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https://www.readbyqxmd.com/read/28818918/revisit-nih-biosafety-guidelines
#1
EDITORIAL
Kenneth A Oye, Maureen O'Leary, Margaret F Riley
No abstract text is available yet for this article.
August 18, 2017: Science
https://www.readbyqxmd.com/read/28817345/reverse-transcription-quantitative-polymerase-chain-reaction-for-detection-of-and-differentiation-between-rna-and-dna-of-hiv-1-based-lentiviral-vectors
#2
Melanie Pavlovic, Nina Koehler, Martina Anton, Anna Dinkelmeier, Maren Haase, Thorsten Stellberger, Ulrich Busch, Armin E Baiker
The purpose of the described method is the detection of and differentiation between RNA and DNA of human immunodeficiency virus (HIV)-derived lentiviral vectors (LV) in cell culture supernatants and swab samples. For the analytical surveillance of genetic engineering, operations methods for the detection of the HIV-1-based LV generations are required. Furthermore, for research issues, it is important to prove the absence of LV particles for downgrading experimental settings in terms of the biosafety level. Here, a quantitative polymerase chain reaction method targeting the long terminal repeat U5 subunit and the start sequence of the packaging signal ψ is described...
August 2017: Human Gene Therapy Methods
https://www.readbyqxmd.com/read/28815231/fluorescence-activated-cell-sorting-via-a-focused-traveling-surface-acoustic-beam
#3
Zhichao Ma, Yinning Zhou, David J Collins, Ye Ai
Fluorescence activated cell sorting (FACS) has become an essential technique widely exploited in biological studies and clinical applications. However, current FACS systems are quite complex, expensive, bulky, and pose potential sample contamination and biosafety issues due to the generation of aerosols in an open environment. Microfluidic technology capable of precise cell manipulation has great potential to reinvent and miniaturize conventional FACS systems. In this work, we demonstrate a benchtop scale FACS system that makes use of a highly focused traveling surface acoustic wave beam to sort out micron-sized particles and biological cells upon fluorescence interrogation at ∼kHz rates...
August 17, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28813510/construction-of-novel-pjrd215-derived-plasmids-using-chloramphenicol-acetyltransferase-cat-gene-as-a-selection-marker-for-acidithiobacillus-caldus
#4
Rui Wang, Chunmao Lin, Jianqiang Lin, Xin Pang, Xiangmei Liu, Chengjia Zhang, Jianqun Lin, Linxu Chen
BACKGROUND: Acidithiobacillus caldus, a Gram-negative, chemolithotrophic sulfur-oxidizing bacterium, is widely applied in bioleaching. The absence of an ideal selection marker has become a major obstacle to achieve high efficiency of the gene transfer system for A. caldus. Plasmid pJRD215, widely used in Acidithiobacillus spp., has severe drawbacks in molecular manipulations and potential biosafety issues due to its mobility. Therefore, finding a new selection marker and constructing new plasmids have become an urgent and fundamental work for A...
2017: PloS One
https://www.readbyqxmd.com/read/28807685/an-rna-polymerase-ii-driven-ebola-virus-minigenome-system-as-an-advanced-tool-for-antiviral-drug-screening
#5
Emily V Nelson, Jennifer R Pacheco, Adam Hume, Tessa N Cressey, Laure R Deflubé, John B Ruedas, John H Connor, Hideki Ebihara, Elke Mühlberger
Ebola virus (EBOV) causes a severe disease in humans with the potential for significant international public health consequences. Currently, treatments are limited to experimental vaccines and therapeutics. Therefore, research into prophylaxis and antiviral strategies to combat EBOV infections is of utmost importance. The requirement for high containment laboratories to study EBOV infection is a limiting factor for conducting EBOV research. To overcome this issue, minigenome systems have been used as valuable tools to study EBOV replication and transcription mechanisms and to screen for antiviral compounds at biosafety level 2...
August 11, 2017: Antiviral Research
https://www.readbyqxmd.com/read/28805830/in-vitro-and-in-vivo-analysis-of-visible-light-crosslinkable-gelatin-methacryloyl-gelma-hydrogels
#6
Iman Noshadi, Seonki Hong, Kelly E Sullivan, Ehsan Shirzaei Sani, Roberto Portillo-Lara, Ali Tamayol, Su Ryon Shin, Albert E Gao, Whitney L Stoppel, Lauren D Black Iii, Ali Khademhosseini, Nasim Annabi
Photocrosslinkable materials have been frequently used for constructing soft and biomimetic hydrogels for tissue engineering. Although ultraviolet (UV) light is commonly used for photocrosslinking such materials, its use has been associated with several biosafety concerns such as DNA damage, accelerated aging of tissues, and cancer. Here we report an injectable visible light crosslinked gelatin-based hydrogel for myocardium regeneration. Mechanical characterization revealed that the compressive moduli of the engineered hydrogels could be tuned in the range of 5-56 kPa by changing the concentrations of the initiator, co-initiator and co-monomer in the precursor formulation...
August 14, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28805472/network-experiences-from-a-cross-sector-biosafety-level-3-laboratory-collaboration-a-swedish-forum-for-biopreparedness-diagnostics
#7
Johanna Thelaus, Anna Lindberg, Susanne Thisted Lambertz, Mona Byström, Mats Forsman, Hans Lindmark, Rickard Knutsson, Viveca Båverud, Andreas Bråve, Pontus Jureen, Annelie Lundin Zumpe, Öjar Melefors
The Swedish Forum for Biopreparedness Diagnostics (FBD) is a network that fosters collaboration among the 4 agencies with responsibility for the laboratory diagnostics of high-consequence pathogens, covering animal health and feed safety, food safety, public health and biodefense, and security. The aim of the network is to strengthen capabilities and capacities for diagnostics at the national biosafety level-3 (BSL-3) laboratories to improve Sweden's biopreparedness, in line with recommendations from the EU and WHO...
August 14, 2017: Health Security
https://www.readbyqxmd.com/read/28801267/primum-non-nocere-the-effects-of-sodium-hypochlorite-on-dentin-as-used-in-endodontics
#8
Li-Sha Gu, Xue-Qing Huang, Brandon Griffin, Brian R Bergeron, David H Pashley, Li-Na Niu, Franklin R Tay
The medical literature is replete with the maxim 'primum non nocere', cautioning health care providers to avoid doing any harm to human subjects in their delivery of medical care. Sodium hypochlorite (NaOCl) is a well-established irrigant for root canal treatment because of its antimicrobial and organic tissue remnant dissolution capability. However, little is known about the deleterious effect of this strong oxidizing agent on the integrity of human mineralized dentin. Iatrogenically-induced loss of dentin integrity may precipitate post-treatment root fracture and has potential medico-legal complications...
August 8, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28797730/an-lasv-gpc-pseudotyped-virus-based-reporter-system-enables-evaluation-of-vaccines-in-mice-under-non-bsl-4-conditions
#9
Qianqian Li, Qiang Liu, Weijin Huang, Jiajing Wu, Jianhui Nie, Meng Wang, Chenyan Zhao, Li Zhang, Youchun Wang
Lassa virus (LASV) causes a severe hemorrhagic fever endemic throughout western Africa. Because of the ability to cause lethal disease in humans, limited treatment options, and potential as a bioweapon, the need for vaccines to prevent LASV epidemic is urgent. However, LASV vaccine development has been hindered by the lack of appropriate small animal models for efficacy evaluation independent of biosafety level four (BSL-4) facilities. Here we generated an LASV-glycoprotein precursor (GPC)-pseudotyped Human immunodeficiency virus containing firefly luciferase (Fluc) reporter gene as surrogate to develop a bioluminescent-imaging-based BALB/c mouse model for one-round infection under non-BSL-4 conditions, in which the bioluminescent intensity of Fluc was utilized as endpoint when evaluating vaccine efficacy...
August 7, 2017: Vaccine
https://www.readbyqxmd.com/read/28795530/construction-of-silica-based-micro-nanoplatforms-for-ultrasound-theranostic-biomedicine
#10
REVIEW
Yang Zhou, Xiaoxia Han, Xiangxiang Jing, Yu Chen
Ultrasound (US)-based biomedicine has been extensively explored for its applications in both diagnostic imaging and disease therapy. The fast development of theranostic nanomedicine significantly promotes the development of US-based biomedicine. This progress report summarizes and discusses the recent developments of rational design and fabrication of silica-based micro/nanoparticles for versatile US-based biomedical applications. The synthetic strategies and surface-engineering approaches of silica-based micro/nanoparticles are initially discussed, followed by detailed introduction on their US-based theranostic applications...
August 10, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28791039/impact-of-transgenic-brassica-napus-harboring-the-antifungal-synthetic-chitinase-nic-gene-on-rhizosphere-microbial-diversity-and-enzyme-activities
#11
Mohammad S Khan, Syed U Sadat, Asad Jan, Iqbal Munir
Transgenic Brassica napus harboring the synthetic chitinase (NiC) gene exhibits broad-spectrum antifungal resistance. As the rhizosphere microorganisms play an important role in element cycling and nutrient transformation, therefore, biosafety assessment of NiC containing transgenic plants on soil ecosystem is a regulatory requirement. The current study is designed to evaluate the impact of NiC gene on the rhizosphere enzyme activities and microbial community structure. The transgenic lines with the synthetic chitinase gene (NiC) showed resistance to Alternaria brassicicola, a common disease causing fungal pathogen...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28783349/orthogonal-ribosome-bio-firewall
#12
Bin Jia, Hao Qi, Bing-Zhi Li, Shuo Pan, Duo Liu, Hong Liu, Yizhi Cai, Ying-Jin Yuan
Biocontainment systems are crucial for preventing genetically modified organisms from escaping into natural ecosystems. Here, we describe the orthogonal ribosome bio-firewall, which consists of an activation circuit and a degradation circuit. The activation circuit is a genetic AND gate based on activation of the encrypted pathway by the orthogonal ribosome in response to specific environmental signals. The degradation circuit is a genetic NOT gate with an output of I-SceI homing endonuclease, which conditionally degrades the orthogonal ribosome genes...
August 7, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28776530/rapid-laboratory-diagnosis-of-pulmonary-tuberculosis
#13
Prasanna Bhirud, Ameeta Joshi, Nilma Hirani, Abhay Chowdhary
BACKGROUND: Tuberculosis (TB) ranks as the second leading cause of death from an infectious disease worldwide. Early diagnosis of Mycobacterium tuberculosis in clinical samples becomes important in the control of TB both for the treatment of patients and for curbing of disease transmission to the others in the community. The study objective was to perform Ziehl-Neelsen (ZN) staining, fluorochrome staining, line probe assay (LPA), and loop-mediated isothermal amplification (LAMP) assay for rapid detection of pulmonary TB (PTB) and to compare the results of LPA and LAMP in terms of sensitivity, specificity, and turnaround time...
July 2017: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28771335/bioaccumulation-and-toxicity-of-13-c-skeleton-labeled-graphene-oxide-in-wheat
#14
Lingyun Chen, Chenglong Wang, Hongliang Li, Xiulong Qu, Shengtao Yang, Xue-Ling Chang
Graphene nanomaterials have many diverse applications, but are considered to be emerging environmental pollutants. Thus, their potential environmental risks and biosafety are receiving increased attention. Bioaccumulation and toxicity evaluations in plants are essential for biosafety assessment. In this study, (13)C-stable isotope labeling of the carbon skeleton of graphene oxide (GO) was applied to investigate the bioaccumulation and toxicity of GO in wheat. Bioaccumulation of GO was accurately quantified according to the (13)C/(12)C ratio...
August 3, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28771313/a-microfluidic-biodisplay
#15
Francesca Volpetti, Ekaterina Petrova, Sebastian J Maerkl
Synthetically engineered cells are powerful and potentially useful biosensors, but it remains problematic to deploy such systems due to practical difficulties and biosafety concerns. To overcome these hurdles, we developed a microfluidic device that serves as an interface between an engineered cellular system, environment, and user. We created a biodisplay consisting of 768 individually programmable biopixels and demonstrated that it can perform multiplexed, continuous sampling. The biodisplay detected 10 µg/l sodium-arsenite in tap water using a research grade fluorescent microscope, and reported arsenic contamination down to 20 µg/l with an easy to interpret "skull and crossbones" symbol detectable with a low-cost USB microscope or by eye...
August 3, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28770337/overexpression-of-biologically-safe-rorippa-indica-defensin-enhances-aphid-tolerance-in-brassica-juncea
#16
Poulami Sarkar, Kuladip Jana, Samir Ranjan Sikdar
Transgenic mustard plants ( Brassica juncea ) expressing non-allergenic and biologically safe RiD peptide show higher tolerance against Lipaphis erysimi. Rorippa indica defensin (RiD) has previously been reported as a novel insecticidal protein derived from a wild crucifer Rorippa indica. RiD was found to have an effective insecticidal property against mustard aphid, Lipaphis erysimi. In the present study, RiD was highly upregulated in R. indica during aphid infestation initiating a defense system mediated by jasmonic acid (JA), but not by salicylic acid (SA)/abscisic acid (ABA)...
August 2, 2017: Planta
https://www.readbyqxmd.com/read/28765600/combinatorial-metabolic-engineering-of-pseudomonas-putida-kt2440-for-efficient-mineralization-of-1-2-3-trichloropropane
#17
Ting Gong, Xiaoqing Xu, You Che, Ruihua Liu, Weixia Gao, Fengjie Zhao, Huilei Yu, Jingnan Liang, Ping Xu, Cunjiang Song, Chao Yang
An industrial waste, 1,2,3-trichloropropane (TCP), is toxic and extremely recalcitrant to biodegradation. To date, no natural TCP degraders able to mineralize TCP aerobically have been isolated. In this work, we engineered a biosafety Pseudomonas putida strain KT2440 for aerobic mineralization of TCP by implantation of a synthetic biodegradation pathway into the chromosome and further improved TCP mineralization using combinatorial engineering strategies. Initially, a synthetic pathway composed of haloalkane dehalogenase, haloalcohol dehalogenase and epoxide hydrolase was functionally assembled for the conversion of TCP into glycerol in P...
August 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28758332/a-biosafety-level-2-virology-lab-for-biotechnology-undergraduates
#18
Sigal Matza-Porges, Dafna Nathan
Medical, industrial, and basic research relies heavily on the use of viruses and vectors. Therefore, it is important that bioscience undergraduates learn the practicalities of handling viruses. Teaching practical virology in a student laboratory setup presents safety challenges, however. The aim of this article is to describe the design and implementation of a virology laboratory, with emphasis on student safety, for biotechnology undergraduates. Cell culture techniques, animal virus infection, quantification, and identification are taught at a biosafety level 2 for a diverse group of undergraduates ranging from 20 to 50 students per group...
July 30, 2017: Biochemistry and Molecular Biology Education
https://www.readbyqxmd.com/read/28751059/schmallenberg-virus-an-emerging-viral-pathogen-of-cattle-and-sheep-and-a-potential-contaminant-of-raw-materials-is-detectable-by-classical-in-vitro-adventitious-virus-assays
#19
Anne Ilchmann, Alison A Armstrong, Reginald F Clayton
Emerging viruses, as potential contaminants of raw materials used in the manufacture of biologicals represent a challenge in the safety testing of biopharmaceutical products intended for human or veterinary use. Here, we report the challenge of an in vitro adventitious virus platform used in safety testing of biologicals, where a broad panel of detector cell lines was challenged to provide evidence that Schmallenberg virus is detectable by a classical reporting endpoint of cytopathic effect with Vero, BHK-21 and CHO-K1 detector cells, within typical in vitro assay timescales...
July 24, 2017: Biologicals: Journal of the International Association of Biological Standardization
https://www.readbyqxmd.com/read/28750596/-rt-qpcr-for-detection-of-and-differentiation-between-rna-and-dna-of-hiv-1-based-lentiviral-vectors
#20
Melanie Pavlovic, Nina Koehler, Martina Anton, Anna Dinkelmeier, Maren Haase, Thorsten Stellberger, Ulrich Busch, Armin E Baiker
The purpose of the described method is the detection of and differentiation between RNA and DNA of HIV-derived lentiviral vectors (LV) in cell culture supernatants and swab samples. For the analytical surveillance of genetic engineering operations methods for the detection of the HIV-1 based LV generations are required. Furthermore, for research issues, it is important to prove the absence of LV particles for downgrading experimental settings in terms of the biosafety level. Here a qPCR method targeting the LTR U5 subunit and the start sequence of the packaging signal ψ is described...
July 27, 2017: Human Gene Therapy Methods
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