4 cats were given path-selection problems, with reference to the property of the correct path to lead to a visible goal. Choices were related first to the direction of the goal, then to the connectedness properties of the path if direction of the goal could not be used as a ...

Prokaryotic green algae (prochlorophytes), which contain chlorophylls a and b but no bilin pigments, may be phylogenetically related to ancestral chloroplasts if symbiogenesis occurred. They may be otherwise related to eukaryotic chlorophytes. They could have evolved from cyanophytes by loss of phycobilin and gain of chlorophyll b synthesis. These possibilities ...

Pediatric practice currently involves assisting patients and families in solving problems related to the process of divorce. The normal reactions and course of divorce adjustment have been thoroughly described, but specific guidelines are needed to guide treatment planning in related situations which may be highly problematic. Through review and synthesis ...

The problem of missed appointments in psychotherapy has received little empirical study. Consequently, this problem was studied in relation to several demographic and actuarial variables. Lower socio-economic status was found to be related to missed appointments and to premature termination. Missing appointments was also found to be related to dropping ...

The postinsertion problems of complete denture prostheses are closely related to accurate recording of maxillomandibular relationships. It is essential that these recordings be made with stable record bases; making the final impressions within the record bases prevents movement and tilting. Face-bow and centric relation records properly orient the casts in ...

Data relating to dystocia were obtained for 22% of beef herds in the Roma region of southern Queensland. In 1973 dystocia incidence in 23,129 maiden heifers was 12%; 4% of heifers and 7% of calves died. Thirty-five per cent of the 444 herds surveyed had more than a 10% incidence ...

Potentiation and additive effects of pesticides are considered major problems in the determination of safe daily intakes of these chemicals. Examples of potentiation between two organophosphates, such as ethyl-p-nitrophenyl benzenethionophosphonate (EPN) and malathion, delnav and malathion, and guthion and dipterex are considered. Although this type of potentiation could give rise ...

A commercial preparation of chorionic gonadotrophin inhibited gastric acid secretion induced by carbachol in rats. When the preparation was incubated for 10 min at 100 degrees C and pH 7, its gonadotrophic activity, as measured by a simple quantal assay based on the male toad spermiation response, was reduced by ...

In a fungus, Allomyces macrogynus Em., staining tests have revealed changes in the location of cytoplasmic basophilia following different phases of the developmental cycle. These variations in location were used to observe which fine structures correspond to basophile and non-basophile areas of the cytoplasm. Hyphae, gametangia, zygotes, and plants were ...

There is little exact information on the hereditary influences which are of greatest interest from the social and educational points of view. Many genes are involved in the origins of socially significant traits and there are usually many steps in the causal chain linking gene to trait. The value of ...