17 research outputs found
Stability of Underwater Periodic Locomotion
Most aquatic vertebrates swim by lateral flapping of their bodies and caudal
fins. While much effort has been devoted to understanding the flapping
kinematics and its influence on the swimming efficiency, little is known about
the stability (or lack of) of periodic swimming. It is believed that stability
limits maneuverability and body designs/flapping motions that are adapted for
stable swimming are not suitable for high maneuverability and vice versa. In
this paper, we consider a simplified model of a planar elliptic body undergoing
prescribed periodic heaving and pitching in potential flow. We show that
periodic locomotion can be achieved due to the resulting hydrodynamic forces,
and its value depends on several parameters including the aspect ratio of the
body, the amplitudes and phases of the prescribed flapping. We obtain
closed-form solutions for the locomotion and efficiency for small flapping
amplitudes, and numerical results for finite flapping amplitudes. We then study
the stability of the (finite amplitude flapping) periodic locomotion using
Floquet theory. We find that stability depends nonlinearly on all parameters.
Interesting trends of switching between stable and unstable motions emerge and
evolve as we continuously vary the parameter values. This suggests that, for
live organisms that control their flapping motion, maneuverability and
stability need not be thought of as disjoint properties, rather the organism
may manipulate its motion in favor of one or the other depending on the task at
hand.Comment: 15 pages, 15 figure
Viscous evolution of point vortex equilibria: The collinear state
When point vortex equilibria of the 2D Euler equations are used as initial
conditions for the corre- sponding Navier-Stokes equations (viscous), typically
an interesting dynamical process unfolds at short and intermediate time scales,
before the long time single peaked, self-similar Oseen vortex state dom-
inates. In this paper, we describe the viscous evolution of a collinear three
vortex structure that cor- responds to an inviscid point vortex fixed
equilibrium. Using a multi-Gaussian 'core-growth' type of model, we show that
the system immediately begins to rotate unsteadily, a mechanism we attribute to
a 'viscously induced' instability. We then examine in detail the qualitative
and quantitative evolution of the system as it evolves toward the long-time
asymptotic Lamb-Oseen state, showing the sequence of topological bifurcations
that occur both in a fixed reference frame, and in an appropriately chosen
rotating reference frame. The evolution of passive particles in this viscously
evolving flow is shown and interpreted in relation to these evolving streamline
patterns.Comment: 17 pages, 15 figure
Insights into symmetric and asymmetric vortex mergers using the core growth model
We revisit the two vortex merger problem (symmetric and asymmetric) for the
Navier-Stokes equations using the core growth model for vorticity evolution
coupled with the passive particle field and an appropriately chosen
time-dependent rotating reference frame. Using the combined tools of analyzing
the topology of the streamline patterns along with careful tracking of passive
fields, we highlight the key features of the stages of evolution of vortex
merger, pinpointing deficiencies in the low-dimensional model with respect to
similar experimental/numerical studies. The model, however, reveals a far
richer and delicate sequence of topological bifurcations than has previously
been discussed in the literature for this problem, and at the same time points
the way towards a method of improving the model.Comment: 17 pages, 16 figure
Competitive adsorption and desorption of three antibiotics in distinct soil aggregate size fractions
Multiple antibiotics that are used in veterinary medicine coexist in soils, but their interaction and the effects on adsorption and desorption in soils have not been extensively studied. In this study, using batch experiments, we evaluated the adsorption and desorption of sulfadiazine (SDZ), tetracycline (TC), and norfloxacin (NFX) using four different soil aggregate size fractions and discovered that: (1) TC had the highest adsorption (76–98 %) and the lowest desorption in each tested system, whereas SDZ showed opposite adsorption and desorption ability, (2) the highest adsorption and the lowest desorption of all three tested antibiotics were observed with soil macroaggregates (250–2000 µm) in all the cases; in contrast, opposite adsorption and desorption ability were observed for soil clay ( binary system (56–84 %) > ternary system (50–78 %); however, desorption were in the reverse order. The Freundlich equation fitting and Brunauer–Emmett–Teller (BET) analysis further demonstrated that the adsorption competition between the tested antibiotics depended mainly on the specific surface area of each soil aggregate size fractions and its chemical properties. In conclusion, soil macroaggregates play a key role in the retention of antibiotics in soils, and the coexistence of multiple antibiotics greatly increases leaching risk
Effect-Targeted Mapping of Potential Estrogenic Agonists and Antagonists in Wastewater via a Conformation-Specific Reporter-Mediated Biosensor
Wastewater treatment plants (WWTPs) are regarded as the
main sources
of estrogens that reach the aquatic environment. Hence, continuous
monitoring of potential estrogenic-active compounds by a biosensor
is an appealing approach. However, existing biosensors cannot simultaneously
distinguish and quantify estrogenic agonists and antagonists. To overcome
the challenge, we developed an estrogen receptor-based biosensor that
selectively screened estrogenic agonists and antagonists by introducing
rationally designed agonist/antagonist conformation-specific reporters.
The double functional conformation-specific reporters consist of a
Cy5.5-labeled streptavidin moiety and a peptide moiety, serving as
signal recognition and signal transduction elements. In addition,
the conformation recognition mechanism was further validated at the
molecular level through molecular docking. Based on the two-step “turn-off”
strategy, the biosensor exhibited remarkable sensitivity, detecting
17β-estradiol-binding activity equivalent (E2-BAE)
at 7 ng/L and 4-hydroxytamoxifen-binding activity equivalent (4-OHT-BAE)
at 91 ng/L. To validate its practicality, the biosensor was employed
in a case study involving wastewater samples from two full-scale WWTPs
across different treatment stages to map their estrogenic agonist
and antagonist binding activities. Comparison with the yeast two-hybrid
bioassay showed a strong liner relationship (r2 = 0.991, p < 0.0001), indicating the
excellent accuracy and reliability of this technology in real applications
Image3_A Wnt-related gene expression signature to improve the prediction of prognosis and tumor microenvironment in gastric cancer.JPEG
Background: Most gastric cancer (GC) patients were diagnosed in the advanced stages without obvious symptoms, which resulted in the increased risk of death. Although the combination therapies have showed survival benefit of patients, there is still urgent need to explore the underlying mechanisms of GC development and potential novel targets for clinical applications. Numerous studies have reported the upregulation of Wnt signaling pathway in human GC, which play important role during GC development and progression. However, the current understanding of Wnt signaling pathway is still limited due to its complexity and contradictory effect on different stages of GC tumor microenvironment.Method: We used The Cancer Genome Atlas (TCGA) and Gene Expression Omnibus (GEO) dataset to screen Wnt signaling pathway-associated genes by ssGSEA and correlation analysis. Three molecular subtypes were constructed based on a consistent clustering analysis. The key Wnt-related genes were screened through univariate cox analysis, lasso, and stepwise regression. In addition, the Gene Set Enrichment Analysis (GSEA) were performed to explore potential molecular pathways regulated by the Wnt-related gene signatures. ESTIMATE was utilized for evaluating the immune cell populations in GC tumor microenvironment.Results: Three molecular subtypes associated to Wnt were identified, and 7 key Wnt-related genes were screened to establish a predictive RiskScore model. These three molecular subtypes showed significant prognostic differences and distinct functional signaling pathways. We also found the downregulated immune checkpoint expression in the clust1 with good prognosis. The RiskScore model was successfully validated in GSE26942 dataset. Nomogram based on RiskScore and Gender had better prognostic predictive ability.Conclusion: In summary, our study showed that the Wnt-related genes could be used to predict prognosis of GC patients. The risk model we established showed high accuracy and survival prediction capability.</p