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https://www.readbyqxmd.com/read/29331781/a-step-wise-self-assembly-approach-in-preparation-of-multi-responsive-poly-styrene-co-methyl-methacrylate-nanoparticles-containing-spiropyran
#1
Fahimeh Khakzad, Ali Reza Mahdavian, Hamid Salehi-Mobarakeh, Mohammad Hossain Sharifian
HYPOTHESIS: Surfactant-free emulsion polymerization has become favorable due to circumventing instability issues reasonably. Incorporation of an appropriate hydrophilic macroRAFT, could provide controlled in-situ self-assembly via copolymerization with hydrophobic monomers into polymer particles. So far, this approach has mostly been studied in dispersion systems and further studies are needed in emulsions. Beside the corresponding mechanistic studies, the prepared latex particles would potentially exhibit smart behaviors by choosing stimuli-responsive monomers...
January 4, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29327953/multicentric-cryptococcosis-in-a-congo-african-grey-parrot-psittacus-erithacus-erithacus
#2
Raina S K Schunk, Nicholas E Sitinas, Katherine E Quesenberry, Jessica L Grodio
An approximately 10-year-old, female Congo African grey parrot ( Psittacus erithacus erithacus) developed progressive, unilateral exophthalmos and buphthalmos. Survey radiographs revealed a large, coelomic, soft tissue mass, which was confirmed on computed tomography scan. Aspirates of both the contents of the buphthalmic globe and coelomic mass were consistent with Cryptococcus species. Initial results were later confirmed with serum antigen latex agglutination and polymerase chain reaction testing, and the organism was then identified as Cryptococcus neoformans with DNA sequencing...
December 2017: Journal of Avian Medicine and Surgery
https://www.readbyqxmd.com/read/29319055/composition-production-rate-and-management-of-dental-solid-waste-in-2017-in-birjand-iran
#3
Habibe Momeni, Seyyedeh Fatemeh Tabatabaei Fard, Aliye Arefinejad, Afsane Afzali, Farkhonde Talebi, Elham Rahmanpour Salmani
BACKGROUND: The presence of toxic and pathogenic agents in the dental waste products has made it to be classified as "hazardous waste." OBJECTIVE: To assess dental waste production rate and composition and approaches used to manage these waste products in 2017 in Birjand, Iran. METHODS: 48 dental clinics were evaluated in two months of 2017. Sampling was performed from each clinic 3 times a week. Samples were manually divided into 5 categories of chemical-pharmaceutical, infectious, semi-household, sharp and cutting materials, and toxic waste products, and weighed...
January 2018: International Journal of Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/29317173/identification-of-a-proteomic-biomarker-associated-with-invasive-st1-serotype-vi-group-b-streptococcus-by-maldi-tof-ms
#4
Hsiao-Chuan Lin, Jang-Jih Lu, Lee-Chung Lin, Cheng-Mao Ho, Kao-Pin Hwang, Yu-Ching Liu, Chao-Jung Chen
BACKGROUND: Group B Streptococcus (GBS) is an important invasive pathogen in neonates, pregnant women and the elderly. Serotype VI GBS, which has been rarely reported globally, has emerged as a significant pathogen in Asia. However, traditional serologic latex agglutination (LA) methods may fail to type isolates that lack of or low expression of CPS. METHODS: A total of 104 GBS strains were analyzed by MALDI-TOF MS. Multiplex PCR and multilocus sequence typing (MLST) were also performed to confirm their strains...
December 30, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/29314280/fabrication-of-silver-chloride-nanoparticles-using-a-plant-serine-protease-in-combination-with-photo-activation-and-investigation-of-their-biological-activities
#5
Jaruwan Siritapetawee, Wanwisa Limphirat, Nawarat Nantapong, Dujdow Songthamwat
Recently, the development of 'green' methods for fabrication of silver nanoparticles (Ag-NPs) has been emphasized, in view of their environmental safety, feasibility and low cost. In this study, a serine protease, EuP-82 from Euphorbia cf. lactea latex, was used to fabricate silver chloride nanoparticles (AgCl-NPs) in phosphate-buffered saline (pH 7.2), under the influence of visible light. The fabricated nanoparticles had a maximal surface plasmon resonance absorption peak at 435 nm. The size of the AgCl-NPs, estimated by scanning electron microscopy, was 57 ± 14...
January 3, 2018: Biotechnology and Applied Biochemistry
https://www.readbyqxmd.com/read/29309360/partitioning-an-artificial-anterior-chamber-with-a-latex-diaphragm-to-simulate-anterior-and-posterior-segment-pressure-dynamics-the-dmek-practice-stage-where-surgeons-can-rehearse-the-dmek-dance
#6
Christopher S Sáles, Michael D Straiko, Ana Alzaga Fernandez, Kelly Odell, Philip K Dye, Khoa D Tran
PURPOSE: To present a novel apparatus for simulating the anterior and posterior segment pressure dynamics involved in executing Descemet membrane endothelial keratoplasty (DMEK) surgery when using a chamber-shallowing technique. METHODS: An artificial anterior chamber (AAC), 18-mm trephine, latex glove, two 3-mL syringes, and one donor cornea comprising an intact corneoscleral cap from which a DMEK tissue was peeled and punched are required for the model. After making the corneal incisions with the corneoscleral cap mounted on the AAC in the usual fashion, the corneoscleral cap is remounted onto the dried AAC over an 18-mm latex diaphragm...
February 2018: Cornea
https://www.readbyqxmd.com/read/29306330/papain-like-cysteine-proteases-in-carica-papaya-lineage-specific-gene-duplication-and-expansion
#7
Juan Liu, Anupma Sharma, Marie Jamille Niewiara, Ratnesh Singh, Ray Ming, Qingyi Yu
BACKGROUND: Papain-like cysteine proteases (PLCPs), a large group of cysteine proteases structurally related to papain, play important roles in plant development, senescence, and defense responses. Papain, the first cysteine protease whose structure was determined by X-ray crystallography, plays a crucial role in protecting papaya from herbivorous insects. Except the four major PLCPs purified and characterized in papaya latex, the rest of the PLCPs in papaya genome are largely unknown...
January 6, 2018: BMC Genomics
https://www.readbyqxmd.com/read/29305745/evaluation-of-peptides-release-using-a-natural-rubber-latex-biomembrane-as-a-carrier
#8
M C R Miranda, F A Borges, N R Barros, N A Santos Filho, R J Mendonça, R D Herculano, E M Cilli
The biomembrane natural (NRL-Natural Rubber Latex), manipulated from the latex obtained from the rubber tree Hevea brasiliensis, has shown great potential for application in biomedicine and biomaterials. Reflecting the biocompatibility and low bounce rate of this material, NRL has been used as a physical barrier to infectious agents and for the controlled release of drugs and extracts. The aim of the present study was to evaluate the incorporation and release of peptides using a latex biomembrane carrier. After incorporation, the release of material from the membrane was observed using spectrophotometry...
January 5, 2018: Amino Acids
https://www.readbyqxmd.com/read/29305166/internalization-of-large-particles-by-turbot-scophthalmus-maximus-igm-b-cells-mainly-depends-on-macropinocytosis
#9
Yi-Qun Li, Li Sun, Jun Li
Increasing evidence has demonstrated support for the endocytic capacities of teleost B cells. In the present study, the ability of turbot IgM+ B cells to ingest microspheres of different sizes and the corresponding internalization pathways were investigated. The results showed that IgM+ B cells exhibited relatively high endocytic capacities for 0.5 μm and 1 μm latex beads, and that different mechanisms were employed for IgM+ and IgM- cells to uptake 0.5 μm and 1 μm beads. For 0.5 μm beads, IgM+ B cells apparently employed macropinocytosis-dependent endocytic pathway, whereas IgM- cells utilized a different process involving both clathrin- and caveolae-mediated pathways...
January 2, 2018: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/29300896/a-competitive-alphascreen-assay-for-detection-of-hyaluronan
#10
Xiayun Huang, Tannin A Schmidt, Claire Shortt, Shivani Arora, Akira Asari, Thorsten Kirsch, Mary K Cowman
A method for specific quantification of hyaluronan (HA) concentration using AlphaScreen® (Amplified Luminescent Proximity Homogeneous Assay) technology is described. Two types of hydrogel-coated and chromophore-loaded latex nanobeads are employed. The proximity of the beads in solution is detected by excitation of the donor bead leading to the production of singlet oxygen, and chemiluminescence from the acceptor bead upon exposure to singlet oxygen. In the HA assay, the donor bead is modified with streptavidin, and binds biotin-labeled HA...
December 29, 2017: Glycobiology
https://www.readbyqxmd.com/read/29295704/acyl-coa-binding-protein-family-members-in-laticifers-are-possibly-involved-in-lipid-and-latex-metabolism-of-hevea-brasiliensis-the-para-rubber-tree
#11
Zhiyi Nie, Yihang Wang, Chuntai Wu, Yu Li, Guijuan Kang, Huaide Qin, Rizhong Zeng
BACKGROUND: Acyl-CoA-binding proteins (ACBPs) are mainly involved in acyl-CoA ester binding and trafficking in eukaryotic cells, and their various functions have been characterized in model plants, such as Arabidopsis thaliana (A. thaliana), Oryza sativa (rice), and other plant species. In the present study, genome-wide mining and expression analysis of ACBP genes was performed on Hevea brasiliensis (the para rubber tree), the most important latex-producing crop in the world. RESULTS: Six members of the H...
January 2, 2018: BMC Genomics
https://www.readbyqxmd.com/read/29291076/synthesis-and-applications-of-mans-poly-mma-co-ba-nanocomposite-latex-by-miniemulsion-polymerization
#12
Sheng Gong, Huayao Chen, Xinhua Zhou, Sundaram Gunasekaran
We have synthesized core-shell structured 3-methacryloxypropyltrimethoxysilane (MPS) functionalized antimony-doped tin oxide nanoparticles (MANs)-poly(methyl methacrylate-co-butyl acrylate) (PMMA-co-BA, PMB) nanocomposite latex particles via miniemulsion polymerization method. Polymerizable anionic surfactant DNS-86 (allyloxy polyoxyethylene(10) nonyl ammonium sulfate) was first introduced to synthesize core-shell nanocomposite. The morphologies of synthesized MANs and MANs/PMB latex nanocomposite particles were studied with transmission electron microscopy, which revealed particles, on average 70 nm in size, with a core-shell structure...
November 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29289322/effects-of-structure-on-the-performance-of-latex-nanoparticles-as-a-pseudostationary-phase-in-electrokinetic-chromatography
#13
Jesse S Hyslop, Julie R McGettrick, Leah M G Hall, Hungngai Chuk, Christopher P Palmer
The fundamental relationships between the structure and chemistry of latex nanoparticles synthesized by reversible addition fragmentation chain transfer (RAFT) controlled living polymerization and their subsequent performance as pseudostationary phases (PSP) are reported in this paper. RAFT enables the rational optimization of latex nanoparticle pseudostationary phases and control of the behavior of the PSP. Nanoparticles comprised of amphiphilic diblock copolymers of 2-acrylamido-2-methylpropane sulfonic acid-derived ionic/hydrophilic blocks and butyl- ethyl- or methyl-acrylate-derived hydrophobic blocks were synthesized in two sizes...
February 13, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29284952/an-evaluation-of-the-effect-of-various-gloves-on-polymerization-inhibition-of-elastomeric-impression-materials-an-in-vitro-study
#14
Vinuta Hiremath, G Vinayakumar, Mallikarjuna Ragher, Sounyala Rayannavar, Mahantesh Bembalagi, B L Ashwini
Background: Latex protective barriers such as gloves and rubber dam material have been used widely in restorative procedures for crown and bridge. However, the chemical used during latex glove fabrication is thought to inhibit the polymerization of elastomeric impression materials used for impression making which has a detrimental effect on the dimensional accuracy and surface definition of resultant casts used for restorative procedures. The objectives of the study were to examine the surface of different elastomeric impressions on contact with various gloves...
November 2017: Journal of Pharmacy & Bioallied Sciences
https://www.readbyqxmd.com/read/29284419/serotype-distribution-and-antibiotic-resistance-of-streptococcus-pneumoniae-isolates-from-17-chinese-cities-from-2011-to-2016
#15
Chunjiang Zhao, Zongbo Li, Feifei Zhang, Xiaobing Zhang, Ping Ji, Ji Zeng, Bijie Hu, Zhidong Hu, Kang Liao, Hongli Sun, Rong Zhang, Bin Cao, Chao Zhuo, Wei Jia, Yaning Mei, Yunzhuo Chu, Xuesong Xu, Qing Yang, Yan Jin, Quan Fu, Xiuli Xu, Hongling Li, Lijun Wang, Yuxing Ni, Hongjie Liang, Hui Wang
BACKGROUND: Streptococcus pneumoniae, the leading pathogen of bacterial infections in infants and the elderly, is responsible for pneumococcal diseases with severe morbidity and mortality. Emergence of drug-resistant strains presented new challenges for treatment and prevention. Vaccination has proven to be an effective means of preventing pneumococcal infection worldwide. Detailed epidemiological information of antibiotic susceptibilities and serotype distribution will be of great help to the management of pneumococcal infections...
December 29, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29279622/evaluation-of-effect-of-different-disposable-infection-control-barriers-on-light-intensity-of-light-curing-unit-and-microhardness-of-composite-an-in-vitro-study
#16
Rajiv Tarachand Khode, Pratima Ramakrishna Shenoi, Rajesh R Kubde, Chetana S Makade, Kanchan D Wadekar, Priyanka Tarachand Khode
Aims: This study evaluated effect of infection control barriers on light intensity (LI) of light-curing unit (LCU) and microhardness of composite. Materials and Methods: Four different disposable barriers (n = 30) were tested against the control. LI for each barrier was measured with Lux meter. One hundred and fifty Teflon molds were equally divided into five groups of thirty each. Composite was filled in bulk in these molds and cured without and with barrier. Microhardness was evaluated on top and bottom surface of composite specimen with microhardness testing machine and hardness ratio (HR) was derived...
May 2017: Journal of Conservative Dentistry: JCD
https://www.readbyqxmd.com/read/29279616/cytocompatibility-of-a-self-adhesive-gutta-percha-root-filling-material
#17
Joyce Nascimento, Miriam Zaccaro Scelza, Gutemberg Gomes Alves, Adriana Linhares, Antonio Canabarro, Jose Mauro Granjeiro, Gustavo De-Deus
Context: A novel root-filling material based on the incorporation of ultrafine alkaline bioactive glass particles (bioactive gutta-percha, [BGP]) was developed to work without sealer. Aim: In the present study, the objective was to verify the in vitro biological response to this material by assessing its cytocompatibility. Materials and Methods: Prototypes of BGP were compared to conventional gutta-percha (GP), dense polystyrene beads as a negative control and fragments of latex as a positive control...
May 2017: Journal of Conservative Dentistry: JCD
https://www.readbyqxmd.com/read/29278624/allergic-reactions-and-anesthesia
#18
Danijela Glibo Bevanda, Marko Čačić, Slobodan Mihaljević, Mateo Bevanda, Ante Bogut, Maja Karin
The diagnosis of allergic reactions during anesthesia is difficult. For example, cardio-respiratory symptoms may be due to the accompanying pharmacological effects of anesthetics and poor interpretation of the reaction during anesthesia. It is important to distinguish whether a real allergic reaction has occurred. Accidents with anesthetics and muscle relaxants are observed more often than we expect. Proper anaphylaxis rarely occurs during anesthesia (1: 20000). Muscle relaxants are the most common causes, followed by latex, chlorhexidine, antibiotics and opioids...
December 2017: Psychiatria Danubina
https://www.readbyqxmd.com/read/29251570/stronger-at-depth-jamming-grippers-as-deep-sea-sampling-tools
#19
Stephen Licht, Everett Collins, Manuel Lopes Mendes, Christopher Baxter
In this work we experimentally demonstrate (a) that the holding strength of universal jamming grippers increases as a function of the jamming pressure to greater than three atmospheres, and (b) that jamming grippers can be operated in the deep sea in ambient pressures exceeding one hundred atmospheres, where such high jamming pressures can be readily achieved. Laboratory experiments in a pressurized, water-filled test cell are used to measure the holding force of a "universal" style jamming gripper as a function of the pressure difference between internal membrane pressure and ambient pressure...
December 2017: Soft Robotics
https://www.readbyqxmd.com/read/29249105/-self-reported-prevalence-of-latex-allergy-and-associated-factors-in-healthcare-workers
#20
Martín Bedolla-Barajas, María Luz Machuca-Rincón, Jaime Morales-Romero, Nicole Macriz-Romero, Ileana María Madrigal-Beas, Martín Robles-Figueroa, Tonatiuh Ramses Bedolla-Pulido, Tania González-Mendoza
BACKGROUND: In our country, the prevalence of latex allergy in health personnel has rarely been studied. OBJECTIVE: To determine the prevalence and associated factors to self-reported latex allergy in health care workers. METHODS: A cross-sectional study was conducted among 1,292 health care workers of a second level hospital. All workers were included and they were required to answer a structured questionnaire aimed at identifying latex allergy, atopic personal and family history, exposure to latex gloves and surgical background...
October 2017: Revista Alergia Mexico: Organo Oficial de la Sociedad Mexicana de Alergia e Inmunología, A.C
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