Model Pembelajaran Problem Solving Dan Korelasinya Terhadap Kemampuan Berpikir Kritis Siswa

Tujuan penelitian: Penelitian ini bertujuan untuk mendapatkan hasil analisis keterlaksanaan model pembelajaran Problem Solving dan Korelasinya terhadap kemampuan berpikir kritis siswa yang dan untuk melihat hubungan keterlaksanaan model tersebut terhadap kemampuan berpikir kritis siswa kelas XI  SMKN 3 Kota Jambi pada materi termokimia. Metodologi: Penelitian ini termasuk jenis penelitian kuantitatif jenis korelasional. Sampel ditentukan dengan teknik simple random sampling dengan cara undian. Instrumen penelitian berupa lembar observasi yang terdiri dari lembar observasi keterlaksanaan model Problem Solving dan kemampuan berpikir kritis siswa dan postest hasil belajar siswa. Data dianalisis untuk melihat korelasi keterlaksanaan model Problem Solving terhadap kemampuan berpikir kritis siswa dilakukan dengan uji korelasi Product Moment dan uji signifikansi dengan uji t. Temuan utama: Keterlaksanaan model Problem Solving dikategorikan baik, ditinjau dari rata-rata aktivitas keterlaksanaan dari guru dan siswa tiap pertemuan. Hasil uji korelasi antara keterlaksanaan model Problem Solving oleh siswa dengan kemampuan berpikir kritis siswa diperoleh r=0,769. Hasil uji signifikansi diperoleh thitung=5,64 dan ttabel=1,69 dengan dk=32 dan α=0,05. Dari uji hipotesis menunjukkan thitung>ttabel. Hasil Penelitian membuktikan bahwa terdapat korelasi keterlaksanaan model Problem Solving terhadap kemampuan berpikir kritis siswa. Keterbaruan dari penelitian ini adalah merepresentasikan hubungan dari dua variabel, yaitu penggunaan model problem solving dengan kemampuan berpikir kritis siswa. Keterbaruan penelitian: Penelitian ini menunjukkan bahwa model pembelajaran problem solving memiliki hubungan yang signifikan dengan keterampilan berpikir kritis. Oleh karena itu dianjurkan agar menggunakan model tersebut kedalam pembelajaran

Structural journey of an insecticidal protein against western corn rootworm

The broad adoption of transgenic crops has revolutionized agriculture. However, resistance to insecticidal proteins by agricultural pests poses a continuous challenge to maintaining crop productivity and new proteins are urgently needed to replace those utilized for existing transgenic traits. We identified an insecticidal membrane attack complex/perforin (MACPF) protein, Mpf2Ba1, with strong activity against the devastating coleopteran pest western corn rootworm (WCR) and a novel site of action. Using an integrative structural biology approach, we determined monomeric, pre-pore and pore structures, revealing changes between structural states at high resolution. We discovered an assembly inhibition mechanism, a molecular switch that activates pre-pore oligomerization upon gut fluid incubation and solved the highest resolution MACPF pore structure to-date. Our findings demonstrate not only the utility of Mpf2Ba1 in the development of biotechnology solutions for protecting maize from WCR to promote food security, but also uncover previously unknown mechanistic principles of bacterial MACPF assembly

“Don’t tell me this isn’t relevant all over again in its brand new same old way”: imagination, agitation, and raging against the machine in Ali Smith’s Spring

This paper explores the third novel in Ali Smith’s seasonal quartet, Spring. Using Achille Mbembe’s Necropolitics as a conceptual frame, I analyze Smith’s rendering of a Britain grappling with Brexit in times of transnational populism. As with Autumn and Winter, Smith’s prose is saturated with intertextual borrowings from pop and “high” culture, also interrogating the links between “nanoracism” and the “immunity and community” knot (Dillet). This paper reads Spring alongside Smith’s contribution to and advocacy of the Refugee Tales project regarding the diverse discourses surrounding migration, xenophobia, and indefinite detention. Smith’s writing traces the darkness of our populist present with its rhetorical and material violence, as well as the possibilities for creative response and resistance. I argue that her seasonal quartet to date and her work with Refugee Tales aesthetically and ethically defend the principle that human dignity, both individual and collective, rests on the ability to tell stories

Consenso colombiano de atención, diagnóstico y manejo de la infección por SARS-COV-2/COVID-19 en establecimientos de atención de la salud Recomendaciones basadas en consenso de expertos e informadas en la evidencia

The “Asociación Colombiana de Infectología” (ACIN) and the “Instituto de Evaluación de Nuevas Tecnologías de la Salud” (IETS) created a task force to develop recommendations for Covid 19 health care diagnosis, management and treatment informed, and based, on evidence. Theses reccomendations are addressed to the health personnel on the Colombian context of health services. © 2020 Asociacion Colombiana de Infectologia. All rights reserved

Target highlights in CASP13: experimental target structures through the eyes of their authors

The functional and biological significance of selected CASP13 targets are described by the authors of the structures. The structural biologists discuss the most interesting structural features of the target proteins and assess whether these features were correctly reproduced in the predictions submitted to the CASP13 experiment

Pathways to care for people for dementia: an international multi-centre study

Objective: the aim of the present study was to characterize the clinical pathways that people with dementia (PwD) in different countries follow to reach specialized dementia care. Methods: we recruited 548 consecutive clinical attendees with a standardized diagnosis of dementia, in 19 specialized public centers for dementia care in 15 countries. The WHO “Encounter Form”, a standardized schedule that enables data concerning basic socio-demographic, clinical and pathways data to be gathered, was completed for each participant. Results: the median time from the appearance of the first symptoms to the first contact with specialist dementia care was 56 weeks. The primary point of access to care was the general practitioners (55.8%). Psychiatrists, geriatricians and neurologists represented the most important second point of access. In about a third of cases, PwD were prescribed psychotropic drugs (mostly antidepressants and tranquillizers). Psychosocial interventions (such as psychological counselling, psychotherapy and practical advice) were delivered in less than 3% of situations. The analyses of the ‘pathways diagram’ revealed that the path of PwD to receiving care is complex, diverse across countries, and that there are important barriers to clinical care. Conclusions: the study of pathways followed by PwD to reach specialized care has implications for the subsequent course and the outcome of dementia. Insights into local differences in the clinical presentations and the implementation of currently available dementia care are essential to develop more tailored strategies for these patients, locally, nationally and internationally

Alcoholic extracts from Paulownia tomentosa leaves for silver nanoparticles synthesis

Paulownia tomentosa (P. tomentosa) is a hardwood tree that has economic and scientific relevance but has no use as food. For that reason, we selected it to conduct a study on the synthesis of silver nanoparticles (AgNPs) using hydroalcoholic extracts from its leaves. Phytochemical sources had been widely used as reducing agents for synthesis of nanoparticles. Our work is the first approach for studying the correlation between the composition of the extracts and the AgNPs synthesis features. Isopropyl alcohol, ethanol, and water were proposed as extraction solvents. Nanoparticles were characterized by UV–vis, FTIR, and Scanning Electron Microscopy/Energy Dispersive X-ray spectroscopy (SEM/EDX) and the Antimicrobial activity was evaluated. Our findings suggest that the composition of the extracts varies with the selection of the extraction solvent. This is relevant because solvents with similar characteristics and polarity (isopropyl alcohol and ethanol) produced different AgNPs features such as ζ potential that was −20.5 ± 0.41, −25 ± 0.12 and 31 ± 0.79 mV for samples extracted with isopropyl alcohol, ethanol, and water, respectively. Samples obtained with isopropyl alcohol produced nanoparticles with the highest antioxidant activity and stability. Also, we found that size, shape, reaction kinetics, and bactericidal properties have a strong correlation with the composition of the plant extract. Our results justify the use of a wide range of extraction solvents to obtain detail implications on size and shape of nanoparticles, and the use of chromatographic techniques to determine each fraction composition. Our investigation is the first step in a coherent path to propose reaction mechanisms on nanoparticles synthesis using complex mixtures from Paulownia tomentosa extracts. Keywords: Biosynthesis, Silver nanoparticles (AgNPs), Paulownia tomentosa, Electrochemical-CUPRAC, Trolox Equivalent Antioxidant Capacity, Flavonoid oxidatio