scholarly journals Jogo Ping Pong Aritmético como apoio no processo ensino-aprendizagem das operações básicas: um relato de experiência

2021 ◽  
Vol 6 (2) ◽  
pp. 171-188
Author(s):  
Rahilson Dias Costa ◽  
Francisco Feitosa
Keyword(s):  
Ping Pong

O presente trabalho trata do desenvolvimento e estudo de um jogo digital educativo intitulado “Ping Pong Aritmético”, aplicado para auxiliar nos estudos das operações aritméticas nos primeiros anos do Ensino Fundamental anos finais. A pesquisa realizada é caracterizada como um método de abordagem exploratória descritiva. O recurso pedagógico foi utilizado por 230 alunos de três escolas da rede pública de Manaus - AM. A coleta de dados foi feita a partir da realização de observações, questionários e entrevistas e contou com a colaboração de 23 acadêmicos do PIBID Matemática da Universidade Federal do Amazonas - UFAM. O jogo foi inicialmente pensado para ser jogado de forma presencial, devido a pandemia, as regras foram adaptadas para que pudesse ser realizado por meio remoto. A aplicação do jogo evidenciou de inicio a dificuldade dos estudantes com as operações básicas e posteriormente uma melhora em relação a essas operações. O jogo teve uma avaliação positiva dos acadêmicos que se mostraram dispostos em fazer uso desse recurso em suas aulas. Por fim, a dinâmica em grupo permitiu, mesmo nesses tempos difíceis de pandemia, proporcionar uma espécie de “socialização a distância”, quebrando a monotonia das aulas online.

scholarly journals Design of a structure model set for inorganic compounds based on ping-pong balls linked with snap buttons

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ryo Horikoshi ◽  
Hiroyuki Higashino ◽  
Yoji Kobayashi ◽  
Hiroshi Kageyama
Keyword(s):  
High School Students ◽  
Coordination Compounds ◽  
Periodic Structures ◽  
Inorganic Compounds ◽  
Structure Model ◽  
School Students ◽  
Model Sets ◽  
Ping Pong ◽  
Hands On ◽  
Model Set

Abstract Structure model sets for inorganic compounds are generally expensive; their distribution to all students in a class is therefore usually impractical. We have therefore developed a structure model set to illustrate inorganic compounds. The set is constructed with inexpensive materials: ping-pong balls, and snap buttons. The structure model set can be used to illustrate isomerism in coordination compounds and periodic structures of ceramic perovskites. A hands-on activity using the structure model set was developed for high school students and was well-received by them. Despite the concepts being slightly advanced for them, the students’ retention of the knowledge gained through the activity was tested a week after they completed the activity and was found to be relatively high, demonstrating the usefulness of the activity based on the structure model set.

scholarly journals Lipozyme 435-Mediated Synthesis of Xylose Oleate in Methyl Ethyl Ketone

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3317
Author(s):  
Maria Carolina Pereira Gonçalves ◽  
Jéssica Cristina Amaral ◽  
Roberto Fernandez-Lafuente ◽  
Ruy de Sousa Junior ◽  
Paulo Waldir Tardioli
Keyword(s):  
Oleic Acid ◽  
Methyl Ethyl Ketone ◽  
Molar Ratio ◽  
Methyl Ethyl ◽  
Sugar Ester ◽  
Molar Ratios ◽  
Emulsion Capacity ◽  
Ping Pong ◽  
Commercial Sugar ◽  
Repeated Use

In this paper, we have performed the Lipozyme 435-catalyzed synthesis of xylose oleate in methyl ethyl ketone (MEK) from xylose and oleic acid. The effects of substrates’ molar ratios, reaction temperature, reaction time on esterification rates, and Lipozyme 435 reuse were studied. Results showed that an excess of oleic acid (xylose: oleic acid molar ratio of 1:5) significantly favored the reaction, yielding 98% of xylose conversion and 31% oleic acid conversion after 24 h-reaction (mainly to xylose mono- and dioleate, as confirmed by mass spectrometry). The highest Lipozyme 435 activities occurred between 55 and 70 °C. The predicted Ping Pong Bi Bi kinetic model fitted very well to the experimental data and there was no evidence of inhibitions in the range assessed. The reaction product was purified and presented an emulsion capacity close to that of a commercial sugar ester detergent. Finally, the repeated use of Lipozyme 435 showed a reduction in the reaction yields (by 48 and 19% in the xylose and oleic acid conversions, respectively), after ten 12 h-cycles.

Structure and activity of phosphoglycerate mutase

1981 ◽  
Vol 293 (1063) ◽  
pp. 121-130 ◽  
Keyword(s):  
Active Site ◽  
Transfer Reaction ◽  
Chemical Kinetic ◽  
Phosphoglycerate Mutase ◽  
Phosphoryl Transfer ◽  
X Ray ◽  
Histidine Residues ◽  
Ping Pong ◽  
Available Information ◽  
Structure And Activity

The structure of yeast phosphoglycerate mutase determined by X-ray crystallographic and amino acid sequence studies has been interpreted in terms of the chemical, kinetic and mechanistic observations made on this enzyme. There are two histidine residues at the active site, with imidazole groups almost parallel to each other and approximately 0.4 nm apart, positioned close to the 2 and 3 positions of the substrate. The simplest interpretation of the available information suggests that a ping-pong type mechanism operates in which at least one of these histidine residues participates in the phosphoryl transfer reaction. The flexible C-terminal region also plays an important role in the enzymic reaction.

scholarly journals All1371 is a polyphosphate-dependent glucokinase in Anabaena sp. PCC 7120

Microbiology ◽  
2014 ◽  
Vol 160 (12) ◽  
pp. 2807-2819 ◽  
Author(s):  
Friederike Klemke ◽  
Gabriele Beyer ◽  
Linda Sawade ◽  
Ali Saitov ◽  
Thomas Korte ◽  
...  
Keyword(s):  
Divalent Cations ◽  
Enzymic Activity ◽  
Phosphoryl Group ◽  
Nitrogen Deprivation ◽  
Ping Pong ◽  
Nucleoside Triphosphates ◽  
Anabaena Sp ◽  
Pcc 7120 ◽  
Promoter Studies

The polyphosphate glucokinases can phosphorylate glucose to glucose 6-phosphate using polyphosphate as the substrate. ORF all1371 encodes a putative polyphosphate glucokinase in the filamentous heterocyst-forming cyanobacterium Anabaena sp. PCC 7120. Here, ORF all1371 was heterologously expressed in Escherichia coli, and its purified product was characterized. Enzyme activity assays revealed that All1371 is an active polyphosphate glucokinase that can phosphorylate both glucose and mannose in the presence of divalent cations in vitro. Unlike many other polyphosphate glucokinases, for which nucleoside triphosphates (e.g. ATP or GTP) act as phosphoryl group donors, All1371 required polyphosphate to confer its enzymic activity. The enzymic reaction catalysed by All1371 followed classical Michaelis–Menten kinetics, with k cat = 48.2 s−1 at pH 7.5 and 28 °C and K M = 1.76 µM and 0.118 mM for polyphosphate and glucose, respectively. Its reaction mechanism was identified as a particular multi-substrate mechanism called the ‘bi-bi ping-pong mechanism’. Bioinformatic analyses revealed numerous polyphosphate-dependent glucokinases in heterocyst-forming cyanobacteria. Viability of an Anabaena sp. PCC 7120 mutant strain lacking all1371 was impaired under nitrogen-fixing conditions. GFP promoter studies indicate expression of all1371 under combined nitrogen deprivation. All1371 might play a substantial role in Anabaena sp. PCC 7120 under these conditions.

scholarly journals Heterotypic piRNA Ping-Pong Requires Qin, a Protein with Both E3 Ligase and Tudor Domains

2011 ◽  
Vol 44 (6) ◽  
pp. 1005
Author(s):  
Zhao Zhang ◽  
Jia Xu ◽  
Birgit S. Koppetsch ◽  
Jie Wang ◽  
Cindy Tipping ◽  
...  
Keyword(s):  
E3 Ligase ◽  
Ping Pong

A rail-to-rail ping-pong op-amp

1996 ◽  
Vol 31 (9) ◽  
pp. 1320-1324 ◽  
Author(s):  
I.E. Opris ◽  
G.T.A. Kovacs
Keyword(s):  
Op Amp ◽  
Rail To Rail ◽  
Ping Pong
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