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The thymocyte subpopulation was obtained by physical adhesion on glass- and cotton-wool. The characteristics of these cells was close to that of "light" thymocytes which were isolated by density sedimentation. The optical parameters of these cells and their cortison-sensitivity are analyzed. The addition of serum or bovine albumine essentially diminished thymocyte adhesion.
25% of 315 tested subjects exhibited skin reactions when patch tested with mineral wool. Coating of the mineral fibres with phenol-formaldehyde did not influence the skin reactions. The reactions seem to be induced mechanically, as the mineral without the fibres did not give any reactions. No allergic reactions to the chemical additives were demonstrated. Macroscopically, the reactions may simulate an allergic response; microscopically, they seem to be toxic, sometimes with prominent spongiosis.
We are reporting a patient with acute leptospirosis whose creatinine phosphokinase was markedly elevated secondary to an associated myositis. In patients presenting with acute hepatitis, an elevated creatinine phosphokinase should suggest the diagnosis of leptospirosis. Our patient's course of illness was made unusual by the appearance of cotton wool spots, previously unreported in leptospirosis as well as by pericarditis in the absence of uremia. This illustrates our ever widening recognition of the clinical manifestations of leptospirosis.
An immunomagnetic separation system has been used to collect CD34+ cells in mobilized blood after treatment with a nylon-wool column. Cell purities were increased from 2.6% preseparation to 94.6% postseparation, with a mean yield 45.2% (n = 4). Forty percent of CD34+ cells separated by the immunomagnetic procedure formed colonies in the presence of hematopoietic growth factors in a limiting dilution assay. Eleven percent of these clones proliferated to over 10(5) cells and contained megakaryocytes.
Little data are available on ambient concentrations of glass fibers which along with other manmade vitreous fibers are receiving increased regulatory attention. The purpose of this study was to measure glass and total respirable fibers around a large fiberglass wool manufacturing plant and a rural area. Samples were collected on mixed esters of cellulose filters using high-volume air samplers at flow rates of 1.2 m3/min. Fibers were counted using a modified NIOSH 7400B procedure. Glass fibers were found in very low concentrations for both areas sampled; 90% of the samples were below the detectable limit of 0.00001 fibers/cc. Average glass fiber concentrations accounted for less than 1% of the total fibers measured. Dispersion modeling was used to estimate ambient glass fiber concentrations around the plant. Predicted and measured results showed relatively good agreement.
BACKGROUND: Cotton wool spots (CWS) result from infarctions of the retinal nerve fiber layer and are seen in a variety of clinical conditions. Most patients with human immunodeficiency virus (HIV) disease, the agent that causes the acquired immune deficiency syndrome (AIDS), demonstrate CWS at some point during their illness. CWS are the most prevalent ocular manifestation found in persons with AIDS. METHODS: A review of the literature was conducted and interpreted to merge a variety of scientific data and clinical studies into a discussion of the etiology, pathophysiology, clinical significance and patient management approaches in patients with AIDS who have CWS. RESULTS: Numerous studies demonstrate a relationship between CWS in patients with low CD4+ lymphocyte cell counts (< 50-100/mm3 of blood), the risk for HIV disease progression, and the development of opportunistic diseases. CONCLUSIONS: While the overall clinical significance of CWS in AIDS is still evolving, it appears that CWS in healthy HIV positive patients have relatively little clinical significance. However, present data suggests that CWS in patients with very low CD4+ counts and advanced HIV disease is a negative prognostic sign. Therefore, CWS in profoundly immunosuppressed patients with low CD4+ counts should alert the optometrist to follow the patient closely.
This study is about enrichment of hemopoietic stem cell concentration in mouse bone marrow by use of a glass wool filtration technique. Maximum stem cell concentration was accomplished when filtration conditions were as follows: (1) support medium supplemented to 15% with fresh serum from syngeneic donors; (2) no incubation time allowed for cells on the columns; and (3) an operational temperature of 24 degrees C. With these conditions, stem cell concentrations were increased 5,4-fold relative to the concentration in untreated marrow.
The prevalence of acute and chronic respiratory symptoms and diseases and ventilatory capacity were studied in 97 textile workers employed in dyeing wool and cotton fibres and in 76 non-exposed control workers. The prevalence of chronic respiratory symptoms was significantly higher in the textile workers compared to controls. The symptoms of occupational asthma were recorded in 7.2 per cent of the textile workers. The prevalence of respiratory symptoms was higher in exposed smokers than in exposed non-smokers. The textile workers employed for more than 10 years had a higher prevalence of all respiratory symptoms than those with a shorter period of employment. The textile workers showed a high prevalence of acute symptoms which developed during work shift. Significant acute reductions of ventilatory capacity tests on maximum expiratory flow-volume curves (MEFV) in textile workers varied from 5.1% for FVC to 12.4% for FEF25. Ventilatory capacity tests in the textile workers before work shift were significantly diminished in comparison to the predicted values. Our data indicate that work in the textile dyeing industry may cause the development of respiratory symptoms and diseases as well as impairment of ventilatory capacity.
In samples of wool from 1,229 differently colored newborn Astrakhan lambs, the total content of melanins and the proportion of pheomelanin in the total melanin were studied by the method of electron magnetic resonance spectometry. An analysis of the corresponding computer data base revealed that the distribution of the samples with respect to the proportion of pheomelanin had at least four characteristic maximums; 1-6, 9-10, 28-29, and 39% of pheomelanin. The former two maximums were characteristic for the brown and Karakalpak sur colors, and the latter two maximums, for red-brown kambar color. White hair tips, characteristic for the sur color, and the proportion of pheomelanin were combined almost independently; therefore the possibility is discussed of classifying these characters as independent phenes, and some variants of sur, as their combinations.
OBJECTIVE: To develop a simple assay using the silica wool filtration (SIFT) procedure to estimate percentage of acrosome-reacted (AR) sperm. SETTING: Private andrology laboratory. MATERIALS AND METHODS: Capacitated sperm processed by the SIFT procedure to remove nonviable sperm and those with broken membrane were acrosome reacted by induction with a calcium ionophore. Following the acrosome reaction, the sample was processed by the SIFT procedure. Sperm concentration and acrosomal status were also determined before and after the SIFT procedure. RESULTS: The SIFT procedure prevented AR sperm from filtering (mean +/- SD, 22.2 +/- 1.9 vs. 9.8 +/- 4.9%). The mean percent of sperm retained in the filter (SIFT assay: 61.8 +/- 21.5%) was significantly higher than the percent of AR sperm estimated by a staining technique (26.4 +/- 7.3%), but they were significantly correlated (r = .34) with each other. The filtration of capacitated sperm prior to induction of the acrosome reaction eliminated, or at least minimized, the possibility of falsely increasing the percent of AR sperm estimated by the SIFT assay. The higher estimate obtained by SIFT assay, therefore, suggests that it may be estimating sperm at various stages that are undergoing the acrosome reaction. CONCLUSION: The findings suggest that the SIFT assay could be used to estimate the percentage of AR spermatozoa.
Granylocyte bactericidal capacity, chemotaxis, hexose monophosphate shung activity (before and after phagocytic stimulus), and quantitative nitroblue tetrazolium reduction and enzyme content were examined in cells obtained by filtration leukaphresis (FL) and continuous-flow centrifugation (CFC). A decrease in the bactericidal efficiency of FL-produced cells compared to that of both normal and CFC-procured granulocytes was found; the decrease was 17% with a cell-to-bacteria ratio of 5:1, and 55% with a 1:1 ratio. Moreover, FL-acquired cells were often vacuolated and consistently contained less acid phosphatase and beta-glucuronidase than did normal granulocytes. When normal cells were incubated for 1-2 hr with nylon wool, 30% of the total acid phosphatase and beta-glucuronidase was released, with no evidence of cell death, thus suggesting degranulation. Similar results were obtained with glass, cotton, or polysulfone plastic fibers. Electron microscopic and peroxidase cytochemical studies of the adherence of normal granulocytes to nylon fibers were also carried out. After 30 min of incubation, cell-to-fiber attachment and cellular aggregation had occurred, although the cells per se appeared normal. After 60 and 120 min, other changes became apparent: (1) a decrease in the amount of cytoplasmic granules; (2) large, intracytoplasmic vaculoles; and (3) extracellular peroxidase on fiber surfaces. We conclude that granulocytes obtained by adherence to nylon fibers show both morphological and biochemical evidence of degranulation and diminished bactericidal capacity, and that these abnormalities may be causally related to decreased granulocyte survival in transfusion recipients.
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