3,039 results match your criteria measured spectrophotometer


Colorimetric determination of trace orthophosphate in water by using C-functionalized silica coated magnetite.

Sci Rep 2021 Nov 29;11(1):23073. Epub 2021 Nov 29.

Department of Chemistry, Faculty of Science and Technology, Thammasat University, Pathumthani, 12120, Thailand.

In this study, we customized magnetic sorbents by functionalizing silica coated magnetite with octadecyl(C)silane ([email protected]@C). This sorbent was intended for the determination of trace orthophosphate (o-PO) in unpolluted freshwater samples. The o-PO was transformed to phosphomolybdenum blue (PMB), a known polyoxometalate ion. Read More

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November 2021

Mycoremediation of reactive red HE7B dye by Aspergillus salinarus isolated from textile effluents.

Curr Res Microb Sci 2021 Dec 2;2:100056. Epub 2021 Aug 2.

Department of Biotechnology and Genetic Engineering, Faculty of Biological Sciences, Islamic University, Kushtia 7003, Bangladesh.

Reactive dyes are widely utilized in the textile industry due to their advantageous properties of vivid color, water-fastness, and simple application procedures with minimal energy usage. The toxicity of most azo dyes is a significant environmental concern, as effluents from dye processing and manufacturing sectors are known to be carcinogenic and mutagenic to numerous species. These issues are more grievous in Bangladesh, one of the largest exporters of apparel. Read More

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December 2021

Carcinogens in Food: Evaluating the Presence of Cadmium, Lead, in Poultry Meat in South India.

Asian Pac J Cancer Prev 2021 11 1;22(11):3507-3511. Epub 2021 Nov 1.

School of Engineering, Shanghai Jiao Tong University, Shanghai 200241, China.

Objective: Local chickens were spontaneously sampled and slaughtered in the central markets of Coimbatore, Erode, and Namakkal districts, South India.

Materials And Methods: Wet digestion was used to extract lead (Pb), cadmium (Cd), and zinc (Zn) in their blood and selected different organs (intestine, breast, liver, and gizzard), and their concentrations were measured using an atomic absorption spectrophotometer.

Results: Apart from the blood of chickens from Coimbatore and Namakkal, where Pb was not found, the concentrations of Pb in the blood and organs of chickens from the three towns ranged from 1. Read More

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November 2021

Alcaligenes faecalis metallo-β-lactamase in extensively drug-resistant Pseudomonas aeruginosa isolates.

Clin Microbiol Infect 2021 Nov 23. Epub 2021 Nov 23.

Department of Infectious Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China; Key Laboratory of Microbial Technology and Bioinformatics of Zhejiang Province, Hangzhou, China; Regional Medical Center for National Institute of Respiratory Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China. Electronic address:

Objectives: This study aimed to characterize Alcaligenes faecalis metallo-β-lactamases AFM-2 and AFM-3 from clinical P. aeruginosa isolates NDTH10366, NDTH9845 and WTJH17.

Methods: Clinical isolates were whole-genome sequenced using the Illumina and Oxford Nanopore platforms. Read More

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November 2021

Tocopherol contents and antioxidant activity in grape pomace after fermentation and alcohol distillation.

Cell Mol Biol (Noisy-le-grand) 2021 Jan 31;67(1):112-115. Epub 2021 Jan 31.

Institute of Ethnobiology and Socio-Ecology, Ilia State University, Tbilisi, Georgia.

The wine industry in Georgia produces vast amounts of grape pomace that is currently mostly wasted, while only a minor amount is used for distilling alcohol. The study was carried out on the grape pomace from the three most widely used grapevine sorts (Vitis vinifera var. Rkatsiteli, V. Read More

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January 2021

Primary facility for traceable measurement of the BSSRDF.

Opt Express 2021 Oct;29(21):34175-34188

The bidirectional scattering-surface reflectance distribution function (BSSRDF) is the function that describes the variation of the radiance of the elementary areas of a surface with respect to the directionally incident radiant flux on that surface. Measurements of the BSSRDF are important for characterizing the translucency of objects and for obtaining those optical parameters affecting volume scattering. However, to date, no traceable measurements of this function are available, since, likely due to its technical complexity, no standard measurement procedure has been established. Read More

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October 2021

Influence of Different Beverages on the Color Stability of Nanocomposite Denture Base Materials.

Int J Dent 2021 11;2021:5861848. Epub 2021 Nov 11.

Department of Removable Prosthodontics, Faculty of Dental Medicine, Al-Azhar University, AlmokhyamAldaem St., Nasr Road, 11884 Nasr City, Cairo, Egypt.

Background: The effect of beverages on nanocomposite denture base materials is neglected. Therefore, this study aimed to investigate the influence of different beverages (coffee, tea, cola, and mineral water) on the color stability of nanoparticles-modified denture base materials (DBMs).

Materials And Methods: A total of 280 specimens ( = 10/group) were prepared from heat-polymerized acrylic resin modified with different concentrations (3% and 7%) of zirconium dioxide (nano-ZrO), titanium dioxide (nano-TiO), and silicon dioxide (nano-SiO) nanoparticles, while 0% was taken as a control. Read More

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November 2021

Circulating Immunosuppressive Regulatory T Cells Predict Risk of Incident Cutaneous Squamous Cell Carcinoma.

Front Med (Lausanne) 2021 2;8:735585. Epub 2021 Nov 2.

Department of Immunology, Moffitt Cancer Center, Tampa, FL, United States.

Ultraviolet radiation exposure (UVR) is a risk factor for cutaneous squamous cell carcinoma (cuSCC) and has been shown to be positively associated with circulating immunosuppressive regulatory T cells ("Tregs"). However, the risk of cuSCC in association with circulating Tregs has not been studied. The aim of this study was to determine whether circulating Treg levels are associated with cuSCC development, particularly in the context of high UVR. Read More

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November 2021

The Value of Serum Adiponectin in Osteoporotic Women: Does Weight Have an Effect?

J Obes 2021 9;2021:5325813. Epub 2021 Nov 9.

Ministry of Education, Directorate of Education Thi-Qar, Nasiriyah, Thi-Qar 64001, Iraq.

Osteoporosis (OP) has been observed to have a deleterious effect on postmenopausal women's life quality by increasing the risk of fragility fractures. The current research was adopted to verify the role of serum adiponectin, a cytokine released by adipose tissue, as a marker for OP across different body mass index groups, for a better understanding of fatty tissue role in OP. A case-control study recruited 210 eligible postmenopausal women and subgrouped into three groups based on their DEXA scan results: osteoporotic group, osteopenia group, and healthy controls; each includes 70 patients. Read More

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November 2021

Corneal riboflavin gradients and UV-absorption characteristics after topical application of riboflavin in concentrations ranging from 0.1 to 0.5.

Exp Eye Res 2021 Nov 16;213:108842. Epub 2021 Nov 16.

Laser Zentrum Hannover e.V, Hanover, Germany.

Avoiding damage of the endothelial cells, especially in thin corneas, remains a challenge in corneal collagen crosslinking (CXL). Knowledge of the riboflavin gradients and the UV absorption characteristics after topical application of riboflavin in concentrations ranging from 0.1% to 0. Read More

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November 2021

Can ozone or violet light improve the color change or physicochemical properties of hydrogen peroxide-bleached tooth?

Braz Dent J 2021 Jul-Aug;32(4):19-30

Department of Operative Dentistry and Dental Materials, Dental School, Federal University of Uberlândia(UFU), Uberlândia, Minas Gerais, Brazil.

This study investigated the bleaching effectiveness and the physicochemical effects on enamel of violet light and ozone, associate or not to hydrogen peroxide, compared to 35%-hydrogen peroxide. Enamel-dentin blocks from human molars were randomly allocated to receive one of the following bleaching protocols (n=15): (HP) 35%-hydrogen peroxide, (VL) violet light, (OZ) ozone, the association between hydrogen peroxide with ozone (OZ+HP) or violet light (VL+HP). All protocols were performed in two sessions with a 48h interval. Read More

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November 2021

Carboplatin- and Etoposide-Loaded Lactoferrin Protein Nanoparticles for Targeting Cancer Stem Cells in Retinoblastoma In Vitro.

Invest Ophthalmol Vis Sci 2021 Nov;62(14):13

School of Medical Sciences, University of Hyderabad, Hyderabad, India.

Purpose: Cancer stem cells (CSCs) are known to contribute to tumor relapses by virtue of their chemoresistance. With the knowledge that nanoformulations can overcome drug resistance, we evaluated the efficacy and cytotoxicity of clinical-grade carboplatin (CPT)- and etoposide (ETP)-loaded lactoferrin nanoparticles (Lf-Nps) on total, CD133-enriched (non-CSC), and CD133-depleted (CSC) populations of retinoblastoma (Rb) Y79 cells.

Methods: Physicochemical properties of drug-loaded Lf-Nps were measured with transmission electron microscopy and attenuated total reflectance-Fourier transform infrared. Read More

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November 2021

Titania Nanotube Architectures Synthesized on 3D-Printed Ti-6Al-4V Implant and Assessing Vancomycin Release Protocols.

Materials (Basel) 2021 Nov 1;14(21). Epub 2021 Nov 1.

M3D Laboratory, Advanced Materials Analysis Research Unit, Department of Metallurgical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand.

The aim of this study is to synthesize Titania nanotubes (TNTs) on the 3D-printed Ti-6Al-4V surface and investigate the loading of antibacterial vancomycin drug dose of 200 ppm for local drug treatment application for 24 h. The antibacterial drug release from synthesized nanotubes evaluated via the chemical surface measurement and the linear fitting of Korsmeyer-Peppas model was also assessed. The TNTs were synthesized on the Ti-6Al-4V surface through the anodization process at different anodization time. Read More

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November 2021

Metal ion chelation enhances tissue plasminogen activator (tPA)-induced thrombolysis: an in vitro and in vivo study.

J Thromb Thrombolysis 2021 Nov 10. Epub 2021 Nov 10.

Department of Biomedical Sciences, Ohio Heritage College of Osteopathic Medicine, Ohio University, 346 Irvine Hall, Athens, OH, 45701, USA.

Stroke is the third leading cause of death in the United States and the leading cause of adult disability. Despite enormous research efforts including many clinical trials, tissue plasminogen activator (tPA) remains the only FDA-approved treatment for acute ischemic stroke. Unfortunately, only 1-3% of stroke patients in the US receive this therapy because of the narrow time window and severe side effects for using tPA. Read More

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November 2021

Point of care test technology suitable for early detection and monitoring of ischemic stroke.

Curr Neurovasc Res 2021 Nov 8. Epub 2021 Nov 8.

Clinical Omics Institute, Kyungpook National University, Daegu 41405. Korea.

Background: Stroke is one of the leading causes of death and disability in adulthood worldwide. A simple and convenient diagnostic method is needed for monitoring high-risk patients for stroke. Few POCTs are available for stroke diagnosis. Read More

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November 2021

An objective skin-type classification based on non-invasive biophysical parameters.

J Eur Acad Dermatol Venereol 2021 Nov 8. Epub 2021 Nov 8.

Department of Dermatology, School of Medicine, Kyung Hee University, Seoul, Korea.

Background: Despite the invention of various non-invasive bioengineering tools, skin-type analysis has largely been based on subjective assessments. However, advancements in the functional cosmetic industry and artificial intelligence-assisted dermatology are creating a greater demand for an objective skin-type classification system.

Objectives: To propose an objective skin-type classification system solely based on non-invasive, bioengineering devices; provide reference values applicable to the Korean population; and compare our reference values with those of published studies. Read More

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November 2021

Comparative spectrophotometer analysis of ultraviolet-light filtering, blue light-filtering and violet-light filtering intraocular lenses.

Korean J Ophthalmol 2021 Nov 8. Epub 2021 Nov 8.

Department of Ophthalmology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.

Purpose: To compare the light transmittance property of 7 currently used intraocular lens models (IOLs) by spectrophotometer data.

Materials And Methods: Light-transmission spectra of 7 IOL models were assessed with a spectrophotometer. The transmittance properties were analyzed in 1 nm units from 350 nm wavelength to 800 nm. Read More

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November 2021

Design and optimization of sensitive analytical spectrophotometric method for micro determination of copper(II) from e-waste by using of novel chromogenic extractant.

Spectrochim Acta A Mol Biomol Spectrosc 2021 Oct 23;267(Pt 1):120502. Epub 2021 Oct 23.

Department of Engineering Chemistry, Kolhapur Institute of Technology's College of Engineering (Autonomous), Kolhapur, Affiliated to Shivaji University, Kolhapur 416234, India; Shri Jagdishprasad Jhabarmal Tibrewala University, Vidyanagari, Rajasthan 333001, India. Electronic address:

In this article, a novel spectrophotometric reagent 1-(pyrimidine)-4, 4, 6-trimethyl-1,4-dihydropyrimidine-2-thiol [PTPT] has been synthesized for liquid-liquid extraction and spectrophotometric determination of copper(II). The as-synthesized ligand has been selectively forms stable complex with copper(II) in basic medium (pH 9.0), in presence of mild pyridine the extraction and color stability has found to be synergistically enhanced. Read More

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October 2021

Effects of surface treatments and abutment shades on the final color of high-translucency self-glazed zirconia crowns.

J Prosthet Dent 2021 Oct 25. Epub 2021 Oct 25.

Associate Professor, Department of General Dentistry, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, PR China. Electronic address:

Statement Of Problem: Achieving excellent esthetics with monolithic self-glazed zirconia crowns in anterior teeth is challenging, and the impact of different surface treatments and abutment shades on the final color is unclear.

Purpose: The purpose of this in vitro study was to evaluate the effects of different external surface treatments (self-glazed, milled, polished, and glazed), different intaglio surface treatments (milled and airborne-particle abraded), and different abutment shades on the color difference of high-translucency self-glazed zirconia crowns.

Material And Methods: Sixty shade A1 and 60 shade A3 crowns were fabricated with a thickness of 0. Read More

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October 2021

A Simple Route to the Complexation of Lutein with Reduced Graphene Oxide Nanocarriers and Antioxidant Protection Against Blue Light.

Int J Nanomedicine 2021 7;16:6843-6860. Epub 2021 Oct 7.

Department of Cogno-Mechatronics Engineering, Department of Optics and Mechatronics Engineering, College of Nanoscience and Nanotechnology, Pusan National University, Busan, 46241, Republic of Korea.

Background: The excellent physicochemical properties of graphene-based materials, including graphene oxide (GO) and reduced GO (rGO), offer significant technological potential as multifunctional nanomaterials in biomedical fields. Lutein is a type of carotenoid that forms human macular pigments in the retina, where it inhibits harmful blue light and contributes to the strengthening of the antioxidant defense of retinal pigment epithelium cells.

Methods: Synthesis of the Lutein-rGO (Lu-rGO) complex was carried out for the optimized concentration. Read More

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November 2021

Melanogenesis-promoting effect of Cirsium japonicum flower extract in vitro and ex vivo.

Int J Cosmet Sci 2021 Oct 21. Epub 2021 Oct 21.

Biospectrum Life Science Institute, Yongin-si, Republic of Korea.

Objective: In this study, we examined the effect of C. japonicum flower extract (CFE) on melanogenesis and its mechanism in vitro and ex vivo.

Methods: The effect of CFE on melanogenesis was investigated with lightly (HEMn-LP) and moderately (HEMn-MP) pigmented normal human melanocytes, reconstituted three-dimensional skin (3D skin) model and ex vivo human hair follicles. Read More

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October 2021

Effect of external staining on the optical properties and surface roughness of monolithic zirconia of different thicknesses.

J Prosthet Dent 2021 Nov 14;126(5):687.e1-687.e8. Epub 2021 Oct 14.

Predoctoral student, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.

Statement Of Problem: The effect of the number of external staining applications on the color, translucency, and surface roughness of monolithic zirconia is not known.

Purpose: The purpose of this in vitro study was to investigate the effect of glazing and repeated external staining on the color, translucency, and surface roughness of 2 types of monolithic zirconia with 2 different thicknesses.

Material And Methods: Thirty-two 10×10-mm monolithic zirconia blocks, of which 16 were super high translucent and 16 were high translucent, were milled. Read More

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November 2021

Dry Powder Mixing Is Feasible in Continuous Twin Screw Extruder: Towards Lean Extrusion Process for Oral Solid Dosage Manufacturing.

AAPS PharmSciTech 2021 Oct 14;22(7):249. Epub 2021 Oct 14.

Operations Science and Technology, AbbVie, Illinois, North Chicago, 60064, USA.

Using discrete element method (DEM) modeling and near-infrared (NIR) spectroscopy, the feasibility of powder mixing in the initial pre-melting zones of a twin screw extruder using two independent feeders was studied. Previous work in the pharmaceutical and food industry has focused on mixing when materials are melted or on material homogeneity at the extruder's output. Depending on the formulation, ensuring a fully blended formulation prior to melting may be desired. Read More

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October 2021

Layered Double Hydroxide (MgFeAl-LDH)-Based Polypropylene (PP) Nanocomposite: Mechanical Properties and Thermal Degradation.

Polymers (Basel) 2021 Oct 8;13(19). Epub 2021 Oct 8.

Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany.

This work analyzes the thermal degradation and mechanical properties of iron (Fe)-containing MgAl layered double hydroxide (LDH)-based polypropylene (PP) nanocomposite. Ternary metal (MgFeAl) LDHs were prepared using the urea hydrolysis method, and Fe was used in two different concentrations (5 and 10 mol%). Nanocomposites containing MgFeAl-LDH and PP were prepared using the melt mixing method by a small-scale compounder. Read More

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October 2021

Optical Detection of SARS-CoV-2 Utilizing Antigen-Antibody Binding Interactions.

Sensors (Basel) 2021 Oct 2;21(19). Epub 2021 Oct 2.

Zayed Center for Health Sciences, United Arab Emirates University, Al Ain 15551, United Arab Emirates.

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the virus responsible for the coronavirus disease (COVID-19) pandemic, is sweeping the world today. This study investigates the optical detection of SARS-CoV-2, utilizing the antigen-antibody binding interactions utilizing a light source from a smart phone and a portable spectrophotometer. The proof-of-concept is shown by detecting soluble preparations of spike protein subunits from SARS-CoV-2, followed by detection of the actual binding potential of the SARS-CoV-2 proteins with their corresponding antigens. Read More

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October 2021

Spectral Transmission of the Human Corneal Layers.

J Clin Med 2021 Sep 29;10(19). Epub 2021 Sep 29.

Anterior Segment and Cornea and External Eye Diseases Unit, FISABIO-Oftalmología Médica (FOM), Av. Pío Baroja, 12, E-46015 Valencia, Spain.

We have assessed the spectral transmittance of the different layers of the human cornea in the ultraviolet (UV), visible, and near-infrared (IR) spectral ranges. Seventy-four corneal sample donors were included in the study. Firstly, the corneal transmittance was measured using a spectrophotometer. Read More

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September 2021

Evaluation of salivary thiobarbituric acid reactive substances, total protein, and pH in children with various degrees of early childhood caries: a case-control study.

Eur Arch Paediatr Dent 2021 Dec 9;22(6):1095-1099. Epub 2021 Oct 9.

Oral Health Research Center, Health Research Institute, Babol University of Medical Sciences, Gnjafrooz St., Babol, Mazandaran, 47176-47745, I.R. of Iran.

Purpose: According to new studies, oxidative stress may play an important role in the beginning and progression of oral diseases. The aim of this study was the evaluation of thiobarbituric acid reactive substances (TBARS) as an indicator of lipid peroxidation, total protein, and pH of saliva in children with various degrees of early childhood caries in comparison with caries-free children.

Methods: This case-control study was carried out on 90 children 3-5 years old in three equal groups, including caries-free children (CF), early childhood caries (ECC), and severe early childhood caries (S-ECC) who were age- and sex matched. Read More

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December 2021

A Simple and Cost-Effective Method for Measuring Hemolysis in Biobank Serum Specimens.

Biopreserv Biobank 2021 Oct 5. Epub 2021 Oct 5.

Department of Research, Cancer Registry of Norway, Oslo, Norway.

During sampling and processing, blood samples can be affected by hemolysis. Information is lacking regarding hemolysis for biobank samples. There is a need for a method that can easily measure hemoglobin as an indicator of hemolysis in stored samples before they are included in research projects. Read More

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October 2021

Serum intracellular adhesion molecule-1 and interleukin-8 as predictors of pulmonary impairment among workers in secondary copper smelters.

Int Arch Occup Environ Health 2021 Oct 5. Epub 2021 Oct 5.

Occupational and Environmental Medicine Department, Faculty of Medicine, Cairo University, Giza, Egypt.

Objective: Copper smelter workers are exposed to harmful chemical agents in dust and fumes which contain harmful metals such as copper and arsenic. These substances are known to be respiratory irritants.

Methods: This study aimed at investigating the effect of occupational exposure to copper and arsenic on the respiratory system. Read More

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October 2021

Fabrication of spectroscopic characterization techniques using an optical fiber-based spectrometer.

Rev Sci Instrum 2021 Sep;92(9):093104

Postgraduate Program in Interdisciplinary Health Science, Campus Baixada Santista, Federal University of São Paulo, CEP 11070-100 Santos, SP, Brazil.

High-sensitive spectroscopy instruments have been developed to measure thermoluminescence emission (TLE), diffuse reflectance, and photoluminescence (PL). The key features of these instruments are low cost, high resolution, and compact size. For TLE measurement, A Kanthal resistive heating strip with a linear heating rate and Ocean Optics spectra suite software were used. Read More

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September 2021