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The ligand, N,N'-bis(salicylidine)ethylenediamine or salen (L), and its complexes 1-3 with Ni(II), Cu(II) and Mn(II) were synthesized. Various analytical methods such as microanalysis, 1H-NMR, 13C-NMR, ESI-MS and FT-IR spectroscopy has been used to characterize the synthesized compounds. Antibacterial activity of the prepared compounds were tested against two Gram-positive bacteria Staphylococcus aureus and Bacillus subtillus and two Gram-negative bacteria Pseudomonas aeroginosa and Escherichia coli by agar well diffusion method. Antibacterial screening results indicate that the metal compounds are more biologically active than the free ligand. The variation of metal ions appears to influence their antibacterial activity toward different organisms. The mode of action of the synthesized metal complexes as antibacterial agents have also been explained.

The condensation of aromatic aldehyde with amine results in the formation of Schiff's bases, which are considered to be one of the most significant groups of ligands. Schiff's base metal complexes have received a lot of attention because of their high biological activity. Such include antimicrobial, anticancer, antibacterial, and antifungal activities. The current research is focused on the synthesis and characterization of two Schiff's base ligands obtained from the reaction of isoniazid with 4-(N,N-dimethylamino)benzaldehyde (L1) and 5-nitro-2-furfurldehyde (L2), respectively and their metal complexes with Cu2+, Zn2+, and Ni2+ ions. FT-IR, UV-Vis, conductivity, and magnetic susceptibility (µeff) measurements were used to describe the ligands (L1 and L2) and their complexes. The square planar geometry of Cu2+ and Ni2+ complexes, as well as the tetrahedral geometry of Zn2+ complexes, are supported by the Uv-Vis spectra and magnetic moments data. Their antibacterial effectiveness against various pathogenic microorganisms was evaluated in the presence of standard Kanamycin-30. The CuL2 complex, among all the metal complexes derived from the L2 ligand, exhibited better antibacterial activity against S. aureus than that of Kanamycin-30. When compared to the BHT antioxidant, all Cu2+ complexes showed excellent efficacy.

Cr3+, Co2+, Ni2+, Cu2+ and Zn2+ ions complexes of the Schiff base ligand, N-(4-hydroxybenzylidene)isonicotinohydrazone (L1), were synthesized and characterized by analytical and physicochemical techniques including conductivity measurements, magnetic susceptibility measurements, IR Spectroscopy, UV-Visible Spectrophotometry and thermogravimetric analysis (TGA). IR data revealed the bidentate nature of the L1. IR, TGA, Magnetic moment measurements and UV-Vis spectra data confirmed the octahedral geometry for the Cr3+, Co2+, and Cu2+ ion complexes, square planar geometry for the Ni2+ complex and tetrahedral structure for the Zn2+ ion complex. The antibacterial activity of the metal complexes derived from the L1 ligand were tested against P. aeruginosa and E. coli. All produced complexes demonstrated strong antibacterial efficacy against P. aeruginosa when compared to standard Kanamycin-30, with the greatest for the Ni2+ complex. On the other hand, when compared to all compounds, the Zn2+ complex demonstrated strong antibacterial efficacy against E. coli. Furthermore, the synthesized metal complexes exhibited moderate antioxidant activity than the L1. The antioxidant activity was found to follow the following sequence: BHT > CuL1 > CrL1 > NiL1 > CoL1 > ZnL1 > L1.

Transition metal complexes of Cu2+, Ni2+ and Co2+ with the Schiff base ligand, N-(2-methoxybenzylidene)isonicotinohydrazone, (L1) were synthesized by the conventional condensation approach. Ligand and its metal were characterized by FT-IR, UV-Vis, Magnetic moment measurements and Thermogravimetric (TGA) analysis. IR spectra revealed that the Schiff base ligand coordinated to the metal ion through nitrogen (N) of azomethine group and oxygen (O) of carbonyl group. IR data coupled with TGA analysis confirmed the presence of coordinated water molecules. Antibacterial activity for both ligand and its complexes were investigated against some pathogenic bacteria and the best activity was observed in the case of the CuL1 against E. coli when compared with standard drug, Kanamycin-30. The antioxidant activity of the CuL1 complex was the greatest among all the complexes when compared to that of BHT.

The research on jute fiber reinforced polymer composites is an emergent concern with the development of new materials due to their significant properties like economical, partially biodegradable, and environment friendly. It is wondered that the hydrophilic nature of jute fiber negatively affects the interfacial interaction with hydrophobic polymeric materials in the composite, which then affects the resultant mechanical, microstructural and physico-chemical absorption properties. In order to overcome this fact, researchers have carried out some techniques for fiber surface chemical treatments. On the other hand, due to the low processing costs and design flexibility, thermoplastics deal many benefits over thermoset polymers, and polyethylene shows excellent processing behaviors such as low density, low cost, considerable flex life, outstanding surface hardness, scratch resistance and good electrical insulator. Besides the traditional thermoplastic and thermosetting polymers, montmorillonite nanoclay is also receiving attention to manufacturing fiber polymer nanocomposites for industrial and household applications as well. This review is considered to highlight the progress of jute fiber reinforced polymer nanocomposites. The study also focuses on the several features of jute polymer composites and nanocomposites as a function of fiber chemical treatments.

A series of transition metal complexes having general formula [M(Lb)(L1)](NO3)2, (where, M = Cu(II), Ni(II), and Zn(II)) of mixed ligands, Lb = N-Isonicotinamido-Thiophene-2-Carbaldimine, L1 = 1, 10-phenanthroline, were synthesized. The obtained compounds were successfully characterized by different spectroscopic techniques. Conductivity measurements indicated that all complexes were 1:2 electrolytes in nature. IR spectra indicated that ligands coordinated to metals via the carbonyl oxygen atom and the azomethine nitrogen atom. Magnetic moment values and UV-Visible spectra confirmed square planar structure around the Cu(II), and Ni(II) ions, and a tetrahedral geometry around the Zn(II) ion. The metal complexes of Lb and L1 were tested against Escherichia coli and Pseudomonas sp. Among the tested compounds, Zn(II)complex showed higher antibacterial activity over both bacterial strains against reference drug Kanamycin. Moreover, synthesized metal complexes exhibited moderate antioxidant activity than the Schiff base. Cu(II) complexes were found to be most active whereas, Zn(II) complexes showed the lowest antioxidant activity comparable to the BHT.

A new Schiff base Co(II) complex and - peroxo complex were synthesized and characterized by thin layer chromatography (TLC), elemental analyses, magnetic moment, conductivity measurements, UV-Vis., IR and ESI-MS spectral studies. The cobalt ion was participated in direct complexation with the Schiff base (SB) ligand derived from o-aminobenzoic acid and cinnamaldehyde during the single pot reaction. IR spectral data showed that the Schiff base ligand coordinated to the metal ion through nitrogen of azomethine group and oxygen of carboxyl group (COO-). The molar conductance values indicated that both the complexes are non-electrolytic in nature. Antibacterial activity of the complexes was tested against four pathogenic bacteria namely Staphylococcus aureus, Bacillus cereus, Escherichia coli & Shigella dysenteriae with standard Kanamycin-30. The results showed that both type of complexes have moderate to strong antibacterial activity and the peroxo complex is relatively more potential towards all the tested organisms.

Zr (IV) and Sn (II) complexes were prepared with bidentate ligand, benzyl 2-(3-phenylallylidene) hydrazinecarbodithioate, derived from the condensation of S-benzyldithiocarbazate (SBDTC) with cinnamaldehyde and characterized by microanalysis, molar conductance and magnetic measurements, IR, electronic and ESI-MS studies. It was found that the ligand coordinated to the metal center through azomethine nitrogen and thiol sulfur atoms to form octahedral complexes with both the metal ions. The antimicrobial activities of the ligand and its complexes were investigated against the gram-positive and gram-negative bacteria and the fungus strain. The metal complexes showed strong activity than the free ligand.

In this study, jute polyethylene clay nanocomposites were developed using hot press technique. The hydrophilic nature of fiber and nanoclay exhibited poor interfacial interaction to hydrophobic polymer matrix. In order to enhance the interfacial interaction among fiber, polymer, and nanofillers, the chemically treated jute (with benzenediazonium salt, propionic anhydride, and 3-isocyanatopropyltriethoxy silane) and organically modified nanoclay were used for the manufacturing of nanocomposites in this study. The effect of chemical treatments and nanoclay addition on the improvement of absorption characterizations of prepared nanocomposites against water and few chemical reagents have been investigated. It has been observed that the treated jute composites showed higher improvement in absorption properties than raw jute composite and silane treated jute composite found highest value. In addition, nanoclay filled composites showed higher improvement than composite without nanoclay and MMT-1.31PS nanoclay loaded nanocomposite exhibited highest improvement among five types of MMT nanoclay used in this work. The fabricated nanocomposites were resistant to all chemicals used except carbon tetrachloride.

Two new peroxo-complexes of Cd(II) and Zr(IV) ion containing Schiff base (SB) were synthesized and characterized by Thin Layer Chromatography (TLC), Elemental analyses, conductivity, magnetic moment measurements, UV-Vis. and FT-IR spectral studies. The Schiff base ligand derived from cinnamaldehyde and o-aminophenol participated in complexation through a single pot reaction. FT-IR spectra showed that the Schiff base ligand coordinated to the metal ion through nitrogen of azomethine group and oxygen of hydroxyl group & peroxo group (O-O). The molar conductance values indicated the non-electrolytic nature of both the complexes. Antibacterial activity of the complexes was tested against four pathogenic bacteria, two Gram-positive Staphylococcus aureus & Bacillus cereus and two Gram-negative Escherichia coli & Shigella dysenteriae with standard Kanamycin-30. The result showed that Cd(II) complex exhibited more potential antibacterial activity than the Zr(IV) complex against all the tested pathogens.

Two new peroxo complexes of Cu(II) and Ni(II) ion containing Schiff base (SB) were synthesized and characterized by TLC, Elemental analyses, conductivity, magnetic moment measurements, UV-Vis. and IR and ESI-MS spectral studies. The Schiff base ligand derived from cinnamaldehyde and o-aminophenol participated in complexation through a single pot reaction. IR spectra showed that the Schiff base ligand coordinated to the metal ion through nitrogen of azomethine group and oxygen of hydroxyl group & peroxo group (O-O). Magnetic moment value coupled with electronic spectral data suggested a square planar geometry for both the complexes. The molar conductance values indicated the non-electrolytic nature of the complexes. Antibacterial activity of the complexes was tested against four pathogenic bacteria, two Gram-positive Staphylococcus aureus & Bacillus cereus and two Gram-negative Escherichia coli & Shigella dysenteriae with Kanamycin (K-30) standard. The result shows that Cu(II) complex exhibited more potential antibacterial activity than the Ni(II) complex against all the tested organisms.

A novel series of three trivalent mononuclear ternary complexes of the type, [ML1L2] [M = Cr(III), Fe(III) and La(III), HL1 = 2-((2-(2,4-dinitrophenyl)hydrazone)methyl)phenol, HL2 = 2-aminophenol] was investigated by various physio-chemical studies. To obtain additional information inside the structure, density functional theory calculation was also carried out. The synthesized complexes showed remarkable antimicrobial activity when tested against A. niger, A. flavus, R. stolonifer, C. albicans, E. coli and Klebsiella sp. microbes. Furthermore, the molecular docking analysis was also carried out to analyze the interactions in protein–ligand complexes. Moreover, the quantitative structure–activity relationship was also investigated to study the biological activity of the ligand.

The metal (II) complexes, Na2[ML2] [M = Cu, Co, Ni, and Zn], of salicylaldehyde thiosemicarbazone (L) containing a trifunctional ONS-donor system have been synthesized and characterized on the basis of physicochemical data by elemental analysis, magnetic moment, molar conductance, and spectroscopic (electronic, IR and ESI-MS). The ligand functions as ONS tridentates producing octahedral complexes. All compounds showed significant antibacterial activity in different ranges against gram positive (Bacillus subtillus) and gram negative (Escherichia coli) bacteria.

The ligand, L is the Schiff base formed by condensation of 1- naphthaldehyde with semicarbazide and its Cu(II) complex have been synthesized and characterized by elemental and thermogravimetric analysis and molar conductivity, magnetic and spectroscopic measurements. Elemental analysis of the chelate suggests the stoichiometry is 1:1 (metal-ligand). Infrared spectra of the complex agree with the coordination to the central metal atom through the nitrogen of the azomethine (-HC=N-) group and the carbonyl oxygen atom. Magnetic susceptibility data suggest a tetrahedral geometry for the complex. ESI-MS data also supports the proposed structure of the synthesized compounds. The ligand and its copper complex have been screened for their antibacterial activity against Enterobacter aerogenes and Bacillus cereus. The metal complex were shown to possess more antibacterial activity than the uncomplexed ligand.

Water quality is the key of environmental concern because of its important provision of water for drinking and domestic purpose, irrigation and aquatic life including fish and fisheries. The present study was conducted to assess the surface water quality of the Shitalakhya River from January, 2017 to December, 2018. Temperature, pH, EC, TDS, TSS, BOD5, Alkalinity, Total Hardness, Calcium Hardness, Magnesium Hardness, Chloride, Dissolved Silica, Total Iron concentration and Turbidity in water samples have been found in the ranges 24 - 33°C, 6.5 - 7.6, 108 - 478 µS/cm, 54 - 245 ppm, 8 - 118 mg/l, 6 - 12 mg/l, 36.6 - 231.8 mg/l, 30 - 190 mg/l, 20 - 120 mg/l, 10 - 80 mg/l, 3.54 - 9.91 mg/l, 16 - 51 mg/l, 0.10 - 1.5 mg/l, 2.09 - 120 NTU in the year 2017 and 21 - 32.5°C, 6.7 - 7.3, 101 - 424 µS/cm, 55 - 212 ppm, 10 - 154 mg/l, 7 - 16 mg/l, 42.7 - 219.6 mg/l, 35 - 180 mg/l, 25 - 115 mg/l, 10 - 70 mg/l, 4.96 - 16.99 mg/l, 19 - 84 mg/l, 0.10 - 2.50 mg/l, 2.73 - 214 NTU in the year 2018 respectively. Obtained results of the present study area shows that most of the parameters were within the permissible limit except Turbidity, Total Suspended Solid (TSS), Dissolved Silica (SiO2) and Biological Oxygen Demand for five days (BOD5). Use of river water can pose serious problems to human health and aquatic ecosystem via biological food chain. The present research suggests special preference for better management of the river water to protect the health of aquatic ecosystem of the river.

New complexes of Cu (II) and Ni (II) of the Schiff Base, 2-(((2-((4-hydroxybenzylidene) amino)ethyl)imino)methyl) phenol were synthesized and characterized by analytical and physico-chemical techniques including magnetic susceptibility, conductivity measurements, electronic and IR spectral studies. The infrared spectral studies revealed the tetra-dentate nature of the Schiff base in the complexes. On the basis of all characterizations, square- planar geometry has proposed for all the obtained complexes. The complexes showed moderate antimicrobial activity against Escherichia coli and Staphylococcus aureus.

Averrhoa bilimbi fruit has been studied to find out a possible source of bioactive compounds against antimicrobial and cytotoxic activity. To achieve this goal, total phenolic content and total flavonoid content, antioxidant, antimicrobial and cytotoxic activities of five different fractionates such as methanolic crude, petroleum ether, chloroform, ethyl acetate and water fraction of A. bilimbi were investigated by UV-vis spectrophotometry, disc diffusion and brine shrimp lethality test methods simultaneously. Other phytochemicals viz. carbohydrate, tannins, polyphenols, glycosides, etc. were also screened out by conventional test methods concurrently. Total phenolic contents and total flavonoid contents were found to be ranging from 3.807-262.129 mg GAE g–1 and 67.848-1159.061 mg CE g–1, respectively, in all the analyzed fractions. DPPH free radical scavenging activity revealed distinctive IC50 value of 5.63 and 10.26 μg mL–1 in the chloroform and ethyl acetate extractives. Fractionates of petroleum ether and methanolic crude also presented strong cytotoxic potential with the LD50 values of 8.89 and 20.3 μg mL–1 in the brine shrimp lethality bioassay test. Petroleum ether and ethyl acetate fractions exhibited good antimicrobial activity with the zone of inhibition against Bacillus cereus (11 mm and 14 mm) and Escherichia coli (7 mm and 9 mm). Finally, it has been recommended that A. bilmbi fruit might be an effective source of bioactive compounds against antimicrobial and cytotoxic activity as well as antioxidant with potent radical scavenging activity.

In present study, a quantitative evaluation of macro and micronutrients in Averrhoa bilimbi, Mimusops elengi and Carissa carandas tropical fruits have been presented. Concentration of the nutrients namely calcium, chromium, manganese, iron, nickel, zinc and two toxic heavy metals cadmium and lead present in the fruits are used as traditional folk medicines in Bangladesh were determined by flame atomic absorption spectrometric method. The concentration of the elements for Averrhoa bilimbi was found to be followed by the order as: Ca (1.98 ppm) > Fe (0.515) > Zn (0.080) > Mn (0.038) > Cr (0.006) > Pb (0.004) > Ni (0.0016) > and Cd (0.0015 ppm), respectively. The order for that of Mimusops elengi was found to be as: Ca (3.175 ppm) > Fe (0.784) > Zn (0.049) > Mn (0.038) > Pb (0.008) > Ni (0.008) > Cd (0.003) > Cr (0.001 ppm) and the same issue for the Carissa carandas was found to be Ca (4.277 ppm) > Fe (0.676) > Zn (0.040) > Mn (0.040) > Pb (0.005) > Ni (0.004) > Cr (0.002) > Cd (0.0009 ppm), respectively. From the obtained results, the analyzed fruits might be an admirable natural source of nutrients Ca, Fe and Zn. Concentration of toxic elements Pb and Cd found to be of very few ppb levels and should not be considered as toxic in consumption by human beings.

Five new oxovanadium (IV) complexes have been synthesized from two mixed ligand, 5,6-Dimethyl-1,10-phenanthroline and amino acid derived Schiff bases containing salicylaldehyde. All the synthesized complexes were characterized by some physicochemical properties, molar conductance, magnetic susceptibilities measurements, elemental analysis, UV-Visible and IR spectral studies. The molar conductance values reveal the non-electrolytic nature of the complexes. The magnetic moment values indicate that the complexes are paramagnetic in nature. IR spectral data indicates the coordination of tridentate amino acid Schiff base ligands to the vanadyl (VO2+) ion through O, N, Odonor. ESI-MS spectral data confirms the proposed molecular formula of the complexes. All the analytical data suggested that all the complexes possess to have distorted octahedral geometry. Antibacterial activity of the complexes was tested against two Gram positive bacteria Escherichia coli and Pseudomonas aeruginosa and two Gram negative bacteria Staphylococcus aureus and Bacillus cereus with Kanamycin (K-30) standard. The result shows that all the complexes possess to have moderate to strong potential antibacterial activity against all the tested pathogenic bacteria.

Ureas and thioureas, otherwise known as carbamides and thiocarbamides, respectively, are rich sources of nitrogen. Urea has a wide range of applications in agriculture, the chemical industry, and a...

Two complexes of Cu(II) and Ni(II) with the ligand N- (4-methoxybenzylidene) isonicotinohydrazide, having the formula [M(La)2]2+ (M = Cu(II) and Ni(II)) were synthesized. The ligand was synthesized by the condensation of isonicotinic acid hydrazide (isoniazid) with 4- methoxybenzaldehyde (p- anisaldehyde). The complexes were characterized by FTIR, UV-Vis spectroscopy, molar conductivity, magnetic susceptibility and evaluated for their in vitro antibacterial activity against human pathogens like gram negative Escherichia coli (E. coli) and gram positive Bacillus cereus (B. cereus)strains. The results indicate that all complexes consist of N and O coordination with metals has better antimicrobial activity.

This chapter describes the generation of coal ash from Indian thermal power plants, its stabilization for pipeline transportation and its utilization as fly ash bricks. For the disposal of coal/fly ash (high concentration) a detail investigation of rheological behaviour is required. The rheological characteristics of fly ash (FA) samples are studied with some natural and synthetic surfactant systems. Presence of surfactant reduces viscosity of the slurry and also increases the wetting properties of solid particles. Moreover, the surfactant role of bottom ash as a viscosity reducing agent is also discussed herewith. Furthermore, the detailed characterization and its utilization as fly ash bricks (FAB) have also been discussed.

The jute polyethylene nanocomposites were manufactured using the hot-press technique with different fiber weight fractions. The hydrophilic nature of fiber exhibited poor interfacial interaction to hydrophobic polymer matrix. Three types of chemical reagents such as: benzenediazonium salt (BDS), propionic anhydride (PA), and 3-isocyanatopropyl triethoxysilane (Silane) have been used to reduce hydrophilicity of jute fibers. The chemical resistance tests of prepared composites were performed in order to observe whether these composites are resistant to various chemicals such as: acids, alkalis, and solvents. It was observed that the fabricated composites were resistant to all chemicals except carbon tetrachloride. The treated jute composites showed higher chemical resistance than raw jute composite and silane treated jute composite gave the highest resistance which can be suggested for making the water and chemical storage tanks.

A new series of [Ni(II)L2](1), [Cu(II)L2](2) and [Co(II)L2](3)(L = benzyl-2-((1E,4E)-1,5-diphenylpenta-1,4-dien-3-ylidene) hydrazine carbodithioate) Schiff base metal complexes have been synthesized. The ligand and its metal complexes were characterized by elemental analysis, 1H NMR, UV-Vis, FT-IR and magnetic moment, molar conductance and thermal analysis. The electrochemical behaviors of these complexes were investigated by cyclic voltammetry in DMF. The spectroscopic analyses and magnetic moment value suggested four coordinated geometry for three metal complexes, tetrahedral structure of complex 1 and square planer structure of complex 2 and 3. The ligand and its metal complexes were evaluated for their antibacterial (Bacillus cereus, Bacillus subtilis, Escherichia coli) activities. The complex 1 and Complex 2 revealed moderate activity against both gram positive bacteria (B. cereus and B. subtilis) with the minimum inhibitory concentration (MIC) value of 256 microg/mL.

Five oxovanadium(IV) complexes of the type [VO(L)(DPhen)], containing Schiff base derived from α-amino acid, [where L = 3-hydroxybenzaldehyde-α-alanine (hb-Ala), 3-hydroxybenzaldehyde-DL-phenylalanine (hb-Phe), 3-hydroxybenzaldehyde-leucine (hb-Leu), 3-hydroxybenzaldehyde-glycine (hb-Gly) and 3-hydroxybenzaldehyde-DL-methionine (hb-Met) & DPhen = 5,6-Dimethyl-1,10-phenanthroline] have been synthesized and characterized by some physicochemical properties, molar conductance, magnetic susceptibilities measurements, elemental analysis, UV-Visible, FT-IR and EIS-MS spectral studies. The molar conductance values evidenced the non-electrolytic nature of the complexes. The magnetic moment values of the complexes are in accordance with the d1 electronic configuration of the VIVO2+ moiety and indicates the paramagnetic behavior of the complexes. IR spectral data indicates the coordination of tridentate amino acid Schiff base ligands to the vanadyl (VO2+) ion through O, N, O-donor. ESI-MS spectral study confirmed the proposed structure of the complexes. All the analytical data suggested that all the complexes possess to have distorted octahedral geometry. The complexes were screened for their antibacterial activity against four human pathogenic bacteria; two Gram positive Escherichia coli & Pseudomonas aeruginosa and two Gram negative Staphylococcus aureus & Bacillus cereus with Kanamycin (K-30) standard. The result shows that all the complexes have moderate to strong potential antibacterial activity against all the pathogenic bacteria. This work is licensed under a Creative Commons Attribution 4.0 International License.

Objective: The aim of the present study was to prepare highly luminescent additive composite polymer with hyamine 1622 and Thioglycolic Acid (TGA) coated CdTe Quantum Dots (QDs). Methods: The additive nano-composite was synthesized by the colloid synthesis method for the first time. The properties like particle size, fluorescence efficiency, fluorescence imaging, self-assembling, quantum dots, encapsulation, etc. were characterized by the employing of instrumental techniques such as1H and13C NMR, Fourier Transform Infrared spectroscopy (FT-IR), BAB image analysis sys-tem spectroscopy, Atomic Force Microscopy (AFM), Transmission Electron Microscopy (TEM) and Energy Dispersive X-Ray Spectroscopy (EDS). Results: CdTe quantum dots were stabilized successfully in the solid phase by hydrophobic conversion with hyamine 1622 as the cationic surfactant. The experimental results show that the prepared composite is ideal for various applications, easily synthesized, safe, and maintain good fluorescence properties. Conclusion: The newly prepared additive nanocomposite having sharp and narrow excita-tion/emission properties is expected to be applicable in biomedical/analytical systems. ©2020 Bentham Science Publishers. Türkiye Bilimsel ve Teknolojik Araştirma Kurumu, TÜBITAK; Sakarya Üniversitesi: DABAP/2012-02-04-034 This study was funded by The Scientific and Technological Research Council of Turkey (TUBITAK-BIDEP). We are grateful to their support. The project was also supported by the research fund of Sakarya University (DABAP/2012-02-04-034). We thank The Scientific and Technological Research Council of Turkey (TUBITAK) for their support, Sakarya University for allowing the study in the research labs and Rajshahi University for giving permission to Dr. Md. Ku-drat-E-Zahan to perform the study. This study was funded by The Scientific and Technological Research Council of Turkey (TUBITAK-BIDEP). We are grateful to their support. The project was also supported by the research fund of Sakarya University (DABAP/2012-02-04-034). 2-s2.0-85089812978

The intense red-emitting NaCaY 0.2 Eu 0.8 (MoO 4 ) 3 phosphor was prepared by using a sol-gel method for the first time. Thermogravimetric-diferential thermal analysis, X-ray diffraction, field-emission scanning electron microscopy, FT-IR and luminescent measurements were used to characterize the NaCaY 0.2 Eu 0.8 (MoO 4 ) 3 particles. The resulting products obtained by using the sol-gel method have a narrower size distribution and a more regular particle shape than those obtained by using the solid- state reaction. The spectra analysis indicated that the obtained phosphor could be excited by UV light of 395 nm and visible light of 466 nm, also emits intense red light with a maximum at about 614 nm. The luminescent intensity of sol-gel derived is comparable with the solid state product and it is about 84% of solid-state product under 395 nm light excitation. Comparative study with YAG:Ce and CaS:Eu 2+ phosphors, suggested that our synthesized phosphor can be used as an efficient red-emitting phosphor to compensate the red deficiency of YAG:Ce phosphor and also can serve as an alternative phosphor to replace sulfide based phosphors in the solid-state lighting applications.

A novel bidentate Schiff base containing NS donor sequences was synthesized by condensing S-methyldithiocarbazate (SMDTC) with p-anisaldehyde. A series of complexes of the ligand with Cu(II), Ni(II), Zn(II), Pb(II), Co(II), Mn(II) and U(VI) were studied and characterized by various physico-chemical methods. Cu(II), Ni(II) and Zn(II), Pb(II) complexes were four-coordinate with square plannar and tetrahedral geometry respectively. Co(II), Mn(II), and U(VI) complexes were six-coordinate with octahedral geometry. Antimicrobial activity of the prepared complexes was tested as resistance to antimicrobial agents in a wide variety of nosocomial and community-acquired pathogens. The highest antimicrobial activity was detected for the complex Co(II) against candida species.

A novel series of transition metal complexes of Mn(II), Fe(III) Co(II), Ni(II), Cu(II), and Sb(III) containing the bidentate Schiff base derived from condensation of S-methyldithiocarbazate and cinnamaldehyde were synthesized and characterized by IR, 1H NMR, UV-Vis, and some physical measurements. IR spectral studies indicated the binding sites of the Schiff base ligand with the metal ions. Molar conductance data and magnetic susceptibility measurements indicated monomeric and neutral nature of the complexes. The complexes demonstrated moderate to strong antimicrobial activity.

The use of probiotic Lactobacilli has moved from concept to implement in different applications. The study was carried out to establish the synergistic role of co-cultures of Lactobacillus casei, L. delbrueckii, L. plantarum and L. helveticus in lemon juice (LJ) preservation as well as investigate the inflammatory- and toxicity profiles of biopreserved LJ ingested shigellosis mice. Lactobacilli were cultured individually and cocultured with different combinations. Four strain Lactobacilli had significant preservative activity than any other combinations in both free and microencapsulated Lactobacilli. The four microencapsulated bacteria extended shelf-life of the LJ in about two weeks at 4°C. The free or microencapsulated bacteria were increased acidic pH into LJ. It was evidently proved that microencapsulated cocultures of different strains remained viable over a long period of time and the probiotically fermented juice were potentially inhibiting the pathogenic growth. For inflammatory acute shigellosis, therapies were divided into six groups: LJ only; LJ containing pathogenic bacteria (PB); LJ containing curd, the source of Lactobacilli; LJ containing curd and PB; LJ containing four Lactobacilli LAB1,3,4,6 and LJ containing chemical preservatives (PR, prophyl paraben and methyl paraben 9:1). Lactobacilli preserved LJ were found to be favorably lower inflammatory haematological profiles such as ESR, WBC count and C-reactive protein (CRP) agglutination in acute shigellosis mice. In addition, biopreserved LJ was safe owing to normal ranges of SGPT, SGOT, SALP and AA levels in shigellosis mice. Prospective studies on mechanisms of the probiotic activities might be enable their new medical applications for food preservation and treatment of inflammatory dysentery patients.

The popular food, dairy products like curds are consumed by many people in its various forms in Bangladesh. Infact, these different types of curds are made without real respect for basic standards of technology and hygiene. This situation will be improved if lactic ferments are well-identified and their synergy taken into consideration. Not much information has been reported about the Lactobacilli species responsible for curd production in Bangladesh. In this context, this study was conducted to identify and characterize lactic acid bacteria in curds to provide scientific data needed for improvement of the fermented product. Twenty samples were collected from the producers of curds in the supermarket of Shaheb Bazar, Rajshahi. The culture media used were Czapek Dox (pH 5.3), M17, MRS and nutrient broth and agar for the investigation of lactic acid bacteria. The identified lactic acid bacteria were Lactobacilli including Lactobacillus casei (sample 1), Lactobacillus delbrueckii (sample 3), Lactobacillus plantarum (sample 4) and Lactobacillus helveticus (sample 6) based on morphological characteristics, catalase activities, milk coagulation, growth at different temperature, growth in medium with different NaCl concentrations, growth at Original Research Article