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Biomedical subjects

F Feldhusen

Publications and source records attributed to F Feldhusen.

8 recordsLinked to original sources
PubMed2004

[Audiologic diagnosis in children. Applicability of different speech material].

The aim of our study was to establish bench-mark values for speech intelligibility in noise for children. We also considered which of the two dichotic discrimination tests, Feldmann's or Uttenweiler's, would be most suitable for use within this age group. We examined 102 children aged between 7 and 10 years (second year, primary school), with an average age of 8 years. After confirming normal hearing acuity (examination of the ear, tympanometry and audiogram), speech perception was tested. This was performed with and without noise using the Göttingen Audiometric Speech Test for Children II and the monosyllables of the Freiburger Speech Intelligibility Test. The percentage of word intelligibility was recorded. Furthermore, dichotic hearing was tested using a combination of Feldmann and Uttenweiler dichotic discrimination tests. We rated the percentage of correct word pair repetitions with the correct article. The results showed that the best method for testing speech perception in noise for this age group was the Göttingen Test II for Children. Speech perception below 70% for word intelligibility should be considered as pathologic. For testing dichotic hearing, Uttenweiler's dichotic discrimination test for children was most suitable. In this test values below 80% should be considered as pathologic.

Child↗
PubMed2000

The role of seafood in bacterial foodborne diseases.

Pathogenic bacteria, when present in marine seafood and in fresh cultured products, are usually found at fairly low levels, and where these products are adequately cooked, food safety hazards are insignificant. A few bacteria associated with faecal contamination of seafood continue to pose a large-scale health threat through seafood.

Bacteria↗
PubMed1999

[Seafood transmitted diseases].

This paper reviews seafood related bacterial, viral and parasitological hazards for consumers worldwide. Seafood from Europe is generally regarded as safe. Food safety risks associated with aquaculture products results from contamination with biological agents, which are greater in freshwater and coastal ecosystems than in open seas. Due to the consumption conditions and the intensive investigations of imported products with contamination of pathogenic bacteria there are little seafood risks in Europe. Viral infections are associated with consumption of raw or recontaminated shellfish. There has been speculation that more than 50% of the outbreaks of unknown aethiology are due to viruses. Foodborne parasitic hazards are associated with the consumption of raw (sushi) or insufficiently heated, marinated and salted seafood.

Animals↗
PubMed1997

[Stress response of slaughter pigs in two different access systems to electrical stunning].

Investigations on two batches of 25 pigs each were carried out to characterize two different access systems for electrical stunning by physiological responses such as heart frequency (HF) and the blood constituents lactate and cortisol. All animals were of the same hybrid breeding program. The access race in system A, where the animals are separated was 11 m long. The personnel used different equipments including electrical rods to move the pigs forward. The lairage time after transport was between 1 to 2 h. In system B the animals arrived the evening before slaughter and spent the night in groups in straw-littered lairage boxes. The access race was 3.5 m long. The heart frequencies of the pigs in system A were between 80 and 240 beats/min, in system B the average HF were between 60 and 170 beats/min. In the lairage the HF were at about 113 beats/min (system A) and 66 beats/min (system B). Blood samples were taken immediately after stunning. The lactate concentrations differed by 6 mmol/l (8.6 mmol/l in system A, 2.6 mmol/l in system B). Cortisol was distinctly higher in the blood of the animals from system A (166 ng/ml) compared to system B (126 ng/ml). The results show that the used techniques are suitable to examine stress indicators of pigs under practical conditions. Access systems with long races seem to pose a higher stress than short access ways. The influence of handling (human factor) and management (size of groups, origin of pigs) is equally important. The role of longer resting times in the lairage should be investigated in more detail. This should also include the keeping conditions on the farm where the animals are raised.

Animal Husbandry↗
PubMedDate not supplied

Video-endoscope versus endoscope for paranasal sinus surgery: influence on visual acuity and color discrimination.

Endoscopic and video-endoscopic visual acuity and color discrimination were investigated using a standard disk for testing visual acuity and a color discrimination test. A 1-chip-CCD-Camera (CCC) or 3-chip-CCD-Camera plus digital image processing (digivideo) on the endoscope and a 15 inch high resolution video monitor were used. Color discrimination was investigated by comparing the ability to sort colored disks of low chromatic saturation (desaturated Panel D-15 Test), ranging from yellow to red, under direct vision or via monitor using the same 1-CCC- and 3-CCC-system. Visual acuity deteriorated by 1.58 +/- 0.16 steps (+/- SEM) for the 1-CCC and 1.21 +/- 0.16 steps for the 3-CCC plus digivideo compared to vision through the endoscope (p < 0.001 and p < 0.001). Visual acuity was significantly better for the 3-CCC-video-endoscope compared to the 1-CCC-video-endoscope (p = 0.0045). The difference in color discrimination between the naked eye and the 1-CCC-monitor system was not significant. More mistakes were made with the 3-CCC-monitor system. The impairment of image quality with the video endoscope, which is experienced by many surgeons, is reflected in a marked loss of visual acuity in our experiments. Sharpness and contrast of the video-image are significantly enhanced by the 3-CCC plus digital image processing, compared to the 1-CCC. Color discrimination, however, was not impaired by the 1-CCC, indicating that color perception with the video-endoscope can be very good and may not contribute significantly to the loss of image quality.

Color Perception↗