Atom one particle‚ one piece of an element
(a = not‚ without; tom = to cut)
Australian Realm the biogeographical realm including the continent of Australia and some of the surrounding islands
(austr(ali) = southern) ...
atom The smallest indivisible particle of matter that can have an independent existence.
atomic number The number of protons in the nucleus of an atom.
atom
[Gk. atomos, indivisible]
The smallest unit of matter that retains the properties of an element.
atomic number ...
Atom Sciences, Inc., Oak Ridge, TN 37830
Two projects aimed at developing new techniques that measure DNA hybridization to oligonucleotide (ODN) probes on DNA chips will be described.
Atom
(Science: chemistry, physics, radiobiology) a particle of matter indivisible by chemical means. It is the fundamental building block of the chemical elements.
Atom
Van der Waals molecule
Diatomic molecule
History of the molecule
Chemical polarity
Molecular geometry
Covalent bond
Noncovalent bonding
list of compounds for a list of chemical compounds
List of molecules in interstellar space ...
atom The basic unit of matter; the smallest complete unit of the elements, consisting of protons, neutrons, and electrons.
atomic mass A mass unit determined by arbitrarily assigning the carbon-12 isotope a mass of 12 atomic mass units.
An atom with only one shell requires two electrons to complete its outer shell. Atoms with more than one shell require 8 electrons to complete their outer shells.
Periodic Table of the Elements ...
A carbon atom double-bonded to an oxygen and single-bonded to a hydroxyl group (OH).
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
a hydrogen atom
an amino group (hence "amino" acid)
a carboxyl group (-COOH). This gives up a proton and is thus an acid (hence amino "acid")
one of 20 different "R" groups.
ion An atom that has lost or gained electrons from its outer shell and therefore has a positive or negative charge, respectively; symbolized by a superscript plus or minus sign and sometimes a number, e.g., H+, Na+1, Cl-2.
ion -- an atom or small molecule which carries a positive or negative charge.
A unit of measurement equal to the mass of a hydrogen atom, 1.67 x 10E-24 gram/L (Avogadro's number). Death phase. The final growth phase, during which nutrients have been depleted and cell number decreases. (See Growth phase. Denature.
5' or 3' end The nucleoside residues which form nucleic acids are joined by phosphodiester linkages between the 3' C atom of one ribose moiety and the 5' C atom of the next.
This `dark side' of oxygen relates directly to the fact that each oxygen atom has one unpaired electron in its outer valence shell, and molecular oxygen has two unpaired electrons.
Biology is a science full of terms and concepts that range from the hard-to-imagine, such as the structure of an atom, to those we see every day, such as the structure of our own face in the mirror. How are these ideas and concepts related?
It is composed of one oxygen atom and two hydrogen atoms. Each hydrogen atom is covalently bonded to the oxygen via a shared pair of electrons. Oxygen also has two unshared pairs of electrons.
The aldehyde or ketone group may react with a hydroxyl group on a different carbon atom to form a hemiacetal or hemiketal , in which case there is an oxygen bridge between the two carbon atoms, forming a heterocyclic ring.
Each atom of the living beings was originated in a star. The Iron of hemoglobin was generated in the moment when the atomic nuclei of a star fused to form heavier elements; for example Iron.
allowed ranges of the angles Ö and Ø for amino acid residues in polypeptide chains; for each residue, its conformation in the main chain of a polypeptide can be completely defined by Ö (the degree of rotation at the bond between the nitrogen atom and ...
A weak electrostatic link between an electronegative atom (such as oxygen) and a hydrogen atom which is linked covalently to another electronegative atom; hydrogen bonding is what makes water stick to itself.
Deoxyribonucleic acid (DNA) ...
We're really reducing the question down to the smallest atom, and trying to understand at an anatomical level the structure of this receptor and how it's activated and how is it doing its job during this process of male sexual differentiation.
A reversible change in the position of a hydrogen atom in a molecule which results in the conversion of the molecule between different isomers. A shift between the keto group and a enoyl group in nucleotides can result in altered base-pairing.
Hydrogen bond. A relatively weak bond formed between a hydrogen atom (which is covalently bound to a nitrogen or oxygen atom) and a nitrogen or oxygen with an unshared electron pair.
Dalton - measure of molecular weight or mass. One hydrogen atom has mass of 1 Da. Proteins and other macromolecule molecular weights are usually measured in kDa or kD (kilodaltons) - 1000 Da.
A chemical process in which either electrons are lost from an atom, or oxygen is added to a molecule. Oxidation may also occur without the addition of oxygen if hydrogen is removed (dehydrogenation.)
Covered in BIOL1020 Lab 4 Cell Energetics I ...
1. The membrane bound organelle containing the genome of eukaryotes organized into chromosomes.
2. The center portion of an atom which contains the protons and neutrons.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
A secondary feature of some proteins containing a zinc atom; a DNA-binding protein.
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acids in a protein and hence protein function are determined by the genetic code.
Amino acids contain a basic amino (NH2) group, an acidic carboxyl (COOH) group and a side chain (R - of a number of different kinds) attached to an alpha carbon atom.
 See also: Molecule, Organ, Protein, Trans, Cells
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