Biomedical subjects

Bing Lin

Publications and source records attributed to Bing Lin.

5 recordsLinked to original sources

PubMed2007

Compressed oxygen in drug stability experiments.

A drug stability experiment accelerated by compressed oxygen was established. The stability of 10% ascorbic acid solution as a model was studied and the kinetic parameters were obtained with the newly established experimental method. Because ascorbic acid degrades under both anaerobic and aerobic conditions, the total rate constant k(total) can be expressed as: k(total)=k(anaerobic) + k(aerobic), where k(anaerobic) and k(aerobic) are the rate constants of anaerobic and aerobic degradations, respectively. The k(anaerobic) can be expressed as k(anaerobic) = A(anaerobic) x exp(-E(a,anaerobic)/RT) according to Arrhenius equation, and the k(aerobic) was found to be k(aerobic) = A(aerobic) x exp(-E(a,aerobic)/RT) x p(O2) in our study.

Ascorbic Acid↗

PubMed2006

A rationally designed agonist antibody fragment that functionally mimics thrombopoietin.

By using rational design, antibody fragments (Fabs) that mimic thrombopoietin (TPO) were created. A peptide with cMpl receptor-binding capability was grafted into different complementarity-determining regions of a fully human Fab scaffold. Functional presentation of the peptide was optimized by using phage display and cell-based panning. Select antibodies and fragments containing two grafted peptides were assayed for their ability to stimulate the cMpl receptor in vitro. Several candidates demonstrated agonist activity in an in vitro cMpl receptor signaling reporter assay, including Fab59, which was estimated to be equipotent to TPO. Fab59 additionally was able to effectively stimulate platelet production in normal mice. These rationally designed mimetic Fabs may provide a therapeutic intervention for thrombocytopenia while avoiding the potential generation of neutralizing antibodies to endogenous TPO. Furthermore, this study demonstrates a method by which short-lived linear peptides with binding activity may be converted to more stable and potent agonists capable of activating cell surface receptors.

Animals↗

PubMed2006

[Diagnosis and differential diagnosis of acute zonal occult outer retinopathy].

OBJECTIVE: To study the clinical manifestations of acute zonal occult outer retinopathy (AZOOR) and to differentiate it from other retinal diseases. METHODS: Six patients diagnosed AZOOR had complete eye examinations including fundus photography, fundus fluorescein angiography (FFA), electroretinography (ERG), visual evoked potentials and visual field examination. Medical consultation and neurological consultation were performed in those patients. All patients were followed up and the data were collected for analysis, discussion, diagnosis and differential diagnosis. RESULTS: Six patients (five female and one male) aged 26 - 42 years (mean 35 years) with AZOOR were followed up for 4 - 18 months [mean (7.5 +/- 3.2) months]. All of them were affected bilaterally and their visual acuity were slightly reduced except one eye was CF/40 cm. Half of them had photopsia. At least one eye of each patient had visual field defect or decreased sensitivity in local area or blind-spot enlargement. Biomicroscopic examination revealed vitreous cells in 10/12 eyes and anterior chamber inflammatory cells and keratic precipitate in 4/12 eyes. Minimal (10/12 eyes) or no (2/12 eyes) fundus changes were found in their initial examination. Funduscopic examination revealed yellow-white dots (4/12 eyes) and gray dots (6/12 eyes) at the posterior pole of deep retina or retinal pigment epithelium-Bruch membrane-choroid capillary complex layer. FFA showed depigmentation (2/12 eyes) or hyperfluorescein spots (10/12 eyes) that identical to the retinal lesions. In the follow-up examination, the visual acuity was reduced in one eye and visual field defect enlarged in both eyes of one patient; the number of retinal dots increased in one eye, decreased in one eye and extinguished in one eye. ERG or mERG revealed abnormal in all of their eyes with no changes in their follow-up examination. All of the initial diagnoses of six patients were not consistent with final diagnosis. CONCLUSIONS: AZOOR is a rare eye disease, usually occurs in young females, with the characteristics of photopsia, visual field defects, abnormal ERG and slight changes in the fundus. The differential diagnosis of this disease is relatively complicate and is easily to be misdiagnosed.

Acute Disease↗

PubMed2005

Light scattering by an infinite circular cylinder immersed in an absorbing medium.

Analytic solutions are developed for the single-scattering properties of an infinite dielectric cylinder embedded in an absorbing medium with normal incidence, which include extinction, scattering and absorption efficiencies, the scattering phase function, and the asymmetry factor. The extinction and scattering efficiencies are derived by the near-field solutions at the surface of the particle. The normalized scattering phase function is obtained by use of the far-field approximation. Computational results show that, although the absorbing medium significantly reduces the scattering efficiency, it has little effect on absorption efficiency. The absorbing medium can significantly change the conventional phase function. The absorbing medium also strongly affects the polarization of the scattered light. However, for large absorbing particles the degrees of polarization change little with the medium's absorption. This implies that, if the transmitting lights are strongly weakened inside the particle, the scattered polarized lights can be used to identify objects even when the absorption property of the host medium is unknown, which is important for both active and passive remote sensing.

Journal Article↗

PubMed2001

An Arabidopsis thaliana protein interacts with a movement protein of Turnip crinkle virus in yeast cells and in vitro.

Plant virus movement proteins bind host components to promote virus movement from initially infected cells to neighbouring cells. In this study, cDNA clones encoding p8 and p9, two small proteins required for the movement of Turnip crinkle virus, were used as 'bait' in a yeast two-hybrid system to screen an Arabidopsis thaliana cDNA library for interactive proteins. One A. thaliana clone was identified that encodes a protein, designated Atp8, which interacted with p8 in yeast cells and in vitro. The apparent full-length of Atp8 mRNA was sequenced and shown to encode a protein with two possible transmembrane helices, several potential phosphorylation sites and two 'RGD' sequences.

Amino Acid Sequence↗