Chemistry Commons^™

Activity Of $\Gamma $-Al$_{2}$O$_{3}$-Based Mn, Cu, And Co Oxide Nanocatalysts For Selective Catalytic Reduction Of Nitric Oxide With Ammonia, Parvaneh Nakhostin Panahi, Gerard Delahay

Turkish Journal of Chemistry

Our studies on the selective catalytic reduction of NO (SCR-deNO) properties of M/$\gamma $-Al$_{2}$O$_{3}$ (M = Mn, Co, Cu) nanocatalysts are presented. All catalysts were prepared by homogeneous deposition precipitation using urea as the precursor for the precipitating agent. The SCR activity followed the order Mn/$\gamma $-Al$_{2}$O$_{3} >$ Cu/$\gamma $-Al$_{2}$O$_{3} >$ Co/$\gamma $-Al$_{2}$O$_{3}$. The nanocatalysts were characterized with respect to their texture (N$_{2}$-BET), particle size (TEM), reducibility (H$_{2}$-TPR), and acidity (NH$_{3}$-TPD). The TEM analysis revealed that the metal species have superior dispersion with less agglomeration and sintering on $\gamma $-Al$_{2}$O$_{3}$ support. The H$_{2}$-TPR results confirmed that the Mn/$\gamma $-Al$_{2}$O$_{3}$ nanocatalyst …

Investigation Of Solvent Effect On Photophysical Properties Of Some Sulfonamides Derivatives, Ebru Bozkurt, Hali̇se İnci̇ Gül, Mehtap Tuğrak

Turkish Journal of Chemistry

The photophysical properties of new sulfonamides synthesized recently were investigated in different solvents. Shifts in the absorption and fluorescence spectra of both compounds (S10 and S11) occurred depending on the solvents used. Ground and excited state dipole moments of the molecules were calculated using the spectral shifts of the compounds in different solvents and polarity function of solvents, respectively. They were 1.32 and 1.46 D for S10 and 1.71 and 4.89 D for S11. These results suggested that the excited state dipole moments are greater than those in ground state for both molecules. This means that the dyes were more …

The Structure And Cytotoxic Activity Of A New Saponin: Cephoside A From Cephalaria Elazigensis Var. Purpurea, Peyker Kayce, Nazli Boke Sarikahya, Murat Pekmez, Nazli Arda, Suheyla Kirmizigul

Turkish Journal of Chemistry

Investigation of the aerial parts of Cephalaria elazigensis var. purpurea afforded one new oleanane-type saponin, namely cephoside A (1), and five known natural compounds (2-6). Compound 2, named anemoclemoside A, which is an unusual triterpene glycoside, was identified in the family Dipsacaceae for the first time. Chemical structures of all compounds were determined on the basis of the HRESIMS and 1D and 2D NMR data. Cephoside A (1) and anemoclemoside A (2) were assessed for their cytotoxic activities against HeLa cells, having IC$_{50}$ values of 495 and 135 $\mu $g/mL, respectively.

Development Of A Sample Preparation Strategy For The Determination Of Tungsten In Soil Samples By Inductively Coupled Plasma Mass Spectrometry Using A Response Surface Methodology, Ümran Seven Erdemi̇r

Turkish Journal of Chemistry

An alternative rapid digestion method has been developed for the determination of tungsten (W) in soil samples using fractionation studies and response surface methodology. The digestion method using the Kjeldahl instrument was applied to samples, and soluble tungsten was determined via inductively coupled plasma mass spectrometry. Digestion parameters were selected depending on the results of fractionation studies and optimized using a four-factor and five-level central composite design. The contributions of the phosphoric acid concentration (X$_{1})$, digestion temperature (X$_{2})$, digestion time (X$_{3})$, and hydrochloric acid concentration (X$_{4})$ were evaluated for the determination of W from samples in which its levels were …

Efficient Photodegradation Of Neutral Red Chloride Dye In Aqueous Medium Using Graphene/Cobalt-Manganese Oxides Nanocomposite, Khalid Saeed, Idrees Khan

Turkish Journal of Chemistry

Graphene/cobalt-manganese oxides nanocomposites were prepared from their precursor through chemical reduction where NaOH was used as a reducing agent. The obtained GNs/Co-Mn nanocomposites were used as photocatalyst for the photodegradation of Neutral Red Chloride (NRC) dye in aqueous solution under sunlight as a function of time and catalyst dosage. The morphology and photodegradation study was carried out using scanning electron microscopy (SEM) and UV-VIS spectrophotometry, respectively. The SEM image showed the presence of Co-Mn nanoparticles on the surface of GNs, which were also confirmed by energy dispersive X-ray analysis. The photodegradation study of NRC showed that the degradation of dye …

Dehydration Behavior And Kinetics Of Kurnakovite Under Microwave Irradiation, Fatma Tuğçe Şenberber, Meral Yildirim, İkli̇m Nergi̇z Özdoğan, Azmi̇ Seyhun Kipçak, Emek Derun

Turkish Journal of Chemistry

In this research, the dehydration behavior of kurnakovite was studied under microwave irradiation. The kinetic parameters of the dehydration reaction were determined using different kinetic models. Kurnakovite was characterized by the techniques of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM) before and after the dehydration process. According to the results, kurnakovite was identified as a compound with the powder diffraction file (pdf) number 00-024-0700 before the dehydration process and after the dehydration process amorphous formations were observed. Moreover, FT-IR results showed that dehydration was completed successfully because of the disappearance in the band values …

Synchrotron X-Ray Diffraction Studies Of $\Beta $-Ca$_{2-X}M_{X}$Sio$_{4}$ ($M$ = Mg And Sr), Anti Prodjosantoso, Brendan Kennedy

Turkish Journal of Chemistry

The structures of Mg- and Sr-doped $\beta $-Ca$_{2}$SiO$_{4}$ have been established from high-resolution synchrotron X-ray powder diffraction. These silicates are all isostructural and the structures have been refined in the monoclinic space group, $P$2$_{1}$/$n$. As expected based on size arguments, the cell parameters increase as the amount of Sr increases and likewise decrease as the amount of Mg increases due the size effects of the dopant cation. In all cases the SiO$_{4}$ tetrahedra are essentially regular.

A Rapid, Efficient, And Green Synthesis Of Benzo[$A$]Chromeno[2,3-$C$]Phenazine Derivatives Via Microwave Assistance And Dabco~Catalyzed A Novel Domino Cyclization, Seid-Ali Mirmiran-Yazdi, Afshin Yazdani Elah Abadi, Nasim Shams, Razieh Mohebat

Turkish Journal of Chemistry

An efficient, convenient, and environmentally benign procedure for the synthesis of novel benzo[$a$]chromeno[2,3-$c$]phenazine derivatives has been developed by domino four-component condensation reaction between 2-hydroxynaphtha- lene-1,4-dione, $o-$phenylenediamine, aromatic aldehydes, and naphthols or phenol in the presence of a catalytic amount of DABCO as an expedient, ecofriendly, and reusable base catalyst under microwave irradiation in EtOH/H$_{2}$O (1:1). This green process produces biologically and pharmacologically significant heterocycles in a single one-pot operation and offers considerable advantages such as operational simplicity, short reaction time, high yields, reusability of the catalyst, absence of any tedious workup or purification, and avoidance of hazardous reagents/solvents.

Achieving Elusive Transformations With Organocatalysis: Direct $\Beta $-Carbon Activation Of Saturated Carbonyl Compounds, Rafik Rajjak Shaikh

Turkish Journal of Chemistry

Direct $\beta $-carbon activation of saturated carbonyl compounds for carrying out fast forward $\beta$-functionalization has been one of the most difficult to achieve tasks in catalysis. In the past few years, this challenging issue has attracted considerable attention among the chemical community that has led to fruitful developments to accomplish this elusive transformation. In this short review, we highlight recent developments for direct $\beta $-carbon functionalization of saturated carbonyl compounds based on conceptually new methods including oxidative enamine catalysis, $N$-heterocyclic carbene (NHC)-assisted catalysis, and photoredox catalysis.

Photoemissive Polymer Composite Based On New Y(Iii), Gd(Iii), And Tb(Iii) Complexes With N-Hydroxyphthalimide, Catalina Yarodara Rosca, Petronela Horlescu, Corneliu S.Stan, Daniel Sutiman

Turkish Journal of Chemistry

In the present work, a green emitting composite with attractive photoluminescent properties was obtained through the embedding of the Tb$^{3+}$ complex with N-hydroxyphthalimide in a poly-(N-vinyl-pyrrolidone) matrix, which was further processed in thin or thick films. First, several complexes of Gd$^{3+}$, Tb$^{3+}$, and Y$^{3+}$ with N-hydroxyphthalimide with the general formula [M(NHF)$_{3}$(DMF)$_{2}$] were prepared at a 1:3 metal/ligand ratio. The Tb$^{3+}$ complex presents specific emission peaks, with the most intense peak located at 543 nm, thus being selected for incorporation in the poly(N-vinyl-pyrrolidone) matrix. The prepared complexes and composites were investigated through elemental analysis, thermal analysis, FT-IR, P-XRD, and SEM. The …

Novel Bis(Aminoalcohol)Oxalamide Organogelators And Their Diglycolylamide Analogs: Evaluation Of Gelation Efficiency In Various Organic Fluids, Mehmet Çolak, Deni̇z Bariş Cebe, Necmetti̇n Pi̇ri̇nççi̇oğlu, Hali̇l Hoşgören

Turkish Journal of Chemistry

Three modular types of bis(aminoalcohol)oxalamides (1,4, and 7) and bis(aminoalcohol)diglycolylamide (8) gelators have been prepared by the reaction of the respective aminoalcohols with oxalyl and digycolyl methylesters as potential low-molecular-weight organogelators. The gelation properties of these amides have been evaluated in various aromatic organic solvents (xylene, toluene, isopropyl benzene, and aromatic ether type organic fluids such as anisole or $\alpha $-phenylethylmethylether) as well as the long-chain aliphatic alcohols (1-hexanol, 1-octanol, 2-octanol, and aromatic 1-phenylethanol). The compounds with \textit{sec}-butyl and ethyl side chains produce good gelation properties in both aromatic and other organic fluids. Furthermore, the common oxalamide linker present in …

Experimental And Computational Studies On The Absorption Properties Of Novel Formazan Derivatives, Gülşen Türkoğlu, M. Emi̇n Çinar

Turkish Journal of Chemistry

Eight novel 3-(4-(benzyloxy)phenyl)-5-(4-bromophenyl)-1-(4-substituted-phenyl)formazan (4a-4h) were synthesized by coupling of substituted phenylhydrazones with diazonium salts of 4-bromoaniline. The substituted phenylhydrazones, which are intermediate products, were obtained from the condensation of substituted phenylhydrazines with 4-(benzyloxy)benzaldehyde. All target compounds were characterized by using FTIR, $^{1}$H NMR, $^{13}$C NMR, LC$-$MS spectrometry, and elemental analysis. Absorption spectra of these compounds in solvents with different polarities were investigated thoroughly. Time-dependent density functional theory (TD-DFT) studies were conducted to shed light on their electronic structures, Kohn--Sham orbitals, and electronic transitions.

Synthesis, In Vitro Dna Interactions, Cytotoxicities, Antioxidative Activities, And Topoisomerase Inhibition Potentials Of Mn(Ii), Co(Ii), Ni(Ii), Cu(Ii), And Zn(Ii) Complexes With Azo-Oxime Ligands, Melek Çol Ayvaz, İbrahi̇m Turan, Bayram Dural, Seli̇m Demi̇r, Kaan Karaoğlu, Yüksel Ali̇yazicioğlu, Keri̇m Serbest

Turkish Journal of Chemistry

Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) transition metal complexes of 2-hydroxy-5-[(E)-(4-phenyl) diazenyl] benzaldehyde oxime and 2-hydroxy-5-[(E)-(4-nitrophenyl) diazenyl] benzaldehyde oxime ligands were synthesized and characterized through NMR, IR, ESI mass, and UV analysis. DNA binding abilities of the complexes were revealed using a UV-Vis spectrophotometer with the absorption titration and competitive binding techniques. Hydrolytic and oxidative DNA cleavage activities under different conditions were also proved. Topoisomerase I inhibition efficiencies and in vitro free radical scavenging activities of all complexes were examined. Finally, the selective cytotoxic potentials of all complexes were evaluated in human colon cancer, normal colon, and fibroblast cell lines …

Removal Of Pb(Ii) And Cd(Ii) From Aqueous Solution Using Alkaline-Modified Pumice Stone Powder (Psp): Equilibrium, Kinetic, And Thermodynamic Studies, Vivian Jonasi, Kaina Matina, Upenyu Guyo

Turkish Journal of Chemistry

Adsorption processes of Cd(II) and Pb(II) from aqueous solutions onto pumice stone powder (PSP) were investigated in batch mode. The influences of solution pH, contact time, adsorbent dosage, initial metal (M) concentration, and temperature on adsorption process were investigated. The kinetic and isotherm data were analysed using different model equations. The adsorption process was consistent with the Langmuir model for both metal ions with high R$^{2}$ and low $\chi^{2}$ values for both Pb(II) and Cd(II). The maximum monolayer adsorption capacities were 28.09 and 27.17 mg g$^{-1}$ for Pb(II) and for Cd(II), respectively. The pseudo-second order kinetic model explained the kinetic …

The Multiple Effects Of Organoclay And Solvent Evaporation On Hydrophobicity Of Composite Surfaces, Haci Hasan Yolcu, Ahmet Gürses, Rabah Boukherroub

Turkish Journal of Chemistry

A superhydrophobic high-density polyethylene (HDPE)/organoclay composite material with a water-static contact angle of $\sim $162$^{\circ}$ and low hysteresis (7$^{\circ})$ was prepared by a simple solution-intercalation technique. This one-step method consists of the insertion of organoclay, produced through cation exchange with cetyltrimethylammonium bromide (CTAB), in the polymer matrix at 120 $^{\circ}$C in xylene. In this process, evaporation of the solvent and organoclay amount are key factors for the achievement of superhydrophobicity. We characterized composite material with X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and contact angle measurements. The characterizations showed that the organoclay provides a place for …

Investigation Of Photoinduced Polymerization Of Doxycycline-Imprinted Hydrogels: Effect Of Template On Initiator Reactivity, Conversion, And Reaction Rate, Di̇lek Dalgakiran, Tuğçe İnan, Fatma Seni̇ha Güner

Turkish Journal of Chemistry

Photopolymerization kinetics of doxycycline hyclate (DOX)-imprinted hydrogels were monitored by real-time Fourier transform infrared spectroscopy and differential photocalorimetry. 2-Hydroxyethyl methacrylate-based hydrogels were synthesized by using ethylene glycol dimethacrylate as a cross-linker, acrylic acid (AA) as a functional monomer, and 2,2-dimethyl-2-hydroxy acetophenone as a photoinitiator. For imprinting DOX in hydrogels, the molar ratio of template to functional monomer (DOX:AA) was chosen as 1:8 and 1:16. The polymerization was achieved at two different initiator concentrations. The conversion and reaction rate were calculated as a function of the molar ratio of template, and the results were compared to those of nonimprinted ones. In …

Synthesis Of Novel 5-Substituted Phenyl-3-(P-Isopropylphenyl)-1-Phenylformazan And Their Biological Activities, Ayşe Şahi̇n Yağlioğlu, Hülya Şenöz

Turkish Journal of Chemistry

Novel 1-substituted 3-(p-isopropylphenyl)-5-phenylformazans (3a--g) were synthesized and characterized by elemental analysis, $^{1}$H NMR, and FT-IR techniques and UV-visible spectroscopy. Antiproliferative activities of 3a--g against HeLa and C6 cells were determined using the BrdU cell proliferation ELISA assay. 5-Florouracil was used as the positive control. The effects of substituents (--H, --CH$_{3}$, and --I) and their positions ($ortho$, $meta$, and $para$) on the antiproliferative activities were evaluated. The results of the assay indicate that I substituent exhibited higher activity against the cells at the $meta$ and $para$ positions than --CH$_{3}$ and --H substituents. 3a--g exhibited both high antiproliferative activities against C6 cells …

Impurity Profiling Of Morphine By Liquid Chromatography-Heated Electrospray Ionization Mass Spectrometry (Lc-Hesi-Ms), Ana Petkovska, Jelena Acevska, Marina Chachorovska, Gjorgji Petrusevski, Gjoshe Stefkov, Rumenka Petkovska, Aneta Dimitrovska, Sonja Ugarkovic

Turkish Journal of Chemistry

Separation of morphine and its impurities (related substances specified in relevant European Pharmacopoeia monographs, as well as the other naturally occurring coextracted alkaloids) was obtained within a close retention window on a reverse phase HPLC column, eluted with optimized gradient, consisting of methanol and 5 mM ammonium formate, adjusted to pH 10.2. Systematic optimization of the chromatographic conditions was carried out using design of experiments. According to their mass spectra, known and specified impurities were identified and tentative structures for unknown impurities were proposed. MS analyses were performed in positive ionization mode using heated electrospray ionization. Fragmentation patterns of the …

A Promising Materials Approach To Combatting Renal Hyperphosphatemia: Fe(Ii)-Montmorillonites, Xiaotong Yuan, Dawei Qin, Min Qiao, Gang Liu, Hongxin Li, Xia Niu

Turkish Journal of Chemistry

The objective of the current effort was to determine the efficacy of Fe(II)-montmorillonite (Fe(II)-MMT) as an adjuvant for specific targeted adsorption of phosphate. Specifically, Fe(II)-MMT was studied to combat hyperphosphatemia and anemia arising from chronic renal failure. The adsorption of phosphate over time, pH, and initial concentration was studied. The systems were characterized by X-ray diffraction (XRD), Raman, and zeta potential. The experimental results demonstrated the adsorption time was set to 140 min to achieve maximum adsorption efficiency. It was thus found that the maximum adsorption was at pH 3.0. In addition, it reached equilibrium when the initial phosphate concentration …

Choline Chloride Eutectics: Low Temperature Applications, Kaila M. Kuehn, Camille M. Massmann, Natalie R. Sovell

The Journal of Undergraduate Research

Deep eutectic solvents (DESs) have a lower melting point than each of their individual components due to ion dipole interactions or hydrogen bonding. Traditionally, DES are used for processing metals through plating and have many synthesis applications. DES are able to be substituted for hazardous solvents that are traditionally used for metal plating and synthesis. This, along with many other advantageous properties, appear promising for the use of DESs as solvents or for use in electrochemical systems, particularly at low temperatures. Choline chloride:propylene glycol was a novel DES synthesized and analyzed for its properties, including melting point, viscosity, conductivity, heat …

Kinetic Analysis And Mechanochemical Syntheses Of Palladium Complexes, Jonathon Zachary

Murray State Theses and Dissertations

Mechanochemical synthesis is a rapidly developing, more environmentally friendly alternative to traditional solution based syntheses. Mechanochemical methods often result in higher overall yields, minimize undesirable side reactions, and present cleaner more concise methods for compound preparation. This work will address the syntheses of three dialkyl 2,2′-bipyridyl-4,4′-dicarboxylate complexes of palladium(II) iodide and the kinetics of these reactions. Then, this work will address the improved synthesis and purification of 1,3-dimethyl-1H-benzimidazolium iodide and the synthesis of diiodo-bis(1,3-dimethyl benzimidazol-2-ylidene) palladium(II).

The successful synthesis of dialkyl 2,2′-bipyridyl-4,4′-dicarboxylate complexes of palladium(II) iodide was carried out under solvent free ball milling conditions and the kinetic analysis was …

Deep Eutectic Solvents Synthesis, Characterization And Applications In Pretreatment Of Lignocellulosic Biomass, Ganesh Degam

Electronic Theses and Dissertations

There has been an increased interest in green solvents and biofuels with the growing environmental awareness across the globe. Conventional methods of biofuel production involve the use of large quantities of molecular solvents and ionic liquids (ILs), but they have the drawbacks of high vapor pressure (organic solvents), toxicity, and recyclability in terms of a sustainability point of view. Deep eutectic solvents (DESs) have recently emerged as green alternatives to molecular solvents and ionic liquids (ILs). They are defined as eutectic mixtures formed between quaternary ammonium, phosphonium or sulfonium salts and hydrogen bond donors (HBDs) with the freezing temperature lower …

Cbl And Cbl-B Dictate Csf-1r Endocytic Traffic And Signaling In Macrophages, Lu Huang

Electronic Theses and Dissertations

Macrophage colony stimulating factor receptor (CSF-1R or MCSFR) is a receptor tyrosine kinase essential for the growth and function of macrophages. Understanding the mechanisms that regulate CSF-1R activation and deactivation will provide insights to clinical treatment of macrophage related diseases including chronic inflammation and cancer. Previously, our laboratory showed that CSF-1R undergoes a novel membrane trafficking route that involves macropinocytosis to deactivate CSF-1R signaling. This thesis makes the discovery that the ubiquitin ligases Cbl and Cbl-b cooperate to regulate CSF-1R endocytosis and traffic to macropinosome in macrophages. Macrophages were derived from mice knocked out for Cbl, Cbl-b or the double …

Analysis Of Novel Cyanide Antidote Dimethyl Trisulfide For Pharmacokinetic Studies, And Sulfur Mustard Metabolites For Identification Of Biomarker Of Inhaled Dose, Erica Manandhar

Electronic Theses and Dissertations

Cyanide poisoning by accidental or intentional exposure poses a severe health risk. The current FDA approved antidotes for cyanide poisoning can be effective, but each suffers from specific major limitations. Dimethyl trisulfide (DMTS), a sulfur donor that detoxifies cyanide by converting it into thiocyanate, is a promising next generation cyanide antidote. Although a validated analytical method to analyze DMTS is not currently available from any matrix, one will be vital for the approval of DMTS as a therapeutic agent against cyanide poisoning. Hence, a stir bar sorptive extraction (SBSE) gas chromatography – mass spectrometry (GC-MS) method was developed and validated …

The Analysis Of Flavor Compounds In Green Tea Using Ice Concentration Linked With Extractive Stirrer (Icecles), Abdullah H. Alluhayb

Electronic Theses and Dissertations

Sample preparation of target components from food samples is one of the most difficult steps in this type of analysis. Many extraction techniques have been used for this purpose, such as liquid-liquid extraction (LLE), accelerated solvent extraction (ASE), microwave-assisted extraction (MAE), solid-phase extraction (SPE), solid-phase microextraction (SPME), and stir bar sorptive extraction (SBSE). Although each of these techniques works well, they each have a number of disadvantages, including selectivity, relatively high cost, long preparation time, and matrix effects. Ice concentration linked with extractive stirrer (ICECLES) is a promising new sample preparation technique, especially for the extraction of relatively polar compounds, …

Producing Dihydrofurans Using Palladium (Ii) Catalyst And Optimized Base, Chandler Mitchell

Undergraduate Honors Thesis Collection

Dihydrofurans serve as building blocks for other compounds in organic synthesis. The main goal of this project was to discover an efficient and relatively inexpensive pathway for producing monosubstituted dihydrofurans in high yield from cyclic boronic half acids. Aldehydes were converted to homoallylic alcohols by the addition of allylmagnesium bromide. The alcohols were then transformed into cyclic boronic half acids using ringclosing metathesis with Grubbs 1st Generation Catalyst and alkenyl boronic esters. Finally, monosubstituted dihydrofurans were produced using a palladium (II) catalyst with a base. Palladium (II) catalysts that were tested include [1,1'- bis(diphenylphosphino)ferrocene]palladium (II) dichloride, palladium (II) acetate with …

Use Of Trispyrazolemethane In The Synthesis Of Organometallic Compounds, Claire Hazelton

Undergraduate Honors Thesis Collection

Trispyrazoleborate is a negatively charged facially coordinating tridentate ligand that has been highly researched and used in many metal complexes. The related ligand trispyrazolemethane has not been widely studied due to its difficult synthesis. The objective of this project is to determine the effects of the neutral nature of the trispyrazolemethane on the metal carbonyl complexes of molybdenum and tungsten. Besides the ligand tricarbonyl complex, iodide and hydride derivatives were synthesized. All compounds were characterized with IR and HNMR.

Analysis Of Variable Regions In Feline Leukemia Virus Envelope Sequences, Brianna Sohl

Senior Honors Theses and Projects

Feline Leukemia Virus (FeLV) is a retrovirus that affects domesticated cats and other species in the Felis genus. There are three major subtypes, each characterized by unique disease progression and proviral sequences. FeLV-A is weakly pathogenic, -B has been associated with tumors, and -C causes severe anemia. Proviral sequences were amplified using PCR with FeL V-specific and adapter-specific primers. The method of primer walking has yielded consensus sequences for several fragments of 1,000-3,000 base pairs of proviral DNA. Sequences for ten different clones of the provirus envelope region from a FeL V positive blood sample were compared to known sequences …

Chalcogenide Nanocrystal Assembly: Controlling Heterogeneity And Modulating Heterointerfaces, Jessica Davis Davis

Wayne State University Dissertations

This dissertation work is focused on developing methods to facilitate charge transport in heterostructured materials that comprise a nanoscale component. Multicomponent semiconductor materials were prepared by (1) spin coating of discrete nanomaterials onto porous silicon (pSi) or (2) self-assembly. Spin-coating of colloidal quantum dot (QD) PbS solutions was employed to create prototype PbS QD based radiation detection devices using porous silicon (pSi) as an n-type support and charge transport material. These devices were initially tested as a photodetector to ascertain the possibility of their use in high energy radiation detection. Short chain thiolate ligands (4-fluorothiophenolate) and anion passivation at the …

Convergence Of Indigenous Science And Western Science Impacts Student's Interest In Stem And Identity As A Scientist, Sarah Omar Alkholy, Fidji Gendron, Betty Mckenna, Tanya Dahms, Maria Pontes Ferreira

Nutrition and Food Science Faculty Research Publications

Within the context of North American Indigenous culture, certain Elders are respected gatekeepers to Indigenous science, also known as traditional knowledge. Yet, while North American born minorities such as Black Americans, Amerindians, and Latin Americans may hail from cultures with a similar appreciation of their own Indigenous science Elders, these minority groups are especially underrepresented in Western science, technology, engineering, and math (STEM)—both in academia and in the workforce. North American underrepresented minorities experience high attrition rates in academia generally, and in STEM specifically. Canada’s Truth and Reconciliation Commission makes a call to action to Indigenize education to benefit all …