Synthesis and conductivities of (μ-cyano)phthalocyaninatometal compounds

A review of the synthesis and characterization of a new type of stacked, bridged macrocyclic metal complexes, the (μ-cyano)phthalocyaninatometal compounds [PcMCN]_n (2) is given. By using the routes described in Fig. 3 the polymers were synthesized with M = Co³⁺, Fe²⁺, Fe³⁺, Mn³⁺ and Cr³⁺ as the central metal ion. The compounds were characterized by IR, far-IR, UV, thermal and elemental analysis, and partly by ¹H NMR and FD (field desorption) mass spectroscopy.[PcCoCN] (2a) and [PcFeCN]_n (2b) exhibit d.c. room temperature conductivities around 10^?2 S/cm without doping, thereby showing conductivities which are in the same range as the iodine-doped phthalocyaninatosiloxanes [PcSiO]_n.     

Identification of Pneumocystis carinii f. sp. hominis gene sequences in filtered air in hospital environments

To evaluate the risk of a nosocomial spread of Pneumocystis carinii f. sp. hominis (P. carinii hominis), air filter samples from rooms of P. carinii pneumonia (PCP) patients, adjacent corridors, and other hospital environments have been investigated for the presence of P. carinii hominis. Amplified DNA from air filters and sputum or bronchoalveolar lavage samples from the PCP patients have been genotyped with the P. carinii hominis genes of the mitochondrial large-subunit (mtLSU) rRNA and the internal transcribed spacers (ITS1 and ITS2) of the rRNA. Genotypes of the two loci were identified by direct sequencing, and for site 85 of the mtLSU locus, three allele-specific PCR assays were used. P. carinii hominis DNA was identified in the air of five of seven PCP patient rooms and in the air of two of four air filtrations from the ward corridors. The P. carinii hominis genotypes were the same in four of the five room air samples as those in the corresponding patients, suggesting a risk of person-to-person transmission of P. carinii hominis from PCP patients. Three of 16 air samples collected in infectious disease wards without the presence of PCP patients and one sample from a cardiology unit in a separate hospital building were also positive, which further strengthens the possibility of acquisition of P. carinii hominis from the environment.     

The Influence of Slow Blood Volume Waves on the Shape of the Dicrotic Complex

Recorded arterial blood volume pulses are often superimposed on slow rhythmic volume waves. It was noticed that in such recordings the dicrotic complex changes its shape as a function of the volume wave; on the ascending limb of the volume wave the dicrotic complex becomes more pronounced, whereas on the descending limb it becomes attenuated. In order to explain this observation a mathematical analysis of the recording was performed. The analysis suggests that the changes in the shape of the dicrotic complex can be explained by assuming a superposition of arterial wall extensions caused by volume changes due to 1) the downstroke of the volume pulse, 2) the dicrotic complex, and 3) the ascending (or descending) limb of the volume wave. Three functions simulating these three vascular events were electronically generated and superimposed. The result shows that the simulated dicrotic complex changes its shape in a similar manner as in the physiological recording, strengthening the proposed explanation. The origin of the dicrotic complex and of rhythmic waves in blood volume and blood pressure is still unclear and their interaction, therefore, is difficult to understand. The present paper offers a possible explanation for a case in which the shape of the dicrotic complex, appearing on a blood volume pulse, changes as a function of a rhythmic volume wave.     

Design of a positive resist for projection lithography in the mid-UV

The design, synthesis, formulation, and process optimization of a new mid-UV resist are described. The synthesis of a spectrally matched sensitizer was guided by semiempirical quantum mechanical calculations that predict the effect of structural changes on optical absorption characteristics. The formulation was guided by computer profile simulation studies and the process development by a response surface analytical procedure. These techniques allowed formulation optimization to be achieved on the basis of an understanding of the complex interactions between the resist dissolution response functions and the modulation transfer function of the exposure tool for which the resist was designed.     

Ermittlung der dynamischen Werkstoffkonstanten von bituminös gebundenen Baustoffen

The evaluation of the dynamical properties of bituminous mixtures An experimental method for the evaluation of the dynamical properties of bituminous mixtures is presented. Because of their viscoelastic behaviour the design of a special testing device was necessary. In this paper the guiding ideas for this testing machine are developed. Moreover, some experimental results and experiences, which could be valuable for calculating the stresses in road constructions, are given.     

Synthesis of palladium nanoparticles using a continuous flow polymeric micro reactor

A continuous flow polymeric micro reactor, fabricated using a negative photo resist SU-8 on a 10 x 10 cm PEEK (polyetheretherketone) substrate by standard UV lithography, was utilized to synthesize palladium nanoparticles. The nanoparticles were characterized by Transmission Electron Microscopy, Selected Area Electron Diffraction and X-ray Diffraction. The Pd nanoparticles synthesized in the micro reactor were found to have a narrower size distribution when compared with those obtained by the conventional batch process.