In this paper we characterize the set of all restrictions on the behaviour of a plant that shape the characteristic polynomial of the closed-loop system. These control laws include both classical feedback laws and singular feedback laws. One of the results is the behavioural version of the Youla-Jabr-BongiornoKuEera-parameterization of all stabilizing control laws for a given plant. We also stu...

A 26-month-old male presented with bone marrow failure and dystrophic nail lesions mimicking onychomycosis. There was no skin finding. Treatment with androgen and methylprednisolone was started due to unavailability of a matched-related hematopoietic stem cell donor. After 30 months, transfusion support was required. TINF2 mutation was identified at the age of five and dyskeratosis congenita (D...

Epiphysial chondroblastoma is the name proposed by one of us (1947) for the relatively rare tumour designated by Jaffe and Lichtenstein in 1942 as “benign chondroblastoma of bone” and formerly identified as a “giant-cell tumour” variant (Kolodny 1927, Ewing 1928, Codman 1931). Johnson (1963) actually still classifies this lesion as “enchondromatous giant-cell tumour”. Notwithstanding that its p...

Rev. esp. cir. ortop. traumatol. 2008;52:322-25 Ribbing’s disease is a rare form of sclerosing bone dysplasia, characterized by the exuberant yet benign formation of endosteal and periosteal bone in the shaft of long bones, particularly the tibia and the femur. Although rarely symptomatic, it can cause pain and numbness in the affected limb. Pain is of an inflammatory nature, appears progressiv...

Hairy cell leukemia (HCL) is a relatively rare, chronic B-cell lymphoproliferative disorder characterized by splenomegaly, pancytopenia and bone marrow infiltration by hairy cells with circumferential prominent hairy cytoplasmic projections. Splenomegaly with few atypical lymphoid cells in peripheral blood lead to the examination of bone marrow for morphological findings characteristic of hairy...

Infection of avian bone marrow with strain MC29 leukosis virus in vitro resulted in infection, elaboration of virus, and growth of characteristic cells. Newly liberated virus with the infectious and neutralization properties of strain MC29 agent and growth of the cells were demonstrable 48 hr and 5-6 days respectively after infection. Studies by light and electron microscopy revealed similariti...

Optical reflection spectra of the cartilage/bone interface from hip joints of cows were studied. When comparing to ultrasonic measurement, it was found that cartilage thickness could be extracted using optical reflectance spectroscopy. For thicker cartilage layers, a high reflection for the wavelengths 400-600 was seen, and for thinner cartilage layers, the characteristic spectra of blood and b...

Hypophosphatasia is a congenital disease characterized by deficiency of serum and tissue non-specific alkaline phosphatase activity. The disease occurs due to mutations in the liver/bone/kidney alkaline phosphatase gene. Six clinical forms of hypophosphatasia are recognized. Systemic symptoms of the disease are respiratory complications, premature craniosynostosis, widespread demineralization a...

We report two cases of common bile duct stone formed around a fish bone which migrated from the intestinal tract, along with their characteristic imaging findings. Two patients who had no history of previous operation were admitted because of cholangitis. Percutaneous transhepatic biliary drainage (PTBD) was performed and the cholangiogram showed filling defects with an unusually elongated shap...

enchymal dysplasia of bone that is diagnosed by a characteristic linear cortical hyperostosis with a flowing candle wax appearance (1-3). It commonly affects long bones, usually in the lower limb and on one side of the body. The involvement of flat bones is rare (1, 2). In addition, bilateral involvement is extremely rare, with only one case of long tubular bones with a symmetric distribution r...