Results 141 to 150 of about 3,161,795 (320)
Evidence for periodicities in the extinction record? Response to Melott & Bambach [arXiv:1307.1884] [PDF]
arXiv, 2013 In a recent paper, we applied time series analysis methods to study the possible influence of the solar motion through the Galaxy on terrestrial extinction (Feng & Bailer-Jones 2013). We drew conclusions about the relative probabilities of how well different models explain the geological extinction record.
arxiv
State of the Art of Low‐Frequency Acoustic Modulation: Intensity Enhancement and Directional Control
Advanced Science, EarlyView.High intensity low‐frequency sound sources hold significant value in many fields. However, their long wavelength, strong penetrability, and tendency to diffract make direction control and intensity enhancement challenging. Acoustic generators and metamaterial‐based acoustic devices still face issues such as low energy efficiency, poor directional ...
Jingsong Xu +13 more
wiley +1 more source
Scaling laws in the evolutionary processes of marine animals over the last 540 million years
Geosystems and GeoenvironmentScaling laws are ubiquitous in modern biological systems. However, whether such patterns existed in deep-time biological systems is less investigated; the best-known example is the scaling law between the frequency and size of extinction events.
Haitao Shang
doaj
Possible detection of atmospheric bioaerosol via LiDAR: a wavelength-based simulation study
Asian Journal of Atmospheric EnvironmentThis study explores potential of LiDAR technology to rapidly detect aerosolized biological terror agents in the atmosphere. It assesses the application by simulating extinction coefficients and the Ångström exponent at various wavelengths (266, 1064 ...
Juseon Shin, Youngmin Noh
doaj +1 more source
Maximal Sensitive Dependence and the Optimal Path to Epidemic Extinction [PDF]
arXiv, 2010 Extinction of an epidemic or a species is a rare event that occurs due to a large, rare stochastic fluctuation. Although the extinction process is dynamically unstable, it follows an optimal path that maximizes the probability of extinction. We show that the optimal path is also directly related to the finite-time Lyapunov exponents of the underlying ...
arxiv
Direct Quantification of Protein–Protein Interactions in Living Bacterial Cells
Advanced Science, EarlyView.Quantitative measurement of protein–protein interactions in living cells is vital for biotechnology applications. Fluorescence resonance energy transfer (FRET) signals in bacterial cells are often weak, leading to false‐positive. Quantitative FRET measurements are implemented to overcome the weak FRET signal.
Soojung Yi +12 more
wiley +1 more source
Extinção e o Registro Fóssil [PDF]
Anuário do Instituto de Geociências, 2007 The extinctions and their relationships with the biological evolution allow the changes in the biota patterns through the geological time. In this study is presented a synthesis of the extinction events registered in the paleontological data and their ...
Ibsen de Gusmão Câmara
doaj
Label-free single molecule imaging with numerical aperture-shaped interferometric scattering microscopy [PDF]
arXiv, 2016 Our ability to optically interrogate nanoscopic objects is controlled by the difference between their extinction cross sections and the diffraction limited area to which light can be confined in the far field. We show that a partially transmissive spatial mask placed near the back focal plane of a high numerical aperture microscope objective enhances ...
arxiv
Tuning Aggregation in Liquid‐Crystalline Squaraine Chromophores
Advanced Science, EarlyView.A novel squaraine dye (SQ) forming columnar liquid crystal (LC) phase is synthesized, whose aggregate state can be tuned without disturbing the columnar structures. The liquid crystallization not only offers a rich spectrum and tuning method of optical property but also a novel path for the prescriptive functionalization of LC SQ materials.
Tianyi Tan +12 more
wiley +1 more source
Advanced Science, EarlyView.The N1 peptide specifically targets neurons, enabling cytosolic delivery of fluorescent dyes and proteins for super‐resolution imaging and functional genetic modification. Abstract Efficient delivery of biomolecules into neurons has significant impacts on therapeutic applications in the central nervous system (CNS) and fundamental neuroscience research.
Xiaoqian Ge +16 more
wiley +1 more source