How to track bacteria.

نویسنده

  • H C Berg
چکیده

The Harvard community has made this article openly available. Please share how this access benefits you. Your story matters. A microscope is described which automatically remains focused on individual motile bacteria. The container in which the bacteria are suspended is moved in such a way that the position of a given organism remains fixed; x, y, and z drive signals provide a measure of its displacement relative to the suspension medium. Records are shown of the motion of Escherischia coli.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Influences of Track Structure, Geometry and Traffic Parameters on Railway Deterioration

The roles of the several parameters that influences railway track deterioration most, are examined in this research with a view to make railway track maintenance more effective and cost efficient. The results presented are based on a comprehensive study of railway track degradation on super structure, sub-structure and geometrical aspects. The changes in TQI (Track Quality Index), the track set...

متن کامل

Investigation of the Talent Identification Factors and Talent Education Development on Track & Field's Athletes in Iran

Objective: The purpose of current investigation is studding of talent identification factors and education talent development on the track & field's athletes in Iran by views of experts, coaches and athletes.Methodology: The descriptive research method was used in current research. The number of 150 experts, coaches and athletes were recruited in this research.  The number of 6 variables and 45...

متن کامل

Investigation of the Talent Identification Factors and Talent Education Development on Track & Field's Athletes in Iran

Objective: The purpose of current investigation is studding of talent identification factors and education talent development on the track & field's athletes in Iran by views of experts, coaches and athletes.Methodology: The descriptive research method was used in current research. The number of 150 experts, coaches and athletes were recruited in this research.  The number of 6 variables and 45...

متن کامل

Investigation of the Influences of Track Superstructure Parameters on Ballasted Railway Track Design

The main design criteria of ballasted railway tracks include rail deflections, rail bending stresses, rail wheel contact stresses, sleeper bending moments and ballast sleeper contact pressures. Numerous criteria have been defined for the design of ballasted railway tracks owing to the various mechanical properties of track components and their complex interaction. Therefore, railway track desig...

متن کامل

Numerical Investigation of Rail Bending Behaviour Focusing on the Effect of Track Modulus

Thorough understanding of steel rail response to wheel load is a key step towards design and evaluation of the railway track structure. In current practice, maximum vertical deflection and bending moment are calculated using the theory of infinite beam on continuous elastic foundation (Winkler model), in which the foundation stiffness is assumed as constant. However, variation of track modulus ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • The Review of scientific instruments

دوره 42 6  شماره 

صفحات  -

تاریخ انتشار 1971