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H. W. Conn. The Story of Germ Life
The Story of Germ Life
Table of Contents
PREFACE
JULY, 1915. I.—BACTERIA AS PLANTS
II.—MISCELLANEOUS USES OF BACTERIA IN THE ARTS
III.—BACTERIA IN THE DAIRY
IV.—BACTERIA IN NATURAL PROCESSES
V.—PARASITIC BACTERIA AND THEIR RELATION TO DISEASE
VI.—METHODS OF COMBATING PARASITIC BACTERIA
THE STORY OF GERM LIFE
CHAPTER I. BACTERIA AS PLANTS
HISTORICAL
WHAT ARE BACTERIA?
FORM OF BACTERIA
RAPIDITY OF MULTIPLICATION
DIFFERENCES BETWEEN DIFFERENT SPECIES OF BACTERIA
SPORE FORMATION
MOTION
INTERNAL STRUCTURE
ANIMALS OR PLANTS?
CLASSIFICATION OF BACTERIA
VARIATION OF BACTERIA
WHERE BACTERIA ARE FOUND
CHAPTER II
MISCELLANEOUS USE OF BACTERIA IN THE ARTS
BENEFITS DERIVED FROM POWERS OF DECOMPOSITION
BENEFITS DERIVED FROM THE PRODUCTS OF BACTERIAL LIFE
BACTERIA IN THE FERMENTATIVE INDUSTRIES
VINEGAR
LACTIC ACID
BUTYRIC ACID
INDIGO PREPARATION
BACTERIA IN TOBACCO CURING
OPIUM
TROUBLESOME FERMENTATIONS
CHAPTER III
RELATION OF BACTERIA TO THE DAIRY INDUSTRY
SOURCES OF BACTERIA IN MILK
THE EFFECT OF BACTERIA ON MILK
BACTERIA IN BUTTER MAKING
USE OF ARTIFICIAL BACTERIA CULTURES FOR CREAM RIPENING
BACTERIA IN CHEESE
CHAPTER IV
BACTERIA IN NATURAL PROCESSES.—AGRICULTURE
BACTERIA AS SCAVENGERS
BACTERIA AS AGENTS IN NATURE'S FOOD CYCLE
RELATION OF BACTERIA TO AGRICULTURE
SPROUTING OF SEEDS
THE SILO
THE FERTILITY OF THE SOIL
BACTERIA AS SOURCES OF TROUBLE TO THE FARMER
CHAPTER V
PARASITIC BACTERIA AND THEIR RELATION TO DISEASE
METHOD BY WHICH BACTERIA PRODUCE DISEASE
PATHOGENIC GERMS WHICH ARE NOT STRICTLY PARASITIC
PATHOGENIC BACTERIA WHICH ARE TRUE PARASITES
WHAT DISEASES ARE DUE TO BACTERIA?
VARIABILITY OF PATHOGENIC POWERS
SUSCEPTIBILITY OF THE INDIVIDUAL
RECOVERY FROM GERM DISEASES
DISEASES CAUSED BY OTHER ORGANISMS THAN BACTERIA
CHAPTER VI
METHODS OF COMBATING PARASITIC BACTERIA
PREVENTIVE MEDICINE
BACTERIA IN SURGERY
PREVENTION IN INOCULATION
LIMITS OF PREVENTIVE MEDICINE
CURATIVE MEDICINE
DRUGS
VIS MEDICATRIX NATURAE
ANTITOXINES
CONCLUSION
Отрывок из книги
H. W. Conn
Published by Good Press, 2021
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In shape bacteria are the simplest conceivable structures. Although there are hundreds of different species, they have only three general forms, which have been aptly compared to billiard balls, lead pencils, and corkscrews. Spheres, rods, and spirals represent all shapes. The spheres may be large or small, and may group themselves in various ways; the rods may be long or short, thick or slender; the spirals may be loosely or tightly coiled, and may have only one or two or may have many coils, and they may be flexible or stiff; but still rods, spheres, and spirals comprise all types.
In size there is some variation, though not very great. All are extremely minute, and never visible to the naked eye. The spheres vary from 0.25 u to 1.5 u (0.000012 to 0.00006 inches). The rods may be no more than 0.3 u in diameter, or may be as wide as 1.5 u to 2.5 u, and in length vary all the way from a length scarcely longer than their diameter to long threads. About the same may be said of the spiral forms. They are decidedly the smallest living organisms which our microscopes have revealed.
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