PubMed Health⌕ Search

Biomedical subjects

A van der Schaaf

Publications and source records attributed to A van der Schaaf.

17 recordsLinked to original sources

[Mastitis caused by Yersinia pseudotuberculosis in a cow].

Subclinical mastitis with a raised somatic cell count was diagnosed in a cow in her fifth lactation. It was caused by Yersinia pseudotuberculosis, which can also infect humans. This is the first time that Yersinia pseudotuberculosis has been isolated from a mastitis sample in The Netherlands. Despite treatment with antibiotics in the dry period, Yersinia pseudotuberculosis was still present in the same quarter in the subsequent lactation. The somatic cell count was still high and milk production was much lower than in previous lactation. The pathogen did not spread to other quarters of the same cow or to herd mates on the farm over a 1-year period.

Animals↗

Elective awake intubation in a patient with massive multinodular goitre presenting for radioiodine treatment.

We present the management of the potential airway complications in a case of massive multinodular goitre treated with radioactive iodine. The patient's trachea was prophylactically intubated, using a fibreoptic technique, to prevent further airway compromise due to thyroid oedema following radioactive iodine treatment. He remained awake and intubated for five days and was extubated when there was no clinical evidence of thyroid oedema as a consequence of his treatment. This approach avoided the considerable risk of thyroidectomy in a morbidly obese patient with airway obstruction. To the authors' knowledge this approach has not been previously described.

Airway Obstruction↗

Independent component filters of natural images compared with simple cells in primary visual cortex.

Properties of the receptive fields of simple cells in macaque cortex were compared with properties of independent component filters generated by independent component analysis (ICA) on a large set of natural images. Histograms of spatial frequency bandwidth, orientation tuning bandwidth, aspect ratio and length of the receptive fields match well. This indicates that simple cells are well tuned to the expected statistics of natural stimuli. There is no match, however, in calculated and measured distributions for the peak of the spatial frequency response: the filters produced by ICA do not vary their spatial scale as much as simple cells do, but are fixed to scales close to the finest ones allowed by the sampling lattice. Possible ways to resolve this discrepancy are discussed.

Animals↗

Modelling the power spectra of natural images: statistics and information.

Power spectra of an extensive set of natural images were analysed. Both the total power in a spectrum (corresponding to image contrast) and its dependence on spatial frequency vary considerably between images, and also within images when considered as functions of orientation. A series of probabilistic models for power spectra enabled calculating the information obtained from prior knowledge of parameters describing spectra. Most information is gained from contrast, 1/f2 spatial frequency behaviour, and contrast as a function of orientation. Variations in spatial frequency behaviour are relatively unimportant. For oriented contrast, a bandwidth of 10-30 deg is sufficient to obtain most information.

Contrast Sensitivity↗

Veterinary experiences as a Japanese prisoner of war and ex-POW along the Burma railroad from 1942 to January 1946.

As a prisoner of war the writer was working for nearly three years in different POW camps, and outside them, along the Burma railway from Thanbyuyzat in southern Burma up to Kanchanabury in Thiland. In the army of the Netherlands-Indian archipelago (KNIL) he had the military rank of reserve horse-doctor. In civilian life he was attached to the Veterinary Institute in Buitenzorg(now Bogor) as a veterinary bacteriologist. His task as a POW became that of meathygienist and supervisor of the living animals in the camps. In this function he diagnosed swine fever in growing pigs which had mainly been fed on the offal of the Japanese kitchen. The acute course and the pathological alterations observed during the post-mortem examinations were identical with those of the Southern-African type of the disease. In slaughter cattle the author diagnosed some cases of lung tuberculosis, one of anthrax, several of rinderpest, some of rhinal granulomatosis and one of foot and mouth disease. In chickens he found NCD (pseudo-fowlpest) and in ducklings a mortal disease which the author then called 'keeling disease' but which he many years later, recognized as virus hepatitis. As assistant bacteriologist and ex-POW he joined the British regimental hospital in Bangkok. Here he had the apportunity to assist the bacteriologist pathologist, Maj. C. R. Peck IMS/IAMC in diagnosing the first case of melioidosis in an ex-POW of the KNIL who died from the sub-acute infection, notwithstanding treatment in the hospital with sulfa-drugs and penicillin.

Concentration Camps↗

The radioisotope spleen scan in the assessment of patients with suspected spleen trauma.

The radioisotope spleen scan was reviewed in 29 patients with suspected trauma of the spleen who had been admitted for observation to a surgical ward. At the time of the study, all patients had stable pulse rates and blood pressures. The scans of six patients showed space defects and, of these, splenic injury was subsequently proven operatively in five patients. As a detector of splenic trauma, the radionuclide scan proved to be reliable. Although the findings of radioisotope scanning are not specific for trauma, the interpretation of the scan in conjunction with other observations increases the accuracy of diagnosis.

Adolescent↗

[Not Available].

Explore the source record for details and available documents.

Allergy and Immunology↗

[Spongy encephalopathy in man and animals (author's transl)].

With reference to new points of view on the pathogenesis and nature of diseases showing microscopically perceptible spongy features as the main lesion in haemalum-eosin-stained sections of particular portions fo the central nervous system in various animals and man, important findings reported in the literature on the subject are reviewed.

Animals↗

[Marginal notes on the paper on tuberculosis among Japanese deer in a deer-park in Goes (author's transl)].

A few marginal notes and a review of the literature on tuberculosis among Cervidae with reference to the outbreak of tuberculosis among Japanese deer in a deer-park recently established in Goes, which was detected by the Animal Health Service in the Province of Zealand in 1971. Particular attention is paid to recent enzootics of bovine as well as of avian tuberculosis. This shows that restrictions on commercial and barter transactions, to be imposed by the authorities, are required. The fact is also stressed that methods of prevention and treatment adopted in ruminants in zoological gardens are contra-indicated. If the breeding of particular species of deer should expand because of the growing demand for venison, some supervision by or in behalf of the authorities would appear to be essential. As the method adopted in the treatment of ruminants is not sure to be definitely successful, this procedure, like vaccination, should be dispensed with.

Animal Husbandry↗