Now showing items 61-70 of 84
The development of isolated blastomeres in Bithynia tentaculata (prosobranchia, gastropoda)
(Wiley Subscription Services, Inc., A Wiley Company, 1973-10)
The development of isolated blastomeres, separated at the first and second cleavage has been studied. After separation at the first cleavage, one half-embryo (CD) becomes swollen and balloon-like and develops adult organs ...
Dental and cranial variation in living Indriidae
(Springer-Verlag; Japan Monkey Centre, 1979-01)
Four species of Indriidae are extant in Madagascar. We have studied large samples of each of these to characterize dental and cranial variation, and to estimate the degree of sexual dimorphism in the dentition and cranium. ...
Activity of faecal fluid of a leaf-cutting ant toward plant cell wall polysaccharides
(Elsevier, 1975-12)
The faecal fluid of the leaf-cutting ant, Atta colombica tonsipes, has been shown to contain enzymes active in the degradation of pectin, sodium polypectate, xylan, and carboxymethylcellulose. In addition, glycosidase ...
Patterns of fuel utilization by the thoracic muscles of adult worker ants. The use of lipid by a hymenopteran
(Elsevier, 1979)
1. 1. Patterns of fuel utilization in the thoracic muscles of three species of ants have been established.2. 2. The thoracic muscles of Formica ulkei exhibit a typical Hymenopteran metabolic organization, relying exclusively ...
The human mandible: Lever, link, or both?
(Wiley Subscription Services, Inc., A Wiley Company, 1979-07)
Hylander ('78) recently published important new data on bite force in humans, and showed that the human mandible cannot function purely as a link during incisal biting. He concluded instead that the mandible acts as a ...
The gladiator frogs of Middle America and Colombia -- a reevaluation of their systematics (Anura: Hylidae)
(University of Michigan Museum of Zoology, 1979)
An algebraic analysis of cladistic characters
(Elsevier, 1976-10)
Cladistic characters are used by many numerical axonomists in the estimation of evolutionary history. We make use of semilattice theory to give an algebraic formulation of the ideas involved in this process and to give ...
The biochemical basis for the symbiosis between the ant, Atta colombica tonsipes, and its food fungus
(Elsevier, 1970-01)
The fungus cultured by the attine ant, Atta colombica tonsipes, is deficient in the full complement of proteolytic enzymes necessary to grow well on substrates in which the nitrogen is present predominantly as protein. The ...
Seasonal acclimatization to temperature in cardueline finches
(Springer-Verlag, 1976-01)
1. Seasonal variation in metabolism and insulation was measured throughout the year in American goldfinches ( Spinus tristis ) and during winter in pine siskins ( S. pinus ).