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188162 documents, page 1 of 18817

野生メダカ鱗状の黒色素細胞反応の教材化の試み

高等学校の生物の授業で,『神経による調節のしくみ』を理解させるために,魚の背地反応の観察実習が効果的であるかを実施して検討した。実験材料に野生メダカを用い,背地に対応した体色の変化が色素胞の変化によることを確かめさせた。色素胞の観察は,体色の変化した個体の鱗を剥がし採ってすぐ,4%グルタールアルデヒド溶液で固定したのち顕微鏡で行った。この実験授業を2時間で実施した後,1時間の事後指導で,この実験結果を『神経による生体の反応』として説明した。事後指導後に理解度をテストしたところ,実験観察を行った多くの生徒において,背地反応を『神経による調節のしくみ』の一つととらえる思考活動が高まり,実験観察をしなかった生徒と比べて,神経系の反応の特徴を理解できる学習効果が認められた。 これらのことは,メダカの黒色素胞の形態変化が,体色の変化の直接的原因であることを理解できるほか,動物の神経系による調節機構の理解につながる簡便で効果的な教材であることを示している。...

裏表紙

(1996)

Produtividade em hospitais de acordo com alguns indicadores hospitalares

Dos equipamentos utilizados pela área de saúde para provisão de cuidados assistenciais, os hospitais certamente são preferidos tanto pela população como também pelos profissionais da área. Isto ocorre devido às facilidades e segurança que oferecem face à concentração de recursos humanos e tecnológicos. Este fato, porém, representa custos elevados que devem ser amenizados com aumento da produtividade e da qualidade. Em relação a aspectos como gestão de qualidade, produtividade, dimensionamento...

Ultrastructure of adhesion and movement of the tetraspores of Gelidium Lamour (Geldiaceae; Rhodophyta)

The outer part of the tetraspora cell wall in Gelidium crinale (Turner) J.V. Lamour. and G. spathulatum (Kutz.) Bornet is morphologically described in relation to the movements and displacement of these spores when they settle on a substratum. We also describe the mechanism of adhesión and the transformations undergone by this mechanism over time. The cell wall shows a network of fibrillar threads embedded in abundant mucilage. The deformations that tetraspores undergo show that the cell wall...

Oscar Hijuelos plays songs of Sisterly Love

La concesión de un Premio Pulitzer representa, cuando menos, la popularización del galardonado; sin embargo, el futuro de la obra en cuestión, desvanecido su momento de gloria, puede no pasar de una referencia bibliográfica más. Cuando en 1990 se concedió el Pulitzer a The Mambo Kings Play Songs of Love su autor apenas si era (re)conocido en el mundo de las letras. Su primer libro OurHouse in the Last World (1983) ya apuntaba algunos de los problemas que aparecerán en obras sucesi...

Field inversion gel electrophoretic analysis of Legionella pneumophila strains associated with nosocomial legionellosis in children.

Two nosocomial cases of Legionnaires' disease occurred in children. Legionella pneumophila serogroup 1 was isolated from both patients and 30 of 39 plumbing system sites in the hospital. The patient and hospital environmental isolates yielded identical field inversion gel electrophoretic patterns which differed from patterns observed with epidemiologically unrelated strains.

SUSY GUTs contributions and model independent extractions of CP phases

We consider the origin of new phases in supersymmetric grand unification model, and show how significant new contributions arise from the gluino mediated diagram. We then present a more general model independent analysis of various modes of B-decays suggested previously for measurement of the CKM phases and point out what they really measure. It is in principle possible to separate out all the phases.

The kinematics of the swing phase obtained from accelerometer and gyroscope measurements

The kinematics needed to calculate the knee moment during the initial swing phase were obtained from a set of eight leg-mounted uni-axial accelerometers and two gyroscopes. The angular and linear accelerations of shank and thigh were calculated from the signals of two accelerometers mounted on each of the leg segments directed tangentially and radially to the movement. The angular velocities of shank and thigh were measured by the gyroscopes. The absolute angles of shank and thigh were obtain...

Molecular basis of the magnesium deprivation response in Salmonella typhimurium: identification of PhoP-regulated genes.

The PhoP-PhoQ two-component system is essential for virulence in Salmonella typhimurium. This system controls expression of some 40 different proteins, yet most PhoP-regulated genes remain unknown. To identify PhoP-regulated genes, we isolated a library of 50,000 independent lac gene transcriptional fusion strains and investigated whether production of beta-galactosidase was regulated by PhoP. We recovered 47 lac gene fusions that were activated and 7 that were repressed when PhoP was express...