scholarly journals Compact photothermal self-mixing interferometer for highly sensitive trace detection

2021 ◽  
Author(s):  
Zhen Huang ◽  
BEIQING Du ◽  
Zhenghe Zhang ◽  
YANTING Ye ◽  
SHIMIN HE ◽  
...  
Keyword(s):  
Trace Detection ◽  
Highly Sensitive

A superhydrophobic–superoleophilic plasmonic membrane for combined oil/water separation and highly-sensitive SERS detection of low concentrations of analytes in oil/water mixtures

2018 ◽  
Vol 42 (14) ◽  
pp. 11660-11664 ◽  
Author(s):  
Cheng Xu ◽  
Ding Cao ◽  
Wenya Lu ◽  
Jun Sun ◽  
Si Cheng
Keyword(s):  
Trace Detection ◽  
Water Separation ◽  
Low Concentrations ◽  
Highly Sensitive ◽  
Sers Detection ◽  
Oil Water Separation ◽  
Oil Water

Superhydrophobic–superoleophilic PS/AuAg ND mats were proven to exhibit integrated oil/water separation ability and act as SERS-active substrates for the trace detection of low concentrations of analyte molecules in oil/water mixtures.

Nano- and micro-hexagons of bismuth on polycrystalline copper: electrodeposition and heavy metal sensing

CrystEngComm ◽  
2014 ◽  
Vol 16 (10) ◽  
pp. 2032-2038 ◽  
Author(s):  
A. R. Rajamani ◽  
Udaya Bhaskar Reddy Ragula ◽  
Nikhil Kothurkar ◽  
Murali Rangarajan
Keyword(s):  
Heavy Metal ◽  
Polycrystalline Copper ◽  
Copper Electrodeposition ◽  
Trace Detection ◽  
Highly Sensitive ◽  
Heavy Metal Sensing ◽  
Metal Sensing

Tuning the electroreduction of NO3−vis-à-vis Bi3+ results in nano-/micro-hexagons. Nanohexagons are highly sensitive to trace detection of lead.

scholarly journals A Highly Sensitive Enzymatic Catalysis System for Trace Detection of Arsenic in Water

2017 ◽  
Vol 23 (43) ◽  
pp. 10289-10292 ◽  
Author(s):  
Yuanli Liu ◽  
Chuanbai Yu ◽  
Zhixin Cao ◽  
Daniel Shvarts ◽  
William C. Trogler
Keyword(s):  
Enzymatic Catalysis ◽  
Trace Detection ◽  
Highly Sensitive

Trace detection of explosives with a unique large volume injection gas chromatography-mass spectrometry (LVI-GC-MS) method

2018 ◽  
Vol 10 (23) ◽  
pp. 2712-2721 ◽  
Author(s):  
Dana Marder ◽  
Nitzan Tzanani ◽  
Hagit Prihed ◽  
Sigalit Gura
Keyword(s):  
Large Volume ◽  
Chemical Ionization ◽  
Gas Chromatography Mass Spectrometry ◽  
Trace Detection ◽  
Environmental Matrices ◽  
Large Volume Injection ◽  
Highly Sensitive ◽  
Detection Of Explosives ◽  
Related Compounds ◽  
Explosives And Related Compounds

Highly sensitive splitless programmed temperature vaporizing (PTV)-large volume injection (LVI)-GC-MS-negative chemical ionization (NCI) method was developed and validated for the trace detection of explosives and related compounds from environmental matrices.

Pump-Probe Photothermal Self-Mixing System for Highly Sensitive Trace Detection

2019 ◽  
Vol 19 (7) ◽  
pp. 2547-2552 ◽  
Author(s):  
Humberto Cabrera ◽  
Evelio E. Ramirez-Miquet ◽  
Jose J. Suarez-Vargas ◽  
John Fredy Barrera Ramirez ◽  
Dorota Korte ◽  
...  
Keyword(s):  
Trace Detection ◽  
Pump Probe ◽  
Highly Sensitive

Highly sensitive and selective fluorescence sensor based on nanoporous silicon-quinoline composite for trace detection of hydrogen peroxide vapors

2018 ◽  
Vol 276 ◽  
pp. 466-471 ◽  
Author(s):  
Brian P. Garreffi ◽  
Maolin Guo ◽  
Natalia Tokranova ◽  
Nathaniel C. Cady ◽  
James Castracane ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Fluorescence Sensor ◽  
Trace Detection ◽  
Nanoporous Silicon ◽  
Highly Sensitive

Ovarian Dysfunction in Fetally Irradiated Beagles

1977 ◽  
Vol 35 ◽  
pp. 658-659
Author(s):  
T. M. Seed ◽  
M. H. Sanderson ◽  
D. L. Gutzeit ◽  
T. E. Fritz ◽  
D. V. Tolle ◽  
...  
Keyword(s):  
Gamma Rays ◽  
Low Dose ◽  
Long Term Effects ◽  
Ovarian Dysfunction ◽  
Dose Rates ◽  
Highly Sensitive ◽  
Microscopic Evaluation ◽  
Ovarian Pathology ◽  
Normal Offspring

The developing mammalian fetus is thought to be highly sensitive to ionizing radiation. However, dose, dose-rate relationships are not well established, especially the long term effects of protracted, low-dose exposure. A previous report (1) has indicated that bred beagle bitches exposed to daily doses of 5 to 35 R 60Co gamma rays throughout gestation can produce viable, seemingly normal offspring. Puppies irradiated in utero are distinguishable from controls only by their smaller size, dental abnormalities, and, in adulthood, by their inability to bear young.We report here our preliminary microscopic evaluation of ovarian pathology in young pups continuously irradiated throughout gestation at daily (22 h/day) dose rates of either 0.4, 1.0, 2.5, or 5.0 R/day of gamma rays from an attenuated 60Co source. Pups from non-irradiated bitches served as controls. Experimental animals were evaluated clinically and hematologically (control + 5.0 R/day pups) at regular intervals.

Fluorescence ratio imaging of dynamic intracellular ionic signals

1988 ◽  
Vol 46 ◽  
pp. 42-43
Author(s):  
R. Y. Tsien ◽  
A. Minta ◽  
M. Poenie ◽  
J.P.Y. Kao ◽  
A. Harootunian
Keyword(s):  
Binding Sites ◽  
Living Cells ◽  
Molecular Engineering ◽  
Ph Indicators ◽  
Highly Sensitive ◽  
Fluorescence Ratio Imaging ◽  
Ratio Imaging ◽  
Technical Advances ◽  
Indicator Dyes ◽  
Fluorescein Dyes

Recent technical advances now enable the continuous imaging of important ionic signals inside individual living cells with micron spatial resolution and subsecond time resolution. This methodology relies on the molecular engineering of indicator dyes whose fluorescence is strong and highly sensitive to ions such as Ca2+, H+, or Na+, or Mg2+. The Ca2+ indicators, exemplified by fura-2 and indo-1, derive their high affinity (Kd near 200 nM) and selectivity for Ca2+ to a versatile tetracarboxylate binding site3 modeled on and isosteric with the well known chelator EGTA. The most commonly used pH indicators are fluorescein dyes (such as BCECF) modified to adjust their pKa's and improve their retention inside cells. Na+ indicators are crown ethers with cavity sizes chosen to select Na+ over K+: Mg2+ indicators use tricarboxylate binding sites truncated from those of the Ca2+ chelators, resulting in a more compact arrangement of carboxylates to suit the smaller ion.

Various technic for the measurement of step thickness on crystal surfaces

1978 ◽  
Vol 36 (1) ◽  
pp. 438-439
Author(s):  
C. Boulesteix ◽  
C. Colliex ◽  
C. Mory ◽  
B. Pardo ◽  
D. Renard
Keyword(s):  
Critical Thickness ◽  
Symmetric Case ◽  
Transmitted Intensity ◽  
Crystal Surfaces ◽  
Bright Field ◽  
Excited Wave ◽  
Highly Sensitive ◽  
Contrast Mechanisms ◽  
Step Thickness ◽  
Thickness Variations

Contrast mechanisms, which are responsible of the various types of image formation, are generally thickness dependant. In the following, two imaging modes in the 100 kV CTEM are described : they are highly sensitive to thickness variations and can be used for quantitative estimations of step heights.Detailed calculations (1) of the bright-field intensity have been carried out in the 3 (or 2N+l)-beam symmetric case. They show that in given conditions, the two important symmetric Bloch waves interfere most strongly at a critical thickness for which they have equal emergent amplitudes (the more excited wave at the entrance surface is also the more absorbed). The transmitted intensity I for a Nd2O3 specimen has been calculated as a function of thickness t. The capacity of the method to detect a step and measure its height can be more clearly deduced from a plot of dl/Idt as shown in fig. 1.

Estimation of the noise in TEM image recorded on “imaging plate”

1987 ◽  
Vol 45 ◽  
pp. 748-749
Author(s):  
T. Oikawa ◽  
N. Mori ◽  
T. Katoh ◽  
Y. Harada ◽  
J. Miyahara ◽  
...  
Keyword(s):  
Low Dose ◽  
Quantum Noise ◽  
Laser Light ◽  
Imaging Plate ◽  
Total System ◽  
Electron Dose ◽  
X Ray ◽  
Image Recording ◽  
Recording Material ◽  
Highly Sensitive

The “Imaging Plate”(IP) is a highly sensitive image recording plate for X-ray radiography. It has been ascertained that the IP has superior properties and high practicability as an image recording material in a TEM. The sensitivity, one of the properties, is about 3 orders higher than that of conventional photo film. The IP is expected to be applied to low dose techniques. In this paper, an estimation of the quantum noise on the TEM image which appears in case of low electron dose on the IP is reported.In this experiment, the JEM-2000FX TEM and an IP having the same size as photo film were used.Figure 1 shows the schematic diagram of the total system including the TEM used in this experiment. In the reader, He-Ne laser light is scanned across the IP, then blue light is emitted from the IP.

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