Phycobilisomes in Anacystis nidulans

Phycobilisomes were demonstrated in Anacystis nidulans by chemical and morphological studies on cells grown in red light. These cells showed a marked reduction in the chlorophyll-phycocyanin ratio owing to a decreased chlorophyll content. Granular structures of approximately 35 nm were observed throughout red light-grown cells, but were most distinct in the peripheral region. The presence of phycobilisomes in cells grown in red light as well as in cells grown in white light is supported by experiments in which glutaraldehyde was used to stabilize the attachment between the phycobiliprotein and the thylakoids, allowing the isolation of both in the same fraction by sucrose density gradient centrifugation.

Kinetics of Single-Layer Graphite Oxidation: Evaluation by Electron Microscopy

Etch-decoration reveals that the rate of removal of carbon atoms exposed at monolayer steps on graphite surfaces is very different from the rate of removal, under identical conditions, at multilayer steps. At 1113 degrees K and a pressure of 1.33 newtons per square meter of oxygen, the rate of oxidation (along the layer planes) is less by a factor of nearly 100 than that at multilayer steps.

Osteochondritis of the Lower End of the Left Femur in a Child aged 5 years

Images

Amniotic Band

Images

Myositis Ossificans Traumatica

Images

Two Cases of Congenital Kyphosis

Images

Case of Severe Comminution of the Femur

Images

Three Cases of Congenital Œdema (Milroy's Disease) in Two Generations of the Same Family

Images

Case of Kienböch's Disease

Images

Fracture of the Transverse Process of the Third Lumbar Vertebra

Images

Congenital Absence of Tibia

Images

Case of Left Unilateral complete Absence of the Tibia

Images