These tetrahedra can be polymerized to give the subclasses: orthosilicates ( no polymerization, thus single tetrahedra ), disilicates ( two tetrahedra bonded together ), cyclosilicates ( rings of tetrahedra ), inosilicates ( chains of tetrahedra ), phyllosilicates ( sheets of tetrahedra ), and tectosilicates ( three-dimensional network of tetrahedra ).

These silica tetrahedra are then polymerized to some degree to create various structures, such as one-dimensional chains, two-dimensional sheets, and three-dimensional frameworks.

In addition to the tetrahedra, phyllosilicates have a sheet of octahedra ( elements in six-fold coordination by oxygen ) that balanced out the basic tetrahedra, which have a negative charge ( e. g. < sup > 4 -</ sup >) These tetrahedra ( T ) and octahedra ( O ) sheets are stacked in a variety of combinations to create phyllosilicate groups.

These forms differ in terms of the relative orientations of the constituent P < sub > 4 </ sub > tetrahedra.

These childhood experiences are sources of the self-certainty that the adolescent needs, for experimenting with many roles, and for the freedom to fail sometimes in the process of exploring and discovering her skills and abilities.

These antigens can sometimes be presented by tumor cells and never by the normal ones.

These were sometimes combined into the one device.

These are also sometimes called simply AC1, AC2, etc., and, somewhat confusingly, sometimes Roman numerals are used for these isoforms that all belong to the overall AC class III.

These compounds, e. g. calicheamicin, are some of the most aggressive antitumor drugs known, so much so that the ene-diyne subunit is sometimes referred to as a " warhead.

These two sequences converge to the same number, which is the arithmetic – geometric mean of and ; it is denoted by, or sometimes by.

These Sunday laws enacted at the state and local levels would sometimes carry penalties for doing non-religious activities on Sunday as part of an effort to enforce religious observance and church attendance.

These four-bit quantities are sometimes called nibbles, and correspond to hexadecimal digits.

These are sometimes known as signature bridges.

These may include a tire patch kit ( which, in turn, may contain any combination of a hand pump or CO < sub > 2 </ sub > Pump, tire levers, spare tubes, self-adhesive patches, or tube-patching material, an adhesive, a piece of sandpaper or a metal grater ( for roughing the tube surface to be patched ), and sometimes even a block of French chalk.

These fruit versions sometimes contain colored pearls ( and / or " jelly cubes " as in the related drink taho ), the color chosen to match whatever fruit juice is used.

These two styles ( K = 1024 and truncation ) were used loosely around the same time, sometimes by the same company.

These are sometimes called " the four pillars of the Big Bang theory ".

These toxins and the organisms that produce them are sometimes referred to as select agents.

These have sometimes been identified as another, separate work, the Ezra Memorial ( EM ), but other scholars believe the EM to be fictional and heavily altered by later editors.

These women are sometimes referred to as " keeners " and the best keeners would be in much demand.

These are sometimes referred to partial-inpatient programs.

These are often the same person, and the terms are sometimes used interchangeably.

These are sometimes called Weber functions after Heinrich Martin Weber, and also Neumann functions after Carl Neumann.

These groups are sometimes classified under denominations, though for theological reasons many groups reject this classification system.

These continued to dominate throughout the period, but during late Carboniferous, several other groups, Cycadophyta ( cycads ), the Callistophytales ( another group of " seed ferns "), and the Voltziales ( related to and sometimes included under the conifers ), appeared.

These peoples, sometimes referred to as the neo-Taíno nations, had migrated north along the Caribbean island chain.

" These extra copulas are sometimes called " semi-copulas " or " pseudo-copulas ".

These are also sometimes known as communities of practice.

These are few and seemingly disjointed data, but they illustrate the important fact that fundamental alterations in conditioned reactions occur in a variety of states in which the hypothalamic balance has been altered by physiological experimentation, pharmacological action, or clinical processes.

These quantum numbers only occur in certain combinations of values, and their physical interpretation changes depending on whether real or complex versions of the atomic orbitals are employed.

These are all L-stereoisomers ( left handed isomers ) although a few D-amino acids ( right handed ) occur in bacterial envelopes and some antibiotics.

These occur in brownish tones interlayered with white and gray.

These antidepressants typically have fewer adverse effects than the tricyclics or the MAOIs, although such effects as drowsiness, dry mouth, nervousness, anxiety, insomnia, decreased appetite, long-term weight gain and decreased ability to function sexually may occur.

These two inhibitory proteins are partially responsible for HeLa cells immortality by inhibiting apoptosis to occur.

These processes occur in tandem at site-specific locations.

These occur in years 3, 11, and 14 of the Gregorian 19-year cycle ( corresponding respectively to years 19, 8, and 11 of the Jewish 19-year cycle ).

These two layers occur only in endometrium lining the cavity of the uterus, not in the lining of the Fallopian tubes:

These alignment effects only occur at temperatures below a certain critical temperature, called the Curie temperature ( for ferromagnets and ferrimagnets ) or the Néel temperature ( for antiferromagnets ).

* Reversals or Sweeps: These occur when a grappler who was underneath his or her opponent on the ground is able to maneuver so that he or she gains a top position over his opponent.

These specifications mostly occur in non-European contexts – such as the coat of arms of Nunavut and the former Republic of Bophuthatswana, with the arms of North Dakota ( as distinguished from its seal ) providing an even more unusual example, while the State of Connecticut specifies a " rococo " shield – but not completely, as the Scottish Public Register records an escutcheon of oval form for the Lanarkshire Master Plumbers ' and Domestic Engineers ' ( Employers ') Association, and a shield of square form for the Anglo Leasing organisation.

These type of clusters only occur in onsets.

These events occur at the last quarter of the lunar month, as the reproductive cycle of the palolos is synchronised with the moon.

These errors, called mutations, can have an impact on the phenotype of an organism, especially if they occur within the protein coding sequence of a gene.

These pathways occur within all living organisms in some form:

These situations may also occur when a player has a made hand with little chance of improving what is believed to be currently the best hand, but an opponent continues to bet.

These terms have been used in interchangeable ways which can allow for cognitive and clinical diagnostic misjudgment to occur.

These freshwater pearl mussels occur not only in hotter climates, but also in colder more temperate areas such as Scotland ( where they are totally protected under law ).

These amino acids, except the-amino acids, do not occur in proteins and are thought to help protect against attacks by most peptidases.

These solutions yield good rational approximations of the form x / y to the square root of n. In Cartesian coordinates, the equation has the form of a hyperbola ; it can be seen that solutions occur where the curve has integral ( x, y ) coordinates.

These blooms occur almost annually along Florida waters.

These reactions occur at far higher energies than with non-ionization radiation, which requires only single particles to ionize.

These are recorded in the books of Exodus and Deuteronomy and do not necessarily occur on Sabbath.

These sensations can serve as a warning to that a generalized tonic – clonic seizure is about to occur.