Tim Yoho's Biographical Page

Brief Bio
PRESENT STATUS: Professor Emeritus of Biology Lock Haven University, Lock Haven, PA 17745. Retired June 2004. Married Judith Keegan in 1981. Have Two stepdaughters and four grandchildren. Live in log home on 5.5 acres in Central PA (near Lock Haven).
EDUCATION: US Army Signal School Ft. Monmouth, NJ 1961; BS Biology Chemistry West Liberty State College WV 1967; PhD Entomology/Biochemistry WVU 1972; NIH Postdoctoral Fellow WVU 1972-74.
MILITARY: US Army 1960-1963; MOS 272.1 Radio Transmitter Repairman; Major Unit 14th PsyWar Battalion (Broadcasting and Visual Activity Pacific) Okinawa 1961-63.
INTERESTS: Insect, Spider, and Tick Physiology and Biochemistry; Developmental Biology; Lyme Disease; Scanning and Transmission Electron Microscopy; Photography; Ham Radio (WA3D); Civil War History and Weapons; General Military History; Cooking; Triumph TR3 Sports Cars; Yoho/Joho Genealogy
Summary of Professional Experience from 1959 to 2004

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Moundsville High School; Moundsville WV 1959 |
Radio Transmitter Repairman: U.S. Army Signal School; Ft.Monmouth NJ 1961 |
BS Biology with Minor in Chemistry: West Liberty State College, WV 1967 |
PhD Insect Physiology and Biochemistry: West Virginia University 1972 |
| National Institutes of Health Post-Doctoral Fellowship WVU 1972-74 |
| |

Academic Employment

Professional Associations (Past and Present)
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American Biology Teachers
- Association of PA State College and University Professors
- Association of PA State College and Retired University Professors
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American Physiological Scoiety
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Committee of Correspondence to Support Theory of Evolution
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Commonwealth of PA University Biologist (CPUB), Vice Presient 1989
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Electron Microscopy Society of America
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Entomological Society of America
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National Center For Science Education
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The American Institute of Biological Sciences
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The Honor Society of Agriculture, Gamma Sigma Delta
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The Research Honor Society of Sigma XI
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The Honor Society of Phi Kappa Phi (President and VP at LHU)
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The Photobiological Society of America
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West Virginia Entomological Society


Publications
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Yoho, T.P., L. Butler, and J.E. Weaver. 1971. Photodynamic Effect of Light on Dye-Fed House Flies: Preliminary Observations of Mortality. J. Econ. Entomol. 64:972-3.
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Yoho, T.P., 1972. The Photodynamic Effect of Light on Dye-Fed House Flies, Musca domesti Disserca.tation Abstracts. Ann Arbor , Mich
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Yoho, T.P., L. Butler, and J.E. Weaver. 1973. Photodynamic Action in Insects. 1. Levels of Mortality in Dye-Fed Light-Exposed House Flies. J. Environ. Entomol. 2:1092-6
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Yoho, T.P., L. Butler, and J.E. Weaver. 1976. Photodynamic Killing of House Flies Fed Food, Drug, and Cosmetic Dye Additives. J. Environ. Entomol. 5:203-204.
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Weaver, J.E., L. Butler, and T.P. Yoho. 1976. Photodynamic Action in Insects: Volumetric Changes in The Hemolymph Crop Contents of Dye- Treated, Light-Exposed Cockroaches. J. Environ. Entomol. 5:840-44.
Unpublished Research
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Yoho, T.P. Photodynamic Action in Insects: Light and Electron Microscope Analysis
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Ibid. Acetylcholinesterase Analysis
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Ibid. Mitochondrial Analysis
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Ibid. Electrophysiological Analysis of Membanes
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Ibid. Monochromatic Light Studies
Significant Citations of Research
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Research Progress on a Broad Front. 1973. Science. 182:1332
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Synthetic Dyes Kill House Flies. 1973. News and Features From The National Institutes of Health. pp. 12-13
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Red Flies in The Sunset. 1973. The Pennsylvania Farmer
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Synthetic Dyes Kill House Flies. 1974. Bioscience. 24:242
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New Swats At Pests. 1974. Science News. 105: 40
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Dye + Light = Death. 1974. Arch. Intern. Med. 133:341
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House Flies Fall Prey To Common Dyes. 1974. Lab. Anim. Jan. pp. 38, 48
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Feingold, B.F. 1975. Why Your Child is Hyperactive. The Story of Food Colors. Random House, N.Y. pp 118-20
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Effects of Erythrosin B on Hemocytes of the American Cockroach. 1982. J. Environ. Entomol. 11:463-66
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Light-Activated Pesticides. 1986. ACS Symposium Series

Community and Other Associations (Past & Present)
- Amateur Radio Relay League (ARRL)
- Bald Eagle Amateur Radio Club
- Clinton County SPCA Board Member
- Psychological Operations Veterans Association (POVA)
- Radio Amateur Civil Emergency Services (RACES)
- Western PA Triumph Association
Basic Biology BIOL101
Introductory Information:
- Catalog No.: BIOL101
- Course Title: Basic Biology
- Clock Hours Per Week: 4 (2 lectures/1 lab)
- Credit: 3 Semester Hours
- Department: Biological Sciences
- Prerequisites: None. This course will satisfy a General Education Science Laboratory Requirement.
Description of Course:
A study of basic truths and concepts at the cellular, organismal, and population levels with emphasis upon cellular, ecological and genetic aspects of biology. Concepts covered include: the origin of life, cell structure and function, the nature and implications of plant and animal associations, food chains, ecological successions, natural selection, and the population explosion. The nature of hereditary transmission, Mendelian concepts and modern genetics are also discussed. Laboratory exercises are designed to promote inductive and deductive reasoning in scientific thought.

Developmental Biology BIOL302
I. Introductory Information:
- Catalog No.: BIOL302
- Course Title: Developmental Biology
- Clock Hours Per Week: 5
- Credit: 3 Semester Hours
- Department: Biological Sciences
- Prerequisites: Genetics Biol202 or Permission of Instructor
II. Description of Course:
Much more than classic embryology, developmental biology is a study of processes producing structural and functional changes in molecules, cells, tissues, and organs during developmental cycles of plants and animals.
Four component aspects of development will be considered on the organismal, cellular, and molecular levels: determination, differentiation, growth, and morphogenesis.
Subject matter will include relevant findisngs in cytogenetics, cell and molecular biology, biochemistry, and embryology.
C. Major Units and Time Allotted:
Topic:
1. Introduction (1 class period)
- Scope of developmental biology
- Basic definitions
- Early theories and experimental embryology
2. Gametogenesis (4 class periods)
- Proliferation: Mitosis and Cytokinesis
- Spermatogenesis: Meiosis and Spermiogenesis
- Oogenesis: Meiosis and Maturation
3. Fertilization (4 class periods)
- Fertilizin and antifertilizin reaction
- Sperm and egg recognition
- Sperm penetration
- Cortical granule reaction and membrane polarity change
- Cytoplasmic pH changes and activation process
- Parthenogenesis
4. Embryogenesis (8 class periods)
- Cleavage
- patterns
- blastula formation and types of blastulae
- Gastrulation
- fate maps and germinal tissue
- morphogenetic movements and types of gastrulae
5. Molecular and genetic basis of development (7 class periods)
- Chromosome structure and gene function
- histone and nonhistone acid proteins
- heterochromatic and euchromatic states
- Gene function in gametogenesis, cleavage, and blastulation
- lampbrush chromosomes
- masked messenger hypothesis
- cytoplasmic influence or determinants
- Gene function in gastrulation and organogenesis
- the homeobox, homeodomain proteins, determination and differentiation
6. Organogenesis (4 class periods)
- Tissue interactions and induction
- Development of organs derived from ectoderm
- Development of organs derived from mesoderm
- Development of organs derived from endoderm

EntomologyCourse Description
This 3 s.h. course is a broadly balanced introduction to the insect world including structure and function, taxonomy, life cycles, habits, reproduction and development, disease relationships, and agricultural importance. Students are expected to collect, identify, and label insects for a required insect collection. The collection will consist of a minimum of 60 Families in 15 Orders. There are two 50 minute lectures and one two hour 50 min lab per week. Course is offered every other even year. Developmental Biology alternates in odd years.
Textbook: Insects by Borror, Triplehorn, and Johnson. 1989. Saunders Publishing.
Labbook: Entomology Lab Manual: The Bug Mug Book by Yoho, T.P. Updated periodically
SYLLABUS
I. Introductory Information
- Catalog No.: BS 413
- Course Title: Entomology
- Clock Hours per Week: 5
- Credit: 3 Semester Hours
- Department: Biological Sciences
- Prerequisites: Six semester hours of biology or permission of Instructor.
II. Description of Course
Entomology is a study of a very specific group of organisms,the insects, which far outnumber all other species of life on earth.
The approach to this vast field of investigation will be in the manner of a broad balanced introduction developed around 3 major concepts:
- Structure and Function which includes pertinent topics in external and internal anatomy and morphology as well as physiology.
- Unity and Diversity which embraces aspects of evolution, systematics and a survey of insect life cycles and habits, including types of reproduction and development.
- Applied aspects of Entomology which will consider how some insects are problems in terms of agricultural loses and disease relationships to man and domesticated animals.
C. Major Course Units and Time Allotted:
l. Introduction (l class period)
- The Scope of Entomology
- History
- Fields of Study
- Importance to Man
2. Phylum Arthropoda (l class period)
- General characteristics
- Evolutionary relationships
- Characteristics of Classes
- Subdivision Chelicerata
- Subdivision Manibulata
3. Class Insecta: External Morphology
- The Integumentary System (1 class period)
- Basic components
- Sclerotization
- External Integumentary Processes
- Molting and Ecdysis
- The Head (l class period)
- Sclerites and Sutures
- Compound eyes, Ocelli, and Stemmata
- Antennal types
- Mouthpart types
- Tentorium
- The Thorax (2 class periods)
- Sclerites and Sutures of Nota, Pleura and Sterna
- Types of Thoraces Leg attachment and types of legs
- Wing attachment and types of wings
- The Abdomen (l class period)
- Sclerites and sutures of Terga, Pleura and Sterna
- Nongenital abdominal appendages External genitalia
4. Internal Anatomy and Physiology
- The Alimentary System (2 class periods)
- Generalized digestive system
- Diet related adaptations
- Salivary glands
- Malpighian tubules and excretion
- Digestion and absorption
- Mutualistic organisms
- The circulatory System (l class period)
- Hemolymph and Hemocytes
- Protection
- Storage and transport
- Hydraulic mechanism
- The dorsal vessel and accessory pumping devices
- The ventilatory System (l class period)
- Tracheae and Tracheoles
- Air sacs
- Spiracles
- Aquatic mechanisms
- The Nervous System (l class period)
- Central Nervous System
- Visceral or Sympathetic Nervous System
- Sense receptors
- The Endocrine System (l class period)
- Brain or neurosecretory hormones
- Corpora cardiaca
- Corpora allata
- Prothoracic gland
- Moulting and ecdysis
5. Reproduction and Morphogenesis (2 class periods)
- Ovaries, ovarioles and accessory structures
- Testes and accessory structures
- Sex determination and parthenogenesis
- Metamorphosis
- Ametabolous
- Anamorphosis
- Paurometabolous
- Hemimetabolous
- Hypermetamorphosis
- Larval types Pupal types
6. Systematics (l class period)
- Purpose of Identification
- Methods and Problems Encountered in Identification International Code of Zoological Nomenclature
- Type concept Taxonomic categories
7. Survey of Class Insecta (9 class periods)
Habitat, life history, specific characteristics, economic and medical importance of the following groups:
- Order Protura
- Order Collembola
- Order Thysanura
- Order Diplura
- Order Ephemeroptera
- Order Odonata
- Order Plecoptera
- Order Dermaptera
- Order Isoptera
- Order Embioptera
- Order Zoraptera
- Order Psocoptera
- Order Mallophaga
- Order Anoplura
- Order Thysanoptera
- Order Hemiptera
- Order Homoptera
- Order Neuroptera
- Order Mecoptera
- Order Trichoptera
- Order Lepidoptera
- Order Diptera
- Order Coeloptera
- Order Siphonaptera
- Order Strepsiptera
- Order Hymenoptera
8. Applied Entomology (3 class periods)
- Agricultural pests
- Lawn and ornamental pests
- Stored products, household and structural materials
- Insects as causative agents of disease and discomfort
- Biological Control
- Environmental Control
- Chemical Control
- Mechanical and Physical Control

Organismal Physiology BIOL410
I. Introductory Information:
- Catalog No.: BIOL4l0
- Course Title: Organismal Physiology
- Clock Hours Per Week: 5
- Credit: 3 Semester Hours
- Department: Biological Sciences
- Prerequisites:
II. Description of Course:
Organismal Physiology is designed in part as a capstone course utilizing concepts learned in previous science courses. The course is intended to take the student above the cellular level in functional biology by using chemical, cellular and molecular concepts as a basis for the discussion of higher level functions.
The theme of the course is homeostasis or the physiology of compensation for environmental change. The responses to external stimuli and the manner in which organisms compensate is discussed in relation to energy needs, thermoregulation, osmoregulation, movement, hemoregulation including blood buffering, and information processing including neural and hormonal systems. Although animal physiology is stressed, some examples of protistian and plant physiology are used.
C. Major Units and Time Allotted:
Topic:
1. Introduction to Organismal Physiology (1 class period)
2. Bioenergetics: Food and Energy Requirements (6 class periods)
- Energy and work in living organisms
- Thermodynamics and life
- Energy extraction: Autotrophs and Heterotrophs
- Energy transformations in organisms
- Energy needs of organisms: BMR/SMR/FMR
- Energy needs of organisms: Thermoregulation/Body Size
3. Osmoregulation: Water and Solute Regulation (7 class periods)
- Diffusion and osmosis: Methods and validity of measurement
- Osmoregulators and osmoconformers
- Organs of osmoregulation in a variety of organisms
- Function of kidneys in conservation, excretion and blood buffering
- The renin angiotensin mechanism of salt and water regulation
4. Movement of Organisms (7 class periods)
- Methods of organism movement
- Structural types of muscle and their purpose
- The sliding filament theory of muscle movement
- The electrical and molecular theories of muscle movement
- The function of the heart in hemoregulation
5. Information Processing (7 class periods)
- Irritability of cells and organisms
- The origin and purpose of resting potentials of cells
- Types and structure of the nervous system
- Organism receptor mechanisms
- Information coding
- Neural and synaptic transmission
- Responses of the organism
- Hormones and chemical regulation of the cell and organism
6. Unit Exams (2 class periods)