Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Social and Behavioral Sciences (103)
- Physical Sciences and Mathematics (90)
- Arts and Humanities (83)
- Life Sciences (81)
- Chemistry (58)
-
- Communication (47)
- Speech and Rhetorical Studies (47)
- Education (34)
- Plant Sciences (34)
- Sociology (26)
- French and Francophone Language and Literature (22)
- Earth Sciences (21)
- History (20)
- Music (20)
- English Language and Literature (19)
- Business (15)
- Engineering (15)
- Chemical Engineering (14)
- Economics (12)
- Human Resources Management (8)
- Psychology (6)
- Accounting (5)
- Animal Sciences (5)
- Entomology (5)
- Applied Mathematics (4)
- Linguistics (4)
- Agricultural Economics (2)
- Agriculture (2)
- Kinesiology (2)
- Art and Design (1)
- Keyword
-
- Education (994)
- Biology (844)
- Agriculture (746)
- Chemistry (605)
- General (579)
-
- Engineering (535)
- Psychology (530)
- Literature (363)
- Business administration (309)
- Physics (275)
- Economics (273)
- Physical (253)
- Clinical (234)
- Mathematics (216)
- History (194)
- Modern (187)
- Sociology (183)
- Music (159)
- Chemical (151)
- Organic (132)
- Zoology (131)
- Agronomy (130)
- Microbiology (129)
- Geology (125)
- Plant pathology (124)
- Food science and technology (108)
- Health sciences (108)
- Agricultural (107)
- Botany (107)
- Entomology (107)
- Publication Year
Articles 2491 - 2520 of 7798
Full-Text Articles in Entire DC Network
A Reading Of "A Good Man Is Hard To Find" And "A Curtain Of Green": The Influence Of Parable On Flannery O'Connor And Eudora Welty., Allison Carol Chestnut
A Reading Of "A Good Man Is Hard To Find" And "A Curtain Of Green": The Influence Of Parable On Flannery O'Connor And Eudora Welty., Allison Carol Chestnut
LSU Historical Dissertations and Theses
A Good Man is Hard to Find by Flannery O'Connor and A Curtain of Green by Eudora Welty are short story cycles harmonized by their marked imitation of the style and structure of parable. O'Connor added stories after initially sending the collection to the publisher and then rearranged them accordingly; her work represents a completed cycle. Welty's collection, published in an order different from their individual publications and their original placement in an early typescript, is an arranged cycle. Moreover, parabolic style and structure unify each cycle. A parable typically is a brief story told in the past tense, usually …
Perceptions Of Performance Appraisal By Cooperative Extension Service Agents In Selected Southern States., William L. Davis
Perceptions Of Performance Appraisal By Cooperative Extension Service Agents In Selected Southern States., William L. Davis
LSU Historical Dissertations and Theses
Appraising the performance of employees is a necessary and vital process in the management of organizations. In the Cooperative Extension System, performance appraisal concerns all employees and influences work, motivation, and ultimately educational program impacts. Perceptions of the present and ideal performance appraisal process were obtained from 558 county agents in six selected southern states. The study focused on agent perceptions of the process, as currently followed and as a desired ideal, to see if there were perceptual differences, and to see if perceptions were influenced by personal characteristics, work characteristics and features of the process itself. The performance appraisal …
A Comparison Of Models Of Parole Outcome., Larry Allen Gould
A Comparison Of Models Of Parole Outcome., Larry Allen Gould
LSU Historical Dissertations and Theses
The focus of this dissertation is on the criteria which parole boards use as the basis for their decision to release an offender on to parole. The literature strongly suggests that there are some objective measures of dangerousness on parole, such as the Salient Factor Score; however, the literature also indicates that parole boards use a great deal of subjective evaluation in making their decisions. Many of the subjective concepts used by parole boards can be measured objectively through a grounding in criminological theory. A model of parole outcome prediction which measures objectively several of the previously subjective variables, including …
Feedback Linearization Of Nonlinear Systems: Robustness And Adaptive Control., Weon Ho Kim
Feedback Linearization Of Nonlinear Systems: Robustness And Adaptive Control., Weon Ho Kim
LSU Historical Dissertations and Theses
Feedback linearization provides an effective means of designing nonlinear control systems. This method permits one to have an exactly equivalent linear system by using a coordinate transformation and state feedback. Once the nonlinear system is transformed to a linear system, one can proceed with well developed control technologies for linear systems. Feedback linearization is based on a model of the real system. If there is mismatch between the model and the real plant, feedback linearization does not yield an exactly linear system. The question of robustness then arises: will a controller based on the model be stable when applied to …
Process And Product In Prereferral Intervention: A Study Of Planning, Integrity, And Outcome., William Treen Mckee
Process And Product In Prereferral Intervention: A Study Of Planning, Integrity, And Outcome., William Treen Mckee
LSU Historical Dissertations and Theses
The purpose of the study was to obtain data on the intervention planning processes engaged in by prereferral intervention teams, primarily, through a focus on the verbal processes of teacher and committee team member interactions. Teacher and committee participation in the prereferral intervention planning process was operationalized in terms of the frequency of teacher and committee verbal interactions, in terms of numbers of questions, responses, and initiated comments made by each, as well as teacher and committee speaking time. Results of analysis of these data revealed that teachers asked few questions and initiated relatively few comments in comparison with their …
A Study On The Effects Of Additives On Selective Hydrogenation Of Trace Acetylene Over Palladium Catalysts., Yeung Ho Park
A Study On The Effects Of Additives On Selective Hydrogenation Of Trace Acetylene Over Palladium Catalysts., Yeung Ho Park
LSU Historical Dissertations and Theses
The effects of both carbon monoxide (as a gas phase additive) and potassium (as a catalyst additive) on the selective hydrogenation of acetylene over Pd/Al$\sb2$O$\sb3$ was studied by deuterium tracer experiments combined with Kemball's steady-state treatment and temperature programmed reaction (TPR). The TPR of acetylene and ethylene in hydrogen, which was attempted in this study for the first time, enabled the investigation of the behavior of the adsorbed species on Pd. CO addition to the reaction mixture significantly increased the probability of ethylene desorption during ethylene deuteration while minor effects due to CO displacement of hydrogen were observed for acetylene …
A New Condition For Arithmetic Equivalence., Donna Joy Stuart
A New Condition For Arithmetic Equivalence., Donna Joy Stuart
LSU Historical Dissertations and Theses
Two algebraic number fields K, K$\sp\prime$ are said to be arithmetically equivalent if every prime number p has the same splitting type in K as in K$\sp\prime$. Many equivalent formulations of arithmetic equivalence are known. The best-known of these is: K and K$\sp\prime$ are arithmetically equivalent if and only if their Dedekind zeta functions coincide. This dissertation provides a surprising new formulation: K and K$\sp\prime$ are arithmetically equivalent if and only if for all prime numbers p, outside a given set of density zero, the number $g\sb K (p)$ of prime factors of p in K is equal to the …
From Image To Identity: The Search For Authenticity In The Early Modernist Drama Of Maxwell Anderson, John Millington Synge, Federico Garcia Lorca And D. H. Lawrence., Janice Maria Oliver
From Image To Identity: The Search For Authenticity In The Early Modernist Drama Of Maxwell Anderson, John Millington Synge, Federico Garcia Lorca And D. H. Lawrence., Janice Maria Oliver
LSU Historical Dissertations and Theses
Working roughly from the last decades of the nineteenth century into the first quarter of the twentieth, early modernist playwrights wrote in times which were dominated by realism, but when many still looked to poetic forms for expression. They shared artistic space with realist practitioners like Ibsen and Shaw on the one hand and poetic dramatists like Yeats and Eliot on the other. Interested in dramatizing the conflict between the private and the public selves, they faced a central problem of creating a form and attendant style that could bridge the gap between the individual and her/his environment, thus harmonizing …
Timed Daily Thermopulses Alter The Circadian Hormonal Regulation Of Glucose And Lipid Metabolism., Christopher Joseph De Souza
Timed Daily Thermopulses Alter The Circadian Hormonal Regulation Of Glucose And Lipid Metabolism., Christopher Joseph De Souza
LSU Historical Dissertations and Theses
Studies were made in Syrian hamsters and Holtzman rats to examine roles for circadian rhythms in the control of body fats stores. Baseline and circadian rhythms of plasma insulin varied seasonally in the Syrian hamster. Baseline concentrations of the hormone were almost 4 times greater in scotosensitive female hamsters held on short daily photoperiods when they were fat than in lean animals at other seasons and other photoperiodic schedules. Additionally, plasma insulin levels in fat hamsters, but not in lean animals, peaked at light onset when lipogenic responsiveness to insulin is greatest. The circadian rhythms of plasma insulin are not …
Oxidative Chemical Transformations Of Sesquiterpene Lactones., Howard Gordon Pentes
Oxidative Chemical Transformations Of Sesquiterpene Lactones., Howard Gordon Pentes
LSU Historical Dissertations and Theses
Oxidative chemical transformations of sesquiterpene lactones have been carried out to determine the effect these changes have on the biological activities of these derivatives. Vacuum liquid chromatography was used extensively to isolate the sesquiterpene lactones used for these synthetic transformations. Costunolide and dehydrocostuslactone were isolated from Costus Resinoid (Saussurea lappa) and dihydroparthenolide was isolated from Ambrosia artemisiifolia. The enolate oxidations of sesquiterpene lactones with oxygen and (camphorylsulfonyl)oxaziridine have been investigate. Enolate oxidations of sesquiterpene lactones with oxygen generate low yields of both 11$\alpha$- and 11$\beta$-hydroxylactones. The yields of enolate oxidations with (camphorylsulfonyl)oxaziridine are much improved (over oxygen) and the reaction …
Interfacial Adhesion In Rayon/Nylon Sheath/Core Composite Fibers., Weiying Tao
Interfacial Adhesion In Rayon/Nylon Sheath/Core Composite Fibers., Weiying Tao
LSU Historical Dissertations and Theses
Rayon/nylon sheath/core composite fibers with enhanced adhesion were produced using a wire coating type process. One objective of this research was to determine an effective coupling agent and the most appropriate application conditions for maximum interfacial adhesion in the rayon/nylon bicomponent fibers. The second objective was to characterize the interfacial adhesion between the core fiber and the rayon skin. It was found that fumaric acid (FA) was an effective adhesion promotor for rayon/nylon composite fibers since it has difunctionality and steric hinderance necessary to form covalent bonds to both layers. After removal of the spin finish by water washing the …
An Investigation Of The Determinants Of The Municipal Decision To Privatize Residential Sanitation Collection., Richard C. Brooks
An Investigation Of The Determinants Of The Municipal Decision To Privatize Residential Sanitation Collection., Richard C. Brooks
LSU Historical Dissertations and Theses
The Governmental Accounting Standards Board (GASB) Concepts Statement No. 1, Objectives of Financial Reporting states that (GASB 1987, 27) "Financial reporting should assist in fulfilling government's duty to be publicly accountable and should enable users to assess that accountability." Government accountability requires that public officials answer to the citizenry. Further, accountability rests on the notion that the citizenry has a "right to know" (GASB 1987, 21). Therefore, according to GASB Concepts Statement No. 1, municipal accounting data should reflect public resource allocation decisions made by government officials. This study investigates the usefulness of municipal accounting data for modeling a particular …
An Investigation Of The Relationship Between Input Type And Output Modification In English As A Second Language., Doris M. V Macdonald
An Investigation Of The Relationship Between Input Type And Output Modification In English As A Second Language., Doris M. V Macdonald
LSU Historical Dissertations and Theses
Proposals regarding the beneficial effects of elements of modified interaction such as clarification requests and confirmation checks on SLA have been taken up by a number of researchers who have found evidence for their existence in discourse involving NNSs. These investigators have assumed that the presence of such interactional features are beneficial to language learning, yet there is little empirical evidence to support a causal relationship between the presence of these discourse features and change in the performance of the learner toward target-language forms. Furthermore, the potential benefits of modified interactions have not been evaluated against other classroom practices. This …
Changing Eyes: American Culture And The Photographic Image, 1918-1941., Melissa A. Mceuen
Changing Eyes: American Culture And The Photographic Image, 1918-1941., Melissa A. Mceuen
LSU Historical Dissertations and Theses
From 1918 to 1941, fast-paced changes and far-reaching crises occurred in all realms of American life--social, economic, political, cultural, and intellectual. Evidence of the culture's preoccupations showed up not only in written, but also in visual sources. Photographs helped to reveal the values of American culture, and did so with increasing frequency as the photographic process was further improved. Each visual image bore the marks of its culture, yet none provided a completely objective look at reality. For every picture was the product of the personality standing behind the camera. This study examines both the lives and the photographs of …
Acoustic Topology Of Infant Proto-Syllables., James Robert Piroli
Acoustic Topology Of Infant Proto-Syllables., James Robert Piroli
LSU Historical Dissertations and Theses
A corpus of CV-like proto-syllables was obtained from the archival recordings of three first-born infants, which were made in conjunction with earlier research on the acoustic and interactive aspects of infant language acquisition. Tokens were limited to proto-syllables with perceptual evidence of stop-like or glide-like qualities and an identifiable vowel. Following A/D sampling, measures of developmental change were made including F1/F2 steady states, transition durations, CV durations, maximum F2 velocities, F2 onset, fundamental frequency, shimmer, time-to-peak amplitude velocity, and time-to-peak F2 velocity within the transition. Contrary to expectations, the orderliness of the infant protosyllables was remarkable with few acoustic events …
Acquiring Vocabulary In A Foreign Language: Some Effects Of The Nature Of Instruction On The Knowledge And Use Of Words., Louise Stowell-Ruzicka
Acquiring Vocabulary In A Foreign Language: Some Effects Of The Nature Of Instruction On The Knowledge And Use Of Words., Louise Stowell-Ruzicka
LSU Historical Dissertations and Theses
The purpose of this study was to examine the effect that the nature of instruction of French vocabulary words has on student knowledge and use of the words on five different measures: a definition recognition test, a cloze plus word bank test, a comprehension of a text containing the words, a writing assignment designed to elicit free use of these words and a test of overall reading proficiency. Eighty-one high school students in the second year course of French constituted three treatment groups: (1) traditional instruction where students were required to learn a list of 12 words paired with their …
The Spectroscopy Of Neutral And Ionic Forms Of Triphenylformazan Derivatives., Elizabeth Wilhite
The Spectroscopy Of Neutral And Ionic Forms Of Triphenylformazan Derivatives., Elizabeth Wilhite
LSU Historical Dissertations and Theses
The spectroscopic characteristics of neutral, protonated and deprotonated triphenylformazans were investigated by means of visible absorption and $\sp1$H NMR spectroscopies. Studies of the effect of solvents and substituents on the absorption spectra of the neutral and ionic formazans were conducted. CNDO/S calculations for a series of formazans were performed to assign the electronic transitions observed in the absorption spectra of triphenylformazan. The formazan system was found to be highly delocalized and not tautomeric as had been reported. The visible transition of the U (trans-syn) form of triphenylformazan was found to arise from orbitals localized on the formazan system. The near …
Poly(Arylene Ether Sulfones): Synthesis, Modifications And Applications., Marietta Navarro Aniano-Ilao
Poly(Arylene Ether Sulfones): Synthesis, Modifications And Applications., Marietta Navarro Aniano-Ilao
LSU Historical Dissertations and Theses
Poly(arylene ether sulfones) were synthesized by aromatic nucleophilic polymerization of the monomers; 4,4$\sp\prime$-biphenol, 4-chlorophenyl sulfone, hydroquinone, and tert-butylhydroquinone. Different conditions of temperature and solvent systems were used to determine the best synthetic approaches for the preparation of poly-(4,4$\sp\prime$-biphenol/4-chlorophenyl sulfone) (1:1), poly-(4-4$\sp\prime$-biphenol/4-chlorophenyl sulfone/hydroquinone) (1:2:1), and poly (4-4$\sp\prime$-biphenol/4-chlorophenyl sulfone/tert-butylhydroquinone) (1:2:1). The use of aprotic high boiling solvent mixtures of N-methyl-2-pyrrolidone (NMP), and N-cyclohexyl-2-pyrrolidone (CHP), facilitated the formation of polymers with structures which can easily be controlled by varying the ratio of monomers, and by varying the concentration of reactants. The polymers were functionalized and modified by silylation, amination and aminomethylation. Directed silylation …
Metabolism And Mutagenicity Of Dinitropyrenes: Effect Of Chronic Ethanol Ingestion And Aroclor 1254 Pretreatment., Antal Karl Hajos
Metabolism And Mutagenicity Of Dinitropyrenes: Effect Of Chronic Ethanol Ingestion And Aroclor 1254 Pretreatment., Antal Karl Hajos
LSU Historical Dissertations and Theses
The nitroreduction of three potently mutagenic dinitropyrene (DNP) isomers by liver cytosol from Aroclor-1254-pretreated rats was studied. NAD(P)H-quinone oxidoreductase (NQOR) is increased 12- to 24-fold by this treatment and resulted in up to 5-fold induction of cytosolic DNP-nitroreductase as compared to chow-fed controls. Upon purification, NQOR activity towards menadione coeluted with C-nitroso- and 1,6-DNP nitroreductase activity. Purified NQOR catalyzed NAD(P)H-dependent reduction of all DNP, displayed the same isomer specificity as did cytosol and increased the mutagenicity of all DNP in the Ames assay up to 3-fold. In TA98NR, a strain deficient in nitroreductase, only the mutagenicity of 1,3-DNP was markedly …
An Empirical Analysis Of Ricardian Equivalence And Macroeconomic Interdependence In Korea., Jang Cheon Jin
An Empirical Analysis Of Ricardian Equivalence And Macroeconomic Interdependence In Korea., Jang Cheon Jin
LSU Historical Dissertations and Theses
The dissertation research has two objectives. The first is to investigate the relevance of Ricardian equivalence to the Korean economy. The second objective is to investigate the empirical validity of the proposition of macroeconomic interdependence in Korea. The above two issues are examined by specifying and estimating a vector autoregressive (VAR) model as a compact approximation of macroeconomic reality in Korea. The nine variables selected for the VAR model are based upon theoretical and institutional considerations. Monthly Korean data for the period 1973:5-1989:11 are used in the analysis. First differencing for eight of the system variables is determined by unit …
Pcr Amplification Of Chlamydial Momp Genes: Detection, Sequence Analysis And Evolution., Bernhard Kaltenboeck
Pcr Amplification Of Chlamydial Momp Genes: Detection, Sequence Analysis And Evolution., Bernhard Kaltenboeck
LSU Historical Dissertations and Theses
Sensitive detection and differentiation of the bacterial genus Chlamydia (C.) was accomplished using the polymerase chain reaction (PCR), and phylogenetic relationships among chlamydiae were inferred from DNA sequences of amplified major outer membrane protein (MOMP) genes. DNA of strains of C. psittaci was efficiently amplified using primers homologous to nontranslated regions of the MOMP genes (ompA). Portions of these reactions were reamplified using one different primer specific for an internal ompA sequence. Primary amplification products were differentiated by restriction analysis. Degenerate, inosine containing oligonucleotide primers homologous to terminal translated regions amplified DNA fragments of all chlamydial MOMP genes. Partial ompA …
Nuclear Transplantation: Intracellular Release And Extracellular Influx Of Calcium In Response To Electrofusion Pulse And Its Effect On Murine Oocyte Activation And Embryonic Development., Lee F. Rickords
LSU Historical Dissertations and Theses
The transplantation of early embryonic cell nuclei into oocytes in which the maternal chromosomes have been removed is a method by which multiple offspring of the same genotype can be produced. One critical factor required for successful development of nuclear transfer derived embryos is inducing the release of the recipient ooplasm from meiotic arrest (activation). This is accomplished during fusion of the two cells. The DC electrofusion pulse used to fuse the two cells together also activates the recipient ooplasm to resume meiotic events, however, the efficiency of electrofusion pulse induced activation remains low. It is known that activation of …
Conceptus-Derived Immunosuppressive Factors And Their Role In Fetal Allograft Protection., Terri Lynn Roth
Conceptus-Derived Immunosuppressive Factors And Their Role In Fetal Allograft Protection., Terri Lynn Roth
LSU Historical Dissertations and Theses
The role of conceptus-derived immunosuppressive factors in protecting the fetal allograft was investigated by first examining the immunosuppressive activity derived from ovine, caprine and hybrid conceptus trophoblast tissue. Medium conditioned by 20 day-old conceptus trophoblast tissue from each species suppressed sheep and goat lymphocyte proliferation (P $$.05) between the immunosuppressive effects of the three media on either sheep or goat lymphocytes. In subsequent studies, horse conceptus-conditioned medium (HCCM) derived from embryos at days 9, 15 and 26 of gestation, suppressed mitogen-stimulated horse lymphocytes (P $<$.001). HCCM maintained its suppressive activity following heating and repeated freeze-thawing. Using microconcentrator centrifugation, it was determined that the suppressor factor(s) was $>$100,000 MW. HCCM was tested in donkey and goat lymphocyte cultures and proved capable of …
Effects Of A Whole Language Approach Using Authentic French Texts On Student Comprehension And Attitude., Colette Hood Stelly
Effects Of A Whole Language Approach Using Authentic French Texts On Student Comprehension And Attitude., Colette Hood Stelly
LSU Historical Dissertations and Theses
The purpose of this study was to investigate the effects of a Whole Language Approach (WLA), using authentic French stories, on measures of listening and reading comprehension of fourth-year high school students of French, and on their attitudes to learning French, as opposed to students using customary textbook materials in a conventional teacher-centered classroom setting. This investigation comprised two components: (a) a quantitative component which statistically determined results on measures of listening, reading and attitude, and, (b) a qualitative component which reviewed classroom procedures through observation and interview. Analysis of variance on four separate posttests showed statistically significant differences in …
The Rhodobacter Capsulatushema Region: Nucleotide Sequence And Functional Analysis., John Joseph Eckert
The Rhodobacter Capsulatushema Region: Nucleotide Sequence And Functional Analysis., John Joseph Eckert
LSU Historical Dissertations and Theses
Most of the effort to elucidate the mechanism of oxygen-mediated regulation of tetrapyrrole biosynthesis in Rhodobacter capsulatus has focused on the first step in the biosynthetic pathway, the condensation of glycine with succinyl-CoA to form $\delta$-aminolevulinic acid. This reaction, in R. capsulatus, is catalyzed by $\delta$-aminolevulinate synthase, the product of the hemA gene. In order to facilitate further study of the hemA gene and its product, its nucleotide sequence was determined. The open reading frame encoding $\delta$-aminolevulinate synthase was determined to be 1,206 base pairs, encoding a 50,491 Da polypeptide of 401 amino acids. The DNA sequence was compared with …
Study On Two Chitin-Binding Proteins From Vibrio Parahaemolyticus., Otto Silva Gildemeister
Study On Two Chitin-Binding Proteins From Vibrio Parahaemolyticus., Otto Silva Gildemeister
LSU Historical Dissertations and Theses
Two chitin-binding proteins from Vibrio parahaemolyticus are secreted into the culture medium after the addition of chitin or oligomers of N-acetylglucosamine, but only to lower levels of expression with a few other saccharides. The first protein exhibited a very salt-resistant chitinase activity with activity maxima at pH 6 and 9. The enzyme is stable for 30 minutes at 40$\sp\circ$C, and maximal activity is reached at 50$\sp\circ$C. The chitinase hydrolyzes optimally chitin oligomer substrates with degree of polymerization of 4 and higher. The hydrolytic activity upon the chitotrimer is low; the dimer cannot be hydrolyzed by the enzyme. When incubated with …
Biosynthetic Studies Of Hairy Root Constituents Of The Heliantheae (Asteraceae) And Phytochemical Screening Of Members Of The Magnoliaceae., Marco Luis Gomez-Barrios
Biosynthetic Studies Of Hairy Root Constituents Of The Heliantheae (Asteraceae) And Phytochemical Screening Of Members Of The Magnoliaceae., Marco Luis Gomez-Barrios
LSU Historical Dissertations and Theses
The major chemical constituents of Magnolia acuminata, M. ashei, M. cordata, M. dealbata, M. fraseri, M. freemani, M. little gem, M. macrophylla, M. tripetala and M. virginiana were studied as part of a continuing search for biologically active secondary metabolites from regional plant sources and the investigation of their biosynthesis and large scale production. All these Magnolia species are rich in fatty acids and several also contain monoterpenes, sesquiterpenes, sesquiterpene lactones and lignans. The organic extract of the leaves of Magnolia virginiana provided a new sesquiterpene lactone, 4,14-dehydromagnograndiolide, and the new sesquiterpene lactol costunolactol. The known sesquiterpene lactones parthenolide and …
The Pirates' Wake: A Geography Of Piracy And Pirates As Geographers In Colonial Spanish America, 1536-1718. (Volumes I And Ii)., Peter Reppert Galvin
The Pirates' Wake: A Geography Of Piracy And Pirates As Geographers In Colonial Spanish America, 1536-1718. (Volumes I And Ii)., Peter Reppert Galvin
LSU Historical Dissertations and Theses
This geographical study of piracy in Spanish America spans from 1536, the beginning date of sustained piratical activity there, to the near dispersion of pirate forces by 1718. It identifies and relates the operations of sixteenth-century corsairs such as Francis Drake, seventeenth-century buccaneers such as Henry Morgan, and eighteenth-century freebooters such as 'Blackbeard'. Regional coverage focuses on Middle America with an occasional foray into the South Sea. The principal national agents considered are English, French, Dutch, and Spanish. The study begins by deriving a working definition of pirates and examining precedent spatial approaches by Henry Mainwaring, Ellen Semple, and Derwent …
Characterization And Potential Utilization Of Proteases From The Hepatopancreas Of Crawfish, Procambarus Clarkii., Hyeung-Rak Kim
Characterization And Potential Utilization Of Proteases From The Hepatopancreas Of Crawfish, Procambarus Clarkii., Hyeung-Rak Kim
LSU Historical Dissertations and Theses
Four electrophoretically homogenous anionic trypsins, tentatively named trypsin A, B, C, and D, were isolated from crawfish hepatopancreas. Purity was increased 56, 100, 87, and 64-fold with approximately 2.4, 8.1, 5.1, and 3.0% yield for trypsin A, B, C, and D, respectively. The molecular weights of trypsin A, B, C, and D were estimated to be 23,800, 27,900, 24,800, and 31,400, respectively, using Sephacryl S-200 gel filtration. Isoelectric points and amino acid profiles of the trypsins were similar. Caseinolytic activity was consistently highest between pH 5.5 and 10.0 for all trypsins. Amidolytic and esterolytic activities were maximum in a narrower …
Functional Morphology Of Gustatory Centers In The Brain Of The Channel Catfish, Ictalurus Punctatus., Charles Franklin Lamb Iv
Functional Morphology Of Gustatory Centers In The Brain Of The Channel Catfish, Ictalurus Punctatus., Charles Franklin Lamb Iv
LSU Historical Dissertations and Theses
Gustatory nuclei in the isthmic region of the metencephalon and in the posterior diencephalon of the channel catfish, Ictalurus punctatus, were examined anatomically and electrophysiologically. Neurons in the superior secondary gustatory nucleus (nGS) responded to taste and tactile stimulation of large peripheral receptive fields (RFs) that often included the epithelia of the oropharyngeal cavity and whole extraoral body surface. Taste responses to amino acids and nucleotides were dose-dependent, with detected thresholds from micromolar to millimolar concentrations. The RF organization within the nGS did not display the somatotopy present in the medullary gustatory nuclei. Anatomical labeling of secondary gustatory fibers showed …