Science.
Publisher:
[s.n.]. Washington, DC : American Association for the Advancement of Science (1991)
Frequency: Weekly (except last week in Dec.)
Country: United States
Language: English
Author(s):
American Association for the Advancement of Science.
Start Year:1880 -
ISSN:
0036-8075 (Print)
1095-9203 (Electronic)
0036-8075 (Linking)
1095-9203 (Electronic)
0036-8075 (Linking)
Impact Factor
56.9
2022
| NLM ID: | 0404511 |
| (DNLM): | S11420000(s) |
| (OCoLC): | 01644869 |
| Coden: | SCIEAS |
| LCCN: | 17024346 |
| Classification: | W1 SC653 |
Sex-Linkage of Glucose-6-Phosphate Dehydrogenase in the Horse and Donkey. Distinctly different electrophoretic patterns of red cell glucose-6-phosphate dehydrogenase were resolved from the hemolyzates of horse and donkey erythrocytes. Examination of their reciprocal hybrids, mules and hinnies, showed that the red cells of female mules and female hinnies contain both horse and donkey G-6-PD; the male mule with an X chromosome from its horse mother contained pure horse G-6-PD, whereas the male hinny with the donkey X chromosome contained pure donkey G-6-PD. These findings on the male reciprocal hybrids suggest X-linkage.
CHROMOSOME COMPLEMENT: DIFFERENCES BETWEEN EQUUS CABALLUS AND EQUUS PRZEWALSKII, POLIAKOFF. The chromosome number of the domestic horse is 2n = 64; different races have the same complement. The chromosomes of two Przewalski's horses (at Catskill Game Farm, New York), presumably ancestral wild horses from Mongolia, are identical: 2n = 66, with more acrocentric and fewer metacentric elements than the chromosomes of the domestic horse. This apparent difference in karyotype may help resolve the questions of "purity" in the relatively few remaining Przewalski's horses. Moreover, these findings are of interest in relation to the apparent fertility of hybrids between these species.
Myotonia in a horse. Congenital myotonia, similar to that which has been reported in humans and in goats, is here reported for the first time in another species. Evidence is given to show (i) that the myotonic phenomenon is present despite complete block of neuromuscular transmission; (ii) prior to injection of curare, synchronous activity of muscle fibers may result not only from ephaptic stimulation of neighboring fibers but also from reflex firing; and (iii) water deprivation does not relieve the myotonia.
Eastern equine encephalomyelitis vaccine prepared in cell cultures. Protection tests in guinea pigs indicate that vaccines prepared from virus propagated in chick embryo cell cultures are as effective as the purified whole chick embryo vaccines which are currently used for human immunization against eastern equine encephalomyelitis.
Influence of Anesthesia on Experimental Western Equine Encephalomyelitis. Anesthesia, by ether, is effective in the treatment of western equine encephalomyelitis in mice. Of mice treated with deep ether anesthesia soon after the intracerebral injection of western equine virus, only 58 per cent developed the disease as compared with 92.4 per cent of control animals. When anesthesia was delayed the approximate length of the incubation period, 60 per cent of the animals developed the disease as compared with 92.4 per cent of the controls. In addition, ether anesthesia delays the development of central nervous system symptoms not only when administered soon after the in...