PENGARUH EFEKTIFITAS PENGGUNAAN MEDIA PEMBELAJARAN TERHADAP PENINGKATAN HASIL BELAJAR GEOGRAFI SISWA KELAS XI IIS SMAN 2 SERUWAY KABUPATEN ACEH TAMIANG TAHUN PEMBELAJARAN 2018/2019

Pengaruh Efektivitas Penggunaan Media Pembelajaran Terhadap Hasil Belajar Geogrrafi Siswa Kelas XI IIS SMA Negeri 2 Seruway Tahun Ajaran 2018/2019. Skripsi, Jurusan Pendidikan Geografi Fakultas Ilmu Sosial Universitas Negeri Medan. 2019. Penelitian ini bertujuan untuk mengetahui pengaruh efektivitas penggunaan media pembelajaran terhadap peningkatan hasil belajar geografi dan untuk mengetahui perbedaan hasil belajar siswa yang menggunakan media pembelajaran dengan hasil belajar siswa tanpa menggunakan media pembelajaran pada siswa kelas XI IIS SMAN 2 Seruway Kabupaten Aceh Tamiang. Penelitian dilaksanakan dengan cara observasi dan wawancara, bersifat deskriptif korelasional dengan pendekatan kuantitatif, teknik pengumpulan data dilakukan dengan angket dan kuisioner. Data dianalisis secara deskriptif kualitatif dan kuantitatif. Hasil penelitian menunjukkan bahwa nilai rerata siswa yang tidak menggunakan media pembelajaran sebesar 60,32 dan nilai rerata siswa yang menggunakan media pembelajaran sebesar 78,04 dengan nilai kepercayaan sebesar 74%. Sedangkan nilai sebaran keefektifan media pembelajaran rata-rata sebesar 40,02 termasuk ke dalam kategori efektif tinggi yang berdampak pada peningkatan hasil belajar siswa

Isolation of Arabidopsis extracellular ATP‐binding proteins by affinity proteomics and identification of PHOSPHOLIPASE C‐LIKE 1 as an extracellular protein essential for fumonisin B1 toxicity

ATP is secreted to the extracellular matrix where it activates plasma membrane receptors for controlling plant growth and stress‐adaptive processes. DOES NOT RESPOND TO NUCLEOTIDES 1 (DORN1), the first plant ATP receptor was identified, but key downstream proteins are sought after. Here, we identified 120 proteins secreted by Arabidopsis cell cultures and screened them for putative stress‐responsive proteins using ATP‐affinity purification. We report three Arabidopsis proteins isolated by ATP‐affinity: PEROXIDASE 52, SUBTILASE‐LIKE SERINE PROTEASE 1.7, and PHOSPHOLIPASE C‐LIKE 1. In wildtype Arabidopsis, expression of genes encoding all three proteins responded to fumonisin B1, a cell death‐activating mycotoxin. Expression of PEROXIDASE 52 and PHOSPHOLIPASE C‐LIKE 1 genes was altered in fumonisin B1‐resistant salicylic acid induction‐deficient (sid2) mutants. Exposure to fumonisin B1 suppressed PHOSPHOLIPASE C‐LIKE 1 expression in sid2 mutants, suggesting that inactivation of this gene might provide mycotoxin tolerance. Accordingly, gene knockout mutants of PHOSPHOLIPASE C‐LIKE 1 were resistant to fumonisin B1‐induced death. Activation of PHOSPHOLIPASE C‐LIKE 1 gene expression by exogenous ATP was not blocked in dorn1 loss‐of‐function mutants, indicating that DORN1 is not required. Furthermore, exogenous ATP rescued both wildtype and dorn1 mutants from fumonisin B1 toxicity, suggesting that different ATP receptor(s) are operational in this process. Our results point to the existence of additional plant ATP receptor(s) and provide crucial downstream targets for use in designing screens to identify these receptors. Finally, PHOSPHOLIPASE C‐LIKE 1 serves as a convergence point for fumonisin B1 and extracellular ATP signalling, and functions in Arabidopsis stress response to fumonisin B1

33000 Photons per MeV from Mixed (Lu0.75Y0.25)3Al5O12:Pr Scintillator Crystals

(LuxY1-x)3Al5O12:Pr (x = 0.25, 0.50, 0.75) crystals have been grown by the Czochralski method and their scintillation properties have been examined. Compared to the well-respected LuAG:Pr scintillator, which has so extensively been studied in the recent years, the new mixed LuYAG:Pr crystals display markedly higher light yields, regardless of the value of x. In particular, (Lu0.75Y0.25)3Al5O12:0.2%Pr characterized by a yield of 33000 ph/MeV, an energy resolution of 4.4% (at 662 keV), and a density of 6.2 g/cm3, seems to be an ideal candidate to supercede Lu3Al5O12:0.2%Pr (19000 ph/MeV, 4.6%, 6.7 g/cm3) in various applications. The observed enhancement of light output following the partial substitution of lutetium by yttrium is most probably related to some specific differences in distributions of shallow traps in particular materials

Cyclin-dependent kinase activity enhances phosphatidylcholine biosynthesis in Arabidopsis by repressing phosphatidic acid phosphohydrolase activity

Coordination of endomembrane biogenesis with cell cycle progression is considered to be important in maintaining cell function during growth and development. We previously showed that disruption of PHOSPHATIDIC ACID PHOSPHOHYDROLASE (PAH) activity in Arabidopsis thaliana stimulates biosynthesis of the major phospholipid phosphatidylcholine (PC) and causes expansion of the endoplasmic reticulum. Here we show that PC biosynthesis is repressed by disruption of the core cell cycle regulator CYCLIN-DEPENDENT KINASE A;1 (CDKA;1) and that this repression is reliant on PAH. Furthermore, we show that CDKs phosphorylate PAH1 at serine 162, which reduces both its activity and membrane association. Expression of a CDK-insensitive version of PAH1 with a serine 162 to alanine substitution represses PC biosynthesis and also reduces the rate of cell division in early leaf development. Together our findings reveal a physiologically important mechanism that couples the rate of phospholipid biosynthesis and endomembrane biogenesis to cell cycle progression in Arabidopsis

Spectroscopy and Thermoluminescence of LuAlO3:Ce

The present status of the LuAlO3:Ce scintillator is reviewed. Scintillation mechanism of this material is based on capture by Ce3+ of holes and then electrons from their respective bands. Results of spectroscopic and thermoluminescence experiments are presented to support this model

Micropatterned 2D Hybrid Perovskite Thin Films with Enhanced Photoluminescence Lifetimes

The application of luminescent materials in display screens and devices requires micropatterned structures. In this work, we have successfully printed microstructures of a two-dimensional (2D), orange-colored organic/inorganic hybrid perovskite ((C6H5CH2NH3)2PbI4) using two different soft lithography techniques. Notably, both techniques yield microstructures with very high aspect ratios in the range of 1.5-1.8. X-ray diffraction reveals a strong preferential orientation of the crystallites along the c-axis in both patterned structures, when compared to nonpatterned, drop-casted thin films. Furthermore, (time-resolved) photoluminescence (PL) measurements reveal that the optical properties of (C6H5CH2NH3)2PbI4 are conserved upon patterning. We find that the larger grain sizes of the patterned films with respect to the nonpatterned film give rise to an enhanced PL lifetime. Thus, our results demonstrate easy and cost-effective ways to manufacture patterns of 2D organic/inorganic hybrid perovskites, while even improving their optical properties. This demonstrates the potential use of color-tunable 2D hybrids in optoelectronic devices

Metabolic changes related to the IDH1 mutation in gliomas preserve TCA-cycle activity: An investigation at the protein level

The discovery of the IDH1 R132H (IDH1 mut) mutation in low-grade glioma and the associated change in function of the IDH1 enzyme has increased the interest in glioma metabolism. In an earlier study, we found that changes in expression of genes involved in the aerobic glycolysis and the TCA cycle are associated with IDH1 mut. Here, we apply proteomics to FFPE samples of diffuse gliomas with or without IDH1 mutations, to map changes in protein levels associated with this mutation. We observed significant changes in the enz

Migration behaviour of Europium implanted into single crystalline 6H-SiC

Migration behaviour of Europium (Eu) implanted into 6H-SiC was investigated using Rutherford backscattering spectroscopy (RBS), RBS in a channelling mode (RBS-C) and scanning electron microscopy (SEM). Eu ions of 360 keV were implanted into 6H-SiC at 600 °C to a fluence of 1 × 1016 cm−2. The implanted samples were sequentially annealed at temperatures ranging from 1000 to 1400 °C, in steps of 100 °C for 5 h. RBS-C showed that implantation of Eu into 6H-SiC at 600 °C retained crystallinity with some radiation damage. Annealing of radiation damage retained after implantation already took place after annealing at 1000 °C. This annealing of radiation damage progressed with increasing annealing temperature up to 1400 °C. A shift of Eu towards the surface took place after annealing at 1000 °C. This shift became more pronounced and was accompanied by loss of Eu from the surface at annealing temperatures >1000 °C. This shift was accompanied by broadening of Eu peak/Fickian diffusion after annealing at temperatures >1100 °C. The migration of Eu occurring concurrently with the annealing of radiation damage was explained by trapping and de-trapping of Eu by radiation damage.The National Research Foundation (NRF) (grant no: 94104) of South Africahttp://www.journals.elsevier.com/vacuum2018-07-30hj2017Physic