PubMed Health⌕ Search

Biomedical subjects

M C Wang

Publications and source records attributed to M C Wang.

At least 145 records · Page 8Linked to original sources
PubMed1978

Immunochemical detection of serum prostatic acid phosphatase. Methodology and clinical evaluation.

An immunochemical method for detection of prostatic acid prosphatase is described. Purified acid phosphatase was isolated from cancerous human prostate. A specific antiserum to the purified enzyme was produced in rabbits. The antiserum to postatic acid phosphatase did not react with acid phosphatase originating from other tissues. A counter immunolectrophoresis, utilizing the specific antibodies and a chemical staining technique, has been developed and clinically evaluated. Sera from patients with prostatic carcinoma (6/20 of stage B, 27/49 of stage C, and 98/125 of stage D) gave positive results. Sera from 19 patients with benign prostatic hypertrophy, from 89 patients with other tumors, from 12 patients with Gaucher's disease, from 107 healthy volunteers, and from 50 normal age-matched men all gave negative results. The sensitivity of this method was 0.4 IU of enzyme activity or 20 ng per ml of prostatic acid phosphatase protein. Further clinical evaluation of patients in the early stage of prostatic cancer and of patients undergoing chemotherapy is in progress.

Acid Phosphatase↗
PubMed1976

Cellular and humoral immune response to guinea pig infected with Treponema pallidum.

Guinea pigs infected intradermally with Treponema pallidum Nichols strain were examined for the presence of lesions and for cellular and humoral response. Of the 26 guinea pigs (77%) demonstrated darkfield positive lesions between 6 and 20 days after infection. Animals divided into six groups of 4-5 in each were sacrificed between 2 and 24 weeks. The peritoneal exudate cells, obtained 4 days after injection of oil, were examined by the direct and the cells from lymphoid organs by the indirect capillary leukocyte migration method in the presence of 10 and 30 mug/ml of Reiter antigen. The peritoneal exudate cells responded with enhancement of leukocyte migration, reaching significant values between 6 and 24 weeks after injection. The cells from the lymphoid organs showed enhancement of leukocyte migration until the 4th week of infection. Treponemal antibodies, found in all animals, started to appear at the 4th week reaching a maximum titer at the 12th week after infection. The appearance of the antibodies correlated well (p less than 0.05) with the appearance of the enhancement of leukocyte migration. Wassermann antibodies were not detected throughout the 24 weeks of infection. The unique immune responses are discussed in view of the available data concerning natural acquired and experimental syphilis.

Animals↗
PubMed1975

Uptake and metabolism of alpha-monopalmitin by rat lung in vitro.

CO2 production from and uptake of alpha-glyceryl mono (palmitate-1-14C) were studied in an in vitro system using minced rat lung. Monoglyceride radioactivity was readily incorporated into lung tissue lipids. In a time course of 5-120 min, ca. 2.9-21.9% of the initial medium 14C-radioactivity was recovered in tissue lipids, including free fatty acid and monoglyceride, per one g of tissue. From 93 to 72% of the initial radioactivity remained in the medium during the same incubation periods. The ratio of tissue neutral lipid to phospholipid radioactivity decreased from 2:1 at 5 min to ca. 1:2.1 at 120 min. Most of the phospholipid-14C was in phosphatidyl choline, and this accounted for 80% of phospholipid-14C. Analysis of the tissue lipid radioactivity pattern revealed that during early periods of incubation (5-15 min) there was a rapid accumulation of 14C in monoglycerides and free fatty acids, which decreased with increasing incubation time concomitant with increase in radioactivity of tissue phospholipids and triglycerides. During the same time course, 6.5-85.3% of medium-14C was in free fatty acid, indicating the presence of an active alpha-monopalmitin-hydrolyzing system. After 2 hr of incubation, only 1.8% of the initial medium-14C had been oxidized to CO2. Under the same experimental conditions, 14C-alpha-monopalmitin and palmitate-1-14C were almost equally utilized and the patterns of lipid incorporated from both substrates were similar. It is suggested that rat lungs can utilize alpha-monopalmitin in a similar manner as palmitate after the former is hydrolyzed.

Animals↗
PubMed1973

Task analysis in curriculum design: a hierarchically sequenced introductory mathematics curriculum.

A method of systematic task analysis is applied to the problem of designing a sequence of learning objectives that will provide an optimal match for the child's natural sequence of acquisition of mathematical skills and concepts. The authors begin by proposing an operational definition of the number concept in the form of a set of behaviors which, taken together, permit the inference that the child has an abstract concept of "number". These are the "objectives" of the curriculum. Each behavior in the defining set is then subjected to an analysis that identifies hypothesized components of skilled performance and prerequisites for learning these components. On the basis of these analyses, specific sequences of learning objectives are proposed. The proposed sequences are hypothesized to be those that will best facilitate learning, by maximizing transfer from earlier to later objectives. Relevant literature on early learning and cognitive development is considered in conjunction with the analyses and the resulting sequences. The paper concludes with a discussion of the ways in which the curriculum can be implemented and studied in schools. Examples of data on individual children are presented, and the use of such data for improving the curriculum itself, as well as for examining the effects of other treatment variables, is considered.

Journal Article↗