Biomedical subjects
Publications and source records attributed to G Tucker.
To encourage uniformity in the presentation of pharmacokinetic data, a general nomenclature has been developed. The system has wide application. Flexibility is achieved through the use of general variables, constants, qualifying terms, and subscripts. Yet, through the use of implied terms, the symbols describing many common variables and constants are simple.
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Evidence is presented that both X chromosomes are genetically active in clonal cultures of undifferentiated female mouse teratocarcinoma stem cells derived from a spontaneous ovarian tumour. As the cells differentiate in vitro one of the X chromosomes becomes inactivated.
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The binding of biologically active [125I]thyrotropin to purified plasma membranes prepared from bovine thyroid glands was studied. At 4 degrees C, specific binding reached a maximum after 2 h of incubation and a plateau was maintained for up to 20 h. Degradation of [125I]thyrotropin was undetectable after 2 h of incubation and was only 10% of the total after 20 h. At pH 6.0, at which binding was maximal, a single class of binding sites, having a dissociation constant of approx. 25 nM, was evident. Dissociation studies revealed first order kinetics with a half-time of 2-3 min. At pH 7.5, binding curves were complex, suggesting two orders of binding sites with dissociation constants of approx. 200 nM and 80 pM. Further, at this pH, dissociation of the thyrotropin from its receptor was also complex, suggesting the presence of two first order reactions, one with a half-time similar to that seen at pH 6.0 and another with a half-time of 4 h. At both pH 6.0 and 7.5, insulin, glucagon, growth hormone, and prolactin were without effect on [125I]thyrotropin binding. Similar high affinity and low affinity binding sites were seen with porcine thyroid membranes, but only low affinity sites were seen with either rat liver membranes or human cultured lymphocytes.
To study looseness of associations and other theoretically relevant variables of speech pathology, 51 acute psychiatric patients, including 26 schizophrenics, were studied at the acute phase of their disorder by means of a free verbalization interview. The results on these 51 patients during the acute period were: 1. There were clear differences between the schizophrenic patient group and the control patient group, the overall index of deviant verbalizations being significant at the .001 level. 2. Many types of looseness were found in non-schizophrenic patients as well as in schizophrenics. Except at the very mildest levels, however, the variants of overt looseness were strikingly more frequent in occurrence and severe in degree in the schizophrenic group (p smaller than .01). 3. Gaps in communication, vagueness of ideas and blocking, though present to some degree in our control group, were much more common in the schizophrenic sample (p smaller than .001). 4. In the control group of patients, private meanings (including neologisms), repetition and perseveration were extremely rare, and current delusional thinking virtually non-existent. Private meanings and current delusional thinking were conspicuously present in the schizophrenic sample; repetition and perseveration were present to a mild degree in this acute schizophrenic sample. 5. Schizophrenic patients tend to show more looseness of associations when faced with a request to talk about topics not related to their illness.
The Kinesthetic Figural Aftereffect test was administered to 106 psychiatric inpatients to assess styles of stimulus processing in schizophrenia. Three conditions were used: (1) standard stimulus conditions at the acute phase; (2) standard conditions, 7 wk. later, to evaluate stability over time; (3) reversed stimulus conditions to assess kinesthetic figural aftereffect generality under different stimulus conditions. Results indicated that: (1) schizophrenics reduced stimuli, but differences between patient groups were not significant. (2) Kinesthetic figural aftereffect stability over time was shown by nonschizophrenics (p less than .01) but not by schizophrenic and borderline patients. (3) All diagnostic groups reversed kinesthetic figural aftereffect responses under reversed stimulus conditions, e.g., former "augmenters" tended to reduce more under agumenting conditions, suggesting the importance of the specific stimulus conditions. (4) Acute schizophrenics showed a stimulus-governed style. (5) The results raise questions about kinesthetic figural aftereffects as a measure of response style.
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