Biomedical subjects
C Jackson
Publications and source records attributed to C Jackson.
Amphetamine: differential effects on defensive flight and motor behavior in the rat.
As in previous research, hooded rats treated with an acute high dose of d-amphetamine sulfate (5 mg/kg free base) showed a dramatic defensive flight reaction to a novel stimulus (mechanical robot) that did not elicit flight from saline controls. Both the defense response and stereotypy behavior (repetitive movements and oral, licking chewing) were assessed at eight time periods after injection: 1, 15, 30, 45, 75, 105, 135, and 165 min. The defense response peaked early (15-30 min) after injection and showed a significant decline by 75 min, with no reemergence as stereotypy subsided. Stereotypy peaked later (45 min) and did not decline until 105 min. Tests in the absence of the robot provided a control for motor effects of the drug. Whereas stereotypy occurred in both Robot and No Robot conditions, the defense response occurred only in the Robot condition. These results were thought to provide further evidence that the effects of amphetamine on defensive flight could not be attributed to purely motor reactions. Thus, amphetamine-induced defensive flight may be an appropriate pharmacological model of affective psychosis. As such, it may be helpful in establishing differential pharmacological profiles for affective versus motor potencies of potential antipsychotic compounds.
Siphoning from a syringe pump: a cause of sudden overdose.
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Data watch. How do private foundations spend their money? A description of health giving.
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The 5-O-beta-D-galactofuranosyl-containing glycopeptide from Penicillium charlesii. Identification of phosphocholine attached to C-6 of mannopyranosyl residues of the mannan region.
Peptidophosphogalactomannan from Penicillium charlesii contains ethanolamine, presumably linked via phosphodiester to galactomannan (Rick, P. D., Drewes, L. R., and Gander, J. E., (1974) J. Biol. Chem. 249, 2072-2078). These investigations have been extended using 13C and 31P NMR spectroscopy to show that peptidophosphogalactomannan also contains choline and that both ethanolamine and choline are linked through phosphodiester linkages to C-8 of mannosyl residues of the mannan region of peptidophosphogalactomannan. Approximately one-half of the bases derived from ethanolamine, and which are attached to the mannan as phosphodiesters, are released as choline upon treatment with dilute alkali. It was shown that 13C from L-[methyl-13C]methionine is incorporated into methyl groups of mannosyl-6-phosphocholine in vivo. There were no 13C NMR signals from the methyl carbons of either 2-methylaminoethanol (33.3 ppm) or 2-dimethylaminoethanol (45.9 ppm) observed in these experiments even though the major signal was from the methyl carbons of choline (56.9 ppm).
Comparison of radioimmunoassay and the gel filtration technique for routine diagnosis of rubella during pregnancy.
Radioimmunoassay (RIA) for rubella-specific IgM antibodies was compared with haemagglutination-inhibition (HI) in conjunction with gel filtration for the diagnosis of rubella infection in pregnant women during a 1-year period. In total 476 women were investigated of whom 221 were tested for rubella IgM. Both techniques gave positive results with 64 sera, and RIA alone with one additional serum. Difficulties associated with the removal of non-specific HI activity were encountered with four sera all of which were negative by RIA. RIA was found to have practical advantages over the gel filtration method but is at present technically more difficult to perform.
Diabetes: how your patient looks at it.
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Glycine decarboxylase activity in plant tissues measured by a rapid assay technique.
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The psychosocial approach to brain deterioration.
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Photorespiratory nitrogen cycling: evidence for a mitochondrial glutamine synthetase [proceedings].
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Separation of mitochondria from contaminating subcellular structures utilizing silica sol gradient centrifugation.
Discontinuous Percoll density gradients have been developed for the purification of mitochondria, permitting rapid separation under isosmotic and low viscosity conditions. Mitochondria from several etiolated tissues have been successfully separated from contaminating subcellular structures by this method. For potato tuber the ratio of washed to purified mitochondrial protein was 2.6, similar to the increase in specific activity of cytochrome c oxidase following separation. The purification of mitochondria from green leaf tissues on Percoll gradients has reduced chlorophyll contamination of spinach mitochondria from about 70 micrograms chlorophyll per milligram protein to approximately 8 micrograms chlorophyll per milligram protein.The ratio of protein content of the washed mitochondria compared to that in the purified preparation was 7 for spinach and respiratory activity was retained. The physiological integrity and oxidative properties of washed and gradient mitochondria are compared.
Subcellular localisation and identification of superoxide dismutase in the leaves of higher plants.
1. The subcellular location of superoxide dismutase in the leaves of spinach and other C3 plants has been investigated. 2. Most activity appeared to be located within chloroplasts. These organelles contain a cyanide-sensitive (copper-zinc) superoxide dismutase, most of which is located in the stroma although some is bound to the thylakoids. 3. Intact chloroplast fractions also contain a cyanide-insensitive (manganese) superoxide dismutase, but this activity is located on the outside of the chloroplasts and may be adsorbed onto them during isolation. 4. Leaf mitochondrial fractions contain only a small percentage of total leaf superoxide dismutase activity, but there is more than can be accounted for by contamination with chloroplasts. 5. Mitochondria contain both a cyanide-sensitive dismutase, apparently located in the intermembrane space, and a cyanide-insensitive activity, apparently located in the matrix. 6. The microsomal fraction contains no superoxide dismutase activity.
The use of high speed gel filtration for the detection of rubella-specific IgM.
Three new gels, Ultrogels AcA 22, AcA 34 and AcA 44 have been compared with Sephadex G-200 for the detection of rubella-specific IgM. Ultrogel AcA 44 did not achieve an adequate separation of IgM and IgG. Ultrogels AcA 22 and AcA 34 gave clear separation of IgM and IgG but only the latter could be operated at flow rates significantly higher than Sephadex G-200. With rubella convalescent sera fractionation with Ultrogel AcA 34 leads to a 2-4-fold loss of sensitivity for the detection of the first peak of rubella HI activity which is associated with recent infection. This is largely due to the occurrence of specific IgA antibody in the first peak of rubella HI activity after Sephadex G-200 fractionation but not after Ultrogel AcA 34 fractionation.
Promoting written care plans.
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Non-emergency N.H.S. treatment for other E.E.C. citizens.
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Intramitochondrial localisation of glycine decarboxylase in spinach leaves.
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Hepatic hemangioendothelioma. Angiographic appearance and apparent prednisone responsiveness.
A 6-month-old girl was seen because of multiple cutaneous hemangiomas, hepatomegaly, and failure to thrive. A liver scan with technetium Tc 99m sulfur colloid showed two filling defects in the left lobe. Diffuse nodular hepatic lesions characteristic of hemangioendotheliomas were disclosed by celiac angiography and confirmed by biopsy. Congestive heart failure, present in many infants with this syndrome, was not manifest. Prednisone was administered, 2 mg/kg, on alternate days. Liver size and cutaneous hamangiomas promptly regressed in size and "catch up" linear growth occurred during six months of treatment. Congestive heart failure did not develop. Sixteen months after treatment, liver size and a second hepatic scan were normal.
Depression of the platelet count after inoculation of mice with L1210 or L5178Y cells.
The inoculation of L1210 or L5178Y leukaemia cells decreased the platelet count of the recipient mouse before extensive infiltration of marrow was expected by either tumour line. The decrease was more pronounced after intravenous inoculation of L1210 leukaemia than after intraperitoneal inoculation. Inoculation of L5178Y cells by both routes caused an initial decrease but the count recovered to 80% of normal before becoming markedly depressed prior to death of the host. Implantation of diffusion chambers containing L1210 cells also decreased the platelet count, which later returned to normal.