Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 29, No. 1 (January 2016) 132-136    Article in Press

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  A MECHANISM UNDERLYING THE ELECTRICAL POLARITY DETECTION OF SENSITIVE PLANT, MIMOSA PUDICA
 
R. Khanbabaie
 
( Received: December 20, 2015 – Accepted: January 28, 2016 )
 
 

Abstract    Natural indicators of the electrical polarity of a direct current (DC) source is limited to semiconductor based diodes and transistors. Recently a novel bio-natural indicator of the polarity of a DC source have been reported. Mimosa Pudica or sensitive plant is found to be a natural detector of a DC source polarity, however the mechanism underlying this phenomenon is not known. This paper aims to develop a physical and engineering based model to explain the mechanism of this phenomenon. This model suggests that spatial placement of ion release sites along the pathway of electric signal is crucial to obtain polarity effects. A combination of this spatial placement of ion release sites and a delay in the opening of K+ ion channel with respect to Cl- ion channel can explain this one-way switch behavior.

 

Keywords    Bio-natural polarity indicator, DC electric polarity, Electrical Polarity detector, One-way switch

 

چکیده    تشخیص ­دهنده­ های های قطب­های الکتریکی یک منبع جریان مستقیم فقط به دیودها و ترانزیستورهای بر پایه نیمه ­رساناها محدود می ­شوند. اخیرا یک نشانگر زیستی-طبیعی جدید قطب­های الکتریکی یک منبع جریان مستقیم گزارش شده است. مشخص شده است گیاه حساس (میموزا پودیکا) یک نشانگر طبیعی و زنده قطب­های الکتریکی است، ولی سازوکار عملکرد آن مشخص نیست. این مقاله یک مدل فیزیکی-مهندسی را برای توضیح این پدیده ارائه می­کند. این مدل پیشنهاد می­کند که محل فضایی سایت­ های آزادسازی یون در طول مسیر سیگنال الکتریکی جهت دست­یابی به اثرات قطبش ضروری است. ترکیبی از محل قرارگیری سایت­های آزادسازی یون و یک تاخیر در بازشدن کانال یون پتاسیم نسبت به کانال یون سدیم می­تواند این رفتار سوئیچ یک طرفه را توضیح دهد

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