Search

The article focuses on a study revealing that Venomous Agent X and related organophosphonate nerve agents are deactivating the enzyme acetylcholinesterase causing the neurotransmitter acetylcholine to build up which results to the poisoning of the central and peripheral nervous systems. Details about detoxification and calixarene are highlighted.

The article discusses the use of calixarene ligands in surface catalysis of metal nanoparticles. It mentions the importance of using organic ligands in modifying metal surfaces such as preventing the particles from agglomerating and serving as an aid to activate metal catalyst. Alexander Katz of the University of California, Berkeley, stated that his group developed a method for bonding calixarenes to gold nanoparticles and a spectroscopic procedure to analyze the metal surface accessibility.

Reports that there is an easy two-step strategy used to prepare calixpyridines according to scientists at the University of Texas, Austin. Reference to Jonathan L. Sessler, leader of the scientists group and chemistry professor; Comments made by chemistry professor, Prasanna de Silva; What Calixpyridines are; Who developed the two-step strategy; How this strategy is done.

Focuses on the effort of Hebrew University's Silvio E. Biali and his team to improve the tenuous hold of calixarenes on neural organic guest molecules in solution. Development of a catalyst for the reaction; Results of Biali's experiment.

The article highlights a study by Francesco Sansone and Rocco Ungaro of the University of Parma which shows that a formulation containing a calix[4]arene macrocycle delivers DNA more reliably than a commercially available transfection reagent. The study explains that the attachment points for the guanidinium moieties are hydroxyl groups and have low toxicity and efficiently transport DNA into a variety of cells.

The article reports on the discovery of another capability of calixarene through research conducted at the University of Missouri in Columbia, Missouri. Research showed that calixarene rapidly and irreversibly absorb gases such as carbon dioxide and acetylene with just a little tweaking. The breakthrough creates an opportunity to use calixarenes to separate and store gases.

Focuses on the production of effective epoxidation catalysts by grafting titanium-calixarene complexes onto silica. Prevention of oligomerization; Formation of unreactive and unselective Ti-O-Ti structures; Observation of long-term stability under ambient storage conditions.

Reports on research results by Jerry Atwood et al. which indicate that nonporous crystals of a calixarene dimer selectively absorb and retain CO, CO2 and other gases while neglecting H2. Researchers' belief that the organic crystals could be used like activated carbon or zeolites to purify hydrogen for use in fuel cells; Better understanding of absorption of gases by solids.

Examines the calixarene hold on methane and halocarbons in extraordinary stable inclusion compounds. Use of compound in separation and purification of gases; Discussion on the commercial demand for methane storage media; Emphasis on engineering improved systems.

Presents science and technology issues relevant to the chemical industry for the week of December 13, 1999. Includes the development of a calixtrene containing a crown ether moeity by researchers form Saitama University in Japan; Application of an osmium-catalyzed asymmetric dihydroxylation olefins as an effective route to chiral diols; Features of gas-phase metal carbides.

Reports on the discovery of a technique of synthesizing p-sulfonatocalix[4]areneanion tubes and spheres. Utilization of pyridine N-oxide and lanthanide ions to the reaction; Internal and external features of the surfaces.

Offers information on a study that synthesized the ditin(II) and digermanium(II) calixarenes by the reactions of a tert-butylcalix[4]arene with tin(II) and germanium(II) bis(amides). Details on calixarenes; Reason ditin(II) and digermanium(II) calixarenes are devoid of acceptor capability; Comments from professor Jerry L. Atwood.

Features a calixarene which has been found to form a chiral, spherical supramolecular assembly. Description of chemical structure; Stability of the compound.