PubMed Health⌕ Search

Biomedical subjects

Y Qiang

Publications and source records attributed to Y Qiang.

7 recordsLinked to original sources
PubMed2006

Parity-violating electron scattering from 4He and the strange electric form factor of the nucleon.

We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from 4He at an average scattering angle = 5.7 degrees and a four-momentum transfer Q2 = 0.091 GeV2 . From these data, for the first time, the strange electric form factor of the nucleon G(E)s can be isolated. The measured asymmetry of A(PV) = (6.72 +/- 0.84(stat) +/- 0.21(syst) x 10(-6) yields a value of G(E)s = -0.038 +/- 0.042(stat) +/- 0.010(syst), consistent with zero.

Journal Article↗
PubMed2006

Imaging and nanomedicine for diagnosis and therapy in the central nervous system: report of the eleventh annual Blood-Brain Barrier Disruption Consortium meeting.

The blood-brain barrier (BBB) presents a major obstacle to the treatment of malignant brain tumors and other central nervous system (CNS) diseases. The Eleventh Annual Blood-Brain Barrier Disruption Consortium Meeting was convened to discuss recent advances and future directions in imaging and nanomedicine. Two sessions, one on Cell and Molecular Imaging in the CNS and another on Nanotechnology, Nanobiology, and Nanomedicine, were held March 17-18, 2005, in Portland, Ore. CNS imaging presentations targeted differentiating tumor, neural lesions, and necrosis from healthy brain tissue; methods of delivery of imaging agents across the BBB; and new iron oxide-based nanoparticle contrast agents for MR imaging. Nanobiology presentations covered the development of new nanotechnology and its use in imaging, diagnosis, and therapy in the CNS. Discussions at this meeting stressed the role of biotechnology in the convergence of CNS imaging and nanomedicine and are summarized in this article.

Blood-Brain Barrier↗
PubMed1999

[The problems and solutions of the leakage current checking in medical electrical equipments].

It is an important safety checking item to check leakage current of medical electric equipments. In the national standard, there are definite and strict stipulations for the leakage current-checking and the checkers. But this important checking is often misrepresented with general current measurements. So the checking is not up to the standard and the results are not dependable. In this paper, the special demands for the checking and the key technique of the checkers have been expounded in detail.

Electricity↗
PubMed1997

Studies of primary angle closure glaucoma in China.

The recent researches on primary angle closure glaucoma (PACG) in China were reviewed. The prevalence of PACG (0.41%) in chinese is between the Caucasian and Eskimos, and chronic type is the dominant type in PACG. However, with the economic development and medical care improvements, the prevalence condition of PACG may change; several researches discovered that the mechanism of PACG, especially the chronic type, is not only because of pupil-blocking but also closely related to the mechanism of crowding of peripheral iris and the anterior location of the ciliary body. We supposed that PACG can be divided into several subtypes based on this mechnism. Also, we believe that the use of ultrasound biomicroscopy (UBM) and ophthalmic laser in China has promoted the research of PACG and improved the level of prevention and treatment of PACG.

Asian People↗
PubMed1997

A model for blindness prevention.

OBJECTIVE: To introduce the work of the prevention and treatment of blindness of Zhongshan Ophthalmic Center, to find out the effective model of blindness prevention and treatment in China. METHOD: 1. To provide high quality clinical service to rural people. 2. To conduct epidemiological survey 3. To train local ophthalmic professionals 4. To promote international cooperation. RESULT: 40,000 outpatients cases, 4,500 cataract surgeries have been accomplished. Thousands cataract blind have been rehabilitated. 9 papers concerning epidemiological survey have been published. After the international training courses, 50 local ophthalmic workers have been trained and 4 cataract surgery rehabilitation centers have been founded. CONCLUSION: An effective model for blindness prevention and treatment should be based on clinical service, population based epidemiological survey and local ophthalmic professionals training. International cooperation is also an important promoter.

Blindness↗
PubMed1995

[Quantitative analysis of serum hyaluronic acid and its application in liver disease].

Determination of serum hyaluronic acid (HA) in 191 normal subjects and 170 cases with liver disease found, due to containing a large amount of HA in fetal tissues, serum HA level in neonates still remained relatively high, and decreased gradually with their growth and approximated to adult level by the age of six months. Serum HA level increased significantly in patients with liver disease and showed no change in chronic persistent hepatitis. The gradient trend of increasing serum HA levels in patients with liver disease was acute hepatitis, chronic active hepatitis, and cirrhosis of liver. Determination of serum HA would be conducive to evaluation of the degree of liver injuries and could be used in large-scale epidemiological studies and screening-up with low-cost and quickness, with an upper reference value of 117 micrograms/L.

Adolescent↗