exogen

Definitions

  • WordNet 3.6
    • n exogen flowering plant with two cotyledons; the stem grows by deposit on its outside
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Webster's Revised Unabridged Dictionary
    • n Exogen (Bot) A plant belonging to one of the greater part of the vegetable kingdom, and which the plants are characterized by having c wood bark, and pith, the wood forming a layer between the other two, and increasing, if at all, by the animal addition of a new layer to the outside next to the bark. The leaves are commonly netted-veined, and the number of cotyledons is two, or, very rarely, several in a whorl. Cf. Endogen.
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Century Dictionary and Cyclopedia
    • n exogen In botany, a plant in which the growth of the stem is in successive concentric layers. The exogens, otherwise called dicotyledons (see dicotyledon), form the larger of the two classes into which phænogamous plants are divided. They are usually considered as including two subclasses, the angiosperms and the gymnosperms, though the latter, which have essentially the same structure and mode of growth, but differ in having naked ovules, are by some late authorities separated as a distinct class. See endogen.
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Chambers's Twentieth Century Dictionary
    • n Exogen eks′o-jen a plant belonging to the great class that increases by layers growing on the outside of the wood
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Etymology

Webster's Revised Unabridged Dictionary
Exo-, + -gen,: cf. F. exogène,
Chambers's Twentieth Century Dictionary
L. exō, outside, and gen, root of gignesthai, to be produced.

Usage

In literature:

We don garment after garment, as if we grew like exogenous plants by addition without.
"Walden, and On The Duty Of Civil Disobedience" by Henry David Thoreau
Those trees called exogenous grow by means of successive layers on the outside.
"Missionary Travels and Researches in South Africa" by David Livingstone
It did not end with parties, Miss Pennington's exogenous experiment.
"We Girls: A Home Story" by Mrs. A. D. T. Whitney
EXOGENS, the name for the order of plants whose stem is formed by successive accretions to the outside of the wood under the bark.
"The Nuttall Encyclopaedia" by Edited by Rev. James Wood
The botanical classifications based upon morphology are so frequently Saponin is found in endogens and exogens.
"Scientific American Supplement, No. 623, December 10, 1887" by Various
Course of fluids in exogenous stems.
"Proserpina, Volume 1" by John Ruskin
You must know before anybody else how the exogens are to be completely divided.
"Hortus Inclusus" by John Ruskin
Of that Chapter, In Prison, we have given what might be called the exogenous bark of the Soul, or that which environment creates.
"The Book of Khalid" by Ameen Rihani
Certain investigations have indicated that bacteria, at least, develop exogenous vitamines which are beneficial to the growth of other plants.
"The Chemistry of Plant Life" by Roscoe Wilfred Thatcher
The wood of a Fern-trunk is very different, however, from that of a palm, or of any exogenous stem either.
"The Elements of Botany" by Asa Gray
They are to be found in all exogens.
"Wood and Forest" by William Noyes
EXOGENOUS STRUCTURES, in botany, are those which arise from superficial tissues of the parent organ, as stem-branches and leaves.
"The New Gresham Encyclopedia" by Various
There seem to be a few Endogens, but no true Exogens.
"The Chain of Life in Geological Time" by Sir J. William Dawson
We have in the botanical world the exogenous and the endogenous tree.
"The Palm Tree Blessing" by W. E. Shepard
For the moment, however, we may consider exogenous controls only.
"The Breeding Birds of Kansas" by Richard F. Johnston
CLASS I. DICOTYLEDONOUS OR EXOGENOUS PLANTS.
"The Manual of the Botany of the Northern United States" by Asa Gray
Is it exogenous or endogenous?
"Scurvy Past and Present" by Alfred Fabian Hess
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In news:

The concluding volume of McCarthy's Subterrene War near-future military-powered science fiction trilogy (after Germline and Exogene) is an impressively deep and profoundly moving character study.
Whether exogenous exposure to varicella zoster-virus protects individuals with latent varicella-zoster virus infection against herpes zoster by boosting immunity is not known.
We focus, primarily, on the validation of plans in the context of exogenous events, discussing the modelling, semantic and implementation issues that arise.
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In science:

Nevertheless, it also depends on the vector of initial ratings, which is exogenous to the tournament.
Ranking Participants in Tournaments by means of Rating Functions
In a modelization, errors on data are exogenous, we do not know exactly from where they come.
Bringing errors into focus
In particular, Gabaix (1999) assumed that, for cities of small sizes, there are some exogenous factors preventing further decaying of their population (see also (Levy and Solomon 1996, Malcai et al. 1999)).
Theory of Zipf's Law and of General Power Law Distributions with Gibrat's law of Proportional Growth
We will consider two different mechanisms for the exit of a firm: (i) when the firm total asset value becomes smaller than a given minimum threshold (which can vary with time and with countries) and (ii) when an exogenous shock occurs, modeling for instance operational risks, independently of the size of the firm.
Theory of Zipf's Law and of General Power Law Distributions with Gibrat's law of Proportional Growth
Variables from predicted to MA(3) are weakly exogenous.
Inflation as a function of labor force change rate: cointegration test for the USA
We consider the latter two variables as exogenous in the regression.
Relationship between inflation, unemployment and labor force change rate in France: cointegration test
The motivation for the Blume and Easley model was to understand whether rationality is the only criterion for survival under natural selection, a topic that has generated considerable interest in the evolutionary economics literature.2 All of the work above assumes that ob jective outcomes are exogenously given.
The Reality Game
Physical layer scheduling decisions are made at the level of packets, and packet-level models with exogenous arrival processes have long been employed to study network performance, as well as design scheduling policies that more efficiently utilize network resources.
On the Flow-level Dynamics of a Packet-switched Network
However, they model the arrival of new packets to the network exogenously.
On the Flow-level Dynamics of a Packet-switched Network
In order to construct the stability region under the MWUM-α policy, first define the set of packet arrival rates by Λ , nλ ∈ RE + with λ ≤ Πs, 1⊤ s ≤ 1o . + : ∃ s ∈ RS Imagine that the network has no packet arrivals from flows, but instead has packets arriving according to exogenous processes.
On the Flow-level Dynamics of a Packet-switched Network
Suppose that λ ∈ RE + is the vector of exogenous arrival rates, so that packets arrived to each queue e at rate λe .
On the Flow-level Dynamics of a Packet-switched Network
The quantity PRIMAL(λ) is called the effective load of a system with exogenous packet arrivals at rate λ.
On the Flow-level Dynamics of a Packet-switched Network
Now, in our model, packets arrive to the network not through an exogenous process, but rather, they are generated by flows.
On the Flow-level Dynamics of a Packet-switched Network
Therefore, certain objective function has to be exogenously chosen so that we can find a unique distribution using an optimization method.
A Top-down Model for Cash CLO
Robust optimization was introduced in machine learning tasks to handle exogenous noise (e.g., Bhattacharyya et al., 2004; Shivaswamy et al., 2006; Globerson and Roweis, 2006), i.e., the learning algorithm only has access to inaccurate observation of training samples.
Robustness and Generalization
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