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Preface to Advances in Artificial Life, Evolutionary Computation, and Systems Chemistry 11th Italian Workshop, WIVACE 2016, Fisciano, Italy, October 4-6, 2016, Revised Selected Papers
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YADAMP: Yet Another Database of Antimicrobial Peptides
No full textThis work presents an antimicrobial peptide database (YADAMP) based on an extensive literature search. This database is focused primarily on bacteria, with detailed information for 2133 peptides active against bacteria. YADAMP was born to facilitate access to critical information on antimicrobial peptides (AMPs). The main difference between YADAMP and other web databases of AMP is the explicit presence of antimicrobial activity against the most common bacterial strains. YADAMP allows complex queries, easily accessible through a web interface. Peptide information can be retrieved based on peptide name, number of amino acids, net charge, hydrophobic percentage, sequence motif, structure and activity against bacteria. YADAMP is suitable for reviewing information on AMP, and for structure–function analyses of peptides. The database can be accessed via a web‐based browser at the URL: http://www.yadamp.unisa.it
Electronic memory effect in a crystalline silicon/polyether heterostructure
No full textOrganic/inorganic heterojunctions have been fabricated by spin-coating of an oxadiazole based polyether on top of either n-type or p-type crystalline silicon substrates . The prepared heterodiodes showed good rectification. During currentvoltage measurements sharp current switching effects have been observed in the reverse bias characteristics for both types of heterodiodes. In particular a very stable hysteresis in the reverse characteristics of the polyether / n-type crystalline silicon has been measured at applied voltages below 1V. The application of this heterodiode as electrical memory with an on/off-ratio of about 2 orders of magnitude has been demonstrated
Synthesis and characterization of new photoluminescent oxadiazole/carbazole-containing polymers
No full textWe report on the synthesis and the characterization of a new class of segmented polyethers POC containing the oxadiazole and
carbazole units. The polymers exhibit a high thermal stability, high glass transition temperatures, and good solubility in common
organic solvents, despite the extended aromatic portion in the main polymer chain. The synthetic procedures are simple, and
no acid side-products are obtained. According to previous reports on oxadiazole/carbazole-containing materials, POCs show
high photoluminescence activity in the blue region of the visible spectra. The good solubility in chlorinate solvents allows the
preparation of films with homogeneous thickness by spin coating. Glass transition temperature in the range 115–125◦C ensures
good stability of film morphology at room temperature. The only exception is POC(6), which shows a poor solubility and higher
Tg (170◦C), due to its shorter aliphatic chain portion. For these features, polymers POC are potential candidate materials for
fabricating blue light-emitting devices
Oxadiazole Based Polyether as Sensitive Films for Ratiometric Optical Temperature Detection
Full text linkA new type of polymer, based on the oxadiazole group, has been tested as indicator material for a ratiometric photoluminescence and optical reflection based temperature sensor in the temperature range between 30°C and 60°C. Thin films of the new polymer have been deposited by spin-coating on a glass substrate, excited by means of a low-cost near UV-LED. The optical spectrum, as detected by a fiber-based PC-card optical spectrometer, consisted of the reflection peak at the excitation wavelength and two distinct photoluminescence peaks at 430 nm and 480 nm, both in the blue spectral region. The peak amplitudes of all three spectral peaks depend linearly on the exciting light intensity. Changing the sample temperature, all peak amplitude values decrease monotonously with increasing temperature. By using a ratiometric approach, it has been found that the ratio between the two photoluminescence peaks was almost constant with temperature, while the ratio between the main photoluminescence peak at 430 nm and the reflection peak around 380 nm scaled nicely with the ambient temperature. Therefore, it has been proposed to use the latter criterion and a simple polynomial fit to the temperature versus peak amplitude relation
Organic memory device with large conductanceswitching based on oxadiazole–containing Polyether thin films
No full textMolecular Structure in the Crystalline Phase of a Segmented Liquid Crystalline Polyester
No full textMolecular structure refinement of a liquid crystalline segmented polymer using X-ray diffraction methods is reported. The investigated polymer contains the 3-allylbiphenyl unit as nematogenic unit. The space group is P21/a, with cell parameters a ) 12.82 Å, b ) 8.44 Å, c ) 19.72 Å, and â ) 153.2°, with two chains per unit cell. The main feature of this molecular packing is the layered organization of chains with a transversal intercalation of the flexible and the rigid units in the layer. Repetition of layers in space leads to an herringbone packing of biphenyl units along [001]. Transversal register between chains is such that the two phenyl rings of biphenyl unit are involved in “edge to face” contact
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