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1

Subtilisin embedded in TAC fibre - properties and application

100%
Trzmiel T., Szczesna-Antczak M., Rzyska M.
Biotechnologia
|
2001
|
issue 4
175-188
EN
The embodiment of subtilisin from Bacillus subtilis IBTC-3 in triacetylocellulose (TAC) fibre was studied. The fibre preparation of proteolytic activity 51.3 AmU/g was obtained with 16.6% of yield. The properties of subtilisin embedded in TAC fibre were investigated. The preparation showed optimal proteolytic activity at pH 9 and temperature 65-70C. It was stable in a wider range of pH and temperature than the native subtilisin. The KM value for haemoglobin was 2.6 ? 10-3 M. The TAC-fibre biocatalyst, in the fixed bed column, was successfully applied for hydrolysis of casein.
2

Structure of skeletal muscles in Leghorn type chicken from conservative and parent flocks

100%
Elminowska-Wenda G.
Folia Biologica
|
2007
|
vol. 55
|
issue 3-4
147-152
EN
Intensive selection conducted within closed populations has led to the creation of specialized chicken strains that differ significantly in meat yield and reproduction performance. The effect of the selection conducted on the birds is differentiation identified not only on the molecular but also on the cellular level, among other things in the skeletal muscles. The aim of this study was to compare the structure of chosen homological skeletal muscles from Leghorn chickens (LSL), originating from parent flock, intensively selected for reproductive traits and from conservative flock (G99), unselected for many generations. The structure of musculus pectoralis superficialis and musculus biceps femoris (the thickness of the muscle fibres and the share of the fibre types in the bundle) in 8 and 20 week old chickens was compared. A significant impact of the origin on all examined slaughter parameters was recorded. Body weight before slaughter, carcass weight and the weight of breast and leg muscles in 8 weeks old LSL chicken made up from 60%to about 85%of the respective values in the G99 Leghorn. Lack of red fibres in the breast muscles of all the individuals from the parental flock (LSL) was noted, whereas in 12 individuals (among 24) from the conservative flock (G99), red fibres were observed in this muscle from 2.75%up to 7.09 %. White fibres in 8 week old chicks were always thicker, both in pectoralis superficialis and biceps femoris muscle in birds with higher body weight as well as higher weight of breast and legs muscles, i.e. in chicks from conservative flock (G99), P<0.01. However, in 20 week old birds, the diameters of the white fibres were similar in both groups. Also the diameters of the red fibres in musculus biceps femoris in 8 week old chickens were higher in cockerels and pullets from conservative flock (G99).
3

Novel SNP of the goat prolactin gene (PRL) associated with cashmere traits

88%
Lan X.-Y., Pan C.-Y., Chen H., Lei C.-Z., Li F.-Y., Zhang H.-Y., Ni Y.-S.
Journal of Applied Genetics
|
2009
|
vol. 50
|
issue 1
51-54
EN
Concentrations of the single-chain polypeptide hormone prolactin (PRL) are associated with wool or cashmere traits, and its seasonal changes may determine patterns of enzymatic activity and may affect cashmere fibre growth and moult. So, the PRL gene is a potential candidate gene for cashmere traits in marker-assisted selection (MAS). In this paper, we report a novel missense single-nucleotide polymorphism (SNP) within the goat PRL gene in 1367 individuals by PCR-SSCP (polymerase chain reaction with single-strand conformation polymorphism) analysis and DNA sequencing. The novel X76049:g.576C>A mutation is confirmed by Eco24I PCR-RFLP (restriction fragment length polymorphism) analysis and causes a missense codon (Pro176Thr). The frequencies of allele C varied from 0.79 to 0.93 in 9 analysed goat populations. C allele was correlated with higher fibre length (P = 0.014).
4

X-ray microanalysis of myotomal muscle in the sunbleak, Leucaspius delineatus (Heckel) and goldfish, Carassius auratus gibelio L.

88%
Tylko G., Roomans G., Kilarski W.
|
EN
The functioning of a group of muscle fibres as a tissue that performs a well characterized type of contraction (slow or fast) depends on their biochemical and structural organization that is already well established. The biochemical and structural diversities between three types of fish muscle fibres found also a reflection in the content of light elements. The present work demonstrates significant differences in the content of diffusible elements (Cl, K, Na, and Mg) and bound elements (P and S) between the muscle fibres types. In general all muscle fibre types of goldfish (Carassius auratus gibelio) that belongs to stationary slow-swimming fish has lower K/Na ratios than those in all three fibre types of fast swimming sunbleak (Leucaspius delineatus).
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