Analyses were made of chlorophyll a and b and fatty acids (18:3, 18:2, 18:1, 18:0, 16:2, 16:1, and 16:0) of greening and senescing leaf tissue. Those dark-grown tissues given a prior treatment of red, far red, or red followed by far red light showed similar increases in chlorophylls and linolenate (18:3) when exposed to continuous white light. In contrast, green barley (Hordeum vulgare L.) leav...

More than a decade ago it was recognized that ACTH and cortisone ameliorate some hemolytic anemias in man (1-6). Nevertheless, the mechanisms responsible for their therapeutic effect have not been elucidated. I t is generally believed that cortisone and its analogues benefit only those hemolytic anemias in which the red cells can be agglutinated by Coombs (antiglobulin) serum. Indeed, of the ma...

Verapamil and a number of other Ca2+antagonists were found to potentiate DMA damage induced by 4'-demethylepipodophyllotoxin-9-(4,6-O-ethylidene-|3-D-glucopyranoside (VP-16) in L1210 cells in vitro: The potentiating effect of verapamil on DNA single-strand breaks in vitro was concentration dependent, rele vant to clinically achieved levels of Ca2+antagonists, and showed good correlation with en...

BACKGROUND AND STUDY AIMS Five-aminolevulinic acid (5-ALA) is being increasingly used for photodynamic diagnosis and therapy of various types of tumors including brain, urologic, and other neoplasias. The use of 5-ALA to treat Barrett's carcinomas has been documented, but its clinical effectiveness for diagnosis of gastrointestinal tumors, particularly early cancers, remains unknown. PATIENTS...

New molecular line observations of the Bok globule Barnard 68 in HCO + irrefutably confirm the complex pattern of red and blue asymmetric line profiles seen across the face of the cloud in previous observations of CS. The new observations thus strengthen the previous interpretation that Barnard 68 is undergoing peculiar oscillations. Furthermore, the physical chemistry of B68 indicates that the...

Our understanding of how floral visitors integrate visual and olfactory cues when seeking food, and how background complexity affects flower detection is limited. Here, we aimed to understand the use of visual and olfactory information for bumblebees (Bombus terrestris terrestris L.) when seeking flowers in a visually complex background. To explore this issue, we first evaluated the effect of f...