Congenital atresia of the left main coronary artery in an infant

Congenital atresia of the left main coronary artery is a rare occurrence, and surgical revascularizationbypass graft is required. We here report a rare case of congenital coronary anomaly in an infant. A 10-month-old male infant was admitted to the hospital with heart failure symptoms. Echocardiographic examinations revealed mitral valve regurgitation and ischemic changes of the anterolateral papillary muscle and chordae. Coronary angiography showed atresia of the left main coronary artery with a severe hypoplastic left anterior descending artery and a circumflex coronary artery. Unfortunately, sudden cardiac arrest occurred after catheterization and the infant did not recover despite of immediate cardiopulmonary resuscitation. Further studies are needed to find a newer diagnostic method to detect coronary anomaly in an infant, and coronary angiography, if necessary, has to be performed very carefully.     

Beam steering in planar photonic crystal based on its anomalous dispersive properties

INTRODUCTION Photonic crystals (PhCs) are increasingly at- tracting attention due to their ability of controlling light propagation on a wavelength scale, by which a fascinating platform for a new generation of inte- grated optical devices and components can be pro- vided. Many studies on PhCs however, focused on new means of tailoring the emission and propagation of light using the photonic band gap (PBG) property whereby the photon density of states is zero. A PhC with a full PBG re…     

苋轴器官异常结构的组织分化

异常加厚是苋轴器官显著的解剖学特征.根的中央维管柱外侧产生4～5轮异常形成层,以双向活动方式形成多轮同心环状排列的异常维管束和其间的结合组织.苗端原形成层束分化为中央维管束,但无束间形成层.茎中异常形成层起源于原形成层外侧的细胞,由此产生多轮散生的异常维管束.     

大气中微子υ_μ振荡几率估算

据高能中微子的“长基线”实验计设参数 ,用数值实验常数相关联的唯象方法算出中微子质量数值 ,估算了中微子振荡几率 ,判断了 μ中微子υμ 与τ型中微子ντ 最可能发生振荡     

The Importance of Facilities in Science Education

Summaries

English

It is generally assumed that better facilities will affect the quality of education in schools, but evidence concerning this assumption is often not considered or even known. In this article, the author reviews some important studies examining the influence of facilities on science teaching. He concludes that, while the provision of good facilities may not change educational practices dramatically, they help to foster science teaching activities which involve students in a variety of stimulating activities. In general terms, the evidence reviewed in relation to science teaching is consistent with the notion that the students’ physical environment affects their study behaviour. It may be argued, therefore, that attention must be paid to the provision of good teaching facilities if active forms of learning are to be encouraged.     

Responses to anomalous data on controversial topics and theory change

This qualitative study was concerned with the role of anomalous data on controversial topics in the process of theory change. Its main aim was to identify the types of reasons that eighth graders gave for accepting or refusing evidence conflicting with their held theory and to see whether those types of reasons fitted into the taxonomy of responses proposed by Chinn and Brewer (Journal of Research in Science Teaching 35 (1998) 623–654). Two controversial topics were chosen: the extinction of the dinosaurs and the construction of the great pyramids in Giza, Egypt. The results showed that the 24 categories of reasons given by the participants, who were much younger than those involved in the study by Chinn and Brewer, fitted into their revised taxonomy, which consists of eight responses, with the exception of the response “ignoring”. Educational implications are drawn.