Disappearance of diphtheria.

Diphtheria

Gentlemen,?I have occasionally heard a man, about to read a paper upon some subject, commence by expressing his sense of his unfitness for the task he has undertaken. I have, I must confess, looked upon this appeal, ad misericordiam, with much suspicion, believing the writer, did he not in his own heart believe himself particularly well-fitted for the work, would not have undertaken it. To-day,...

Diphtheria

OPTIMIZATION OF DIPHTHERIA TOXOID PRECIPITATION BY USING SATURATED AMMONIUM SULPHATE IN ORDER TO IMPROVE DIPHTHERIA VACCINE

سابقه و هدف: کورینه باکتریوم دیفتریه باکتری هوازی و بی­هوازی اختیاری است. مهم­ترین گونه از خانواده کورینه ‌باکتریاها، عامل بیماری دیفتری است که به ­وسیله توکسین خود، بیماری دیفتری را ایجاد می­کند. آمونیم ­سولفات نمکی معدنی است که از آن برای ترسیب و خالص­سازی پروتئین ها استفاده می­شود که با افزایش مقدار نمک حلالیت پروتئینی کم شده و پروتئین ­ها به­ واسطه قطعه­ های هیدروفوب خود، به­هم پیوسته و رسو...

Disappearance of Resonance Tongues

where ai(t) = Pi + εQi cos2t, where Pi,Qi and ε are given constants, and where it is assumed that when ε=0 this system exhibits a pair of linearly independent solutions of period 2π . Since the driver cos2t has period π , we have the ingredients for a 2:1 subharmonic resonance which typically results in a tongue of instability involving unbounded solutions when ε >0. We present conditions on th...

Diphtheria Immunization *

AT the beginning of the twentieth century diphtheria occupied a unique position in contrast to other infectious diseases. Its symptoms and course were well known and accurately described, the causal organism definitely recognized, and a specific remedy was available for its treatment, yet in spite of this wealth of scientific knowledge the control and prevention of the disease had proved a comp...