Consequences of sulphate-reducing bacterial growth in a lab-simulated waste disposal regime

Summary Experiments are described which investigate corrosion of forged 0.2% carbon steel in the presence of sulphate reducing bacteria (SRB). Cultures of a thermophilic bacteriumDesulfotomaculum nigrificans were mixed with bentonite and synthetic groundwater to simulate a bacteria-contamined backfill, and placed in contact with carbon steel disc specimens in perspex cells at 50°C under anaerobic conditions. The rates of corrosion were monitored by electrochemical techniques, together with changes in near field redox potential. After 340 days the nature and extent of any corrosion was measured and the SRB content of the bentonite determined. Recovery of relatively large numbers of bacteria after about one year incubation in an alkaline (pH 9.5) medium confirmed the pH tolerance of the strain. Enhanced corrosion (three times the rate of the control) occurred in at least two of the five cells that contained SRB despite the nutritionally poor environment which existed in the bentonite gel.     

Particulate-bound pigment ofSerratia marcescens (Chromobacterium prodigiosum)

Résumé Le broyage mécanique deSerratia marcescens pigmentés produit un liquide rouge clair. Après centrifugation à 105 000×g, le pigment se sédimente sous forme d'un agglomérat rouge et la phase liquide reste incolore. La courbe du matériel de l'agglomérat remis en suspension montre à l'ultracentrifuge un seul sommet coïncidant avec le pigment.S. marcescens non pigmentés ne produisent pas d'agglomérat après broyage et centrifugation et donnent une courbe différente à l'ultracentrifuge.     

The sodium and potassium of bone mineral

Zusammenfassung Fraktionierungsexperimente an Knochenpulver zeigten, dass das Kalium in verdünnter Säure leicht und fast vollständig löslich ist. Ein wesentlicher Teil des Natriums bleibt aber, sogar nach stärkster Behandlung mit Säure, ungelöst.     

A comparative study of proteoglycans from bovine lung,trachea, tracheal mucosa,and aorta

Summary Proteoglycans were isolated from bovine lung, trachea, tracheal mucosa, and aorta by dissociative extraction with 4M guanidinium hydrochloride. Fractionation of these tissue extracts by cesium chloride density centrifugation and gel chromatography allowed the isolation from each extract of a high molecular weight fraction consisting mainly of proteochondroitin sulfate and hyaluronic acid.Acknowledgment. This work was supported by a National Heart, Lung, and Blood Institute grant to K. Ehrlich (HL21617).     

Soft Systems Methodology and Systems Maintenance

Business systems maintenance represents a large proportion of the work of IT staff in most organizations. Many methodologies relevant to IT concentrate on systems development and give little attention to systems maintenance. In this paper we discuss the relevance and benefits of the Soft Systems Methodology (SSM) to systems maintenance. Payroll administration is then used to provide an outline illustration of the use of SSM for systems maintenance projects. Aspects of the use of SSM for systems maintenance projects are also discussed.     

Anticonvulsant activity of farnesylacetone epoxide--a novel marine natural product.

A marine natural product, farnesylacetone epoxide, which is chemically related to juvenile hormone, has anticonvulsant properties at nonsedative doses in mice.     

Smooth muscle in the hepatic artery,portal vein and hepatic vein within the liver of the raccoon and guinea pig

Summary The amount and arrangement of smooth muscle in the intrahepatic vessels suggests that the guinea pig would be a good animal model for studying mechanisms controlling intrahepatic portal vein blood flow, while the raccoon would be good for studying hepatic vein mechanisms of control.     

Smooth muscle in the hepatic artery, portal vein and hepatic vein within the liver of the raccoon and guinea pig

The amount and arrangement of smooth muscle in the intrahepatic vessels suggests that the guinea pig would be a good animal model for studying mechanisms controlling intrahepatic portal vein blood flow, while the raccoon would be good for studying hepatic vein mechanisms of control.