Congenitally athymic (nude) mice accepted for their lifetime intact skin grafts from distantly related mammals (cat, human) and birds (chicken). They also failed to immunologically reject skin grafts from reptiles (lizards) and amphibians (tree frog), although the skin in these grafts underwent varying degrees of disorganization. A definitive role for the thymic defect in this failure to reject...

Parapharyngodon duniae n. sp. (Nematoda: Pharyngodonidae) in the large intestine of the veined tree frog, Phrynohyas venulosa, from the Area de Conservación Guanacaste in northwestern Costa Rica is described and illustrated. Parapharyngodon duniae n. sp. represents the 34th species assigned to the genus, the 10th species from the Neotropical Realm, and only the third species to parasitize anura...

American tree frog Hypsiboas punctatus, an amphibian that exhibits natural fluorescence. Carlos Taboada et al. traced the frog’s fluorescence to a class of compounds called hyloins, and found that in low-light conditions the fluorescence substantially enhances the brightness of individuals and matches the sensitivity of amphibian night vision. See the article by Taboada et al. on pages 3672–367...

this paper presents a new modified shuffled frog leaping algorithm (msfla) applied to design simultaneous coordinated tuning of damping controllers to damp the power system low frequency oscillations. for this, a new frog leaping rule is proposed to improve the local exploration and performance of the original sfla and the genetic mutation operator is employed for new frog generation instead of...

Previous evidence indicated that frog virus 3 (FV3), an icosahedral DNA virus, replicates exclusively in the cytoplasm. However, data presented here demonstrate that FV3 does not replicate in UV-irradiated or enuleated chicken embryo or BSC-1 cells and that virus-specific DNA synthesis is not initiated in such cells. Primary transcription was not detected in infected enucleated cells. These res...

JAIRAJPURI, M. S. 1971. On Scutylenchus mamillatus lonolaimidae n.rank. Proc. Helminthol. Soc. Wash. 37: (Tobar-Jimenez, 1966) n.comb. Natl. Acad. Sci., India, 68-77. 40th Session, Feb. Vol. 18. Wu, L.-Y. 1969. Three new species of genus TylenSIDDIQI, M. R. 1970. On the plant-parasitic nematode genchorhynchus Cobb, 1913 (Tylenchidae: Nematoda)from era Merlinius gen.n. and Tylenchorhynchus Cobb ...

We study the recurrence property of one-per-site frog model FM(d,p) on a d-ary tree with drift parameter p∈[0,1], which determines bias frogs’ random walks. In this model, active frogs move toward root probability p or otherwise to uniformly chosen child vertex. Whenever site is visited for first time, new introduced at site. are interested in minimal pd so that recurrent. Using coupling argume...