Concentration and distribution of selenium have been investigated in 12 kinds of seaweeds. It is found by determination that the selenium concentration in Phaeophyta is lower than in Chlorophyta and Rhodophyta. Selenium is predominately associated with amino acids and proteins.

The studies on glycosaminogiycans (GAG) from animals are carrying out extensively in the fields of biology.biochemistry and medicine. The methodology of GAG researches has been developed rapidly at present. The researches of GAG have just begun in China. Synthesizing a large number of references,this paper gives a brief introduction on the methods of extraction isolation and determination for GAG. And the latest methods and developing tendency are summarized as well.

Concentration,biochemical fractions of selenium have been investigated in the tissue organs of Blue mussel ( Mytilus edulis ) and Bay scallop ( Argopecten trradiaus ). It is found by determination that the selenium concentration in the mantle is higher than in other tissue organs of the Blue mussel and Bay scallop. Selenium is predominantely associated with amino acids and proteins. 64. 4 per cents to 70. 4 per cents of selenium was associated with insoluble proteins in the mantle of the Blue mussel and Bay scallop.

The effects of D-polymannuronic sulfate (DPS) on the norepinephrine (NA) or potassium chloride (KCL)-induced contraction of rat aortic rings were studied in this paper. The results showed that DPS at the final concentration of Img ? L-1 inhibited the contraction of aortic rings e-voked by NA or KCL and shift doseresponse curves for NA or KCL to the right in a non-parallel fa-sion and depressed their maximal response, implicating that DPS afforded the noncompetitive antagonism on contraction of rat aortic rings induced by NA or KCL. This finding suggested that DPS exerted an inhibitory action of potential-dependent calcium channel and that of receptor-operated calcium channel in vascular smooth muscle.

Objective To study the antifatigue effect of sea cucumber exstract.Methods According to the experimental methods of animal antifatigue, three doses of sea cucumber extract were applied to mice and their antifatigue effects were compared statistically.Result 300 mg?kg -1 ?d -1 sea cucumber extract could significantly prolong pole climbing time in mice, increase the reserves of liver glycogen and the content of blood glucose, decrease the contents of blood urea nitrogen (BUN) and blood lactic acid after strenuous exercise. Conclusion The preliminary study showed that the sea cucumber exstract has some antifatigue effects.

Fraction F3-3-3 of glycosaminoglycan was isolated from the leftover bits of Bay scallop Argopecten irradiaus . Infrared spectra of F3-3-3 was similar to that of heparin. Agarose gel electrophoresis of this fraction was performed in the system of barbital buffer (0. 06 mol/L,pH 8. 6). It was found that F3-3-3 showed single band in the electrophoresis. Compared with the agarose gel electrophoresis of standard glycosaminoglycan, such as heparin, hyaluronic acid and chondroitin 6-sulfate, it indicated that the relative migration rate of the fraction was close to that of heparin.

The glycosaminoglycan (GAG), isolated from Bay scallop Argopectenirradians, contains neutral monosaccharides besides hexosamines and hexosuronic acids. The monosaccharides obtained by alcoholysis with HCI-methylalcohol from the sample of GAG was trimethylsilanized with hexamethyldisilan and chlortrimethylsilan (HMDS ' TMCS = 2 : 1). And the trimethylsilyl derivatives of monosaccharides was determined by gas chro-matography. Compared the gas chromatography of the sample with that of standard monosaccharides, it was found that the GAG of the Bay scallop contains five neutral monosaccharides, viz glucose, galactose, xylose, fucose and rhamnose.

Objective To study the chemical constituents in the root of Baccaurea ramiflora.Methods Various chromatographic techniques were used to separate and purify the constituents.The structures of the compounds were elucidated by physicochemical properties and spectral analyses(UV,IR,ESI-MS,1H-NMR,13C-NMR,Dept90,Dept135,1H-1H COSY,1H-1H NOESY,HMQC,HMBC).Results A new compound was isolated and idertified.Conclusion This compound is a novel compound and named as epidihydrotutin.

The antihypertensive effect of marine sulfated polysaccharide AHD and its underlying mechanisms were studied in renovascular hypertensive rats (RHR) [two-kidney one clip,Goldblatt(2-K 1C)J. AHD were given orally at doses of 12.5, 25,50mg?kg～-1 once a day for five weeks,simultaneously wity the initiation of the establishment of renovascular hypertensive model. Serum nitric oxide(NO) was determined with NO kit,and plasma Angiotensin E (Ang Ⅱ ) and Eneothelin (ET) Were measured by radioimmumoassays. The results indicated that AHD decreased arteial blood pressure in a dose-dependent manner. Moreover, nitric oxide (NO) contents in serum were dose-dependently elevated,accompanied by dramatic reduction in Ang Ⅱ and ET contents. These findings suggested that AHD exerted its hypotensive activity by enhancing tye release of NO,followed by reduction in production of boty ANG Ⅱ and ET in vivo.

To comparative study the effect of polysaccharide sulfate (PSS) and amlodipine on renal hemodynamics in dogs. The kidney was denervated, PSS or amlodipine was injected through renal artery. Renal hemodynamic parameters, including mean arterial pressure, renal blood flow, glomerular filtration, urine flow, et al, were measured. Both PSS and amlodipine significantly increased renal blood flow and urine flow (P