Posts made by Julene

A jacket crown, also known as a dental crown or tooth crown, is a type of dental restoration which completely encircles a tooth or dental implant. It is typically bonded to the tooth using a dental cement. Jacket crowns are often used when a large cavity threatens the health of a tooth. They are typically made from materials such as porcelain or metal.

lacking in sophistication or worldliness

pantropical genus of somewhat poisonous shrubs and small trees

Tolerant, especially of other peoples religious views.

hinge joint between the forearm and upper arm and the corresponding joint in the forelimb of a quadruped

a person who sings

having white lips from fear or terror

Food created from a plant.

In organic chemistry, an alkane, or paraffin (a historical trivial name that also has other meanings), is an acyclic saturated hydrocarbon. In other words, an alkane consists of hydrogen and carbon atoms arranged in a tree structure in which all the carbon–carbon bonds are single. Alkanes have the general chemical formula CnH2n 2. The alkanes range in complexity from the simplest case of methane (CH4), where n = 1 (sometimes called the parent molecule), to arbitrarily large and complex molecules, like pentacontane (C50H102) or 6-ethyl-2-methyl-5-(1-methylethyl) octane, an isomer of tetradecane (C14H30).
The International Union of Pure and Applied Chemistry (IUPAC) defines alkanes as acyclic branched or unbranched hydrocarbons having the general formula CnH2n 2, and therefore consisting entirely of hydrogen atoms and saturated carbon atoms. However, some sources use the term to denote any saturated hydrocarbon, including those that are either monocyclic (i.e. the cycloalkanes) or polycyclic, despite their having a distinct general formula (i.e. cycloalkanes are CnH2n).
In an alkane, each carbon atom is sp3-hybridized with 4 sigma bonds (either C–C or C–H), and each hydrogen atom is joined to one of the carbon atoms (in a C–H bond). The longest series of linked carbon atoms in a molecule is known as its carbon skeleton or carbon backbone. The number of carbon atoms may be considered as the size of the alkane.
One group of the higher alkanes are waxes, solids at standard ambient temperature and pressure (SATP), for which the number of carbon atoms in the carbon backbone is greater than about 17.
With their repeated –CH2 units, the alkanes constitute a homologous series of organic compounds in which the members differ in molecular mass by multiples of 14.03 u (the total mass of each such methylene-bridge unit, which comprises a single carbon atom of mass 12.01 u and two hydrogen atoms of mass ~1.01 u each).
Methane is produced by methanogenic bacteria and some long-chain alkanes function as pheromones in certain animal species or as protective waxes in plants and fungi. Nevertheless, most alkanes do not have much biological activity. They can be viewed as molecular trees upon which can be hung the more active/reactive functional groups of biological molecules.
The alkanes have two main commercial sources: petroleum (crude oil) and natural gas.
An alkyl group is an alkane-based molecular fragment that bears one open valence for bonding. They are generally abbreviated with the symbol for any organyl group, R, although Alk is sometimes used to specifically symbolize an alkyl group (as opposed to an alkenyl group or aryl group).

the Ottoman court in Constantinople

wheat with hard dark-colored kernels high in gluten and used for bread and pasta; grown especially in southern Russia, North Africa, and northern central North America

to affect the olfactory nerves; to have an odor or scent; -- often followed by of; as, to smell of smoke, or of musk

a small Hawaiian tree with hard dark wood

move along very quickly

a native or inhabitant of ancient Mycenae

A thrust fault is a break in the Earths crust, across which older rocks are pushed above younger rocks.

that seeks something specified

An order of the class MAMMALS that consists of one family, TUPAIIDAE (tree shrews), 5 genera (one of which is TUPAIA), and 16 species. Their recent distribution is from India to the Philippines, southern China to Java, Borneo, Sumatra, Bali, and other islands in those regions.

Watchfulness on every side; cautious; general attention.

Chemistry is the scientific study of the properties and behavior of matter. It is a natural science that covers the elements that make up matter to the compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during a reaction with other substances. Chemistry also addresses the nature of chemical bonds in chemical compounds.
In the scope of its subject, chemistry occupies an intermediate position between physics and biology. It is sometimes called the central science because it provides a foundation for understanding both basic and applied scientific disciplines at a fundamental level. For example, chemistry explains aspects of plant growth (botany), the formation of igneous rocks (geology), how atmospheric ozone is formed and how environmental pollutants are degraded (ecology), the properties of the soil on the moon (cosmochemistry), how medications work (pharmacology), and how to collect DNA evidence at a crime scene (forensics).