Results 11 to 20 of about 221,298 (200)

Estratégias para aumento de sensibilidade em espectrofotometria UV-VIS Strategies to increase sensitivity in UV-VIS spectrophotometry

open access: yesQuímica Nova, 2004
Spectrophotometry is one of the most widespread analytical techniques due to its simplicity, reliability, and low-cost instrumentation for both direct measurements and coupled to other techniques or processes such as chromatography, electrophoresis and ...
Fábio R. P. Rocha   +1 more
doaj   +1 more source

Descriminant analysis of flowers, leaves, stems of combretum indicum varr.M and Varr.B with UV-vis spectrophotometric chemometric method [PDF]

open access: yesE3S Web of Conferences, 2023
Combertum indicum has two varieties, namely varr.M and Varr.B., so to maintain the truth of the sample it is necessary to discriminate. The way to distinguish these two varieties can use the UV-vis spectrophotometric approach.
Hadi Samsul   +2 more
doaj   +1 more source

ANALISA FLAVONOID DARI EKSTRAK ETANOL 96% KULIT BUAH OKRA MERAH (Abelmoschus esculentus L. Moench) SECARA KROMATOGRAFI LAPIS TIPIS DAN SPEKTROFOTOMETRI UV-VIS

open access: yesJIIS: Jurnal Ilmiah Ibnu Sina, 2016
Telah dilakukan penelitian tentang Analisa Flavonoid dari Ekstrak Etanol 96% Kulit Buah Okra Merah Secara Kromatografi Lapis Tipis dan Spektrofotometer UV-Vis.
Nia Lisnawati   +2 more
doaj   +3 more sources

A Real-Time Ultraviolet Radiation Imaging System Using an Organic Photoconductive Image Sensor

open access: yesSensors, 2018
We have developed a real time ultraviolet (UV) imaging system that can visualize both invisible UV light and a visible (VIS) background scene in an outdoor environment.
Toru Okino   +6 more
doaj   +1 more source

Predicting the UV–vis spectra of oxazine dyes

open access: yesBeilstein Journal of Organic Chemistry, 2011
In the current work we have investigated the ability of time-dependent density functional theory (TD-DFT) to predict the absorption spectra of a series of oxazine dyes and the effect of solvent on the accuracy of these predictions.
Scott Fleming, Andrew Mills, Tell Tuttle
doaj   +1 more source

Thermodynamic characterisation of triazol ylimino-DNA interaction by UV–Vis spectroscopy

open access: yesJournal of Photochemistry and Photobiology, 2020
To efficiently design improved therapeutic agent, study of molecule-DNA interaction is a crucial step. In our previous study, we investigated comprehensive mechanism of some 1,2,4 triazol-4-ylimino derivatives, and they exhibited excellent in vitro anti ...
Rafia Nimal, Afzal Shah, Muhammad Saddiq
doaj   +1 more source

Machine learning prediction of UV–Vis spectra features of organic compounds related to photoreactive potential

open access: yesScientific Reports, 2021
Machine learning (ML) algorithms were explored for the classification of the UV–Vis absorption spectrum of organic molecules based on molecular descriptors and fingerprints generated from 2D chemical structures.
Rafael Mamede   +2 more
doaj   +1 more source

The spectral resolution of DOM in urban rivers affected by different non-point source intensities using self-organizing maps

open access: yesWater Science and Technology, 2023
UV–Vis, three-dimensional excitation–emission matrix fluorescence spectroscopy (EEMs) and a self-organizing map (SOM) were used to study changes in the composition and constituent concentrations of dissolved organic matter (DOM) in the water column of ...
Xincheng Jin   +7 more
doaj   +1 more source

Classification of Makasar Fruit Extract (Brucea javanica L. Merr.) Based on The Level of Ripeness Using a Combination of FTIR and UV-Vis Spectroscopy with Chemometrics

open access: yesJurnal Kimia Sains dan Aplikasi, 2023
Makasar fruit (Brucea javanica L. Merr) is a medicinal plant frequently utilized in Indonesia for its anti-malarial, anti-diabetic, antioxidant, and antibacterial properties. This research aims to classify extracts from B.
Charles Banon   +5 more
doaj   +1 more source

Remote Sensing Observation of New Particle Formation Events with a (UV, VIS) Polarization Lidar

open access: yesRemote Sensing, 2019
Observations of new particle formation events in free troposphere are rather seldom and limited in time and space, mainly due to the complexity and the cost of the required on-board instrumentation for airplane field campaigns.
Alain Miffre   +3 more
doaj   +1 more source

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