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63749 documents, page 1 of 6375

Accessibility in transport/land-use modelling and assessment

The relationship between accessibility and urban density is examined both conceptually and experimentally. A linear relationship between the logarithm of density and centrality, a derivative of accessibility, is calibrated. It is shown that centrality can be used to measure the utility of location in the context of the land-use/transport system. This provides a basis for evaluating land-use/transport changes by using only data readily available from transportation studies.

Membrane-associated assembly of M13 phage in extracts of virus-infected Escherichia coli.

Assembly of coliphage M13 is known to occur as the viral DNA crosses the cytoplasmic membrane, shedding its virus-coded DNA unwinding protein and acquiring from the membrane approximately 2400 copies of the major coat protein. Conditions are described in which extracts of M13-infected E. coli and membranes prepared from such extracts will support virus assembly at a rate equivalent to that of intact cells. Extracts prepared from cells infected with temperature-sensitive M13 mutants in genes 1...

Hepatitis B antigen and antibody in a male homosexual population.

Sera from 600 male homosexual patients were tested for hepatitis B antigen (HBs Ag) and its antibody (HBs Ab). Thirty-one men (5-2%) were positive for HBs Ag. Testing for HBs Ab by immuno-osmoelectrophoresis 33 men (5-5%) were positive. However, sera of 85 patients negative for HBs Ab by routine methods were examined for HBs Ab by radioimmune assay. Thirty (35%) sera were found to be positive. No absolute correlation between the detection of HBs Ag, or previous history of hepatitis, jaundice,...

Purification and properties of myosin light-chain kinase from fast skeletal muscle.

1. A procedure is described for the isolation of myosin light-chain kinase from rabbit fast skeletal muscle as a homogeneous protein. 2. Myosin light-chain kinase is a monomeric enzyme of mol.wt. 77000. Under some conditions of storage it is converted into components of mol.wts. about 50000 and 30000 that possess enzymic activity. 3. The enzyme is clearly different in structure and properties from any other protein kinase so far isolated from muscle. 4. The enzyme is highly specific for the P...

極性相関法による熱中性子炉の反応度測定に関する実験的研究

本論文では黒鉛減速炉を重点的対象として極性相関法を使って反応度測定を行い、その適用性を検討している。理論上は、F.De Hoffman流の確率論的方法で相関関数を論じ、実験上は、極性相関法でSHEのbeta/l測定、炉停止余裕反応度の測定、及び軽水炉JMTRC、JRR-4のbeta/l測定を行い、PNS法とよく一致することを確かめ、また、簡便な条件付極性相関法を提案し、これを吟味する測定を行った。更にPNS法、ロッドドロップ法、中性子源増倍法で大きな負の反応度を測定して空間依存性を調べ、極性相関法によるalphaの一点測定の妥当性を論じた。結論として、炉内中性子計数率ゆらぎに対するガウス分布近似の妥当性が確認できた事実に基づき、極性相関法及び条件付極性相関法が簡便な炉雑音解析法として中性子寿命の長い黒鉛炉に適用できると述べた。...

Compound nucleus formation in the 14N + 16O system

The formation of the 30P compound nucleus by the 14N + 16O incident channel has been studied from E(14 N) = 20 to 60 MeV lab. The population of individual states observed in the d + 28Si and 6Li + 24Mg outgoing channels are compared to predictions of the Hauser-Feshbach statistical model. For incident energies higher than 30 MeV the maximum angular momenta contributing to the fusion process are found smaller than the grazing angular momenta available in the incoming channel.