PROTOPLASMIC RETRACTIONS IN BRYOPSIS PLUMOSA

Characterization of Cell Wall Polysaccharides of the Coencocytic Green Seaweed Bryopsis Plumosa (bryopsidaceae, Chlorophyta) from the Argentine Coast(1).

Bryopsis sp. from a restricted area of the rocky shore of Mar del Plata (Argentina) on the Atlantic coast was identified as Bryopsis plumosa (Hudson) C. Agardh (Bryopsidales, Chlorophyta) based on morphological characters and rbcL and tufA DNA barcodes. To analyze the cell wall polysaccharides of this seaweed, the major room temperature (B1) and 90°C (X1) water extracts were studied. By linkage...

Protoplasmic Potentials in Halicystis

The potential difference across the protoplasm of impaled cells of two American species of Halicystis is compared. The mean value for H. Osterhoutii is 68.4 mv.; that for H. ovalis is 79.7 mv., the sea water being positive to the sap in both. The higher potential of H. ovalis is apparently due to the higher concentration of KCl (0.3 M) in its vacuolar sap. When the KCl content of H. Osterhoutii...

Homomorphic Retractions in Semigroups

Retractions in Intersection Types

This paper deals with retraction intended as isomorphic embedding in intersection types building left and right inverses as terms of a λ-calculus with a ⊥ constant. The main result is a necessary and sufficient condition two strict intersection types must satisfy in order to assure the existence of two terms showing the first type to be a retract of the second one. Moreover, the characterisatio...

Retractions in orthopaedic research

OBJECTIVES Despite the fact that research fraud and misconduct are under scrutiny in the field of orthopaedic research, little systematic work has been done to uncover and characterise the underlying reasons for academic retractions in this field. The purpose of this study was to determine the rate of retractions and identify the reasons for retracted publications in the orthopaedic literature....