The investigation used radioactive carbon dioxide added to algal cells to follow the sequence of biochemical changes in photosynthesis. Samples were taken from the suspension at intervals and analyzed for radioactively labelled compounds. This allowed the compounds to be placed in the order they were formed: Q, R, S, P.
Daltons DYME Presentation - Beyond Al: Group 13 Salphen catalysts for efficie...RyanLewis164
This was the presentation given at the RSC Dalton's DYME meeting on 29/06/2021. The background of the presentation is using Group 13 Salphen catalysts for the cycloaddition between terminal epoxides and CO2 to form cyclic carbonates.
The [2,3]-Wittig rearrangement is a special class of [2,3]-sigma tropic rearrangement which involves an α-oxy carbanions as the migrating terminus to afford various types of homoallylic alcohols.
Daltons DYME Presentation - Beyond Al: Group 13 Salphen catalysts for efficie...RyanLewis164
This was the presentation given at the RSC Dalton's DYME meeting on 29/06/2021. The background of the presentation is using Group 13 Salphen catalysts for the cycloaddition between terminal epoxides and CO2 to form cyclic carbonates.
The [2,3]-Wittig rearrangement is a special class of [2,3]-sigma tropic rearrangement which involves an α-oxy carbanions as the migrating terminus to afford various types of homoallylic alcohols.
Thermodynamic Assessment (Suggestions) Of the Gold-Rubidium SystemIRJESJOURNAL
Abstract: Thermodynamic modellings of the Au–Rb system was carried out by means of the CALPHAD (calculation of phase diagrams) method. The liquid phase and the intermetallic compounds Au5Rb, Au2Rb, AuRb and Au7Rb3 and Au3Rb2 (new compounds) in addition to the compound AuRb2 (suspected compound) are taken into consideration in this optimization. The substitutional solution model was used to describe the liquid phase. The six compounds are treated as stoichiometric phases. The enthalpies of formation used in these optimizations were calculated within ab-initio method in precedent work
Computational and Experimental Studies of MTO Catalyzed Olefin HydrogenationKaram Idrees
The poster that I presented at the 253rd American Chemical Society National Meeting and Exposition in San Francisco,
CA. It highlights some of my REU research at North Carolina State University under the mentorship of Dr. Elon Ison.
Cross-Coupling of Unactivated Arenes: Direct Arene C-H Bond Arylation (Concepts of C-H Activation/Functionalization and its Recent Developments), Importance in the Drug Discovery Research
This worksheet gives pupils practice with adding up relative atomic masses to obtain relative molecular mass. Pupils will need a data sheet or a list of relative atomic masses to be able to complete the questions.
A Comparison of Spectrophotometric and Oxidoreduction Potential Method for La...CrimsonpublishersMedical
Polyphenol oxidases (PPOs) oxidize phenolic compounds forming quinones, which undergo non-enzymatic reactions resulting in colored
compounds. We studied ferulic acid and catechol oxidation by Myceliophthora thermophila laccases using oxidoreduction potential (ORP or Eh) as a novel
method to determine PPO activity compared to the traditional spectrophotometric method. Eh varied time-dependently on ferulic acid and catechol
concentrations. Eh increased to a maximum value (Ehmax), then decreased irreversibly proportional with substrate concentration. The ΔEh curves of
ferulic acid and catechol oxidation at different concentrations by laccase exhibited two steps substrate oxidation: enzymatic and non-enzymatic; linear
segments with increasing and decreasing slopes (rate of ΔEh change). The Km values determined spectrophotometrically and ORP were 0.55, 0.75 and
0.39, 0.32mM for catechol and ferulic acid, respectively. The kinetic parameters (Km, Vmax) of enzymatic reaction were not significantly different between
the spectrophotometry and ORP methods. The ORP method is simple, low-cost and fast enabling the differentiation between the enzymatic and nonenzymatic phenol oxidation reactions
Thermodynamic Assessment (Suggestions) Of the Gold-Rubidium SystemIRJESJOURNAL
Abstract: Thermodynamic modellings of the Au–Rb system was carried out by means of the CALPHAD (calculation of phase diagrams) method. The liquid phase and the intermetallic compounds Au5Rb, Au2Rb, AuRb and Au7Rb3 and Au3Rb2 (new compounds) in addition to the compound AuRb2 (suspected compound) are taken into consideration in this optimization. The substitutional solution model was used to describe the liquid phase. The six compounds are treated as stoichiometric phases. The enthalpies of formation used in these optimizations were calculated within ab-initio method in precedent work
Computational and Experimental Studies of MTO Catalyzed Olefin HydrogenationKaram Idrees
The poster that I presented at the 253rd American Chemical Society National Meeting and Exposition in San Francisco,
CA. It highlights some of my REU research at North Carolina State University under the mentorship of Dr. Elon Ison.
Cross-Coupling of Unactivated Arenes: Direct Arene C-H Bond Arylation (Concepts of C-H Activation/Functionalization and its Recent Developments), Importance in the Drug Discovery Research
This worksheet gives pupils practice with adding up relative atomic masses to obtain relative molecular mass. Pupils will need a data sheet or a list of relative atomic masses to be able to complete the questions.
A Comparison of Spectrophotometric and Oxidoreduction Potential Method for La...CrimsonpublishersMedical
Polyphenol oxidases (PPOs) oxidize phenolic compounds forming quinones, which undergo non-enzymatic reactions resulting in colored
compounds. We studied ferulic acid and catechol oxidation by Myceliophthora thermophila laccases using oxidoreduction potential (ORP or Eh) as a novel
method to determine PPO activity compared to the traditional spectrophotometric method. Eh varied time-dependently on ferulic acid and catechol
concentrations. Eh increased to a maximum value (Ehmax), then decreased irreversibly proportional with substrate concentration. The ΔEh curves of
ferulic acid and catechol oxidation at different concentrations by laccase exhibited two steps substrate oxidation: enzymatic and non-enzymatic; linear
segments with increasing and decreasing slopes (rate of ΔEh change). The Km values determined spectrophotometrically and ORP were 0.55, 0.75 and
0.39, 0.32mM for catechol and ferulic acid, respectively. The kinetic parameters (Km, Vmax) of enzymatic reaction were not significantly different between
the spectrophotometry and ORP methods. The ORP method is simple, low-cost and fast enabling the differentiation between the enzymatic and nonenzymatic phenol oxidation reactions
Oxidation of 7-Methyl Sulfanyl-5-Oxo-5H-Benzothiazolo-[3, 2-A]-Pyrimidine-6-...inventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Detailed characterization of saponins isolated from Zygophyllum Propinqueem D...Open Access Research Paper
Zygophyllum propinquum Decne (syn. Z. coccineum, family: Zygophyllaceae) is a low shrub, perennial herb, or desert succulent undershrub and has several important biological activities. The major secondary metabolites of this plant are a class of ursane-type triterpene saponins. Saponins derive their name from stable foam formation in water. These saponins have peculiar properties like, bitterness, fish poisoning, haemolysis, complex formation with cholesterol. Saponins are consisting of two main parts, one is the aglycone part while the other one is the glycone part. The glycone part is further consisting of sugar moieties. Current studies were conducted to isolate specifically biologically important saponins. Saponins were isolated successfully using standard procedures and characterized successfully using different spectroscopic techniques including Fourier Transform-Infrared Spectroscopy, Mass Spectrometry and Nuclear Magnetic Resonance Spectroscopy. Two saponins were isolated from the whole plant of Zygophyllum propinquum Decne with the help of repeated column chromatography and HPLC. The purified saponins were hydrolyzed with H2SO4-dioxane resulting in lactone formation. All the compounds (saponins and lactone) were characterized with the help of FAB-MS and 1D and 2D-NMR techniques. Their structures were confirmed to be 3-O–β-D-glucopyranosyl-(1→6)- β-D-2-O-sulfo-glucuronopyranosylurs-20(21)-en28 oic acid 28-O-[β-D-glucuronopyranosyl] ester (1), (3β–O-2-O-sulfo-β-D-glucuronopyranosylurs-20(21)-en28 oic acid 28-O-[β-D-2-O-sulfonylglucuronopyranosyl] ester (2), and 3β-Hydroxy urs-28,20 β-olide (3).
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
The IOSR Journal of Pharmacy (IOSRPHR) is an open access online & offline peer reviewed international journal, which publishes innovative research papers, reviews, mini-reviews, short communications and notes dealing with Pharmaceutical Sciences( Pharmaceutical Technology, Pharmaceutics, Biopharmaceutics, Pharmacokinetics, Pharmaceutical/Medicinal Chemistry, Computational Chemistry and Molecular Drug Design, Pharmacognosy & Phytochemistry, Pharmacology, Pharmaceutical Analysis, Pharmacy Practice, Clinical and Hospital Pharmacy, Cell Biology, Genomics and Proteomics, Pharmacogenomics, Bioinformatics and Biotechnology of Pharmaceutical Interest........more details on Aim & Scope).
All manuscripts are subject to rapid peer review. Those of high quality (not previously published and not under consideration for publication in another journal) will be published without delay.
This Journal publishes original research work that contributes significantly to further the scientific knowledge in pharmacy.
Synthesis, spectroscopic, magnetic properties and superoxide dismutase (SOD) ...IOSR Journals
Three new ternary copper(II) complexes formulated as [Cu(HIda)(bipy)] 1; [Cu(HIda)(phen)] 2; [Cu(HIda)(dmp)] 3; where HIda =N-(2-hydroxyethyl)-2- iminodiacetic acid ; bipy = 2, 2’- bipyridine; phen = 1,10- phenanthroline; dmp = 2,9-dimethyl 1,10-phenanthroline, have been synthesized and characterized by partial elemental analysis, FAB-mass (m/z), EPR, UV-visible and CV measurements. The magnetic and spectroscopic data of all these complexes 1-3 indicate distorted octahedral geometry. The EPR spectra of these complexes in frozen DMSO solutions showed a single at g ca. 2. The trend in g-value (g||>g>2.0023) suggests that the unpaired electron on copper (II) has dx2–y2 character. The SOD activities of the complexes have been investigated. Antibacterial and antifungal activity of these complexes were also measured and discussed.
Synthesis and Crystal Structure of Anickel (II) and Zinc (II) Complex From 1,...IOSRJAC
:The title mononuclear nickel and zinc complexes, Ni(C11H9N4S3)2andZn(C11H9N4S3)2 .2(C3H7NO), were prepared by the reaction of Nickel(II) or Zinc(II)acetate with 1,5-bis[(2- thiophenyl)methylidene]thiocarbonohydrazide in a methanol solution. It features mono-deprotonated bisbidentate ligands, which coordinate to metal (II) ions by hydrazylN and thiocarbony lS atoms, yielding a tetracoordinated metal ions complexes. In Ni(II) complex the geometry around the metal ion is described as square planar. In the Zn(II) the metal atom shows severely tetrahedral distortion from anideal square-planar coordination geometry, as reflected by the dihedral angle between ZnN2and ZnS2 planes of 73.03(13)°. Two intramolecular hydrogen bonds are observed between the solvate dmf molecules and the coordinated ligands:N2—H2N…O1i and N6—H6N…O2 ii in this complex
Switching Off and On the Supramolecular Chiral Memory in PorphyrinAngela Mammana
we have reported here an example of a totally
noncovalent memory system able to cycle between “written” and
“erased” states. We think that this example opens the route for a
general approach and new pathways to design systems able to
memorize imprinted chiral information and successively cycle
between erased and rewritten states
A new Schiff base 4-chlorophenyl)methanimine
(6R,7R)-3-methyl-8-oxo-7-(2-phenylpropanamido)-5-thia-1-
azabicyclo[4.2.0]oct-2-ene-2-carboxylate= (HL)= C23H20
ClN3O4S) has been synthesized from β-lactam antibiotic
(cephalexin mono hydrate(CephH)=(C16H19N3O5S.H2O) and 4-
chlorobenzaldehyde . Figure(1) Metal mixed ligand complexes
of the Schiff base were prepared from chloride salt of
Fe(II),Co(II),Ni(II),Cu(II),Zn(II) and Cd (II), in 50% (v/v)
ethanol –water medium (SacH ) .in aqueous ethanol(1:1)
containing and Saccharin(C7H5NO3S) = sodium hydroxide.
Several physical tools in particular; IR, CHN, 1H NMR, 13C
NMR for ligand and melting point molar conductance, magnetic
moment. and determination the percentage of the metal in the
complexes by flame(AAS). The ligands and there metal
complexes were screened for their antimicrobial activity against
four bacteria (gram + ve) and (gram -ve) {Escherichia coli,
Pseudomonas aeruginosa, Staphylococcus aureus and Bacillus}.
The proposed structure of the complexes using program, Chem
office 3D(2006). The general formula have been given for the
prepared mixed ligand complexes Na2[M(Sac)3(L)], M(II) = Fe
(II), Co(II) , Ni(II), Cu (II), Zn(II) , and Cd(II).
HL= C29H24 ClN3O4S, L= C29H23 ClN3O4S -.
A photoactive bimetallic complex comprising a photosensitizer
ruthenium unit and a catalytic Mn(I) unit connected via a
bipyrimidine (bpm) bridging ligand is prepared and used for the first time for developing a light induced copper catalyzed [3 + 2] azide−alkyne “click” (CuAAC) reaction for the formation of 1,2,3-triazoles under visible light irradiation. The developed bimetallic complex exhibited enhanced activity as both the photosensitizer ruthenium unit as well as manganese catalyst unit are attached in a single molecule, providing efficient electron transfer for the photochemical reduction of Cu(II) to Cu(I) in situ which subsequently was used for the cycloaddition of azides with terminal alkynes to give 1,4-disubstituted 1,2,3-triazoles in the presence of triethylamine as a sacrificial donor.
5. An investigation was carried out to find out the sequence of biochemical changes that occur during photosynthesis. Radioactive carbon dioxide was added to a suspension of algal cells, and they were allowed to photosynthesise. At intervals, samples of the suspension were removed into hot alcohol. These samples were analysed for different radioactively labelled compounds.
6. (a) Explain how the use of radioactive carbon dioxide in this investigation allows the sequence of biochemical changes in photosynthesis to be followed. (2) (b) Suggest a reason for the use in this investigation of (i) hot alcohol; (ii) a rapid action tap. (2) Samples were removed from the suspension at five different times, between 5 seconds and 600 seconds after the start of the experiment. In each sample, the radioactivity in four different organic compounds, P , Q , R and S , was measured. The table shows the results. (c) Use this information to place the compounds P , Q , R and S , in the order in which they were formed in photosynthesis. _____________ > _____________ > _____________ > _____________ (1)
7. (a) (Radioactive) carbon dioxide is used / incorporated; New compound(s) / intermediate(s) / names egs formed / become labelled; (b) (i) stops reaction(s)/ process / pathway / enzyme action / kills cells; (ii) reactions occur quickly OR need to remove samples after short / precise time; (c) Q ® R ® S ® P ;
8. 1. (a) The diagram shows part of the light-independent reaction of photosynthesis. (i) How many carbon atoms are there in one molecule of glycerate 3-phosphate? (1) (ii) What is the function of each of the following in the reactions shown in the diagram? Reduced NADP ATP (2)
