Exploring Taiwanese and Turkish high school students’ conceptions of learning biology

The purpose of this study is to compare the conceptions of learning biology (COLB) of Taiwanese and Turkish high school students. In addition, it was investigated whether there is a gender difference in students’ COLB in both countries. The COLB questionnaire was implemented in both countries and students’ COLB were identified. A total of 562 Taiwanese and 546 Turkish high school students participated. The results indicated that the COLB questionnaire was valid and reliable for assessing Taiwanese and Turkish high school students’ COLB. And, a significant difference was found between Taiwanese and Turkish students’ mean scores in four learning conceptions as memorising, calculating and practicing, increasing one’s knowledge and seeing in a new way. Moreover, differences were found between the mean scores of Taiwanese female and male students in memorising and understanding; however, there were no mean differences between Turkish female and male students in COLB factors. In addition, analyses of cross-country comparison with respect to gender in the factors of COLB, there was a statistically significant difference between students’ male and female students of Turkey and Taiwan on the some categories of COLB scores. The research findings were considered for both countries and a discussion was conducted on the reasons for the differences.     

What do Israeli high school students understand about biodiversity? An evaluation of the high school biology programme, ‘Nature in a World of Change’

One of the most serious problems facing our planet is the biodiversity crisis. As a solution to this problem, both scientists and educators have emphasised the need for educating people about how to conserve the Earth’s biodiversity. As a small contribution to this effort, we have designed a learning unit about biodiversity, Nature in a world of change, which has recently been implemented with 74 12th-grade Israeli high-school biology students. This unit consists of two components: an introductory module and a collection of three articles adapted from the primary scientific literature. This paper focuses on an in-depth examination with 25 students participating in the programme’s implementation. The evaluation process includes a self-assessment of prior basic ecological knowledge and a post-test focusing on concepts and issues central to the understanding of biodiversity, such as niche and Simpson’s Index. Analysis of perturbations in a food web (by an invasive species) was a special focus of the assessments, reflecting similar concerns prevalent among the scientific community. The results of this evaluation revealed that students with a solid ecological background could successfully deal with the newly acquired concepts presented in the module and the articles.     

Embryonic induction: Is the Nieuwkoop centre a useful concept?

Regionalisation of the amphibian embryo is classically thought to involve induction by the Spemann organiser, itself induced by the Nieuwkoop centre. This model has now been extended to teleosts, with the identification of a gene that appears to define the zebrafish equivalent of the Nieuwkoop centre.     

Is sociality associated with high longevity in North American birds?

Sociality, as a life-history trait, should be associated with high longevity because complex sociality is characterized by reproductive suppression, delayed breeding, increased care and survival, and some of these traits select for high longevity. We studied the relationship between cooperative parental care (a proxy of complex sociality) and relative maximum lifespan in 257 North American bird species. After controlling for variation in maximum lifespan explained by body mass, sampling effort, latitude, mortality rate, migration distance and age at first reproduction, we found no significant effect of cooperative care on longevity in analyses of species-specific data or phylogenetically independent standardized linear contrasts. Thus, sociality itself is not associated with high longevity. Rather, longevity is correlated with increased body size, survival rate and age of first reproduction.     

Resection for colorectal cancer in the very old: are the risks too high?

Altogether 277 consecutive patients aged 70 or more who were admitted for resection of colorectal cancer between 1975 and 1985 were studied. The postoperative complications and mortality in the 175 patients aged 70-79 were compared with those in the 102 patients aged 80 or more. The overall mortality was 11%. Mortality was significantly higher after resection in the older age group even when deaths from widespread malignancy were excluded from the analysis. After curative resection mortality was 2% (2/120) in the younger group and 7% (4/60) in the older group, but after palliative resection of tumours with local or distant spread mortality was significantly higher, at 21% (9/44) and 38% (12/32), respectively. An equal but high proportion of patients in both age groups suffered major complications, but complications caused significantly more deaths in the older group. The length of stay in hospital was not significantly different between the age groups.Patients should not be denied resection of a colorectal cancer because of age alone, especially if a curative operation is possible. The increased risk of death from major complications, particularly after palliative resection, should, however, be taken into account when an operation on patients over 80 is being considered.     

Brief communication: Is variation in the cranial capacity of the Dmanisi sample too high to be from a single species?

This study uses data resampling to test the null hypothesis that the degree of variation in the cranial capacity of the Dmanisi hominid sample is within the range variation of a single species. The statistical significance of the variation in the Dmanisi sample is examined using simulated distributions based on comparative samples of modern humans, chimpanzees, and gorillas. Results show that it is unlikely to find the maximum difference observed in the Dmanisi sample in distributions of female-female pairs from comparative single-species samples. Given that two sexes are represented, the difference in the Dmanisi sample is not enough to reject the null hypothesis of a single species. Results of this study suggest no compelling reason to invoke multiple taxa to explain variation in the cranial capacity of the Dmanisi hominids.     

Exploring the difficulties of studying futures in ecology: what do ecological scientists think?

In a mainly experimental science based traditionally on hypothesis testing such as ecology, studying futures may be difficult. However, in the last few decades, predicting the consequences of global changes on the dynamics and function of ecological systems has become a major challenge in ecological research. To study how ecological scientists deal with potential difficulties in studying futures, we adopted a reflexive viewpoint on how scientists address the study of ecological futures. To do so we questioned a panel of ecological scientists on their practical involvement and point of view. Quantitative and qualitative analyses of their responses showed that predictions or predictive models were the dominant theme. Many quantitative models, based on statistical correlations, empirical rules or processes have been developed and their methodological limitations explored by the researchers we interviewed. In a small proportion of studies, qualitative scenarios have been elaborated to explore the range of possible futures. Interviewees emphasized the problem of dealing with ecological complexity and multiple future possibilities. Specificities of futures compared to past or present events were not fully identified. In fact, researchers studying futures mainly adopted a reductionist approach, trying to simplify complex ecological systems. But methods and tools promoted by such an approach to science may not always be appropriate to deal with future ecological complexity. Indeed, an emphasis on prediction prevents ecologists from acknowledging the multiplicity and undetermined nature of futures.     

Is the money following the clients with learning disabilities?

For the past decade patients with learning disabilities living in long stay mental handicap hospitals have been resettled in the community. Local authorities have also taken on the care of new patients who would once have been long stay residents. The imperfect data that are available suggest that in England about half the residents in mental handicap hospitals in 1981 are now the responsibility of local authorities; the figures for Wales and Northern Ireland are 38% and 33%. Data on revenue suggest that the savings to the health service are much less--perhaps 9% in Northern Ireland and 3.6% in England, although there have also been capital gains through the sale of hospitals. Existing methods of transferring money from health to local authorities--joint finance and "dowries" for individual patients--do not seem adequately to have compensated local authorities. Moreover, as patients still to be transferred are more severely disabled local authorities will require larger sums--about 26 000 pounds per patient per year plus 39 200 pounds in capital. If the government chooses not to transfer these resources from health authorities it will be switching funds away from learning disabled people to other care groups.     

Is the shoot a root with a view?

Recently, it has been shown that the same sets of genes act in both root and shoot to regulate cell fate and patterning. One gene cassette regulates epidermal cell fate, another cassette regulates ground tissue derived cell fate and organization. Ectopic expression and laser ablation have been used to probe the mechanisms by which these genes perform their tissue and organ-specific functions.     

Is something wrong with the tree of life?

A recent study⁽¹⁾ of sequence data from many different proteins has suggested that contemporary prokaryotes and eukaryotes may have shared a common ancestor as recently as 2 billion years ago (the molecular clock). Strong evidence from the geological record, however, indicates that oxygen-producing microorganisms, perhaps similar to modern cyanobacteria, existed 3.5 billion years ago. The fossil evidence, therefore, suggests that any common ancestor of prokaryotes and eukaryotes must have existed at least 1.5 billion years earlier than suggested by the molecular clock evidence. The discrepancy between molecular and geological evidence for the age of modern cells is considered here, as are aspects of gene descent in the tree of life that might help to account for it.     

Is the ApoE polymorphism associated with dilated cardiomyopathy?

Apolipoprotein E (ApoE) is 34 kDa protein involved in the modulation of cholesterol transport and homeostasis. Polymorphism of the ApoE gene has been implicated in many chronic cardiovascular and neuronal diseases. ApoE epsilon4 allele has been reported to be associated with increased risk of cardiovascular diseases such as myocardial infarction, hypertension, coronary heart disease, etc. Fifty patients with the end-stage dilated cardiomyopathy (DCM) and advanced congestive heart failure were examined in our study. For evaluation of ApoE polymorphism, novel approach of fast screening of ApoE gene polymorphism by combination of PCR and blotting (CVD StripAssay) was used. Individual genotypes were correlated with basic cardiologic clinical parameters. The reported frequency of this allele in Caucasian population is 14.7 %. Our results showed that in patients with DCM frequency of the ApoE epsilon4 allele is 40 %. Frequency of the genotype epsilon2/4 was 58 % and epsilon3/4 was 22 %. Comparison with control Caucasian groups monitored by others clearly revealed that frequency of epsilon4 alelle is increased in patients with advanced stages of DCM. This observation suggests association of ApoE polymorphism with severe form of DCM. Physiological consequences of this observation remain to be clarified.     

Is the ecological belt zonation of the Swiss Alps relevant for moth diversity and turnover?

Mountain ecosystems are traditionally envisioned as elevational belts of homogenous vegetation, separated by intervening ecotones. Recent research has cast doubt on such predictable layering at least in animal communities. We test the link of two a priori defined ecological belt zonations to noctuid moth distributions in the Swiss Alps. Predictions, in particular, were a coincidence of proposed ecotones with increased range endpoint frequencies and with increased species turnover or species richness between equidistant elevational bands. Using >320,000 distributional records for >500 noctuid species, we found no support for these three predictions despite several contrasting analytical approaches. Concurrent with recently published vertebrate data, we conclude that simple ecological belt zonations are unrelated to the moth communities found along mountain slopes. Rather, species are distributed idiosyncratically following their specific niche requirements. Additional rigorous evidence, particularly comparing insect clades spanning a spectrum of host-plant relationships, may be required to support the relevance of the ecological belt concept in structuring mountain ecosystems beyond tree and plant communities.     

The product environmental footprint communication at the crossroad: integration into or co-existence with the European Ecolabel?

The International Journal of Life Cycle Assessment - Since 2013, the European Commission (EC) is developing and testing the Product Environmental Footprint (PEF)—a product evaluation method,...