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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
#1
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/29784847/translation-elongation-factor-4-lepa-contributes-to-tetracycline-susceptibility-by-stalling-elongating-ribosomes
#2
Bin Liu, Chunlai Chen
Even though elongation factor 4 (EF4) is the third most conserved protein in bacteria, its physiological functions remain largely unknown and its proposed molecular mechanisms are conflicting among previous studies. In the present study we show that growth of an Escherichia coli strain is more susceptible to tetracycline than its EF4 knockout strain. In consistence with previous studies, our results suggested that EF4 affects ribosome biogenesis when tetracycline is present. Through ribosome profiling analysis, we discovered that EF4 causes 1-nucleotide shifting of ribosomal footprints on mRNA when cells have been exposed to tetracycline...
May 21, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29784768/b-alleviates-al-toxicity-by-promoting-alkalization-in-root-transition-zone-via-polar-auxin-transport
#3
Xuewen Li, Ya Lin Li, Jingwen Mai, Lin Tao, Mei Qu, Jia You Liu, Ren Fang Shen, Gui Lian Xu, Ying Ming Feng, Hong Dong Xiao, Li Shu Wu, Lei Shi, Shao Xue Guo, Jian Liang, Yiyong Zhu, Yongming He, Frantisek Baluska, Sergey Shabala, Min Yu
Boron (B) supply alleviates aluminum (Al) toxicity in higher plants. The underlying mechanisms behind this phenomenon remain elusive. Here we demonstrate that B promotes, while Al inhibits, surface pH gradients, leading to alkalization in the root transition zone and acidification in the elongation zone, as shown by using a bromocresol green pH indicator. B supply significantly decreased Al accumulation in the transition zone (~ 1.0-2.5 mm from the apex) of lateral pea (Pisum sativum) roots, thus alleviated Al-induced inhibition of root elongation...
May 21, 2018: Plant Physiology
https://www.readbyqxmd.com/read/29783971/posterior-urethral-valves-10-years-audit-of-epidemiologic-diagnostic-and-therapeutic-aspects-in-yaound%C3%A3-gynaeco-obstetric-and-paediatric-hospital
#4
Faustin Felicien Mouafo Tambo, Paul Nkemtendong Tolefac, Marcelin Ngowe Ngowe, Jacqueline Ze Minkande, Landry Mbouche, Georgette Guemkam, Neville Alemnju Telelen, Fru Fobuzshi Angwafo, Aurelien Maurice Sosso
BACKGROUND: The incidence of posterior urethral valve (PUV) is estimated at 1:5000-1:8000 males. It is the most common paediatric urologic urgency and the most common cause of male obstructive uropathy and chronic renal failure in children. The study aimed to describe the experience of Yaoundé gynaeco-obstetrics and paediatric hospital in the management of PUV. METHODS: Retrospectively, medical records were retrieved over a ten year period and all data recorded and analyzed for study objectives...
May 21, 2018: BMC Urology
https://www.readbyqxmd.com/read/29783713/microfluidic-cultivation-and-laser-tweezers-raman-spectroscopy-of-e-coli-under-antibiotic-stress
#5
Zdeněk Pilát, Silvie Bernatová, Jan Ježek, Johanna Kirchhoff, Astrid Tannert, Ute Neugebauer, Ota Samek, Pavel Zemánek
Analyzing the cells in various body fluids can greatly deepen the understanding of the mechanisms governing the cellular physiology. Due to the variability of physiological and metabolic states, it is important to be able to perform such studies on individual cells. Therefore, we developed an optofluidic system in which we precisely manipulated and monitored individual cells of Escherichia coli . We tested optical micromanipulation in a microfluidic chamber chip by transferring individual bacteria into the chambers...
May 18, 2018: Sensors
https://www.readbyqxmd.com/read/29783149/potential-of-near-infrared-spectroscopy-for-quality-evaluation-of-cattle-leather
#6
Carlos Eduardo M Braz, Manuel Antonio C Jacinto, Edenir R Pereira-Filho, Gilberto B Souza, Ana Rita A Nogueira
Models using near-infrared spectroscopy (NIRS) were constructed based on physical-mechanical tests to determine the quality of cattle leather. The following official parameters were used, considering the industry requirements: tensile strength (TS), percentage elongation (%E), tear strength (TT), and double hole tear strength (DHS). Classification models were constructed with the use of k-nearest neighbor (kNN), soft independent modeling of class analogy (SIMCA), and partial least squares-discriminant analysis (PLS-DA)...
May 9, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29782946/delivery-of-the-improved-bmp-2-advanced-plasmid-dna-within-a-gene-activated-scaffold-accelerates-mesenchymal-stem-cell-osteogenesis-and-critical-size-defect-repair
#7
Rosanne M Raftery, Irene Mencía-Castaño, Simon Sperger, Gang Chen, Brenton Cavanagh, Georg Feichtinger, Heinz Redl, Ara Hacobian, Fergal J O'Brien
Gene-activated scaffolds have been shown to induce controlled, sustained release of functional transgene both in vitro and in vivo. Bone morphogenetic proteins (BMPs) are potent mediators of osteogenesis however we found that the delivery of plasmid BMP-2 (pBMP-2) alone was not sufficient to enhance bone formation. Therefore, the aim of this study was to assess if the use of a series of modified BMP-2 plasmids could enhance the functionality of a pBMP-2 gene-activated scaffold and ultimately improve bone regeneration when implanted into a critical sized bone defect in vivo...
May 18, 2018: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29782483/magnolol-and-honokiol-attenuate-apoptosis-of-enterotoxigenic-escherichia-coli-induced-intestinal-epithelium-by-maintaining-secretion-and-absorption-homeostasis-and-protecting-mucosal-integrity
#8
Yanli Deng, Xuefeng Han, Shaoxun Tang, Chengjian Li, Wenjun Xiao, Zhiliang Tan
BACKGROUND The cortex of Magnolia officinalis has long been used as an element of traditional Chinese medicine for the treatment of anxiety, chronic bronchitis, and gastrointestinal dysfunction. This study aimed to elucidate the underlying mechanism of its functional ingredients (magnolol and honokiol) in modifying the secretion and absorption homeostasis and protecting mucosal integrity in an Enterotoxigenic Escherichia coli (ETEC)-induced diarrhea mouse model. MATERIAL AND METHODS This study established a diarrhea mouse model infected by ETEC at a dosage of 0...
May 21, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29781181/effects-of-phosphatidylserine-containing-supported-lipid-bilayers-on-the-polarization-of-macrophages
#9
Hongxuan Quan, Yongjoon Kim, Hee Chul Park, Hyeong-Cheol Yang
Placement of dental implants initiates inflammatory foreign body response, in which macrophages play a central role and affect the subsequent tissue healing process such as bone formation. The purpose of this study was to fabricate phosphatidylserine (PS)-containing supported lipid bilayers (SLBs) on a titanium surface to regulate the polarization of macrophages, a critical factor that affects following tissue healing and regeneration. The fluorescent recovery after photobleaching (FRAP) images showed that the percentage of PS had a critical influence on the fluidity, and 20% PS had the highest fluidity...
May 20, 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29781015/attenuation-of-pressure-dips-underneath-piles-of-spherocylinders
#10
Haiyang Zhao, Xizhong An, Dazhao Gou, Bo Zhao, Runyu Yang
The discrete element method (DEM) was used to simulate the piling of rod-like (elongated sphero-cylindrical) particles, mainly focusing on the effect of particle shape on the structural and force properties of the piles. In this work, rod-like particles of different aspect ratios were discharged on a flat surface to form wedge-shaped piles. The surface properties of the piles were characterized in terms of angle of repose and stress at the bottom of the piles. The results showed that the rise of the angle of repose became slower with the increase of particle aspect ratio...
May 21, 2018: Soft Matter
https://www.readbyqxmd.com/read/29780952/arterial-macroaneurysm-of-the-optic-disc
#11
Cem Ozgonul, Cagri Giray Besirli
Purpose: We present fundus and spectral domain optical coherence tomography findings of a patient with an arterial macroaneurysm of the optic disc. Observations: An 87-year-old woman presented with blurry vision and was found to have a retinal arterial macroaneurysm on the optic disc. Spectral domain optical coherence tomography revealed abnormal saccular arterial dilatation on the disc with an elongation anteriorly and superficial prepapillary hemorrhages. After 2 months, aneurysm thrombosed spontaneously without any visual consequences...
June 2018: American Journal of Ophthalmology Case Reports
https://www.readbyqxmd.com/read/29780843/adjustable-versus-fixed-loop-devices-for-femoral-fixation-in-acl-reconstruction-an-in-vitro-full-construct-biomechanical-study-of-surgical-technique-based-tibial-fixation-and-graft-preparation
#12
Patrick A Smith, Marina Piepenbrink, Shelby K Smith, Samuel Bachmaier, Asheesh Bedi, Coen A Wijdicks
Background: Femoral suspensory fixation for anterior cruciate ligament (ACL) reconstruction has evolved from fixed- to adjustable-loop devices. However, there are still controversies regarding undesired lengthening of adjustable-loop devices. Hypothesis: Adjustable-loop fixation will achieve similar elongation to that of fixed-loop devices, and intraoperative preconditioning will reduce initial elongation for adjustable-loop constructs. Study Design: Controlled laboratory study...
April 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29780683/cyclic-lipopeptide-biosurfactant-from-bacillus-tequilensis-exhibits-multifarious-activity
#13
Arun Kumar Pradhan, Animesha Rath, Nilotpala Pradhan, Rupenangshu Kumar Hazra, Rati Ranjan Nayak, Sanjit Kanjilal
Bacillus tequilensis strain CH had been previously shown to produce a biosurfactant. In this study, chemical structure of the purified biosurfactant was determined by using high performance liquid chromatography and liquid chromatography-mass spectroscopy as a 10 amino acid cyclic lipopeptide (CL). The cyclic lipopeptide was found to be active against Anopheles culicifacies larvae with a LC50 of 110 µg/ml in 2 days. 1 ppm cadmium (Cd) which had a profound mutagenic effect on the cell division of onion ( Allium cepa ) root tip cell resulting in abnormal metaphase, abnormal anaphase and nuclei elongation was partially reversed in the presence of 0...
June 2018: 3 Biotech
https://www.readbyqxmd.com/read/29780670/unfolding-of-%C3%AE-helical-20-residue-poly-glutamic-acid-analyzed-by-multiple-runs-of-canonical-molecular-dynamics-simulations
#14
Naoki Ogasawara, Kota Kasahara, Ryosuke Iwai, Takuya Takahashi
Elucidating the molecular mechanism of helix-coil transitions of short peptides is a long-standing conundrum in physical chemistry. Although the helix-coil transitions of poly-glutamic acid (PGA) have been extensively studied, the molecular details of its unfolding process still remain unclear. We performed all-atom canonical molecular dynamics simulations for a 20-residue PGA, over a total of 19 μs, in order to investigate its helix-unfolding processes in atomic resolution. Among the 28 simulations, starting with the α-helical conformation, all showed an unfolding process triggered by the unwinding of terminal residues, rather than by kinking and unwinding of the middle region of the chain...
2018: PeerJ
https://www.readbyqxmd.com/read/29780613/schwann-cell-durotaxis-can-be-guided-by-physiologically-relevant-stiffness-gradients
#15
Elisabeth B Evans, Samantha W Brady, Anubhav Tripathi, Diane Hoffman-Kim
Background: Successful nerve regeneration depends upon directed migration of morphologically specialized repair state Schwann cells across a nerve defect. Although several groups have studied directed migration of Schwann cells in response to chemical or topographic cues, the current understanding of how the mechanical environment influences migration remains largely understudied and incomplete. Therefore, the focus of this study was to evaluate Schwann cell migration and morphodynamics in the presence of stiffness gradients, which revealed that Schwann cells can follow extracellular gradients of increasing stiffness, in a form of directed migration termed durotaxis...
2018: Biomaterials Research
https://www.readbyqxmd.com/read/29780440/an-algorithmic-approach-to-the-management-of-infantile-digital-fibromatosis-review-of-literature-and-a-case-report
#16
Elizabeth H Eypper, Johnson C Lee, Ashley J Tarasen, Maxene H Weinberg, Oluwaseun A Adetayo
Objective: Infantile digital fibromatosis is a rare benign childhood tumor, infrequently cited in the literature. Hallmarks include nodular growths exclusive to fingers and toes and the presence of eosinophilic cytoplasmic inclusions on histology. This article aims to exemplify diagnoses of infantile digital fibromatosis and possible treatment options. Methods: A computerized English literature search was performed in the PubMed/MEDLINE database using MeSH headings "infantile," "juvenile," "digital," and "fibromatosis...
2018: Eplasty
https://www.readbyqxmd.com/read/29780400/led-lighting-modification-of-growth-metabolism-yield-and-flour-composition-in-wheat-by-spectral-quality-and-intensity
#17
István Monostori, Márk Heilmann, Gábor Kocsy, Marianna Rakszegi, Mohamed Ahres, Susan B Altenbach, Gabriella Szalai, Magda Pál, Dávid Toldi, Livia Simon-Sarkadi, Noémi Harnos, Gábor Galiba, Éva Darko
The use of light-emitting diode (LED) technology for plant cultivation under controlled environmental conditions can result in significant reductions in energy consumption. However, there is still a lack of detailed information on the lighting conditions required for optimal growth of different plant species and the effects of light intensity and spectral composition on plant metabolism and nutritional quality. In the present study, wheat plants were grown under six regimens designed to compare the effects of LED and conventional fluorescent lights on growth and development, leaf photosynthesis, thiol and amino acid metabolism as well as grain yield and flour quality of wheat...
2018: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29779663/identification-of-enzymes-involved-in-sesterterpene-biosynthesis-in-marine-fungi
#18
Jingjing Yan, Jingjing Guo, Wei Yuan, Wanying Mai, Kui Hong
Diverse and bioactive terpene compounds are produced by marine fungi. The biosynthesis of sesterterpene molecules containing a C25 skeleton is catalyzed by chimeric enzymes that carry out both chain elongation and terpene cyclization reactions. These bifunctional characteristics facilitate using different chain length polyisoprenoid diphosphates as precursors to yield the geranylfarnesyl diphosphate intermediate, which is then converted to a sesterterpene in one step. In this chapter, we describe the identification of sesterterpene synthase enzymes, together with other related enzymes such as diterpene and farnesyl diphosphate synthases, in a single fungal strain...
2018: Methods in Enzymology
https://www.readbyqxmd.com/read/29779647/in-vitro-susceptibility-and-multilocus-sequence-typing-of-fusarium-isolates-causing-keratitis
#19
P Dallé da Rosa, A Nunes, R Borges, B Batista, A Meneghello Fuentefria, L Z Goldani
Fungal keratitis is recognized as a significant cause of ocular morbidity and blindness especially in developing countries. In this study, we aimed to present the molecular identification and susceptibility of Fusarium isolates causing fungal keratitis in a university hospital in southern Brazil. The samples were identified using the second largest subunit of the RNA polymerase gene (RPB2) and the translation elongation factor 1-alpha (TEF1), while the antifungal susceptibility was tested by the broth microdilution method according to the Clinical and Laboratory Standards Institute (CLSI) methodology...
May 17, 2018: Journal de Mycologie Médicale
https://www.readbyqxmd.com/read/29779265/morphology-and-phylogenetic-position-of-gruberia-lanceolata-gruber-1884-ciliophora-heterotrichea-from-rio-de-janeiro-brazil
#20
Pedro H Campello-Nunes, Noemi M Fernandes, Franziska Szokoli, Giulio Petroni, Inácio D da Silva-Neto
Ciliates of the genus Gruberia are poorly studied. Consequently, most species lack detailed morphological descriptions, and all gene sequences in GenBank are not classified at the species level. In this study, a detailed morphological description of a population of G. lanceolata from Brazil is presented, based on live and protargol-stained organisms. We also present the 18S rRNA gene sequence and the phylogenetic position of this species. The primary characteristics of G. lanceolata from the Maricá Lagoon are as follows: an elongate fusiform body 280-870 × 40-160 μm in size; rosy cortical granules; a peristome occupying approximately 1/3-1/2 of body length; an adoral zone comprising 115-330 membranelles; a paroral membrane in 35-50 fragments; and a moniliform macronucleus with 11-16 nodules...
May 19, 2018: Journal of Eukaryotic Microbiology
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