Calixarenes: Phenolic metacyclophanes derived from condensation of PHENOLS and ALDEHYDES. The name derives from the vase-like molecular structures. A bracketed [n] indicates the number of aromatic rings.Hydrocarbons, Acyclic: Organic compounds composed exclusively of carbon and hydrogen where no carbon atoms join to form a ring structure.Biocatalysis: The facilitation of biochemical reactions with the aid of naturally occurring catalysts such as ENZYMES.Lipase: An enzyme of the hydrolase class that catalyzes the reaction of triacylglycerol and water to yield diacylglycerol and a fatty acid anion. It is produced by glands on the tongue and by the pancreas and initiates the digestion of dietary fats. (From Dorland, 27th ed) EC 3.1.1.3.Macrocyclic Compounds: Cyclic compounds with a ring size of approximately 1-4 dozen atoms.Blogging: Using an INTERNET based personal journal which may consist of reflections, comments, and often hyperlinks.Animal Communication: Communication between animals involving the giving off by one individual of some chemical or physical signal, that, on being received by another, influences its behavior.Nobel PrizeReceptor, Cannabinoid, CB1: A subclass of cannabinoid receptor found primarily on central and peripheral NEURONS where it may play a role modulating NEUROTRANSMITTER release.History, 20th Century: Time period from 1901 through 2000 of the common era.Sex Attractants: Pheromones that elicit sexual attraction or mating behavior usually in members of the opposite sex in the same species.Pheromones: Chemical substances, excreted by an organism into the environment, that elicit behavioral or physiological responses from other organisms of the same species. Perception of these chemical signals may be olfactory or by contact.Melibiose: A disaccharide consisting of one galactose and one glucose moiety in an alpha (1-6) glycosidic linkage.Cations: Positively charged atoms, radicals or groups of atoms which travel to the cathode or negative pole during electrolysis.Cations, Divalent: Positively charged atoms, radicals or groups of atoms with a valence of plus 2, which travel to the cathode or negative pole during electrolysis.Recognition (Psychology): The knowledge or perception that someone or something present has been previously encountered.Cations, Monovalent: Positively charged atoms, radicals or group of atoms with a valence of plus 1, which travel to the cathode or negative pole during electrolysis.Molecular Sequence Data: Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories.Amino Acid Sequence: The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION.Models, Molecular: Models used experimentally or theoretically to study molecular shape, electronic properties, or interactions; includes analogous molecules, computer-generated graphics, and mechanical structures.Binding Sites: The parts of a macromolecule that directly participate in its specific combination with another molecule.Perylene: A 20-carbon dibenz(de,kl)anthracene that can be viewed as a naphthalene fused to a phenalene or as dinaphthalene. It is used as fluorescent lipid probe in the cytochemistry of membranes and is a polycyclic hydrocarbon pollutant in soil and water. Derivatives may be carcinogenic.Computer Security: Protective measures against unauthorized access to or interference with computer operating systems, telecommunications, or data structures, especially the modification, deletion, destruction, or release of data in computers. It includes methods of forestalling interference by computer viruses or so-called computer hackers aiming to compromise stored data.ImidesConfidentiality: The privacy of information and its protection against unauthorized disclosure.Privacy: The state of being free from intrusion or disturbance in one's private life or affairs. (Random House Unabridged Dictionary, 2d ed, 1993)Portal Vein: A short thick vein formed by union of the superior mesenteric vein and the splenic vein.Software: Sequential operating programs and data which instruct the functioning of a digital computer.Energy Transfer: The transfer of energy of a given form among different scales of motion. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed). It includes the transfer of kinetic energy and the transfer of chemical energy. The transfer of chemical energy from one molecule to another depends on proximity of molecules so it is often used as in techniques to measure distance such as the use of FORSTER RESONANCE ENERGY TRANSFER.Internet: A loose confederation of computer communication networks around the world. The networks that make up the Internet are connected through several backbone networks. The Internet grew out of the US Government ARPAnet project and was designed to facilitate information exchange.Organothiophosphorus Compounds: Compounds containing carbon-phosphorus bonds in which the phosphorus component is also bonded to one or more sulfur atoms. Many of these compounds function as CHOLINERGIC AGENTS and as INSECTICIDES.Chemical Warfare Agents: Chemicals that are used to cause the disturbance, disease, or death of humans during WARFARE.Games, Experimental: Games designed to provide information on hypotheses, policies, procedures, or strategies.Atlases as Topic: Collections of illustrative plates, charts, etc., usually with explanatory captions.Sarin: An organophosphorus ester compound that produces potent and irreversible inhibition of cholinesterase. It is toxic to the nervous system and is a chemical warfare agent.Poisons: Substances which, when ingested, inhaled, or absorbed, or when applied to, injected into, or developed within the body in relatively small amounts may, by their chemical action, cause damage to structure or disturbance of function. (From Dorland, 27th ed)Soman: An organophosphorus compound that inhibits cholinesterase. It causes seizures and has been used as a chemical warfare agent.Calcium: A basic element found in nearly all organized tissues. It is a member of the alkaline earth family of metals with the atomic symbol Ca, atomic number 20, and atomic weight 40. Calcium is the most abundant mineral in the body and combines with phosphorus to form calcium phosphate in the bones and teeth. It is essential for the normal functioning of nerves and muscles and plays a role in blood coagulation (as factor IV) and in many enzymatic processes.Phenylphosphonothioic Acid, 2-Ethyl 2-(4-Nitrophenyl) Ester: An organothiophosphorus cholinesterase inhibitor that is used as an insecticide and as a acaricide.

Sulphonic acid derivatives as probes of pore properties of volume-regulated anion channels in endothelial cells. (1/86)

1. We have used the whole-cell patch-clamp technique to study the effects of 4-sulphonic-calixarenes and some other poly-sulphonic acid agents, such as suramin and basilen blue, on volume-regulated anion channel (VRAC) currents in cultured endothelial cells (CPAE cells). 2. The 4-sulphonic-calixarenes induced a fast inhibition at positive potentials but were ineffective at negative potentials. At small positive potentials, 4-sulphonic-calix[4]arene was a more effective inhibitor than 4-sulphonic-calix[6]arene and -calix[8]arene, which became more effective at more positive potentials. 3. Also suramin and basilen blue induced a voltage dependent current inhibition, reaching a maximum around +40 mV and declining at more positive potentials. 4. The voltage dependence of inhibition was modelled by assuming that these negatively charged molecules bind to a site inside VRAC that senses a fraction delta of the applied electrical field, ranging beween 0.16 to 0.32. 4-Sulphonic-calix[4]arene, suramin and basilen blue bind and occlude VRAC at moderate potentials, but permeate the channel at more positive potentials. 4-Sulphonic-calix[6]arene and -calix[8]arene however do not permeate the channel. From the structural information of the calixarenes, we estimate a lower and upper limit of 11*12 and 17*12 A2 respectively for the cross-sectional area of the pore.  (+info)

Anatomy, physiology, and synaptic responses of rat layer V auditory cortical cells and effects of intracellular GABA(A) blockade. (2/86)

The varied extracortical targets of layer V make it an important site for cortical processing and output, which may be regulated by differences in the pyramidal neurons found there. Two populations of projection neurons, regular spiking (RS) and intrinsic bursting (IB), have been identified in layer V of some sensory cortices, and differences in their inhibitory inputs have been indirectly demonstrated. In this report, IB and RS cells were identified in rat auditory cortical slices, and differences in thalamocortical inhibition reaching RS and IB cells were demonstrated directly using intracellular GABA(A) blockers. Thalamocortical synaptic input to RS cells was always a combination of excitation and both GABA(A) and GABA(B) inhibition. Stimulation seldom triggered a suprathreshold response. IB cell synaptic responses were mostly excitatory, and stimulation usually triggered action potentials. This apparent difference was confirmed directly using intracellular chloride channel blockers. Before intracellular diffusion, synaptic responses were stable and similar to control conditions. Subsequently, GABA(A) was blocked, revealing a cell's total excitatory input. On GABA(A) blockade, RS cells responded to synaptic stimulation with large, suprathreshold excitatory events, indicating that excitation, while always present in these cells, is masked by GABA(A). In IB cells that had visible GABA(A) input, it often masked an excitatory postsynaptic potential (EPSP) that could lead to additional suprathreshold events. These findings indicate that IB cells receive less GABA(A)-mediated inhibitory input and are able to spike or burst in response to thalamocortical synaptic stimulation far more readily than RS cells. Such differences may have implications for the influence each cell type exerts on its postsynaptic targets.  (+info)

Permeabilization via the P2X7 purinoreceptor reveals the presence of a Ca2+-activated Cl- conductance in the apical membrane of murine tracheal epithelial cells. (3/86)

Calcium-activated Cl(-) secretion is an important modulator of regulated ion transport in murine airway epithelium and is mediated by an unidentified Ca(2+)-stimulated Cl(-) channel. We have transfected immortalized murine tracheal epithelial cells with the cDNA encoding the permeabilizing P2X(7) purinoreceptor (P2X(7)-R) to selectively permeabilize the basolateral membrane and thereby isolate the apical membrane Ca(2+)-activated Cl(-) current. In P2X(7)-R-permeabilized cells, we have demonstrated that UTP stimulates a Cl(-) current across the apical membrane of CF and normal murine tracheal epithelial cells. The magnitude of the UTP-stimulated current was significantly greater in CF than in normal cells. Ion substitution studies demonstrated that the current exhibited a permselectivity sequence of Cl(-) > I(-) > Br(-) > gluconate(-). We have also determined a rank order of potency for putative Cl(-) channel blockers: niflumic acid > or = 5-nitro-2-(3-phenylpropylamino)benzoic acid > 4, 4'-diisothiocyanostilbene-2,2'-disulfonate > glybenclamide >> diphenlyamine-2-carboxylate, tamoxifen, and p-tetra-sulfonato-tetra-methoxy-calix[4]arene. Complete characterization of this current and the corresponding single channel properties could lead to the development of a new therapy to correct the defective airway surface liquid in cystic fibrosis patients.  (+info)

Emergent mechanical properties of self-assembled polymeric capsules. (4/86)

Synthetic self-assembled systems combine responsiveness and reversibility with the ability to perform chemical tasks such as molecular recognition and catalysis. An unmet challenge is the construction of polymeric materials that, like nature's tubulin, are simultaneously reversible and capable of useful physical tasks. We report here a class of reversibly formed polymers that show covalent-polymer mechanical integrity in solution and in the solid state. Non-Newtonian, polymeric behavior is observed despite the low molecular weight of the individual subunits and the seemingly weak forces holding the assemblies together. These polymers assemble through self-complementary hydrogen bonding and by physical encapsulation of small molecules; accordingly, the emergent macroscopic structure and function can be controlled by appropriate chemical signals.  (+info)

An improved Na+-selective microelectrode for intracellular measurements in plant cells. (5/86)

The high background K+ concentration in plant cells is a problem for intracellular measurements of Na+ using ion-selective microelectrodes. The discrimination between Na+ and K+ of the microelectrode ionophore molecule limits the usefulness of this technique. A new Na+-selective microelectrode with an ionophore incorporating a tetramethoxyethyl ester derivative of p-t-butyl calix[4]arene has been developed. Microelectrodes made with this new sensor have superior selectivity for Na+ over K+ resulting in a lower limit of detection when compared with microelectrodes made using a commercially available ionophore (ETH227). Both types of microelectrodes were insensitive to changes in ionic strength and physiological ranges of pH, but only the calixarene-based electrodes showed no protein interference. To test the suitability of the calixarene-based microelectrodes for measurements in plants, they were used to measure Na+ in epidermal cells in the zone 10-20 mm from the root apex of barley (Hordeum vulgare L.). Seedlings were grown in a nutrient solution containing 200 mM NaCl for 1-6 d. The range of intracellular Na+ activity (a(Na)) measured varied from < or =0.1 mM (limit of detection) to over 100 mM, and these values increased significantly with time. The membrane potential (E(m)) of these cells was variable, but the values became significantly more negative with time, although there was no significant correlation between E(m) and a(Na). These intracellular measurements could not be separated into distinct populations that might be representative of subcellular compartments.  (+info)

Interchain hydrogen-bonding interactions may facilitate translocation of K+ ions across the potassium channel selectivity filter, as suggested by synthetic modeling chemistry. (6/86)

A 4-fold symmetric arrangement of TVGYG polypeptides forms the selectivity filter of the K+ channel from Streptomyces lividans (KcsA). We report the synthesis and properties of synthetic models for the filter, p-tert-butyl-calix[4]arene-(OCH(2)CO-XOBz)(4) (X = V, VG, VGY), 1-3. The first cation (Na+, K+) binds to the four -[OCH(2)CO]- units, a region devised to mimic the metal-binding site formed by the four T residues in KcsA. NMR studies reveal that cations and valine amide protons compete for the carbonyl oxygen atoms, converting NH(Val)...O=C hydrogen bonds to M+ ...O=C bonds (M+ = Na+ or K+). The strength of these interchain NH(Val)...O=C hydrogen bonds varies in the order 3 > 2 > 1. We propose that such interchain H-bonding may destabilize metal binding in the selectivity filter and thus help create the low energy barrier needed for rapid cation translocation.  (+info)

Facile formation of chiral calixarene analogs incorporating cystine peptide into the macrocyclic ring. (7/86)

Chiral calixarene analogs incorporating cystine peptide into their macrocyclic ring were easily prepared by the cyclization reactions of bis(chloromethyl)phenol-formaldehyde oligomers with cystine peptides in moderate yields. Circular dichroism (CD) spectra indicated the existence of the transmission of the chirality from peptide unit to phenol-formaldehyde oligomer moiety.  (+info)

Cytosine substituted calix[4]pyrroles: neutral receptors for 5'-guanosine monophosphate. (8/86)

The synthesis and characterization of two cytosine-substituted calix[4]pyrrole conjugates, bearing the appended cytosine attached at either a beta- or meso-pyrrolic position, is described. These systems were tested as nucleotide-selective carriers and as active components of nucleotide-sensing ion-selective electrodes at pH 6.6. Studies of carrier selectivity were made using a Pressman-type model membrane system consisting of an initial pH 6.0 aqueous phase, an intervening dichloromethane barrier containing the calix[4]pyrrole conjugate, and a receiving basic aqueous phase. Good selectivity for the Watson-Crick complementary nucleotide, 5'-guanosine monophosphate (5'-GMP), was seen in the case of the meso-linked conjugate with the relative rates of through-membrane transport being 7.7:4.1:1 for 5'-GMP, 5'-AMP, and 5'-CMP, respectively. By contrast, the beta-substituted conjugate, while showing a selectivity for 5'-GMP that was enhanced relative to unsubstituted calix[4]pyrrole, was found to transport 5'-CMP roughly 4.5 times more quickly than 5'-GMP. Higher selectivities were also found for 5'-CMP when both the beta- and meso-substituted conjugates were incorporated into polyvinyl chloride membranes and tested as ion selective electrodes at pH 6.6, whereas near-equal selectivities were observed for 5'-CMP and 5'-GMP in the case of unsubstituted calix[4]pyrroles. These seemingly disparate results are consistent with a picture wherein the meso-substituted cytosine calix[4]pyrrole conjugate, but not its beta-linked congener, is capable of acting as a ditopic receptor, binding concurrently both the phosphate anion and nucleobase portions of 5'-GMP to the calixpyrrole core and cytosine "tails" of the molecule, respectively, with the effect of this binding being most apparent under the conditions of the transport experiments.  (+info)

*Calixarene

The calixarene based on p-tert-butyl phenol is also a cone. Calixarenes are structurally related to the pillararenes. In 1872 ... Calixarenes have been used as the macrocycle portion of a rotaxane and two calixarene molecules covalently joined together by ... Some calixarenes are efficient sodium ionophores and are potentially useful in chemical sensors. Calixarenes are used in ... An accurate and detailed history of the calixarenes along with extensive discussion of calixarene chemistry can be found in the ...

*Colin Raston

Calixarenes resemble chalices (calix in Latin) with hydrophobic cavities that can hold smaller molecules or ions, an example of ... Calixarenes are the general category of macrocycle oligomers formed by hydroxyalkylation of a phenol and an aldehyde; ... Gutsche, C. D. (1989). Calixarenes. Cambridge: Royal Society of Chemistry. ISBN 085186385X. Atwood, J. L.; Barbour, L. J.; ...

*Wulff-Dötz reaction

Fernandes, Rodney; Mulay, Sandip (28 May 2014). "Chiral Cups (Calixarenes) via Dötz Benzannulation". Synthesis. 46 (14): 1836- ... such as calixarenes. The exact details of the Wulff-Dötz reaction are still being discussed and argued. The currently accepted ...

*Cavitand

Examples include cyclodextrins, calixarenes, pillararenes and cucurbiturils. Specific cavitands form the basis of rigid ...

*Timothy M. Swager

"Liquid Crystalline Calixarenes" pages 389-398. in Calixarenes 50th Anniversary: Commemorative Issue Vicens, J.; Asfari, Z.; ...

*Resorcinarene

... s are a type of calixarene. Resorcinarenes interact with other molecules forming a host-guest complex. ...

*Ionophore

Many synthetic ionophores are based on crown ethers, cryptands, and calixarenes. These synthetic species are often macrocyclic ...

*2,6-Dihydroxypyridine

2001). "A New Type of Calixarene: Octahydroxypyridine[4]arenes". Chemistry: A European Journal. 7 (2): 465-474. doi:10.1002/ ...

*Synthetic ion channels

Ion channels containing calixarenes of ring size 3 and 4 have both been reported. For calix[4]arene, two conformations are ...

*Thiacalixarene

Calixarenes are difficult to separate because it is all too easy to end up with complex mixtures of linear and cyclic oligomers ... Thiacalixarenes, like calixarene are characterised by a three-dimensional basket (vase or chalice shape). In thiacalix[4]arene ... The word thiacalixarene is derived from thia (as sulfur) and calixarene. Thiacalixarenes have hydrophobic cavities that can ...

*Alexander Butlerov Chemistry Institute

The Department conducts research in the following fields: thio-phosphorylated derivatives of resorcinols and calixarenes; ... "Calixarene Chemistry", "Phosphorus-Containing Analogues of Natural Compounds", "Chemistry of Heterocyclic Compounds" and many ...

*Cucurbituril

CB[10] is large enough to hold other molecular hosts such as a calixarene molecule. With a calixarene guest different chemical ... Allosteric control is provided when an adamantane molecule forces a cone conformation with a calixarene - adamantane inclusion ... calixarenes, and pillararenes. Cucurbiturils are amidals (less precisely aminals) and synthesized from urea 1 and a dialdehyde ...

*Chirality (chemistry)

Examples include 1-bromo-3-chloro-5-fluoroadamantane, methylethylphenyltetrahedrane, certain calixarenes and fullerenes, which ...

*Scanning probe lithography

"Nanolithography by scanning probes on calixarene molecular glass resist using mix-and-match lithography". Journal of Micro/ ...

*Artificial enzyme

Classically artificial enzymes bind substrates using receptors such as cyclodextrin, crown ethers, and calixarene. Artificial ...

*Pillararene

They are structurally similar to the cucurbiturils and calixarenes that play an important part in host-guest chemistry. The ...

*Host-guest chemistry

Common host molecules are cyclodextrins, calixarenes, pillararenes, cucurbiturils, porphyrins, metallacrowns, crown ethers, ...

*Norbadione A

It selectively complexes cesium cations (Cs+), with an efficiency comparable to that of some calixarenes or crown ethers. It ...

*Supramolecular chemistry

Cyclodextrins, calixarenes, cucurbiturils and crown ethers are readily synthesized in large quantities, and are therefore ...

*Clathrate compound

More recently, the term refers to many molecular hosts, including calixarenes and cyclodextrins and even some inorganic ...

*Circulene

... compare to cones and partial cones in calixarenes). Conceptually related compounds are the helicenes. The isolation of ...

*Carcerand

This is accomplished by dynamic covalent chemistry in a one-pot condensation of 6 equivalents of a tetraformyl calixarene and ... The first generation carcerands are based on calixarene hemicarcerands with 4 alkyl substituents on the upper rim and 4 ...

*Inherent chirality

The expression "inherently chiral" was first used by Boehmer to describe calixarenes with XXYZ or WXYZ substitution patterns at ...

*Phenols

... for example synthesis of calixarenes Reaction of naphtols and hydrazines and sodium bisulfite in the Bucherer carbazole ...

*Cyclotriveratrylene

The compound is related to calixarenes in terms of its host-guest properties and its synthesis CTV derivates are known to bind ...
Our Viewpoints focus the spotlight on significant impacts and breakthroughs resulting from ChemComm articles in the last century, and can serve as catalysts for active discussion and inspiration within the community.. Earlier this year, Jack Harrowfields Viewpoint focussing on the 1985 contribution of Tony McKerveys group to the field of calixarenes and cations generated an enthusiastic response, including suggestions on other articles that were also felt to have played a seminal role in calixarene chemistry. As a result, we have recently published an alternative Viewpoint by Alessandro Casnati on the impact of Communications published (in 1983 and 1984) by the group of Rocco Ungaro and Andrea Pochini.. Read both Viewpoints now and see the impact these groundbreaking Comms created:. ...
Calixarenes bear a fascinating class of macrocycles that have served broadly in molecular recognition and supramolecular chemistry. These, supramolecular structures have been utilized in several different directions ranging from catalysis to therapy.
Calix[4]tetra-diazonium cations generated in situ from the corresponding tetra-anilines were electrografted on gold and carbon substrates. The well-preorganized macrocyclic structure of the calix[4]arene molecules allows the formation of densely packed monolayers. Through adequate decoration of the small rim of the calixarenes, functional molecules can then be introduced on the immobilized calixarene subunits, paving the way for an accurate spatial control of the chemical composition of a surface at molecular level." One cool experiment is determination of surface coverage by functionalizing the electrode with COOH terminated calixarenes and then coupling on Fc moieties and doing CV ...
Authors: MUSTAFA YILMAZ, SERKAN ERDEMİR Abstract: Calixarene-based molecular receptors have been a widely developing area in material science and technology for the last few decades. Due to their bowl-shaped geometry, calixarene macrocycles are used as hosts allowing organic and inorganic guests to coordinate/sorb onto their cavity. This work briefly reviews the recent development of calixarenes. Keywords: Calixarene, receptor, host-guest, drugs, chiral, lipase Full Text: PDF ...
ENGLISH ABSTRACT: Resorcinarenes are macrocyclic products formed from the condensation of aldehydes (aliphatic or aromatic) and resorcinol and have been used in a wide range of applications since their first synthesis. Applications include: HPLC stationary phases for the separation of pyrimidine bases, racemic drugs and isomers, the selective extractions of lanthanides and actinides, as molecular receptors, catalysis, NMR chiral shift agents, GC separations and as starting materials for the synthesis of macrocyclic compounds (e.g. cavitands and carcerands) to name but a few. The use of resorcinarenes in catalysis is still quite new and unexplored, while catalysis using calix[4]arenes, a related macrocycle, has been widely studied. In this thesis it was attempted to synthesise a C2v symmetric resorcinarene precursor that could be further functionalised to form distal bidentate ligands for coordination to transition metals. These compounds would then ultimately be used in catalytic testing, ...
On 13th February 2017, the half-brother of the North-Korean dictator Kim Jong-un was poisoned, supposedly with one of the deadliest known chemicals, namely, the nerve agent VX (O-ethyl S- methylphosphonothioate). This poison is so effective that contamination of the skin with only ca.
Following an introduction on calixarene chemistry and their metal-ion complexes including some of their applications, the aim of the work are described. Thus this thesis concentrates on the synthesis and characterisation of two new lower rim calix(4)arene derivatives containing mixed pendent arms as well as an investigation on the solution properties of their metal-ion complexes. Macrocycles namely, 5, 11, 17, 23 tetrakis (1, 1 dimethylethyl) 25, 27- bis [(2-methylthio) ethoxy] 26, 28-bis [2- pyridyl methyloxy] calix(4)arene, L1 and 5, 11, 17, 23 tetrakis (1, 1 dimethylethyl) 25, 27- bis [(2- methylthio) ethoxy] 26, 28-bis [3-pyridyl methyloxy] calix(4)arene, L2, are structurally (1H NMR and X-ray crystallography) and thermodynamically (solubility, Gibbs energy, enthalpy and entropy) characterised. The complexing ability of these ligands for metal cations is investigated using a variety of techniques. Solubility measurements and derived standard transfer Gibbs energies of these isomers indicate ...
In this work the applicability of calix[6]arene columns for actinides analysis in urine samples and drinking water was investigated. A radiochemical procedure has been developed for U, Pu, Am analysis in urine. A simple and effective method has also been proposed on a specific column named AQUALIX, for the separation and preconcentration of U from drinking water. These procedures are suitable for routine analysis and require a considerably reduced number of steps of sample treatment as compared to current procedures ...
In supramolecular chemistry, host-guest chemistry describes complexes that are composed of two or more molecules or ions that are held together in unique structural relationships by forces other than those of full covalent bonds. Host-guest chemistry encompasses the idea of molecular recognition and interactions through noncovalent bonding. Noncovalent bonding is critical in maintaining the 3D structure of large molecules, such as proteins and is involved in many biological processes in which large molecules bind specifically but transiently to one another. There are four commonly mentioned types of non-covalent interactions: hydrogen bonds, ionic bonds, van der Waals forces, and hydrophobic interactions. Common host molecules are cyclodextrins, calixarenes, pillararenes, cucurbiturils, porphyrins, metallacrowns, crown ethers, zeolites, cyclotriveratrylenes, cryptophanes, carcerands, and foldamers. Host-guest chemistry is observed in inclusion compounds, Intercalation compounds, clathrates, and ...
Functionalizing the upper rim of resorcinarene-based cavitands allows a variety of compounds to be synthesized from a single scaffold. Using the upper-rim moieties as ligands for a variety of transition metal ions further increases the versatility of this class of host compounds. A new resorcinarene-based molecule functionalized with four pyridine and acetic acid ligands has been successfully prepared to explore the properties of metal-assembled complexes. To synthesize this compound, tetra(bromomethyl)cavitand was reacted with N-(2-pyridylmethyl)-N-ethylacetate amine to give ethyl acetate pyridine resorcinarene. Hydrolysis of the ester gave acetic acid pyridine resorcinarene (APRes) in good yield. Complexes with Cu2+, Co2+, and Zn2+ are currently being investigated and characterized by MS and 1H and 13C NMR.
We are interested in all aspects of coordination, organometallic and metallo-supramolecular chemistry with a particular emphasis upon the synthesis of cavity-shaped ligands and their use in organometallic catalysis and green chemistry. Much of our work relies on macrocyclic molecules, such as calixarenes, resorcinarenes, and cyclodextrins. The latter may be used as receptors or serve as platforms for the construction of multifunctional podands.. ...
This invention describes a new concept of flexible template-directed microporous partially pyrolyzed polymeric membranes which have greatly improved performance in separation of gas pairs compared to their precursor polymeric membranes. Organic hosts, such as crown ethers, cyclodextrins (CDs), calixarenes (CXs), and spherands, or polymeric additives, such as poly(ethylene glycol) (PEG) and polyvinylpyrrolidone (PVP) were used as the micropore-forming templates. Micropore-forming template/polymer blend membranes comprising organic micropore-forming templates embedded in a polymer matrix were prepared by dissolving the organic micropore-forming templates in the polymer solution followed by solution-casting and solvent evaporation or solvent exchange. Low-temperature selectively pyrolyzing micropore-forming templates in the micropore-forming template/polymer blend membranes at a nitrogen flow resulted in the formation of flexible microporous partially pyrolyzed polymeric membranes.
Importantly, many of the techniques we use to characterize these materials are frequently used throughout organic chemistry and include NMR, UV-Vis spectroscopy, cyclic voltammetry, and IR spectroscopy. These are all excellent techniques students may add to their organic chemistry resume, which will help prepare them for a multitude of potential career paths Advanced Time-Correlated Single Photon Counting Techniques (Springer Series in Chemical Physics) http://detroitpaintandglass.com/?lib/advanced-time-correlated-single-photon-counting-techniques-springer-series-in-chemical-physics. Martin na Muri (Croatia) during September 3-7, 2016 ref.: Calixarenes 2001 read pdf eatdrinkitaly.org. More information on these and other projects can be found on Prof. A complete publication list is available from Professor Herberts research web page. Some representative publications from the last few years are listed here. Low-scaling quantum chemistry approach to excited-state properties via an ab initio ...
All four hydrogens can be moved in a single step, one might move two at a time in two steps, or one might move one at a time in four steps. These processes would involve respectively 8, 6 or 4 electrons in each step. There is a fundamental difference between the first pathway and the last two; the latter involve ionic intermediates (zwitterions) whereas the first is neutral. As such one might imagine the process would depend on the ability of the solvent to stabilize any such zwitterion.. Let us start with a gas phase model (ωB97XD/6-311G(d,p)), and a transition state with one negative force constant is indeed found with C4v symmetry. The free energy barrier ΔG† for the process is 14.0 kcal/mol, which means the reaction will occur rapidly, even at lower temperatures of ~200K. A pack size of 8 seems preferred for this model. This is hardly a surprise since the formation of ionic intermediates would not be expected. One might however speculate thus. In the schematic above, n=1 and one might be ...
GFB-204 is a calixarene derivative that is a potent and selective inhibitor of VEGFR and PDGFR tyrosine phosphorylation. G FB-204 had been shown through several in-vivo and in-vitro studies to bind to VEGF and PDGF, block binding of VEGF and PDGF to their receptors and subsequently inhibit Flk-1 and PDGFR tyrosine phosphorylation and stimulation of the protein kinases Erk1, Erk2, and AKT and the signal transducer and activator of transcription STAT3. Since tumor angiogenesis depends on VEGF for initiation and PDGF for maintenance of blood vessels, an agent which suppresses the functions of both VEGF and PDGF would potentially be more effective in tumor control that an agent which targets only one of these two growth factors. Preclinical studies have also shown that GFB-204 inhibits capillary network formation in a dose-response manner and inhibits VEGF-dependent human brain endothelial cell migration. A lung xenograft study in mice has shown that GFB-204 is active in a dose dependent manner.
Calixarene-Based Molecules for Cation Recognition. . Biblioteca virtual para leer y descargar libros, documentos, trabajos y tesis universitarias en PDF. Material universiario, documentación y tareas realizadas por universitarios en nuestra biblioteca. Para descargar gratis y para leer online.
The thesis deals with an investigation on calix[4] based receptors, namely calix[4]pyrrole and calix[4]arene derivatives and their use in different environmental and medical applications. The work conducted throughout this study addresses three main topics. i) The first topic discusses the ability of meso-octamethylcalix[4]pyrrole, CP to remove arsenite and arsenate anions from natural waters. Sites and nature of interaction of the receptor with the investigated anions using 1H NMR and molecular simulation studies are identified. Optimal environmental conditions led to maximal uptake of the investigated anions by CP, uptake capacity of the receptor and the kinetics of the process for the investigated anions are determined. CP was used to remove arsenic species from real water samples and its efficiency is demonstrated. ii) The second topic is related to the synthesis and structural characterisation of two thioacetamide calix[4]pyrrole derivatives namely, ...
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This doctoral thesis deals with the synthesis and binding studies of novel receptors based on aryl-extended calix[4]pyrrole scaffolds. Specifically, we describe a new synthetic methodology for the synthesis of water-soluble aryl-extended calix[4]pyrrole functionalized with water solubilizing groups distal to the binding site. This strategy avoids possible perturbation during the complex formation and permits the future construction of more elaborated receptors. We report the binding studies of these new water-soluble receptors with a series of pyridine N-oxides derivatives in water. The results obtained highlighted the ability of the aromatic cavity to protect and ensure the formation of hydrogen-bonding interactions in water. We also describe the synthesis of a new monophosphonate receptor for the selective recognition of neutral creatinine and creatininium cation in organic solution. Our studies demonstrate that the new monophosphonate receptor is able to form complexes with creatinine and ...
We introduce bis-aryl croconamides as a new member in the family of dual hydrogen bonding anion receptors. In this study a series of croconamides are synthesised, and the selectivity for anion binding is investigated (Cl− | Br− | I− in CH2Cl2). The croconamides exhibit different structures in the crystal pha
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Understanding molecular recognition is central to many chemical processes such as in the development of drugs, receptors, sensors, catalysts and supramolecular materials. Over the years we have been particularly interested in designing molecular receptors for the purpose of separating, sensing, synthesizing or hydrolyzing biologically important compounds. Some of our current interests include (a) cation and anion recognition, (b) chiral receptors and catalysts for stereoselective separation and synthesis of biological compounds like amino acids and other chemical intermediates, (c) stereoselective synthesis of 1,2-diamines, (d) DNA base recognition with metal complexes and (e) mono and multinuclear metal complexes for catalyzing the hydrolysis and synthesis of nucleic acids and proteins. While some of our projects may at first appear unrelated, understanding one is useful for understanding others. For example, understanding anion recognition is not only useful for sensing fluoride but also for ...
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Instructions for Making a Nut Sheller From the Full Belly Project The stator is the concrete piece that makes up the outside of the machine and does not turn. Stator Mold Set 1. Outer Stator Mold 2. Smooth the inside edges by scraping the upper rim with a flat metal object. 16 ...
Stable π-dimers are formed upon oxidation of the model units of proposed calix[4]arene-based molecular actuators in a solvent of low dielectric constant ...
TTYH1, 0.1 mg. TTYH1 is a member of the tweety family of proteins, a family of chloride anion channels containing five transmembrane regions.
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In XSA-133, which is the Xen Security Advisory that provides details related to this vulnerability, it states that "Systems running only x86 PV guests are not vulnerable". This vulnerability applies to QEMU guests on KVM and XEN HVM Guests. Linode only uses XEN PV guests which are not affected by this vulnerability. Specifically, XEN PV guests do not require the use of QEMU.. ...
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ARhiSi combined analysis of ARhiSi-1 and ARhiSi-2: responder (healed or improved) to treatment from visit 2 (day 3) to visit 5 (day 14) (FAS, full analysis set;
The 4-amino-1,8-naphthalimide-based anion receptor 3 binds dihydrogenphosphate with 1:1 stoichiometry through cooperative hydrogen bonding to a naphthalimide N-H and thiourea N-H groups. This was clearly established from 1H NMR titration experiments in DMSO-d6 where a substantial shift in the resonance for the naphthalimide N-H was observed concomitant with the expected thiourea N-H chemical shift migration upon successive additions of H2PO4−. However, whilst 1H NMR titration experiments indicate that 3 was capable of binding other anions such as acetate, the naphthalimide N-H does not participate and the N-H resonance was essentially invariant during the titration. The lack of cooperative binding in this instance was justifiable on steric grounds ...
A modified calix[4]pyrrole, namely meso-tetramethyl-tetrakis-(4-hydroxyphenyl) calix[4]pyrrole, 1, has been synthesized and characterized. (1)H NMR investigations in various deuterated solvents seems to indicate that this receptor interacts with acetone-d(6). The solution thermodynamics of 1 in various solvents is reported. Complexation studies in CD(3)CN show that the NH and OH functionalities of 1 are the active sites of its interaction with the fluoride and the dihydrogen phosphate anions. The composition of the anion complexes was established through conductance measurements. In all cases, 1:1 complexes are formed. The thermodynamics of anion complexation in acetonitrile and N,N-dimethylformamide is discussed comparatively with previous reported data for the parent calix[4]pyrrole, 2, and these anions in these solvents. The medium effect on anion complexation is discussed in terms of the solvation properties of the reactants and the product in acetonitrile and N,N-dimethylformamide. An oligomeric
0053] A solvent useful in the present invention is a non-aqueous, aprotic, polar organic substance which dissolves the solute. Blends of more than one solvent may be used. Generally, solvents may be carbonates, carboxylates, lactones, phosphates, five or six member heterocyclic ring compounds, and organic compounds having at least one C1-C4 group connected through an oxygen atom to a carbon. Lactones may be methylated, ethylated and/or propylated. Generally, the electrolytic solution comprises at least one solute dissolved in at least one solvent. Useful solvents that can be made for the present invention include ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate (DPC), dibutyl carbonate (DBC), ethyl methyl carbonate (EMC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), tetrahydrofuran, 2methyl tetrahydrofuran, 1,3-dioxolane, 1,4-dioxane, 1,2-dimethoxyethane, 1,2-diethoxyethane, ...
Three calix[4]arene (Cal-4) derivatives which separately contain ethylester (1), carboxylic acid (2), and crownether (3) at the lower rim with a common reactive thiol at the upper rim were synthesized and constructed to self-assembled monolayers (SAMs) on Au films. After spectroscopic characterization of the monolayers, surface coverage and orientation of antibody immobilized on the Cal-4 derivative SAMs were studied by surface plasmon resonance (SPR) technique. Experimental results revealed that the antibody could be immobilized on the Cal-4 derivatives spontaneously. The orientation of absorbed antibody on the Cal-4 derivative SAMs is related to the SAMs dipole moment. The possible orientations of the antibody immobilized on the Cal-4 derivative 1 SAM are lying-on or side-on, while on the Cal-4 derivative 2 and Cal-4 derivative 3 head-on and end-on respectively. These experimental results demonstrate the surface dipole moment of Cal-4 derivative appears to be an important factor to antibody
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Close The Infona portal uses cookies, i.e. strings of text saved by a browser on the users device. The portal can access those files and use them to remember the users data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser. ...
Two new near-infrared chemodosimeters for cyanide anion based on 5,10-dihexyl-5,10-dihydrophenazine were designed and synthesized. With dicyano-vinyl groups as the recognition site and electron-withdrawing groups on both sides, probe 1 exhibited an intramolecular charge transfer (ICT) absorption band at 545 nm and emission band at 730 nm, respectively, and thus showed an ICT block process and realized an on-off" response after bilateral reaction with cyanide anions in CH3CN. Probe 2 utilized an unreactive formyl group instead of one of the two reactive dicyano-vinyl groups as the electron-withdrawing component. Due to the unilateral recognition process the ICT of probe 2 was redirected and lead to a remarkably colorimetric and ratiometric near-infrared (NIR) fluorescent response for cyanine. Both probes provided high sensitivity and selectivity with apparent response signals which can be observed by naked eyes, even in the copresence of various other interference anions. Optical spectroscopic ...
The binding properties of bis(imidazolium) hosts 1a-c derived from amino acids towards different anions have been studied by 1H NMR titration experiments in 95 : 05 CD3CN : H2O at 303 K, ESI-MS and theoretical calculations. Among this family, the salt 1c showed a strong and high selectivity for chloride anions. Transmembrane chloride transport activity has also been studied for the three bis(imidazolium) based transporters in POPC liposome models, and compound 1a was identified as an active chloride/nitrate exchanger ...
The binding properties of bis(imidazolium) hosts 1a-c derived from amino acids towards different anions have been studied by 1H NMR titration experiments in 95 : 05 CD3CN : H2O at 303 K, ESI-MS and theoretical calculations. Among this family, the salt 1c showed a strong and high selectivity for chloride anions. Transmembrane chloride transport activity has also been studied for the three bis(imidazolium) based transporters in POPC liposome models, and compound 1a was identified as an active chloride/nitrate exchanger ...
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The growing antibiotic resistance phenomenon continues to stimulate the search for new compounds and strategies to combat bacterial infections. In this study, we designed and synthesized a new polycationic macrocyclic compound (2) bearing four N-methyldiethanol ammonium groups clustered and circularly organized by
Close The Infona portal uses cookies, i.e. strings of text saved by a browser on the users device. The portal can access those files and use them to remember the users data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser. ...
A device for collecting, testing and transporting a liquid specimen of urine or the like incorporates a cup or container and a cooperating lid which becomes sealed about its upper rim when the lid is mated with the specimen-containing cup. An upwardly open subchamber of defined volume, formed in the bottom wall of the cup, is sealed by engagement with a downwardly extending hollow plug portion of the lid that has a bottom wall containing a central aperture closed by a frangible sheet material seal. When initial testing is to be conducted, an elongated assay cartridge is inserted vertically downward through the hollow plug. The bottom end splits open the frangible seal and enters into the subchamber containing the defined volume of the liquid sample, which becomes totally absorbed by a pair of elongated nitrocellulose strips, along which the liquid moves by capillary action to effect the assay tests.
An injection blow-molded disposable tumbler is formed from a polymeric material and includes a fortified upper rim having a thickness greater than the adjacent sidewall. The tumbler may be formed of a variety of resinous materials and exhibits improved toughness and crush resistance as well as aesthetic qualities particulary desired by consumers.
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Duff, Thomas and Grüßing, André and Thomas, Jean-Luc and Duati, Marco and Vos, Johannes G. (2003) Luminescent anion recognition: Probing the interaction between dihydrogenphosphate anions and Ru(II) polypyridyl complexes in organic and aqueous media. Polyhedron, 22 (5). pp. 775-780. ISSN 0277-5387 ...
Abstract] The ditopic receptor L3 [1-(2-((7-(4-(tert-butyl)benzyl)-1,4,7,10-tetraazacyclododecan-1-yl)methyl)phenyl)-3-(3-nitrophenyl)urea] containing a macrocyclic cyclen unit for Cu(II)-coordination and a urea moiety ...
I was tidying up a guest room today because previous guests have gone and new ones are arriving on Monday. I was thinking about how much I enjoy having guests...and about guest rooms in general, and what they shoud have in them. (Not a cat! Begone,
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On Mon, 03 Aug 2009 16:33:32 -0500 Mark Allums ,[email protected], wrote: , Chris wrote: , , On Monday 03 August 2009, [email protected] wrote: , ,, Chris wrote: , ,,, I am trying to get Screen resize and Seamless mode working on , ,,, Lenny guest systems to no avail. , ,,, , ,,, I have tried insalling the guest-utils packages, as well as the , ,,, guest-additions the manual way with m-a. They install fine, but , ,,, sreen-resize and seamless mode dont work. , ,,, , ,,, Does anyone have this working at all? Ive tried various , ,,, xorg.conf files with the video driver and no screen resolutions. , ,,, , ,,, I am running virtualbox-ose 2.1.4 from lenny-backports on the , ,,, host. , ,,, , ,,, Thanks, , ,,, , ,,, Chris , ,, I also have same problem. , ,, I have Debian Sid LXDE, Debian Sid XFCE and Debian Sid KDE as a , ,, guest. They were first Lenny and screen size was to big so I was , ,, edit xorg.conf and it was fine. After upgrade to Sid all of them , ,, have to small screen with black frame ...
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0094] Typical examples of the positive charge control agent include a nigrosine dye such as NIGROSINE BASE EX (produced by Orient Chemical Industries Ltd.; a quaternary ammonium salt such as Quaternary Ammonium Salt P-51 (produced by Orient Chemical Industries Ltd.) or COPY CHARGE PX VP435 (produced by Hoechst Japan Co., Ltd.); and an imidazole compound such as alkoxylated amine, alkylamide, molybdic acid chelate pigment or PLZ-1001 (produced by Shikoku Chemicals Corp.). Typical examples of the negative charge control agent include a metal complex such as BONTRON S-22 (produced by Orient Chemical Industries Ltd.), BONTRON S-34 (produced by Orient Chemical Industries Ltd.), BONTRON E-81 (produced by Orient Chemical Industries Ltd.), BONTRON E-84 (produced by Orient Chemical Industries Ltd.) or SPILON BLACK TRH (produced by Hodogaya Chemical Co., Ltd.); a thioindigo pigment; a quaternary ammonium salt such as COPY CHARGE NX VP434 (produced by Hoechst Japan Co., Ltd.); a calixarene compound such as ...
The influenza M2 protein not only forms a proton channel but also mediates membrane scission in a cholesterol-dependent manner to cause virus budding and release. The atomic interaction of cholesterol with M2, as with most eukaryotic membrane proteins, has long been elusive. We have now determined the cholesterol-binding site of the M2 protein in phospholipid bilayers using solid-state NMR spectroscopy. Chain-fluorinated cholesterol was used to measure cholesterol proximity to M2 while sterol-deuterated cholesterol was used to measure bound-cholesterol orientation in lipid bilayers. Carbon-fluorine distance measurements show that at a cholesterol concentration of 17 mol%, two cholesterol molecules bind each M2 tetramer. Cholesterol binds the C-terminal transmembrane (TM) residues, near an amphipathic helix, without requiring a cholesterol recognition sequence motif. Deuterium NMR spectra indicate that bound cholesterol is approximately parallel to the bilayer normal, with the rough face of the sterol
The benzoin condensation is a reaction (often called a condensation reaction, for historical reasons) between two aromatic aldehydes, particularly benzaldehyde. The reaction is catalyzed by a nucleophile such as the cyanide anion or an N-heterocyclic carbene. The reaction product is an aromatic acyloin with benzoin as the parent compound. An early version of the reaction was developed in 1832 by Justus von Liebig and Friedrich Woehler during their research on bitter almond oil. The catalytic version of the reaction was developed by Nikolay Zinin in the late 1830s, and the reaction mechanism for this organic reaction was proposed in 1903 by A. J. Lapworth. In the first step in this reaction, the cyanide anion (as sodium cyanide) reacts with the aldehyde in a nucleophilic addition. Rearrangement of the intermediate results in polarity reversal of the carbonyl group, which then adds to the second carbonyl group in a second nucleophilic addition. Proton transfer and elimination of the cyanide ion ...
TY - JOUR. T1 - A dipyrenyl calixazacrown chemosensor for Mg2+ AU - Hamdi, Abdelwaheb. AU - Kim, Sang Hoon. AU - Abidi, Rym. AU - Thuéry, Pierre. AU - Kim, Jong Seung. AU - Vicens, Jacques. PY - 2009/4/4. Y1 - 2009/4/4. N2 - A new fluorogenic calix[4]tetraaza-crown-6 (4) bearing two pyrene amide groups has been prepared. It was shown to be selective for Mg2+. When Mg2+ is bound to 4, the pyrene monomer emission increased while the excimer emission declined in a ratiometric manner. It is shown by 1H NMR that this ratiometric change is due to the conformational changes of the pyrenes during the chelation of Mg2+ by the amide functions to form a 1:1 complex.. AB - A new fluorogenic calix[4]tetraaza-crown-6 (4) bearing two pyrene amide groups has been prepared. It was shown to be selective for Mg2+. When Mg2+ is bound to 4, the pyrene monomer emission increased while the excimer emission declined in a ratiometric manner. It is shown by 1H NMR that this ratiometric change is due to the ...
JC: Split between my principle investigator Moon Nahm and my program director Robin Lorenz. Moon has worked hard in helping shape me into the scientist I am today. Robin has been very important in helping me get through the hard parts and providing a model in how to run an academic program.. GS: What is your motivation in your academics/research? ...
JC: Split between my principle investigator Moon Nahm and my program director Robin Lorenz. Moon has worked hard in helping shape me into the scientist I am today. Robin has been very important in helping me get through the hard parts and providing a model in how to run an academic program.. GS: What is your motivation in your academics/research? ...
The protein encoded by this gene is a transmembrane glycoprotein that transports chloride ions across the cell membrane in exchange for bicarbonate ions. It is localized to the mucosa of the lower intestinal tract, particularly to the apical membrane of columnar epithelium and some goblet cells. The protein is essential for intestinal chloride absorption, and mutations in this gene have been associated with congenital chloride diarrhea. [provided by RefSeq, Oct 2008 ...
Benković, Tomislav and Tomišić, Vladislav and Frkanec, Leo and Galić, Nives (2012) ESI MS/MS Study of Calix[4]arene Derivatives and their Metal Complexes. Croatica Chemica Acta, 85 (4). pp. 469-477. ISSN 0011-1643 Cindrić, Marina and Rubčić, Mirta (2012) The Rare Examples of Thiosemicarbazonato Chromium(III) Complexes: Crystal Structures of [Cr(Hsal 4-Metsc)2]ClCH3OH and [Cr(Hsal 4-Phtsc)2]Cl. Croatica Chemica Acta, 85 (4). pp. 505-513. ISSN 0011-1643 Friščić, Tomislav and Halasz, Ivan and Štrukil, Vjekoslav and Eckert-Maksić, Mirjana and Dinnebier, Robert E. (2012) Clean and Efficient Synthesis Using Mechanochemistry: Coordination Polymers, Metal-Organic Frameworks and Metallodrugs. Croatica Chemica Acta, 85 (3). pp. 367-378. ISSN 0011-1643 Glunčić, Matko and Rosandić, Marija and Jelovina, Denis and Dekanić, Krešimir and Vlahović, Ines and Paar, Vladimir (2012) Global Repeat Map Method for Higher Order Repeat Alpha Satellites in Human and Chimpanzee Genomes (Build 37.2 ...
see article for more reactions. Abstract. A mild, convenient, fast, and nonreductive deiodination is reported for ortho-iodo-hydroxylated arenes using pyridine, triethylamine, and N-methylmorpholine in the presence of water. The regioselectivity is discussed.. ...
Positively charged cations and negatively charged anions attract one another. Conversely, cations repel one another as do anions.. Electrostatic attraction is indiscriminate. That is a cation can attract more than one anion and visa versa. The result is that cation-anions attractions form a large array that we call an ionic compound or salt. The bonds holding these ions together are called ionic bonds. However, this array has a very specific composition completely dictated by the charges on the cations and anions.. Formulas of ionic compounds:. The composition of ionic compounds is determined by the requirement that the compounds must be electrically neutral. That is that the charges of the cations and anions must balance or cancel out one another. For example consider sodium cations (Na+) and Chlorine anions (Cl ). Sodium has a positive 1 charge and chloride has a negative 1 charge. Thus one sodium cation cancels one chloride anion (+1 + 1 = 0) resulting in the formula Na1Cl1 or NaCl. ...
Pyrrole nucleus is one of the most important heterocycles abundantly found in bioactive natural molecules, forming the characteristic subunit of heme, chloroph...
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Sigma-Aldrich offers abstracts and full-text articles by [Joseph M Keane, Mahendra D Chordia, Christopher J Mocella, Michal Sabat, Carl O Trindle, W Dean Harman].
What is described is a compound of formula I wherein X is an ethene, or an unsubstitiited or substituted arene or heteroarene; Y is a bond, an ethene, or an unsubstituted or substituted arene or heteroarene; Z is S or O; L is a linear or ...
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V. V. Gorbatchuk, A. G. Tsifarkin, I. S. Antipin, B. N. Solomonov, A. I. Konovalov, Estimation of Free Energy of Supramolecular Effect at Host - Guest Complex Formation between Solid tert-Butylcalix[4]arene and Vapors of Organic Compounds // J. Inclusion Phenomena Macrocyclic Chem. - 1999. - V. 35, 1/2.- P.389-396 ...
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The synthesis and anion binding properties of novel halogen-bonding (XB) bis-iodotriazole-pyridinium-containing acyclic and {[}2]catenane anion host systems are described. The XB acyclic receptor displays selectivity for acetate over halides with enhanced anion recognition properties compared to the analogous hydrogen-bonding (HB) acyclic receptor. A reversal in halide selectivity is observed in the XB {[}2]catenane, in comparison to the acyclic XB receptor, due to the interlocked hosts unique three-dimensional binding cavity, and no binding is observed for oxoanions. Notable halide anion association constant values determined for the {[}2]catenane in competitive organicaqueous solvent mixtures demonstrate considerable enhancement of anion recognition as compared to the HB catenane analogue. X-ray crystallographic analysis of a series of halide catenane complexes reveal strong XB interactions in the solid state. These interactions were studied using Cl and Br K-edge X-ray Absorption Spectroscopy ...
This technical report describes progress on the DOE sponsored project "New Horizons in C-F Activation by Main Group Electrophiles" during the period of 09/15/2010 - 08/31/2015. The main goal of this project was to develop improved catalysts for conversion of carbon-fluorine bonds in potentially harmful compounds. The approach involved combining of a highly reactive positively charged main-group compound with a highly unreactive negatively charged species (anions) as a way to access potent catalysts for carbon-fluorine bond activation. This report details progress made in improving synthetic pathways to a variety of new anions with improved properties and analysis of their potential in catalysis. ...
Many cyanides are highly toxic. The cyanide anion is an inhibitor of the enzyme cytochrome c oxidase (also known as aa3) in the fourth complex of the electron transport chain (found in the membrane of the mitochondria of eukaryotic cells). It attaches to the iron within this protein. The binding of cyanide to this enzyme prevents transport of electrons from cytochrome c to oxygen. As a result, the electron transport chain is disrupted, meaning that the cell can no longer aerobically produce ATP for energy.[18] Tissues that depend highly on aerobic respiration, such as the central nervous system and the heart, are particularly affected. This is an example of histotoxic hypoxia.[19]. The most hazardous compound is hydrogen cyanide, which is a gas and kills by inhalation. For this reason, an air respirator supplied by an external oxygen source must be worn when working with hydrogen cyanide.[12] Hydrogen cyanide is produced by adding acid to a solution containing a cyanide salt. Alkaline solutions ...
Have Any Query? Ask Our Expert for Europe Ion Selective Electrode Market Report @http://www.marketreportsworld.com/enquiry/pre-order-enquiry/10296151 Detailed TOC of Europe Ion Selective Electrode Market Research Report:. Chapter 1 Market Overview:. 1.1 Product Overview and Scope of Europe Ion Selective Electrode. 1.2 Market Analysis by Type. 1.3 Market Analysis by Applications. 1.4 Market Analysis by Regions. 1.4.1 North America (USA, Canada and Mexico). 1.4.2 Europe (Germany, France, UK, Russia and Italy). 1.4.3 Asia-Pacific (China, Japan, Korea, India and Southeast Asia). 1.4.4 South America, Middle East and Africa. 1.5 Market Dynamics. 1.6 Market Opportunities. 1.7 Market Risk. 1.8 Market Driving Force. 1.9 Market Strategies. Chapter 2 Manufacturers Profiles:. 2.1 Company Name. 2.1.1 Business Overview. 2.1.2 Company Name Sales, Price, Revenue, Gross Margin and Market Share. Chapter 3 Global Europe Ion Selective Electrode Market Competition, by Manufacturer:. 3.1 Global Europe Ion Selective ...
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In this paper, an integration design of membrane electrode assemblies in low temperature solid oxide fuel cells (LTSOFCs) is accomplished by using a mixed ionic-electronic conductor. The mixed ionic-electronic conductor is a composite material, LiNiCuZn oxides, Gd2O3 and Sm-doped CeO2 composited with Na2CO3 (LiNiCuZn oxides-NGSDC), which consists of ionic conductor, n-type and p-type semiconductors. The multi-phase composite material can also be used in single layer fuel cell (SLFC) to replace single-phase materials. A SLFC using the LiNiCuZn oxides-NSGDC composite exhibits an OCV of 1.05 V and maximum power density of 800 mW cm-2, which is comparable to the cell performance of conventional LTSOFCs and much higher than that of SLFC reported before. The reasons leading to the good performance are porous structure of electrode and the matching of ionic conductor and semiconductor.. ...
1984) Direct determination of cyanide in seawater by ion selective electrode potentiometry. In: 6th Australian Electrochemistry Conference, 19 - 24 February, Geelong, Australia. ...

Calixarenes in lipase biocatalysis and cancer therapy | EurekAlert! Science NewsCalixarenes in lipase biocatalysis and cancer therapy | EurekAlert! Science News

Calixarenes bear a fascinating class of macrocycles that have served broadly in molecular recognition and supramolecular ... Calixarenes in lipase biocatalysis and cancer therapy. Bentham Science Publishers. Journal. Current Organic Chemistry. Keywords ... Calixarenes in lipase biocatalysis and cancer therapy This research article by Dr. Serdar Karakurt et al. is published in ... This ability of calixarenes to amplify, upon hosting different enzymes their catalytic capacity, can be fruitfully explored to ...
more infohttps://www.eurekalert.org/pub_releases/2016-08/bsp-cil081716.php

Calixarenes Roam Proteins Surface | Chemical & Engineering NewsCalixarenes Roam Protein's Surface | Chemical & Engineering News

The NMR and X-ray data were in close agreement and suggested the calixarene explores the protein surface by binding to three or ... Despite calixarenes potential for this job, researchers lacked details about how the molecules interact with protein surfaces ... A calixarene (stick) binds to the surface of the cytochrome c protein (space fill). ... A calixarene (stick) binds to the surface of the cytochrome c protein (space fill). ...
more infohttps://cen.acs.org/articles/90/i19/Calixarenes-Roam-Proteins-Surface.html

calixarene - definition and meaningcalixarene - definition and meaning

calixarene: Any of a class of organic macrocycle containing a ring of phenol groups linked by a short bridge; they mimic some ...
more infohttps://www.wordnik.com/words/calixarene

Application of Calixarenes as Macrocyclic Ligands for Uranium(VI): A ReviewApplication of Calixarenes as Macrocyclic Ligands for Uranium(VI): A Review

... Katarzyna Kiegiel, Lukasz Steczek, and Grazyna ... Katarzyna Kiegiel, Lukasz Steczek, and Grazyna Zakrzewska-Trznadel, "Application of Calixarenes as Macrocyclic Ligands for ...
more infohttps://www.hindawi.com/journals/jchem/2013/762819/cta/

Calixarene - WikipediaCalixarene - Wikipedia

The calixarene based on p-tert-butyl phenol is also a cone. Calixarenes are structurally related to the pillararenes. In 1872 ... Calixarenes have been used as the macrocycle portion of a rotaxane and two calixarene molecules covalently joined together by ... Some calixarenes are efficient sodium ionophores and are potentially useful in chemical sensors. Calixarenes are used in ... An accurate and detailed history of the calixarenes along with extensive discussion of calixarene chemistry can be found in the ...
more infohttps://en.wikipedia.org/wiki/Calixarene

Two ChemComm Viewpoints on calixarenes and cations - Chemical Communications BlogTwo ChemComm Viewpoints on calixarenes and cations - Chemical Communications Blog

Calixarenes and cations: a time-lapse photography of the big-bang. Alessandro Casnati. Chem. Commun., 2013, 49, 6827-6830. DOI ... Calixarenes and cations. Jack Harrowfield. Chem. Commun., 2013,49, 1578-1580. DOI: 10.1039/C3CC38667H ... including suggestions on other articles that were also felt to have played a seminal role in calixarene chemistry. As a result ... Jack Harrowfields Viewpoint focussing on the 1985 contribution of Tony McKerveys group to the field of calixarenes and ...
more infohttp://blogs.rsc.org/cc/2013/07/11/two-chemcomm-viewpoints-on-calixarenes-and-cations/

Two ChemComm Viewpoints on calixarenes and cations - Chemical Communications BlogTwo ChemComm Viewpoints on calixarenes and cations - Chemical Communications Blog

Calixarenes and cations: a time-lapse photography of the big-bang. Alessandro Casnati. Chem. Commun., 2013, 49, 6827-6830. DOI ... Calixarenes and cations. Jack Harrowfield. Chem. Commun., 2013,49, 1578-1580. DOI: 10.1039/C3CC38667H ... including suggestions on other articles that were also felt to have played a seminal role in calixarene chemistry. As a result ... Jack Harrowfields Viewpoint focussing on the 1985 contribution of Tony McKerveys group to the field of calixarenes and ...
more infohttp://blogs.rsc.org/cc/2013/07/11/two-chemcomm-viewpoints-on-calixarenes-and-cations/?doing_wp_cron=1516089017.8328180313110351562500

Calixarenes, Jacques Vicens (Edited ) Volker Bohmer (Edited ) - Shop Online for Books in New ZealandCalixarenes, Jacques Vicens (Edited ) Volker Bohmer (Edited ) - Shop Online for Books in New Zealand

Calixarenes: A Versatile Class of Macrocyclic Compounds (Topics in Inclusion Science (Closed)) by Jacques Vicens (Edited ) ... Volker Bohmer (Edited )Buy . Books online: Calixarenes: A Versatile Class of Macrocyclic Compounds (Topics in Inclusion Science ... Bridged Calixarenes.- 8. Double Calixarenes and Future Directions.- References.- Two: X-Ray Structural Data on Calixarene ... Calixarene-Based Cation Receptors and Carriers.- 1. Introduction.- 2. Calixarene Podands with Ether Chains.- 3. Calixarene ...
more infohttps://www.fishpond.co.nz/Books/Calixarenes-Jacques-Vicens-Edited-by-Volker-Bohmer-Edited-by/9789401074025

Calixarene Surfactants for purification of active membrane proteinsCalixarene Surfactants for purification of active membrane proteins

Calixarene surfactants are designed to structure the membrane domains of proteins through hydrophobic interactions and a ... Calixarene Surfactants. G-Biosciences offers specially formulated reagents (detergents/surfactants) to aid the extraction, ... Calixarene surfactants *These molecules are designed to structure the membrane domains of proteins through hydrophobic ... Calixarene surfactants are designed to structure the membrane domains of proteins through hydrophobic interactions and a ...
more infohttps://www.gbiosciences.com/Calixarene_Surfactants

Copper complexes bearing an NHC-calixarene unit: synthesis and application in click chemistry - New Journal of Chemistry (RSC...Copper complexes bearing an NHC-calixarene unit: synthesis and application in click chemistry - New Journal of Chemistry (RSC...

Copper complexes bearing an NHC-calixarene unit: synthesis and application in click chemistry B. Ourri, O. Tillement, T. Tu, E ... Copper complexes bearing an NHC-calixarene unit: synthesis and application in click chemistry ...
more infohttp://pubs.rsc.org/en/content/articlelanding/2016/nj/c6nj02089e

Fabrication of Nanometer Sized Si Dot Arrays Using Ar Ion Milling with Calixarene Resist Dot ArraysFabrication of Nanometer Sized Si Dot Arrays Using Ar Ion Milling with Calixarene Resist Dot Arrays

The possibility to ion-mill CoPt film using EB drawn calixarene resist pattern as a mask has been studied. We formed 30 nm ... The 39-to 106-nm-sized CoPt magnetic dot arrays were formed by30-keV-electron beam (EB) drawing with thin calixarene resist and ... T. Tamura et al., "Fabrication of Nanometer Sized Si Dot Arrays Using Ar Ion Milling with Calixarene Resist Dot Arrays", Key ... Fabrication of Nanometer Sized Si Dot Arrays Using Ar Ion Milling with Calixarene Resist Dot Arrays p.116 ...
more infohttps://www.scientific.net/KEM.459.116

Calixarene Linked Bis-Porphyrin Hosts for Fullerenes and the Assembly of Supramolecular Ferrocene-Porphyrin-Fullerene TriadsCalixarene Linked Bis-Porphyrin Hosts for Fullerenes and the Assembly of Supramolecular Ferrocene-Porphyrin-Fullerene Triads

Two different isomers of the calixarene were prepared in an analogous method to the tetra-alkylated calixarenes in Chapter Four ... Calixarene Linked Bis-Porphyrin Hosts for Fullerenes and the Assembly of Supramolecular Ferrocene-Porphyrin-Fullerene Triads. ... Calixarene Linked Bis-Porphyrin Hosts for Fullerenes and the Assembly of Supramolecular Ferrocene-Porphyrin-Fullerene Triads. ... These porphyrins have also been coupled to calixarenes to form bis-porphyrins, however these host displayed no affinity for ...
more infohttps://researchspace.auckland.ac.nz/handle/2292/19926

Experimental study of inhibition of corrosion of mild steel in 1M HCl solution by two newly synthesized calixarene derivatives,...Experimental study of inhibition of corrosion of mild steel in 1M HCl solution by two newly synthesized calixarene derivatives,...

"Experimental study of inhibition of corrosion of mild steel in 1M HCl solution by two newly synthesized calixarene derivatives ... Experimental study of inhibition of corrosion of mild steel in 1M HCl solution by two newly synthesized calixarene derivatives ... Inhibition of the corrosion of mild steel in molar hydrochloric acid by two calixarenes, including the effect of inhibitor ... Experimental study of inhibition of corrosion of mild steel in 1M HCl solution by two newly synthesized calixarene derivatives ...
more infohttps://www.deepdyve.com/lp/springer_journal/experimental-study-of-inhibition-of-corrosion-of-mild-steel-in-1m-hcl-Rwp6JhLfYC

Manganese-calcium clusters supported by calixarenesManganese-calcium clusters supported by calixarenes

Calixarene complexes of anion-bridged oligouranyl species DeLaigue, X.; Gutsche, C.; Harrowfield, J.; Ogden, Mark; Skelton, B. ... The calixarenes are synthetically versatile and well established cluster-supporting ligands, which to date have not been ... Amino acid functionalised calixarenes: crystal growth modifiers and low molecular weight gelators ... Acidic amino acid functionalised calixarenes were investigated as crystal growth modifiers. The self-assembly behaviour of ...
more infohttps://espace.curtin.edu.au/handle/20.500.11937/15614

Non-covalent calixarene-amino acid complexes formed by MALDI-MS<...Non-covalent calixarene-amino acid complexes formed by MALDI-MS<...

Non-covalent calixarene-amino acid complexes formed by MALDI-MS. Journal of the American Society for Mass Spectrometry. 2002 ... Non-covalent calixarene-amino acid complexes formed by MALDI-MS. / Stone, Michele M.; Franz, Andreas H.; Lebrilla, Carlito B. ... Stone, M. M., Franz, A. H., & Lebrilla, C. B. (2002). Non-covalent calixarene-amino acid complexes formed by MALDI-MS. Journal ... Stone, MM, Franz, AH & Lebrilla, CB 2002, Non-covalent calixarene-amino acid complexes formed by MALDI-MS, Journal of the ...
more infohttps://ucdavis.pure.elsevier.com/en/publications/non-covalent-calixarene-amino-acid-complexes-formed-by-maldi-ms

Calixarene-Based Molecules for Cation Recognition - pdf descargarCalixarene-Based Molecules for Cation Recognition - pdf descargar

Calixarene-Based Molecules for Cation Recognition. . Biblioteca virtual para leer y descargar libros, documentos, trabajos y ... Keywords: Macrocycles; Cyclophanes; Calixarenes; Ion Recognition Macrocycles; Cyclophanes; Calixarenes; Ion Recognition Autor: ... Calixarene-Based Molecules for Cation Recognition - Descarga este documento en PDF. Documentación en PDF para descargar gratis ... Abstract This review discusses molecular design principles of calixarene-type macrocycles for ion recognition and gives ...
more infohttp://libros.duhnnae.com/2017/jun6/149759813190-Calixarene-Based-Molecules-for-Cation-Recognition.php

Amino acid functionalised calixarenes:  crystal growth modifiers and low molecular weight gelatorsAmino acid functionalised calixarenes: crystal growth modifiers and low molecular weight gelators

Amino acid functionalised calixarenes: crystal growth modifiers and low molecular weight gelators. 191761_Goh2013.pdf (18.27Mb) ... Calixarenes can be used as well-defined scaffolds for investigating structure-activity relationships of additives and their ... The calixarene-electrolyte hydrogels had a fibrous appearance, as characterised by atomic force microscopy. Some hydrogels ... A racemic mixture of the proline calixarenes gave a less stable hydrogel compared with hydrogels of the enantiopure compounds. ...
more infohttps://espace.curtin.edu.au/handle/20.500.11937/1894

Specific Polymers - Catalog - building blocks and chemicals - functional calixareneSpecific Polymers - Catalog - building blocks and chemicals - functional calixarene

Thermosensitive polymers are a class of "smart" materials that have the ability to respond to a change in temperature. SPECIFIC POLYMERS synthesize a broad array of monomers and polymers of interest in this area ...
more infohttp://specificpolymers.fr/catalog/index/Building_Blocks_and_Chemicals/FUNCTIONAL_CALIXARENE?specsession=d1a9028d34473f11a51891c661daeff3

Specific Polymers - Catalog - building blocks and chemicals - functional calixareneSpecific Polymers - Catalog - building blocks and chemicals - functional calixarene

Thermosensitive polymers are a class of "smart" materials that have the ability to respond to a change in temperature. SPECIFIC POLYMERS synthesize a broad array of monomers and polymers of interest in this area ...
more infohttp://specificpolymers.fr/catalog/index/Building_Blocks_and_Chemicals/FUNCTIONAL_CALIXARENE?specsession=5eb6b5a789980e239575565260e59d4f

Specific Polymers - Catalog - building blocks and chemicals - functional calixareneSpecific Polymers - Catalog - building blocks and chemicals - functional calixarene

Thermosensitive polymers are a class of "smart" materials that have the ability to respond to a change in temperature. SPECIFIC POLYMERS synthesize a broad array of monomers and polymers of interest in this area ...
more infohttp://www.specificpolymers.fr/catalog/index/Building_Blocks_and_Chemicals/FUNCTIONAL_CALIXARENE?specsession=317efa56d27549993a7328421e856d1e

Specific Polymers - Catalog - building blocks and chemicals - functional calixareneSpecific Polymers - Catalog - building blocks and chemicals - functional calixarene

Thermosensitive polymers are a class of "smart" materials that have the ability to respond to a change in temperature. SPECIFIC POLYMERS synthesize a broad array of monomers and polymers of interest in this area ...
more infohttp://www.specificpolymers.fr/catalog/index/Building_Blocks_and_Chemicals/FUNCTIONAL_CALIXARENE?specsession=69fbcb1144095de5cb34c041106b60e5

Energy Transfer in Calixarene-Based Cofacial-Positioned Perylene Bisimide ArraysEnergy Transfer in Calixarene-Based Cofacial-Positioned Perylene Bisimide Arrays

Close The Infona portal uses cookies, i.e. strings of text saved by a browser on the users device. The portal can access those files and use them to remember the users data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser. ...
more infohttps://www.infona.pl/resource/bwmeta1.element.acs-doi-10_1021_ja058007

A calixarene derivative mediates rapid detoxification of the deadly poison VX | Atlas of ScienceA calixarene derivative mediates rapid detoxification of the deadly poison VX | Atlas of Science

A calixarene derivative mediates rapid detoxification of the deadly poison VX. On 13th February 2017, the half-brother of the ... The calixarene moreover selectively cleaves the P-S bond of VX and complete detoxification requires at least one equivalent, ... With a half-life of under 4 min, the calixarene promotes VX detoxification by a factor of 3500 over the rate of spontaneous ... On the other hand, the action of the calixarene on soman, which lacks the positively charged side chain, is much less ...
more infohttp://atlasofscience.org/a-calixarene-derivative-mediates-rapid-detoxification-of-the-deadly-poison-vx/

Recovery of dilute aqueous acetone, butanol, and ethanol with immobilized calixarene cavities<...Recovery of dilute aqueous acetone, butanol, and ethanol with immobilized calixarene cavities<...

abstract = "Macrocyclic calixarene molecules were modified with functional groups of different polarities at the upper rim and ... N2 - Macrocyclic calixarene molecules were modified with functional groups of different polarities at the upper rim and ... AB - Macrocyclic calixarene molecules were modified with functional groups of different polarities at the upper rim and ... Macrocyclic calixarene molecules were modified with functional groups of different polarities at the upper rim and subsequently ...
more infohttps://sofi-northwestern.pure.elsevier.com/en/publications/recovery-of-dilute-aqueous-acetone-butanol-and-ethanol-with-immob
  • The word calixarene is derived from calix or chalice because this type of molecule resembles a vase and from the word arene that refers to the aromatic building block. (wikipedia.org)
  • He introduced the name "calixarene": from "calix", the Greek name for a chalice, and "arene" for the presence of aryl groups in the cyclic array. (wikipedia.org)
  • The self-assembly behaviour of proline functionalised calixarenes were also examined.Calixarenes functionalised at the wide-rim with acidic amino acids were investigated as potential crystal growth modifiers on model mineral systems and were compared with previously investigated narrow-rim analogues. (edu.au)
  • The 1H NMR spectra of L-proline calixarene in the presence of small molecules (tetrahydrofuran, 1-methyl-2-pyrrolidinone, and tert-butyl alcohol) suggested that the calixarene was either acting as a host or selfassembling into larger aggregates. (edu.au)
  • Calixarenes resemble chalices (calix in Latin) with hydrophobic cavities that can hold smaller molecules or ions, an example of host-guest chemistry. (wikipedia.org)
  • Earlier this year, Jack Harrowfield's Viewpoint focussing on the 1985 contribution of Tony McKervey's group to the field of calixarenes and cations generated an enthusiastic response, including suggestions on other articles that were also felt to have played a seminal role in calixarene chemistry. (rsc.org)
  • Chemically Modified Calixarenes as New Selective Receptors for Monovalent Cations. (fishpond.co.nz)
  • 5. Ionizable Calixarene Ligands. (fishpond.co.nz)
  • The calixarenes are synthetically versatile and well established cluster-supporting ligands, which to date have not been reported to support a calcium/manganese cluster. (edu.au)
  • Calixarene surfactants are designed to structure the membrane domains of proteins through hydrophobic interactions and a network of salt bridges with the basic residues found at the cytosol-membrane interface of membrane proteins. (gbiosciences.com)
  • In addition to demonstrating potentially useful new sorbents, these materials provide some of the first experimental estimates of the energy of interaction between aqueous solutes and hydrophobic calixarenes, which have previously been inaccessible because of the insolubility of most nonionic calixarene species in water. (elsevier.com)
  • Computational modeling has indicated that the removal of the hydrogen bonding motif inverts the pinched cone conformation of the calixarene scaffold, which translates to an unfavorable changes in the geometry of the binding site between the porphyrin planes. (auckland.ac.nz)
  • On the other hand, the action of the calixarene on soman, which lacks the positively charged side chain, is much less pronounced, indicating that the initial complexation step, which is particularly effective if the nerve agent is cationic, is important for rapid degradation. (atlasofscience.org)
  • According to these theoretical results,it can be drastically concluded that the dielectric permittivity of the solvent is a key factor that determines the chemical behavior of Calixarene with histidine L and D stereochemistry in solution. (ac.ir)
  • C4v symmetric geometry for calixarene in benzene solvent, with three negative force constants. (imperial.ac.uk)
  • Also described in this thesis, is the functionalization of the calixarene scaffold with ferrocene for the preparation of supramolecular triads. (auckland.ac.nz)
  • Chapter Four describes the functionalization of the wide rim of the calixarene scaffold with ferrocene via palladium catalyzed coupling reactions. (auckland.ac.nz)
  • The functionalization of ferrocene to the wide rim of the calixarene bisporphyrin resulting in minor fluorescence quenching of the porphyrin moieties suggesting the ferrocenes are at a remote distance from the porphyrins promoting the lifetime of the charge separated state through a second electron transfer. (auckland.ac.nz)
  • Inclusion Properties and Host-Guest Interactions of Calixarenes in the Solid State. (fishpond.co.nz)
  • We formed 30 nm pitch resist dot arrays with a dot diameter of 20 nm using 30-keV-EB lithography with calixarene resist. (scientific.net)
  • The 39-to 106-nm-sized CoPt magnetic dot arrays were formed by30-keV-electron beam (EB) drawing with thin calixarene resist and 200-eV-Ar ion milling. (scientific.net)
  • These porphyrins have been coupled to calixarenes to construct bis-porphyrin hosts. (auckland.ac.nz)
  • The tetra alkylation of the calixarenes with methyl and butyl groups bis-porphyrin hosts displayed lower binding affinities for fullerene by an order of magnitude lower than their dialkylated counter parts. (auckland.ac.nz)
  • This animation depicts how a calixarene might explore, and effectively camouflage, cytochrome c's surface. (acs.org)
  • Masking lysines is an established trick for coaxing protein crystallization, another potential calixarene application, according to the researchers. (acs.org)
  • Calixarenes have also obliged as drug delivery machineries that are responsive to the tumor microenvironment and a selective release of the drug to cancer cells has been achieved. (eurekalert.org)
  • This work briefly reviews the recent development of calixarenes. (tubitak.gov.tr)
  • The NMR and X-ray data were in close agreement and suggested the calixarene explores the protein surface by binding to three or more lysine side chains. (acs.org)
  • Two: X-Ray Structural Data on Calixarene Architectures. (fishpond.co.nz)
  • Conformations of Calixarenes in the Crystalline State. (fishpond.co.nz)
  • Transition state for enantiomerization of a calixarene in the gas phase. (imperial.ac.uk)
  • So the answer seems to be that a calixarene enantiomerizes via transition state not of C 4v but of C s symmetry, and which resembles a zwitterion but is not actually one. (imperial.ac.uk)
  • Polarisation curves revealed that the calixarenes are mixed-type inhibitors. (deepdyve.com)
  • A calixarene (stick) binds to the surface of the cytochrome c protein (space fill). (acs.org)
  • Although activity is not yet high enough to allow an in vivo use, this calixarene clearly represents a highly promising lead structure for synthetic scavengers, which may allow in the near future the efficient treatment of victims of organophosphonate poisonings. (atlasofscience.org)
  • With a half-life of under 4 min, the calixarene promotes VX detoxification by a factor of 3500 over the rate of spontaneous hydrolysis. (atlasofscience.org)