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Microscopy Research and Technique

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https://www.readbyqxmd.com/read/28322478/comparative-morphology-of-the-leaf-epidermis-in-lobelia-lobelioideae-from-china
#1
Chunjiao Li, Jingmei Lu, Yan Li, Junyi Zhu, Lifan Zhang
The leaf epidermal morphology of 38 samples, representing 22 Lobelia species from China, was studied using light microscopy and scanning electron microscopy. The stomata and other epidermal features were largely consistent within species, and therefore represented good characters for taxonomic purposes. Diagnostic characters of the leaf epidermis were used to differentiate species of Lobelia. The species pairs L. clavata and L. pyramidalis, L. alsinoides and L. terminalis, and L. davidii and L. erectiuscula, were differentiated using leaf epidermal characters...
March 21, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28304124/distinguishing-the-chinese-materia-medica-tiepishihu-from-similar-dendrobium-species-of-the-same-genus-using-histological-and-microscopic-method
#2
Kun-Zi Yu, Hua Yan, Hai-Chuan Tai, Nan-Ping Zhang, Xian-Long Cheng, Zeng-Xi Guo, Shuang-Cheng Ma, Feng Wei
The Chinese Materia Medica, Tiepishihu, used as a tonic for over one thousand years, is a well-known precious medicine in China. According to the Chinese Pharmacopoeia, its source is the species Dendrobium officinale Kimura et Migo, which is distinguished from other species in Dendrobium genus. However, these species from the same genus are similar with Tiepishihu and caused confusion in the market. To find a quick and simple method to distinguish Tiepishihu from other similar species, histologic and microscopic methods were combined together to investigate the transverse section of stem of Tiepishihu and other similar species...
March 17, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28295852/improved-capacity-to-evaluate-changes-in-intestinal-mucosal-surface-area-using-mathematical-modeling
#3
Chasen J Greig, Robert A Cowles
Quantification of intestinal mucosal growth typically relies on morphometric parameters, commonly villus height, as a surrogate for presumed changes in mucosal surface area (MSA). We hypothesized that using mathematical modeling based on multiple unique measurements would improve discrimination of the effects of interventions on MSA compared to standard measures. To determine the ability of mathematical modeling to resolve differences in MSA, a mouse model with enhanced serotonin (5HT) signaling known to stimulate mucosal growth was used...
March 13, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28294460/retinal-imaging-analysis-based-on-vessel-detection
#4
Arshad Jamal, Mohammed Hazim Alkawaz, Amjad Rehman, Tanzila Saba
With an increase in the advancement of digital imaging and computing power, computationally intelligent technologies are in high demand to be used in ophthalmology cure and treatment. In current research, Retina Image Analysis (RIA) is developed for optometrist at Eye Care Center in Management and Science University. This research aims to analyze the retina through vessel detection. The RIA assists in the analysis of the retinal images and specialists are served with various options like saving, processing and analyzing retinal images through its advanced interface layout...
March 13, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28295892/macroanatomic-light-and-electron-microscopic-examination-of-pecten-oculi-in-the-seagull-larus-canus
#5
Nazan Gezer Ince, Burcu Onuk, Yonca Betil Kabak, Aydin Alan, Murat Kabak
The present study was conducted to determine macroanatomic characteristic as well as light and electron microscopic examination (SEM) of pecten oculi and totally 20 bulbus oculi belonging to 10 seagulls (Larus canus) were used. Pecten oculi formations consisted of 18 to 21 pleats and their shape looked like a snail. Apical length of the pleats forming pecten oculi were averagely measured as 5.77 ± 0.56 mm, retina-dependent base length was 9.01 ± 1.35 mm and height was measured as 6.4 ± 0.62 mm...
March 11, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28295841/morphogenesis-and-developmental-ultrastructure-of-nicotiana-tabacum-short-glandular-trichomes
#6
Branka Uzelac, Dušica Janošević, Dragana Stojičić, Snežana Budimir
The anatomy and ultrastructure of the short glandular trichomes occurring on young expanding leaves of Nicotiana tabacum were investigated using light and transmission electron microscopy. The objective of the present research was to characterize the cellular changes that occur during morphogenesis of short glandular trichomes, from initiation to senescence. Ultrastructural analysis of their secretory cells revealed characteristics common to gland cells: numerous mitochondria in highly organized cytoplasm, large nuclei, and an elaborate network of endoplasmic reticulum...
March 11, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28271628/zinc-oxide-3d-microstructures-as-an-antimicrobial-filler-content-for-composite-resins
#7
Hércules Bezerra Dias, Maria Inês Basso Bernardi, Matheus Aparecido Dos Santos Ramos, Tamara Carolina Trevisan, Taís Maria Bauab, Antônio Carlos Hernandes, Alessandra Nara de Souza Rastelli
The aim of this study was to evaluate the antibacterial activity of a composite resin modified by 3D zinc oxide (ZnO) microstructures and to verify possible alterations on its mechanical properties. ZnO was synthesized by hydrothermal approach and characterized by X-ray diffraction (XRD), surface area by Brunauer, Emmett and Teller (BET), Fourier transform infrared spectroscopy (FTIR) and Field emission scanning electron microscopy (FESEM). The minimum inhibitory concentrations of ZnO against Streptococcus mutans, Escherichia coli, Staphylococcus aureus, and Candida albicans were determinated...
March 8, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28271594/sealing-ability-and-adaptation-of-root-end-filling-materials-in-cavities-prepared-with-different-techniques
#8
Selen Küçükkaya Eren, Mehmet Ömer Görduysus, Cem Şahin
The aim of this study was to evaluate the sealing ability and marginal adaptation of calcium silicate-based cements (CSCs) in root-end cavities prepared by ultrasonic and laser tips. A total of 72 extracted human maxillary incisor teeth were randomly divided as 60 teeth in experimental groups and 6 teeth each for positive and negative control groups. Specimens in experimental groups were obturated, their root-end resections were performed and randomly divided into six groups (n = 10) as follows: G1: Ultrasonic retrotip + MTA, G2: Ultrasonic retrotip + Calcium Enriched Mixture (CEM), G3: Ultrasonic retrotip + Biodentine, G4: Er:YAG laser tip + MTA, G5: Er:YAG laser tip + CEM, G6: Er:YAG laser tip + Biodentine...
March 8, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28251725/effects-of-different-desensitizers-and-lasers-on-dentine-tubules-an-in-vitro-analysis
#9
Elif Öncü, Said Karabekiroğlu, Nimet Ünlü
BACKGROUND: Dentin hypersensitivity is an important clinical problem affecting a large percentage of the population, and various therapies have been suggested for its treatment-among them desensitizing agents and lasers. The aim of this study was to evaluate the in vitro effects of different in-office desensitizing agents and different type lasers, alone or in combination, on human dentinal tubules. MATERIALS AND METHODS: Eighty-four dentinal specimens obtained from freshly extracted impacted third molars were included and subsequently divided into seven groups: Group 1 (Control), Group 2 (Gluma desensitizer), Group 3 (Teethmate desensitizer), Group 4 (Nd:YAG laser), Group 5 (Er:YAG laser), Group 6 (Gluma desensitizer + Er:YAG laser), and Group 7 (Teethmate desensitizer + Er:YAG laser)...
March 2, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28247972/clinical-relevance-of-hypercoagulability-and-possible-hypofibrinolysis-associated-with-estrone-and-estriol
#10
Albe C Swanepoel, Priyaa Naidoo, Vance G Nielsen, Etheresia Pretorius
Estrone (E1 ) and Estriol (E3 ) are endogenous female hormones, present in increased concentrations during female specific physiological processes (menopause and pregnancy respectively) that are associated with increased venous thrombotic risk. These hormones are also used as hormone therapies that are also associated with increased thromboembolism risk. Viscoelastic analysis revealed no significant difference to clot formation after hormone addition, however morphological analysis showed that the addition of both E1 and E3 result in fibrin clots composed of thinner fibrin fibers arranged in dense matted networks...
March 1, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28248446/differences-in-the-nanoscale-electrical-properties-of-gan-films-grown-on-sapphire-and-zno-substrates-by-molecular-beam-epitaxy
#11
Sy-Hann Chen, Chiung-Wu Su, Li-Hsin Chang, Tzung-Han Tsai
Gallium nitride (GaN) films were grown on sapphire and zinc oxide (ZnO) single crystal substrates using plasma-assisted molecular beam epitaxy. As ZnO for GaN have a better lattice match, the coverage ratio of the GaN (002) plane on the ZnO substrate was significantly higher by about 45%. According to conducting atomic force microscopy and scanning surface potential microscopy measurements, the surface of GaN films grown on the ZnO substrate had two excellent physical characteristics: (a) an 18% reduction of the high contact current region, and (b) a highly uniform work function distribution...
February 28, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28245082/a-comparative-study-of-mud-like-and-coralliform-calcium-carbonate-gallbladder-stones
#12
Rui-Hong Ma, Xiao-Bing Luo, Xiao-Feng Wang, Tie Qiao, Hai-Yi Huang, Hai-Qiang Zhong
To gain insight to underlying mechanism of the formation of calcium carbonate (CaCO3 ) gallbladder stones, we did comparative study of stones with mud appearance and those with coralliform appearance. A total of 93 gallbladder stones with mud appearance and 50 stones with coralliform appearance were analyzed. The appearance, color, texture, and the detection of Clonorchis sinensis eggs by microscopic examination were compared between the two groups. Then, the material compositions of stones were analyzed using Fourier Transform Infrared spectroscopy and the spectrogram characteristics were compared...
February 28, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28245078/identification-of-huoshan-shihu-fengdou-comparative-authentication-of-the-daodi-herb-dendrobium-huoshanense-and-its-related-species-by-macroscopic-and-microscopic-features
#13
Yujiao Zhao, Bangxing Han, Huasheng Peng, Xiao Wang, Shanshan Chu, Jun Dai, Daiyin Peng
"Huoshan shihu," derived from Dendrobium huoshanense, is a well-known, valuable, and rare Daodi herb. Because of its higher price and scarce resources, its related species D. officinale and D. moniliforme are usually presented as "Huoshan shihu" for sale. Fengdou, the processed form of D. huoshanense, its identification is particularly important. To effectively identify Fengdou of D. huoshanense and protect the Daodi herb, the morphological and microscopic characteristics of the stems of three Dendrobium species were examined...
February 28, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28245072/morphology-and-nanoindentation-properties-of-mouthparts-in-cyrtotrachelus-longimanus-coleoptera-curculionidae
#14
Longhai Li, Ce Guo, Shun Xu, Xin Li, Cheng Han
Microstructure and nanoindentation properties of the mouthparts for the skillful driller Cyrtotrachelus longimanus are presented. The composition and morphological examinations are made using light, fluorescent, scanning electron microscopy, and Energy Disperse Spectroscopy, respectively. Nanoindentation was carried out to measure the elastic modulus and the hardness of mouthparts. The hardness and modulus for "dry" samples is 0.202 ± 0.065 and 8.604 ± 0.838 GPa, respectively, and the values of "fresh" ones is 0...
February 28, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28213907/optimizing-the-analysis-of-dental-enamel-microstructure-in-intact-teeth
#15
Zulieth López Arrieta, Sergio Roberto Peres Line
In most mammalian species enamel prisms are regularly arranged in layers of alternating directions forming an angle of approximately 90°. These successive layers of prisms are known as Hunter-Schreger bands (HSBs). The analysis of HSBs may provide valuable information regarding the species life history, taxon and personal identification, with evident applicability in physical anthropology and forensics. Obtaining good quality digital images of HSBs in intact specimens is not always a feasible task. The major problems are the low contrast of images; the reflection of incident light, which may create areas of intense shine in digital images; and the abrupt decrease in the degree of illumination that occurs after light crosses the vertical cracks, frequently present in enamel...
February 17, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28194836/quantitative-characterization-of-the-carbon-carbon-composites-components-based-on-video-of-polarized-light-microscope
#16
Yixian Li, Lehua Qi, Yongshan Song, Xujiang Chao
The components of carbon/carbon (C/C) composites have significant influence on the thermal and mechanical properties, so a quantitative characterization of component is necessary to study the microstructure of C/C composites, and further to improve the macroscopic properties of C/C composites. Considering the extinction crosses of the pyrocarbon matrix have significant moving features, the polarized light microscope (PLM) video is used to characterize C/C composites quantitatively because it contains sufficiently dynamic and structure information...
February 13, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28190294/evaluation-of-smear-layer-removal-and-marginal-adaptation-of-root-canal-sealer-after-final-irrigation-using-ethylenediaminetetraacetic-peracetic-and-etidronic-acids-with-different-concentrations
#17
Özgür İlke Ulusoy, Salev Zeyrek, Bülent Çelik
The purpose of this study was to investigate the effects of different irrigation solutions on the smear layer removal and marginal adaptation of a resin-based sealer to root canal dentine. A total of 152 instrumented roots were irrigated with the following irrigants: 9,18% etidronic acid (HEBP), 0.5, 1,2% peracetic acid (PAA), 17% ethylenediaminetetraacetic acid (EDTA), saline. The amount of smear layer was evaluated using scanning electron microscope (SEM) in seventy root samples. Eighty-two roots were filled with AH Plus and gutta-percha...
February 12, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28181372/resolution-and-super-resolution
#18
REVIEW
Colin J R Sheppard
Many papers have claimed the attainment of super-resolution, i.e. resolution beyond that achieved classically, by measurement of the profile of a feature in the image. We argue that measurement of the contrast of the image of a dark bar on a bright background does not give a measure of resolution, but of detection sensitivity. The width of a bar that gives an intensity at the center of the bar of 0.735 that in the bright region (the same ratio as in the Rayleigh resolution criterion) is λ/(13.9×numerical aperture) for the coherent case with central illumination...
February 9, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28181353/antimicrobial-effect-frictional-resistance-and-surface-roughness-of-stainless-steel-orthodontic-brackets-coated-with-nanofilms-of-silver-and-titanium-oxide-a-preliminary-study
#19
Tania Ghasemi, Valiollah Arash, Vahid Rakhshan, Mahmoud Rabiee, Ramezan Rajab Nia, Fatemeh Majd Zadeh, Amir Hossein Pour Zare, Mana Shamsedin, Samira Kavoli
Nano-silver and nano-titanium oxide films can be coated over brackets in order to reduce bacterial aggregation and friction. However, their antimicrobial efficacy, surface roughness, and frictional resistance are not assessed before. Fifty-five stainless-steel brackets were divided into 5 groups of 11 brackets each: uncoated brackets, brackets coated with 60 µm silver, 100 µm silver, 60 µm titanium, and 100 µm titanium. Coating was performed using physical vapor deposition method. For friction test, three brackets from each group were randomly selected and tested...
February 9, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28181329/silk-based-biomaterials
#20
EDITORIAL
Mingying Yang
No abstract text is available yet for this article.
February 9, 2017: Microscopy Research and Technique
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