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Techniques for the generation and monitoring of vapors
Controlled test atmospheres can be produced using a variety of techniques. Gases are usually generated by using flow dilution methods while vapors are produced by using solvent injection and vaporization, saturation, permeation and diffusion techniques. The resulting gas mixtures can be monitored and measured using flame ionization, photoionization, electrochemical and infrared analytical systems. An ideal system for the production of controlled test atmospheres would not only be able to generate controlled test atmospheres, but also monitor all pertinent environmental parameters, such as temperature, humidity, and air flow
An acidic model pro-peptide affects the secondary structure, membrane interactions and antimicrobial activity of a crotalicidin fragment
In order to study how acidic pro-peptides inhibit the antimicrobial activity of antimicrobial peptides, we introduce a simple model system, consisting of a 19 amino-acid long antimicrobial peptide, and an N-terminally attached, 10 amino-acid long acidic model pro-peptide. The antimicrobial peptide is a fragment of the crotalicidin peptide, a member of the cathelidin family, from rattlesnake venom. The model pro-peptide is a deca (glutamic acid). Attachment of the model pro-peptide only leads to a moderately large reduction in the binding to- and induced leakage of model liposomes, while the antimicrobial activity of the crotalicidin fragment is completely inhibited by attaching the model pro-peptide. Attaching the pro-peptide induces a conformational change to a more helical conformation, while there are no signs of intra- or intermolecular peptide complexation. We conclude that inhibition of antimicrobial activity by the model pro-peptide might be related to a conformational change induced by the pro-peptide domain, and that additional effects beyond induced changes in membrane activity must also be involved.</p
Milk yield and composition, feed intake and stocking rate of crossbread cows in tropical grasses managed in a rotational grazing system
CaracterĂsticas do pasto e eficiĂȘncia agronĂŽmica de nitrogĂȘnio em capim-tanzĂąnia sob pastejo contĂnuo, adubado com doses de nitrogĂȘnio
Fluxo de biomassa aérea em azevém anual manejado sob duas intensidades e dois métodos de pastejo
Evaluation of ejector systems for ETS-1. Interim report, 1 October 1962-- 31 January 1963
RESPIRATOR CARTRIDGE EFFICIENCY STUDIES. IV. EFFECTS OF STEADY-STATE AND PULSATING FLOW.
Detecting chronic apical periodontitis for improved endodontic success
Endodontic treatments are frequently carried out in daily
clinical practice. The presence or absence of a periapical
radiolucency, assessed using intraoral radiographs, is one
of the criteria used to determine endodontic success. When
such a lesion is present around the apex of a tooth, the
condition is known as chronic apical periodontitis. While
this is common around root treated teeth, it can also be
associated with otherwise healthy teeth. In both instances, it
represents an inflammatory response to bacteria or irritants
in the periapical space, and results in bone loss and areas
of reduced density, which can then form apical granulomas
or cysts. The literature has shown that periapical lesions
can go undetected, due to the two-dimensional limitations
of periapical radiographs. These âhiddenâ lesions can
compromise the longevity of the tooth. Considering that
apical periodontitis can be far more accurately detected
and diagnosed on cone beam computed tomography, it
has been recommended by several authors that endodontic
treatment outcomes ideally should be evaluated using this
imaging modality, whenever possible.https://www.sada.co.za/the-sadjam2018Prosthodontic
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