introduction acetic acid bacteria are large group of obligate aerobic gram negative bacteria with the ability to oxidize ethanol to acetic acid (1). they are widely distributed in natural habitats and classified in family acetobacteraceae. members of this family are useful in industrial production of vinegar(2). acetic acid bacteria (aab) can use substrates as glucose, ethanol, lactate or glyc...

ترکیبات آلی فسفردار به عنوان حدواسط های بسیار مهم در سنتز ترکیبات آلی کاربرد دارند. از این ترکیبات در صنعت، کشاورزی و شیمی استفاده فراوانی شده است. دسته بسیار مهمی از این ترکیبات ?- آمینوفسفینیک اسیدها هستند که در منابع علمی روش های محدودی برای تهیه آنها گزارش شده است. ارائه روش جدید و مناسب برای سنتز این ترکیبات در حال حاضر بسیار حائز اهمیت است بنابراین در این پروژه روش هایی برای سنتز مشتقات ج...

the space now known as complete erdos space ec was introduced by paul erdos in 1940 as the closed subspace of the hilbert space ?2 consisting of all vectors such that every coordinate is in the convergent sequence {0} ? { 1 n : n ? n}. in a solution to a problem posed by lex g. oversteegen we present simple and useful topological characterizations of ec. as an application we determine the ...

in this thesis, a structured hierarchical methodology based on petri nets is used to introduce a task model for a soccer goalkeeper robot. in real or robot soccer, goalkeeper is an important element which has a key role and challenging features in the game. goalkeeper aims at defending goal from scoring goals by opponent team, actually to prevent the goal from the opponent player’s attacks. thi...