Zinc oxide (ZnO) nanorods decorated with gold (Au) nanoparticles have been synthesized and used to fabricate dye-sensitized solar cells (DSSC). The picosecond-resolved, time-correlated single-photon-count (TCSPC) spectroscopy technique was explore the charge-transfer mechanism in ZnO/Au-nanocomposite DSSC. Due formation of Schottky barrier at ZnO/Au interface higher optical absorptions photoelectrodes arising from surface plasmon absorption Au nanoparticles, enhanced power-conversion...

Improving the performance of photoactive solid-state devices begins with systematic studies metal–semiconductor nanocomposites (NCs) upon which such are based. Here, we report photo-dependent excitonic mechanism and charge migration kinetics in a colloidal ZnO–Au NC system. By using picosecond-resolved Förster resonance energy transfer (FRET) technique, have demonstrated that excited ZnO nanoparticles (NPs) resonantly visible optical radiation to Au NPs, quenching defect-mediated emission...

Light-harvesting nanohybrids (LHNs) are systems composed of an inorganic nanostructure associated with organic pigment that have been exploited to improve the light-harvesting performance over individual components. The present study is focused on developing a potential LHN, attained by functionalization dense arrays ZnO nanorods (NRs) biologically important hematoporphyrin (HP), which integral part red blood cells (hemoglobin). Application spectroscopic techniques, namely, Fourier transform...

In recent years, nanotechnology has gained significant interest for applications in the medical field. this regard, a utilization of ZnO nanoparticles efficient degradation bilirubin (BR) through photocatalysis was explored. BR is water insoluble byproduct heme catabolism that can cause jaundice when its excretion impaired. The photocatalytic activated by non-radiative energy transfer pathway be influenced surface defect-states (mainly oxygen vacancies) catalyst nanoparticles. These were...

Abstract In addition to the discovery of new (modified) potent antibiotics combat antibiotic resistance, there is a critical need develop novel strategies that would restrict their off‐target effects and unnecessary exposure bacteria in our body environment. We report set photoswitchable arylazopyrazole‐modified norfloxacin present high degree bidirectional photoisomerization, impressive fatigue resistance reasonably cis half‐lives. The irradiated isomers most compounds were found exhibit...

Different-sized, 3-mercaptopropionic acid (MPA) stabilized CdTe quantum dots (QDs) have been prepared in aqueous solution, and potential cosensitization of such QDs ZnO nanorod (NR)-based dye-sensitized solar cells (DSSCs) has established. The results presented this study highlight two major pathways by which may contribute to the net photocurrent a DSSC: (1) direct injection charge carriers from semiconductor via photoinduced electron transfer (PET) (2) an indirect excitation sensitizing...

The crucial photoinduced dynamics in ZnO nanoparticles (NPs) upon complexation with the cancer drug protoporphyrin IX (PP).

In this contribution we have studied the dynamics of light harvesting ZnO nanoparticles (NPs) to a surface adsorbed sensitizing dye (SD) N719. By using picosecond resolved Förster resonance energy transfer (FRET) technique explored that excited NPs resonantly visible optical radiation SD The consequence on performance overall efficiency model NP-based dye-sensitized solar cell (DSSC) has also been explored. We demonstrated significantly depends presence high-energy photons in radiation....

We have explored light harvesting of the complex ZnO nanoparticles with biological probe Oxazine 1 in near-infrared region using picosecond-time-resolved fluorescence decay studies. used and as a model donor acceptor, respectively, to explore efficacy Förster resonance energy transfer (FRET) nanoparticle–dye system. It has been shown that FRET from states localized near surface those bulk can be resolved by measuring efficiency for various wavelengths emission spectrum. observed located...

We report a protocol for the electrochemical defluorinative carboxylation of trifluoromethyl groups accessing their highly valuable α,α-difluorocarboxylic acid analogues.

In this study, we have investigated the efficacy of electron transfer processes in hematoporphyrin (HP) and iron ((Fe)HP) sensitized titania as potential materials for capturing storing solar energy. Steady-state picosecond-resolved fluorescence studies show efficient photoinduced hematoporphyrin–TiO2 (HP–TiO2) Fe(III)-hematoporphyrin–TiO2 (Fe(III)HP–TiO2) nanohybrids, which reveal role central metal ions processes. The bidentate covalent attachment HP onto TiO2 particulates is confirmed by...

Bilirubin (BR) is a protective antioxidant; however, when its conjugation and excretion are impaired, as in neonatal hereditary jaundice, BR accumulates may cause severe neurotoxicity. Here, we report novel mechanism for ZnO nanoparticle (NP)-sensitized degradation via defect-mediated nonradiative energy transfer pathway. Among different sizes shapes, particles with diameter of 5 nm having very high concentration defect states found to be the most effective catalyst, which particularly...

The design of synthetic nanoparticles (NPs) capable recognizing given chemical entities in a specific and predictable manner is great fundamental practical importance. Herein, we report simple, fast, water-soluble, green phosphine free colloidal synthesis route for the preparation multifunctional enzyme-capped ZnS bionanocomposites (BNCs) with/without transitional metal-ion doping. enzymes α-Chymotrypsin (CHT), associated with NPs, are demonstrated as an effectual host organic dye Methylene...

ABSTRACT Purpose The objective was to determine the effectiveness of antimicrobial solutions on Streptococcus mutans in used tooth brushes. Methods Sixty children their toothbrushes twice a day, for seven consecutive days. toothbrush bristles were then immersed into 12 hours: Group I-3% neem; group II-5% turmeric; III-0.5% cetylpyridinium chloride, IV-0.2% chlorhexidine gluconate. They placed test tubes containing resultant suspensions three-fold diluted. Aliquots 0.1 ml plated Mitis...

The saliva samples were analysed for the presence of Streptococcus mutants and Lactobacillus by serial dilution technique in Mitis salivarius agar Rogosa plates respectively. Results: It was found that miswak extract had very signifi cant detrimental effect on both dental caries causing micro-organisms at tested conditions. shown reduction microbial count as compared to toothbrush saline present study. In case gender comparison, females more cariogenic bacterias number males studied....

Reactions involving electron transfer (ET) and reactive oxygen species (ROS) play a pivotal role in carcinogenesis cancer biochemistry. Our present study emphasizes UVA radiation induced ET reaction as one of the key aspects potential carcinogen, benzo[a]pyrene (BP), presence wide variety molecules covering organic p-benzoquinone (BQ), biological macromolecules like calf-thymus DNA (CT-DNA), human serum albumin (HSA) protein, inorganic zinc oxide (ZnO) nanorods (NRs). Steady-state...

Free-standing, bi-directionally permeable and ultra-thin anodic aluminum oxide (AAO) membranes establish attractive templates (host) for the synthesis of nano-dots rods various materials (guest). This is due to their chemical structural integrity high periodicity on length scales 5-150 nm which are often used host photoactive nano-materials device applications including dye-sensitized solar cells. In present study, AAO synthesized by using electrochemical methods a detailed characterization...

Dissecting aneurysm of the intracranial arteries is uncommon and isolated dissection middle cerebral artery (MCA) much rarer.Cerebral infarction usual presentation MCA in first two decades, hemorrhagic manifestation being rare.We describe a young male patient who presented with acute onset headache left sided hemiparesis due to intra-parenchymal hemorrhage.Digital subtraction angiography finally revealed involving M2 segment right as possible cause intracerebral hemorrhage this patient.This...

Interstitial lung disease (ILD) has been considered as an unusual pulmonary manifestation of systemic lupus erythematosus.Patients ILD usually present with progressive dry cough and exertional dyspnea.ILD is seen in long standing SLE patients follows a chronic course.ILD the initial very rare.Our middle aged female patient presented symptoms, renal impairment arthralgia.She was finally diagnosed having by relevant autoantibody profile biopsy along HRCT proven ILD.

Acute Inflammatory Demyelinating Polyradiculoneuropathy (AIDP) is usually preceded by infection with certain bacteria and viruses. Parasitic has rarely been reported as a causal factor for AIDP. Neurological manifestations following malaria commonly seen P. falciparum. There are only few case reports of Guillain–Barre Syndrome or facial diplegia vivax infection. Here we reporting patient who developed AIDP within two weeks successful treatment

In addition to discovering new antibiotics combat antibiotic resistance, there is a critical need develop novel strategies that could limit off-target effects and unnecessary exposure of bacteria in our body environment, respectively. We report set novel, photoswitchable arylazopyrazole-modified norfloxacin presents high degree bidirectional photoisomerization, impressive fatigue reasonably cis half-lives, exhibits antibacterial activity selectively against Gram-positive bacteria; the...