Ograniczanie wyników

Czasopisma help
Autorzy help
Lata help
Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 27

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  wskazniki odpornosci
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
1
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Testing apple resistance to dynamic loading

100%
This paper aims at finding a simple method of determining a parameter, linking the deformation energy with impact velocity and extent (size) of damage, known as the resistance factor, and investigates its variation over the periods of harvest and storage. The resistance factor was found to be significantly influenced by the apple variety, date of the test and by method of storage. Apples of greater firmness were found to have higher values of resistance factor during harvest, this is valid for apple variety and the date of test. The resistance factor was found to undergo apparent rise during storage, probably as a result of the rise in viscosity and damping characteristics of the material.
The examinations were carried out on 40 healthy rabbits of mixed breed and sex weighting from 1.8 to 2.2 kg at the age of 12 weeks, i.e. at the beginning of the experiment, and 3.0 to 3.2 kg (20 weeks old) at the end of the examinations. The blood samples were taken 9 times at intervals of 7 days from the peripheral ear venas of rabbits, after which the ability of blood elements for adherence and phagocytosis was determined; moreover, the spontaneous and stimulated NBT tests were done. In addition the activity of myeloperoxidase in the blood cells, serum lysozyme activity, the level of IgG and total immunoglobulins expressed in ZST units were evaluated. The examinations revealed an increased tendency of adherence, nitrotetrazole reduction, the production of serum IgG, phagocytosis, and a drop in the amount and activity of serum lysozyme. No changes were observed regarding the myeloperoxidase activity, the percentage of phagocitizing cells and the amount of serum immunoglobulins calculated in ZST units. It was found that only the index of phagocytosis and spontaneous NBT test reduction were in accordance with data presented by other authors. The findings in respects to the percentage of phagocitizing cells differed significantly.
Badano wpływ zespołu flawonoidowo-saponozydowego (FSC) na odpowiedź komórkową (odczyn nadwrażliwości na DNCB), odpowiedź humoralną (poziom przeciwciał dla gronkowców, pałeczek okrężnicy i antygenu Forssmana; występowanie komórek produkujących przeciwciała PFC) oraz aktywność fagocytarną granulocytów u królików, świnek morskich i myszy. FSC podawano w dawce 5 i 10 mg/kg masy ciała przez 7 dni łącznie z antygenem (szczepionka gronkowcowa, krwinki czerwone barana) lub przed immunizacją. Stwierdzono pobudzający wpływ FSC na aktywność fagocytarną granulocytów obojętnochłonnych, odpowiedź humoralną i komórkową.
The examinations were done on 7 healthy Polish ponies from 1.5 to 14 years of age. The experimental animals were intravenously injected Escherichia coli LPS at a dose of 0.1 µg/kg b.w. Clinical observations and blood collection for laboratory examinations from the external neck vein were done just before endotoxin injection and then for 8 hours at one hour intervals and after 24, 48, 72 and 96 hr. from endotoxin application. All horses were examined routinely clinically (rectal temperature, pulse, respiration rate) and hematologically (total number of leukocytes, differential leukocyte count). Phagocytic activity of neutrophilic granulocytes was evaluated on the basis of the percentage of phagocytic cells (KF) and the phagocytic index (IF) using a standard Staphylococcus aureus strain. Moreover, the nitrotetrazolium blue reduction test (NBT) was done by a microquantity method. Clinical observations and hematological examinations in the experimental animals were typical for endotoxemia of horses. It was also found that LPS of E. coli at the administered dose stimulates unspecific immunity because it increases the value of KF, IF and NBT during the whole period of experimentation.
The aim of the study was to monitor alterations in selected indices of innate immunity (the phagocytic index and percent of phagocytes) and acquired immunity (numbers of lymphocytes T and their Th and Tc/Ts subpopulations) in 60 rabbits experimentally infected with haemagglutinogenic Czech strain CAMP V-351 and non-haemagglutinating Polish BLA. The haemagglutinogenic Czech strain CAMP V-351 is active only in select indices of innate immunity, whereas non-haemagglutinating Polish strain BLA is reactive in the parameters of acquired immunity. Therefore, the obtained results permit the conclusion that the examined strains are not only serologically different but they also induce distinct patterns of immune responses, which provides evidence of immunotypes among this virus.
In piglets of the miniature pig there was assessed the influence of Levamisole or Biotropin on the humoral and cellular immune response against Aujeszky’s disease virus and on some nonspecific indices of immunity. It was found that the drugs did not influence humoral response, i.e. they did not increase the level of antibodies; however, they enhanced specific cellular response. In animals treated with the drugs there were observed an increase of migration inhibition of leukocytes and the augmented index of lymphocyte transformation. Besides, a higher concentration of lysozyme and the activity of phagocytes were noted.
Adult chickens (1.4—1.8 kg of body weight) were immobilized for 5 hours for 3 consecutive days after the prior application of immunosuppresive doses of levamisole for 14 days and immunostimulative injections of TFX (extract from thymus); the drugs were given alone or together. The concentration of corticosterone lysozyme, globulins, the degree of blast transformation and metabolic activity of leukocytes (NBT) were evaluated. The studies did not reveal any correlation between the level of corticosterone and the indices of immunity. An increase of corticosterone and its decrease was found following immobilization and the use of TFX and levamisole respectively. However, immobilization, TFX and levamisole brought about the growth of metabolic activity of leukocytes and lymphocytes transformation. The level of lysozyme was reduced by immobilization and the administration of levamisole; its growth was noted following the application of levamisole with immobilization at the same time. The above treatment of the animals diminished the level of globulins in the blood. The results indicated to a diversity of immune response in chickens and the lack of any correlation between it and the suprarenal gland.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 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.