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Biomedical subjects

V Jonsson

Publications and source records attributed to V Jonsson.

At least 19 recordsLinked to original sources
PubMed2000

"With the rule" astigmatism is not the rule in the elderly. Reykjavik Eye Study: a population based study of refraction and visual acuity in citizens of Reykjavik 50 years and older. Iceland-Japan Co-Working Study Groups.

PURPOSE: To study refractive state and visual acuity in citizens of Reykjavik 50 years and older. METHODS: 1700 persons were randomly selected from the national population census. 1379 could be located and qualified whereof 1045 participated. Evaluation of refraction was performed using Nidek ARK 900 autorefracto-keratometer. Visual acuity was tested on a Snellen chart. RESULTS: The prevalence of hypermetropia increases with age by 0.3 D in five years. The prevalence of "against the rule" astigmatism increased on average 5.3% and oblique 3.9% in five years. Analysis of corneal astigmatism measured by keratometer shows an "against the rule" change with age. CONCLUSIONS: Hypermetropia increases by age. The prevalence of astigmatism increases and the axis turns to "against the rule". The changes in total astigmatism and corneal astigmatism is almost parallel which might indicate that the "against the rule" change is related to changes in the cornea.

Aged↗
PubMed1981

Immotile-cilia syndrome and the cilia of the eye.

Ten patients with the immotile-cilia syndrome were subjected to an extensive eye examination, which failed to demonstrate any consistent single abnormality. The tests of the retinal function and the aqueous humor dynamics were normal. However, different corneal abnormalities--mostly without clinical significance--were observed in 9 out of 10 patients, suggesting a developmental disturbance.

Adult↗
PubMed1981

Vascular damage in the anterior uvea induced by intravitreal autogenous blood.

The effects of vitreous hemorrhages on anterior uveal vessels were studied. Albino rabbits were injected intravitreally with autogenous blood, plasma, RBCs, iron-dextrin, or Ringer's solution. The vascular permeability was assessed by fluorescein iris angiography, carbon labeling and penetration of peroxidase. Following one injection of blood, aqueous flare and fluorescein leakage from the iris were observed for 40 days. Intense vascular carbon labeling in iridial and ciliary processes was present for 1-40 days and weak-to-moderate labeling in the iris for 9-40 days. Repeated blood injections aggravated the vascular response, showing extravasation of peroxidase and carbon labeling of iridial vessels for 92 days. The most severe vascular damage ensued from iron-dextrin and RBCs. Plasma an Ringer's solution gave no reaction. The authors suggest that the iron-containing degradation products of RBCs induce vascular damage in anterior uvea and disruption of blood-aqueous barriers.

Animals↗
PubMed1977

Semiquantitative determination of Cc and C3 receptors on human lymphocytes by isotope-labelled marker cells.

The number of Fc and C3 receptors on normal B lymphocytes, isolated from blood, was assessed semiquantitatively by a new method in which the marker cells (pretreated sheep erythrocytes) for Fc and C3 receptors are labelled by 99Tc and 51Cr respectively. The mean number of bound marker cells per rosette was assessed simultaneously by measurements of radioactivity. Control studies showed that a measuring system using 1/4 agglutinating titre of antibody on the marker cells is particularly advantageous: (1) Fc and C3 receptors are not demonstrable on T lymphocytes; thus, B lymphocyte fractions with Fc and/or C3 receptors are well-defined. (2) The binding affinity of the marker cells for normal lymphocytes is so weak that the number of bound marker cells per rosette rarely reaches the maximum which was calculated and measured as about 30 marker cells per rosette; thus, the measuring system is sensitive to changes in the number of receptors. (3) By binding of marker cells to lymphocytes bearing Fc as well as C3 receptors it has been demonstrated that interference phenomena between the two marker cells are not operative. Studies of blood lymphocytes from normal human subjects showed B lymphocytes carrying either Fc and C3 receptors as well as a fraction of B lymphocytes having both Fc and C3 receptors. The latter maker up about 6% of the lymphocyte mass. Comparative assessment of the quantitative distribution of these receptors indicates a developmental sequence, B lymphocyte with Fc receptors evidently developing, via B lymphocytes with Fc as well as C3 receptors, into B lymphocytes having C3 receptors only.

Adult↗
PubMed1977

A case of T-cell lymphoma with Sézary cells in the blood and bone marrow accompanied by peripheral T and B lymphocytosis.

A case of T-cell lymphoma occurred in a man, aged 66, whose symptoms started as itching and the appearance of 1-2 cm indurated plaques with central pustules on the skin of the trunk and face. A few months later generalized lymphomas and splenomegaly were present. Investigations of the lymphocytic subpopulations in situ in fresh frozen sections of lymphomas and skin showed only T cells. Samples of blood and bone marrow disclosed lymphocytosis and Sézary cells. Both T and B lymphocytes were definitely increased in the blood. The value of tissue studies in analyzing lymphocytic subpopulations is emphasized as a differential diagnostic aid in classifying lymphomas. A relationship between the T-cell neoplasia and the T and B lymphocytosis to mycosis fungoides and the Sézary syndrome is discussed.

Aged↗
PubMed1977

Distribution of B, T, and O lymphocytes in blood and tissues of normal humans reflecting a kinetic model.

The occurrence of the lymphocyte subpopulations TE, BFc, BC3, BFc + C3, BIg, and O-, percentage as well as absolute, was studied in lymphocyte suspensions from tonsils, abdominal lymph nodes, spleens, bone-marrow aspirates, and at the same time in venous blood. The absolute lymphocyte content (number of lymphocytes per g tissue) was highest in the abdominal lymph nodes, lower in the spleens and tonsils, and lowest in the blood. TE lymphocytes were found in the significantly highest percentage, 60%, in the blood. B lymphocytes, comprising BFc + C3 plus BIg, were present in the highest percentage in the bone marrow: 74%. Tonsils, spleens, and abdominal lymph nodes contained fewer B lymphocytes, and the blood fewest: 39%. A significant correlation was found only between the absolute numbers of T and B lymphocytes. A relationship between the absolute number of T lymphocytes and the total number of B lymphocytes as well as fractions thereof was thus demonstrated in the various tissues and in the blood and also between the blood and the tissue. O- lymphocytes were found in bone marrow, lymph nodes, and spleens, apparently as markerless precursors of other subpopulations. The main conclusion of the study is: In the lymphocytokinetic system the T lymphocytes must play a guiding role as an afferent vector, trigging the B fractions which thus constitute the efferent vector of the system.

Adolescent↗
PubMed1976

mu-chain disease in a case of chronic lymphocytic leukaemia and malignant histiocytoma. I. Clinical aspects.

A 27-year-old woman with proteinuria and normal serum creatinine for 10 years developed chronic lymphocytic leukaemia (CLL) and after further 2 years during treatment with prednisone and chlorambucil a malignant histiocytoma appeared. Free mu-chains were demonstrated in serum, but it is possible that mu-chain disease (mu-CD) and Bence-Jones proteinuria had persisted unrecognized for 12 years, since vacuolated plasma cells were found when the primary bone marrow smear was re-evaluated and no glomerular disorders were found. The clinical findings from the now 11 known cases of mu-CD are reveiwed and the immunochemical findings are reported ain part II (Axelsen et al 1976). The patient's mother died of acute leukaemia at the age of 24. The mother's sister has mammary carcinoma and several members of the mother's line apparently have increased tendency to infections. Of 27 family members, none exhibited immunoglobulin defects, but 10 members of the mother's line had B- as well as T-lymphocytosis and 5 members had leukocytosis.

Adult↗
PubMed1976

Mu-chain disease in a case of chronic lymphocytic leukaemia and malignant histiocytoma. II. Immunochemical studies.

Agarose gel electrophoresis of serum from the eleventh case of mu-chain disease (mu-CD) showed two distinct abnormal bands due to free light chains and kappa-complexes with other serum proteins. This caused diagnostic difficulties on conventional immunoelectrophoresis, and crossed immunoelectrophoresis with intermediate gel is demonstrated as a superior tool for investigation of mu-CD. A simple rocket immunoelectrophoresis method foe mu-CD screening is also shown. The mu-CD protein had alpha-2-mobility and a part of the protein carried kappa-determinants probably due to secondary binding. Preparative ultracentrifugation and size chromatography on serum demonstrated that the mu-CD protein was present in serum in several sizes, the smallest being a dimer of mu-chains. Due to scarcity of material the abnormal protein could not be characterized further.

Adult↗
PubMed1976

Estimation of B- and T-lymphocytes in lymphoid tissue by means of photometry and 51Cr labelled marker erythrocytes.

Some new techniques for estimating B- and T-lymphocytes in lymphoid tissue are introduced. The density of marker erythrocytes on closed chamber incubated sections was estimated by the light transmission in relation to the number of the respective lymphocyte subpopulation, measured on suspensions of eluted lymphocytes. Using 51Cr labelled marker erythrocytes, the number of adsorbed marker erythrocytes per lymphocyte could be estimated from the gamma-irradiation of the section. The number of lymphocytes in the section was determined by the amount of protein in the section compared with the protein amount of a tissue specimen of known wet weight and known lymphocyte content. Furthermore, the number of adsorbed marker erythrocytes per rosette in suspensions of eluted lymphocytes was estimated by means of radioactively labelled marker erythrocytes.

Appendicitis↗
PubMed1976

Transfer factor, sarcoidosis and cellular immunity.

A 27-year-old man with disseminated sarcoidosis was treated with repeated injections of Transfer Factor. Grossly abnormal immunological in vitro parameters were normalized, but in spite of these changes the clinical condition deteriorated.

Adult↗
PubMed1975

Influence of prednisone and cytostatics on human blood B-, T- and O-lymphocytes in diseases.

B-, T- and O-lymphocytes detected as EAC-, E- and non-rosette forming lymphocytes were investigated in venous blood in 49 patients with connective tissue diseases, psoriasis and chronic lymphogenous leukaemia (CLL) during treatment with either prednisone alone, prednisone and cytostatic agents or cytostatic agents alone. Prednisone alone did not change the B-, T- and O-lymphocyte counts. Cytostatics alone or in combination with prednisone reduced the B- and T-lymphocyte counts concomitant with a significant increase in the O-lymphocyte count. The findings could be explained by assuming that cytostatics disturb the immunological functions of the lymphocytes and finally deprive the cells of their B- and T-markers. The optimal immunosuppressive treatment with cytostatic agents may be associated with a certain reduction of B- and T-lymphocytes which may be used as a guideline for dosage.

Adolescent↗