Corn, wheat, rice, field bean, soybean, cabbage, spinach, lettuce, curlycress, carrot, turnip, radish, tomato, and squash plants were grown to commercial harvest stage using as the substrate, soil pre‐treated with a municipal sewage sludge (1%) containing variable amounts of CdSO4 up to 640 µg Cd/g soil. Observations included injury symptoms, yield decrement, Cd level of diagnostic tissue, and Cd and Zn content of harvested produce. Cadmium‐sensitive plants such as spinach, soybean, curlycress, and lettuce were injured by soil Cd levels of 4–13 µg Cd/g soil; whereas, tomato and cabbage tolerated soil levels of approximately 170 µg Cd/g soil without exhibiting injury symptoms. Rice was tolerant at all levels tested. Leafy plants such as lettuce, spinach, and turnip greens (tops) accumulated 175 to 354 µg Cd/g; whereas, fruit and seed tissue of plants under comparable treatment, with the exception of soybean, accumulated no more than 10 to 15 µg Cd/g tissue. The concentrations for soybean extended up to 30 µg Cd/g tissue. Paddy rice exhibited no ill effects for soil Cd treatments up to 640 µg Cd/g soil. Grain of plants under the 640 µg Cd/g treatment contained 2 µg Cd/g tissue. DPTA‐extractable Cd correlated (r=0.99) with the level of CdSO4 added to the substrate.

Rice plants (Oryza sativa var. ‘Colusa’) were grown to maturity in pots containing a soil (Domino silt loam, pH 7.5, Xerollic calciorthid) amended with 1% sewage sludge enriched with variable amounts of CdSO4 ranging up to 640 µg Cd/g. Two sets of soil cultures were used, one for rice under continuous flood and the other under nonflood conditions. Grain production for rice under flood management was relatively unaffected by the Cd treatment; 25% yield decrement was associated with a treatment of 320 µg Cd/g. Under nonflood management, however, a comparable decrement in grain production was observed with a treatment of only 17 µg Cd/g. The Cd content of mature leaves at early flowering varied from approximately 0.3 µg Cd/g for the controls to 2.8 µg Cd/g for plants receiving the highest Cd treatments. Leaf Cd values were slightly higher under the nonflood culture. The Cd content of the grain under nonflood management was approximately 55% greater than that of grain under flood management. The Cd content of mature leaves correlated with grain production (r = 0.872***) for rice produced under either flood or nonflood culture. Chemical analysis of saturation extracts revealed greatly reduced Cd concentrations in soil solutions under flood management which may account for the greater tolerance of the cultivar to soil Cd under flood culture. This reduced availability of Cd in flooded soils is attributed to precipitation of CdS.

No abstract

Early diagnosis and successful antimicrobial therapy have diminished the frequency of embolomycotic aneurysms, but infected aortic and small vessel aneurysms, arteriosclerotic plaques, and prosthetic grafts are becoming more common. A broad spectrum of pathogens, including Staphylococcus, Salmonella, Enterobacteriaceae, Pseudomonas aeruginosa, and some unusual organisms, are associated with this change. We treated four patients (three with abdominal aortic aneurysms and one with a prosthetic graft) with arterial infections caused by Listeria monocytogenes. Only seven other cases have previously been recorded in the world literature. Infection is suspected when a palpable or radiographically defined aneurysm is present with an otherwise obscure febrile illness. In about one-third of patients, blood cultures have yielded the pathogen. Newer imaging techniques have helped confirm the diagnosis. These infections are best managed by surgical resection in combination with long-term, appropriate antimicrobial therapy with ampicillin or sulfonamides. Unlike other adult listerial infection, except endocarditis, in arterial infection, immunosuppression and malignancy are not predisposing factors.

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