No abstract available

[en] Abstract only

[en] Preparation and reaction of substituted and unsubstuted salicyloyl chloride were investigated in this thesis, and therefore substituted and unsubstituted salicyloyl chloride were reacted with methyl thiocyanate to form bicyclic compounds (thio benzoxazine), in which SCN group is retained in the product, while the substituted thiocyanate is lost as methyl chloride. (17 tabs., 9 figs., 36 refs.)

[en] The ring systems present in the two major classes of ophiobolane sesterterpenes have been obtained via a common bicyclic intermediate. In each case, the eight-membered ring was constructed by fragmentation of an appropriately functionalized bicyclo[3.3.1]nonane ring system

[en] Ammonium uranate having safe handling properties is claimed. It consists of smooth, spherical agglomerates having an average diameter of between 30 and 150 μm, an uncompacted apparent bulk density of 2 to 2.8 g/cm³ (measured according to the French standards NFA95-111 of February 1977), flow properties, measured on the CARR scale, greater than or equal to 95 and a low content of SO₄^2- ions of between 0.5 and 1%

No abstract available

[en] A critical barrier to the routine use of nanomaterials is the tedious, expensive means of their synthesis. Microreaction technology takes advantage of the large surface area-to-volume ratios within microchannel structures to accelerate heat and mass transport. This accelerated transport allows for rapid changes in reaction temperatures and concentrations leading to more uniform heating and mixing which can have dramatic impacts on macromolecular yields and nanoparticle size distributions. Benefits of microreaction technology include higher yield and reactant conversion, better energy efficiency and less by-product generation. Microreactors can help minimize the environmental impact of nanoproduction by enabling solvent free mixing, integrated separation techniques and reagent recycling. The possibility of synthesizing nanomaterials in the required volumes at the point-of-use eliminates the need to store and transport potentially hazardous materials and provides the flexibility for tailoring complex functional nanomaterials. Recognizing these benefits for nanosynthesis, continuous flow microreactors have been used by several research groups to synthesize and characterize nanomaterials. An overview of these efforts and issues related to scale up and other post synthesis processes such as separation and deposition are presented in this paper.

No abstract available

[en] Metal phthalocyanine play an important role in the field of dyes and pigments. Copper phthalocyanine and its derivatives are the most stable compounds in this series. (46 figs., 9 tabs., 61 refs.)

[en] Methods are described for exposing to ¹⁵N₂ systems ranging in complexity from free-living microorganisms to complex associations in the rhizosphere. The simplest chambers for the anaerobic incubation of soil, leaf litter, rotting wood etc. require only an oxygen-scavenging system, but when defined oxygen tensions are required, some system of oxygen control must be incorporated to compensate for respiratory losses. For simple photosynthetic organisms such as blue-green algae illumination must be provided but because incubation periods are short, little if any control of CO₂ or O₂ is necessary. The most complex asymbiotic system, the higher plant rhizosphere association, requires a protracted exposure to ¹⁵N₂ with adequate control of CO₂, temperature, light intensity, soil moisture and plant transpiration to maintain normal plant growth over sufficiently long periods to give a valid estimate of nitrogen fixation. (author)