Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 9

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  configuration
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
The aim of the study was to investigate the distribution of the circle of Willis variants in Polish population by means of computed tomography angiography (CTA). The results were then analysed and compared with another study that used similar methods but that was carried out on an ethnically distinct population. Patients presenting with intracranial pathology were excluded from the initial study population. In total, 250 CTA belonging to 129 female and 121 male patients were reviewed. A modified classification system of the circle was proposed, which took into consideration the anterior and the posterior aspects of the circle individually. The typical variant of Willis’s circle occurred in 16.80% of cases. The anterior and the posterior portions of the circle were normal in 47.20% and 26.80% of the patients respectively. As for the anterior part, lack of the anterior communicating artery was the most frequent abnormality (22.80%). Bilateral absence of posterior communicating arteries was the most common anomaly in the posterior part of the circle (29.20%). This type of anomaly was also the most common, when taking into consideration the entire circle (12.00%). There were statistically significant differences between the age groups and genders when considering the occurrence of an incomplete circle. Overall, a substantial proportion of patients manifested clinically important variants that were incapable of providing collateral circulation. Comparison with other imaging-based and cadaveric studies revealed noticeable differences, that may have resulted from the variable technical features of other studies or other factors such as the ethnical origins of the studied populations. (Folia Morphol 2013; 72, 4: 293–299)
The lifetime distribution calculations were applied to study the influence of configuration of amino-acid residues in positions 2 and 3 on changes in conformation of the peptide chain of cyclic analogues of enkephalins containing a fluorescence energy donor and acceptor in different solvents. In all the solvents studied the lifetime distributions were bimodal. This testified to the presence of two families of conformations. In this paper the relationship between the population of each conformation and configuration of the residues in position 2 and 3, and the solvent used is discussed.
The study analyzed changes of vacuum and the range of vacuum amplitude in a milk line of a tube milking unit. Two manners of connecting six milking machines to the installation of the milking machine were used. Milking machines were connected successively, beginning with the first stand tap lying the closest to the final unit, and then beginning with the sixth stand tap found the furthest in relation to the final unit for two configurations of the milk line (arm and arm with the wash supporting line) and for three systems of vacuum regulation. The studies showed a significant influence of the total liquid stream from the milking machines Qmr, the mean velocity of the flowing liquid vcśr and a configuration of the milk line on the drop and range of vacuum amplitude aP14 in the transport zone of the milk line. The decrease of vacuum in the transport zone for the configuration of the milk line - arm, with full loading of the installation was 5 kPa, and the range of its amplitude was about 8 kPa. For the configuration of the milk line arm with a wash supporting line the drop of vacuum was 2 kPa, and its range of amplitude - about 6 kPa. In the section of the milk line with the working cluster, drops of vacuum were significantly dependent on the quantity of the flowing liquid Qmr and on the appearing "thresholds of liquid" at the stand taps. The range of vacuum amplitude aP14 in the milk line in the section with the working cluster changed from 1 to 9 kPa.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.