BEN (BioSciEdNet): A Digital Library of the Biological Sciences for Biology Teaching

2007 ◽  
Vol 44 (06) ◽  
pp. 44-3019-44-3019
2012 ◽  
Vol 11 (3) ◽  
pp. 209-215 ◽  
Author(s):  
John D. Coley ◽  
Kimberly D. Tanner

Many ideas in the biological sciences seem especially difficult to understand, learn, and teach successfully. Our goal in this feature is to explore how these difficulties may stem not from the complexity or opacity of the concepts themselves, but from the fact that they may clash with informal, intuitive, and deeply held ways of understanding the world that have been studied for decades by psychologists. We give a brief overview of the field of developmental cognitive psychology. Then, in each of the following sections, we present a number of common challenges faced by students in the biological sciences. These may be in the form of misconceptions, biases, or simply concepts that are difficult to learn and teach, and they occur at all levels of biological analysis (molecular, cellular, organismal, population, and ecosystem). We then introduce the notion of a cognitive construal and discuss specific examples of how these cognitive principles may explain what makes some misconceptions so alluring and some biological concepts so challenging for undergraduates. We will argue that seemingly unrelated misconceptions may have common origins in a single underlying cognitive construal. These ideas emerge from our own ongoing cross-disciplinary conversation, and we think that expanding this conversation to include other biological scientists and educators, as well as other cognitive scientists, could have significant utility in improving biology teaching and learning.


Author(s):  
Pedro Leonardo Guarilha Colli ◽  
Mariana Aparecida Bologna Soares de Andrade ◽  
Vinícius Colussi Bastos

Resumo: Estudos realizados nas últimas décadas indicam que a Biologia vem sendo ensinada de forma fragmentada e descontextualizada nas escolas brasileiras. Dentre os fatores apontados como causa desta tendência, destaca-se a negligência em relação ao ensino de Evolução, que raramente é tratado como o eixo integrador das Ciências Biológicas. Partindo disso, este estudo propõe uma Unidade de Ensino Potencialmente Significativa (UEPS) para a promoção da aprendizagem das ideias fundamentais à formação do pensamento evolutivo e compreensão dos fenômenos e mecanismos biológicos de maneira integrada e contextualizada. A UEPS construída aborda a Evolução por meio das cinco principais ideias evolucionistas do paradigma darwiniano e é sugerida para ser utilizada no primeiro ano do Ensino Médio.Palavras-chave: Ensino de Evolução; Didática da Biologia; Aprendizagem Significativa; UEPS. Evolution as a unifying axis of biological sciences: a teaching unit in the context of biology teachingAbstract: Studies carried out in the last decades indicate that Biology has been taught in a fragmented and decontextualized way in Brazilian schools. Among the factors pointed out as the cause of this trend, the negligence related to the teaching of Evolution stands out, which is rarely treated as the unifying axis of the Biological Sciences. Based on these understandings, this study proposes a Potentially Meaningful Teaching Unit (PMTU) to promote the learning of fundamental ideas for the formation of evolutionary thinking and understanding of biological phenomena and mechanisms in an integrated and contextualized way. The PMTU developed addresses Evolution through the five main evolutionary ideas of the Darwinian paradigm and is suggested to be used in the first year of High School.Keywords: Teaching of Evolution; Biology Teaching; Meaningful Learning; PMTU. 


Author(s):  
Robert M. Glaeser ◽  
Bing K. Jap

The dynamical scattering effect, which can be described as the failure of the first Born approximation, is perhaps the most important factor that has prevented the widespread use of electron diffraction intensities for crystallographic structure determination. It would seem to be quite certain that dynamical effects will also interfere with structure analysis based upon electron microscope image data, whenever the dynamical effect seriously perturbs the diffracted wave. While it is normally taken for granted that the dynamical effect must be taken into consideration in materials science applications of electron microscopy, very little attention has been given to this problem in the biological sciences.


Author(s):  
C. F. Oster

Although ultra-thin sectioning techniques are widely used in the biological sciences, their applications are somewhat less popular but very useful in industrial applications. This presentation will review several specific applications where ultra-thin sectioning techniques have proven invaluable.The preparation of samples for sectioning usually involves embedding in an epoxy resin. Araldite 6005 Resin and Hardener are mixed so that the hardness of the embedding medium matches that of the sample to reduce any distortion of the sample during the sectioning process. No dehydration series are needed to prepare our usual samples for embedding, but some types require hardening and staining steps. The embedded samples are sectioned with either a prototype of a Porter-Blum Microtome or an LKB Ultrotome III. Both instruments are equipped with diamond knives.In the study of photographic film, the distribution of the developed silver particles through the layer is important to the image tone and/or scattering power. Also, the morphology of the developed silver is an important factor, and cross sections will show this structure.


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