Biology Commons^™

Drosophila Alcohol Dehydrogenase: Developmental Studies On Cryptic Variant Lines, Gurbachan Miglani, Franklin Ampy

Department of Biology Faculty Publications

Thirty-five cryptic variant lines were used to examine the mechanisms involved in genetic modulation of alcohol metabolism in Drosophila. Late third-instar larval, preemergence pupal, and adult stages cultured at 18 and 28 C were examined. Spectrophotometric analyses for native alcohol dehydrogenase (ADH) activity and residual ADH activity after treatment with guanidine hydrochloride and heat were performed. Differential response of cryptic variants to treatment with the denaturants during development suggested that this variation may have an adaptive significance.

Interpopulation Variation In Calcareous And Proteinaceous Shell Components In The Stream Limpet, Ferrissia Rivularis, Carl M. Way, Daniel J. Hornbach, Albert J. Burky

Biology Faculty Publications

Natural populations of the North American stream limpet, F. rivularis, were studied in upstate New York [USA], in a set of localities whose waters have a 15-fold range of dissolved Ca (4.6-67.6 mg/liter) and also range from oligotrophy to eutrophy. Shell component analyses (CaCO3, total organic C and total N) are reported as component mass-fractions (mg/g or .mu.g/g dry weight) and as values for a standard limpet shell of 35 mm aperture length (AL). More than 2-fold differences occur between populations in all 3 components, with relatively little variation occurring within each population. Expressed per standard limpet, CaCO3 values for …

Seasonal Metabolism Of The Sphaeriid Clam, Musculium Partumeium (Say), From A Permanent And A Temporary Pond, Carl M. Way, Daniel J. Hornbach, Albert J. Burky

Biology Faculty Publications

Seasonal metabolic rates were examined for the sphaeriid clam, Musculium partumeium (Say) from a permanent and a temporary pond. For the fall-born generation from the permanent pond and for the single generation from the temporary pond, metabolic rates peak during periods of greatest growth and reproduction. Metabolic rates were consistently higher for the permanent pond population. These rates for Musculium partumeium extend the available information on the family Sphaeriidae to the genus Musculium.

Growth Of Pisidium Casertanum (Poli) In West Central Ohio, Albert J. Burky, Daniel J. Hornbach, Carl M. Way

Biology Faculty Publications

Clarke (1973) states that Pisidium casertanum (Poli) is perhaps the most common species of Pisidium and is truly cosmopolitan, occurring throughout Eurasia, Africa, Australia, and South, Central and North America. Populations of these clams are reported in habitats ranging from ephemeral ponds to benthic zones of deep lakes. Our study describes Manuscript received 29 May 1979 and in revised form 25 July 1980 (#79-34). 2 Present address: Department of Biology, University of Virginia, Charlottesville, VA 22901. 3 Present address: Department of Zoology, Miami University, Oxford, OH 45056. 41 aspects of the life-cycle of P. casertanum in a spring-fed stream with …

Cytologic Characterization Of Human Constitutive Heterochromatin, Timothy Atchison Donlon

Dissertations and Theses

A study was conducted to cytologically map certain subsets of constitutive heterochromatin onto specific portions of human chromosomes. This involved sequentially staining metaphase chromosomes from lymphocytes first with the Centromeric Dot, Giemsa-11, G-banding or Lateral Asymmetry staining techniques, which are cytochemical methods which stain particular chromosomes or chromosomal regions. Then those same metaphase chromosomes were stained using the C-banding technique, a method which is believed to denote constitutive heterochromatin. With the exception of the G-banding technique, areas depicted by the special staining techniques were found to reside only within the areas stained by the C-band technique and are thus believed …

Review Of "Case Studies In Genetics" By M. A. Tribe, I. Tallan, And M. R. Eraut, John B. Jenkins

Biology Faculty Works

No abstract provided.

Review Of "Introduction To Biometrical Genetics" By K. Mather And J. L. Jinks, John B. Jenkins

Biology Faculty Works

No abstract provided.

Origins Of Biological Thought, John B. Jenkins

Biology Faculty Works

No abstract provided.

Review Of "History Of The Life Sciences. An Annotated Bibliography" By P. Smit, John B. Jenkins

Biology Faculty Works

No abstract provided.

Buoyancy Changes As Related To Respiratory Behavior In An Amphibious Snail, Pomacea Urceus (Müller), From Venezuela, Kathleen A. Burky, Albert J. Burky

Biology Faculty Publications

The ampullariid Pomacea urceus uses its ctenidium and lung in respiration. The snails reach the surface with their siphon and ventilate their lung by withdrawing their head-foot in a pumping action. The lung gas also serves to change the buoyancy of the snails. After a ventilation a snail does not necessarily return to the same buoyancy level. They may achieve overall specific gravities of <1 to > 1 after a ventilation. They may remain submerged (s.g. > 1) or float (s.g.

Bvr-1, A Restriction Locus Of A Type C Rna Virus In The Feline Cellular Genome: Identification, Location, And Phenotypic Characterization In Cat X Mouse Somatic Cell Hybrids, Stephen J. O'Brien

Biology Faculty Articles

Somatic cell hybrids were constructed between BALB/c-RAG mouse cells and feline lymphoma cells by the hypoxanthine-aminopterin-thymidine selection scheme. RAG cells spontaneously produce an endogenous B-tropic type C virus. Cat-mouse hybrids preferentially segregate feline chromosomes and retain murine chromosomes,demonstrable by karyotypic and isozyme analyses. Despite the presence of the complete mouse genome, including the viral genome, virus production was diminished to 1-5% of the levels observed in RAG parents based upon particle-associated RNA-dependent DNA polymerase (reverse transcriptase) activity in the culture fluid. Thirty-seven hybrids made on four different occasions had suppressed virus levels, and no hybrids expressed parental virus levels. Reverse …

"Biological Determinism As A Social Weapon", Richard C. Lewontin

Special Collections: Oregon Public Speakers

No abstract provided.

Eatonia No. 20, May 05, 1975, William L. Peters, Janice Peters

Eatonia

Eatonia was a newsletter established to facilitate communication among scientists working on a group of aquatic insects in the order Ephemeroptera, more commonly known as mayflies. The newsletter is named after Rev. Alfred E. Eaton who studied mayflies in England in the late 1800’s and is considered the “father” of the modern classification of mayflies.

Eatonia Sup. 01, Jan. 05, 1975, William L. Peters, Janice Peters

Eatonia

Eatonia was a newsletter established to facilitate communication among scientists working on a group of aquatic insects in the order Ephemeroptera, more commonly known as mayflies. The newsletter is named after Rev. Alfred E. Eaton who studied mayflies in England in the late 1800’s and is considered the “father” of the modern classification of mayflies.

The Α-Glycerophosphate Cycle In Drosophila Melanogaster Iv. Metabolic, Ultrastructural, And Adaptive Consequences Of Αgpdh-1 "Null" Mutations, Stephen J. O'Brien, Yoshio Shimada

Biology Faculty Articles

"Null" mutations previously isolated at the αGpdh-1 locus of Drosophila melanogaster, because of disruption of the energy-producing α-glycerophosphate cycle, severely restrict the flight ability and relative viability of affected individuals. Two "null" alleles, αGpdh-1^BO-1-4, and αGpdh-1^BO-1-5, when made hemizygous with a deficiency of the αGpdh-1 locus,Df(2L)GdhA, were rendered homozygous by recombination with and selective elimination of the Df(2L)GdhA chromosome. After over 25 generations, a homozygous αGpdh-1^BO-1-4stock regained the ability to fly despite the continued absence of …

Attitudes On Population Crisis At A Small Liberal-Arts College, John B. Jenkins, R. C. Mitchell

Biology Faculty Works

No abstract provided.

The Α-Glycerophosphate Cycle In Drosophila Melanogaster. Iii. Relative Viability Of "Null" Mutants At The Α-Glycerophosphate Dehydrogenase-1 Locus, Stephen J. O'Brien, Bruce Wallace, Ross J. Macintyre

Biology Faculty Articles

No abstract provided.

Spontaneous Mutation Rate In The Dumpy Region Of Drosophila, John B. Jenkins

Biology Faculty Works

No abstract provided.

Molecular Weight Determinations Of Some Salmonella Potsdam Bacteriophage Dna's, Winston H. Richards

Loma Linda University Electronic Theses, Dissertations & Projects

Two group A phages, P9c/2 and P4/2, were studied. Their density, sedimentation velocity, and biochemical properties were compared. Their densities were determined by density gradient centrifugation in 38.3% cesium chloride. Sedimentation velocity was used to determine their molecular weights. To accomplish this, the DNA of P9c/2 and P4/2 was labeled with tritium and T₂ DNA, labeled with ³²P, was used as a standard. The DNA of P9c/2 and P4/2 was separately mixed with T₂ DNA and centrifuged in a 0-15% sucrose gradient. The molecular weights were calculated using the formula D₂/D₁= (M_{2 …}

An Analysis Of Gene-Enzyme Variability In Natural Populations Of Drosophila Melanogaster And D. Simulans, Stephen J. O'Brien, Ross J. Macintyre

Biology Faculty Articles

Nine populations of D. melanogaster and two populations of D. simulans were analyzed for polymorphism in 10 gene-enzyme systems by the technique of gel electrophoresis. In the eight natural populations of D. melanogaster, an average of 54% of the enzymes were polymorphic, and the average heterozygosity was 22.7%. An experimental population of D. melanogaster, which has been maintained in a laboratory cage for 20 years, showed levels of polymorphism equivalent to those of natural populations. The D. simulans populations had much less variability. The possible factors involved in maintaining these polymorphisms are discussed.

Evaluation Of The Short Sternum As Diagnostic Evidence For Trisomy-E, Frank George Deeter

All Master's Theses

This study has demonstrated that a reliable technique for determining short sternums has been developed. Evidence for its reliability is given by two distinct and highly significant correlations.

Biochemical Properties Of Salmonella Potsdam Bacteriophage P4/2, Clyde L. Roggenkamp

Loma Linda University Electronic Theses, Dissertations & Projects

Over 90% recovery of phage P4/2 was realized with differential centrifugation concentration and purification, whereas only about 16% was recovered from the aqueous two-phase polymer - Genetron - ECTEOLA-cellulose column system. Purity of preparations was greatest with the density gradient centrifugation (A₂₆₀ = 2.66 and A₂₈₀ = 1.80 per 10¹² plaque-forming units). With the chemical system of concentration and purification followed by an ECTEOLA anion exchange run, the A₂₆₀ was 6.6 and the A₂₈₀ was 4.3.

Three tests were employed to determine the configuration of P4/2 DNA: (1) a formalin denaturation test, (2) a thermal …

The Webworm. 2. The Biology Of The Webworm, J A. Button

Journal of the Department of Agriculture, Western Australia, Series 4

A detailed knowledge of the seasonal history of an insect pest is essential for an understanding of the way in which it is affected by various management and cultural practices.

A Cytological Study Of The Salivary Gland Chromosomes Of The Attached-X Variety Of Drosophila Melanogaster, Jack Schull

Bachelors’ Theses

The detailed study of -the salivary chromosomes of the Diptera has been of great importance in substantiating cytologically the theories of genetics. A noteworthy example of the importance of cytological study is the non-disjunctive phenomenon which has occurred on at least several occasions in the strain of Drosophila melanogaster. Bridges (1913) was the first to report nondisjunction of sex chromosomes which was an important confirmation of the chromosome theory. L. V. Morgan (1922) used the cytological study of the germ cells of Drosophila melanogaster to prove that there was no disjunction of the sex chromosomes in the attached-X strain.

Heterochromia Iridis From The Genetical Viewpoint, Richard Charles Suehr

Bachelors’ Theses

It is intended in this paper to present the published data obtainable; to report original data; to analize this data; and to try to establish some law of heredity by which the phenomenon of Heterochromia Iridis is transmitted from generation to generation.

A Human Hereditary Trait Appearing In Offspring From A Cousin-Marriage, C. P. Oliver

Journal of the Minnesota Academy of Science

No abstract provided.

Alfred E. Eaton - Father Of Modern Classification Of Mayflies, Late 1800'S, P. Barnard

Eatonia

This is the only known photograph of Rev. Alfred E. Eaton. It is provided by P. Barnard.

The Eatonia newsletter is named after Rev. Alfred E. Eaton who studied mayflies in England in the late 1800’s and is considered the “father” of the modern classification of mayflies.