The Effect of subsp. Infection on the Productivity of Cows in Two Dairy Herds with a Low Seroprevalence of Paratuberculosis.

Paratuberculosis is a chronic, progressive enteritis of ruminants, caused by subspecies . It affects the productivity of infected dairy cows, causing a reduction in the daily milk yield and basic milk components. The aim of the study was to determine the effect of subspecies on the productivity of dairy cows in two herds.

Examination of the chemical changes in cured phenol-formaldehyde resins during storage.

Chemical changes occurring within cured phenol-formaldehyde resins (resite and novolak type) during their storage were investigated by FT-NIR, py-GCMS and inverse gas chromatography. It was shown that a mixture of resite with novolak was less stable than resite or novolak itself as regards bulk properties. This aging phenomenon is mainly due to reaction of ammonia (product of hexa decomposition) with CH2OH groups present in resite.

Assessment of the chemical changes during storage of phenol-formaldehyde resins pyrolysis gas chromatography mass spectrometry, inverse gas chromatography and Fourier transform infra red methods.

The chemical changes occurring in the phenol-formaldehyde resins (resol and novolac type) during their storage were investigated. In this paper the FT-IR, py-GCMS and inverse gas chromatography methods were applied for assessment of the changes occurring during storage of the phenolic resins. We have found that during storage some examined resins occurred partial curing.

The YJL185C, YLR376C and YJR129C genes of Saccharomyces cerevisiae are probably involved in regulation of the glyoxylate cycle.

The ER24 aci (acidification) mutant of Saccharomyces cerevisiae excreting protons in the absence of glucose was transformed with a multicopy yeast DNA plasmid library. Three different DNA fragments restored the wild-type phenotype termed Aci- because it does not acidify the complete glucose medium under the tested conditions. Molecular dissection of the transforming DNA fragments identified two multicopy suppressor genes YJL185C, YJR129C and one allelic YLR376C.

The aminoesters as inhibitors of plasma membrane H+-ATPase in the yeast Saccharomyces cerevisiae.

A set of oxalates of alpha-dimethylamino fatty acids n-alkyl esters (MEM-ns and n-MEM-8s) and n-dodecyl-N,N-dimethylalaninate (DMAL-12s) were synthesized. Their activities on the growth, transport, and ATPases from the yeast Saccharomyces cerevisiae were compared. The compounds differ in the number of carbon atoms in their aliphatic chain and in the position of that chain in their molecular structure.