基于科学文化的问题化教学在初中科学教学中的运用

科学文化的问题化教学是引导学生发现问题、解决问题的过程,对于学生掌握知识有着重要的作用。目前,素质教育的实施更为侧重科学文化的渗透,以期全面培育初中生的学科核心素养。所以,在初中阶段的科学课程教学中,可以运用问题化教学法,通过合理的问题引导以调动学生的思维,锻炼学生的知识运用能力,提升学生的科学文化修养。对此,探究问题化教学法在初中科学教学中的运用策略,以求寻找提升科学教学效率的有效途径,推进初中科学教学工作优化改进。

核心素养下初中科学借力传统文化开展深度学习策略探究

中华民族文化源远流长、博大精深,让每一位中国人及海外华人都引以为傲,是中华民族精神的强大凝聚力。而科学则是初中教育的关键组成部分,如果能巧妙地将传统文化和初中科学教学相整合,其意义非凡。在应试教育理念的深度影响下,学生群体往往只能被动地接受来自教师的教学讲解,因此导致初中科学教学出现形式化的问题,所以教师有必要积极地优化和改进教育方法,同时引导学生更好地完成对相应科学知识的探究和认识,完成对科学实验的操作,融入深度学习当中,提高学生的科学素养。初中生具备强烈的好奇心和求知欲,因此在科学教学中教师可以有效地完成知识预热,组织学生有针对性地进行实验探究,鼓励学生进行创新发现,此举意义非凡。基于此,重点分析核心素养视域下的初中科学深度学习策略,以求能够为相关单位提供借鉴作用。

Synthesis,crystal structures of novel complexes of rare earth with norfloxacin,interaction with DNA and BSA

Three novel rare earth complexes [N（CH 3） 4 ][Ln（NF） 4 ]·6H 2 O（Ln=Nd（III）（1）,Sm（III）（2）,Ho（III）（3）） were synthesized using hydrothermal method from norfloxacin HNF=1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7-（1-piperazinyl）-3-quinoline carboxylic acid,C 16 H 18 FN 3 O 3）,imidazole and rare earth nitrates.The complexes were characterized by elemental analysis,FT-IR,TG-DTG and X-ray single crystal diffraction.Each rare earth ion was eight-coordinated with carboxyl-O atoms and keto-O atoms from norfloxacin.Four of the norfloxacin ions acted as bidentate chelate group took part in the coordination with rare earth ion.The structures of complexes were tetragonal system with space group I4 1 /acd,which were allomerism.The interaction between complex 1 and DNA was studied by electronic absorption spectra and fluorescence spectroscopy.The binding interaction between the complex 1 and bovine serum albumin（BSA） was studied by fluorescence spectroscopy.The complex 1 bound to DNA by the mode of partial intercalation.Complex 1 had a strong ability to quench the fluorescence from BSA.The complex interaction was mainly a static quenching process with BSA together with formation of two binding sites.