Results 241 to 250 of about 318,892 (304)

Cross‐Scale Hierarchical Targeted Delivery System Based on Small‐Scale Magnetic Robots

Advanced Robotics Research, EarlyView.
This article reviews a cross‐scale hierarchical targeted delivery system that integrates magnetic continuum robots and magnetic microrobots. By combining rapid long‐range navigation with precise microscale targeting, the system overcomes key limitations of single‐scale approaches.
Junjian Zhou, Zhiqiang Chen, Yuanbiao Ma, Zhiqiang Tang, Qianqian Wang   +4 more
wiley   +1 more source

Magnetic Micro‐ and Nanorobots for Precision Thrombolysis: Design Strategies and Translational Challenges

Advanced Robotics Research, EarlyView.
Micro‐ and nanorobots for targeted thrombolysis. This perspective elaborates on the clinical indication of blood clot disorders and current limitations for treatment. As a novel, alternative solution, micro‐ and nanorobots can be used to treat and break down thrombi.
Joshua M. Mesfin, Yimo Yan, Nikola Cesarovic, Simone Schuerle   +3 more
wiley   +1 more source

Chronic Hypoxia Disrupts Spermatogenesis Through ASXL2–EZH2–Mediated Microtubule Destabilization

Advanced Science, EarlyView.
This study reveals the mechanism by which chronic hypoxia impairs spermatogenesis via the ASXL2–EZH2 axis, hindering the transition of spermatids from round to elongated forms. Key findings reveal that under hypoxic conditions, downregulated ASXL2 expression reduces EZH2 binding to the CEP162 promoter, leading to decreased H3K27me3 modification and ...
Jun Yin, Mengjie Zhang, Wenying Liu, Wenlong Shen, Debao Li, Hongming Miao, Fang Deng, Gang Zhang, Yi Tian, Yi Zhang, Zhihu Zhao, Bing Ni   +11 more
wiley   +1 more source

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Astaxanthin increases choroidal blood flow velocity

Graefe's Archive for Clinical and Experimental Ophthalmology, 2011
Previous studies have reported that astaxanthin (AXT) has antioxidative and anti-inflammatory effects in addition to its ability to shorten blood transit times. As laser speckle flowgraphy (LSFG) can noninvasively visualize the hemodynamics of the choroidal circulation, we used the technique to evaluate whether continuous ingestion of 12 mg of AXT per ...
Michiyuki, Saito, Kazuhiko, Yoshida, Wataru, Saito, Akio, Fujiya, Kazuhiro, Ohgami, Nobuyoshi, Kitaichi, Hiroki, Tsukahara, Susumu, Ishida, Shigeaki, Ohno   +8 more
openaire   +2 more sources

Decorrelation-based blood flow velocity estimation: effect of spread of flow velocity, linear flow velocity gradients, and parabolic flow

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2002
In recent years, a new method to measure transverse blood flow, based on the decorrelation of the radio frequency (RF) signals has been developed. In this paper, we investigated the influence of nonuniform flow on the velocity estimation. The decorrelation characteristics of transverse blood flow using an intravascular ultrasound (IVUS) array catheter ...
Lupotti, F.A., Steen, A.F.W. van der, Mastik, F., Korte, C.L. de   +3 more
openaire   +4 more sources

Noninvasive Blood Flow Velocity Determination

2019 19th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering (ISEF), 2019
Electromagnetic flow meter method is proposed for non-invasive vascular measurements. A forward 3D electromagnetic, finite element method model is developed. The model employs the anatomically precise geometrical model of human leg with known blood flow speed in its vessels and tissue electrical conductivities.
Iliana Marinova, Valentin Mateev
openaire   +1 more source

Effects of blood donation on cerebral blood flow velocity

Transfusion, 1990
Eighteen healthy male blood donors, nine with hematocrit (Hct) of 0.40 to 0.45 (normal Hct) and nine with Hct of 0.49 to 0.52 (upper‐limit Hct), were monitored by continuous‐wave internal carotid Doppler sonography and hematologic tests for 28 days after blood donation, to ascertain whether and to what extent a single standard donation may modify the ...
C, Silvani, A, Zanella, F, Rossi, G, Cabrini, C, Ferrari, B, Cesana, G, Sirchia   +6 more
openaire   +2 more sources

Fetal Ophthalmic Artery Blood Flow Velocity Waveforms

Gynecologic and Obstetric Investigation, 1996
To evaluate alterations in vascular impedance of the fetal ophthalmic artery (OA) with advancing gestation.Color Doppler flow imaging and pulsed Doppler ultrasonographic assessment were performed on 28 normal fetuses, at gestational ages ranging from 21 to 40 weeks.
S, Aoki, T, Hata, Y, Ariyuki, D, Senoh, K, Makihara, K, Hata, M, Kitao   +6 more
openaire   +2 more sources