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Brandon J. N. Long
North Carolina State University
8Publications
1H-index
4Citations
Publications 8
Newest
#1Hans D. HallenH-Index: 21
#2Brandon J. N. LongH-Index: 1
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#1Hans D. Hallen (NCSU: North Carolina State University)H-Index: 21
#2Ling Li (NCSU: North Carolina State University)H-Index: 3
Last.Brandon J. N. Long (NCSU: North Carolina State University)H-Index: 1
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Methylation in DNA is a controlling factor in gene expression, embryonic development, and has been found to be important in infections and cancer. From a basic biology point of view, great heterogeneity has been found in methylation levels within tissues, so questions arises as to how and why. We show that methylated-DNA (m-DNA) can be distinguished from non-methylated (n-DNA) with nano-bowtie- and resonance- enhanced Raman spectra. By tuning the bowtie antenna to the resonance wavelength, both ...
Source
#1Brandon J. N. Long (NCSU: North Carolina State University)H-Index: 1
#2Wenxia Zheng (NCSU: North Carolina State University)H-Index: 11
Last.Hans D. Hallen (NCSU: North Carolina State University)H-Index: 21
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The discovery of soft structures in dinosaur bone with the morphological and molecular characteristics of blood vessels in extant vertebrates was both surprising and controversial. Mounting evidence suggests that these soft tissues are blood vessels, their preservation driven in part by reactive oxygen species derived from hemoglobin degradation. More data are needed to support this hypothesis. Raman spectroscopy, and resonance Raman in particular, can provide detailed information as to the chem...
1 CitationsSource
#1Garrett E. Pangle (NCSU: North Carolina State University)H-Index: 1
#2D. Adam Hook (NCSU: North Carolina State University)H-Index: 2
Last.Hans D. Hallen (NCSU: North Carolina State University)H-Index: 21
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The optical scattering from laser beams propagating through atmospheric aerosols has been shown to be very useful in describing air pollution aerosol properties. This research explores and extends that capability to particulate matter. The optical properties of Arizona Road Dust (ARD) samples are measured in a chamber that simulates the particle dispersal of dust aerosols in the atmospheric environment. Visible, near infrared, and long wave infrared lasers are used. Optical scattering measuremen...
Source
#1D. Adam Hook (NCSU: North Carolina State University)H-Index: 2
#2Garrett E. Pangle (NCSU: North Carolina State University)H-Index: 1
Last.Hans D. Hallen (NCSU: North Carolina State University)H-Index: 21
view all 5 authors...
Lidar is a powerful tool for measuring the vertical profiles of aerosols. Dusts are irregularly-shaped particles with varied composition and strong index of refraction variations in the LWIR. We measure dust indices using ellipsometry and transmission through KBr pellets. Milling makes the ellipsometry data less dependent on incidence angle, and the results of measurements on milled materials agree with those from transmission measurements. Measurements show that the spectrum of a milled Arizona...
1 CitationsSource
#1Hans D. Hallen (NCSU: North Carolina State University)H-Index: 21
#2Brandon J. N. Long (NCSU: North Carolina State University)H-Index: 1
Last.C. R. Philbrick (NCSU: North Carolina State University)H-Index: 2
view all 5 authors...
Lidar is a powerful tool for measuring the vertical profiles of aerosols in the atmosphere using Rayleigh and Raman lidar techniques. Bistatic lidar can be used to obtain the angular structure of the scattered light. When the aerosols are uniformly distributed, this information can be analyzed to provide particle size distribution information. However, dusts tend to be irregularly shaped particles with varied composition. We investigate the impact of the irregular shape using optical scattering ...
1 CitationsSource
#1Brandon J. N. Long (NCSU: North Carolina State University)H-Index: 1
#2D. A. Hook (NCSU: North Carolina State University)H-Index: 2
Last.C. Russell Philbrick (NCSU: North Carolina State University)H-Index: 9
view all 5 authors...
Aerosol optical scattering experiments are often large, expensive, and provide poor control of dust uniformity and size distribution. The size distribution of such suspended atmospheric aerosols varies rapidly in time, since larger particles settle quickly. Even in large chambers, 10 micron particles settle in tens of seconds. We describe lab-scale experiments with stable particle distributions. A viscous colloidal solution can stabilize the particles for sufficient time to measure optical scatt...
1 CitationsSource
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