Intercellular Migration of Centrioles in the Germarium of \u3cem\u3eDrosophila melanogaster\u3c/em\u3e. An Electron Microscopic Study

A cluster of centrioles has been found in the early Drosophila oocyte. Since the oocyte is connected to 15 nurse cells by a system of intercellular bridges or ring canals, the possibility that the cluster of centrioles arose in the germarium from an intercellular migration of centrioles from the nurse cells to the oocyte was analyzed in serial sections for the electron microscope. Initially, all of the 16 cells of the future egg chambers possess centrioles, which are located in a juxtanuclear position. At the time the 16 cell cluster becomes arranged in a lens-shaped layer laterally across the germarium, the centrioles lose their juxtanuclear position and move towards the oocyte. By the time the 16 cell cluster of cells is surrounded by follicle cells (Stage 1), between 14 and 17 centrioles are found in the oocyte. Later, these centrioles become located between the oocyte nucleus and the follicle cell border and become aggregated into a cluster less than 1.5 µ in its largest dimension. The fate of these centrioles in the oocyte is not known. The fine structure of the germarium and the early oocyte is also described

Exploring the fit between CSR and innovation

An exploration of the fit or space between CSR and innovation is presented, based on the RESPONSE project, a 15-month study involving 60 SMEs throughout Europe. The main practical output of the project was the Social Innovation model, yet a conceptual understanding of CSR and innovation is best advanced through the three hypotheses that constitute the conclusions of the project: H1) The diffusion of CSR should be modelled on the diffusion of innovation; H2) CSR implementation and innovation can be configured to form a virtuous circle; and H3) There is a maturity path toward true integration of CSR and innovation. These three hypotheses inform, respectively, on the background, results and development of the project. H1 is framed within the context of the original European Commission call and proposal; H2 ties in with the Social Innovation model; and H3 is discussed in the light of a short case involving a high-performing SME. Since the hypotheses were the result of the project, we do not attempt to prove them here, but discuss their significance, with the idea that further research and community development will fully evaluate their accuracy.Corporate social responsibility; innovation; small and medium-size enterprises;

A study of the factors of mimicry.

Thesis (Ed.M.)--Boston Universit

Assessing Student Exposure to and Use of Computer Technologies through an Examination of Course Syllabi

A syllabus analysis instrument was developed to assist program evaluators, administrators and faculty in the identification of skills that students use as they complete their college coursework. While this instrument can be tailored for use with a variety of learning domains, we used it to assess students\u27 use of and exposure to computer technology skills. The reliability and validity of the instrument was examined through an analysis of 88 syllabi from courses within the teacher education program and the core curriculum at a private Midwest US university. Results indicate that the instrument has good inter‐rater reliability and ratings by and interviews with faculty and students provide evidence of construct validity. The use and limitations of the instrument in educational program evaluation are discussed

Experiment Definition Using the Space Laboratory, Long Duration Exposure Facility, and Space Transportation System Shuttle

Candidate experiments designed for the space shuttle transportation system and the long duration exposure facility are summarized. The data format covers: experiment title, Experimenter, technical abstract, benefits/justification, technical discussion of experiment approach and objectives, related work and experience, experiment facts space properties used, environmental constraints, shielding requirements, if any, physical description, and sketch of major elements. Information was also included on experiment hardware, research required to develop experiment, special requirements, cost estimate, safety considerations, and interactions with spacecraft and other experiments

CENTRALIZATION VERSUS DECENTRALIZATION OF DECISION MAKING AUTHORITY: EFFECTS ON INFORMATION ACQUISITION AND ECONOMIC EFFICIENCY

Agribusiness,