03214nas a2200349 a 450000500170000000800410001703500150005809900230007310000250009624501180012126000670023930000390030649000310034550001290037650200570050552017370056265000180229965000090231765000240232670000330235070000460238370000450242970000430247471000710251771000650258881000630265385600650271690700250278190200110280699800280281799900190284520260818213706.0230831s2013    th    m rtt   0|    eng d  a.b12411814 9aAIT Diss no.ISE-131 aNazir, Aneeqa Sabah 10aSelf organization of charge stabilized gold nanoparticles on directed fungal mycelia directed by external stimuli  aPathum Thani, Thailand :bAsian Institute of Technology,c2013  a94 p. :bill. +e1 online resource1 aDissertation ;vno. ISE-13  aA dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Nanotechnology  aThesis (Ph.D.) - Asian Institute of Technology, 2013  aAligned and structured point-to-point biomimetic microwires growth was attempted by controlled integration of microbial tropism and self-organization of metallic nanoparticles (glutamate capped gold colloids) on living template of Aspergillus niger (A. niger) hyphae. Ajinomoto® (MSG) served as the stabilizing and reducing agent for gold colloid nanoparticles and also acted as a source of nutrients for the growth of fungal hyphae. Because the tips of growing fungi are sensitive to surrounding physical or chemical environmental changes, fabrication of polarized micro-assemblies were made possible by the application of various tropic factors like visible light, nutrient flow, temperature, relative humidity (rH) as well as physical contact and gravity. Gold microwires fabricated in this way had length beyond 1mm and of about 1 to 2 om diameter. These wires showed the maximum divergence of 40⁰-50⁰ from the light path irrespective of different illuminated colour and displayed wide variation in dimension and morphology. Fungal growth in terms of hyphal length, branched intensity as well as re-orientation was analyzed statistically. Optical modeling was done successfully to visualize the phototropic response of fungal templated gold microwires towards different wavelengths. Whereas, thigmotropism and gravisensing did not show demonstrable patterning of templated wires under the same conditions. To the best of our knowledge, this is first time that the application of tropism and self-organization on living entities were used in conjunction to pattern the mesh of ultrathin, small, and robust microwires having high surface area for potential applications in sensing, catalysis, electronic and optical industry. 0aNanoparticles 0aGold 0aOrganization Change1 aDutta, Joydeep,eChairperson1 aHornyak, Gabor L.,eExamination committee1 aAnal, Anil Kumar,eExamination Committee1 aKumar, Prabhat,eExamination committee2 aLahore College for Women University, Pakistan,eScholarship donor 2 aAsian Institute of Technology Fellowship,eScholarship donor2 aAsian Institute of Technology.tDissertation ;vno. ISE-13  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B06132  a.b12411814bmnaitcm  a240419  b0c230831dmea  fmg0  c105685d105685