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antibiotic development

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https://www.readbyqxmd.com/read/29677683/application-of-solid-phase-microextraction-followed-by-liquid-chromatography-mass-spectrometry-in-the-determination-of-antibiotic-drugs-and-their-metabolites-in-human-whole-blood-and-tissue-samples
#1
Malgorzata Szultka-Mlynska, Pawel Pomastowski, Boguslaw Buszewski
A sensitive, rapid and specific analytical method using high performance liquid chromatography coupled with mass spectrometry (HPLC-QqQ-MS) was developed to determine selected antibiotic drugs and their metabolites (amoxicillin, cefotaxime, ciprofloxacin, clindamycin and metronidazole; amoxycilloic acid, 4-hydroxyphenyl glycyl amoxicillin, desacetyl cefotaxime, 3-desacetyl cefotaxime lactone, ciprofloxacin N-oxide, N-demethylclindamycin, clindamycin sulfoxide, and hydroxy metronidazole) in human whole blood and vascularized tissue after single oral administration...
April 12, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29677484/degree-of-time-dependency-of-kinetic-coefficient-as-a-function-of-adsorbate-concentration-new-insights-from-adsorption-of-tetracycline-onto-monodispersed-starch-stabilized-magnetic-nanocomposite
#2
Chukwunonso P Okoli, Augustine E Ofomaja
The realization that the observed kinetic coefficient (kobs ) varies with time in most real-time adsorption system, as against the constant value conceived in the most widely-applied adsorption kinetic models, have attracted much attention in recent time. Understanding the factors that control the extent/degree of time dependency (otherwise known as fractal-like kinetics), is therefore central in taking manipulative advantage of this phenomenon in critical adsorption applications. This study therefore deployed non-fractal-like and fractal-like kinetic approach to study the adsorption of tetracycline on monodispersed starch-stabilized magnetite nanocomposite (MSM)...
April 17, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29677189/progress-in-the-pharmacological-treatment-of-human-cystic-and-alveolar-echinococcosis-compounds-and-therapeutic-targets
#3
Mar Siles-Lucas, Adriano Casulli, Roberto Cirilli, David Carmena
Human cystic and alveolar echinococcosis are helmintic zoonotic diseases caused by infections with the larval stages of the cestode parasites Echinococcus granulosus and E. multilocularis, respectively. Both diseases are progressive and chronic, and often fatal if left unattended for E. multilocularis. As a treatment approach, chemotherapy against these orphan and neglected diseases has been available for more than 40 years. However, drug options were limited to the benzimidazoles albendazole and mebendazole, the only chemical compounds currently licensed for treatment in humans...
April 20, 2018: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29677137/phages-make-for-jolly-good-stories
#4
Thomas Häusler
Phage therapy has an intriguing history. It was widely used from the 1920s until the 1940s. After this period, it was nearly completely forgotten in the Western world, while it continued to be used in the Soviet part of the globe. The study of the history of phage therapy provides valuable input into the present development of the field. Science journalists uncovered much of this history and played an important role in the communication of phage therapy after the fall of the Soviet Union, when it came to the attention of Western researchers and doctors...
April 20, 2018: Viruses
https://www.readbyqxmd.com/read/29676738/a-survey-of-crop-derived-transgenes-in-activated-and-digester-sludges-in-wastewater-treatment-plants-in-the-united-states
#5
Courtney M Gardner, Carley A Gwin, Claudia K Gunsch
The use of transgenic crops has become increasingly common in the United States over the last several decades. Increasing evidence suggests that DNA may be protected from enzymatic digestion and acid hydrolysis in the digestive tract, suggesting that crop-derived transgenes may enter into wastewater treatment plants (WWTPs) intact. Given the historical use of antibiotic resistance genes as selection markers in transgenic crop development, it is important to consider the fate of these transgenes. Herein we detected and quantified crop-derived transgenes in WWTPs...
April 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29676403/combined-endoscopic-transorbital-and-endonasal-repair-of-high-flow-orbital-apex-middle-fossa-cerebrospinal-fluid-leak-with-a-nasoseptal-flap
#6
Brandon Lucke-Wold, Gustavo Mendez, David Cua, Paul Akins, Haley Gillham, Jeremy Ciporen
Background and importance: High flow orbital apex or middle fossa cerebrospinal fluid (CSF) leaks can be life threatening and complex to repair. These leaks associated with large dural defects are most commonly repaired with an open temporalis muscle patch or free flaps, but these flaps do not always stop the leak. Clinical Presentation: A 65-year-old patient presented two years after orbital exenteration and radiation for squamous cell carcinoma. He developed multi-organism meningitis and pneumocephalus secondary to a large high-flow orbital apex/middle fossa CSF leak...
2018: J Neuroinflamm Neurodegener Dis
https://www.readbyqxmd.com/read/29676244/resistance-of-bacteria-to-biocides
#7
Jean-Yves Maillard
Biocides and formulated biocides are used worldwide for an increasing number of applications despite tightening regulations in Europe and in the United States. One concern is that such intense usage of biocides could lead to increased bacterial resistance to a product and cross-resistance to unrelated antimicrobials including chemotherapeutic antibiotics. Evidence to justify such a concern comes mostly from the use of health care-relevant bacterial isolates, although the number of studies of the resistance characteristics of veterinary isolates to biocides have increased the past few years...
April 2018: Microbiology Spectrum
https://www.readbyqxmd.com/read/29676014/autoinflammatory-disease-in-the-lung
#8
REVIEW
Thomas Scambler, Jonathan Holbrook, Sinisa Savic, Michael F McDermott, Daniel Peckham
Ascertaining the dominant cell type driving an immunological disease is essential to understanding the causal pathology and, therefore, selecting or developing an effective treatment. Classifying immunological diseases in this way has led to successful treatment regimens for many monogenic diseases; however, when the dominant cell type is unclear and there is no obvious causal genetic mutation, then identifying the correct disease classification and appropriate therapy can be challenging. In this review we focus on pulmonary immunological diseases where an innate immune signature has been identified as a predominant aspect of the immunopathology...
April 19, 2018: Immunology
https://www.readbyqxmd.com/read/29675919/therapy-and-outcome-of-staphylococcus-aureus-infections-of-intracorporeal-ventricular-assist-devices
#9
Miquel B Ekkelenkamp, Mats T Vervoorn, Jumamurat R Bayjanov, Ad C Fluit, Barry J Benaissa-Trouw, Faiz Z Ramjankhan
Infection of the driveline or pump pocket is a common complication in patients with ventricular assist devices (VADs) and Staphylococcus aureus is the main pathogen causing such infections. Limited evidence is currently available to guide the choice of antibiotic therapy and the duration of treatment in these patients. Patients at the University Medical Center Utrecht who developed a VAD-related S. aureus infection between 2007 and 2016 were retrospectively assessed. Blood culture isolates were typed by whole genome sequencing to differentiate between relapses and reinfections, and to determine whether antibiotic therapy had led to acquisition of resistance mutations...
April 19, 2018: Artificial Organs
https://www.readbyqxmd.com/read/29675898/implementation-of-the-who-surgical-safety-checklist-at-a-teaching-hospital-in-india-and-evaluation-of-the-effects-on-perioperative-complications
#10
Raghavendra Shankar
BACKGROUND: The WHO Surgical Safety Checklist was developed to help operating teams reduce the occurrence of patient harm. The Checklist is a simple, practical tool that any surgical team in the world can use to ensure that the preoperative, intraoperative, and postoperative steps that have been shown to benefit patients are undertaken in a timely and efficient way. METHODS: This study was carried out at Rajarajeswari Medical College Hospital, Bangalore, India, to study the effects of the WHO Surgical Safety Checklist on mortality and morbidity in surgical patients, to identify the potential problems in the long-term implementation of the same, and to document the complications in patients undergoing a major surgery during the study period...
April 20, 2018: International Journal of Health Planning and Management
https://www.readbyqxmd.com/read/29675400/simultaneous-detection-of-key-bacterial-pathogens-related-to-pneumonia-and-meningitis-using-multiplex-pcr-coupled-with-mass-spectrometry
#11
Chi Zhang, Leshan Xiu, Yan Xiao, Zhengde Xie, Lili Ren, Junping Peng
Pneumonia and meningitis continue to present an enormous public health burden and pose a major threat to young children. Among the causative organisms of pneumonia and meningitis, bacteria are the most common causes of serious disease and deaths. It is challenging to accurately and rapidly identify these agents. To solve this problem, we developed and validated a 12-plex PCR coupled with matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) method (bacterial pathogen-mass spectrometry, BP-MS) that can be used to simultaneously screen for 11 key bacterial pathogens related to pneumonia and meningitis...
2018: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/29675000/exploring-additional-dimensions-of-complexity-in-inhibitor-design-for-serine-%C3%AE-lactamases-mechanistic-and-intra-and-inter-molecular-chemistry-approaches
#12
REVIEW
Focco van den Akker, Robert A Bonomo
As a bacterial resistance strategy, serine β-lactamases have evolved from cell wall synthesizing enzymes known as penicillin-binding proteins (PBP), by not only covalently binding β-lactam antibiotics but, also acquiring mechanisms of deacylating these antibiotics. This critical deacylation step leads to release of hydrolyzed and inactivated β-lactams, thereby providing resistance for the bacteria against these antibiotics targeting the cell wall. To combat β-lactamase-mediated antibiotic resistance, numerous β-lactamase inhibitors were developed that utilize various strategies to inactivate the β-lactamase...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29674769/helicobacter-cinaedi-associated-carotid-arteritis
#13
Shinichiro Nakao, Hideharu Hagiya, Keigo Kimura, Tomomi Mitsui, Akane Oyama, Kazuhiro Hongyo, Yusuke Takahashi, Futoshi Nakagami, Kazunori Tomono, Hiromi Rakugi
A 65-year-old Japanese man with bilateral carotid atherosclerosis presented with right neck pain and fever. Contrast-enhanced computed tomography suggested carotid arteritis, and carotid ultrasonography showed an unstable plaque. The patient developed a cerebral embolism, causing a transient ischemic attack. Helicobacter cinaedi was detected in blood culture, and H. cinaedi-associated carotid arteritis was diagnosed. Empirical antibiotic therapy was administered for 6 weeks. After readmission for recurrent fever, he was treated another 8 weeks...
April 2018: Acta Medica Okayama
https://www.readbyqxmd.com/read/29674370/effect-of-a-single-prophylactic-preoperative-oral-antibiotic-dose-on-surgical-site-infection-following-complex-dermatological-procedures-on-the-nose-and-ear-a-prospective-randomised-controlled-double-blinded-trial
#14
Helena Rosengren, Clare F Heal, Petra G Buttner
OBJECTIVES: There is limited published research studying the effect of antibiotic prophylaxis on surgical site infection (SSI) in dermatological surgery, and there is no consensus for its use in higher-risk cases. The objective of this study was to determine the effectiveness of a single oral preoperative 2 g dose of cephalexin in preventing SSI following flap and graft dermatological closures on the nose and ear. DESIGN: Prospective double-blinded, randomised, placebo-controlled trial testing for difference in infection rates...
April 19, 2018: BMJ Open
https://www.readbyqxmd.com/read/29674074/fluorescent-microarray-for-multiplexed-quantification-of-environmental-contaminants-in-seawater-samples
#15
Ana Sanchis, J-Pablo Salvador, Katrina Campbell, Christopher T Elliott, Weilin L Shelver, Qing X Li, M-Pilar Marco
The development of a fluorescent multiplexed microarray platform able to detect and quantify a wide variety of pollutants in seawater is reported. The microarray platform has been manufactured by spotting 6 different bioconjugate competitors and it uses a cocktail of 6 monoclonal or polyclonal antibodies raised against important families of chemical pollutants such as triazine biocide (i.e. Irgarol 1051®), sulfonamide and chloramphenicol antibiotics, polybrominated diphenyl ether flame-retardant (PBDE, i.e...
July 1, 2018: Talanta
https://www.readbyqxmd.com/read/29674034/a-voltammetric-test-for-the-rapid-discrimination-of-%C3%AE-lactamase-producing-enterobacteriaceae-in-blood-cultures
#16
Laetitia Betelli, Catherine Neuwirth, Sébastien Solanas, Benoît Chantemesse, Fabienne Vienney, Alain Hartmann, Murielle Rochelet
The accurate identification of β-lactamases produced by Enterobacteriaceae is a major challenge in clinical laboratories in order to optimize antimicrobial treatment and patient care. We describe here a rapid voltammetric-based method to detect and to discriminate β-lactamase activity in Enterobacteriaceae i.e., penicillinase, cephalosporinase (inducible or overproduced), extended-spectrum beta-lactamase and carbapenemase producers. After a 2-h growth step of the sample under three separate conditions: 1) LB (Luria-Bertani) medium, 2) LB supplemented with 4 μg/mL cefotaxime and 3) LB supplemented with 4 μg/mL cefotaxime and 100 μg/mL potassium clavulanate, the β-lactamase activity was measured by incubating a 0...
July 1, 2018: Talanta
https://www.readbyqxmd.com/read/29673984/bioinformatics-analysis-and-epitope-screening-of-a-potential-vaccine-antigen-tolb-from-acinetobacter-baumannii-outer-membrane-protein
#17
Xiaojie Song, Hua Zhang, Dongsheng Zhang, Weifeng Xie, Guanghui Zhao
The clinical isolation rate of multidrug-resistant or pan-resistant Acinetobacter baumannii (A. baumannii) is increasing, resulting that optional antibiotics are very limited in clinical practice. To deal with such a dilemma in treatment, the development of effective vaccines serves as a good strategy. Outer membrane proteins (Omp) often contain potential excellent vaccine antigens, and NCBI has published >300 Omp sequences of A. baumannii (including the duplicates). To accurately screen out the potential excellent antigen molecules from a large number of sequences, and avoid repetitive experimental processes is of great significance...
April 16, 2018: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/29673558/incidence-and-treatment-of-complications-in-patients-who-had-third-molars-or-other-teeth-extracted
#18
I Miclotte, J O Agbaje, Y Spaey, P Legrand, C Politis
The aim of this study was to compare the incidence of complications after extraction of third molars (M3) or other teeth, and to describe their management. We made a retrospective cohort study of patients having M3 or other teeth extracted, and recorded complications up to two years' follow-up. A total of 142 complications developed after 2355 procedures (6%) - 7% after extraction of M3 compared with 5% after extractions of other teeth (p=0.024). The three most common complications were wound infection (2%), pain without apparent cause (<1%), and oroantral communication (<1%)...
April 16, 2018: British Journal of Oral & Maxillofacial Surgery
https://www.readbyqxmd.com/read/29673157/optimization-of-stress-based-microfluidic-testing-for-methicillin-resistance-in-staphylococcus-aureus-strains
#19
Maxim Kalashnikov, Jean C Lee, Alexis F Sauer-Budge
The rapid evolution of antibiotic resistance in bacterial pathogens is driving the development of innovative, rapid antibiotic susceptibility testing (AST) tools as a way to provide more targeted and timely antibiotic treatment. We have previously presented a stress-based microfluidic method for the rapid determination of antibiotic susceptibility in methicillin-susceptible Staphylococcus aureus (MSSA) and methicillin-resistant Staphylococcus aureus (MRSA). In this method, stress is used to potentiate the action of antibiotics, and cell death is measured as a proxy for susceptibility...
April 17, 2018: Diagnostics
https://www.readbyqxmd.com/read/29671805/improving-the-activity-of-trp-rich-antimicrobial-peptides-by-arg-lys-substitutions-and-changing-the-length-of-cationic-residues
#20
Mauricio Arias, Kathlyn B Piga, M Eric Hyndman, Hans J Vogel
Antimicrobial peptides (AMPs) constitute a promising alternative for the development of new antibiotics that could potentially counteract the growing number of antibiotic-resistant bacteria. However, the AMP structure⁻function relationships remain unclear and detailed studies are still necessary. The positively charged amino acid residues (Arg and Lys) play a crucial role in the activity of most AMPs due to the promotion of electrostatic interactions between the peptides and bacterial membranes. In this work we have analyzed the antimicrobial and structural properties of several Trp-rich AMPs containing exclusively either Arg or Lys as the positively charged residues...
April 19, 2018: Biomolecules
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