96.64% of the meiobenthos distributed in the top 0—5 cm of sediment, while 72.48% of nematode and 89.46% of copepoda were in the top 0—2 cm of the sediment.
Strain P5,capable of degrading phenol,was isolated from marine sediment and could use phenol as the sole carbon source for growth. It was identified as Candida sp.by its morphologic and physiological characteristics,especially by the analysis of 18S rDNA sequences.
The research is helpful to our understanding of effects of Vallisneria asiatica on the environment of water and the possible diurnal variation of phosphorus release in sediment.
crispus。 The root of P.crispus prcedominatiy takes up NH_4-N and PO_4-P from sediment,while shootsand leaves mainly take up NO_3-N from water under natural condition。
The annual fixation of BSi by diatom in ocean is from 5.60×109 to 7.84×109 t, about 97% of which is absorbed by diatom again before reaching seabed, and only 1.43×108—2.55×108 t (about 3%) is buried in sediment yearly. In this way, diatom plays an important role in the aquatic cycling of silicon.
The sediment of 4 well's cores of late Quaternary at the continental margin of East China Sea have been systimatically researched, and abundant fossils of diatom, 117 species and varieties in 33 genus, have been found.
This study examines the pollen evidence of vegetation change in the subtropical mountains in southeastern China based on three short sediment cores from the elongated peat-filled depressions in subalpine headwater zones from the Daiyun Mountain Range in central Fujian Province (approximately 25°40′N, 118°11′E).
/m~2 and 88.85 g/m~2 in autumn, respectively. The community structure of the snails was simple at heavy industrial pollution sites (D, F, I), but species diversity was seen at sediment heterogeneity sites ( E, H).
The average contents of chlorophyll a, b, c and phaepigment a in sediment at Zhanqiao station were 0.58μg/g, 0.47μg/g, 0.34μg/g, and 0.16μg/g, respectively.
The chlorophylls contents in sediment at Zhanshan station were the highest among the three stations, the average contents of chlorophylls a, b, c and phaepigment a being 0.72μg/g, 0.56μg/g, 0.36μg/g and 0.45μg/g, respectively.
Stresses of Eutrophic Lake Sediment on Submersed Macrophytes Ι.Effects of Acetic Acid on Germination and Bud Growth of Elodea nuttallii and Potamogeton crispus
The variables studied were transport of sand, underlying surface roughness, windblown sediment, wind-sand flow structure, soil mechanical composition and amount of wind erosion.
At a height of 0-20 cm, the height increased while the sediment discharge percent of sand flux decreased; there were significant differences in the sand flow formation under different land-use types.
At the same time, better correlative relationship between runoff and sediment production and rainfall and rainfall intensity were testified by multiple regression, but the correlation decreased gradually with the increase of canopy density of forest.
This paper describes an improved radioreceptor assay for opioid substances. By preparing with low speed centrifugation a sediment conta(?)ing opiate receptors from the homogenate of the anterior portion of the rat brain, and washing only once the binding complex with ice-cold Tris buffer, our assay is both quick and simple, without resort to elaborate apparatus. The ratio of receptor to nonspecific binding and assay sensitivity are both increased.The smallest amounts of morphine and enkephalin that ca...
This paper describes an improved radioreceptor assay for opioid substances. By preparing with low speed centrifugation a sediment containing opiate receptors from the homogenate of the anterior portion of the rat brain, and washing only once the binding complex with ice-cold Tris buffer, our assay is both quick and simple, without resort to elaborate apparatus. The ratio of receptor to nonspecific binding and assay sensitivity are both increased.The smallest amounts of morphine and enkephalin that can...
The work was conducted during the period of 1979.6-1980.8. The primary results obtained are as follows:1. There are a great number of Cr-tolerant microorganisms, particularly Cr-tolerant Bacteria (abb. CTB) and a higher ratio of CT/AA in every station of the surveyed zone. The amount of Colony-Forming Units (abb. CUF) of CTB (abb. CT) is 4.69??106-1.08??l0'CFU/g with an average of 3.52??107 CFU/g in sediment, and 6.69??104- 3.61 ??106 CFU/ml, with an average of 1.44??106 CFU/ml in water, respectively....