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https://www.readbyqxmd.com/read/28079969/molecular-polygons-probe-the-role-of-intramolecular-strain-in-the-photophysics-of-%C3%AF-conjugated-chromophores
#1
Philipp Wilhelm, Jan Vogelsang, Georgiy Poluektov, Nina Schönfelder, Tristan J Keller, Stefan-Sven Jester, Sigurd Höger, John M Lupton
π-Conjugated segments, chromophores, are the electronically active units of polymer materials used in organic electronics. To elucidate the effect of the bending of these linear moieties on elementary electronic properties, such as luminescence color and radiative rate, we introduce a series of molecular polygons. The π-system in these molecules becomes so distorted in bichromophores (digons) that these absorb and emit light of arbitrary polarization: any part of the chain absorbs and emits radiation with equal probability...
January 12, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28067425/conspicuousness-color-resemblance-and-toxicity-in-geographically-diverging-mimicry-the-pan-amazonian-frog-allobates-femoralis
#2
Adolfo Amézquita, Óscar Ramos, Mabel Cristina González, Camilo Rodríguez, Iliana Medina, Pedro Ivo Simões, Albertina Pimentel Lima
Predation risk is allegedly reduced in Batesian and Müllerian mimics, because their coloration resembles the conspicuous coloration of unpalatable prey. The efficacy of mimicry is thought to be affected by variation in the unpalatability of prey, the conspicuousness of the signals, and the visual system of predators that see them. Many frog species exhibit small colorful patches contrasting against an otherwise dark body. By measuring toxicity and color reflectance in a geographically variable frog species and the syntopic toxic species, we tested whether unpalatability was correlated with between-species color resemblance and whether resemblance was highest for the most conspicuous components of coloration pattern...
January 9, 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/28065876/three-dimensional-anatomy-of-the-white-matter-fibers-of-the-temporal-lobe-surgical-implications
#3
L Pescatori, M P Tropeano, A Manfreda, R Delfini, A Santoro
BACKGROUND: The aim of this work is to describe in detail the complex three-dimensional organization of the white matter of the temporal lobe and discuss the surgical implications of the approaches to lesions located into the mesial temporal region and within the temporal horn and the atrium of the lateral ventricles. METHODS: Sixteen human cerebral hemispheres fixed in a 10% formalin solution for at least 40 days were studied. After removal of the arachnoid membrane, the hemispheres were frozen at -15 C° for at least 15 days , and the Klingler' technique which consist in the microscopic dissection and progressive identification of white matter fibers was performed...
January 5, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28064218/effectiveness-of-analogs-of-the-gs-nitroxide-jp4-039-as-total-body-irradiation-mitigators
#4
Michael W Epperly, Joshua R Sacher, Tanja Krainz, Xiaolin Zhang, Peter Wipf, Mary Liang, Renee Fisher, Song Li, Hong Wang, Joel S Greenberger
BACKGROUND/AIM: Mitochondrial-targeted gramicidin S (GS)-nitroxide, JP4-039, has been demonstrated to be a potent radiation mitigator, and safe over a wide dose range. In addition, JP4-039 has organ-specific effectiveness when locally applied. MATERIALS AND METHODS: We tested the effect of another GS-nitroxide, XJB-5-131, which has more effective mitochondrial localization, and compared these results to those for radiation mitigation against the hematopoietic syndrome, and two analogs of JP4-039, which have the same mitochondrial localization signal, but different chemical payloads: JRS527...
January 2017: In Vivo
https://www.readbyqxmd.com/read/28061904/classifying-high-risk-versus-very-high-risk-prostate-cancer-is-it-relevant-to-outcomes-of-conformal-radiotherapy-and-androgen-deprivation
#5
Akram Saad, Jeffrey Goldstein, Yaacov R Lawrence, Benjamin Spieler, Raya Leibowitz-Amit, Raanan Berger, Tima Davidson, Damien Urban, Lev Tsang, Dror Alezra, Ilana Weiss, Zvi Symon
OBJECTIVE: To evaluate outcomes in prostate cancer patients classified as high-risk (HR) or very high-risk (VHR) who were treated with conformal radiation therapy (CRT) and androgen deprivation therapy (ADT). METHODS: Between 11/2001 and 3/2012, 203 patients with HR disease received CRT to the prostate (78-82 Gy) and pelvic lymph nodes (46-50 Gy) with ADT (6 m-2 years). Median follow-up was 50 months (12 m-142 m). Biochemical failure was defined according to Phoenix definition...
January 6, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28057036/clinical-outcomes-of-stage-i-and-iia-non-small-cell-lung-cancer-patients-treated-with-stereotactic-body-radiotherapy-using-a-real-time-tumor-tracking-radiotherapy-system
#6
Norio Katoh, Itaru Soda, Hiroyasu Tamamura, Shotaro Takahashi, Yusuke Uchinami, Hiromichi Ishiyama, Kiyotaka Ota, Tetsuya Inoue, Rikiya Onimaru, Keiko Shibuya, Kazushige Hayakawa, Hiroki Shirato
PURPOSE: To investigate the clinical outcomes of stage I and IIA non-small cell lung cancer (NSCLC) patients treated with stereotactic body radiotherapy (SBRT) using a real-time tumor-tracking radiotherapy (RTRT) system. MATERIALS AND METHODS: Patterns-of-care in SBRT using RTRT for histologically proven, peripherally located, stage I and IIA NSCLC was retrospectively investigated in four institutions by an identical clinical report format. Patterns-of-outcomes was also investigated in the same manner...
January 5, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28054081/imaging-metals-in-caenorhabditis-elegans
#7
REVIEW
M Aschner, C Palinski, M Sperling, U Karst, T Schwerdtle, J Bornhorst
Systemic trafficking and storage of essential metal ions play fundamental roles in living organisms by serving as essential cofactors in various cellular processes. Thereby metal quantification and localization are critical steps in understanding metal homeostasis, and how their dyshomeostasis might contribute to disease etiology and the ensuing pathologies. Furthermore, the amount and distribution of metals in organisms can provide insight into their underlying mechanisms of toxicity and toxicokinetics. While in vivo studies on metal imaging in mammalian experimental animals are complex, time- and resource-consuming, the nematode Caenorhabditis elegans (C...
January 5, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/28052509/spatially-dependent-biotic-and-abiotic-factors-drive-survivorship-and-physical-structure-of-green-roof-vegetation
#8
Jason M Aloisio, Matthew I Palmer, Mario A Giampieri, Amy R Tuininga, James D Lewis
Plant survivorship depends on biotic and abiotic factors that vary at local and regional scales. This survivorship, in turn, has cascading effects on community composition and the physical structure of vegetation. Survivorship of native plant species is variable among populations planted in environmentally stressful habitats like urban roofs, but the degree to which factors at different spatial scales affect survivorship in urban systems is not well understood. We evaluated the effects of biotic and abiotic factors on survivorship, composition, and physical structure of two native perennial species assemblages, one characterized by a mixture of C4 grasses and forbs (Hempstead Plains, HP) and one characterized by a mixture of C3 grasses and forbs (Rocky Summit, RS), that were initially sown at equal ratios of growth forms (5:1:4; grass, N-fixing forb and non-N-fixing forb) in replicate 2-m(2) plots planted on 10 roofs in New York City (New York, USA)...
January 2017: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28048910/su-g-jep2-10-on-the-need-for-a-dynamic-model-for-patient-specific-distortion-corrections-for-mr-only-pelvis-treatment-planning
#9
C Glide-Hurst, W Zheng, C Stehning, S Weiss, S Renisch
PURPOSE: Patient-specific distortions, particularly near tissue/air interfaces, require assessment and possible corrections for MRI-only radiation treatment planning (RTP). However, patients are dynamic due to changes in physiological status and motion during imaging sessions. This work investigated the need for dynamic patient-specific distortion corrections to support pelvis MR-only RTP. METHODS: The pelvises of healthy volunteers were imaged at 1.0T, 1.5T, and 3...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048728/tu-a-201-01-introduction-to-in-room-imaging-system-characteristics
#10
J Chang
: Recent years have seen a widespread proliferation of available in-room image guidance systems for radiation therapy target localization with many centers having multiple in-room options. In this session, available imaging systems for in-room IGRT will be reviewed highlighting the main differences in workflow efficiency, targeting accuracy and image quality as it relates to target visualization. Decision-making strategies for integrating these tools into clinical image guidance protocols that are tailored to specific disease sites like H&N, lung, pelvis, and spine SBRT will be discussed...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048639/tu-h-209-02-quality-assurance-and-qmp-for-brachytherapy-treatment-delivery-and-treatment-planning-system
#11
M Chilukuri
Learnings Objectives: 1. Although brachytherapy is the oldest form of radiation therapy, the rapid advancement of the methods of dose calculation, treatment planning and treatment delivery pushes us to keep updating our knowledge and experience to new procedures all the time. Our purpose is to present the newest applicators used in Accelerated Partial Breast Irradiation (APBI) and the techniques of using them for a maximum effective treatment. Our objective will be to get the user familiar with the Savi, Contura and ML Mammosite from the detailed description and measurements to cavity eval and choice or size, to acceptance tests and use of each...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048580/we-b-brc-00-concepts-in-risk-based-assessment
#12
Benedick Fraass
: Prospective quality management techniques, long used by engineering and industry, have become a growing aspect of efforts to improve quality management and safety in healthcare. These techniques are of particular interest to medical physics as scope and complexity of clinical practice continue to grow, thus making the prescriptive methods we have used harder to apply and potentially less effective for our interconnected and highly complex healthcare enterprise, especially in imaging and radiation oncology...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048467/su-g-jep2-08-image-guided-radiation-therapy-using-synthetic-cts-in-brain-cancer
#13
R G Price, J Kim, W Zheng, I J Chetty, C Glide-Hurst
PURPOSE: Synthetic-CTs(synCTs) are essential for MR-only treatment planning. However, the performance of synCT for IGRT must be carefully assessed. This work evaluated the accuracy of synCT and synCT-generated DRRs and determined their performance for IGRT in brain cancer radiation therapy. METHODS: MR-SIM and CT-SIM images were acquired of a novel anthropomorphic phantom and a cohort of 12 patients. SynCTs were generated by combining an ultra-short echo time (UTE) sequence with other MRI datasets using voxel-based weighted summation...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048380/th-ab-202-06-best-in-physics-joint-imaging-therapy-a-real-time-tumor-tracking-using-novel-scatter-imaging-modality-during-lung-sbrt
#14
G Cifter, G Redler, C Lee, A Templeton, D Bernard, J Turian, J Chu, Y Liao
PURPOSE: Compared to traditional radiotherapy techniques, stereotactic body radiation therapy (SBRT) provides more favorable outcomes during the treatment of certain lung tumors. Despite advancements in image guidance, accurate target localization still remains a challenge. In this work, we expand our knowledge of a novel scatter imaging modality in order to develop a real-time tumor localization method using scattered photons from the patient during treatment. METHODS: Images of the QUASAR™ Respiratory Motion Phantom were taken by irradiating it on a Varian TrueBeam accelerator...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048156/su-f-j-20-commissioning-and-acceptance-testing-of-the-c-rad-catalysthd-surface-imaging-system
#15
D Stanley, K Rasmussen, N Kirby, N Papanikolaou, A Gutierrez
INTRODUCTION: With the increasing use of surface-based, nonionizing image-guided radiotherapy (IGRT) systems, a comprehensive set of clinical acceptance and commissioning procedures are needed to ensure correct functionality and proper clinical integration. Although TG-147 provides a specific set of parameters, measurement methodologies have yet to be described. The aim of this study was to provide a comprehensive overview of the commissioning and acceptance analysis performed for the C-Rad CatalystHD imaging system...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048068/tu-a-201-02-treatment-site-specific-considerations-for-clinical-igrt
#16
K Wijesooriya
: Recent years have seen a widespread proliferation of available in-room image guidance systems for radiation therapy target localization with many centers having multiple in-room options. In this session, available imaging systems for in-room IGRT will be reviewed highlighting the main differences in workflow efficiency, targeting accuracy and image quality as it relates to target visualization. Decision-making strategies for integrating these tools into clinical image guidance protocols that are tailored to specific disease sites like H&N, lung, pelvis, and spine SBRT will be discussed...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047974/tu-h-209-03-planning-and-treatment-delivery-for-apbi-using-savi-contura-and-ml-mammosite
#17
S Pella
Learnings Objectives: 1. Although brachytherapy is the oldest form of radiation therapy, the rapid advancement of the methods of dose calculation, treatment planning and treatment delivery pushes us to keep updating our knowledge and experience to new procedures all the time. Our purpose is to present the newest applicators used in Accelerated Partial Breast Irradiation (APBI) and the techniques of using them for a maximum effective treatment. Our objective will be to get the user familiar with the Savi, Contura and ML Mammosite from the detailed description and measurements to cavity eval and choice or size, to acceptance tests and use of each...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047920/we-b-brc-01-current-methodologies-in-risk-assessment
#18
F Rath
: Prospective quality management techniques, long used by engineering and industry, have become a growing aspect of efforts to improve quality management and safety in healthcare. These techniques are of particular interest to medical physics as scope and complexity of clinical practice continue to grow, thus making the prescriptive methods we have used harder to apply and potentially less effective for our interconnected and highly complex healthcare enterprise, especially in imaging and radiation oncology...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047826/we-ab-207b-02-a-bayesian-network-approach-for-joint-prediction-of-tumor-control-and-radiation-pneumonitis-rp-in-non-small-cell-lung-cancer-nsclc
#19
Y Luo, D McShan, M Matuszak, S Hobson, S Jolly, R Ten Haken, I El Naqa
PURPOSE: NSCLC radiotherapy treatment is a trade-off between controlling the tumor while limiting radiation-induced toxicities. Here we identify hierarchical biophysical relationships that could simultaneously influence both local control (LC) and RP by using an integrated Bayesian Networks (BN) approach. METHODS: We studied 79 NSCLC patients treated on prospective protocol with 56 cases of LC and 21 events of RP. Beyond dosimetric information, each patient had 193 features including 12 clinical factors, 60 circulating blood cytokines before and during radiotherapy, 62 microRNAs, and 59 single-nucleotide polymorphisms (SNPs)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047756/we-ab-207b-09-margin-reduction-for-planning-target-volume-ptv-in-patients-with-localized-prostate-cancer-impact-on-delivered-dose-and-quality-of-life
#20
A Kumarasiri, C Liu, S Brown, C Glide-Hurst, M Elshaikh, I Chetty, B Movsas
PURPOSE: To estimate the delivered (cumulative) dose to targets and organs at risk for localized prostate cancer patients treated with reduced PTV margins and to evaluate preliminary patient reported quality-of-life (QOL). METHODS: Under an IRB-approved protocol, 20 prostate cancer patients (including 11 control patients) were treated with reduced planning margins (5 mm uniform with 4 mm at prostate/rectum interface). Control patients had standard margin (10/6 mm)-based treatments...
June 2016: Medical Physics
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