Now showing items 41-50 of 5488
The temporal structure of motivation: III. Identification and ecological significance of ultradian rhythms of intracranial reinforcement
(Elsevier, 1980-10)
Adult male Sprague-Dawley rats were stereotactically implanted with intracranial electrodes aimed at the anterior medial forebrain bundle, and trained to self-administer intracranial stimulation. Following 3 weeks of ...
Suppression of natural killer (NK) cell activity of spleen cells by thymocytes
(Elsevier, 1981-02)
The in vitro influence of thymus cells on natural killer cell activity of spleen cells against prelabeled target cells (YAC-I and RL[male symbol]I) has been studied in syngeneic as well as in allogeneic murine models. In ...
Effectiveness factor calculations for immobilized enzyme catalysts
(Wiley Subscription Services, Inc., A Wiley Company, 1973-09)
The steady state, nonlinear diffusion equations which describe reactions in constrained enzyme solutions are of great interest in many biological and engineering applications. As in other types of nonlinear differential ...
Rapid protein release from Escherichia coli by chemical permeabilization under fermentation conditions
(Wiley Subscription Services, Inc., A Wiley Company, 1992-03-25)
Overall protein release greater than 75% in less than 1 h can be attained by exposing exponentially growing Escherichia coli cells to 0.4 M guanidine plus 0.5% Triton X-100 at 37°C in medium. Cell growth stops immediately ...
Mediation and Modification of the Association Between Hopelessness, Hostility, and Progression of Carotid Atherosclerosis
(Kluwer Academic Publishers-Plenum Publishers; Springer Science + Business Media, Inc., 2005-02)
Hopelessness and hostility are linked to progression of carotid atherosclerosis (PCA). The purpose of this study was to replicate such relations and to evaluate the role of biological pathways involving hyperactivation of ...
Invasive squamous carcinoma of the vulva in young patients
(Elsevier, 1982-04)
Over a 30-year period, 17 patients below the age of 35 with invasive squamous carcinoma of the vulva were identified, 8 of whom (47.1%) had "microinvasive" disease. Venereal diseases and condyloma accuminata were not ...
Virulent mutants of phage P22 : II. Physiological analysis of P22 virB-3 and its component mutations
(Elsevier, 1972-03)
The virulent mutant of phage P22, virB-3, consists of two mutations: K5, which maps in the c2 repressor gene, and Vx, which maps between c2 and c3. Although neither P22 K5 nor P22 Vx is virulent, each of these mutants can ...
Properties of yeast pyruvate decarboxylase and their modification by proteolytic enzymes : I. Stability of decarboxylases from wild-type and mutant strains
(Elsevier, 1968)
High concentrations of inorganic phosphate and ammonium sulfate stabilize yeast pyruvate decarboxylase to heating at 60 [deg] for long periods of time in the presence of TPP and Mg+. When heated at 60 [deg] in phosphate ...
MoFe Cofactor of nitrogenase: Extraction, purification, and characterization
(Elsevier, 1989-08)