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Topic: Electropositive

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In the News (Wed 21 Aug 19)

  United States Patent Application: 0040091925
The solid phase matrix exhibits sufficient hydrophilicity and electropositivity to tightly bind the nucleic acids in a sample.
Electropositive elements can be rendered sufficiently hydrophilic by hydroxyl (--OH) or other groups, resulting in a solid phase matrix that tightly binds DNA, while proteins or inhibitors do not bind to the solid phase matrix.
Examples of electropositive materials suitable for purposes of this invention include, but are not limited to, materials generally containing one or more elements selected from the group consisting of aluminum, titanium, zirconium, hafnium, scandium, yttrium, lanthanum, vanadium, tantalum, chromium, molybdenum, tungsten, boron, gallium, indium, germanium, tin, and lead.
appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=/netahtml/PTO/search-adv.html&r=1&f=G&l=50&d=PG01&S1=589,560&OS=589,560&RS=   (13229 words)

 Electropositive   (Site not responding. Last check: 2007-10-21)
English words defined with "electropositive": atomic number 55 ♦ caesium, carbide, cesium, Cs ♦ nitride ♦ silicide, sulfide, sulphide ♦ telluride.
"Electropositive" is generally used as an adjective (general or positive) -- approximately 100.00% of the time.
"Electropositive" is used about 2 times out of a sample of 100 million words spoken or written in English.
www.websters-online-dictionary.org /el/electropositive.html   (371 words)

Because of the reversals at the unit levels, the north pole of an electronegative atom corresponds to counterclockwise rotation; that is, this north pole occupies a position corresponding to that which is occupied by the south pole of an electropositive atom.
When electropositive elements are subjected to the field of a magnet, the orientation of the poles is the same in both the atoms and the magnet (which is similarly positive).
All elements of the electropositive divisions I and II, except beryllium and boron, are paramagnetic.
www.reciprocalsystem.com /bpm/bpm22.htm   (4076 words)

 Nat' Academies Press, Identifying Future Drinking Water Contaminants (1999)
Subsequently, filters that are electropositive near neutral pH and adsorb viruses directly without acidifying or adding cations salts to the water were developed for virus concentration (De Leon and Sobsey, 1991).
Electropositive filter media are composed of charge-modified fiberglass sold commercially as disks or pleated cartridges, fiberglass filter disks that are coated with precipitated aluminum or iron salts, or positively charged, natural quartz fiberglass that one packs into a column to make an adsorbent filter.
Viruses adsorbed to both electronegative or electropositive filters are subsequently eluted and recovered by passing a relatively small volume of aqueous elution medium through the filter.
www.nap.edu /books/0309064325/html/186.html   (956 words)

 Ultra Pure Water- Turbidity Filters   (Site not responding. Last check: 2007-10-21)
The nano fibers are dispersed throughout a microglass fiber matrix resulting in a media with 2 micron average pore size and with water flux typically of that pore size.
Asbestos fiber filters (which are electropositive) had been used for more than a century until it was found to be a health hazard.
Membranes have been modified to provide some electropositive functionality but their flow resistance is very high and because they are surface filters, they are prone to clogging.
www.argonide.com /pure_water.html   (2071 words)

 W0153: Structure of an Active Mutant of the Membrane- Associated (S)-Mandelate Dehydrogenase   (Site not responding. Last check: 2007-10-21)
MDH has a distinctly electropositive surface capable of interacting with the membrane while the opposite surface is largely electronegative.
The putative N-terminus of the membrane-binding segment in MDH is located close to the electropositive surface of the tetramer and the C-terminus is further away.
A model is proposed for the binding of MDH to the membrane, which is stabilized in part by ionic attraction between the electropositive surface of the MDH tetramer and the negatively charged phospholipid head groups of the membrane.
www.hwi.buffalo.edu /ACA/ACA01/abstracts/text/W0153.html   (361 words)

 Materials with high
Depending on the particular electropositive element, exciting low temperature properties are found for these skutterudites.
The loosely bound electropositive element in the cage interacts strongly with the lattice vibrations and thus can dramatically reduce the thermal conductivity.
The loosely bound electropositive element in the cage interacts strongly with the lattice vibrations and thus can dramatically reduce the overall thermal conductivity.
www.ifp.tuwien.ac.at /forschung/bauer/thermo.htm   (417 words)

 Basic Properties of Matter: Chapter III
When this arrangement unites one electropositive atom with each electronegative atom the resulting structure is usually a simple cube with the atoms of each element occupying alternate comers of the cube.
A feature of Table 9 is the appearance of one of the normally electropositive elements of group 2B, Aluminum, in the role of a Division III element.
It is of considerable value, however, in dealing with the lower electronegative elements, whose specific electric rotations are confined to the neutral values, and whose variability in the magnetic dimensions is only in the number of inactive dimensions (that is, dimensions in which the specific rotation is 2).
www.reciprocalsystem.com /bpm/bpm03.htm   (2482 words)

This means that although the water molecule as a whole is stable, the greater mass of the oxygen nucleus tends to draw in all the electrons in the molecule including the shared hydrogen electrons giving the oxygen portion of the molecule a slight electronegative charge.
This means water molecules have a tendency to form weak bonds with water molecules because the oxygen end of the molecule is negative and the hydrogen ends are positive.
After salt is placed in water, the attraction of the electronegative oxygen of the water molecule for the positively charged sodium ions, and the similar attraction of the electropositive hydrogen ends of the water molecule for the negatively charged chloride ions, are greater than the mutual attraction between the outnumbered NA+ and CL ions.
4optimallife.com /Water-Ionizers-Alkalizers-Science.html   (1888 words)

 Superior performance from electropositive filter: News from Argonide Nanomaterials
As compared to microglass, melt blown and membrane media, the new nanofilter is said to have superior performance for filtering particles from microns down to a few nanometers.
The proprietary technology is based on a highly electropositive filter that rapidly adsorbs particles, no matter how small.
The nominal pore size is two microns, yet the filter functions as if it had a 0.03 micron pore size rating, says Arginide.
www.laboratorytalk.com /news/ago/ago102.html   (327 words)

 Sunrise Water - Articles: Ionised Water explained   (Site not responding. Last check: 2007-10-21)
With dry salt (NaCl) the attraction between the electropositive sodium (Na+) and electronegative chlorine (Cl-) atoms of salt is very strong until it is placed in water.
After salt is placed in water, the attraction of the electronegative oxygen of the water molecule for the positively charged sodium ions, and the similar attraction of the electropositive hydrogen ends of the water molecule for the negatively charged chloride ions, are greater than the mutual attraction between the outnumbered Na+ and Cl- ions.
In water the ionic bonds of the sodium chloride molecule are broken easily because of the competitive action of the numerous water molecules.
www.sunrise-water.co.uk /artionisedwater.asp   (3988 words)

 Functional relevance of the disulfide-linked complex of the N-terminal PDZ domain of InaD with NorpA   (Site not responding. Last check: 2007-10-21)
Electropositive residues are shown in blue, while electronegative residues are shown in red.
There is a large electropositive pocket composed of residues in the carboxylate-binding loop.
Highly convex regions are shown in green, while highly concave regions are shown as increasingly darker gray.
www.nature.com /emboj/journal/v20/n16/fig_tab/7593939f5.html   (111 words)

 Control of Colloid Stability through Zeta Potential - Chapter 14 - part 2
But when these electropositive systems were serially and geometrically diluted, the colloid desorbed — and became (or tended to become) electronegative.
Despite the present technical consensus that chrysotile per se is electropositive, the writer believes reported electropositivity may be due to the accompanying (and generally extraneous) aluminum (and / or ferric) ions.
Therefore, the serum was electropositive, as in (1).
www.hbci.com /~wenonah/riddick/asbestos.htm   (8437 words)

 Frequently Asked Questions   (Site not responding. Last check: 2007-10-21)
The easiest way is to determine oxidation state of carbon is to look at each atom bonded to carbon and assign a +1 to the more electropositive atom in the bond and a -1 to the more electronegative atom.
Since hydrogen is more electropositive, it gets a +1 in the bond and the carbon gets a -1.
The atom that is more electronegative will have a partial negative charge and the atom that is less electronegative (more electropositive) has the partial positive.
web.uccs.edu /chemistry/organic_online/FAQ.htm   (1733 words)

 Periodic Table of the Elements
The 18 columns of the table are called the Chemical Groups, increasing in density and radioactivity and decreasing in reactivity.
The 7 rows are called the Periods, increasing in atomic numbers from the electropositive left to the electronegative right.
The actinides as a group are strongly electropositive, shiny, hard metals that tarnish in air.
periodictable.mysterymaster.com /report.html   (1316 words)

 ENGR321 W02 Midterm 1
As a whole, this group, on the right hand side of the periodic table, are electronegative.
There are lots of choices, but the trick is that the atoms must be either negatively or positiviely charged; neutral atoms are not ions.
As a whole, this group, on the left hand side of the periodic table, are electropositive.
oregonstate.edu /instruction/engr321/Exams/ExamsW02/ENGR321W02MTOne.html   (1571 words)

 Chemical Bonding - An Introduction
This information allows us to predict that compounds formed by the combination of an electropositive element with an electronegative element will involve the transfer of electron(s) from the electropositive element to the electronegative element and hence ionic bonding will occur.
The degree of ionic bonding will depend upon how extreme the differences are (in terms of electropositive / electronegative character) between the particular elements.
Electropositive character increases down the group whilst electronegative character increases up a group.
www.newi.ac.uk /buckleyc/bonding.htm   (2420 words)

 Electropositive Filter Membrane as an Alternative for the Elimination of PCR Inhibitors from Sewage and Water Samples ...
Electropositive Filter Membrane as an Alternative for the Elimination of PCR Inhibitors from Sewage and Water Samples -- Queiroz et al.
Electropositive Filter Membrane as an Alternative for the Elimination of PCR Inhibitors from Sewage and Water Samples
In summary, the use of electropositive filter membrane is appropriate
aem.asm.org /cgi/content/abstract/67/10/4614   (294 words)

 chemical history of ether   (Site not responding. Last check: 2007-10-21)
If an inorganic substance such as sodium chloride could be formed from electronegative chlorine and electropositive sodium, it followed, so the thinking went, that ethyl chloride, had as its electropositive unit, the radical ethyl.
In brief, Dumas (1839) was able to demonstrate that chlorination of acetic acid formed trichloroacetic acid by substitution of 3/4 of the hydrogens in acetic acid with chlorine, and that the two acids were of the same type, owing to their similar chemical properties.
Be reminded that the substitution of electronegative chlorine for electropositive hydrogen was anathema to the dualists, Berzelius in particular.
classes.yale.edu /chem220a/studyaids/history/ether/ether.html   (2452 words)

 Silicon (Si) - Chemical properties, Health and Environmental effects
Silicon is the most abundant electropositive element in The Earth’s crust.
It is usually tetravalent in its compounds, although sometimes its bivalent, and it’s purely electropositive in its chemical behaviour.
It’s almost as electropositive as tin and much more positive than germanium or lead.
www.lenntech.com /Periodic-chart-elements/Si-en.htm   (786 words)

 Bond Polarity
Electronegativity is the relative tendency of a bonded atom to attract electrons to itself.
When an extremely electronegative atom, like fluorine, bonds with an electropositive atom, like sodium, the resulting bond is ionic due to the huge difference in electronegativity (difference > ~1.7).
The electronegative atom's pull on the bonding electrons is so strong that it pulls the bonding electron off the electropositive atom resulting in two oppositely charged ions which are held together by electrostatic attraction (an ionic bond).
www.ausetute.com.au /bondpola.html   (581 words)

 Erowid Psychoactive Vaults : Chemistry Bonding and Structure   (Site not responding. Last check: 2007-10-21)
When sodium reacts with an electronegative element, for example chlorine, the single electron contained in the M shell is readily lost to give Na+ ion, with the stable electronic configuration of neon, K2 L8.
The group II elements are also electropositive and are collectively known as the alkaline earth metals.
All of the metals in this group contain 2 electrons in the outermost shell of their atoms, for example the electronic structure of magnesium is K2 L8 M2.
www.erowid.org /psychoactives/chemistry/chemistry_info3.shtml   (4588 words)

 Perreault Radiant Energy Patent
A sufficient amount of radiant energy applied to a reactive gas causes the gas to react ELECTROCHEMICALLY with the electropositive electrode.
This causes an electrical current to flow between the electropositive and electronegative electrodes.
The electropositive electrode may contain hydrogen gas in the form of a solid.
www.nuenergy.org /technology/perreault_radiant_energy_patent.htm   (1445 words)

 General Chemistry at Penn State: Tutorials   (Site not responding. Last check: 2007-10-21)
The real shapes of the molecules (both 2D and 3D) drawn at this stage are not established yet: any clear drawing will work.
BF connectivity implied by the name and formula; excluding hydrogens (which cannot be central anyway), the most electropositive atom is in the center
connectivity implied by the name and formula; the most electropositive atom is in the center
courses.chem.psu.edu /chem12/spring/tutorials/Lewis-struct.htm   (1890 words)

 Chemical Sciences: Stoichiometry: Principles of Chemical Nomenclature
Thus, you can tell that cesium (Cs) is very metallic because it is one of the left-most and lowest elements, while fluorine (F) is least electropositive because it is one of the right-most and highest elements; germanium (Ge) is more metallic than carbon (C) but less metallic than tin (Sn) or lead (Pb).
This was the original basis for the empirical Pauling scale of electronegativity, which expresses the same thing in quantitative numeric form, and so Pauling electronegativity values are often used to order elements when compounds are to be named.
The element with the greatest Pauling electronegativity value is the least metallic and the least electropositive.
www.ualberta.ca /~jplambec/che/p101/p01026.htm   (683 words)

 Archimedes Plutonium   (Site not responding. Last check: 2007-10-21)
Does not F and Cs when put together in a frozen state of near 0 Kelvin create a electric current without there ever administering a external electric field.
Look at the world record superconductor of the perovskite Ba-Y-Cu-F-O at 155 K. Basically all compound superconductors have electronegative atoms such as F and O. And they all have electropositive atoms such as Ba and Y. And of course they have atoms which I call conduction band atoms such as Cu.
The world's best superconductors are compounds with atoms from these 3 regions of the periodic chart of chemical elements: electropositive: Cs, Ba, Rb, Sr.
www.iw.net /~a_plutonium/File022e.html   (897 words)

 Chemistry at interfaces: Electropositive metals on polymer surfaces
The chemical nature of the interface formed when an electropositive metal (chromium or cesium) is deposited onto the surface of PMDA–ODA polyimide has been investigated using chemical model studies coupled with photoelectron spectroscopic techniques.
Results of these experiments show that chromium (and other electropositive metals studied so far) initially reacts rapidly with the carbonyl groups of polyimide, causing reduction of the dianhydride portion of the polymer, with concomitant chromium oxidation.
Continued deposition of chromium onto the reacted polymer surface results in the formation of chromium carbide, oxide, and nitride species, indicating a disruption of the polymer chemical structure.
domino.watson.ibm.com /tchjr/journalindex.nsf/0b9bc46ed06cbac1852565e6006fe1a0/482ed3040400aba585256bfa0067f718?OpenDocument   (209 words)

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