Molluscan cells: dissociation and reaggregation

Dissociation of the ovotestes of Helix pomatia requires the presence of carbohydrates as well as trypsin, but is independent of cation content. Dispersed cells obtained from the ovotestes reaggregate rapidly into histotypically organized tissue. The role of cellular adhesiveness is facilitated by centrifugation, but pseudopodial activity of the cells is suggested as another factor in reaggregation.     

Bohr Effect: Absence in a Molluscan Hemocyanin

The hemocyanin of the keyhole limpet, Diodora aspera, shows no Bohr effect within the pH range 6.88 to 7.84. At 10 degrees C the pressure of half-saturation is 5 mm-Hg of oxygen pressure. A moderately positive interaction occurs among the oxygen-combining sites during oxygenation. The heat of oxygenation is calculated to be approximately -12.6 kcal/mole of oxygen. The pH of normal blood of Diodora is lower than that of many other marine molluscs.     

Molluscan Faunal Changes around Bermuda

The recent appearance of large populations of certain adult marine mollusks in Bermuda shallows, unreported in previous surveys, suggests that an invasion is taking place, probably from Florida or the Bahamas, or from both. "Newcomers" grow to sizes larger than any known elsewhere, suggesting that the characteristically large sizes of some species in Bermuda reflect environmentalrather than genetic causes.     

Sedimentary phosphate method for estimating paleosalinities: a paleontological assumption

Paleosalinity values in certain rocks determined by the sedimentary phosphate method differ from salinity estimates based upon contained fossil assemblages, geochemical methods, and existing stratigraphic controls. Some anomalous values are related to the abundance of fossil organisms known to be concentrators of calcium phosphate. Because of the abundance and diversity of organisms which might introduce significant errors into paleosalinity estimates, the sedimentary phosphate method seemingly is of limited applicability.     

欧盟双壳贝类卫生管理体系研究

对欧盟双壳贝类卫生管理体系法规概况、贝类养殖监控体系的内容和特点进行了分析,提出了建立符合中国特色的贝类卫生管理体系的框架：建立包括原料标签在内的可追溯体系;建立中国特色的HACCP体系;建立出口示范基地。     

我国贝类出口遭遇的技术性贸易壁垒及应对措施

对我国贝类出口欧美遭遇的技术性贸易壁垒进行了分析,研究了欧美发达国家贝类卫生控制体系的现状,提出我国贝类应对技术性贸易壁垒的途径是建立出口贝类养殖加工及卫生控制标准化体系,从贝类养殖、加工到卫生控制3个层面采取组合控制措施,以突破欧美国家的"禁运"。