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The article contains sections titled: 1. Introduction to the Field of Sensors and Actuators 2. Chemical Sensors 2.1. Introduction 2.2. Molecular Recognition Processes and Corresponding Selectivities 2.2.1. Catalytic Processes in Calorimetric Devices 2.2.2. Reactions at Semiconductor Surfaces and Interfaces Influencing Surface or Bulk Conductivities 2.2.3. Selective Ion Conductivities in Solid‐State Materials 2.2.4. Selective Adsorption ‐ Distribution and Supramolecular Chemistry at Interfaces 2.2.5. Selective Charge‐Transfer Processes at Ion‐Selective Electrodes (Potentiometry) 2.2.6. Selective Electrochemical Reactions at Working Electrodes (Voltammetry and Amperometry) 2.2.7. Molecular Recognition Processes Based on Molecular Biological Principles 2.3. Transducers for Molecular Recognition: Processes and Sensitivities 2.3.1. Electrochemical Sensors 2.3.1.1. Self‐Indicating Potentiometric Electrodes 2.3.1.2. Voltammetric and Amperometric Cells 2.3.1.3. Conductance Devices 2.3.1.4. Ion‐Selective Field‐Effect Transistors (ISFETs) 2.3.2. Optical Sensors 2.3.2.1. Fiber‐Optical Sensors 2.3.2.2. Integrated Optical Chemical and Biochemical Sensors 2.3.2.3. Surface Plasmon Resonance 2.3.2.4. Reflectometric Interference Spectroscopy 2.3.3. Mass‐Sensitive Devices 2.3.3.1. Introduction 2.3.3.2. Fundamental Principles and Basic Types of Transducers 2.3.3.3. Theoretical Background 2.3.3.4. Technical Considerations 2.3.3.5. Specific Applications 2.3.3.6. Conclusions and Outlook 2.3.4. Calorimetric Devices 2.4. Problems Associated with Chemical Sensors 2.5. Multisensor Arrays, Electronic Noses, and Tongues 3. Biochemical Sensors (Biosensors) 3.1. Definitions, General Construction, and Classification 3.2. Biocatalytic (Metabolic) Sensors 3.2.1. Monoenzyme Sensors 3.2.2. Multienzyme Sensors 3.2.3. Enzyme Sensors for Inhibitors ‐ Toxic Effect Sensors 3.2.4. Biosensors Utilizing Intact Biological Receptors 3.3. Affinity Sensors ‐ Immuno‐Probes 3.3.1. Direct‐Sensing Immuno‐Probes without Marker Molecules 3.3.2. Indirect‐Sensing Immuno‐Probes using Marker Molecules 3.4. Whole‐Cell Biosensors 3.5. Problems and Future Prospects 4. Actuators and Instrumentation 5. Future Trends and Outlook
The article contains sections titled: 1. Introduction to the Field of Sensors and Actuators 2. Chemical Sensors 2.1. Introduction 2.2. Molecular Recognition Processes and Corresponding Selectivities 2.2.1. Catalytic Processes in Calorimetric Devices 2.2.2. Reactions at Semiconductor Surfaces and Interfaces Influencing Surface or Bulk Conductivities 2.2.3. Selective Ion Conductivities in Solid‐State Materials 2.2.4. Selective Adsorption ‐ Distribution and Supramolecular Chemistry at Interfaces 2.2.5. Selective Charge‐Transfer Processes at Ion‐Selective Electrodes (Potentiometry) 2.2.6. Selective Electrochemical Reactions at Working Electrodes (Voltammetry and Amperometry) 2.2.7. Molecular Recognition Processes Based on Molecular Biological Principles 2.3. Transducers for Molecular Recognition: Processes and Sensitivities 2.3.1. Electrochemical Sensors 2.3.1.1. Self‐Indicating Potentiometric Electrodes 2.3.1.2. Voltammetric and Amperometric Cells 2.3.1.3. Conductance Devices 2.3.1.4. Ion‐Selective Field‐Effect Transistors (ISFETs) 2.3.2. Optical Sensors 2.3.2.1. Fiber‐Optical Sensors 2.3.2.2. Integrated Optical Chemical and Biochemical Sensors 2.3.2.3. Surface Plasmon Resonance 2.3.2.4. Reflectometric Interference Spectroscopy 2.3.3. Mass‐Sensitive Devices 2.3.3.1. Introduction 2.3.3.2. Fundamental Principles and Basic Types of Transducers 2.3.3.3. Theoretical Background 2.3.3.4. Technical Considerations 2.3.3.5. Specific Applications 2.3.3.6. Conclusions and Outlook 2.3.4. Calorimetric Devices 2.4. Problems Associated with Chemical Sensors 2.5. Multisensor Arrays, Electronic Noses, and Tongues 3. Biochemical Sensors (Biosensors) 3.1. Definitions, General Construction, and Classification 3.2. Biocatalytic (Metabolic) Sensors 3.2.1. Monoenzyme Sensors 3.2.2. Multienzyme Sensors 3.2.3. Enzyme Sensors for Inhibitors ‐ Toxic Effect Sensors 3.2.4. Biosensors Utilizing Intact Biological Receptors 3.3. Affinity Sensors ‐ Immuno‐Probes 3.3.1. Direct‐Sensing Immuno‐Probes without Marker Molecules 3.3.2. Indirect‐Sensing Immuno‐Probes using Marker Molecules 3.4. Whole‐Cell Biosensors 3.5. Problems and Future Prospects 4. Actuators and Instrumentation 5. Future Trends and Outlook
Sixty-nine Caucasian males without a previous history of urethritis and who developed nongonococcal urethritis (NGU) and 39 similar men without urethritis (NU) were cultured from the urethra for Chlamydia trachomatis, Mycoplasma hominis, Ureaplasma urealyticum, aerobes, and anaerobes. C. trachomatis infection was proven by culture of serology in 26 (38%) of the NGU group and 1 (3%) of the NU group; the C. trachomatis-negative NGU group had significantly more U. urealyticum (81%) than the C. trachomatis-positive NGU group (42%) or the NU group (59%). Aerobes were isolated from significantly more NU men (91%) than from men with NGU (66%). The aerobic and anaerobic flora of the two NGU groups were similar. The NU group had significantly more aerobic lactobacilli. Haemophilus vaginalis, alpha-hemolytic streptococci (not Streptococcus faecalis), and anaerobes, predominantly Bacteroides species. This study has provided information about the prevalence and the variety of the aerobic and anaerobic microbiological flora of the anterior urethra of sexually active males. It does not implicate any bacteria other than C. trachomatis and U. urealyticum as potential causes of NGU.
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