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  2. Cereal growth staging scales - Wikipedia

    en.wikipedia.org/wiki/Cereal_growth_staging_scales

    Beginning of the erection of the pseudo-stem; leaf sheaths beginning to lengthen. 5: Pseudo-stem (formed by sheaths of leaves) strongly erected. Stem Extension 6: First node of stem visible at base of shoot. 7: Second node of stem formed; next-to-last leaf just visible. 8: Flag leaf (last leaf) visible but still rolled up; ear beginning to swell. 9

  3. Spanish irregular verbs - Wikipedia

    en.wikipedia.org/wiki/Spanish_irregular_verbs

    There are two kinds of changes that can affect stem vowels of some Spanish verbs: diphthongization and vowel raising. Both changes affect -e-or -o-in the last (or only) syllable of a verb stem. Diphthongization changes -e-to -ie-, and -o-to -ue-. Vowel raising changes the mid vowels-e-and -o-to the corresponding high vowels: -i-and -u-respectively.

  4. Spanish conjugation - Wikipedia

    en.wikipedia.org/wiki/Spanish_conjugation

    This is an Oy-Yo verb. Stem: s-, fu-, er-, se-. There are two ways to say "To be" in Spanish: ser and estar. They both mean "to be", but they are used in different ways. As a rule of thumb, ser is used to describe permanent or almost permanent conditions and estar to describe temporary ones. [11]

  5. Secondary growth - Wikipedia

    en.wikipedia.org/wiki/Secondary_growth

    Secondary growth thickens the stem and roots, typically making them woody.Obstructions such as this metal post and stubs of limbs can be engulfed. In botany, secondary growth is the growth that results from cell division in the cambia or lateral meristems and that causes the stems and roots to thicken, while primary growth is growth that occurs as a result of cell division at the tips of stems ...

  6. Environmental Health

    images.huffingtonpost.com/2009-01-27-1476069x82.pdf

    or the increasingly popular membrane technology that is mercury free and more energy-efficient. Worldwide there are approximately fifty mercury cell chlor-alkali plants in operation [1]. Of those there are eight in the United States (US) [2]. In 2003 the EPA reported in the Federal Register that on average approximately seven tons of mercury

  7. Diameter at breast height - Wikipedia

    en.wikipedia.org/wiki/Diameter_at_breast_height

    DBH is used in estimating the amount of timber volume in a single tree or stand of trees utilising the allometric correlation between stem diameter, tree height and timber volume. [8] It can also be used in the estimation of the age of veteran trees, given that diameter increment is the only "constant non-reversible feature of tree growth". [9]

  8. Apophony - Wikipedia

    en.wikipedia.org/wiki/Apophony

    Navajo vowel ablaut, depending on the verb, may be a change in vowel, vowel length, nasality, and/or tone. For example, the verb stem kaah/-ką́ 'to handle an open container' has a total of 16 combinations of the 5 modes and 4 aspects, resulting in 7 different verb stem forms (i.e. -kaah , -kááh , -kaał , -kááł , -ka’ , -ká , -ką́ ).

  9. Aerial stem modification - Wikipedia

    en.wikipedia.org/wiki/Aerial_stem_modification

    Grapevine tendrils and leaves. Thorns. Cladodes. Aerial stem modifications are modifications to the aerial stems, [1] vegetative buds and floral buds of plants growing in different conditions and which perform functions such as climbing, protection, support, synthesis of food, or vegetative propagation.