Your browser doesn't support javascript.
Mostrar: 20 | 50 | 100
Resultados 1 - 4 de 4
Mais filtros

Base de dados
Intervalo de ano de publicação
Zhongguo Ying Yong Sheng Li Xue Za Zhi ; 35(4): 381-384, 2019 Jul 28.
Artigo em Chinês | MEDLINE | ID: mdl-31701728


OBJECTIVE: To investigate the expression of 2-type small conductance-Ca2+-activating-K+ (SK2) channel protein in hypertensive rat myocardial cells. METHODS: Twelve healthy adult male SD rats were randomly divided into control group (n=5) and experimental group (n=7). The rats of experimental group were injected intraperitoneally with N'-nitro-L-arginine (L-NNA 15 mg/(kg·d))while the rats of control group were injected intraperitoneally with isometrical normal saline(15 ml/(kg·d )). The body weight, blood pressure and electrocardiogram of the rats were measured every week. After 4 weeks, the rats were sacrificed to obtain hearts, and the expression of SK2 channel protein in myocardium was detected by Western blot. RESULTS: After 4 weeks of administration, compared with the control group, the blood pressure in the experimental group was significantly elevated (P<0.05), QRS duration and R-R interval were prolonged, and the expressions of SK2 channel in the atrial and ventricular tissue of the experimental group were significantly higher than those in the control group (1.12±0.18,1.64±0.26, P < 0.05). CONCLUSION: The expressions of atrial and ventricular SK2 pathway are increased in hypertensive model rats. It may be one of the mechanism leading to arrhythmias in hypertensive model rats and can provide new ideas and strategies for the treatment and prognosis of hypertensive diseases.

Hipertensão/metabolismo , Miocárdio/metabolismo , Proteínas Serina-Treonina Quinases/metabolismo , Animais , Masculino , Distribuição Aleatória , Ratos , Ratos Sprague-Dawley
Sci Rep ; 7: 40099, 2017 01 10.
Artigo em Inglês | MEDLINE | ID: mdl-28071662


Recently, vortex beam carrying orbital angular momentum (OAM) for radio communications has attracted much attention for its potential of transmitting multiple signals simultaneously at the same frequency, which can be used to increase the channel capacity. However, most of the methods for getting multi-mode OAM radio beams are of complicated structure and very high cost. This paper provides an effective solution of generating dual circularly-polarized (CP) dual-mode OAM beams. The antenna consists of four dual-CP elements which are sequentially rotated 90 degrees in the clockwise direction. Different from all previous published research relating to OAM generation by phased arrays, the four elements are fed with the same phase for both left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP). The dual-mode operation for OAM is achieved through the opposite phase differences generated for LHCP and RHCP, when the dual-CP elements are sequentially rotated in the clockwise direction. The measured results coincide well with the simulated ones, which verified the effectiveness of the proposed design.

Rev Sci Instrum ; 87(8): 083108, 2016 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-27587101


A fiber-coupled displacement measuring interferometer capable of determining of the posture of a reflective surface of a measuring mirror is proposed. The newly constructed instrument combines fiber-coupled displacement and angular measurement technologies. The proposed interferometer has advantages of both the fiber-coupled and the spatially beam-separated interferometer. A portable dual-position sensitive detector (PSD)-based unit within this proposed interferometer measures the parallelism of the two source beams to guide the fiber-coupling adjustment. The portable dual PSD-based unit measures not only the pitch and yaw of the retro-reflector but also measures the posture of the reflective surface. The experimental results of displacement calibration show that the deviations between the proposed interferometer and a reference one, Agilent 5530, at two different common beam directions are both less than ±35 nm, thus verifying the effectiveness of the beam parallelism measurement. The experimental results of angular calibration show that deviations of pitch and yaw with the auto-collimator (as a reference) are less than ±2 arc sec, thus proving the proposed interferometer's effectiveness for determination of the posture of a reflective surface.

Appl Opt ; 53(24): 5448-52, 2014 Aug 20.
Artigo em Inglês | MEDLINE | ID: mdl-25321118


A balanced plane-mirror heterodyne interferometer with a polarizing beam splitter used to recombine the reference and measurement beams is proposed to reduce periodic nonlinearity and to eliminate thermal error. Experimental results indicated that the periodic error due to ghost reflection was kept within ±36 pm, and the interferometer proposed was immune from thermal error.