Immobilization of a sulfide-oxidizing bacterium in a novel adsorbent biocatalyst support

Applied Biochemistry and Biotechnology - Preliminary experiments have shown thatT. denitrificans strain F can be immobilized in DuPont BIO-SEP beads and used to treat refinery spent sulfidic...     

Allylic amidation. An investigation of nitrosocarbonylmethane for direct allylic functionalization of olefins

Nitrosocarbonylmethane reacts with a variety of olefins $\text{via}$ an ene pathway, yielding N-substituted hydroxamic acid products in a preparatively useful reaction. With unsymmetrical olefins, observed regiochemical preferences can be rationalized by a mechanism involving electrophilic addition of nitrogen to the olefin.     

ESCA study of fractional monolayer quantities of chemisorbed gases on tungsten

X-ray photoelectron spectroscopy (ESCA) has been used in a study of CO and O₂ chemisorbed on a polycrystalline tungsten sample. Working under ultra-high vacuum conditions, the surface was cleaned and then covered with known monolayer and fractional monolayer quantities of adsorbed CO and O₂. The O(ls) and C(ls) spectral features were detected, and the influence of an adsorbed layer on the tungsten spectral features was determined. A chemical shift of 3.4 eV in the O(ls) line from chemisorbed CO is related to the different modes of bonding of CO to tungsten. A model calculation of the photoelectron yields expected from an adsorbed monolayer is in good agreement with the experimental results.     

Integration of Markov and Linear Programming Models to Assess the Farmgate and National Consequences of Adopting New Bovine Reproductive Technologies in the United Kingdom Agriculture

Despite many advances in biotechnology being futuristic, in some industries such technological improvements are now becoming generally available for absorption into commercial practice. The new reproductive technologies for bovine animals are such an example. For a regulated industry like agriculture, an ex ante evaluation of the impact of their adoption is the concern of policy makers. This paper describes a modelling strategy devised to assess these impacts, using a sequence of stochastic, financial and linear programming models. A set of individual farm type models were developed and later extended to a national model to simulate the interactions that occur between dairy and beef enterprises and the competition between them for resources on individual farms. Restraints reflecting national policies such as quotas on milk production and industry support through subsidies are built into the model to explore several scenarios. These models are used to assess the impact of new technologies on dairy and beef production nationally and for regions which have been identified by the Ministry of Agriculture, Fisheries and Food.     

Desorption methods as probes of kinetics and bonding at surfaces

This paper is divided into two parts. Firstly, a review of desorption methods is presented, with emphasis on the use of temperature programmed desorption (TPD) and electron stimulated desorption (ESD) for understanding the bonding of adsorbed species to surfaces. Secondly, recent studies of the angular distribution of ESD ions from adsorbed layers on W(011) are discussed. The ESD of O⁺ ions from oxygen adsorbed on a stepped W(011) surface is shown to be sensitive to the presence of atom steps.     

Evidence for the conformation of H2O adsorbed on Ru(001)

The electron stimulated desorption ion angular distributions (ESDIAD) method has been used to study the adsorption of H₂O by Ru(001). The results indicate that chemisorbed, undissociated H₂O is bonded to Ru via the oxygen atom, and that interactions between neighboring molecules occur as coverage increases. The utility of ESDIAD for structure determination in the absence of long range order is demonstrated.     

Comparison of packed and capillary columns for practical SFC separations

Summary A newly developed polysiloxane-type packing material shows promise for use in SFC. Relatively polar compounds were eluted from a microbore column with good peakshape using a mobile phase consisting of CO₂ modified with formic acid and water. The latter combination is an effective modifier suitable for use with pressure programming and FID detection.

---

Vergleich von gepackten und Capillar-Säulen für praktische SFC-Trennungen

     

Die Struktur der Grenzfl?che Kiesels?ure/Elektrolyt

Ohne Zusammenfassung