Design of an enquiry-based ‘Practical Only’ course for the teaching of basis skills in first year Biology

First year Biology teaching at the Callaghan Campus of the University of Newcastle has undergone a significant reorganisation in 2006. The rearrangement was conducted with the aims of increasing flexible delivery, improving student learning, reducing overall teaching effort, targeting teaching effort to biology majors and standardising course delivery throughout the university campuses. Key to the reorganisation has been the separation of the practical and lecture components of first year into distinctly separate courses. The practical course runs only in semester 2 and is compulsory for students that intend to graduate with a major in biology. Students that do not intend to continue their biology studies past 1st year are not required nor expected to enrol in the course. Separation of the courses has allowed a renewed focus on basis skills including laboratory and field techniques, the scientific method and practice, report writing and personal interaction. In this paper we present the design of this practical course and explain the process and logic we have used in its construction. Skill acquisition is situated in authentic learning contexts, employing the University campus as a unifying theme. Through an enquiry- based approach, students learn how to think as scientists, posing and testing questions rather than ‘doing the experiment’. The process of building and reinforcing skills (scaffolded learning) and the use of assessment & peer interaction to facilitate the learning process is discussed

Active region formation through the negative effective magnetic pressure instability

The negative effective magnetic pressure instability operates on scales encompassing many turbulent eddies and is here discussed in connection with the formation of active regions near the surface layers of the Sun. This instability is related to the negative contribution of turbulence to the mean magnetic pressure that causes the formation of large-scale magnetic structures. For an isothermal layer, direct numerical simulations and mean-field simulations of this phenomenon are shown to agree in many details in that their onset occurs at the same depth. This depth increases with increasing field strength, such that the maximum growth rate of this instability is independent of the field strength, provided the magnetic structures are fully contained within the domain. A linear stability analysis is shown to support this finding. The instability also leads to a redistribution of turbulent intensity and gas pressure that could provide direct observational signatures.Comment: 19 pages, 10 figures, submitted to Solar Physic

Magnetic Field Generation in Stars

Enormous progress has been made on observing stellar magnetism in stars from the main sequence through to compact objects. Recent data have thrown into sharper relief the vexed question of the origin of stellar magnetic fields, which remains one of the main unanswered questions in astrophysics. In this chapter we review recent work in this area of research. In particular, we look at the fossil field hypothesis which links magnetism in compact stars to magnetism in main sequence and pre-main sequence stars and we consider why its feasibility has now been questioned particularly in the context of highly magnetic white dwarfs. We also review the fossil versus dynamo debate in the context of neutron stars and the roles played by key physical processes such as buoyancy, helicity, and superfluid turbulence,in the generation and stability of neutron star fields. Independent information on the internal magnetic field of neutron stars will come from future gravitational wave detections. Thus we maybe at the dawn of a new era of exciting discoveries in compact star magnetism driven by the opening of a new, non-electromagnetic observational window. We also review recent advances in the theory and computation of magnetohydrodynamic turbulence as it applies to stellar magnetism and dynamo theory. These advances offer insight into the action of stellar dynamos as well as processes whichcontrol the diffusive magnetic flux transport in stars.Comment: 41 pages, 7 figures. Invited review chapter on on magnetic field generation in stars to appear in Space Science Reviews, Springe