排序方式: 共有2条查询结果,搜索用时 0 毫秒
1
1.
Jerome Kluza Victoriane Peugnet Blanche Daunou William Laine Gwenola Kervoaze Gaëlle Rmy Anne Loyens Patrice Maboudou Quentin Fovez Corinne Grangette Isabelle Wolowczuk Philippe Gosset Guillaume Garon Philippe Marchetti Florence Pinet Muriel Pichavant Emilie Dubois-Deruy 《International journal of molecular sciences》2022,23(1)
Mitochondrial dysfunctions are implicated in several pathologies, such as metabolic, cardiovascular, respiratory, and neurological diseases, as well as in cancer and aging. These metabolic alterations are usually assessed in human or murine samples by mitochondrial respiratory chain enzymatic assays, by measuring the oxygen consumption of intact mitochondria isolated from tissues, or from cells obtained after physical or enzymatic disruption of the tissues. However, these methodologies do not maintain tissue multicellular organization and cell-cell interactions, known to influence mitochondrial metabolism. Here, we develop an optimal model to measure mitochondrial oxygen consumption in heart and lung tissue samples using the XF24 Extracellular Flux Analyzer (Seahorse) and discuss the advantages and limitations of this technological approach. Our results demonstrate that tissue organization, as well as mitochondrial ultrastructure and respiratory function, are preserved in heart and lung tissues freshly processed or after overnight conservation at 4 °C. Using this method, we confirmed the repeatedly reported obesity-associated mitochondrial dysfunction in the heart and extended it to the lungs. We set up and validated a new strategy to optimally assess mitochondrial function in murine tissues. As such, this method is of great potential interest for monitoring mitochondrial function in cohort samples. 相似文献
2.
M. N. Charasse B. Bartenlian J. P. Hirtz A. Peugnet J. Chazelas G. Amendola 《Journal of Electronic Materials》1990,19(6):567-573
The growth of GaAs on patterned Si substrates is essential for the integration of GaAs and Si devices. Moreover this growth
may have to be done in wells to planarize the surfaces of the Si and GaAs devices for their interconnection. In this study,
GaAs is grown by MBE on such patterned Si substrates, with window width down to 3 μm, and a complete structural characterization
of the material is made by electron microscopy. In every case, SEM observations show a very good definition of the pattern
by the contrast of the flat surface of the monocrystalline GaAs compared to the very rough surface of the polycrystalline
GaAs. Cross-sectional observations by STEM or TEM on non-etched samples reveal that the quality of the monocrystalline GaAs
is at least as good in terms of defect density as that of the standard GaAs on Si. On samples etched with a plasma to produce
wells, grains often form against the Si sidewall. Chemical etching with lateral etching avoids contact of the growing GaAs
with the Si sidewall and subsequent grain formation. The crystalline quality obtained on etched samples is not as good as
on non etched samples. A way of preparing the wells to improve this crystalline quality is proposed. 相似文献
1