Hasil Pencarian  ::  Simpan CSV :: Kembali

"Based on the 38th annual conference of the International Society on Oxygen Transport to Tissue (ISOTT), held in Ascona, Switzerland in July 2010, this volume covers all aspects of oxygen transport from air to the cells, organs and organisms, instrumentation and methods to sense oxygen and clinical evidence."

"CONTENTS : - NCF/NEC CONFERENCE MANAGEMENT - NEW TECHNOLOGY SEMINARS - 1. Impact of Digital Switching and Transmission on the Loop Plant - 2. Designing Reliable Software - 3. Recent Developments in Microcomputer Architecture - 4. Extreme Value Engineering in Telecommunications - 5. Managing the Software Team - 6. Fiber Optics - Recent Advances - 7. Digital Automatic Private Branch Exchange Systems - 8. Methods of Testing Software Systems - 9. Successful Application of Minicomputers in Real-Time Systems - 10. Human Factors Considerations in the Design of Telecommunications/Computer Systems - 11. Modern Applications of Telecommunications Switching Systems - 12. Impact of Modern Telephone System Technology on the Exchange Plant - 13. Digital Switching: Analog Interface Design - 14. Advantages and Uses of Data Base Management Systems - 15. Computer Networking and Distributed Processing - 16. Novel Applications Using LSI Technology - 17. LSI Application in Telecommunications Systems - 18. Data Switching - TECHNICAL PAPER SESSIONS - SESSION 1: MICROPROCESSOR EDUCATION - SESSION 2: NETWORK ARCHITECTURE PLANNING MECHANIZATION - SESSION 3: FIBER OPTICS - SESSION 4: SENSOR TECHNOLOGY - SESSION 5: MAGNETIC DISK TECHNOLOGY - SESSION 6: ENERGY RESEARCH - SESSION 7: FUTURE DIRECTIONS FOR DIGITAL TELECOMMUNICATIONS - SESSION 8: MICRO-ELECTRONICS IN MEDICAL DIAGNOSIS AND THERAPY - SESSION 9: PERSONAL COMPUTERS AND PERSONAL TERMINALS - SESSION 10: CONCEPTS IN COMMUNICATION PROTECTION - SESSION 11: VIDEO TEXT - SESSION 12: ECONOMIC ANALYSIS OF INVESTMENT ALTERNATIVES - SESSION 13: MICROPROCESSOR APPLICATIONS AND CONSUMER PRODUCTS - SESSION 14: ELECTRONICS SYSTEMS FOR COST EFFECTIVE ENERGY MANAGEMENT - SESSION 15: NEW TELECOMMUNICATIONS SERVICES - SESSION 16: RELIABLE COMPUTING SYSTEMS USING DISTRIBUTED PROCESSING TECHNIQUES - SESSION 17: NEW TRENDS IN MOBILE TELEPHONY - SESSION 18: EXPANDING IMPACT OF EMI/EMC - SESSION 19: SOFTWARE RELIABILITY - SESSION 20: AUTOMOTIVE ELECTRONICS - SESSION 21: MULTIPLE-SERVICE SUBSCRIBER LOOPS - SESSION 22: COMPUTER AIDED DESIGN: INNOVATION SOLUTIONS TO DESIGN AUTOMATION PROBLEMS - LIST OF CONTRIBUTORS"

"Fe3O4 merupakan material ferrimagnetik paruh logam dengan TC 860 K yang menunjukkan transisi logam-isolator MIT pada 120 K. Dalam bentuk bulk, magnetisasi saturasi material tersebut adalah 0.6 Tesla 471 emu/cm3 . Penelitian eksperimental terbaru telah menunjukkan bahwa magnetisasi saturasi dari lapisan tipis nano-Fe3O4 dapat mencapai 760 emu/cm3 yang diakibatkan oleh pembalikan spin ion Fe pada situs tetrahedral yang dibantu oleh vakansi oksigen VO . Sistem tersebut telah menunjukkan suhu MIT yang lebih tinggi 150 K . Pembalikan spin merupakan fenomena baru pada Fe3O4, sedangkan MIT merupakan fenomena yang sudah ada sejak lama. Kami menggagas sebuah model dan perhitungan untuk menginvestigasi mekanisme dari kedua fenomena tersebut. Hasil perhitungan kami menunjukkan bahwa konfigurasi ferrimagnetik untuk sistem tanpa VO secara energetik lebih disukai. Namun, dengan keberadaan VO, konfigurasi keadaan dasar dari sistem berubah menjadi ferromagnetik. Terkait MIT, dengan menggagas ketergantungan beberapa hopping integral terhadap suhu dalam model, kami mendemonstrasikan bahwa sistem tanpa dan dengan VO mengalami MIT dengan cara yang berbeda, menyebabkan sistem dengan VO memiliki suhu MIT yang lebih tinggi sesuai dengan data eksperimen. Hasil perhitungan kami juga menunjukkan bahwa MIT pada kedua sistem terjadi bersamaan dengan redistribusi elektron pada tiga ion Fe di setiap satuan formula Fe3O4. Dengan menganggap bahwa ketergantungan hopping integral terhadap suhu diduga timbul akibat efek Jahn-Teller dinamis, teori fenomenologis kami mampu menjembatani teori yang telah ada terkait MIT akibat transisi struktur dan keteraturan muatan.

---

Fe3O4 is a half metallic ferrimagnet with TC 860 K exhibiting metal insulator transition MIT at 120 K. In bulk form, the saturation magnetization is 0.6 Tesla 471 emu cm3 . A recent experimental study has shown that the saturation magnetization of nano Fe3O4 thin films can achieve up to 760 emu cm3, attributed to spin flipping of Fe ions at tetrahedral sites assisted by oxygen vacancies VO . Such a system has shown to have higher MIT temperature 150 K . The spin flipping is a new phenomenon in Fe3O4, while the MIT is a long standing one. Here, we propose a model and calculations to investigate the mechanisms of both phenomena. Our results show that, for the system without VO, the ferrimagnetic configuration is energetically favorable. Remarkably, upon inclusion of VO, the ground state configuration switches into ferromagnetic. As for the MIT, by proposing temperature dependences of some hopping integrals in the model, we demonstrate that the system without and with VO undergo the MIT in slightly different ways, leading to higher MIT temperature for system withVO, in agreement with the experimental data. Our results also show that the MIT in both systems occur concomitantly with the redistribution of electrons among the three Fe ions in each Fe3O4 formula unit. As such temperature dependences of hopping integrals may arise due to dynamic Jahn Teller effects, our phenomenological theory may provide a way to reconcile existing theories relating the MIT to the structural transition and the charge ordering."

"Latar belakang: Penyakit jantung koroner merupakan salah satu penyebab utama kematian di negara berkembang, termasuk Indonesia. Penyakit ini merupakan salah satu penyebab gagal jantung. Terapi yang selama ini dilakukan belum sepenuhnya mampu memperbaiki kerusakan otot jantung yang telah terjadi. Terapi sel punca baik injeksi maupun patch juga masih belum memperlihatkan hasil yang memuaskan. Penggunaan patch jantung dihadapkan pada masalah seperti rendahnya viabilitas sel yang dihasilkan. Hipotermia pada suhu 4°C yang digunakan untuk isolasi kardiomiosit selama ini dikaitkan dengan gangguan aktivitas sel yang menyebabkan penurunan jumlah sel viabel yang dihasilkan. Suhu 37°C yang merupakan suhu fisiologis tubuh dinilai mampu menghasilkan viabilitas sel lebih baik. Metode: Studi ekperimental in vitro dilakukan di Pelayanan Jantung Terpadu Rumah Sakit Cipto Mangunkusumo (PJT-RSCM) dan Indonesian Medical Education and Research Institute (IMERI) Fakultas Kedokteran Universitas Indonesia dalam periode Desember 2019 hingga November 2020 dengan mengikutsertakan subjek pasien yang menjalani operasi total koreksi tetralogy of Fallot. Jaringan reseksi otot infundibulum jantung diambil kemudian dilakukan isolasi untuk menilai viabilitas sel dan ekspresi genetik. Hasil: Delapan subjek ((n = 4) ± 95% C.I) kelompok suhu 37°C secara signifikan menghasilkan jumlah sel viabel yang lebih banyak (mean: 2675sel/mg) dibandingkan suhu 4°C (mean: 970 sel/mg) dengan (p <0,05). Ekspresi gen yang mengekspresikan sel kardiomiosit secara flowsitometer terlihat kelompok medium transpor 37°C secara bermakna lebih tinggi dibandingkan dengan suhu 4°C. Simpulan: Isolasi kardiomiosit menggunakan medium transpor suhu fisiologis (37⁰C) menghasilkan jumlah sel viable yang lebih banyak dibandingkan medium konvensional (4⁰C).

---

Background: Coronary heart disease is one of the main causes of death in developing countries, including Indonesia. This disease is one of the causes of heart failure. The therapy that has been implemented has not able to repair the damage of the heart muscles that have occurred. Stem cell therapy, either injection or patch, has not succeeded satisfactorily. The use of the cardiac patch is exposed to many problems such as low viability of the cells produced. Hypothermia at 4°C, which is used for isolation of cardiomyocytes related with activity disturbance which causes a decrease in the number of viable cells produced. The temperature 37°C which is the body's physiological temperature considered can produce better cell viability.

Methods: An experimental invitro study was conducted in the Pelayanan Jantung Terpadu Cipto Mangunkusumo (PJT-RSCM) and the Indonesian Medical Education and Research Institute (IMERI) Faculty of Medicine, University of Indonesia from December 2019 to November 2020 by recruiting patient subjects who underwent total correction of tetralogy of Fallot. The resection of the cardiac infundibulum was taken and then isolated to assess cell viability and gene expression.

Results: A total of eight subjects ((n = 4) ± 95% CI) the 37°C group produced significantly more viable cells (mean: 2675 cells/mg) than at 4°C (mean: 970 cells/mg).)) with (p <0.05). The expression of genes expressing cardiomyocytes by flowcitometer showed that the physiological group (37°C) was significantly higher than the conventional group (4°C).

Conclusion: Isolation of cardiomyocytes using a physiological temperature transport medium (37⁰C) resulted in a higher number of cells than conventional medium (4⁰C)."