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Topic: Z-Factor

    Note: these results are not from the primary (high quality) database.

Normalisation of the 96/97 and 99/00 F2 measurements The pull distribution width is close to 1 as expected, but there is a small relative normalisation difference between the measurements. A normalisation shift of 2.35% was found to produce the best agreement between the measurements. Normalisation of the 96/97 and 99/00 F2 measurements www.pp.rhul.ac.uk /~goncalo/scratch/ZEUS/ZEUS_ONLY/nc-normalisation/nc-norm.html

Efficiency factor - Wikipedia, the free encyclopedia Efficiency factor: In data communications, the ratio of (a) the time to transmit a text automatically at a specified modulation rate to (b) the time actually required to receive the same text at a specified maximum error rate. Telegraph communications may have different temporal efficiency factors for the two directions of transmission. All of the communication facilities are assumed to be in the normal condition of adjustment and operation. en.wikipedia.org /wiki/Efficiency_factor   (109 words)

Affymetrix Normalisation One can do this by merely finding a normalisation factor. The derivation of this factor is quite simple, and involves some simplistic algebra: The idea of this proxcedure is to make the average intensity of the experimental array numerically equivalent to the average intensity of the baseline array. www.ucl.ac.uk /oncology/MicroCore/HTML_resource/Norm_Affy2.htm   (109 words)

Growth factor - Wikipedia, the free encyclopedia Growth factor is a protein that acts as a signaling molecule between cells (like cytokines and hormones) that attaches to specific receptors on the surface of a target cell and promotes differentiation and maturation of these cells. The term growth factor is sometimes used interchangeably among scientitsts with the term cytokine. Growth factor signifies a positive effect on cell growth and cellular differentiation, but cytokine is a neutral term in regards to what it is being signalled. en.wikipedia.org /wiki/Growth_factor   (618 words)

Transcription Factor Transcription factors are primarily involved in the initiation stage of RNA transcription. Examples of transcription factors include Signal Transducers and Activator of Transcription (STAT), which regulate cell growth and are critical in cancer research and immunotherapy. A transcription factor is a protein that binds DNA at specific sites where it can regulate transcription. www.iscid.org /encyclopedia/Transcription_Factor   (199 words)

Risk factor - Wikipedia, the free encyclopedia Risk factors are evaluated by comparing the risk of those exposed to the potential risk factor to those not exposed. The term "risk factor" was first coined by heart researcher Dr. Thomas R. Dawber in a landmark scientific paper in 1961, where he attributed specific conditions (blood pressure, cholesterol, smoking) to heart disease. Statistical methods would be used in a less clear cut case to decide what level of risk the risk factor would have to present to be able to say the risk factor "causes" the disease (for example in a study of the link between smoking and lung cancer). en.wikipedia.org /wiki/Risk_factor   (274 words)

Q factor - Wikipedia, the free encyclopedia The optical Q is equal to the ratio of the resonant frequency to the FWHM bandwidth of the cavity resonance. The Q factor or quality factor is a measure of the "quality" of a resonant system. In optics, the Q factor of a resonant cavity is given by en.wikipedia.org /wiki/Q_factor   (436 words)

Emission factor - Wikipedia, the free encyclopedia An emission factor can be defined as the average emission rate of a given pollutant for a given source, relative to units of activity. Carbon dioxide emissions from the combustion of fuel can be estimated with a high degree of certainty whatever the fuel is being used for as these emissions depend almost exclusively on the carbon content of the fuel, which is generally known with a high degree of certainty. For instance methane emissions from transport depend on the vehicle type, whether the vehicle has been fitted with emissions controls and so on. en.wikipedia.org /wiki/Emission_factor   (436 words)

Transcription factor - Wikipedia, the free encyclopedia Leucine zippers function in associating the transcription factors with each other. The transcription factors of this family are activated by the Janus Kinase JAK and dysregulation of this pathway is frequently observed in primary tumors and leads to increased angiogenesis and enhanced survival of tumors. Transcription factors can be selectively activated or deactivated by other proteins, often as the final step in signal transduction. en.wikipedia.org /wiki/Transcription_factor   (481 words)

Scale factor (Universe) - Wikipedia, the free encyclopedia The evolution of the scale factor is a dynamical question, determined by the equations of general relativity, which are presented in the case of a locally isotropic, locally homogeneous universe by the Friedmann equations. The scale factor, parameter of Friedmann-Lemaître-Robertson-Walker model, is a function of time which represents the relative expansion of the universe. The scale factor could, in principle, have units of length or be dimensionless. en.wikipedia.org /wiki/Scale_factor_(Universe)   (192 words)

Rho factor - Wikipedia, the free encyclopedia Rho factor is an essential protein in E. A ρ factor (rho factor) is a protein found in prokaryotes, especially E. As a result, the enzyme is released, and the distal regions of the transcription unit are never transcribed. en.wikipedia.org /wiki/Rho_factor   (785 words)

Power factor correction - Wikipedia, the free encyclopedia Power companies therefore require that customers, especially those with large loads, maintain the power factors of their respective loads within specified limits or be subject to additional charges. Engineers are often interested in the power factor of a load as one of the factors that affect the efficiency of power transmission. PFC returns the power factor of an electric AC power transmission system to very near unity by switching in or out banks of capacitors or inductors which act to cancel the inductive or capacitive effects of the load. en.wikipedia.org /wiki/Power_Factor_Correction   (888 words)

Lorentz factor - Wikipedia, the free encyclopedia The Lorentz factor is a convenient term to define in special relativity. The Lorentz factor applies to time dilation, length contraction and relativistic mass relative to rest mass in Special Relativity. It has been suggested that Lorentz term be merged into this article or section. en.wikipedia.org /wiki/Lorentz_factor   (322 words)

Limiting - Wikipedia, the free encyclopedia Limiting can refer to non-linear clipping, in which a signal is passed through normally but "sheared off" when it would normally exceed a certain threshold. Limiting: Any process by which a specified characteristic (usually amplitude) of the output of a device is prevented from exceeding a predetermined value. Soft limiting is limiting in which the transfer function of a device is a function of its instantaneous or integrated output level. en.wikipedia.org /wiki/Limiting   (225 words)

Factor XII - Wikipedia, the free encyclopedia Hageman factor was first discovered in 1955 when a routine preoperative blood sample of the 37-year-old railroad brakeman John Hageman was found to have prolonged clotting time in test tubes, even though he had no haemorrhagic symptoms. Hageman factor deficiency is a rare hereditary disorder with a prevalence of about one in a million, although it is a little more common among Asians. Ratnoff later found that the Hageman factor deficiency is autosomal recessive disorder, when examining several related people which had the deficiency. en.wikipedia.org /wiki/Factor_XII   (225 words)

The damping factor The Damping Factor is a measure of an amplifiers internal impedance. The damping factor is a little known parameter of an amplifier in this country. he Damping factor is a property of an audio power amplifier, and is a measure of its electrical performance. www.studio-systems.com /audiofeatures/novdec99/dampingFactor/damp01.htm   (325 words)

Confounding factor - Wikipedia, the free encyclopedia In statistics, a confounding factor is a factor which is the common cause of two things that may falsely appear to be in a causal relationship. Neither: they are joint effects of a common cause or confounding factor, namely, hot weather. In statistical experimental design, attempts are made to remove confounding factors from the experiment. en.wikipedia.org /wiki/Confounding_factor   (115 words)

Discount - Wikipedia, the free encyclopedia The discount factor', P(T), is the number by which a future cash flow to be received at time T must be multiplied in order to obtain the current present value. The discounted value of a cash flow is determined by reducing its value by the appropriate discount rate for each unit of time between the time when the cashflow is to be valued to the time of the cash flow. The discount rate used in financial calculations is usually chosen to be equal to the cost of capital. en.wikipedia.org /wiki/Discount   (334 words)

NHF Bleeding Disorders Information Center Factor XIII Deficiency Factor XIII is responsible for clot stabilization and cross linking of the fibrin polymer in blood. The reason is that factor XIII—fibrin stabilization factor—is necessary for clot formation and wound healing. Factor XIII deficiency is a severe bleeding disorder usually associated with trauma. www.hemophilia.org /bdi/bdi_types11.htm   (334 words)

Factor XIII - Wikipedia, the free encyclopedia Factor XIII or fibrin stabilizing factor is an enzyme( Factor XIII consists of twice two subunits (2 A and 2 B), the genes for which are on different chromosomes: Factor XIII is activated by thrombin into factor XIIIa; its activation into Factor XIIIa requires calcium as a en.wikipedia.org /wiki/Factor_XIII   (334 words)

Factor VIII - Wikipedia, the free encyclopedia Thrombin cleaves fibrinogen into fibrin which polymerizes and crosslinks (using Factor XIII) into a blood clot. Upon activation by thrombin or factor Xa, it dissociates from the complex to interact with Factor IXa the coagulation cascade. It is a cofactor to Factor IXa in the activation of Factor X, which, in turn, with its cofactor Factor Va, activates more thrombin. en.wikipedia.org /wiki/Factor_VIII   (276 words)

Scale factor - Wikipedia, the free encyclopedia In the equation y = Cx, C is the scale factor for x. There is also a scale factor for the expansion of the Universe. C is also the coefficient of x, and may be called the constant of proportionality of y to x. en.wikipedia.org /wiki/Scale_factor   (111 words)

Ideal (ring theory) - Wikipedia, the free encyclopedia In the ring Z of integers, every ideal can be generated by a single number (so Z is a principal ideal domain), and the ideal determines the number up to its sign.The concepts of "ideal" and "number" are therefore almost identical in Z (and in any principal ideal domain). In ring theory, a branch of abstract algebra, an ideal is a special subset of a ring. The map p from R to R/I defined by p(a) = a + I is a surjective ring homomorphism (or ring epimorphism) whose kernel is the original ideal I. en.wikipedia.org /wiki/Ideal_(ring_theory)   (1343 words)

Quality factor The quality factor was introduced to define the dose equivalent based on the fact that the probability of stochastic radiation effects not only depends on the absorbed dose but also on the radiation type. The quality factor considers the influence of the different energy distribution - which varies according to the different types of rays - in the cellular area in the irradiated body. Quality factor Q is a function of the unrestricted linear energy transfer L. The following relation has been fixed between the quality factor and the unrestricted linear energy transfer L: Unrestricted linear energy transfer L in water, (keV µm www.euronuclear.org /info/encyclopedia/q/quality-factor.htm   (123 words)

Lorentz transformation - Wikipedia, the free encyclopedia The Lorentz transformations were published in 1897 and 1900 by Joseph Larmor and by Hendrik Lorentz in 1899 and 1904. The composition of two Lorentz transformations is a Lorentz transformation and the set of all Lorentz transformations with the operation of composition forms a group called the Lorentz group. Larmor's (1897) and Lorentz's (1899, 1904) final equations were not in the modern notation and form, but were algebraically equivalent to those published (1905) by Henri Poincaré, the French mathematician, who revised the form to make the four equations into the coherent, self-consistent whole we know today. en.wikipedia.org /wiki/Lorentz_transformation   (1312 words)

Impact factor - Wikipedia, the free encyclopedia This emphasizes the fact that the impact factor refers to the average number of citations per paper, and this is more a skewed than a gaussian distribution. An impact factor is a measure of the importance of scientific journals. Impact factors have a huge, but controversial, influence on the way published scientific research is perceived and evaluated. en.wikipedia.org /wiki/Impact_Factor   (931 words)

Factor XII Activity Factor XII is an 80,000 Dalton single-chain proenzyme that is synthesized in the liver. Factor XII deficiency is usually inherited in an autosomal recesssive manner and heterozygous deficiency is relatively common, affecting somewhere between 1.5 and 3.0 percent of the population. Factor XII-depleted plasma is used as the substrate and the clotting time with the patient plasma is compared to the clotting time of normal pooled plasma. www.labcorp.com /datasets/labcorp/html/chapter/mono/cf001200.htm   (931 words)

Factor Two factor theory Herzberg’s Two-Factor Theory was developed by Frederick Herzberg, an academic who concluded that at wo... Factor A factor can be: a person acting as a mercantile agent a number that is a divisor of another number in mathematic... Factor V Leiden Factor V Leiden is a hypercoagulability disorder in which, Factor V, one of the hereditary hypercoagulab... www.brainyencyclopedia.com /topics/factor.html   (931 words)

Insulin-like growth factor - Wikipedia, the free encyclopedia Insulin-like growth factor 1 (IGF-1) is mainly secreted by the liver as a result of stimulation by growth hormone (hGH). The insulin-like growth factors (IGFs) are polypeptides with high sequence similarity to insulin. "Insulin-like growth factors (IGFs), IGF receptors, and IGF-binding proteins in primary cultures of prostate epithelial". en.wikipedia.org /wiki/Insulin-like_growth_factor   (653 words)

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