha, usually between 1/4 and 1) and the degree of the polynomial that is fitted by the method (usually denoted by lambda).]
curve fitting objective	OBI_0200174	[A curve fitting objective is a data transformation objective in which the aim is to find a curve which matches a series of data points and possibly other constraints.]
pearson correlation coefficient calculation	OBI_0200115	[A pearson correlation coefficient calculation is a similarity calculation which attaches to each pair of random variables X and Y the ratio of their covariance by the product of their standard deviations. Given a series of n measurements of X and Y written as x_i and y_i where i = 1, 2, ..., n, then their Pearson correlation coefficient refers to the "sample correlation coefficient" and is written as the sum over i of the ratios (x_i-xbar)(y_i-ybar)/((n-1)s_x*s_y) where xbar and ybar are the sample means of X and Y , s_x and s_y are the sample standard deviations of X and Y. The closer the pearson correlation coefficient is to 1, the more similar the inputs are considered.]
quantile calculation	OBI_0200118	[A quantile calculation is a descriptive statistics calculation in which the kth quantile is the data value for which an approximate k fraction of the data is less than or equal to that value. See http://www.stat.wvu.edu/SRS/Modules/Quantiles/quantiles.html for details.]
mode calculation	OBI_0200117	[A mode calculation is a descriptive statistics calculation in which the mode is calculated which is the most common value in a data set. It is most often used as a measure of center for discrete data.]
dermis	UBERON_0002067	[The dermis is a layer of skin between the epidermis (with which it makes up the skin) and subcutaneous tissues, and is composed of two layers, the papillary and reticular dermis[WP].]
histone modification	GO_0016570	[The covalent alteration of one or more amino acid residues within a histone protein.]
median calculation	OBI_0200119	[A median calculation is a descriptive statistics calculation in which the midpoint of the data set (the 0.5 quantile) is calculated. First, the observations are sorted in increasing order. For an odd number of observations, the median is the middle value of the sorted data. For an even number of observations, the median is the average of the two middle values.]
NMR sample holder	OBI_0000484	[An NMR sample holder is the part of an NMR instrument, which carries the NMR probe,sample tube and the nmr sample.]
APOLLO console	OBI_0000483	[The APOLLO is a compact, modular, multiple-DSP, Windows XP Professional-based console that can be equipped with up to 8 DDS-based RF transmitter channels configurable from 2 kHz to 3.5 GHz. Each transmitter channel produces a nominal 1V output and has the most agile frequency, phase and amplitude control of any system on the market. An array of additional options are available including multiple RF transmitters, linear high-power RF amplifiers, digital receiver arrays, low noise figure preamplifiers, a gradient control system, shim unit, MAS spin-speed controller, variable temperature unit, digital lock system and probe/coil interface. With its numerous options, the Apollo can be configured for any NMR, NQR or MRI application.]
tecmag NMR console	OBI_0000599	[An NMR console manufactured by tecmac.]
normal phase column	OBI_0000482	[A normal phase column is a chromatography column in which the stationary phase is more polar than the mobile phase. Its counterpart is the reversed phase column.]
chromatography detector	OBI_0000481	[A chromatography detector is a device that locates in the dimensions of space and time, the positions of the components of a mixture that has been subjected to a chromatographic process and thus permits the senses to appreciate the nature of the separation. Defining characteristics are Dynamic Range, Response Index or Linearity, Linear Dynamic range, Detector Response, Detector Noise Level, Detector Sensitivity or Minimum Detectable Concentration, Total System Dispersion, Sensor Dimensions, Detector Time Constant, Pressure Sensitivity, Flow Sensitivity, Operating Temperature Range.]
Bruker high resolution probe	OBI_0000480	[BRUKER BIOSPIN's experienced Research & Development group not only delivers top-performance probes for the more common experiments, but also a wealth of special probes for almost any application. For high resolution (HR) NMR we offer probes with a variety of important characteristics and features.]
Bruker NMR probe	OBI_0000561	[An NMR probe that is manufactured by Bruker.]
nitrogen phosphorous detector	OBI_0000489	[The nitrogen phosphorus detector (NPD) (sometimes called the thermionic detector) is a very sensitive, specific detector the design of which, is based on the FID. Physically the sensor appears to be very similar to the FID but, in fact, operates on an entirely different principle. The nitrogen phosphorous detector (sometimes called the thermionic detector) is a very sensitive but specific detector that responds almost exclusively to nitrogen and phosphorous compounds. It is based on the flame ionization detector but differs in that it contains a rubidium or cesium silicate (glass) bead situated in a heater coil, a little distance from the hydrogen flame. If the detector is to respond to both nitrogen and phosphorous then the hydrogen flow should be minimal so that the gas does not ignite at the jet. If the detector is to respond to phosphorous only, a large flow of hydrogen is used which is burnt at the jet. The heated bead emits electrons by thermionic emission. These electrons are collected under a potential of a few volts by an appropriately placed anode, and provides a background current. When a solute containing nitrogen or phosphorous is eluted from the column, the partially combusted nitrogen and phosphorous materials are adsorbed on the surface of the bead. The adsorbed material reduces the work function of the surface and, as consequence, the emission of electrons is increased which raises the current collected at the electrode. The sensitivity of the detector to phosphorous is about 10-12 gram per ml and for nitrogen about 10-11 gram per ml at a signal to nose ratio of 2. The alkali bead as a finite life and needs regular replacement.]
fourier transformation NMR instrument	OBI_0000487	[In fourier transformation NMR, all frequencies in a spectrum are irradiated simultaneously with a radio frequency pulse. Following the pulse, the nuclei return to thermal equilibrium. A time domain emission signal is recorded by the instrument as the nuclei relax. A frequency domain spectrum is obtained by Fourier transformation.]
NMR instrument	OBI_0000566	[An Instrument which is used to carry out a NMR analysis of some sample.]