(n.) Any American marsupial of the genera Didelphys and Chironectes. The common species of the United States is Didelphys Virginiana.
Example Sentences:
(1) The anatomic and functional development of the suprachiasmatic nuclei (SCN) was studied in the gray short-tailed opossum, Monodelphis domestica.
(2) Circular muscle strips from the opossum esophageal body obtained 3-5 cm above the esophagogastric junction were suspended in organ baths for measurement of isometric tension.
(3) Besides the relative abundance and the high infection rate of the opossum (62.5% by direct methods), its natural association with T. dimidiata was likewise demonstrated.
(4) Two of three noninoculated pouch mates acquired infections during the study based on examinations of feces and tissue sections of all eight opossums.
(5) EFS and VIP both caused relaxation of the resting tone in the opossum-isolated IAS smooth muscle strips.
(6) These findings are discussed with respect to similarities and differences between marsupial and eutherian females and between male and female gray opossums in the hormonal control of sexually dimorphic behavior and morphology.
(7) In the newborn opossum lung, examination of the air chambers with the scanning electron microscope permits the observation of several type II pulmonary epithelial cells in a single field.
(8) We recorded lower esophageal sphincter (LES) pressure and myoelectrical activity concurrently from the esophagus, LES, stomach, and proximal small intestine in unanesthetized opossums.
(9) The effects of intracellular pH on an inwardly rectifying K+ channel ("Kin channel") in opossum kidney (OK) cells were examined using the patch-clamp technique.
(10) Using the North American opossum, Didelphis virginiana, we have developed a new model for studying the effects of early fetal urinary obstruction on subsequent renal development.
(11) A study was designed to measure the Toxoplasma gondii-specific IgM and IgG antibody responses of opossums inoculated with tachyzoites of the temperature-sensitive mutant of T. gondii, ts-4, and to examine its persistence in the tissues.
(12) These results indicate that estrogen receptors are present in early development of the Monodelphis brain and may mark the beginning of a critical period for sexual differentiation of the opossum brain.
(13) The large liquor-contacting area in the pineal recess region, as well as the peculiar organization of its surface, suggest a complex interrelationship between the liquor and the pineal gland of the opossum.
(14) The findings suggested that a receptor resembling DA1-type peripheral receptor mediated the effects of dopamine on opossum oesophagus.
(15) Four young opossums seronegative for anti-Toxoplasma gondii IgM and IgG antibodies immediately after capture and 4 wk later were injected subcutaneously with 1.8 x 10(6) ts-4 tachyzoites; a fifth opossum (also seronegative) received an injection of saline only.
(16) The effects of ambient temperature and of sex on nest-building behavior were studied in a laboratory colony of gray short-tailed opossums, small, Brazilian marsupials.
(17) Opossums that ate the cowbirds had prepatent periods of 5 and 10 days and remained patent for at least 105 days.
(18) Volume regulatory responses of OK cells (a continuous epithelioid cell line from opossum kidney) are examined by electronic cell sizing and measurements of intracellular pH in cell suspensions.
(19) We studied the genesis of isolated LES relaxation in anesthetized opossums by observing the response of four components of the deglutition reflex (mylohyoid electrical activity, pharyngeal contraction, esophageal peristalsis, and LES relaxation) to pharyngeal tactile stimulation, electrical stimulation of superior laryngeal nerve (SLN) afferents or cervical vagal efferents, and to balloon distention of the esophageal body.
(20) In some opossums weak relaxations also occurred in the first few strips below the mucosal junction.
Rat
Definition:
(n.) One of several species of small rodents of the genus Mus and allied genera, larger than mice, that infest houses, stores, and ships, especially the Norway, or brown, rat (M. decumanus), the black rat (M. rattus), and the roof rat (M. Alexandrinus). These were introduced into America from the Old World.
(n.) A round and tapering mass of hair, or similar material, used by women to support the puffs and rolls of their natural hair.
(n.) One who deserts his party or associates; hence, in the trades, one who works for lower wages than those prescribed by a trades union.
(v. i.) In English politics, to desert one's party from interested motives; to forsake one's associates for one's own advantage; in the trades, to work for less wages, or on other conditions, than those established by a trades union.
(v. i.) To catch or kill rats.
Example Sentences:
(1) All rats were examined in the conscious, unrestrained state 12 wk after induction of diabetes or acidified saline (pH 4.5) injection.
(2) It was tested for recovery and separation from other selenium moieties present in urine using both in vivo-labeled rat urine and human urine spiked with unlabeled TMSe.
(3) It is supposed that delta-sleep peptide along with other oligopeptides is one of the factors determining individual animal resistance to emotional stress, which is supported by significant delta-sleep peptide increase in hypothalamus in stable rats.
(4) The microsomal preparations from untreated Syrian golden hamster livers exhibited higher activities of N-demethylation towards the macrolide antibiotics, erythromycin and troleandomycin, than those from untreated and phenobarbital-treated rats.
(5) Phospholipid methylation in human EGMs is distinctly different from that in rat EGMs (Hirata and Axelrod 1980) in that the human activity is not Mg++-dependent, and apparent methyltransferase I activity is located in the external membrane surface.
(6) Biochemical, immunocytochemical and histochemical methods were used to study the effect of chronic acetazolamide treatment on carbonic anhydrase (CA) isoenzymes in the rat kidney.
(7) In conclusion, in S-rats a glucose-stimulated insulin release is accompanied by an increase in IBF, but this is not observed in P-rats.
(8) Competition with the labelled 10B12 MAb for binding to the purified antigen was demonstrated in sera of tumor-bearing and immune rats.
(9) Nutritionally rehabilitated animals had similar numbers of nucleoli to control rats.
(10) This study examined the [3H]5-HT-releasing properties of 3,4-methylenedioxymethamphetamine (MDMA) and related agents, all of which cause significant release of [3H]5-HT from rat brain synaptosomes.
(11) Addition of phospholipase A2 from Vipera russelli venom led to a significant increase in the activity of guanylate cyclase in various rat organs.
(12) Spontaneous locomotor activity was lower in naloxone-infused rats on day 3 only.
(13) The LD50 of the following metal-binding chelating drugs, EDTA, diethylenetriaminepentaacetic acid (DTPA), hydroxyethylenediaminetriacetic acid (HEDTA), cyclohexanediaminotetraacetic acid (CDTA) and triethylenetetraminehexaacetic acid (TTHA) was evaluated in terms of mortality in rats after intraperitoneal administration and was found to be in the order: CDTA greater than EDTA greater than DTPA greater than TTHA greater than HEDTA.
(14) We have investigated a physiological role of endogenous insulin on exocrine pancreatic secretion stimulated by a liquid meal as well as exogenous secretin and cholecystokinin octapeptide (CCK-8) in conscious rats.
(15) The subcellular distribution of sialyltransferase and its product of action, sialic acid, was investigated in the undifferentiated cells of the rat intestinal crypts and compared with the pattern observed in the differentiated cells present in the surface epithelium.
(16) However, the groups often paused less and responded faster than individual rats working under identical conditions.
(17) After 55 days of unrestricted food availability the body weight of the neonatally deprived rats was approximately 15% lower than that of the controls.
(18) To examine the central nervous system regulation of duodenal bicarbonate secretion, an animal model was developed that allowed cerebroventricular and intravenous injections as well as collection of duodenal perfusates in awake, freely moving rats.
(19) In the present investigation we monitored the incorporation of [14C] from [U-14C]glucose into various rat brain glycolytic intermediates of conscious and pentobarbital-anesthetized animals.
(20) Gel filtration of the 40,000 rpm supernatant fraction of a homogenate of rat cerebral cortex on a Sepharose 6B column yielded two fractions: fraction II with the "Ca(2+) plus Mg(2+)-dependent" phosphodiesterase activity and fraction III containing its modulator.