III–V nanowires for ammonia detection

Abstract Ammonia is an inorganic agent found both in nature and in the human body, which is of great interest for modern sensory applications. Here we use GaP, GaN and GaAs epitaxial nanowires as sensitive elements of the ammonia sensors fabricated via a simple protocol on the platform with golden interdigital contacts. Impedancemetry is used to study change of the device properties with addition of ammonia to the reference medium (water). GaP and GaN-based devices exhibit sufficient response to the ammonia presence with the detection limit lower than 10ppm. This work is aimed at fabrication and study of precise, technological and relatively cheap ammonia sensors compatible with a liquid medium, and motivated by the possibility of using this type of adsorption sensors in medical, environmental equipment and biological purposes.

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Silicon nanowires as multi—environment sensor elements for carbon monoxide and ammonia detection

Journal of Physics Conference Series ◽

10.1088/1742-6596/2015/1/012068 ◽

2021 ◽

Vol 2015 (1) ◽

pp. 012068

Author(s):

V. M. Kondratev ◽

I.A. Morozov ◽

E.A. Vyacheslavova ◽

A. S. Gudovskikh ◽

S. S. Nalimova ◽

...

Keyword(s):

Carbon Monoxide ◽

Liquid Medium ◽

Human Health ◽

Human Body ◽

Silicon Nanowires ◽

Ammonia Detection

Abstract Carbon monoxide and ammonia are inorganic agents found both in nature and in the human body, which is of great interest for modern sensing. First, in concentrations of the order of 1 ppm agents are produced by human and can be markers of changes in human health. Second, at concentrations of the order of 100 ppm, carbon monoxide and ammonia are toxic and hazardous. This work is aimed at fabrication and study of precise, technological and relatively cheap sensors compatible with a gas and liquid medium for CO and NH3 detection, respectively.

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Electronic nano sponge breath ammonia sensors using hygroscopic polymers on vertical channel nano-porous structure

Journal of Materials Chemistry C ◽

10.1039/d1tc01607e ◽

2021 ◽

Vol 9 (37) ◽

pp. 12938-12950

Author(s):

Wei-Lun Chen ◽

Huang-Cheng Chiu ◽

Hsuan Chu ◽

Ju-Chun Hsieh ◽

Bing-Xin Chen ◽

...

Keyword(s):

Porous Structure ◽

Low Cost ◽

Vertical Channel ◽

Gas Absorption ◽

Ammonia Gas ◽

Highly Sensitive ◽

Ammonia Detection ◽

Ammonia Sensors

With the low-cost hygroscopic polymers as the sensing layer of the nano-porous devices, the “Nano Sponge sensors” enable efficient and reversible ammonia gas absorption to realize highly sensitive and stable ammonia detection.

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A 2-Hydroxy-1-Naphthaldehyde Schiff Base for Turn-on Fluorescence Detection of Zn2+ based on PET Mechanism

10.21203/rs.3.rs-285879/v1 ◽

2021 ◽

Author(s):

Xinyue Mu ◽

Liping Shi ◽

Liqiang Yan ◽

Ningli Tang

Keyword(s):

Schiff Base ◽

Detection Limit ◽

Human Body ◽

Rapid Detection ◽

Zinc Ion ◽

Living Cells ◽

Quantitative Detection ◽

Real Samples ◽

Turn On ◽

Low Cytotoxicity

Abstract Zinc ion is closely related to human health. Its content in human body is small, while the effect is large. However, it is not the more the better, must be in a scientific balance. Therefore, it is significant to the rapid detection of Zn2+ in the environment and organism. Herein, a fluorescent probe based on 2-hydroxy-1-naphthalene formaldehyde and furan-2-carbohydrazide was conveniently synthesized via Schiff base reaction. And this probe has been successfully applied to the accurate and quantitative detection of Zn2+ in real samples, showing turn on fluorescence, good selectivity, very low detection limit, real time response and reusability. In addition, this probe has the potential application to trace Zn2+ in living cells with low cytotoxicity.

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Ammonia Detection at Low Temperature by Tungsten Oxide Nanowires

Proceedings ◽

10.3390/proceedings2130983 ◽

2018 ◽

Vol 2 (13) ◽

pp. 983 ◽

Cited By ~ 1

Author(s):

Sandrine Bernardini ◽

Florent Pourcin ◽

Nassirou Nambiema ◽

Olivier Margeat ◽

Khalifa Aguir ◽

...

Keyword(s):

Gas Sensors ◽

Tungsten Trioxide ◽

Tin Dioxide ◽

Thermal Strain ◽

Oxide Nanowires ◽

Interesting Approach ◽

Ammonia Detection ◽

Ammonia Sensors ◽

Monitoring Devices ◽

Semiconducting Metal Oxide

Ammonia detection at low temperatures below 150 °C is attractive to be well suited for flexible substrates in terms of thermal strain and to specific environment not allowing high temperature such as explosive one. In commercial gas sensors, tungsten trioxide is the mostly used semiconducting metal oxide after tin dioxide. We report herein the efficiency of tungsten trioxide nanowires deposited on rigid substrate by drop coating from colloidal solution. This study provides an interesting approach to fabricate ammonia sensors on conformable substrate with significant properties for applications in environmental monitoring devices.

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СОДЕРЖАНИЕ ТЯЖЕЛЫХ МЕТАЛЛОВ В ЖИРНЫХ МАСЛАХ И МАСЛЯНЫХ ЭКСТРАКТАХ

10.25230/conf11-2021-32-35 ◽

2021 ◽

Author(s):

M.S. Galenko ◽

Keyword(s):

Heavy Metals ◽

Detection Limit ◽

Atomic Absorption ◽

Absorption Spectroscopy ◽

Vegetable Oils ◽

Human Body ◽

Atomic Absorption Spectroscopy ◽

Lead Content ◽

Industrial Emissions

Due to the tendency to an increase in industrial emissions into the environment and pollution of flora and fauna with various ecotoxicants, we studied the samples of vegetable oils for the content of heavy metals (Pb, Cd, Cu, Fe) by the method of atomic absorption spectroscopy (AAS). We established that the content of the determined elements was in the range from 0.037–1.474 mg/kg, we also found that in 20 % of the samples the lead content was below the method’s detection limit. Based on the obtained data, we calculated the possible intake of heavy metals into the human body with these oils and we evaluated the safety of their use.

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Microparticle-enhanced nephelometric immunoassay of lysozyme in milk and other human body fluids

Clinical Chemistry ◽

10.1093/clinchem/44.8.1610 ◽

1998 ◽

Vol 44 (8) ◽

pp. 1610-1615 ◽

Cited By ~ 18

Author(s):

Paul Montagne ◽

Marie Louise Cuillière ◽

Claire Molé ◽

Marie Christine Béné ◽

Gilbert Faure

Keyword(s):

Detection Limit ◽

Human Milk ◽

Human Body ◽

Total Protein ◽

Sample Pretreatment ◽

Body Fluids ◽

Mature Milk ◽

Coefficients Of Variation ◽

Lysozyme Concentration

Abstract Quantitation of lysozyme in human milk was performed by a microparticle-enhanced nephelometric immunoassay based on the measurement of the light scattered during the competitive immunoagglutination of a microparticle–lysozyme conjugate with an anti-lysozyme antiserum. This immunoassay has a detection limit of 8 μg/L of reaction mixture and can be performed using diluted milk (1:6000, in reaction mixture), excluding sample pretreatment. Human milk lysozyme can be quantified over the concentration range 0.09–1.50 g/L, with within- and between-run coefficients of variation <5%. Changes in the lysozyme concentration of human milk during lactation were determined in 636 samples. Lysozyme concentrations (mean ± SE) decreased from colostrum (0.36 ± 0.02 g/L) to transitional milk (0.30 ± 0.01 g/L) and mature milk during days 15–42 (0.30 ± 0.01 g/L), then increased in the mature milk during days 43–56 (0.35 ± 0.01 g/L) and especially during days 57–84 (0.83 ± 0.05 g/L). The proportion of lysozyme contributing to total protein was found to rise during lactation and was as follows: colostrum (1.7%), transitional milk (2.3%), and mature milk from days 15–28 (2.7%), days 29–42 (3.1%), days 43–56 (3.8%), and days 57–84 (7.3%). The assay developed for milk was also suitable for the determination of lysozyme in other human body fluids.

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Silicon nanowires based adsorption sensors for CO and NH3 detection

Journal of Physics Conference Series ◽

10.1088/1742-6596/2103/1/012229 ◽

2021 ◽

Vol 2103 (1) ◽

pp. 012229

Author(s):

V M Kondratev ◽

I A Morozov ◽

E A Vyacheslavova ◽

A S Gudovskikh ◽

S S Nalimova ◽

...

Keyword(s):

Carbon Monoxide ◽

Liquid Medium ◽

Surface Area ◽

Human Body ◽

Silicon Nanowires ◽

High Surface ◽

High Surface Area ◽

Si Nanowires

Abstract Carbon monoxide and ammonia are inorganic agents found both in nature and in the human body, which is of great interest for modern sensing. The work is aimed at fabrication and study of precise, technological and relatively cheap multi-environment sensors based on Si nanowires possessing high surface area compatible with a gas and liquid medium for CO and NH3 detection, respectively. We demonstrate the potential of the approach for detection of both ammonia and CO at concentrations as low as 10ppm. The effects of the adsorbates from water and air are discussed.

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Microstructural comparison of synthetic bioceramics with natural bioceramics

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100084491 ◽

1991 ◽

Vol 49 ◽

pp. 38-39

Author(s):

Shulin Wen ◽

Jingwei Feng ◽

A. Krajewski ◽

A. Ravaglioli

Keyword(s):

Recent Work ◽

Human Body ◽

Human Tissues ◽

Main Constituent ◽

Laboratory Furnace ◽

Chinese Adult ◽

Human Enamel ◽

Biological Compatibility ◽

Synthetic Hydroxyapatite ◽

Synthetic Work

Hydroxyapatite bioceramics has attracted many material scientists as it is the main constituent of the bone and the teeth in human body. The synthesis of the bioceramics has been performed for years. Nowadays, the synthetic work is not only focused on the hydroapatite but also on the fluorapatite and chlorapatite bioceramics since later materials have also biological compatibility with human tissues; and they may also be very promising for clinic purpose. However, in comparison of the synthetic bioceramics with natural one on microstructure, a great differences were observed according to our previous results. We have investigated these differences further in this work since they are very important to appraise the synthetic bioceramics for their clinic application.The synthetic hydroxyapatite and chlorapatite were prepared according to A. Krajewski and A. Ravaglioli and their recent work. The briquettes from different hydroxyapatite or chlorapatite powders were fired in a laboratory furnace at the temperature of 900-1300°C. The samples of human enamel selected for the comparison with synthetic bioceramics were from Chinese adult teeth.

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Study on erythrocytes by SEM photogrammetry (SEMP) technique

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100161187 ◽

1990 ◽

Vol 48 (3) ◽

pp. 724-725

Author(s):

Tong Wensheng ◽

Lu Lianhuang ◽

Zhang Zhijun

Keyword(s):

Quantitative Analysis ◽

Cell Membrane ◽

Clinical Diagnosis ◽

Human Body ◽

Blood Cells ◽

Three Dimensional ◽

Normal Person ◽

Blood Disease ◽

Computation Technique ◽

Important Basis

This is a combined study of two diffirent branches, photogrammetry and morphology of blood cells. The three dimensional quantitative analysis of erythrocytes using SEMP technique, electron computation technique and photogrammetry theory has made it possible to push the study of mophology of blood cells from LM, TEM, SEM to a higher stage, that of SEM P. A new path has been broken for deeply study of morphology of blood cells.In medical view, the abnormality of the quality and quantity of erythrocytes is one of the important changes of blood disease. It shows the abnormal blood—making function of the human body. Therefore, the study of the change of shape on erythrocytes is the indispensable and important basis of reference in the clinical diagnosis and research of blood disease.The erythrocytes of one normal person, three PNH Patients and one AA patient were used in this experiment. This research determines the following items: Height;Length of two axes (long and short), ratio; Crevice in depth and width of cell membrane; Circumference of erythrocytes; Isoline map of erythrocytes; Section map of erythrocytes.

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