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Biomedical subjects

Y F Yuan

Publications and source records attributed to Y F Yuan.

5 recordsLinked to original sources
PubMed2000

[Foundational study of subcritical water chromatography].

AIM: To study the subcritical water chromatographic discipline of compounds with medium and high polarity on the capillary and packed column. METHODS: A packed and capillary subcritical water chromatography-FID detection system was built up. Six alcohols were well separated on a C18 column and the influence of temperature on chromatographic behavior of alcohols with different polarity was studied. The influence of temperature and pressure on chromatographic behavior of benzoic acid and gensenoside Rg1 on a SE-54 capillary column were also studied. RESULTS: Increasing temperature resulted in the decreasing polarity of mobile phase, shortened retention times of components separated, narrowed peak shape and improved tailing as well. CONCLUSION: Temperature programming could be used successfully to separate compounds with various polarity selectively. Thermostable capillary column could enlarge the range of temperature even more.

Chromatography, Liquid↗
PubMed1995

Randomized study of chemoembolization as an adjuvant therapy for primary liver carcinoma after hepatectomy.

From April 1990 to December 1993, 140 patients were recruited to a randomized study to evaluate transcatheter hepatic arterial chemoembolization (TACE) as an adjuvant therapy for primary liver carcinoma after hepatectomy. This study investigated the principle, techniques and results of TACE. The results showed that the intrahepatic recurrence rate was 48.9% in the patients who underwent radical resection only, but only 21.3% in the patients who also underwent TACE 3-4 weeks after hepatectomy (P < 0.01). The 1-, 2-, 3-, and 4-year survival rates were 72.3%, 52.7%, 35.1%, and 35.1% respectively for the patients who underwent radical resection only, and were 97.9%, 85.5%, 69.5%, and 56.9% for the patients who also underwent TACE 3-4 weeks after radical resection (P < 0.001). The 1-, 2-, 3-, and 4-year survival rates were 38.9%, 0%, 0%, and 0% for the patients who underwent palliative resection only, and were 68.3%, 32.3%, 21.5%, and 21.5% respectively for the patients undergoing TACE 3-4 weeks after palliative hepatectomy (P < 0.001).

Adult↗
PubMed1990

Investigating the fairness of the National Resident Matching Program.

The National Resident Matching Program (NRMP) was established in the early 1950s to bring order and fairness to a previously chaotic application process for internship and residency positions. Over the years many reservations were raised about the fairness of the process, specifically, that hospital programs are doing better than students are (i.e., programs obtain preferred residents more often than students receive preferred programs). This paper presents an analysis of the results of the 1986 Match. The findings do not support the claim that the results of the Match are biased in a way that favors programs. Overall, the students' success was greater (i.e., receiving on average higher-ranked choices) than was the hospital programs' success. In fact, in 20 of 22 specialty programs, the students' degree of success was greater than or equal to the success of the programs. This finding raises the question of fairness toward programs rather than students. The authors analyze factors that affected both the hospitals' and the students' degrees of success in the 1986 Match and suggest strategies for improving the Match results.

Academic Medical Centers↗
PubMedDate not supplied

Use of silica gel with reversed-phase eluents for the separation and determination of alkaloids in Corydalis Yanhusuo W. T. Wang and its preparations.

An HPLC method using unmodified silica with reversed-phase eluents was developed for the determination of DL-tetrahydropalmatine in Corydalis Yanhusuo W. T. Wang and its set prescription preparations. The mobile phase was a mixture of methanol and 2 mmol/L phosphate buffer (75:25, v/v). The result was calculated by external standardization. The method is simple, rapid and precise, and could also be used for the separation and determination of alkaloids in other crude drugs and preparations.

Berberine Alkaloids↗