It is almost the only definitely known compound in which carbon seems to be divalent.

The metal is divalent and has a noticeably high volatility.

The reaction is catalyzed by a base and a divalent metal such as calcium.

Members of this family probably transport Mg or other divalent cations into the cell.

This bacterial enzyme that requires a divalent cation for activity.

The target ion in this case is divalent, Cu.

This enzyme requires a divalent metal such as Mn.

Divalent metals such as zinc, however, cannot be added as this will result in precipitation.

It is believed to exhibit resonance between its tetravalent and divalent carbon forms.

In both cases, the A-domains carry up to three divalent cation binding sites.

A divalent cation is missing two electrons as compared with the neutral atom.

Group 12 elements are all soft, diamagnetic, divalent metals.

It has a negligible capacity to bind divalent ions.

It is the divalent cobalt salt of sulfuric acid.

This argument is considered only if Concentration of divalent cations is specified.

He was open to the idea of divalent carbon, which Kekulé was not.

Divalent halide derivatives are known for all of the lanthanides.

Activity is dependent on the presence of reducing agent and shows no requirement for divalent cations (data not shown).

In these enzymes, a divalent cation, usually zinc, activates the water molecule.

It is a divalent element which occurs naturally only in combination with other elements in minerals.

A divalent cation is essential for activity.

Divalent europium is the source of the blue fluorescence, when seen in the mineral fluorite.

Representations of divalent groups in polymers.

The divalent organic ligand coordinated to the metal center is called a carbene.

Divalent cations (usually Mg) are generally required and appear to be closely involved in the enzymatic mechanism.

Let X be a formula with a classical bivalent truth value.

It was in trying to figure out what these regions did that the Broad team stumbled across the bivalent domains.

Bivalent verbs together with subject have also one object (direct or indirect).

A bivalent engine is an engine that can use two different types of fuel.

In bivalent logics, given an interpretation, this atomic formula will then be true or false.

In fuzzy set theory, classical bivalent sets are usually called crisp sets.

The intended semantics of classical logic is bivalent.

It is not the same as the law of excluded middle, however, and a semantics may satisfy that law without being bivalent.

The new findings raise the question of how the embryonic cell knows where on its chromosomes the bivalent domains should be established.

Those who swear by bivalent logic might simply be the ultimate keepers of the great fear of the flux.

The bivalent engine allows for an easier transition from fossil fuels to alternative fuels.

Bivalent chromatin is hypothesized to serve a role in genetic imprinting and in development.

A bivalent refers to the two homologous chromosomes (4 chromatids).

"We think the bivalent state is keeping the embryonic cells poised," Dr. Bernstein said.

Dr. Young's team has studied another aspect of embryonic stem cells which ties into the new finding about bivalent domains.

He has now found that these transcription factors bind at many of the bivalent domains created by the polycomb complex.

The aggregation appears as a cap or a patch in the fluorescence microscope and is due to the bivalent nature of antibodies.

Once the cell starts to differentiate, these bivalent promoters are resolved to either active or repressive states depending on the chosen lineage.

In Megrelian the verbs can be monovalent, bivalent or trivalent.

The paired chromosomes are called bivalent or tetrad chromosomes.

A logic satisfying this principle is called a two-valued logic or bivalent logic.

The common-sense approach of people who have not been overeducated in such matters is that the world is multivalent, not bivalent.

If one of the tanks is empty, the bivalent BMW engine unit switches over automatically to the other fuel system.

BMW has developed a bivalent internal combustion engine that can switch between petroleum and liquid hydrogen fuels.

Bivalent ligands are usually large and tend not to be 'drug-like', limiting their applicability in clinical settings.

The physical basis of the independent assortment of chromosomes is the random orientation of each bivalent chromosome along the metaphase plate with respect to the other bivalent chromosomes.