青鱼Mylopharygodon piceus出血病的初步研究

青鱼出血病是危害青色最严重的疾病之一,尤以二龄为甚。通过人工注射免疫后,可使青鱼的成活率由原来20％左右提高至60—90％,个别的可达98.98％。通过病鱼肾脏组织超薄切片电镜观察,首次发现病毒颗粒(直径为50—56毫微米)的存在,经0.15微米孔径的滤膜过滤的病原悬液可反复在鱼体内传3—4代,使健康鱼发病。因此,认为青鱼出血病是病毒引起的疾病。     

THALASSEMIA (MEDITERRANEAN DISEASE) OCCURRING IN FILIPINOS AND CHINESE

Five cases of thalassemia minor in persons of Filipino and Chinese extraction were observed.The occurrence of biliary calculi in two of the patients suggests that this may be a relatively common complication of thalassemia as it is of other hemolytic diseases.     

SUPEROXIDE DISMUTASE IN JUVENILE NEURONAL CEROID-LIPOFUSCINOSIS (SPIELMEYER-VOGT-BATTEN'S DISEASE)

Abstract— The ceroid-lipofuscin pigments found in neuronal ceroid-lipofuscinosis are believed to arise from lipid peroxidation-damaged organelle membranes. In several in vitro systems superoxide dismutase inhibits lipid peroxidation. Erythrocytes and lymphocytes were prepared from ten patients with juvenile neuronal ceroid-lipofuscinosis (Spielmeyer-Vogt-Batten's disease). Copper-zinc and manganese superoxide dismutases were selectively assayed by a direct method on homogenates of the cells. No significant differences were found between the patients, neurological controls and healthy adults.     

DEGRADATIVE DISEASE IN ULVA RIGIDA (CHLOROPHYCEAE) ASSOCIATED WITH ACROCHAETE GENICULATA (CHLOROPHYCEAE)

A destructive disease affecting tank-cultivated Ulva rigida C. Agardh. was characterized by green spots, initially located at the base of the thalli, that spread through the host thallus and gradually caused perforations of the frond. The endophytic filamentous green alga Acrochaete geniculata (Gardner) O'Kelly was identified as the causative agent of the disease. The effects of this infection on the host varied from minor injuries to gross frond destruction. Advanced stages of infection resulted in frond wrinkling and severe tissue loss. These symptoms were caused by a primary compaction of the host cells due to a direct effect of the endophyte followed by secondary bacterial infections that became part of the degradative process initiated by the algal pathogen. Co-cultivation of healthy and diseased fronds resulted in transfer of the infection within 2 weeks; however, attempts to infect the host in the laboratory with actively reproducing suspensions of the endophyte were unsuccessful.     

A DISEASE OF CITRUS RED MITE PANONYCHUS CITRI (McGREGOR) (ACARINA: TETRANYCHIDAE)

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A disease attacked citrus red mite ( Panonychus citri (McGregor)) in laboratory cultures in Sydney. It appeared to be different from a disease reported in this species from the U. S. A.