Abraham Lincoln & His Family

Photo reproduction five members of the Lincoln Family gathered around a table.https://scholarsjunction.msstate.edu/fvw-artifacts/4484/thumbnail.jp

Phosphotyrosine Signaling Analysis in Human Tumors Is Confounded by Systemic Ischemia-Driven Artifacts and Intra-Specimen Heterogeneity

Tumor protein phosphorylation analysis may provide insight into intracellular signaling networks underlying tumor behavior, revealing diagnostic, prognostic or therapeutic information. Human tumors collected by The Cancer Genome Atlas program potentially offer the opportunity to characterize activated networks driving tumor progression, in parallel with the genetic and transcriptional landscape already documented for these tumors. However, a critical question is whether cellular signaling networks can be reliably analyzed in surgical specimens, where freezing delays and spatial sampling disparities may potentially obscure physiologic signaling. To quantify the extent of these effects, we analyzed the stability of phosphotyrosine (pTyr) sites in ovarian and colon tumors collected under conditions of controlled ischemia and in the context of defined intratumoral sampling. Cold-ischemia produced a rapid, unpredictable, and widespread impact on tumor pTyr networks within 5 minutes of resection, altering up to 50% of pTyr sites by more than 2-fold. Effects on adhesion and migration, inflammatory response, proliferation, and stress response pathways were recapitulated in both ovarian and colon tumors. In addition, sampling of spatially distinct colon tumor biopsies revealed pTyr differences as dramatic as those associated with ischemic times, despite uniform protein expression profiles. Moreover, intratumoral spatial heterogeneity and pTyr dynamic response to ischemia varied dramatically between tumors collected from different patients. Overall, these findings reveal unforeseen phosphorylation complexity, thereby increasing the difficulty of extracting physiologically relevant pTyr signaling networks from archived tissue specimens. In light of this data, prospective tumor pTyr analysis will require appropriate sampling and collection protocols to preserve in vivo signaling features.National Institutes of Health (U.S.) (Grant U24 CA159988

Laparoscopic Video Analysis for Training and Image Guided Surgery

Automatic analysis of Minimally Invasive Surgical video has the potential to drive new solutions for alleviating needs of safe and reproducible training programs, objective and transparent evaluation systems and navigation tools to assist surgeons and improve patient safety. Surgical video is an always available source of information, which can be used without any additional intrusive hardware in the operating room. This paper is focused on surgical video analysis methods and techniques. It describes authors' contributions in two key aspects, the 3D reconstruction of the surgical field and the segmentation and tracking of tools and organs based on laparoscopic video images. Results are given to illustrate the potential of this field of research, like the calculi of the 3D position and orientation of a tool from its 2D image, or the translation of a preoperative resection plan into a hepatectomy surgical procedure using the shading information of the image. Research efforts are required to further develop these technologies in order to harness all the valuable information available in any video-based surgery

Pengantar psikologi abnormal

viii.185 hlm. : - ; 25 cm

Abraham Lincoln & His Family

Photo reproduction five members of the Lincoln Family gathered around a table.https://scholarsjunction.msstate.edu/fvw-prints/1822/thumbnail.jp

Electrical, thermal, and tensile properties of cycloaliphatic epoxy/carbon black and cycloaliphatic epoxy/fumed silica nanocomposites

© 2018, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved. Carbon black and fumed silica have previously been shown to reinforce polymer nanocomposites. Their effects on electrical and thermal properties are also of interest for potential use in high voltage and temperature applications. Cycloaliphatic epoxy is examined in this study because of its resistance to aging. The objective of this study was to determine the effects of adding 0.5 to 2 wt% carbon black or 1 to 4 wt% fumed silica to cycloaliphatic epoxy. Electrical conductivity, thermal conductivity, tensile properties, and glass transition temperature as determined by dynamic mechanical analysis were tested. The results of these tests showed that up to 2 wt% carbon black or 4 wt% fumed silica had little effect on the electrical, thermal, or tensile properties of cycloaliphatic epoxy