A case of left atrial myxoma presenting as interstitial pulmonary edema / 대한내과학회지

Primary neoplasm of the heart is rare. Benign tumors, the majority of which are myxomas, comprise up to 50% of cardiac neoplasms. Although cardiac myxoma is a source of emboli to the central nervous system and elsewhere in the vascular tree, its clinical signs and symptoms may be nonspecific. These nonspecific systemic symptoms and minor embolic phenomena may be overlooked in patients without a previous history of cardiac problems. Thus, we need to recognize the signs of myxoma and begin treatment immediately. We encountered a case of left atrial myxoma, presenting as pulmonary interstitial edema of unknown cause, in a 50-year-old female patient. Excision of a mass located on the left atrium was scheduled but she developed a cerebral embolism that led to her death.

Isolation, Identification and Optimal Culture Conditions of Streptomyces albidoflavus C247 Producing Antifungal Agents against Rhizoctonia solani AG2-2

Streptomyces albidoflavus C247 was isolated from the soil of the Gyeongsan golf course in Korea. Physiological, biochemical and 16S rDNA gene sequence analysis strongly suggested that the isolate belonged to Streptomyces albidoflavus. Preliminary screening revealed that the isolate was active against fungi and bacteria. Self-directing optimization was employed to determine the best combination of parameters such as carbon and nitrogen source, pH and temperature. Nutritional and culture conditions for the production of antibiotics by this organism under shake-flask conditions were also optimized. Maltose (5%) and soytone (5%) were found to be the best carbon and nitrogen sources for the production of antibiotics by S. albidoflavus C247. Additionally, 62.89% mycelial growth inhibition was achieved when the organism was cultured at 30degrees C and pH 6.5. Ethyl acetate (EtOAc) was the best extraction solvent for the isolation of the antibiotics, and 100 microg/ml of EtOAc extract was found to inhibit 60.27% of the mycelial growth of Rhizoctonia solani AG2-2(IV) when the poison plate diffusion method was conducted.