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Morphological plasticity

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https://www.readbyqxmd.com/read/29334539/gelatin-based-hemostatic-agents-histopathologic-differences
#1
Natalie Wolkow, Frederick A Jakobiec, Michael K Yoon
PURPOSE: To delineate the histopathologic appearance of gelatin-based hemostatic agents, Surgiflo, Gelfoam, and Floseal, which are used by ophthalmic plastic surgeons, and which may incidentally be found as foreign materials in histopathologic tissue samples. METHODS: Histopathologic analysis was performed with hematoxylin-eosin, periodic acid-Schiff, Masson trichrome, and elastin staining on tissue samples in which gelatin-based agents were found. To better characterize these materials, similar analyses were performed on in vitro samples of commonly used gelatin-based hemostatic agents...
January 12, 2018: Ophthalmic Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/29334421/a-survey-of-tooth-morphology-teaching-methods-employed-in-the-united-kingdom-and-ireland
#2
M Lone, J P McKenna, J F Cryan, E J Downer, A Toulouse
BACKGROUND: Tooth morphology is a central component of the dental curriculum and is applicable to all dental specialities. Traditional teaching methods are being supplemented with innovative strategies to tailor teaching and accommodate the learning styles of the recent generation of students. METHODS: An online survey was compiled and distributed to the staff involved in teaching tooth morphology in the United Kingdom and Ireland to assess the importance of tooth morphology in the dentistry curriculum and the methodologies employed in teaching...
January 15, 2018: European Journal of Dental Education: Official Journal of the Association for Dental Education in Europe
https://www.readbyqxmd.com/read/29334293/dna-barcoding-for-species-identification-in-deep-sea-clams-mollusca-bivalvia-vesicomyidae
#3
Jun Liu, Haibin Zhang
Deep-sea clams (Bivalvia: Vesicomyidae) have been found in reduced environments over the world oceans, but taxonomy of this group remains confusing at species and supraspecific levels due to their high-morphological similarity and plasticity. In the present study, we collected mitochondrial COI sequences to evaluate the utility of DNA barcoding on identifying vesicomyid species. COI dataset identified 56 well-supported putative species/operational taxonomic units (OTUs), approximately covering half of the extant vesicomyid species...
January 15, 2018: Mitochondrial DNA. Part A. DNA Mapping, Sequencing, and Analysis
https://www.readbyqxmd.com/read/29330187/acquisition-of-a-novel-sulfur-oxidizing-symbiont-in-the-gutless-marine-worm-inanidrilus-exumae
#4
C Bergin, C Wentrup, N Brewig, A Blazejak, C Erséus, O Giere, M Schmid, P De Wit, N Dubilier
Gutless phallodrilines are marine annelid worms without a mouth or gut, which live in an obligate association with multiple bacterial endosymbionts that supply them with nutrition. In this study, we discovered an unusual symbiont community in the gutless phallodriline Inanidrilus exumae that differs markedly from the microbiome of all other 22 examined host species. Comparative 16S rRNA gene sequence analysis and fluorescence in situ hybridization revealed that I. exumae harboured co-occurring gamma-, alpha- and deltaproteobacterial symbionts, while all other known host species harbour gamma- and either alpha- or deltaproteobacterial symbionts...
January 12, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29326438/conditional-knockout-of-n-myc-and-stat-interactor-disrupts-normal-mammary-development-and-enhances-metastatic-ability-of-mammary-tumors
#5
Hawley C Pruitt, Brandon J Metge, Shannon E Weeks, Dongquan Chen, Shi Wei, Robert A Kesterson, Lalita A Shevde, Rajeev S Samant
The process of organ development requires a delicate balance between cellular plasticity and differentiation. This balance is disrupted in cancer initiation and progression. N-Myc and STAT interactor (NMI: human or Nmi: murine) has emerged as a relevant player in the etiology of breast cancer. However, a fundamental understanding of its relevance to normal mammary biology is lacking. To gain insight into its normal function in mammary gland, we generated a mammary-specific Nmi knockout mouse model. We observed that Nmi protein expression is induced in mammary epithelium at the onset of pregnancy, in luminal cells and persists throughout lactation...
January 12, 2018: Oncogene
https://www.readbyqxmd.com/read/29323728/3d-reconstruction-of-prostate-cancer-architecture-with-serial-immunohistochemical-sections-hallmarks-of-tumour-growth-tumour-compartmentalization-and-implications-for-grading-and-heterogeneity
#6
Yuri Tolkach, Stefan Thomann, Glen Kristiansen
BACKGROUND: Conventional morphology of the prostate cancer (PCA) considers only two-dimensional architecture of the tumour. Our aim was to examine the feasibility of 3D-reconstruction of tumour morphology based on multiple consecutive histological sections and to decipher relevant features of PCA architecture. METHODS: Seventy-five consecutive histological sections (5μm) of a typical prostate adenocarcinoma (Gleason-Score 3+4=7) were immunostained (Pan-Cytokeratin) and scanned for further 3D reconstructions with Fiji / ImageJ software...
January 11, 2018: Histopathology
https://www.readbyqxmd.com/read/29323291/neurexin-controls-plasticity-of-a-mature-sexually-dimorphic-neuron
#7
Michael P Hart, Oliver Hobert
During development and adulthood, brain plasticity is evident at several levels, from synaptic structure and function to the outgrowth of dendrites and axons. Whether and how sex impinges on neuronal plasticity is poorly understood. Here we show that the sex-shared GABA (γ-aminobutyric acid)-releasing DVB neuron in Caenorhabditis elegans displays experience-dependent and sexually dimorphic morphological plasticity, characterized by the stochastic and dynamic addition of multiple neurites in adult males. These added neurites enable synaptic rewiring of the DVB neuron and instruct a functional switch of the neuron that directly modifies a step of male mating behaviour...
January 10, 2018: Nature
https://www.readbyqxmd.com/read/29321524/phenotypic-divergence-despite-low-genetic-differentiation-in-house-sparrow-populations
#8
Shachar Ben Cohen, Roi Dor
Studying patterns of phenotypic variation among populations can shed light on the drivers of evolutionary processes. The house sparrow (Passer domesticus) is one of the world's most ubiquitous bird species, as well as a successful invader. We investigated phenotypic variation in house sparrow populations across a climatic gradient and in relation to a possible scenario of an invasion. We measured variation in morphological, coloration, and behavioral traits (exploratory behavior and neophobia) and compared it to the neutral genetic variation...
January 10, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29321296/substrate-growth-dynamics-and-biomineralization-of-an-ediacaran-encrusting-poriferan
#9
Rachel Wood, Amelia Penny
The ability to encrust in order to secure and maintain growth on a substrate is a key competitive innovation in benthic metazoans. Here we describe the substrate growth dynamics, mode of biomineralization and possible affinity of Namapoikia rietoogensis, a large (up to 1 m), robustly skeletal, and modular Ediacaran metazoan which encrusted the walls of synsedimentary fissures within microbial-metazoan reefs. Namapoikia formed laminar or domal morphologies with an internal structure of open tubules and transverse elements, and had a very plastic, non-deterministic growth form which could encrust both fully lithified surfaces as well as living microbial substrates, the latter via modified skeletal holdfasts...
January 10, 2018: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/29321175/upregulation-of-gh-but-not-igf1-in-the-hippocampus-of-the-lactating-dam-after-kainic-acid-injury
#10
Elvira C Arellanes-Licea, Jose Avila-Mendoza, Elizabeth C Ramirez-Martinez, Eugenia Ramos, Nancy Uribe-Gonzalez, Carlos Aramburo, Teresa Morales, Maricela Luna
Lactation embodies a natural model of morphological, neurochemical, and functional brain plasticity. In this reproductive stage, the hippocampus of the female is less sensitive to excitotoxins in contrast to nulliparity. Growth hormone (GH) and insulin-like growth factor 1 (IGF1) are known to be neuroprotective in several experimental models of brain lesion. Here, activation of the GH-IGF1 pituitary-brain axis following kainic acid (7.5 mg/kg ip KA) lesion was studied in lactating and nulliparous rats. Serum concentrations of GH and IGF1 were uncoupled in lactation...
January 10, 2018: Endocrine Connections
https://www.readbyqxmd.com/read/29321138/sensorimotor-functional-and-structural-networks-after-intracerebral-stem-cell-grafts-in-the-ischemic-mouse-brain
#11
Claudia Green, Anuka Minassian, Stefanie Vogel, Michael Diedenhofen, Andreas Beyrau, Dirk Wiedermann, Mathias Hoehn
Past investigations on stem cell mediated recovery after stroke have limited their focus on the extent and morphological development of the ischemic lesion itself over time or on the integration capacity of the stem cell graft ex vivo However, an assessment of the long-term functional and structural improvement in vivo is essential to reliably quantify the regenerative capacity of cell implantation after stroke.We induced ischemic stroke in nude mice and implanted human neural stem cells (H9 derived) into the ipsilateral cortex in the acute phase...
January 10, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29320725/keratin-based-bioplastic-film-from-chicken-feathers-and-its-characterization
#12
Navina Ramakrishnan, Swati Sharma, Arun Gupta, Basma Yahya Alashwal
Plastics have been one of the highly valued materials and it plays an significant role in human's life such as in food packaging and biomedical applications. Bioplastic materials can gradually work as a substitute for various materials based on fossil oil. The issue like sustainability and environmental challenges which occur due to manufacturing and disposal of synthetic plastics can be conquering by bio-based plastics. Feathers are among the most inexpensive abundant, and renewable protein sources. Feathers disposal to the landfills leads to environmental pollutions and it results into wastage of 90% of protein raw material...
January 7, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29317619/phf8-histone-demethylase-deficiency-causes-cognitive-impairments-through-the-mtor-pathway
#13
Xuemei Chen, Shuai Wang, Ying Zhou, Yanfei Han, Shengtian Li, Qing Xu, Longyong Xu, Ziqi Zhu, Youming Deng, Lu Yu, Lulu Song, Adele Pin Chen, Juan Song, Eiki Takahashi, Guang He, Lin He, Weidong Li, Charlie Degui Chen
Epigenomic abnormalities caused by genetic mutation in epigenetic regulators can result in neurodevelopmental disorders, deficiency in neural plasticity and mental retardation. As a histone demethylase, plant homeodomain finger protein 8 (Phf8) is a candidate gene for syndromal and non-specific forms of X-chromosome-linked intellectual disability (XLID). Here we report that Phf8 knockout mice displayed impaired learning and memory, and impaired hippocampal long-term potentiation (LTP) without gross morphological defects...
January 9, 2018: Nature Communications
https://www.readbyqxmd.com/read/29311688/innovative-linear-low-density-polyethylene-nanocomposite-films-reinforced-with-organophilic-layered-double-hydroxides-fabrication-morphology-and-enhanced-multifunctional-properties
#14
Jiazhuo Xie, Haijun Wang, Zhou Wang, Qinghua Zhao, Yuechao Yang, Geoffrey I N Waterhouse, Lei Hao, Zihao Xiao, Jing Xu
Herein, we reported the successful development of novel nanocomposite films based on linear low density polyethylene (LLDPE) with enhanced anti-drop, optical, mechanical, thermal and water vapor barrier properties by introducing organophilic layered double hydroxides (OLDHs) nanosheets. OLDHs loadings were varied from 0-6 wt.%. Structural analyses using the Fourier transform infrared spectrum (FT-IR), X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) indicated that the OLDHs nanosheets were homogeneously dispersed with an ordered alignment in the LLDPE matrix...
January 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29309043/alterations-of-synaptic-plasticity-in-aged-rats-evidence-of-functional-and-morphological-studies
#15
Qiong Xiang, Xian-Hui Li, Xin-Xing Fang, Jing Jia, Jie Ren, Yu-Chun Dong, Cheng Ou-Yang
BACKGROUND: The aging-related disease and associated neurodegenerative complications, such as cognitive impairment, has received increasing attention. OBJECTIVE: The aim of this study was to show changes in cognitive behavior and molecular related the synaptic plasticity in aged-induced cognitive deficits rats. METHODS: We used novel object recognition testing and morphological staining as well as western blot to detect changes in cognitive behavior and molecular related the synaptic plasticity...
December 22, 2017: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
https://www.readbyqxmd.com/read/29308257/the-genus-gennadas-benthesicymidae-decapoda-morphology-of-copulatory-characters-phylogeny-and-coevolution-of-genital-structures
#16
Alexander L Vereshchaka, Anastasia A Lunina, Jørgen Olesen
Species within Gennadas differ from each other largely only in male (petasma) and female (thelycum) copulatory characters, which were restudied in scanning electron microscopy and used as a basis for phylogenetic analyses. Twenty-six petasma characters and 49 thelycum characters were identified. All 16 recognized species of Gennadas and Aristaeomorpha foliacea (outgroup) were included as terminals. Four robust monophyletic clades were retrieved, described and diagnosed as new species groups. The thelycum characters had greater impact on tree topology and supported deeper nodes than did the petasma characters...
December 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29308223/effect-of-polyamide-6-on-the-morphology-and-electrical-conductivity-of-carbon-black-filled-polypropylene-composites
#17
Xuewei Zhang, Jiang Liu, Yi Wang, Wei Wu
Carbon black (CB)-filled polypropylene (PP) with surface resistivity between 106 and 109 Ω sq-1 is the ideal antistatic plastic material in the electronics and electric industry. However, a large amount of CB may have an adverse effect on the mechanical properties and processing performance of the material, thus an improved ternary system is developed. Blends of CB-filled PP and polyamide 6 (PA6) have been prepared by melt blending in order to obtain electrically conductive polymer composites with a low electrical percolation threshold based on the concept of double percolation...
December 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29303989/characterization-of-different-types-of-excitability-in-large-somatosensory-neurons-and-its-plastic-changes-in-pathological-pain-states
#18
Rou-Gang Xie, Wen-Guang Chu, San-Jue Hu, Ceng Luo
Sensory neuron types have been distinguished by distinct morphological and transcriptional characteristics. Excitability is the most fundamental functional feature of neurons. Mathematical models described by Hodgkin have revealed three types of neuronal excitability based on the relationship between firing frequency and applied current intensity. However, whether natural sensory neurons display different functional characteristics in terms of excitability and whether this excitability type undergoes plastic changes under pathological pain states have remained elusive...
January 5, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29303480/a-postsynaptic-pi3k-cii-dependent-signaling-controller-for-presynaptic-homeostatic-plasticity
#19
Anna G Hauswirth, Kevin J Ford, Tingting Wang, Richard D Fetter, Amy Tong, Graeme W Davis
Presynaptic homeostatic plasticity stabilizes information transfer at synaptic connections in organisms ranging from insect to human. By analogy with principles of engineering and control theory, the molecular implementation of PHP is thought to require postsynaptic signaling modules that encode homeostatic sensors, a set point, and a controller that regulates transsynaptic negative feedback. The molecular basis for these postsynaptic, homeostatic signaling elements remains unknown. Here, an electrophysiology-based screen of the Drosophila kinome and phosphatome defines a postsynaptic signaling platform that includes a required function for PI3K-cII, PI3K-cIII and the small GTPase Rab11 during the rapid and sustained expression of PHP...
January 5, 2018: ELife
https://www.readbyqxmd.com/read/29300872/a-generic-individual-based-model-to-simulate-morphogenesis-c-n-acquisition-and-population-dynamics-in-contrasting-forage-legumes
#20
Gaëtan Louarn, Lucas Faverjon
Background and Aims: Individual-based models (IBMs) are promising tools to disentangle plant interactions in multi-species grasslands and foster innovative species mixtures. This study describes an IBM dealing with the morphogenesis, growth and C-N acquisition of forage legumes that integrates plastic responses from functional-structural plant models. Methods: A generic model was developed to account for herbaceous legume species with contrasting above- and below-ground morphogenetic syndromes and to integrate the responses of plants to light, water and N...
December 29, 2017: Annals of Botany
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