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Biomedical subjects

H Jónsdóttir

Publications and source records attributed to H Jónsdóttir.

7 recordsLinked to original sources
PubMed2001

Immune parameters of immunised cod (Gadus morhua L.).

The immune response of cod (Gadus morhua L.) is unusual in that specific antibody response is limited or absent. In the present study cod was immunised with haptenated and non-haptenated protein antigen at two different temperatures and the antibody response monitored over a period of 18 months. Other humoral parameters of immunological importance were also analysed, namely total immunoglobulin concentration, anti-protease and spontaneous haemolytic activity. No specific antibody response was detected but increased activity of non-specific anti-TNP antibodies was observed 10-12 weeks after immunisation, irrespective of the antigen used. This antibody activity was attributed to the adjuvant used (FCA) and did not cross react with other antigens tested. Other parameters were probably not influenced by the immunisation but seasonal fluctuations were indicated. The immunoglobulin level appeared to peak in August-September and the anti-protease activity and the haemolytic activity in October-January.

Animals↗
PubMed2000

Application of an electronic nose to predict total volatile bases in capelin (Mallotus villosus) for fishmeal production.

An electronic nose was used as a rapid technique to monitor changes in the headspace gas above capelin (Mallotus villosus) during storage at 0 and 5 degrees C. At both temperatures, refrigeration was compared with an ice/seawater cooling system. At 5 degrees C, the effect of added 0.2% acetic acid was also tested. Electronic nose measurements were compared to measurements of total volatile bases (TVB), gas chromatography of volatile compounds, and sensory analysis. TVB analysis indicated less spoilage in seawater/ice systems than in refrigeration, but the other measurements indicated more spoilage in the seawater system compared to refrigeration. The possibility of using only a few sensors in the electronic nose to predict TVB was studied using partial least squares regression and a saturated generalized linear model. The results reported herein indicate that rapid electronic nose measurements, which require no sample preparation, can be used to predict the TVB value of the raw material stored under different conditions.

Chromatography, Gas↗
PubMed2000

Icelandic norms for the Snodgrass and Vanderwart (1980) pictures: name and image agreement, familiarity, and age of acquisition.

This paper presents Icelandic norms for the widely used pictorial stimuli of Snodgrass and Vanderwart (1980). Norms are presented for name agreement, familiarity, imageability, rated and objective age-of-acquisition (AoA) of vocabulary, and word frequency. The ratings were collected from 103 adult participants while the objective AoA values were collected from 279 children, 2.5-11 years of age. The present norms are in many respects similar to those already collected for other language groups indicating that the stimuli will be useful for further psychological studies in Iceland. The rated AoA values show a high correlation with objective AoA (r = 0.718) thus confirming previous studies conducted with English speaking participants that rated AoA is a relatively valid measure of objective AoA. However, word frequency and familiarity are more closely correlated with rated AoA than with objective AoA indicating that these factors play some role in the ratings. Objective AoA norms are therefore to be preferred in studies of cognitive processes.

Adolescent↗
PubMed1999

Humoral immune parameters in Atlantic cod (Gadus morhua L.) I. The effects of environmental temperature.

The effects of environmental temperature on certain humoral immune parameters in Atlantic cod (Gadus morhua L.) were studied. Serum samples were collected from captive cod, of wild origin, kept at different temperatures for 12 months. It was found that immunoglobulin and natural antibody levels increased with increasing temperature whereas the total serum protein concentration, anti-protease activity, iron concentration, unsaturated and total iron binding capacity decreased with increasing temperature. Haemolytic activity and percentage iron saturation also tended to decrease with increasing temperature although this was not statistically significant.

Adaptation, Physiological↗
PubMed1999

Humoral immune parameters in Atlantic cod (Gadus morhua L.) II. The effects of size and gender under different environmental conditions.

The effects of size and gender on several humoral immune parameters in cod were examined under different environmental conditions. Serum samples were collected from wild cod of different sizes. Two samplings were undertaken: In the spring in relatively cold waters off the north west coast of Iceland and in the fall in relatively warm waters off the west coast of Iceland. Most of the parameters increased with increasing cod size, except the haemolytic activity which decreased. Higher serum protein levels were seen in cod sampled in the fall than in the spring. In cod sampled in the spring there was an apparent difference between specimens < 75 cm in length and the larger specimens with respect to haemolytic activity and iron concentration. None of the parameters were influenced by the gender of the cod.

Adaptation, Physiological↗
PubMed1998

The experience of people awaiting coronary artery bypass graft surgery: the Icelandic experience.

Prolonged waiting for major elective surgery has been a problem in several Western countries for many years. In Iceland coronary artery bypass graft (CABG) surgery was installed in 1986 and this descriptive study was conducted to describe systematically the experience of Icelandic people waiting for CABG surgery with the purpose of gaining information about what nursing services these people need during the waiting period. The survey used a mailed questionnaire developed by the authors. The target population consisted of people awaiting coronary artery bypass graft surgery at the National University Hospital in Iceland, at two predetermined days with a 10-month interval. The return rate was 81.8% (n = 72). Mean time on the waiting list was 5 to 6 months. The waiting for surgery had negative effects on the work and daily life of the majority of the subjects and they were dissatisfied with their health status. Prominent symptoms were fatigue, shortness of breath, chest pain, anxiety and depression. Most patients (86.6%) experienced stress with 28.4% of them reporting a serious level of stress. The majority reported considerable negative influences of their illness on their spouse and family, particularly on their emotional condition. The conclusion drawn is that shortening the waiting period for CABG surgery should be a primary objective; however, that may be unlikely with the present Icelandic health care system. Therefore, helping the individuals and their families live with the lengthy wait is a necessity.

Adult↗