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https://www.readbyqxmd.com/read/28335571/3-substituted-n-benzylpyrazine-2-carboxamide-derivatives-synthesis-antimycobacterial-and-antibacterial-evaluation
#1
Lucia Semelková, Ondřej Janďourek, Klára Konečná, Pavla Paterová, Lucie Navrátilová, František Trejtnar, Vladimír Kubíček, Jiří Kuneš, Martin Doležal, Jan Zitko
A series of substituted N-benzyl-3-chloropyrazine-2-carboxamides were prepared as positional isomers of 5-chloro and 6-chloro derivatives, prepared previously. During the aminolysis of the acyl chloride, the simultaneous substitution of chlorine with benzylamino moiety gave rise to N-benzyl-3-(benzylamino)pyrazine-2-carboxamides as side products, in some cases. Although not initially planned, the reaction conditions were modified to populate this double substituted series. The final compounds were tested against four mycobacterial strains...
March 21, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28335565/an-eco-safety-assessment-of-glyoxal-containing-cellulose-ether-on-freeze-dried-microbial-strain-cyanobacteria-daphnia-and-zebrafish
#2
Chang-Beom Park, Min Ju Song, Nak Woon Choi, Sunghoon Kim, Hyun Pyo Jeon, Sanghun Kim, Youngjun Kim
The objective of this study was to investigate the aquatic-toxic effects of glyoxal-containing cellulose ether with four different glyoxal concentrations (0%, 1.4%, 2.3%, and 6.3%) in response to global chemical regulations, e.g., European Union Classification, Labeling and Packaging (EU CLP). Toxicity tests of glyoxal-containing cellulose ether on 11 different microbial strains, Microcystis aeruginosa, Daphnia magna, and zebrafish embryos were designed as an initial stage of toxicity screening and performed in accordance with standardized toxicity test guidelines...
March 21, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28335476/inhibition-of-neoplastic-transformation-and-chemically-induced-skin-hyperplasia-in-mice-by-traditional-chinese-medicinal-formula-si-wu-tang
#3
Mandy M Liu, Kevin M Huang, Steven Yeung, Andy Chang, Suhui Zhang, Nan Mei, Cyrus Parsa, Robert Orlando, Ying Huang
Exploring traditional medicines may lead to the development of low-cost and non-toxic cancer preventive agents. Si-Wu-Tang (SWT), comprising the combination of four herbs, Rehmanniae, Angelica, Chuanxiong, and Paeoniae, is one of the most popular traditional Chinese medicines for women's diseases. In our previous studies, the antioxidant Nrf2 pathways were strongly induced by SWT in vitro and in vivo. Since Nrf2 activation has been associated with anticarcinogenic effects, the purpose of this study is to evaluate SWT's activity of cancer prevention...
March 18, 2017: Nutrients
https://www.readbyqxmd.com/read/28335390/a-simple-metallothionein-based-biosensor-for-enhanced-detection-of-arsenic-and-mercury
#4
Gordon W Irvine, Swee Ngin Tan, Martin J Stillman
Metallothioneins (MTs) are a family of cysteine-rich proteins whose biological roles include the regulation of essential metal ions and protection against the harmful effects of toxic metals. Due to its high affinity for many toxic, soft metals, recombinant human MT isoform 1a was incorporated into an electrochemical-based biosensor for the detection of As(3+) and Hg(2+). A simple design was chosen to maximize its potential in environmental monitoring and MT was physically adsorbed onto paper discs placed on screen-printed carbon electrodes (SPCEs)...
March 13, 2017: Biosensors
https://www.readbyqxmd.com/read/28335344/a-targeted-nanoprobe-based-on-carbon-nanotubes-natural-biopolymer-chitosan-composites
#5
Baoyan Wu, Na Zhao
A novel targeting theranostic nanoprobe based on single-walled carbon nanotubes (SWCNTs)-natural biopolymer chitosan composites was developed for cancer cell targeting imaging and fluorescence imaging-guided photodynamic therapy. First, chitosan was respectively conjugated with a tumor-homing molecule folic acid, or a photosensitizing drug pyropheophorbide a using a water-soluble carbodiimide coupling chemistry. Chitosan was fluorescently labeled by fluorescein isothiocyanate via the covalently linkage of the isothiocyanate group with the amino group...
November 17, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334672/effects-of-4-mbc-and-triclosan-in-embryos-of-the-frog-pelophylax-perezi
#6
Diana Martins, Marta S Monteiro, Amadeu M V M Soares, Carla Quintaneiro
The widespread and increasing use of personal care products (PCPs) have led to environmental contamination by substances included in these products. These substances have been detected in aquatic compartments and shown to cause adverse effects on non-target aquatic organisms. In this work toxicity of the antimicrobial triclosan (TCS) and of the UV-filter 3-(4-methylbenzylidene) camphor (4-MBC) was assessed in the embryos of Perez' frog Pelophylax perezi. Lethal and sub-lethal parameters were evaluated in embryos in Gosner stage 8-9 exposed to 0...
March 15, 2017: Chemosphere
https://www.readbyqxmd.com/read/28334350/relative-susceptibility-of-phyllocnistis-citrella-lepidoptera-gracillariidae-to-commonly-used-insecticides-in-maharashtra-india
#7
Anjitha George, C N Rao, Sonali Ghike, Vijay Dhengre
Foliar application of insecticides has been the most commonly followed practice to manage Phyllocnistis citrella Stainton in nurseries and flush leaves in citrus groves. Leaf dip bioassays were conducted against insecticides, viz., acephate 75SP, dimethoate 30EC, abamectin 1.9EC, fenvalerate 20EC, imidacloprid 17.8SL, and thiamethoxam 25WG, and were tested against P. citrella larvae for their susceptibility. Among six insecticides tested on second-instar P. citrella larvae collected from Nagpur mandarin/acid lime cultivars during 2013-2016, abamectin was the most toxic insecticide for the initial year (LC50 values ranged from 20...
March 3, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334211/effect-of-sweeteners-on-the-survival-of-solenopsis-invicta-hymenoptera-formicidae
#8
Xiaoqiang Zhang, Siqi Chen, Zhiqiang Li, Yijuan Xu
The red imported fire ant, Solenopsis invicta Buren, is a serious agricultural, ecological, and public health pest in its invaded range. Chemical insecticides have been widely used for the prevention and control of this notorious pest. To search for novel, cost-effective, and environmentally friendly materials for fire ant control, we tested various sweeteners for their toxicity to S. invicta. The S. invicta that were fed erythritol, aspartame, and saccharin exhibited significantly higher mortality rates than those fed other sweeteners...
March 15, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334192/insecticidal-properties-of-essential-oils-and-some-of-their-constituents-on-the-turkestan-cockroach-blattodea-blattidae
#9
Sudip Gaire, Mary O'Connell, Francisco O Holguin, Anup Amatya, Scott Bundy, Alvaro Romero
The Turkestan cockroach, Blatta lateralis (Walker), has become the most important peridomestic species in urban areas of the Southwestern United States. The aim of this study was to evaluate the use of botanical compounds to control this urban pest. We tested the acute toxicity and repellency of six botanical constituents and three essential oils on Turkestan cockroach nymphs. Chemical composition of the essential oils was also determined. Topical and fumigant assays with nymphs showed that thymol was the most toxic essential oil constituent, with a LD50 of 0...
March 3, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334064/insecticide-susceptibility-in-asian-honey-bees-apis-cerana-hymenoptera-apidae-and-implications-for-wild-honey-bees-in-asia
#10
Mika Yasuda, Yoshiko Sakamoto, Koichi Goka, Teruyoshi Nagamitsu, Hisatomo Taki
To conserve local biodiversity and ensure the provision of pollination services, it is essential to understand the impact of pesticides on wild honey bees. Most studies that have investigated the effects of pesticides on honey bees have focused on the European honey bee (Apis mellifera (Hymenoptera: Apidae)), which is commonly domesticated worldwide. However, the Asian honey bee (Apis cerana) is widely distributed throughout Asia, and toxicity data are lacking for this species. This study aimed to fill this important knowledge gap...
March 1, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334000/temperature-and-food-quantity-effects-on-the-harpacticoid-copepod-nitocra-spinipes-combining-in-vivo-bioassays-with-population-modeling
#11
Josef Koch, Thuy T Bui, Elin Lundström Belleza, Markus Brinkmann, Henner Hollert, Magnus Breitholtz
The harpacticoid copepod Nitocra spinipes has become a popular model species for toxicity testing over the past few decades. However, the combined influence of temperature and food shortage, two climate change-related stressors, has never been assessed in this species. Consequently, effects of three temperatures (15, 20 and 25°C) and six food regimes (between 0 and 5 × 105 algal cells/mL) on the life cycle of N. spinipes were examined in this study. Similarly to other copepod species, development times and brood sizes decreased with rising temperatures...
2017: PloS One
https://www.readbyqxmd.com/read/28333415/patterns-of-chemotherapy-induced-toxicities-and-outcome-in-children-and-adolescents-with-metastatic-rhabdomyosarcoma-a-report-from-the-children-s-oncology-group
#12
Abha A Gupta, Yueh-Yun Chi, James R Anderson, Elizabeth Lyden, Brenda Weigel, Carola Arndt, William H Meyer, Abby Rosenberg, Douglas S Hawkins
BACKGROUND: We sought to determine whether adolescents with metastatic alveolar rhabdomyosarcoma (ARMS) or embryonal RMS (ERMS) had a different event-free survival (EFS) compared with younger patients, and to identify treatment-related factors (adverse events, AEs) that may be associated with differences in outcome. METHODS: The prevalence of AEs in adolescents older than 13 years was compared with that in patients less than or equal to 13 years of age (Fisher exact test) in patients enrolled onto ARST0431...
March 23, 2017: Pediatric Blood & Cancer
https://www.readbyqxmd.com/read/28333314/characterization-of-e-type-colicinogenic-plasmids-from-shigella-sonnei
#13
Fatema Calcuttawala, Chellaram Hariharan, Gururaja P Pazhani, Dhira Rani Saha, Thandavarayan Ramamurthy
Colicinogenic plasmids encode toxic proteins which have antagonistic activity against closely related bacteria. This study describes the molecular characterization of three colicinogenic plasmids designated as pSSE3, pSSE and pSSE2, each with a molecular size of ∼6 kb, identified in clinical isolates of S. sonnei. Sequence analysis revealed that pSSE and pSSE2 shared extensive sequence homology with each other and with Escherichia coli E-type colicinogenic plasmids. The plasmid pSSE3 lacked an additional gene imparting immunity to colicin E8, a unique feature not observed in any of the previously reported sequences of colicin E3 plasmids...
March 15, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28333284/revisiting-the-mutant-prevention-concentration-to-guide-dosing-in-childhood-tuberculosis
#14
Devan Jaganath, H Simon Schaaf, Peter R Donald
The mutant prevention concentration (MPC) is a well-known concept in the chemotherapy of many bacterial infections, but is seldom considered in relation to tuberculosis (TB) treatment, as the required concentrations are generally viewed as unachievable without undue toxicity. Early studies revealed single mutations conferring high MICs of first- and second-line anti-TB agents; however, the growing application of genomics and quantitative drug susceptibility testing in TB suggests a wide range of MICs often determined by specific mutations and strain type...
March 9, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28333019/a-comparison-between-low-dose-rate-brachytherapy-with-or-without-androgen-deprivation-external-beam-radiation-therapy-with-or-without-androgen-deprivation-and-radical-prostatectomy-with-or-without-adjuvant-or-salvage-radiation-therapy-for-high-risk-prostate
#15
Jay P Ciezki, Michael Weller, Chandana A Reddy, Jeffrey Kittel, Harguneet Singh, Rahul Tendulkar, Kevin L Stephans, James Ulchaker, Kenneth Angermeier, Andrew Stephenson, Steven Campbell, Georges-Pascal Haber, Eric A Klein
PURPOSE: We compare the efficacy and toxicity among the 3 major modalities available used to treat high-risk prostate cancer (HRCaP). METHODS AND MATERIALS: From 1996 to 2012, 2557 HRCaP patients were treated: 734 received external beam radiation therapy (EBRT) with or without androgen deprivation therapy (ADT), 515 received low-dose-rate prostate brachytherapy (LDR) with or without ADT, and 1308 received radical prostatectomy (RP) with or without EBRT. Biochemical relapse-free survival (bRFS), clinical relapse-free survival (cRFS), and prostate cancer-specific mortality (PCSM) were assessed...
April 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28333016/predictors-of-liver-toxicity-following-stereotactic-body-radiation-therapy-for-hepatocellular-carcinoma
#16
Michael Velec, Carol R Haddad, Tim Craig, Lisa Wang, Patricia Lindsay, James Brierley, Anthony Brade, Jolie Ringash, Rebecca Wong, John Kim, Laura A Dawson
PURPOSE: To identify risk factors associated with a decline in liver function after stereotactic body radiation therapy (SBRT) for hepatocellular carcinoma. METHODS AND MATERIALS: Data were analyzed from patients with hepatocellular carcinoma treated on clinical trials of 6-fraction SBRT. Liver toxicity was defined as an increase in Child-Pugh (CP) score ≥2 three months after SBRT. Clinical factors, SBRT details, and liver dose-volume histogram (DVH) parameters were tested for association with toxicity using logistic regression...
April 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28333014/single-nucleotide-polymorphism-tgf%C3%AE-1-r25p-correlates-with-acute-toxicity-during-neoadjuvant-chemoradiotherapy-in-rectal-cancer-patients
#17
J Joshua Smith, Isaac Wasserman, Sarah A Milgrom, Oliver S Chow, Chin-Tung Chen, Sujata Patil, Karyn A Goodman, Julio Garcia-Aguilar
PURPOSE: To validate the finding of an association between single nucleotide polymorphisms (SNPs) and toxicity during chemoradiotherapy (CRT) in rectal cancer patients, in an independent population. METHODS AND MATERIALS: The cohort consisted of 165 patients who received CRT for rectal cancer from 2006 to 2012. Prospectively recorded toxicity information, graded according to the Common Terminology Criteria for Adverse Events version 3.0, was retrieved from the medical record...
April 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28332306/impact-of-iatrogenic-iron-overload-on-the-course-of-hepatitis-c-in-dialysis-population-a-plea-for-caution
#18
Guy Rostoker, Nosratola D Vaziri
About 2.5% of the world population, corresponding to about 177 million individuals, are infected by hepatitis C virus (HCV), a small, single-stranded RNA virus. The prevalence of HCV infection among dialysis patients in Japan, Europe, and North America during the 2012 to 2015 period was found to be 8.7% in the DOPPS study. Nosocomial HCV spread in hemodialysis facilities still occurs. Increased hepatic tissue iron has been shown to play a deleterious role in the course of hepatitis C, favor development of fibrosis and cirrhosis and possibly increase the risk of liver cancer in the general population...
March 23, 2017: Hemodialysis International
https://www.readbyqxmd.com/read/28332174/effects-of-carbon-nanotube-and-biochar-on-bioavailability-of-pb-cu-and-sb-in-multi-metal-contaminated-soil
#19
Meththika Vithanage, Indika Herath, Yaser A Almaroai, Anushka Upamali Rajapaksha, Longbin Huang, Jwa-Kyung Sung, Sang Soo Lee, Yong Sik Ok
This study examined the effects of carbon nanotube and biochar on the bioavailability of Pb, Cu and Sb in the shooting range soils for developing low-cost remediation technology. Commercially available multi-walled carbon nanotube (MWCNT) and biochar pyrolyzed from soybean stover at 300 °C (BC) at 0.5, 1 and 2.5% (w w(-1)) were used to remediate the contaminated soil in an incubation experiment. Both DTPA (bioavailable) and TCLP (leaching) extraction procedures were used to compare the metal/loid availability and leaching by the amendments in soil...
March 22, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28332138/benzo-a-pyrene-exposure-causes-genotoxic-and-biochemical-changes-in-the-midge-larvae-of-chironomus-sancticaroli-strixino-strixino-diptera-chironomidae
#20
M Vicentini, G S Morais, D Rebechi-Baggio, V S Richardi, G S Santos, M M Cestari, M A Navarro-Silva
Benzo(a)pyrene (BaP) is a carcinogenic polycyclic aromatic hydrocarbon, also found in nature due to human activities. BaP adheres to sediments showing toxic effects on benthic organisms, including midge larvae of the family Chironomidae. We tested for toxic effects of benzo(a)pyrene on Chironomus sancticaroli Strixino & Strixino 1981 using biochemical and genotoxic biomarkers, to identify changes in metabolic and antioxidant pathways, besides neurotoxic and DNA damage. Enzyme activity was compared by exposing larvae to four nominal concentrations (0...
March 22, 2017: Neotropical Entomology
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