Molecular Biology, Bioinstrumentation & Biotechniques

A better device is the triac, bidirectional thyristor, which allows the full a.c. power to be controlled. It comprises two thyristors connected in parallel and working in opposition but controlled by the same gate. The trigger pulses to a triac are provided by a special device called diac, bidirectional breakdown diode. It is, in effect, two Zener diodes connected back to back. The diac conducts in either direction if the applied voltage reaches the breakdown voltage of about 30 V. This

Oral cancer is the sixth most common malignancy with almost 500000 new cases reported worldwide annually. The diagnosis of oral cancer at an early stage has a good prognosis as the survival rate is high (around 80%). However, the majority of oral cancer cases are diagnosed at a later stage with a considerably poor 5-year survival rate of 50% according to World Health Organization statistics. Thus, an effective management strategy for oral cancer will depend on its early identification and intervention which would pave the way for superior prognosi

Aloe vera is India’s most favorite herbal medicinal plant that is require low maintenance and easy to grow. The name of aloe is derived from Arabic word “Alloeh” meaning a shining bitter substance. Aloe vera belongs to the family Asphodelaceae (liliaceae) (Ghazanfar, 1994). It grows mainly in the dry regions of Africa, Asia, Europe and America. In India, it is found in Rajasthan, Andhra Pradesh, Gujrat, Maharashtra, and Tamil Nadu. Aloe vera is popular in Ayurvedic medicine (Richard, 2005). There are more than 300 species of aloe plants. This plant has yellow flower the leaves are arranged in rosette configuration. They are triangular and spear like and have thorny ridges. Aloe vera is a customary, dry spell dispute, sticky plant.