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Ion transport in rabbit caecum at 12 and 36 months of age

100%
The aim of this study was to investigate the effect of aging on sodium and chloride ions transport in the isolated rabbit coecum. The experiment consisted in measuring PD- transepithelial electrical potential difference mV SM-mechanical stimulation and mechano-sensitivity (dPD) in collected from 12- and 36-month-old rabbits. A modified Ussing system was used for the experiment. Under the incubation in Ringer solution the values of PD and dPD of young rabbit caecum were, respectively, -3.0 ±0.4 mV and -1.2 ±0.3 mV. In 36-month rabbits, on the other hand, the values of these parameters were lower, PD by about 90% whereas dPD by about 83%. Incubation of young rabbits caecum with the presence of amiloride resulted in a reduction of PD by about 17 % and dPD by about 50%, while it did not influence the electrophysiological parameters of caecum in 36-month rabbits. Incubation with bumetanide on young rabbits caecum resulted in PD dropped by about 70% and dPD by about 83%. In the same incubation conditions as those applied for incubation of 36-month rabbits caecum, the level of PD decreased by about 67% while dPD by about 50%. Incubation of young rabbits caecum at the presence of both transport inhibitors resulted in PD decreased by about 87% and dPD by about 83%, whereas that applied for the old rabbits' caecum reduced PD by about 90%, without influencing dPD. Presented data demonstrate that the process of organism ageing inhibits sodium ion transport as well as reduces caecum epithelium sensitivity to mechanical stimuli. Probably, it is a consequence of a reduced with age release of neurotransmitter from sensory terminals; these neurotransmitters modify transepithelial ion transport.
Symptomic and asymptomic infections of Demodex spp. in eye lashes of patients of different age groups. Demodex folliculorum and Demodex brevis were looked for on eyelashes sampled from 481 people, aged 3 through 96. The persons studied were divided into 9 age groups. Magnitude of the infection symptoms was assessed based on macroscopic changes of eye-lid edges and on interviews with patients. An increase of the prevalence of infection and intensification of the symptoms were observed to coincide with the age increase of the persons studied. No significant differences were demonstrated between the infection frequencies of women and men. Symptoms of ocular demodecosis were more frequent only in women of group III (aged 21-30) and group V (41-50) (p<0.05).
The aim of this study was to determine the prevalence of spirochete Borrelia burgdorferi s.l. in ticks Ixodes ricinus and mosquitoes Aedes spp. within the Bukowa Forest, collected between 2000 and 2001. The study covered 215 ticks (193 nymphs and 22 adults) and 947 mosquitoes female of the genus Aedes. Spirochetes of em>Borrelia burgdorferi s.l. were detected in the arthropods studied with the method of indirect immunofluorescence assay (IFA). Positive readings of the immunological reaction were stated in 17.7% of the collected nymphs and adult forms of Ixodes ricinus, and in 0.8% of mosquito females of the genus Aedes. The number of B. burgdorferi observed in a view field (400×) of microscopic preparations of all infected mosquitoes and about 10% of the infected ticks, ranged from 1-10. This number in 50% of the nymphs was from 11-50 spirochetes. View fields of the preparations of the other 50% of nymphs and adult forms featured more then 50 spirochetes. The observed low values of the prevalence and infection intensity of female mosquitoes Aedes spp. compared to ticks suggest that the former do not pose a serious epidemiological threat in the spreading of Lyme disease.
The aim of the present study was to determine the seasonal abundance of ticks, Ixodes ricinus and their infection frequency with spirochetes, Borrelia burgdorferi in wooded areas of the vicinity of the city of Szczecin during 2000-2001. The ticks were collected from April to October. Presence of Borrelia burgdorferi sensu lato was detected with the method of indirect immunofluorescence (IFA). The results showed differences in seasonal activity of ticks within the years of the study. In the year 2000 a single peak of their increased activity was noted, while in the year 2001 no significant changes in the population of Ixodes ricinus were recorded. Borrelia burgdorferi s. l. was detected in 2000 and 2001 in 11.6% and 9.6% of the specimens captured, respectively, which constituted a statistically significant difference. The highest level of infection of Ixodes ricinus in 2000 was observed in April (13.2%), while in 2001 - in July (12.7%). The differences in the prevalence value between respective months of both years were not statistically significant. The results of the present study indicate a high risk factor of acquiring Lyme borreliosis by humans and animals in wooded areas of the Szczecin vicinity.
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