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Biomedical subjects

C Palmer

Publications and source records attributed to C Palmer.

At least 145 records · Page 8Linked to original sources
PubMed1979

Interpositus and fastigial unit activity during sleep and waking in the cat.

Fine wire microelectrodes were used to record single unit activity from two of the intracerebellar nuclei, the interpositus and fastigius, during the sleep-waking cycle. The mean rates, interspike interval distributions and patterns of firing as revealed by autocorrelograms, were investigated. For each stage of the sleep-waking cycle and for as many units as possible the constancy of these measures was examined throughout several sleep cycles. Twenty-four interpositus units were recorded throughout at least one complete sleep-waking cycle. The firing rate of these units in paradoxical sleep without REM was equal to that in quiet wakefulness and greater than that occurring during slow wave sleep. The highest firing rates occurred during REM periods. Some interpositus units were found to have apparent eye movement related activity during REM periods but there was no correlation with waking eye movements. Eleven fastigial units were investigated throughout the sleep-waking cycle. At least half of these units were found to have rhythmic bursting activity during paradoxical sleep which did not appear to be tightly linked with REM periods. Fastigial and interpositus units were found to have slow shifts in their 'background' level of firing which occurred independently of the sleep-waking cycle. The results of these experiments are discussed in relation to the known inputs to the nuclei and in relation to previous studies on other groups of neurons during sleep and waking.

Animals↗
PubMed1978

B-cell leukemia-lymphoma with striking resemblance to Burkitt lymphoma in a 70-year-old woman.

A 70-year-old woman developed acute leukemia and a serum IgM spike. She entered complete remission with an adriamycin, vincristine, cytosine arabinoside, and prednisone combination. Bone marrow remission was maintained with intermittent cytosine arabinoside; however, she developed large skin nodules which partly remitted following adriamycin, vincristine, cyclophosphamide, and prednisone combination. They very rapidly recurred, and she died soon after. Autopsy revealed extensive tumor in the abdomen, pelvis, and thoracic cavity, but no bone marrow involvement. Histology revealed a "starry sky" appearance. Cytology showed undifferentiated cells with vacuolated cytoplasm resembling Burkitt lymphoma cells. Peroxidase and esterase stains were negative. There was strong pyroninophilia and the periodic acid-Schiff reaction showed granular activity in the cytoplasm. Electron microscopic appearances also resembled Burkitt lymphoma. Cytogenetic studies were normal, with no Ph1 chromosome. Immunofluorescence demonstrated surface IgM and a little IgA. 3H-thymidine incorporation was high, indicating rapid growth. Dibutyral cyclic adenosine monophosphate (cAMP) stimulated growth, which was further evidence of the lymphoid origin of the tumor. The close resemblance of this tumor to Burkitt lymphoma emphasizes the difficulties in systematically classifying the lymphomas.

Acute Disease↗
PubMed1976

Scanning electron microscopy of cell surfaces following removal of extracellular material.

The application of scanning electron microscopy to the study of cell surfaces is limited in intact tissues, because extracellular material may often obscure the details of nonluminal surfaces. To remove connective tissue elements we have treated human skin and both kidney, and an autonomic ganglion of the rat with hydrochloric acid and collagenase. Regional variations in the basal surface of the nephron are noted following removal of the basement membrane. The basilar interdigitations of the cells of the proximal tubule appeared as parallel ridges encircling the tubule. Ridges on the parietal epithelium of Bowman's capsule were randomly arranged and alternated with smooth surfaces. The dermal surface of the human epidermis has an alveolar or honeycomb appearance due to the elevation of the epidermal ridges and numerous pits for the dermal pegs. At higher magnifications the basal surface of cells of the stratum germinativum possessed numerous and irregular projections. Neurons with their processes are evident in the autonomic ganglion. The soma of the neurons are enclosed by flattened satellite cells. Irregular spaces between opposed satellite cells are interpreted as regions for the passage of processes related to the ganglion cells. Nodes of Ranvier were clearly seen along nerve fibers. Some pitting of the nerve fibers was also noted. The HCl-collagenase method has the advantage of the removal of collagen and basement membrane while preserving the structural integrity of the cell surface.

Animals↗
PubMed1975

Holoprosencephaly: birth data, benetic and demographic analyses of 30 families.

Thirty families were studied to determine genetic and evnironmental factors involved in holoprosencephaly. Those with chromosomal abnormalities were excluded. Many factors appear to cluster in proband families, such as mental retardation, mental illness, endocrine disorders, increased twinning and poverty level socioeconomic status. The empiric recurrence risk was 6%. Among 7 with lobar holoprosencephaly, there were 3 females and 4 males, while there were 19 females and 6 males with alobar holoprosencephaly.

Abnormalities, Severe Teratoid↗
PubMed1971

Mental health aspects of shoplifting.

A ten-year follow-up of 886 shoplifters showed clear differences between women and men. Men tended to have previous convictions and to steal books (unknown in women). Of the 532 women nearly one third were foreign-born, and this group comprised 46% of offenders aged 17-30. The peak age among British women was 51-60.First offenders accounted for 80% of the women, and their reconviction rate was 11%; among those with any kind of previous conviction the rate was 50%. The rate of admission to hospital for women shoplifters is three times higher than average.

Adolescent↗