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Initiation Of Terpenoid Synthesis In Osmophores Of Stanhopea Anfracta (Orchidaceae): A Cytochemical Study, Kenneth J. Curry Sep 1987

Initiation Of Terpenoid Synthesis In Osmophores Of Stanhopea Anfracta (Orchidaceae): A Cytochemical Study, Kenneth J. Curry

Faculty Publications

The terpenoid component of the osmophore fragrance in Stanhopea species is composed of isoprene units synthesized via the mevalonic acid pathway. Localization of hydroxymethylglutaryl CoA synthase in the pathway was achieved using a technique which elicits the formation of an electron- dense precipitate of uranyl ferrocyanide at the point where an acetyl group from acetyl CoA is transferred to acetoacetyl CoA, releasing free CoA-SH. Applying this technique to cells of the osmophore of S. anfracta resulted in a precipitate between the inner and outer mitochondrial membranes, in the smooth endoplasmic reticulum, and, to a lesser extent, on the outer surface …

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Osmophores Of Stanhopea (Orchidaeceae), William Louis Stern, Kenneth J. Curry, Alec M. Pridgeon Sep 1987

Osmophores Of Stanhopea (Orchidaeceae), William Louis Stern, Kenneth J. Curry, Alec M. Pridgeon

Faculty Publications

Species of the Neotropical orchid genus Stanhopea produce a fragrance comprising terpenoids and aromatics which attracts euglossine bee pollinators. The secretory tissue, called an osmo- phore, is located in the adaxial region of a sac formed near the proximal portion of the floral lip. This region is easily recognized in Stanhopea oculata and S. wardii because it is papillate. The osmophore in these two species includes all the cells of the papillae and those directly below, that grade into fundamental tissue. Osmophore cells are more densely cytoplasmic than cells in the adjacent tissue. Numerous amyloplasts and mitochondria are seen in …

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Aurealcaulis Crossii Gen. Et Sp. Nov., An Arborescent, Osmundaceous Trunk From The Fort Union Formation (Paleocene), Wyoming, William D. Tidwell, Lee R. Parker Jun 1987

Aurealcaulis Crossii Gen. Et Sp. Nov., An Arborescent, Osmundaceous Trunk From The Fort Union Formation (Paleocene), Wyoming, William D. Tidwell, Lee R. Parker

Faculty Publications

Aurealcaulis crossii gen. et sp. nov., is based on permineralized trunks of an osmundaceous tree fern from the Paleocene Fort Union Formation from near Bitter Creek Station of southwestern Wyoming. This new species is characterized by centripetal (exarch) development of its xylem strands which form part of the leaf traces. Most of the leaf traces depart the stele as two segments that fuse into a single C-shaped petiole vascular strand outside of the outer cortex. Stipular expansions of the petiole bases of this species lack sclerenchyma, and roots arise from the lateral edges of leaf traces in the inner cortex. …

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Effect Of Phosphate On The Kinetics And Specificity Of Glycation Of Protein, Nancy G. Watkins, Carolyn I. Neglia-Fisher, Daniel G. Dyer, Suzanne R. Thorpe, John W. Baynes May 1987

Effect Of Phosphate On The Kinetics And Specificity Of Glycation Of Protein, Nancy G. Watkins, Carolyn I. Neglia-Fisher, Daniel G. Dyer, Suzanne R. Thorpe, John W. Baynes

Faculty Publications

The glycation (nonenzymatic glycosylation) of several proteins was studied in various buffiner os rder to assess the effects of buffering ions on the kinetics and specificity of glycation of protein. Incubation of RNase with glucose in phosphate buffer resulted in inactivation of the enzyme because of preferential modification of lysine residues ino r near the activsei te. In contrast, in the cationic buffers, 3-(N-morpholino)propanesulfonic acid and 3-(N-tris(hydroxymethyl)rnethylamino)- 2-hydroxypropanesulfonica cid, the kineticso f glycation of RNase were decreased 2- to 3-fold, there was a decrease in glycation of active site versus peripheral lysines, and the enzyme was resistant to inactivation by …

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Forest Insect Hazard Rating, Ray R. Hicks Jr., Jack E. Coster, G.N. Mason Jan 1987

Forest Insect Hazard Rating, Ray R. Hicks Jr., Jack E. Coster, G.N. Mason

Faculty Publications

No abstract provided.

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Spoil Banks: Effects On A Coastal Marsh Water-Level Regime, Erick M. Swenson, R. Eugene Turner Jan 1987

Spoil Banks: Effects On A Coastal Marsh Water-Level Regime, Erick M. Swenson, R. Eugene Turner

Faculty Publications

Above- and below-ground water-level fluctuations were measured in the marshes south of New Orleans, Louisiana, between November 1982 and December 1983. The purpose of the program was to defme the basic marsh water-level regime and to investigate how canal spoil banks may influence the water-level regime. Two study areas were used: (1) a control area, defined as a section of marsh with unrestricted hydrologic connection to an adjacent bayou; and, (2) a partially-impounded area, defined as an area with limited hydrologic connection to an adjacent bayou due to the presence of dredged canal spoil banks. Data sources included marsh water …

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Structure And Expression Of The Saccharomyces Cerevisiae Cry1 Gene: A Highly Conserved Ribosomal Protein Gene, J. C. Larkin, J. R. Thompson, J. L. Woolford Jan 1987

Structure And Expression Of The Saccharomyces Cerevisiae Cry1 Gene: A Highly Conserved Ribosomal Protein Gene, J. C. Larkin, J. R. Thompson, J. L. Woolford

Faculty Publications

No abstract provided.

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Effect Of Seasonal Changes In Leydig Cell Number On The Volume Of Smooth Endoplasmic Reticulum In Leydig Cells And Intratesticular Testosterone Content In Stallions, L. Johnson, D. L. Thompson Jan 1987

Effect Of Seasonal Changes In Leydig Cell Number On The Volume Of Smooth Endoplasmic Reticulum In Leydig Cells And Intratesticular Testosterone Content In Stallions, L. Johnson, D. L. Thompson

Faculty Publications

Testes from 47 adult (4-20 years) stallions obtained in November-January (non-breeding season) and 41 adult stallions obtained in May-July (breeding season) were perfused with glutaraldehyde, placed in osmium and embedded in Epon 812. Percentage Leydig cell cytoplasm or nuclei in the testis was determined by point counting of 0.5 μm sections under bright-field microscopy. Testes from 6 randomly selected horses per season were processed for electron microscopy. The volume (ml) of SER/testis was calculated from the % SER in the cytoplasm % Leydig cell cytoplasm, and parenchymal volume. Number of Leydig cells was calculated from the % nuclei, parenchymal volume, …

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Protein‐Structural Heterogeneity In A Non‐Allosteric Monomeric Insect Hemoglobin Monitored By Proton Magnetic Resonance Spectroscopy, David H. Peyton, R. Krishnamoorthi, Gerd N. La Mar, Klaus Gersonde, Kevin M. Smith, Daniel W. Parish Jan 1987

Protein‐Structural Heterogeneity In A Non‐Allosteric Monomeric Insect Hemoglobin Monitored By Proton Magnetic Resonance Spectroscopy, David H. Peyton, R. Krishnamoorthi, Gerd N. La Mar, Klaus Gersonde, Kevin M. Smith, Daniel W. Parish

Faculty Publications

Proton NMR has revealed two modes of structural heterogeneity in the monomeric hemoglobin I of Chironomus thummi thummi, CTT I; rotational disorder caused by a 180° rotation of the heme about the α, γ‐meso axis (primary heterogeneity), which varies for each preparation or reconstitution of this hemogobin, and a ‘silent’ amino acid replacement [Thr/Ala exchange in position 98(FG4)] in the vicinity of the heme group, which is invariant under all experimental conditions. The heme rotational disorder (primary heterogeneity) can be removed by reconstitution of CTT I with the symmetrical protoheme III. The secondary splitting is not affected; the ratio of …

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Mechanism Of Attachment Of Swarm Cells Of Thiothrix Nivea., J. M. Larkin, R. Nelson Jan 1987

Mechanism Of Attachment Of Swarm Cells Of Thiothrix Nivea., J. M. Larkin, R. Nelson

Faculty Publications

Swarm cells of Thiothrix nivea were found to possess a group of fimbriae at one pole. The other pole either was bare or possessed from one to three fimbriae. By using this polarity as a marker, it was found that the initial step in attachment of swarm cells involves the fimbriated pole and that this initial step is followed by the production of holdfast material.

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Sepik River Societies: A Historic Ethnography Of The Chambri And Their Neighbors By Deborah B. Gewertz, John W. Adams Jan 1987

Sepik River Societies: A Historic Ethnography Of The Chambri And Their Neighbors By Deborah B. Gewertz, John W. Adams

Faculty Publications

No abstract provided.

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The Chernobyl Accident: A Case Study In International Law Regulating State Responsibility For Transboundary Nuclear Pollution, Linda A. Malone Jan 1987

The Chernobyl Accident: A Case Study In International Law Regulating State Responsibility For Transboundary Nuclear Pollution, Linda A. Malone

Faculty Publications

No abstract provided.

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The Search For Caring And Justice: The Social Functions Of Medicine And Law, Larry I. Palmer Jan 1987

The Search For Caring And Justice: The Social Functions Of Medicine And Law, Larry I. Palmer

Faculty Publications

No abstract provided.

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Active Immunization Of Intact Mares Against Gonadotropin-Releasing Hormone: Differential Effects On Secretion Of Luteinizing Hormone And Follicle-Stimulating Hormone, F. Garza, D. L. Thompson, D. D. French, J. J. Wiest, R. L. St George, K. B. Ashley, L. S. Jones, P. S. Mitchell, D. R. Mcneill Dec 1986

Active Immunization Of Intact Mares Against Gonadotropin-Releasing Hormone: Differential Effects On Secretion Of Luteinizing Hormone And Follicle-Stimulating Hormone, F. Garza, D. L. Thompson, D. D. French, J. J. Wiest, R. L. St George, K. B. Ashley, L. S. Jones, P. S. Mitchell, D. R. Mcneill

Faculty Publications

No abstract provided.

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Pinuxylon Woolardii Sp. Nov., A New Petrified Taxon Of Pinaceae From The Miocene Basalts Of Eastern Oregon, William D. Tidwell, Lee R. Parker, Vaughn K. Folkman Nov 1986

Pinuxylon Woolardii Sp. Nov., A New Petrified Taxon Of Pinaceae From The Miocene Basalts Of Eastern Oregon, William D. Tidwell, Lee R. Parker, Vaughn K. Folkman

Faculty Publications

Specimens of the new species Pinuxylon wollardii have been collected from Miocene strata near Kurkee, OR. These petrified specimens are unique in that, due to weathering, individual tracheids and ray cells can be separated for detailed SEM studies. This species is characterized by its high number of ray cells; numerous rays; large resin ducts which are commonly paired; primarily uniseriate pitting, two to five (usually three) small, oval or cirular pinoid pits per crossfield; and smooth walls on its transverse (ray) tracheids. The latter character relates this species to taxa in the subgenus Haploxylon of Pinus. Pinuxylon woolardii is most …

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Sequence Alignment With Matched Sections, Jerrold R. Griggs, Philip J. Hanlon, Michael S. Waterman Oct 1986

Sequence Alignment With Matched Sections, Jerrold R. Griggs, Philip J. Hanlon, Michael S. Waterman

Faculty Publications

In molecular biology, two finite sequences are compared by displaying one sequence written over another in an alignment. The number of alignments of two sequences is related to the Stanton-Cowan numbers. This paper gives asymptotics for the number of alignments of two sequences of length n with matching sections of size at least b.

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Water-Cover Influences On Diatom Ingestion Rates By Meiobenthic Copepods, Alan W. Decho Oct 1986

Water-Cover Influences On Diatom Ingestion Rates By Meiobenthic Copepods, Alan W. Decho

Faculty Publications

Laboratory experiments on meiobenthic copepods using 14C-diatoms were conducted to investigate whether: (1) feeding rates or (2) food sources (planktonically-suspended foods or benthic sediment-associated foods) vary in response to the presence or absence of water-cover (i.e. simulated Higher-water vs Low-water conditions). Three diatom-feeding harpacticoids were examined. Scottolana canadensis feeds at significantly higher rates (2x) during Higher-water (HW) conditions (P<0.001), at which time it consumes planktonic foods; during Low-water (LW), feeding is greatly reduced. These feeding patterns are related to its burrow-dwelling and to its subtidal habitat. Cletocamptus deitersi remains virtually unaffected by changes in ambient water-cover, feeding at nearly equal rates during HW and LW conditions but always tending to consume more benthic diatoms. Microarthridion littorale consumes food at nearly equal rates during HW and LW …

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The Effect Of Salt Concentration On Auxin Stability In Culture Media, James R. Dunlap, Stephen Kresovich, Robert E. Mcgee Jul 1986

The Effect Of Salt Concentration On Auxin Stability In Culture Media, James R. Dunlap, Stephen Kresovich, Robert E. Mcgee

Faculty Publications

The concentrations of indole-3-acetic acid (IAA), naphthaleneacetic acid (NAA) and 2,4-dichlorophenoxyacetic acid (2,4-D) were followed for 35 days in cell-free liquid medium containing 100, 50, or 0% Murashige-Skoog (MS) salt base. Although the concentrations of NAA or 2,4-D remained constant the level of IAA decreased to only 11% of the original concentration after 35 days in the presence of 100% MS salt base. The observed rate of IAA degradation was accelerated by the presence of MS salts.

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Identification Of Fibroblasts As A Major Site Of Albumin Catabolism In Peripheral Tissues, Jeffrey L. Strobel, Susan G. Cady, Thomas K. Borg, Louis Terracio, John W. Baynes, Suzanne R. Thorpe Jun 1986

Identification Of Fibroblasts As A Major Site Of Albumin Catabolism In Peripheral Tissues, Jeffrey L. Strobel, Susan G. Cady, Thomas K. Borg, Louis Terracio, John W. Baynes, Suzanne R. Thorpe

Faculty Publications

Rat serum albumin has been labeledw ith dilactitollZ5I- tyramine,( 12‘I-DLT) a radioactive tracer which remains entrappedw ithin lysosomes following cellular uptake and degradation of the carrier protein. Similar kinetics of clearance from the rat circulation were observed for albumin labeled conventionally with lZsI or 12‘I-DLT-albumin, both proteinhsa ving circulating half-lives of -2.2 days. In contrast, the recovery of whole body radioactivity had half-lives of -2.2 and 5.1 days, respectively, for the two protein preparations, indicating substantial retention of degradation products derived from catabolism of ”‘I-DLT-albumin. Measurement of total and acid-soluble radioactivity in tissues 2 or 4 days after injection of …

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Identification Of N Epsilon-Carboxymethyllysine As A Degradation Product Of Fructoselysine In Glycated Protein, Mahtab U. Ahmed, Suzanne R. Thorpe, John W. Baynes Apr 1986

Identification Of N Epsilon-Carboxymethyllysine As A Degradation Product Of Fructoselysine In Glycated Protein, Mahtab U. Ahmed, Suzanne R. Thorpe, John W. Baynes

Faculty Publications

The chemistry of Maillard or browning reactionosf glycated proteins was studied using the model compound, Nu-formyl-W-fructoselysine(f FL), an analog of glycated lysine residues in protein. Incubation of fFL (15 mM) at physiological pH and temperature in 0.2 M phosphate buffer resulted in formation of lVcarboxymethyllysine (CML) in about 40% yield after 15 days. CML was formed by oxidative cleavage of fFL between C-2 and C-3 of the carbohydrate chain and erythronic acid (EA) was identified a s , the split product formed in the reaction. Neither CML nor EA was formed from fFL under a nitrogen atmosphere. The rate of …

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Quantifying Spatial Patterns Of Overgrowth In Epibenthic Communities, David S. Wethey, Linda J. Walters Mar 1986

Quantifying Spatial Patterns Of Overgrowth In Epibenthic Communities, David S. Wethey, Linda J. Walters

Faculty Publications

A method is presented that allows rapid and accurate measurement of changes in the spatial pattern of space occupation in encrusting organisms. The boundaries of organisms are represented as polygons, and geometric difference calculations are used to establish the perimeters of the areas gained or vacated between sampling dates. The influence of interspecific interactions on occupation of space is also quantified: geometric intersection calculations are used to define the perimeters of the areas gained or lost in overgrowth interactions. A method is presented for estimating the sampling frequency necessary for detection of significant changes in occupation of space. The method …

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The Msu Student Chapter, Society Of American Foresters, Steven H. Bullard Jan 1986

The Msu Student Chapter, Society Of American Foresters, Steven H. Bullard

Faculty Publications

Forestry students at Mississippi State are encouraged to participate in organizations that strengthen their sense of professionalism and point them toward continued development after graduation. The Student Chapter of the Society of American Foresters is one of those organizations. Forestry students who take part in its activities are aided in developing communication and leadership skills that are difficult to learn in a classroom. Forestry is not just trees. Forestry students deal with the biology of the forest and the economics of timber. They learn how to use these tools to achieve a forest landowner's objectives. Foresters not only make decisions-they …

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Limnological Aspects Of Upland Island: A Wilderness Area In East Texas, J. A. Sidnell, C W. Reed, J. D. Mccullough Jan 1986

Limnological Aspects Of Upland Island: A Wilderness Area In East Texas, J. A. Sidnell, C W. Reed, J. D. Mccullough

Faculty Publications

No abstract provided.

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Management Of Plant Communities In Wilderness Areas, J. D. Mccullough Jan 1986

Management Of Plant Communities In Wilderness Areas, J. D. Mccullough

Faculty Publications

No abstract provided.

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Floristic Composition And Management Of East Texas Pitcher Plant Bogs, E. S. Nixon, J. R. Ward Jan 1986

Floristic Composition And Management Of East Texas Pitcher Plant Bogs, E. S. Nixon, J. R. Ward

Faculty Publications

No abstract provided.

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External Factors Shaping The 2010 Forester: Continuing Education From An Academic Point Of View, Thomas J. Straka, Steven H. Bullard Jan 1986

External Factors Shaping The 2010 Forester: Continuing Education From An Academic Point Of View, Thomas J. Straka, Steven H. Bullard

Faculty Publications

Professional obsolescence is a danger facing all foresters. All too many foreste·rs consider their educational commitment to terminate when they earn their degree. The competency of the professional forester can quickly erode if the forester does not develop a personal continuing education program.

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Continuing Education Needs Of Natural Resource Professionals, Steven H. Bullard, Thomas J. Straka Jan 1986

Continuing Education Needs Of Natural Resource Professionals, Steven H. Bullard, Thomas J. Straka

Faculty Publications

New products, technology and changing social attitudes have created continuing education needs in many natural resource-related professions. Environmental educations rapidly become obsolete without continued study, and many professional organizations are addressing this problem. Causes of professional obsolescence· are briefly reviewed with emphasis on natural resource managers. Foresters' needs and continuing education efforts are discussed to illustrate continuing education concepts in an environmental and natural resource-related profession.

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Potential Reasons For Publicly Funded Forestry Research, Steven H. Bullard Jan 1986

Potential Reasons For Publicly Funded Forestry Research, Steven H. Bullard

Faculty Publications

The general rationale for public support of research and specific reasons for support of particular research areas are of potential concern to many people. Those directly concerned with research ·funding and its rationale, for example, range from legislators to research administrators, scientists and graduate students. Public support of specific research areas is often defended for socio~polit~ ical and economic reasons. As an example, although private-sector research in forestry is conducted by large, diversified firms, the benefits of even highly applied research can be difficult to capture. Public support is necessary in such cases, since social benefits exceed the benefits considered …

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Rates Of Return On Silvicultural Practices, Steven H. Bullard, Bobb L. Karr Jan 1986

Rates Of Return On Silvicultural Practices, Steven H. Bullard, Bobb L. Karr

Faculty Publications

Anticipated rates of return can help landowners and forest managers evaluate hardwood control and many other stand treatments. A simple microcomputer model is discussed which displays rates of return for specific stand treatment conditions. The program can be used before or after taxes and with or without inflation. The model displays rates of return for ranges of silvicultural treatment costs and expected harvest value increases, thus providing information for evaluating treatments where growth responses or future prices are difficult to estimate.

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Wilderness And Natural Areas In The Eastern United States: A Management Challenge, David Kulhavy, Richard N. Conner Jan 1986

Wilderness And Natural Areas In The Eastern United States: A Management Challenge, David Kulhavy, Richard N. Conner

Faculty Publications

"The purpose of this symposium is not to debate either the concept of wilderness or the amount of wilderness appropriate for the United States. These are not debatable issues for present purposes. The Congress has spoken twice. The Wilderness Act of 1964 (PL 88-577) and the amendments of 1975, known as the "Eastern Wilderness Act" (PL 93-622), both set-aside existing areas as wilderness and established procedures for consideration of additions to the wilderness system. The purpose of this symposium is to consider the management of wilderness areas over time. In a very real sense, if those areas established as wilderness …

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