Samuel Townsend

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Since Bensley's ( 1898) classical description of the specialized cell types in the gastric mucosal epithelium much uncertainty has existed concerning their life history. Grant ('45), Stevens and Leblond ('53), Hunt ('57) and Messier ('60) observed that both surface and mucous neck cells arise from the proliferation of cells in the neck region of the fundic(More)
Colonic organogenesis in rats was studied using light microscopic techniques for the demonstration of mucosubstances, glycogen, and connective tissue fibers. Crypts began as intraepithelial spaces which were in continuity with the colonic lumen. The cells forming the floors of these invaded the nonsulfated acid glycosaminoglycan-rich mesenchyme as the(More)
Blood glucose, hepatic glycogen, and mean carotid blood pressure were determined in anesthetized Sprague-Dawley rats receiving an i.v. infusion of Compound 48/80, pilocarpine, or Ringer's solution as a control. Histochemical determinations of the integrity and number of hepatic mast cells and hepatic glycogen content also were performed at the light(More)
Hypertrophic scar tissue has been observed to soften and thin following Z plasty without removal of any of the scar tissue. Histochemical studies of tissue before and after Z plasty showed that abnormally sulfated mucopolysaccharides were replaced by normal acid mucopolysaccahrides within 14 days. Collagen in hypertrophic scar appeared in nodules and fibers(More)
Specific alterations in the microvascular and connective tissue compartments of the hemopoietic microenvironment have been examined during erythropoietic regeneration and suppression in the murine spleen and bone marrow using in vivo microscopic and histochemical methods. The results have confirmed the concept of specific hemopoietic microenvironments and(More)
Social network analysis is a prominent approach to investigate interpersonal relationships. Most studies use self-report data to quantify the connections between participants and construct social networks. In recent years smartphones have been used as an alternative to map networks by assessing the proximity between participants based on Bluetooth and GPS(More)