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Skeletons

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https://www.readbyqxmd.com/read/29793143/oxidation-at-c-16-enhances-butyrylcholinesterase-inhibition-in-lupane-triterpenoids
#1
María Julia Castro, Victoria Richmond, María Belén Faraoni, Ana Paula Murray
A set of triterpenoids with different grades of oxidation in the lupane skeleton were prepared and evaluated as cholinesterase inhibitors. Allylic oxidation with selenium oxide and Jones's oxidation were employed to obtain mono-, di- and tri-oxolupanes, starting from calenduladiol (1) and lupeol (3). All the derivatives showed a selective inhibition of butyrylcholinesterase over acetylcholinesterase (BChE vs. AChE). A kinetic study proved that compounds 2 and 9, the more potent inhibitors of the series, act as competitive inhibitors...
May 17, 2018: Bioorganic Chemistry
https://www.readbyqxmd.com/read/29792705/total-synthesis-of-boletopsin-11-enabled-by-directed-ortho-c-sp-2-h-arylation
#2
Meng Yao Zhang, Russell A Barrow
A nine-step synthesis of boletopsin 11 (1), a bioactive fungal natural product, is disclosed. Key features include a one-pot [O]-oxa-Michael cascade to establish the polyoxygenated dibenzofuran core followed by a Pd-catalyzed directed ortho-C(sp2 )-H arylation to complete the fully functionalized carbon skeleton. Exploration of the latter transformation led to the discovery of an unexpected tandem ortho-C(sp2 )-H arylation event, and the scope of the directed ortho-C(sp2 )-H reaction was further investigated with coupling partners varying in stereoelectronic properties...
May 24, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29792378/location-and-distribution-of-craniomaxillofacial-fractures-in-45-cats-presented-for-the-treatment-of-head-trauma
#3
Ingrid Tundo, Peter Southerden, Andrew Perry, Richard M Haydock
Objectives The aim of this retrospective study was to describe the location and distribution of craniomaxillofacial (CMF) fractures in 45 cats presented to a veterinary referral centre between 2012 and 2017. Methods Cats with a history of head trauma, one or more CMF fractures and a pretreatment CT scan of the CMF region were included in this study. For the purpose of the study, the CMF skeleton was divided into 15 functional anatomical regions and the fracture sites were allocated to one of these functional regions...
May 1, 2018: Journal of Feline Medicine and Surgery
https://www.readbyqxmd.com/read/29790426/long-term-effects-of-simulated-microgravity-and-vibration-exposure-on-skeletal-development-in-zebrafish
#4
Tamara A Franz-Odendaal, Sara Edsall
Most studies utilising fish to study the effects of simulated microgravity (SMG) only observe the effects during the first week of development. They also do not take into account the potential impact on development of vibrations caused by the equipment. Here we analyse the effects of both SMG and vibration on development of the skeleton. We analyse three different exposure durations and starting points that coincide with cranial neural crest cell migration. We use a combination of bone staining and morphometrics to analyse the effects...
May 23, 2018: Stem Cells and Development
https://www.readbyqxmd.com/read/29788984/f-18-fdg-pet-ct-in-26-patients-with-sapho-syndrome-a-new-vision-of-clinical-and-bone-scintigraphy-correlation
#5
Xiaochuan Sun, Chen Li, Yihan Cao, Ximin Shi, Li Li, Weihong Zhang, Xia Wu, Nan Wu, Hongli Jing, Wen Zhang
BACKGROUNDS: Whole-body bone scintigraphy (WBBS) and MRI are widely used in assessment of patients with synovitis, acne, pustulosis, hyperostosis, and osteitis (SAPHO) syndrome. However, the value of F-18 fluorodeoxyglucose-positron emission tomography/computed tomography (18 F-FDG PET/CT) in SAPHO syndrome was unclear. The aim of this study was to characterize the manifestation of SAPHO syndrome on 18 F-FDG PET/CT and explore its relationship with clinical symptoms and WBBS. METHODS: Twenty-six patients who suffered from SAPHO syndrome and had undergone whole-body 18 F-FDG PET/CT were recruited in Peking Union Medical College Hospital from 2004 to 2016...
May 22, 2018: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/29788923/the-segmentation-of-bones-in-pelvic-ct-images-based-on-extraction-of-key-frames
#6
Hui Yu, Haijun Wang, Yao Shi, Ke Xu, Xuyao Yu, Yuzhen Cao
BACKGROUND: Bone segmentation is important in computed tomography (CT) imaging of the pelvis, which assists physicians in the early diagnosis of pelvic injury, in planning operations, and in evaluating the effects of surgical treatment. This study developed a new algorithm for the accurate, fast, and efficient segmentation of the pelvis. METHODS: The proposed method consists of two main parts: the extraction of key frames and the segmentation of pelvic CT images...
May 22, 2018: BMC Medical Imaging
https://www.readbyqxmd.com/read/29788199/influences-of-trace-mineral-nutrition-and-maternal-flock-age-on-broiler-embryo-bone-development
#7
C A Torres, D R Korver
At hatch, the chick skeleton is a miniature of that of the adult bird. The hen deposits calcium, phosphorus, and trace minerals (copper, zinc, and manganese) along with vitamin D into the egg to allow development of the embryonic skeleton. The main source of calcium is the eggshell, whereas phosphorus, trace minerals, and vitamin D are mainly derived from the yolk. Calcium is absorbed from the eggshell and transferred to the embryo and yolk through the chorioallantoic membrane, whereas phosphorus and trace minerals are simultaneously mobilized by the yolk sac membrane...
May 21, 2018: Poultry Science
https://www.readbyqxmd.com/read/29787431/rapid-response-dose-assessment-and-clinical-management-of-a-plutonium-contaminated-puncture-wound
#8
Stephen L Sugarman, William M Findley, Richard E Toohey, Nicholas Dainiak
Internalization of radionuclides occurs not only by inhalation, ingestion, parenteral injection (i.e., administration of radioactive material for a medical purpose), and direct transdermal absorption, but also by contaminated wounds. In June 2010, a glove-box operator at the U.S. Department of Energy's Savannah River Site sustained a puncture wound while venting canisters containing legacy materials contaminated with Pu. To indicate the canisters had been vented, a flag was inserted into the vent hole. The shaft of the flag penetrated the protective gloves worn by the operator...
July 2018: Health Physics
https://www.readbyqxmd.com/read/29786463/hybrid-diffusion-imaging-in-mild-traumatic-brain-injury
#9
Yu-Chien Wu, Sourajit Mitra Mustafi, Jaroslaw Harezlak, Chandana Kodiweera, Laura A Flashman, Thomas McAllister
Mild traumatic brain injury (mTBI) is an important public health problem. Although conventional medical imaging techniques can detect moderate-to-severe injuries, they are relatively insensitive to mTBI. In this study, we used hybrid diffusion imaging (HYDI) to detect white-matter alterations in nineteen patients with mTBI and 23 other trauma-control patients. Within 15 days (SD=10) of brain injury, all subjects underwent magnetic-resonance HYDI and were assessed with battery of neuropsychological tests of sustained attention, memory, and executive function...
May 22, 2018: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29785931/first-bone-cracking-dog-coprolites-provide-new-insight-into-bone-consumption-in-borophagus-and-their-unique-ecological-niche
#10
Xiaoming Wang, Stuart C White, Mairin Balisi, Jacob Biewer, Julia Sankey, Dennis Garber, Z Jack Tseng
Borophagine canids have long been hypothesized to be North American ecological 'avatars' of living hyenas in Africa and Asia, but direct fossil evidence of hyena-like bone consumption is hitherto unknown. We report rare coprolites (fossilized feces) of Borophagus parvus from the late Miocene of California and, for the first time, describe unambiguous evidence that these predatory canids ingested large amounts of bone. Surface morphology, micro-CT analyses, and contextual information reveal (1) droppings in concentrations signifying scent-marking behavior, similar to latrines used by living social carnivorans; (2) routine consumption of skeletons; (3) undissolved bones inside coprolites indicating gastrointestinal similarity to modern striped and brown hyenas; (4) B...
May 22, 2018: ELife
https://www.readbyqxmd.com/read/29785743/four-new-diterpenoid-alkaloids-from-the-roots-of-aconitum-carmichaelii
#11
Yu Li, Feng Gao, Ji-Fa Zhang, Xian-Li Zhou
Aconitum carmichaelii, belonging to the Ranunculaceae family, is mainly distributed and cultivated in southwestern China. Its parent and lateral roots, two well-known traditional medicinal materials, are commonly called as "Chuanwu" and "Fuzi" in China, respectively. A. carmichaelii is widely used for the treatment of cadianeuria, neuralgia, and rheumatalgia in Chinese medicine. According to the pharmacology studies, diterpenoid alkaloids accounted for the major effects and toxicity of this plant, such as hypaconitine, mesaconitine, aconitine...
May 21, 2018: Chemistry & Biodiversity
https://www.readbyqxmd.com/read/29785343/perinatal-specimens-of-maiasaura-from-the-upper-cretaceous-of-montana-usa-insights-into-the-early-ontogeny-of-saurolophine-hadrosaurid-dinosaurs
#12
Albert Prieto-Marquez, Merrilee F Guenther
Perinatal specimens of hadrosaurids discovered in the late 1970's by field crews from Princeton University were significant in providing evidence of the early ontogenetic stages in North American dinosaurs. These specimens from the Campanian (Upper Cretaceous) Two Medicine Formation of Montana consist of over a dozen skeletons referable to the saurolophine hadrosaurid Maiasaura peeblesorum , but never fully figured or described. Here, we provide a more complete documentation of the morphology of these specimens, along with an examination of variation during a large span of the development of saurolophine hadrosaurids...
2018: PeerJ
https://www.readbyqxmd.com/read/29785160/observational-study-of-the-bisphosphonate-related-osteonecrosis-of-jaws
#13
Andreea Elena Lungu, Madalina Anca Lazar, Andrada Tonea, Horatiu Rotaru, Rares Calin Roman, Mindra Eugenia Badea
Introduction: The bisphosphonate-related osteonecrosis of the jaw was first referred to in 2003. Bisphosphonates action is focused on the osteoclasts. The drastic inhibition of the osteoclastic function is harmful for the jaws which are the only bones of the human skeleton in relative contact with the external environment. The adverse effects of the bisphosphonate-related therapy include the pathology for which they are prescribed, the atypical fractures in pathological bone. Method: The aim of this research was to analyze the risk factors and the treatment methods in case of osteonecrosis of the jaws...
2018: Clujul Medical (1957)
https://www.readbyqxmd.com/read/29784959/commercially-available-natural-benzyl-esters-and-their-synthetic-analogs-exhibit-different-toxicities-against-insect-pests
#14
Yan Feng, Jian Chen, Aijun Zhang
Benzyl methyl ester, also known as methyl benzoate (MB), is a volatile organic compound that exists naturally as a floral fragrance in many plants. Our behavioral bioassays show that MB and some of its naturally occurring and synthetic analogs kill insects at different life stages. Compared to commercial pesticides containing pyriproxyfen and acetamiprid, MB and some analogs are 1.3 to 3.4 times more toxic to gypsy moth larvae and brown marmorated stinkbug nymphs. The arthropod repellent DEET is also a benzyl ester, and shares the same chemical skeleton with MB...
May 21, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29784805/direct-evidence-of-a-large-northern-european-roman-period-martial-event-and-post-battle-corpse-manipulation
#15
Mads Kähler Holst, Jan Heinemeier, Ejvind Hertz, Peter Jensen, Mette Løvschal, Lene Mollerup, Bent Vad Odgaard, Jesper Olsen, Niels Emil Søe, Søren Munch Kristiansen
New archaeological excavations at Alken Enge, Jutland, Denmark, have revealed a comprehensive assemblage of disarticulated human remains within a 75-ha wetland area. A minimum of 82 individuals have been uncovered. Based on the distribution, the total population is estimated to be greater than 380 individuals, exclusively male and predominantly adult. The chronological radiocarbon evidence of the human bones indicates that they belong to a single, large event in the early first century AD. The bones show a high frequency of unhealed trauma from sharp-edged weapons, which, together with finds of military equipment, suggests that the find is of martial character...
May 21, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29783691/old-and-young-actors-playing-novel-roles-in-the-drama-of-multiple-myeloma-bone-marrow-microenvironment-dependent-drug-resistance
#16
REVIEW
Sabrina Manni, Marilena Carrino, Gianpietro Semenzato, Francesco Piazza
Multiple myeloma (MM) is the second most frequent hematologic cancer. In addition to the deleterious effects of neoplastic plasma cell growth and spreading during the disease evolution, this tumor is characterized by the serious pathological consequences due to the massive secretion of monoclonal immunoglobulins and by the derangement of bone physiology with progressive weakening of the skeleton. Despite significant progresses having been made in the last two decades in the therapeutic management of this plasma cell tumor, MM remains invariably lethal, due to its extremely complex genetic architecture and to the constant protection it receives from the tumor niche, which is represented by the bone marrow microenvironment...
May 18, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29783651/effect-of-microwave-radiation-power-on-the-size-of-aggregates-of-zno-nps-prepared-using-microwave-solvothermal-synthesis
#17
Jacek Wojnarowicz, Tadeusz Chudoba, Stanisław Gierlotka, Witold Lojkowski
This paper reports the possibility of changing the size of zinc oxide nanoparticles (ZnO NPs) aggregates through a change of synthesis parameters. The effect of the changed power of microwave heating on the properties of ZnO NPs obtained by the microwave solvothermal synthesis from zinc acetate dissolved in ethylene glycol was tested for the first time. It was found that the size of ZnO aggregates ranged from 60 to 120 nm depending on the power of microwave radiation used in the synthesis of ZnO NPs. The increase in the microwave radiation power resulted in the reduction of the total synthesis time with simultaneous preservation of the constant size and shape of single ZnO NPs, which were synthesized at a pressure of 4 bar...
May 18, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29782674/molecularly-imprinted-porous-aromatic-frameworks-serving-as-porous-artificial-enzymes
#18
Ye Yuan, Yajie Yang, Muhammad Faheem, Xiaoqin Zou, Xujiao Ma, Zeyu Wang, Qinghao Meng, Lili Wang, Shuai Zhao, Guangshan Zhu
Artificially designed enzymes are in demand as ideal catalysts for industrial production but their dense structure conceals most of their functional fragments, thus detracting from performance. Here, molecularly imprinted porous aromatic frameworks (MIPAFs) which are exploited to incorporate full host-guest interactions of porous materials within the artificial enzymes are presented. By decorating a porous skeleton with molecularly imprinted complexes, it is demonstrated that MIPAFs are porous artificial enzymes possessing excellent kinetics for guest molecules...
May 21, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29781839/modeling-the-skeleton-weight-of-an-adult-caucasian-man
#19
Maia Avtandilashvili, Sergei Y Tolmachev
The reference value for the skeleton weight of an adult male (10.5 kg) recommended by the International Commission on Radiological Protection in Publication 70 is based on weights of dissected skeletons from 44 individuals, including two U.S. Transuranium and Uranium Registries whole-body donors. The International Commission on Radiological Protection analysis of anatomical data from 31 individuals with known values of body height demonstrated significant correlation between skeleton weight and body height...
May 17, 2018: Health Physics
https://www.readbyqxmd.com/read/29781818/lower-extremity-megaprostheses-in-orthopaedic-oncology
#20
Santiago A Lozano Calderón, Joseph Kuechle, Kevin A Raskin, Francis J Hornicek
The megaprosthesis is designed to reproduce the form and function of a removed or lost large segment of bone and accompanying soft tissues. Slow but substantial improvements in the design and surgical implementation of these devices have advanced the capacity to restore patients' functional abilities. The essential challenges include identifying the ideal materials, bonding these materials to bone and soft tissues, reproducing functional anatomy, and adapting to the growing skeleton. Failure of these devices can result from soft-tissue insufficiency, aseptic loosening, structural failures, infection, and tumor recurrence...
May 17, 2018: Journal of the American Academy of Orthopaedic Surgeons
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