Otomastoiditis por Tsukamurella tyrosinosolvens, en un paciente HIV positivo / Tsukamurella tyrosinosolvens, otomastoiditis in an HIV positive patient

Tsukamurella spp. es un bacilo gram positivo, aeróbico, catalasa positivo, no móvil, no esporulado, que pertenece al orden de los actinomicetales. Los géneros incluidos en este orden son Nocardia, Gordonia, dietza, Skermania, Williamsia, Turicella, Streptomyces y Rhodococcus. Otros géneros relacionados son Corynebacterium y Mycobacterium. Las infecciones por esos microorganismos se han asociado con neumopatías crónicas, inmunodepresión (leucemia, tumores, infección por el HIV) e infecciones postoperatorias de heridas. Se notificó la presencia de tsukamurella en hemocultivos asociada al uso de sondas o catéteres, otros dispositivos médicos y en casos individuales de tenosinovitis necrosante con abscesos subcutáneos, infecciones óseas y cutáneas, meningitis, peritonitis y conjuntivitis y también como germen colonizante. Se presenta un caso de otomastoiditis en un paciente HIV positivo causado por este germen.

Pulmonary Nocardiosis in a Patient with Lupus Nephritis / 대한류마티스학회지

Nocardiosis is uncommon in healthy people, but occurs as an opportunistic infection in patients with connective tissue disease, solid organ transplantation, lung disease, malignancies, and the acquired immune deficiency syndrome (AIDS). Nocardia is a gram positive, variably acid-fast aerobic bacterium of the family Nocardiaceae characterized by branching and filamentous growth, with distinctive aerial hyphae. In systemic lupus erythematosus (SLE) patients, immunosuppressiion with cytotoxic drugs or corticosteroids, proteinuria, renal insufficiency, and active SLE itself are known as risk factors for serious bacterial infections and opportunistic infections. We report a case of pulmonary Nocardiosis in patient with lupus nephritis treated with cyclophosphamide and high dose corticosteroid.

Study on production of acrylamide by microbial method (I)--Culture of bacterium cells and expression of high activity of nitrile hydratase / 生物工程学报

The cultural conditions for the growth of Norcardia cell were studied in this paper. Controlling pH value, adding nutrient and optimizing the quantity of inducer during cultivation, the activity of nitrile hydratase reached 6567 u/mL (culture medium), which was the highest value appeared in native journals. In the farther hydratase experiments, no by-product, crylic acid, was detected. It showed that the activity of amidase was not promoted obviously while the activity of nitrile hydratase was increased greatly. The results set a strong foundation for the industrial application and the research on new technology.

Cultivation of a nocardioform acid-fast chemoautotrophic bacterium from armadillo tissues infected with Mycobacterium leprae.

A nocardioform bacterium was isolated from the spleen tissue of an armadillo infected with M. leprae and easily propagated in pure culture in mineral salt medium supplemented with only simple C and N sources (e.g., liquid paraffin, tetradecane, ammonium salts, urea, asparagine, gelatin, xanthin, hypoxanthin etc.). Complex organic substances, e.g., tyrosin, casein, peptone, meat extract, egg proteins, serum, blood, yeast extract as well as medium 199, did not support the growth of this organism. Microscopically, the organism consisted of acid-fast, long, slender rods which originated from long, fragmented hyphae, or sporulating mycelial tufts; it was acid-fast (at less than 4.0% H2SO4) which was pyridine-susceptible. It produced DOPA-oxidase and Catalase and was lysozyme resistant; this grew best under reduced O2 tension, at pH 7.0 to 8.0 and 28 degrees C. Serologically, it appeared to be only weakly related to the prototype human multibacillary leprosy-derived (reference) nocardioform strain, Nocardia brasiliensis and N. caviae, but was variably related to several mycobacteria strains.