What is an Epitheca?

What is an Epitheca?

Definition of epitheca 1 : an external calcareous layer investing the lower portion of the theca of many corals. 2 : the outer or upper half or valve of the diatom frustule — compare hypotheca.

What is Hypothica?

: the inner or bottom half or valve of the diatom frustule — compare epitheca.

What is the meaning of hardiness in science?

[hahr´dĭ-nes] a complex personality attribute that has been identified as a component in the maintenance of health and is the focus of intensive research activities. Generally, there are three elements that contribute to hardiness: control, commitment, and challenge.

What does remains mean in science?

parts or substances remaining from animal or plant life that occur in the earth’s crust or strata: fossil remains; organic remains.

What is Hypotheca and Epitheca?

is that epitheca is (microbiology|planktology) the upper half of the theca of a thecate protist such as a diatom or dinoflagellate while hypotheca is (microbiology|planktology) the lower or posterior half of the theca of a thecate protist such as a diatom or dinoflagellate.

What is Frustule biology?

A frustule is the hard and porous cell wall or external layer of diatoms. The frustule is composed almost purely of silica, made from silicic acid, and is coated with a layer of organic substance, which was referred to in the early literature on diatoms as pectin, a fiber most commonly found in cell walls of plants.

What does hardiness mean for plants?

Hardiness of plants describes their ability to survive adverse growing conditions. It is usually limited to discussions of climatic adversity. In temperate latitudes, the term most often describes resistance to cold, or “cold-hardiness”, and is generally measured by the lowest temperature a plant can withstand.

What is a plant zone?

The 2012 USDA Plant Hardiness Zone Map is the standard by which gardeners and growers can determine which plants are most likely to thrive at a location. The map is based on the average annual minimum winter temperature, divided into 10-degree F zones.

What is the difference between remains and body?

IMO, they are different, for “remains” could also mean “ashes,” while “body” can’t. But from the context, it is unlikely to be ashes, and remains is a common euphemism for a body. ” The decedent’s remains were removed to the morgue”.

What constitutes human remains?

Human remains means a deceased human body or any portion of a deceased human body, except: Clean, dry bones or bone fragments; human hair; teeth; fingernails or toenails; or. A deceased human body and portions thereof that have already been fully cremated before import; or.

What is Epitheca and Hypotheca in diatoms?

What is Epivalve and Hypovalve?

(a) The diatom is composed of an epitheca and hypotheca that fit together like a petri dish. Each theca is composed of the valve face (epivalve or hypovalve) and the valve mantle. A cross section of the diatom reveals that the pores present on the external valve face penetrate to the internal face.