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The Impact Of Comprehensive Allocation And Flow-Through Method Of Accounting For The Income Taxes On The Investment Decision: A Field Experiment., Zafar Ullah Khan Jan 1987

The Impact Of Comprehensive Allocation And Flow-Through Method Of Accounting For The Income Taxes On The Investment Decision: A Field Experiment., Zafar Ullah Khan

LSU Historical Dissertations and Theses

The purpose of this study was to determine whether investment decisions are affected by (1) alternative methods of accounting for income taxes and (2) the magnitude of deferred tax credits in the balance sheet. Financial analysts were asked to estimate net income and stock price, and to provide equivalence intervals as measures of uncertainty. The subjects based their predictions upon financial statements of a real company and selected financial information. Six different forms of the information cue set were used--three accounting methods (deferred method of comprehensive allocation, flow-through, and flow-through with footnote disclosure of deferred taxes as under the deferred …

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Analyses Of Selected Factors Affecting The Accuracy Of Aerial Surveys Of Mottled Ducks., James Ronald Nassar Jan 1987

Analyses Of Selected Factors Affecting The Accuracy Of Aerial Surveys Of Mottled Ducks., James Ronald Nassar

LSU Historical Dissertations and Theses

Two experiments were conducted to test the effects of observer ability, ambient illumination, glare, sun angle, time of day, bird reaction, wetland type, vegetative cover, and non-flushing birds on results of aerial surveys of mottled ducks (Anas fulvigula). In Experiment I, aerial surveys for mottled ducks were conducted in Louisiana from January 1985 through April 1986 to determine the effects of observer, weather, glare, time of day, and bird reaction on results. An experienced, but non-current, waterfowl observer initially detected a greater number of birds than an experienced and current observer, observers did not differ in 17 subsequent surveys. Time …

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Core-Excitoninduced Desorption From Mgo, Richard L. Kurtz, Roger Stockbauer, Ralf Nyholm, S. Anders Flodström, Friedmar Senf Jan 1987

Core-Excitoninduced Desorption From Mgo, Richard L. Kurtz, Roger Stockbauer, Ralf Nyholm, S. Anders Flodström, Friedmar Senf

Faculty Publications

Core-exciton-induced desorption of O and H from MgO(100) and MgO(111) has been observed using photon excitation energies spanning the O K edge. Electron-yield data from partially oxidized Mg implies that these states are localized in the near-surface region. O and H desorption results from the decay of different O core-exciton states as well as the states produced by interband transitions. The O excitonic levels are interpreted in terms of their related atomic origin. © 1987 The American Physical Society.

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The Cemetery As A Cultural Manifestation: Louisiana Necrogeography., Tadashi Nakagawa Jan 1987

The Cemetery As A Cultural Manifestation: Louisiana Necrogeography., Tadashi Nakagawa

LSU Historical Dissertations and Theses

Cultural geography, in order to advance as a science, must stand on a deductive theory which is subject to empirical tests. This study establishes a scientific theory for geographical interpretation of cultural landscape by using Louisiana cemeteries as empirical objects. Based upon the assumption that, ultimately, only individual men can play a causative role in the creation of the cemetery landscape, a theory is constructed by examining man's action modeled on the practical syllogism. Operationally defined, culture is the expression of the individual's voluntary group identity that can be identified by comparing groups. A variety of group identities which are …

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A Characterization Of The Ternary Matroids With No M(K4)-Minor, James G. Oxley Jan 1987

A Characterization Of The Ternary Matroids With No M(K4)-Minor, James G. Oxley

Faculty Publications

Brylawski identified the class of binary matroids with no minor isomorphic to M(K4) as being the class of series-parallel networks. From this he deduced that, for all such matroids M, the critical exponent c(M; 2) is at most 2. He also conjectured that a similar result is true over all finite fields GF(q). This paper examines the classes of ternary and GF(4)-representable matroids with no M(K4)-minor. The main result characterizes the former class by showing that, with one exception, the only non-trivial 3-connected members of this class are whirls or minors of the Steiner system S(5, 6, 12). This characterization …

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Continuous Pythagoras Numbers For Rational Quadratic Forms, Charles N. Delzell Jan 1987

Continuous Pythagoras Numbers For Rational Quadratic Forms, Charles N. Delzell

Faculty Publications

We introduce the concept of the continuous Pythagoras number Pc(S) of a subset S of a commutative topological ring to be, roughly, the least number m ≤ ∞ such that the set of sums of squares of elements of S can be represented as sums of m squares of elements of S, by means of m continuous functions. Heilbronn had already shown that Pc(Q) = 4. Letting Ln(F) be the set of linear n-ary forms over the field F, we show that Pc(Ln(R)) = n. We then allow continuously varying nonnegative rational "weights" on the m square summands. If these …

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The Danish Cadastral Survey Of St. Croix, 1733-1754 (Virgin Islands)., Daniel Price Hopkins Jan 1987

The Danish Cadastral Survey Of St. Croix, 1733-1754 (Virgin Islands)., Daniel Price Hopkins

LSU Historical Dissertations and Theses

This dissertation presents the history of the original cadastral survey of St. Croix by the Danish West India and Guinea Company in the early eighteenth century. St. Croix, the largest of the United States Virgin Islands, is distinguished by a remarkably regular and rectangular pattern of roads and properties, which appears to have had no parallel in the Lesser Antilles or Denmark. This is a case study of how colonial administrators approached the problem of the orderly alienation and demarcation of previously undivided land. The study is based mainly on original manuscript Company records in the Danish State Archive in …

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The Impact Of The American Presence On Germans And German-American Grass Roots Relations In Germany, 1950-1960., Dewey Arthur Browder Jan 1987

The Impact Of The American Presence On Germans And German-American Grass Roots Relations In Germany, 1950-1960., Dewey Arthur Browder

LSU Historical Dissertations and Theses

This study is primarily concerned with the years 1950-1960, but the period 1945-1949 is also addressed, because many of the policies and institutions introduced to democratize Germany immediately after World War II were carried forward. The official position on both sides during the 1950s was that cooperation was of the essence. In the beginning, the Americans believed that the virtues of democracy could best be cultivated in the German consciousness if the Germans themselves implemented democratic programs under broad, philosophical guidelines, while simultaneously observing Americans and American ideas in practice. This study points out that the Germans accepted the guidelines …

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Crime And Punishment In The Royal Navy: Discipline On The Leeward Islands Station, 1784-1812 (England)., John D. Byrn Jr Jan 1987

Crime And Punishment In The Royal Navy: Discipline On The Leeward Islands Station, 1784-1812 (England)., John D. Byrn Jr

LSU Historical Dissertations and Theses

This dissertation is based primarily on the manuscript sources pertaining to the Leeward Islands station between 1784 and 1812 found in the Public Record Office. Its thesis is quite simple: Discipline in the Royal Navy in the age of sail was maintained in much the same fashion that law and order was enforced in the localities of eighteenth-century England. In short, justice afloat was administered according to the principles and practices used in the system of criminal law ashore.

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Molecular Cloning And Sequencing Of The Bacillus Stearothermophilus 6-Phosphofructo-1-Kinase Gene And Of A Partial Rabbit Muscle 6-Phosphofructo-1-Kinase Complementary-Dna., Brent Arthur French Jan 1987

Molecular Cloning And Sequencing Of The Bacillus Stearothermophilus 6-Phosphofructo-1-Kinase Gene And Of A Partial Rabbit Muscle 6-Phosphofructo-1-Kinase Complementary-Dna., Brent Arthur French

LSU Historical Dissertations and Theses

A system is presented for determining the relationships between structure and function in the allosteric enzyme 6-phosphofructo-1-kinase (PFK). The ATP-dependent phosphorylation of fructose 6-phosphate to fructose 1,6-bisphosphate catalyzed by PFK is the first reaction unique to the glycolytic pathway. The structure-function relationships in PFK can now be addressed by site-specific mutagenesis. This is a method for directly testing hypotheses concerning the functions of individual amino acids in a protein molecule. The main body of this dissertation is composed of three sections. The first two sections describe the development of a system by which the structure-function relationships in Bacillus stearothermophilus PFK …

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An Analysis Of Management Practices---Louisiana Sheep Producers Association, 1986., Terry Lee Dumas Jan 1987

An Analysis Of Management Practices---Louisiana Sheep Producers Association, 1986., Terry Lee Dumas

LSU Historical Dissertations and Theses

The objectives of this study were: (1) To develop a personal profile of the membership of the Louisiana Sheep Producers Association (LSPA). (2) To determine the relationship between flock management practices followed by members of LSPA and their purpose for producing, size of operation, age and education. (3) To determine the educational needs in sheep production. The data were obtained by a mail questionnaire sent to 275 of the 304 members of LSPA. A total of 189 members engaged in sheep production returned the surveys. Chi-square, analysis of variance and correlation analysis was used to determine statistically significant relationships (.05 …

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The Louisiana Cooperative Extension Service: A Descriptive History Of Its Origin And Development. (Volumes I And Ii)., Edwin Clark Forrest Jr Jan 1987

The Louisiana Cooperative Extension Service: A Descriptive History Of Its Origin And Development. (Volumes I And Ii)., Edwin Clark Forrest Jr

LSU Historical Dissertations and Theses

This dissertation studies the conditions which brought the Louisiana Cooperative Extension Service (LCES) into existence in 1914 and which have sustained it for over 70 years. The U.S. Department of Agriculture estimates that 40 percent of Russia's population consists of farmers and that approximately 70 percent of China's population are farmers. The significance of these figures in relation to productivity is apparent when contrasted with the United States farm population of 2 percent. The current high level of production in American agriculture, sustained by such a small percentage of the population, is not an accident, as Professor Roy V. Scott, …

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An Investigation Of The Inference And Mapping Components Of The Componential Theory Of Analogical Reasoning., Catherine Sheard Jan 1987

An Investigation Of The Inference And Mapping Components Of The Componential Theory Of Analogical Reasoning., Catherine Sheard

LSU Historical Dissertations and Theses

Sternberg's componential theory of analogical reasoning (1977) provides a series of steps that may be followed in order to solve analogies. According to Sternberg, when given a simple analogy (in the form A:B::C: (D$\sb1$, D$\sb2$, D$\sb3$)) the reasoner: (a) encodes the terms of the analogy, (b) infers the relation between A and B, (c) maps the relation between A and C, (d) applies a relation analogous to the inferred one from C to each answer option, choosing the closer option, and (e) responds. The purpose of this research was to further investigate the inference and mapping processes of the componential …

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Factors Affecting Developmental College Readers' Abilities To Mobilize And Use Prior Knowledge., Rhonda Holt Atkinson Jan 1987

Factors Affecting Developmental College Readers' Abilities To Mobilize And Use Prior Knowledge., Rhonda Holt Atkinson

LSU Historical Dissertations and Theses

The purpose of the study was to examine differences in comprehension scores and recall of expository text by developmental college readers following manipulation of traditional and technological factors affecting use of mobilized prior knowledge. This research differed from previous research in three ways. First, it endeavored to determine if a visible link between old and new knowledge would enhance comprehension and recall. Second, it compared traditional (verbal statements) and technological (computer-mediated) methods of linking prior knowledge and new information. Third, it featured the use of individual brainstorming as a means of mobilizing schemata. The literature review focused on theory and …

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Design Of A Generic Manufacturing Cell Control System., Derya Pamukcu Jan 1987

Design Of A Generic Manufacturing Cell Control System., Derya Pamukcu

LSU Historical Dissertations and Theses

The feasibility of design and demonstration of a cell control system to function in the fully integrated manufacturing environment independent of the parts produced or the manufacturing processes involved was investigated. A hierarchical control structure was used. Free standing implementations of a cell controller, a workstation controller, and programmable device interfaces were designed. The system is data driven, and was designed to use the manufacturing databases that exist in the computer integrated manufacturing environment. Operation of the cell controller and its interaction with the rest of the system was demonstrated in real-time by simulating the computer integrated manufacturing environment on …

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Regulation Of Dextransucrase Secretion By Proton Motive Force In Leuconostoc Mesenteroides., David Roland Otts Jan 1987

Regulation Of Dextransucrase Secretion By Proton Motive Force In Leuconostoc Mesenteroides., David Roland Otts

LSU Historical Dissertations and Theses

The relationship between proton motive force and the secretion of the enzyme dextransucrase (E.C. 2.4.1.5) in Leuconostoc mesenteroides was investigated. The transmembrane pH gradient was determined by measurement of the uptake of radiolabeled benzoate or methylamine while the membrane potential was determined by measurement of the uptake of radiolabeled tetraphenylphosphonium bromide. Leuconostoc mesenteroides was able to maintain a constant proton motive force of $-130$ mV when grown in fermenters at constant pH while a value of $-140$ mV was determined from concentrated cell suspensions. The contribution of the membrane potential and transmembrane pH gradient to the proton motive force varied …

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Acceptability And Effectiveness Of Group Contingencies For Improving Spelling Achievement., Timothy Lawrence Turco Jan 1987

Acceptability And Effectiveness Of Group Contingencies For Improving Spelling Achievement., Timothy Lawrence Turco

LSU Historical Dissertations and Theses

This 12-week study conceptually merged cooperative learning and group contingency approaches to classroom interventions to assess how varying task and incentive structures affect fifth-grade students' spelling achievement, social status, and perceptions of treatment procedures. The study used two groups (treatment and control group) of fifth-grade students. The students in the treatment group were actively involved with one of six group contingency procedures designed to improve spelling performances. The conditions for students in the treatment groups varied on dimensions of task structure (group or individual) and incentive structure (interdependent, dependent, or no incentive). Treatment acceptability, spelling achievement, and peer nominated social …

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A Study Of Political Bias In Decisions Made By The National Labor Relations Board In Unfair Labor Practice Cases., Ronald Harold Schroeder Jan 1987

A Study Of Political Bias In Decisions Made By The National Labor Relations Board In Unfair Labor Practice Cases., Ronald Harold Schroeder

LSU Historical Dissertations and Theses

An important question has pervaded the field of labor-management relations for over fifty years: Is political bias present in the decisions rendered by National Labor Relations Board members in unfair labor practice cases? This study develops and tests a model of Board member decisions in selected unfair labor practice cases over the period 1962-1983. By studying 2147 decisions made by seventeen individual members, a relationship was found among the decisions and several variables of political party affiliations, personal background factors of members, and conditions within the procedure by which allegations of unfair labor practice violations are processed for decision. Political …

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A Rhetorical Analysis Of Selected Republican Speeches In The 1856 Presidential Election Campaign., Linda Jean Webster Jan 1987

A Rhetorical Analysis Of Selected Republican Speeches In The 1856 Presidential Election Campaign., Linda Jean Webster

LSU Historical Dissertations and Theses

The Republican party organized its first presidential campaign in 1856. The party was composed of men from a wide variety of political backgrounds, primarily from free soil and anti-slavery groups. The rhetoric of this first Republican campaign represented the efforts of these individual speakers to reconcile their free soil arguments with the official party platform. Although the party was loosely organized and poorly funded, many respected orators participated in the campaign. As background for the rhetorical analysis, the major political and historical events of the decade are identified in the first two chapters. Bleeding Kansas, abolitionism, and the reorganization of …

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The Management Of Dying: Tasks And Social Relationships In Patient Care., Jeffrey Michael Clair Jan 1987

The Management Of Dying: Tasks And Social Relationships In Patient Care., Jeffrey Michael Clair

LSU Historical Dissertations and Theses

A grounded theory approach guides the interpretation of observational, semi-structured interviews, content analysis, and taped discourse data collected from a 48 bed oncology unit with 288 study patients. Data are presented to explicate generated concepts of regressive intervention and the dying role. Data indicate that when physicians no longer perceive their goals of cure achievable, they distance themselves from patients. Physicians use certain devices to facilitate this gradual or abrupt, but purposeful, withdrawal from patients' curative regimens. These devices are specified in discourse transcripts as use of the medical record, silence, and alternative interactions (family members). Physician-authority, cautious optimistic conversational …

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Development Of A Soft-Tissue Infection Model In The Cow., Cyril Roy Clarke Jan 1987

Development Of A Soft-Tissue Infection Model In The Cow., Cyril Roy Clarke

LSU Historical Dissertations and Theses

The ultimate goals of this study were to develop and define a subcutaneous tissue chamber as a suitable device for establishing a Pasteurella haemolytica soft-tissue infection model in cattle and to use this model to study the in vivo efficacy and distribution of a potentiated sulfa antimicrobial. Developmental studies resulted in the selection of a suitable tissue chamber design that maximized the chamber penetration of an intravenously administered lipid-soluble drug. This chamber could be sampled with ease and contained enough chamber fluid to allow repetitive sampling. Cytological and chemical investigation revealed that the composition of fluid within chambers approached the …

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Marital Relationships And Conflict Resolution Skills Of Bulimics., Dorothy Jo Van Buren Jan 1987

Marital Relationships And Conflict Resolution Skills Of Bulimics., Dorothy Jo Van Buren

LSU Historical Dissertations and Theses

Bulimia is an eating disorder characterized by episodic binge eating and other related symptomatology. Previous research suggests that bulimics experience interpersonal problems particularly in the areas of conflict resolution and in their satisfaction with their roles within their families and marriages. The present study compared 12 bulimic couples to 14 maritally distressed couples and 15 normal control couples on measures of relationship satisfaction, conflict resolution styles, and beliefs about intimate relationships. In addition, couples' communication styles were analyzed based on their participation in an analogue conflict situation. Results of this study provided support for the contention that bulimics experience dissatisfaction …

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Interactions Of Weed, Nematode, And Arthropod Management Strategies With The Louisiana Sugarcane Agroecosystem: A Holistic Perspective., Allan Thomas Showler Jan 1987

Interactions Of Weed, Nematode, And Arthropod Management Strategies With The Louisiana Sugarcane Agroecosystem: A Holistic Perspective., Allan Thomas Showler

LSU Historical Dissertations and Theses

Interactions among Louisiana sugarcane (Saccharum hybrids), weeds, nematodes, sugarcane mosaic virus (SCMV), and pest, prey, and predatory arthropods were mediated through tropic, host plant biochemical, and intra- and interspecific competitive relationships. Weed competition reduced crop biomass (15%, P $\le$ 0.005), and sugar yield (13%, P $\le$ 0.05). Weeds, however, were associated with more predatory arthropods, including Solenopsis invicta Buren, on the soil, weeds, and sugarcane plants, and with reduced Diatraea saccharalis (F.) injury (over 25%, P $\le$ 0.05). Without chemical D. saccharalis control, sugarcane production in weedy habitats was economically superior to that in weed-free habitats. Aldicarb, a nematicide-insecticide, diminished …

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Queueing Networks With Blocking., Horst Hermann Von Brand Jan 1987

Queueing Networks With Blocking., Horst Hermann Von Brand

LSU Historical Dissertations and Theses

The area of classical (product form) queueing networks is briefly discussed. The principal results for classical queueing networks are summarized. The transfer, service and rejection blocking policies are defined, and their use in queueing network models are presented. An overview of the literature in the area of queueing networks with blocking is given, and the relations between the three blocking policies is discussed in general. Duality theorems for open and closed queueing networks with rejection blocking and a single job class are proved. Using a duality theorem, an exact solution is found for closed blocking networks which contain so many …

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Malaysian Prawn (Macrobrachium Rosenbergii) Production Studies In Polyculture Schemes With Channel Catfish (Ictalurus Punctatus)., Mark Steven Lamon Jan 1987

Malaysian Prawn (Macrobrachium Rosenbergii) Production Studies In Polyculture Schemes With Channel Catfish (Ictalurus Punctatus)., Mark Steven Lamon

LSU Historical Dissertations and Theses

Three Malaysian prawn (Macrobrachium rosenbergii)/channel catfish (Ictalurus punctatus) polyculture studies were conducted from May 1984 through October 1986. In the first study prawn stocking size and density on catfish and prawn production were examined. In 1984 catfish, x = 24 g, were stocked at 9,884/ha. Prawns, x = 0.04 g, were stocked at 4,942, 9,884 and 14,826/ha. After 144 days catfish average weights, survival and yields were $<$340 g, $<$78% and $<$2,000 kg/ha, respectively. Prawn weight, survival and yields ranged from 34-54 g, 47-61% and 165-344 kg/ha, respectively. In 1985 catfish, x = 33 g, were stocked at 7,410/ha and prawns, x = 0.15 and 0.70 g, were stocked at 1984 densities. After 137 days catfish average weight, survival and yields were 427 g, 86% and 2,726 kg/ha, respectively. Prawn weight, survival and yields ranged from 48-73 g, 41-88% and 110-471 kg/ha, respectively. Positive economic net returns were achieved with 0.15 g prawns stocked at 14,826/ha and 0.70 g prawns stocked at 9,884 or 14,826/ha. In a second study prawn bottom location preference and movement were determined in ponds. Males were more frequently observed in the deep ends of ponds and near the ponds' perimeters, and females were observed more frequently in the shallow ends and in the middles of ponds. Prawn movement did not differ between day and night, averaging 1.1 m/hr. Two-funnel crawfish traps and box traps with slit entrances, 12 and 24 hr set times, and white light and commercial crawfish bait attractants were evaluated for capturing prawns. Traps were not effective at capturing prawns regardless of set time or attractant. In the third study catfish and prawn mean lengths and weights from cast-netted and seined samples were compared to a complete population census taken after 48, 92 and 139 days of growth. Ponds were stocked with catfish at 7,410/ha and prawns at 1984 study levels. Cast-netted samples under-estimated and seined samples over-estimated catfish size. Cast-netted and seined sample prawn means did not differ from each other or population parameters. Catfish and prawn size variation increased over time. Catfish and prawn survival decreased during the first 48 days and then remained constant throughout the rest of the grow-out period.

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A Radical Republican In The United States Senate: The Antislavery Speaking Of Benjamin Franklin Wade (Ohio)., Daniel Stewart Brown Jr Jan 1987

A Radical Republican In The United States Senate: The Antislavery Speaking Of Benjamin Franklin Wade (Ohio)., Daniel Stewart Brown Jr

LSU Historical Dissertations and Theses

The purpose of this study is to analyze the speech practices and rhetorical strategies of Senator Benjamin Franklin Wade. Wade was a member of the United States Senate from 1854-1869, representing the state of Ohio. He was an antislavery spokesman prior to his election to the Senate and became a leading force in the national forum. Focusing on his antislavery speeches in the Senate, the study explores (1) Wade's rhetorical background and experience, (2) the rhetorical setting in which Wade spoke, (3) the rhetorical proofs used by Wade, and (4) the effectiveness, quality and ethics of his speaking. The study …

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An Empirical Investigation Of The Usefulness Of Current Cost Information In Merger Prediction., Robert Kuaterng Su Jan 1987

An Empirical Investigation Of The Usefulness Of Current Cost Information In Merger Prediction., Robert Kuaterng Su

LSU Historical Dissertations and Theses

The usefulness of current cost (CC) information, as compared to historical cost (HC) information, has been a focus of debate over the last decade. Inconsistent research findings concerning this question suggest that additional evidence is needed. Given the intensive merger activity in recent years and the significance of mergers to the economy and shareholders, this study empirically investigated the usefulness of current cost information in merger prediction. Fifty-seven firms that were merged between 1981 and 1984 were selected from the FASB databank, and an equal number of nonmerged firms were matched with the merged firms. Using the subsample for 1981-82, …

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Applications Of Silicon Compounds In The Synthesis Of Insect Pheromone Analogs., Oanh Thi Vu Nguyen Jan 1987

Applications Of Silicon Compounds In The Synthesis Of Insect Pheromone Analogs., Oanh Thi Vu Nguyen

LSU Historical Dissertations and Theses

Pheromones are highly active chemical messengers which are secreted by a member of an animal species and elicit a definite behavior in other members of the same species. The study of insect pheromones has recently attracted great attention because of their purely scientific interest and their favorable prospects for the control of pest insects. The study in this dissertation aims at the elucidation of some important aspects of the mechanism of perception of insect pheromones, which is based on the fact that the cyclic analogs of the natural pheromone have partially fixed conformations, whereas the straight-chain natural pheromone is more …

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Bovine Enteropathogenic Coronavirus: The Effect Of The Host Cell And Trypsin Modification On The Virus Structure, Cytopathic Expression, And Infectivity., Karen P. St. Cyr-Coats Jan 1987

Bovine Enteropathogenic Coronavirus: The Effect Of The Host Cell And Trypsin Modification On The Virus Structure, Cytopathic Expression, And Infectivity., Karen P. St. Cyr-Coats

LSU Historical Dissertations and Theses

Human rectal tumor-18 (HRT-18) cell clones 3F3, 3E3, D2, and 4B3 exhibited differences in cellular morphology in Giemsa-stained cultures and developing monolayers. Differences were evident in growth kinetics and plating efficiency of each clone. The clones produced colonies in soft agar, demonstrating anchorage independence. Cytopathic expression (CPE) including cytoplasmic vacuolization and cell fusion occurred in BCV-L9-infected clones 3F3, D2, and 3E3. Cell fusion was inapparent in clone 4B3. Bovine coronavirus strain L9 (BCV-L9) and 5 wild-type isolates replicated in HRT-18 cells, inducing cell fusion. Strain L9, exclusively, replicated in D2BFS cells, requiring trypsin to induce cell fusion. Strain L9 produced …

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Synthesis And Characterization Of Carbon-Bridged (1(N))(2,6)Pyridinophanes., Young Je Joo Jan 1987

Synthesis And Characterization Of Carbon-Bridged (1(N))(2,6)Pyridinophanes., Young Je Joo

LSU Historical Dissertations and Theses

Pyridine-containing heterophanes, which possess a rigid non-flexible framework, similar to that of porphyrin backbones, are ideal structures to probe the electronic and/or steric effects within a highly electron-rich cavity. The syntheses of heteromacrocycles incorporating the 2,6-pyridino moiety are described. 2-Bromo-6-lithiopyridine, generated from 2,6-dibromopyridine and n-butyllithium, was used to synthesize 2,6-bis (2$\sp\prime$-(6$\sp\prime$-bromopicolinoyl)) pyridine and bis-2-(6-bromopyridyl)ketone in 36% and 63% yield, respectively. Ketalization of these ketones was accomplished by either standard acidic or basic conditions. To model a nucleophilic substitution route for cyclization of the resulting ketals, lithioacetonitriles were allowed to react with bromopyridines to produce symmetrical and unsymmetrical cyanomethine adducts in …

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